Index: head/sys/amd64/amd64/elf_machdep.c =================================================================== --- head/sys/amd64/amd64/elf_machdep.c (revision 362943) +++ head/sys/amd64/amd64/elf_machdep.c (revision 362944) @@ -1,338 +1,353 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright 1996-1998 John D. Polstra. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct sysentvec elf64_freebsd_sysvec = { .sv_size = SYS_MAXSYSCALL, .sv_table = sysent, .sv_errsize = 0, .sv_errtbl = NULL, .sv_transtrap = NULL, .sv_fixup = __elfN(freebsd_fixup), .sv_sendsig = sendsig, .sv_sigcode = sigcode, .sv_szsigcode = &szsigcode, .sv_name = "FreeBSD ELF64", .sv_coredump = __elfN(coredump), .sv_imgact_try = NULL, .sv_minsigstksz = MINSIGSTKSZ, .sv_minuser = VM_MIN_ADDRESS, .sv_maxuser = VM_MAXUSER_ADDRESS, .sv_usrstack = USRSTACK, .sv_psstrings = PS_STRINGS, .sv_stackprot = VM_PROT_ALL, .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs), .sv_copyout_strings = exec_copyout_strings, .sv_setregs = exec_setregs, .sv_fixlimit = NULL, .sv_maxssiz = NULL, .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_LP64 | SV_SHP | SV_TIMEKEEP, .sv_set_syscall_retval = cpu_set_syscall_retval, .sv_fetch_syscall_args = cpu_fetch_syscall_args, .sv_syscallnames = syscallnames, .sv_shared_page_base = SHAREDPAGE, .sv_shared_page_len = PAGE_SIZE, .sv_schedtail = NULL, .sv_thread_detach = NULL, .sv_trap = NULL, .sv_stackgap = elf64_stackgap, }; INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); void amd64_lower_shared_page(struct sysentvec *sv) { if (hw_lower_amd64_sharedpage != 0) { sv->sv_maxuser -= PAGE_SIZE; sv->sv_shared_page_base -= PAGE_SIZE; sv->sv_usrstack -= PAGE_SIZE; sv->sv_psstrings -= PAGE_SIZE; } } /* * Do this fixup before INIT_SYSENTVEC (SI_ORDER_ANY) because the latter * uses the value of sv_shared_page_base. */ SYSINIT(elf64_sysvec_fixup, SI_SUB_EXEC, SI_ORDER_FIRST, (sysinit_cfunc_t) amd64_lower_shared_page, &elf64_freebsd_sysvec); static Elf64_Brandinfo freebsd_brand_info = { .brand = ELFOSABI_FREEBSD, .machine = EM_X86_64, .compat_3_brand = "FreeBSD", .emul_path = NULL, .interp_path = "/libexec/ld-elf.so.1", .sysvec = &elf64_freebsd_sysvec, .interp_newpath = NULL, .brand_note = &elf64_freebsd_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, (sysinit_cfunc_t) elf64_insert_brand_entry, &freebsd_brand_info); static Elf64_Brandinfo freebsd_brand_oinfo = { .brand = ELFOSABI_FREEBSD, .machine = EM_X86_64, .compat_3_brand = "FreeBSD", .emul_path = NULL, .interp_path = "/usr/libexec/ld-elf.so.1", .sysvec = &elf64_freebsd_sysvec, .interp_newpath = NULL, .brand_note = &elf64_freebsd_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, (sysinit_cfunc_t) elf64_insert_brand_entry, &freebsd_brand_oinfo); static Elf64_Brandinfo kfreebsd_brand_info = { .brand = ELFOSABI_FREEBSD, .machine = EM_X86_64, .compat_3_brand = "FreeBSD", .emul_path = NULL, .interp_path = "/lib/ld-kfreebsd-x86-64.so.1", .sysvec = &elf64_freebsd_sysvec, .interp_newpath = NULL, .brand_note = &elf64_kfreebsd_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY }; SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY, (sysinit_cfunc_t) elf64_insert_brand_entry, &kfreebsd_brand_info); void elf64_dump_thread(struct thread *td, void *dst, size_t *off) { void *buf; size_t len; len = 0; if (use_xsave) { if (dst != NULL) { fpugetregs(td); len += elf64_populate_note(NT_X86_XSTATE, get_pcb_user_save_td(td), dst, cpu_max_ext_state_size, &buf); *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = xsave_mask; } else len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL, cpu_max_ext_state_size, NULL); } *off = len; } bool elf_is_ifunc_reloc(Elf_Size r_info) { return (ELF_R_TYPE(r_info) == R_X86_64_IRELATIVE); } /* Process one elf relocation with addend. */ static int elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, - int type, elf_lookup_fn lookup) + int type, bool late_ifunc, elf_lookup_fn lookup) { Elf64_Addr *where, val; Elf32_Addr *where32, val32; Elf_Addr addr; Elf_Addr addend; Elf_Size rtype, symidx; const Elf_Rel *rel; const Elf_Rela *rela; int error; switch (type) { case ELF_RELOC_REL: rel = (const Elf_Rel *)data; where = (Elf_Addr *) (relocbase + rel->r_offset); rtype = ELF_R_TYPE(rel->r_info); symidx = ELF_R_SYM(rel->r_info); /* Addend is 32 bit on 32 bit relocs */ switch (rtype) { case R_X86_64_PC32: case R_X86_64_32S: case R_X86_64_PLT32: addend = *(Elf32_Addr *)where; break; default: addend = *where; break; } break; case ELF_RELOC_RELA: rela = (const Elf_Rela *)data; where = (Elf_Addr *) (relocbase + rela->r_offset); addend = rela->r_addend; rtype = ELF_R_TYPE(rela->r_info); symidx = ELF_R_SYM(rela->r_info); break; default: panic("unknown reloc type %d\n", type); } + if (late_ifunc) { + KASSERT(type == ELF_RELOC_RELA, + ("Only RELA ifunc relocations are supported")); + if (rtype != R_X86_64_IRELATIVE) + return (0); + } + switch (rtype) { case R_X86_64_NONE: /* none */ break; case R_X86_64_64: /* S + A */ error = lookup(lf, symidx, 1, &addr); val = addr + addend; if (error != 0) return -1; if (*where != val) *where = val; break; case R_X86_64_PC32: /* S + A - P */ case R_X86_64_PLT32: /* L + A - P, L is PLT location for the symbol, which we treat as S */ error = lookup(lf, symidx, 1, &addr); where32 = (Elf32_Addr *)where; val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where); if (error != 0) return -1; if (*where32 != val32) *where32 = val32; break; case R_X86_64_32S: /* S + A sign extend */ error = lookup(lf, symidx, 1, &addr); val32 = (Elf32_Addr)(addr + addend); where32 = (Elf32_Addr *)where; if (error != 0) return -1; if (*where32 != val32) *where32 = val32; break; case R_X86_64_COPY: /* none */ /* * There shouldn't be copy relocations in kernel * objects. */ printf("kldload: unexpected R_COPY relocation\n"); return (-1); case R_X86_64_GLOB_DAT: /* S */ case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ error = lookup(lf, symidx, 1, &addr); if (error != 0) return -1; if (*where != addr) *where = addr; break; case R_X86_64_RELATIVE: /* B + A */ addr = elf_relocaddr(lf, relocbase + addend); val = addr; if (*where != val) *where = val; break; case R_X86_64_IRELATIVE: addr = relocbase + addend; val = ((Elf64_Addr (*)(void))addr)(); if (*where != val) *where = val; break; default: printf("kldload: unexpected relocation type %ld\n", rtype); return (-1); } return (0); } int elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, elf_lookup_fn lookup) { - return (elf_reloc_internal(lf, relocbase, data, type, lookup)); + return (elf_reloc_internal(lf, relocbase, data, type, false, lookup)); } int elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, elf_lookup_fn lookup) { - return (elf_reloc_internal(lf, relocbase, data, type, lookup)); + return (elf_reloc_internal(lf, relocbase, data, type, false, lookup)); +} + +int +elf_reloc_late(linker_file_t lf, Elf_Addr relocbase, const void *data, + int type, elf_lookup_fn lookup) +{ + + return (elf_reloc_internal(lf, relocbase, data, type, true, lookup)); } int elf_cpu_load_file(linker_file_t lf __unused) { return (0); } int elf_cpu_unload_file(linker_file_t lf __unused) { return (0); } int elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused) { return (0); } Index: head/sys/amd64/amd64/machdep.c =================================================================== --- head/sys/amd64/amd64/machdep.c (revision 362943) +++ head/sys/amd64/amd64/machdep.c (revision 362944) @@ -1,2807 +1,2814 @@ /*- * SPDX-License-Identifier: BSD-4-Clause * * Copyright (c) 2003 Peter Wemm. * Copyright (c) 1992 Terrence R. Lambert. * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 */ #include __FBSDID("$FreeBSD$"); #include "opt_atpic.h" #include "opt_cpu.h" #include "opt_ddb.h" #include "opt_inet.h" #include "opt_isa.h" #include "opt_kstack_pages.h" #include "opt_maxmem.h" #include "opt_mp_watchdog.h" #include "opt_pci.h" #include "opt_platform.h" #include "opt_sched.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef SMP #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef DDB #ifndef KDB #error KDB must be enabled in order for DDB to work! #endif #include #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef SMP #include #endif #ifdef FDT #include #endif #ifdef DEV_ATPIC #include #else #include #endif #include #include #include /* Sanity check for __curthread() */ CTASSERT(offsetof(struct pcpu, pc_curthread) == 0); /* * The PTI trampoline stack needs enough space for a hardware trapframe and a * couple of scratch registers, as well as the trapframe left behind after an * iret fault. */ CTASSERT(PC_PTI_STACK_SZ * sizeof(register_t) >= 2 * sizeof(struct pti_frame) - offsetof(struct pti_frame, pti_rip)); extern u_int64_t hammer_time(u_int64_t, u_int64_t); #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) static void cpu_startup(void *); static void get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave, size_t xfpusave_len); static int set_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpustate, size_t xfpustate_len); SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); /* Preload data parse function */ static caddr_t native_parse_preload_data(u_int64_t); /* Native function to fetch and parse the e820 map */ static void native_parse_memmap(caddr_t, vm_paddr_t *, int *); /* Default init_ops implementation. */ struct init_ops init_ops = { .parse_preload_data = native_parse_preload_data, .early_clock_source_init = i8254_init, .early_delay = i8254_delay, .parse_memmap = native_parse_memmap, #ifdef SMP .mp_bootaddress = mp_bootaddress, .start_all_aps = native_start_all_aps, #endif #ifdef DEV_PCI .msi_init = msi_init, #endif }; /* * Physical address of the EFI System Table. Stashed from the metadata hints * passed into the kernel and used by the EFI code to call runtime services. */ vm_paddr_t efi_systbl_phys; /* Intel ICH registers */ #define ICH_PMBASE 0x400 #define ICH_SMI_EN ICH_PMBASE + 0x30 int _udatasel, _ucodesel, _ucode32sel, _ufssel, _ugssel; int cold = 1; long Maxmem = 0; long realmem = 0; struct kva_md_info kmi; static struct trapframe proc0_tf; struct region_descriptor r_idt; struct pcpu *__pcpu; struct pcpu temp_bsp_pcpu; struct mtx icu_lock; struct mem_range_softc mem_range_softc; struct mtx dt_lock; /* lock for GDT and LDT */ void (*vmm_resume_p)(void); static void cpu_startup(dummy) void *dummy; { uintmax_t memsize; char *sysenv; /* * On MacBooks, we need to disallow the legacy USB circuit to * generate an SMI# because this can cause several problems, * namely: incorrect CPU frequency detection and failure to * start the APs. * We do this by disabling a bit in the SMI_EN (SMI Control and * Enable register) of the Intel ICH LPC Interface Bridge. */ sysenv = kern_getenv("smbios.system.product"); if (sysenv != NULL) { if (strncmp(sysenv, "MacBook1,1", 10) == 0 || strncmp(sysenv, "MacBook3,1", 10) == 0 || strncmp(sysenv, "MacBook4,1", 10) == 0 || strncmp(sysenv, "MacBookPro1,1", 13) == 0 || strncmp(sysenv, "MacBookPro1,2", 13) == 0 || strncmp(sysenv, "MacBookPro3,1", 13) == 0 || strncmp(sysenv, "MacBookPro4,1", 13) == 0 || strncmp(sysenv, "Macmini1,1", 10) == 0) { if (bootverbose) printf("Disabling LEGACY_USB_EN bit on " "Intel ICH.\n"); outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8); } freeenv(sysenv); } /* * Good {morning,afternoon,evening,night}. */ startrtclock(); printcpuinfo(); /* * Display physical memory if SMBIOS reports reasonable amount. */ memsize = 0; sysenv = kern_getenv("smbios.memory.enabled"); if (sysenv != NULL) { memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10; freeenv(sysenv); } if (memsize < ptoa((uintmax_t)vm_free_count())) memsize = ptoa((uintmax_t)Maxmem); printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20); realmem = atop(memsize); /* * Display any holes after the first chunk of extended memory. */ if (bootverbose) { int indx; printf("Physical memory chunk(s):\n"); for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { vm_paddr_t size; size = phys_avail[indx + 1] - phys_avail[indx]; printf( "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", (uintmax_t)phys_avail[indx], (uintmax_t)phys_avail[indx + 1] - 1, (uintmax_t)size, (uintmax_t)size / PAGE_SIZE); } } vm_ksubmap_init(&kmi); printf("avail memory = %ju (%ju MB)\n", ptoa((uintmax_t)vm_free_count()), ptoa((uintmax_t)vm_free_count()) / 1048576); #ifdef DEV_PCI if (bootverbose && intel_graphics_stolen_base != 0) printf("intel stolen mem: base %#jx size %ju MB\n", (uintmax_t)intel_graphics_stolen_base, (uintmax_t)intel_graphics_stolen_size / 1024 / 1024); #endif /* * Set up buffers, so they can be used to read disk labels. */ bufinit(); vm_pager_bufferinit(); cpu_setregs(); } +static void +late_ifunc_resolve(void *dummy __unused) +{ + link_elf_late_ireloc(); +} +SYSINIT(late_ifunc_resolve, SI_SUB_CPU, SI_ORDER_ANY, late_ifunc_resolve, NULL); + /* * Send an interrupt to process. * * Stack is set up to allow sigcode stored * at top to call routine, followed by call * to sigreturn routine below. After sigreturn * resets the signal mask, the stack, and the * frame pointer, it returns to the user * specified pc, psl. */ void sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) { struct sigframe sf, *sfp; struct pcb *pcb; struct proc *p; struct thread *td; struct sigacts *psp; char *sp; struct trapframe *regs; char *xfpusave; size_t xfpusave_len; int sig; int oonstack; td = curthread; pcb = td->td_pcb; p = td->td_proc; PROC_LOCK_ASSERT(p, MA_OWNED); sig = ksi->ksi_signo; psp = p->p_sigacts; mtx_assert(&psp->ps_mtx, MA_OWNED); regs = td->td_frame; oonstack = sigonstack(regs->tf_rsp); if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) { xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu); xfpusave = __builtin_alloca(xfpusave_len); } else { xfpusave_len = 0; xfpusave = NULL; } /* Save user context. */ bzero(&sf, sizeof(sf)); sf.sf_uc.uc_sigmask = *mask; sf.sf_uc.uc_stack = td->td_sigstk; sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs)); sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */ get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len); fpstate_drop(td); update_pcb_bases(pcb); sf.sf_uc.uc_mcontext.mc_fsbase = pcb->pcb_fsbase; sf.sf_uc.uc_mcontext.mc_gsbase = pcb->pcb_gsbase; bzero(sf.sf_uc.uc_mcontext.mc_spare, sizeof(sf.sf_uc.uc_mcontext.mc_spare)); /* Allocate space for the signal handler context. */ if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && SIGISMEMBER(psp->ps_sigonstack, sig)) { sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size; #if defined(COMPAT_43) td->td_sigstk.ss_flags |= SS_ONSTACK; #endif } else sp = (char *)regs->tf_rsp - 128; if (xfpusave != NULL) { sp -= xfpusave_len; sp = (char *)((unsigned long)sp & ~0x3Ful); sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp; } sp -= sizeof(struct sigframe); /* Align to 16 bytes. */ sfp = (struct sigframe *)((unsigned long)sp & ~0xFul); /* Build the argument list for the signal handler. */ regs->tf_rdi = sig; /* arg 1 in %rdi */ regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */ bzero(&sf.sf_si, sizeof(sf.sf_si)); if (SIGISMEMBER(psp->ps_siginfo, sig)) { /* Signal handler installed with SA_SIGINFO. */ regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */ sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; /* Fill in POSIX parts */ sf.sf_si = ksi->ksi_info; sf.sf_si.si_signo = sig; /* maybe a translated signal */ regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */ } else { /* Old FreeBSD-style arguments. */ regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */ regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */ sf.sf_ahu.sf_handler = catcher; } mtx_unlock(&psp->ps_mtx); PROC_UNLOCK(p); /* * Copy the sigframe out to the user's stack. */ if (copyout(&sf, sfp, sizeof(*sfp)) != 0 || (xfpusave != NULL && copyout(xfpusave, (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len) != 0)) { #ifdef DEBUG printf("process %ld has trashed its stack\n", (long)p->p_pid); #endif PROC_LOCK(p); sigexit(td, SIGILL); } regs->tf_rsp = (long)sfp; regs->tf_rip = p->p_sysent->sv_sigcode_base; regs->tf_rflags &= ~(PSL_T | PSL_D); regs->tf_cs = _ucodesel; regs->tf_ds = _udatasel; regs->tf_ss = _udatasel; regs->tf_es = _udatasel; regs->tf_fs = _ufssel; regs->tf_gs = _ugssel; regs->tf_flags = TF_HASSEGS; PROC_LOCK(p); mtx_lock(&psp->ps_mtx); } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * state to gain improper privileges. * * MPSAFE */ int sys_sigreturn(td, uap) struct thread *td; struct sigreturn_args /* { const struct __ucontext *sigcntxp; } */ *uap; { ucontext_t uc; struct pcb *pcb; struct proc *p; struct trapframe *regs; ucontext_t *ucp; char *xfpustate; size_t xfpustate_len; long rflags; int cs, error, ret; ksiginfo_t ksi; pcb = td->td_pcb; p = td->td_proc; error = copyin(uap->sigcntxp, &uc, sizeof(uc)); if (error != 0) { uprintf("pid %d (%s): sigreturn copyin failed\n", p->p_pid, td->td_name); return (error); } ucp = &uc; if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) { uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid, td->td_name, ucp->uc_mcontext.mc_flags); return (EINVAL); } regs = td->td_frame; rflags = ucp->uc_mcontext.mc_rflags; /* * Don't allow users to change privileged or reserved flags. */ if (!EFL_SECURE(rflags, regs->tf_rflags)) { uprintf("pid %d (%s): sigreturn rflags = 0x%lx\n", p->p_pid, td->td_name, rflags); return (EINVAL); } /* * Don't allow users to load a valid privileged %cs. Let the * hardware check for invalid selectors, excess privilege in * other selectors, invalid %eip's and invalid %esp's. */ cs = ucp->uc_mcontext.mc_cs; if (!CS_SECURE(cs)) { uprintf("pid %d (%s): sigreturn cs = 0x%x\n", p->p_pid, td->td_name, cs); ksiginfo_init_trap(&ksi); ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_OBJERR; ksi.ksi_trapno = T_PROTFLT; ksi.ksi_addr = (void *)regs->tf_rip; trapsignal(td, &ksi); return (EINVAL); } if ((uc.uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) { xfpustate_len = uc.uc_mcontext.mc_xfpustate_len; if (xfpustate_len > cpu_max_ext_state_size - sizeof(struct savefpu)) { uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n", p->p_pid, td->td_name, xfpustate_len); return (EINVAL); } xfpustate = __builtin_alloca(xfpustate_len); error = copyin((const void *)uc.uc_mcontext.mc_xfpustate, xfpustate, xfpustate_len); if (error != 0) { uprintf( "pid %d (%s): sigreturn copying xfpustate failed\n", p->p_pid, td->td_name); return (error); } } else { xfpustate = NULL; xfpustate_len = 0; } ret = set_fpcontext(td, &ucp->uc_mcontext, xfpustate, xfpustate_len); if (ret != 0) { uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n", p->p_pid, td->td_name, ret); return (ret); } bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs)); update_pcb_bases(pcb); pcb->pcb_fsbase = ucp->uc_mcontext.mc_fsbase; pcb->pcb_gsbase = ucp->uc_mcontext.mc_gsbase; #if defined(COMPAT_43) if (ucp->uc_mcontext.mc_onstack & 1) td->td_sigstk.ss_flags |= SS_ONSTACK; else td->td_sigstk.ss_flags &= ~SS_ONSTACK; #endif kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0); return (EJUSTRETURN); } #ifdef COMPAT_FREEBSD4 int freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) { return sys_sigreturn(td, (struct sigreturn_args *)uap); } #endif /* * Reset registers to default values on exec. */ void exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack) { struct trapframe *regs; struct pcb *pcb; register_t saved_rflags; regs = td->td_frame; pcb = td->td_pcb; if (td->td_proc->p_md.md_ldt != NULL) user_ldt_free(td); update_pcb_bases(pcb); pcb->pcb_fsbase = 0; pcb->pcb_gsbase = 0; clear_pcb_flags(pcb, PCB_32BIT); pcb->pcb_initial_fpucw = __INITIAL_FPUCW__; saved_rflags = regs->tf_rflags & PSL_T; bzero((char *)regs, sizeof(struct trapframe)); regs->tf_rip = imgp->entry_addr; regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; regs->tf_rdi = stack; /* argv */ regs->tf_rflags = PSL_USER | saved_rflags; regs->tf_ss = _udatasel; regs->tf_cs = _ucodesel; regs->tf_ds = _udatasel; regs->tf_es = _udatasel; regs->tf_fs = _ufssel; regs->tf_gs = _ugssel; regs->tf_flags = TF_HASSEGS; /* * Reset the hardware debug registers if they were in use. * They won't have any meaning for the newly exec'd process. */ if (pcb->pcb_flags & PCB_DBREGS) { pcb->pcb_dr0 = 0; pcb->pcb_dr1 = 0; pcb->pcb_dr2 = 0; pcb->pcb_dr3 = 0; pcb->pcb_dr6 = 0; pcb->pcb_dr7 = 0; if (pcb == curpcb) { /* * Clear the debug registers on the running * CPU, otherwise they will end up affecting * the next process we switch to. */ reset_dbregs(); } clear_pcb_flags(pcb, PCB_DBREGS); } /* * Drop the FP state if we hold it, so that the process gets a * clean FP state if it uses the FPU again. */ fpstate_drop(td); } void cpu_setregs(void) { register_t cr0; cr0 = rcr0(); /* * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the * BSP. See the comments there about why we set them. */ cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM; load_cr0(cr0); } /* * Initialize amd64 and configure to run kernel */ /* * Initialize segments & interrupt table */ static struct gate_descriptor idt0[NIDT]; struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ static char dblfault_stack[PAGE_SIZE] __aligned(16); static char mce0_stack[PAGE_SIZE] __aligned(16); static char nmi0_stack[PAGE_SIZE] __aligned(16); static char dbg0_stack[PAGE_SIZE] __aligned(16); CTASSERT(sizeof(struct nmi_pcpu) == 16); /* * Software prototypes -- in more palatable form. * * Keep GUFS32, GUGS32, GUCODE32 and GUDATA at the same * slots as corresponding segments for i386 kernel. */ struct soft_segment_descriptor gdt_segs[] = { /* GNULL_SEL 0 Null Descriptor */ { .ssd_base = 0x0, .ssd_limit = 0x0, .ssd_type = 0, .ssd_dpl = 0, .ssd_p = 0, .ssd_long = 0, .ssd_def32 = 0, .ssd_gran = 0 }, /* GNULL2_SEL 1 Null Descriptor */ { .ssd_base = 0x0, .ssd_limit = 0x0, .ssd_type = 0, .ssd_dpl = 0, .ssd_p = 0, .ssd_long = 0, .ssd_def32 = 0, .ssd_gran = 0 }, /* GUFS32_SEL 2 32 bit %gs Descriptor for user */ { .ssd_base = 0x0, .ssd_limit = 0xfffff, .ssd_type = SDT_MEMRWA, .ssd_dpl = SEL_UPL, .ssd_p = 1, .ssd_long = 0, .ssd_def32 = 1, .ssd_gran = 1 }, /* GUGS32_SEL 3 32 bit %fs Descriptor for user */ { .ssd_base = 0x0, .ssd_limit = 0xfffff, .ssd_type = SDT_MEMRWA, .ssd_dpl = SEL_UPL, .ssd_p = 1, .ssd_long = 0, .ssd_def32 = 1, .ssd_gran = 1 }, /* GCODE_SEL 4 Code Descriptor for kernel */ { .ssd_base = 0x0, .ssd_limit = 0xfffff, .ssd_type = SDT_MEMERA, .ssd_dpl = SEL_KPL, .ssd_p = 1, .ssd_long = 1, .ssd_def32 = 0, .ssd_gran = 1 }, /* GDATA_SEL 5 Data Descriptor for kernel */ { .ssd_base = 0x0, .ssd_limit = 0xfffff, .ssd_type = SDT_MEMRWA, .ssd_dpl = SEL_KPL, .ssd_p = 1, .ssd_long = 1, .ssd_def32 = 0, .ssd_gran = 1 }, /* GUCODE32_SEL 6 32 bit Code Descriptor for user */ { .ssd_base = 0x0, .ssd_limit = 0xfffff, .ssd_type = SDT_MEMERA, .ssd_dpl = SEL_UPL, .ssd_p = 1, .ssd_long = 0, .ssd_def32 = 1, .ssd_gran = 1 }, /* GUDATA_SEL 7 32/64 bit Data Descriptor for user */ { .ssd_base = 0x0, .ssd_limit = 0xfffff, .ssd_type = SDT_MEMRWA, .ssd_dpl = SEL_UPL, .ssd_p = 1, .ssd_long = 0, .ssd_def32 = 1, .ssd_gran = 1 }, /* GUCODE_SEL 8 64 bit Code Descriptor for user */ { .ssd_base = 0x0, .ssd_limit = 0xfffff, .ssd_type = SDT_MEMERA, .ssd_dpl = SEL_UPL, .ssd_p = 1, .ssd_long = 1, .ssd_def32 = 0, .ssd_gran = 1 }, /* GPROC0_SEL 9 Proc 0 Tss Descriptor */ { .ssd_base = 0x0, .ssd_limit = sizeof(struct amd64tss) + IOPERM_BITMAP_SIZE - 1, .ssd_type = SDT_SYSTSS, .ssd_dpl = SEL_KPL, .ssd_p = 1, .ssd_long = 0, .ssd_def32 = 0, .ssd_gran = 0 }, /* Actually, the TSS is a system descriptor which is double size */ { .ssd_base = 0x0, .ssd_limit = 0x0, .ssd_type = 0, .ssd_dpl = 0, .ssd_p = 0, .ssd_long = 0, .ssd_def32 = 0, .ssd_gran = 0 }, /* GUSERLDT_SEL 11 LDT Descriptor */ { .ssd_base = 0x0, .ssd_limit = 0x0, .ssd_type = 0, .ssd_dpl = 0, .ssd_p = 0, .ssd_long = 0, .ssd_def32 = 0, .ssd_gran = 0 }, /* GUSERLDT_SEL 12 LDT Descriptor, double size */ { .ssd_base = 0x0, .ssd_limit = 0x0, .ssd_type = 0, .ssd_dpl = 0, .ssd_p = 0, .ssd_long = 0, .ssd_def32 = 0, .ssd_gran = 0 }, }; _Static_assert(nitems(gdt_segs) == NGDT, "Stale NGDT"); void setidt(int idx, inthand_t *func, int typ, int dpl, int ist) { struct gate_descriptor *ip; ip = idt + idx; ip->gd_looffset = (uintptr_t)func; ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL); ip->gd_ist = ist; ip->gd_xx = 0; ip->gd_type = typ; ip->gd_dpl = dpl; ip->gd_p = 1; ip->gd_hioffset = ((uintptr_t)func)>>16 ; } extern inthand_t IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), IDTVEC(xmm), IDTVEC(dblfault), IDTVEC(div_pti), IDTVEC(bpt_pti), IDTVEC(ofl_pti), IDTVEC(bnd_pti), IDTVEC(ill_pti), IDTVEC(dna_pti), IDTVEC(fpusegm_pti), IDTVEC(tss_pti), IDTVEC(missing_pti), IDTVEC(stk_pti), IDTVEC(prot_pti), IDTVEC(page_pti), IDTVEC(rsvd_pti), IDTVEC(fpu_pti), IDTVEC(align_pti), IDTVEC(xmm_pti), #ifdef KDTRACE_HOOKS IDTVEC(dtrace_ret), IDTVEC(dtrace_ret_pti), #endif #ifdef XENHVM IDTVEC(xen_intr_upcall), IDTVEC(xen_intr_upcall_pti), #endif IDTVEC(fast_syscall), IDTVEC(fast_syscall32), IDTVEC(fast_syscall_pti); #ifdef DDB /* * Display the index and function name of any IDT entries that don't use * the default 'rsvd' entry point. */ DB_SHOW_COMMAND(idt, db_show_idt) { struct gate_descriptor *ip; int idx; uintptr_t func; ip = idt; for (idx = 0; idx < NIDT && !db_pager_quit; idx++) { func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset); if (func != (uintptr_t)&IDTVEC(rsvd)) { db_printf("%3d\t", idx); db_printsym(func, DB_STGY_PROC); db_printf("\n"); } ip++; } } /* Show privileged registers. */ DB_SHOW_COMMAND(sysregs, db_show_sysregs) { struct { uint16_t limit; uint64_t base; } __packed idtr, gdtr; uint16_t ldt, tr; __asm __volatile("sidt %0" : "=m" (idtr)); db_printf("idtr\t0x%016lx/%04x\n", (u_long)idtr.base, (u_int)idtr.limit); __asm __volatile("sgdt %0" : "=m" (gdtr)); db_printf("gdtr\t0x%016lx/%04x\n", (u_long)gdtr.base, (u_int)gdtr.limit); __asm __volatile("sldt %0" : "=r" (ldt)); db_printf("ldtr\t0x%04x\n", ldt); __asm __volatile("str %0" : "=r" (tr)); db_printf("tr\t0x%04x\n", tr); db_printf("cr0\t0x%016lx\n", rcr0()); db_printf("cr2\t0x%016lx\n", rcr2()); db_printf("cr3\t0x%016lx\n", rcr3()); db_printf("cr4\t0x%016lx\n", rcr4()); if (rcr4() & CR4_XSAVE) db_printf("xcr0\t0x%016lx\n", rxcr(0)); db_printf("EFER\t0x%016lx\n", rdmsr(MSR_EFER)); if (cpu_feature2 & (CPUID2_VMX | CPUID2_SMX)) db_printf("FEATURES_CTL\t%016lx\n", rdmsr(MSR_IA32_FEATURE_CONTROL)); db_printf("DEBUG_CTL\t0x%016lx\n", rdmsr(MSR_DEBUGCTLMSR)); db_printf("PAT\t0x%016lx\n", rdmsr(MSR_PAT)); db_printf("GSBASE\t0x%016lx\n", rdmsr(MSR_GSBASE)); } DB_SHOW_COMMAND(dbregs, db_show_dbregs) { db_printf("dr0\t0x%016lx\n", rdr0()); db_printf("dr1\t0x%016lx\n", rdr1()); db_printf("dr2\t0x%016lx\n", rdr2()); db_printf("dr3\t0x%016lx\n", rdr3()); db_printf("dr6\t0x%016lx\n", rdr6()); db_printf("dr7\t0x%016lx\n", rdr7()); } #endif void sdtossd(sd, ssd) struct user_segment_descriptor *sd; struct soft_segment_descriptor *ssd; { ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; ssd->ssd_type = sd->sd_type; ssd->ssd_dpl = sd->sd_dpl; ssd->ssd_p = sd->sd_p; ssd->ssd_long = sd->sd_long; ssd->ssd_def32 = sd->sd_def32; ssd->ssd_gran = sd->sd_gran; } void ssdtosd(ssd, sd) struct soft_segment_descriptor *ssd; struct user_segment_descriptor *sd; { sd->sd_lobase = (ssd->ssd_base) & 0xffffff; sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff; sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; sd->sd_type = ssd->ssd_type; sd->sd_dpl = ssd->ssd_dpl; sd->sd_p = ssd->ssd_p; sd->sd_long = ssd->ssd_long; sd->sd_def32 = ssd->ssd_def32; sd->sd_gran = ssd->ssd_gran; } void ssdtosyssd(ssd, sd) struct soft_segment_descriptor *ssd; struct system_segment_descriptor *sd; { sd->sd_lobase = (ssd->ssd_base) & 0xffffff; sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful; sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; sd->sd_type = ssd->ssd_type; sd->sd_dpl = ssd->ssd_dpl; sd->sd_p = ssd->ssd_p; sd->sd_gran = ssd->ssd_gran; } #if !defined(DEV_ATPIC) && defined(DEV_ISA) #include #include /* * Return a bitmap of the current interrupt requests. This is 8259-specific * and is only suitable for use at probe time. * This is only here to pacify sio. It is NOT FATAL if this doesn't work. * It shouldn't be here. There should probably be an APIC centric * implementation in the apic driver code, if at all. */ intrmask_t isa_irq_pending(void) { u_char irr1; u_char irr2; irr1 = inb(IO_ICU1); irr2 = inb(IO_ICU2); return ((irr2 << 8) | irr1); } #endif u_int basemem; static int add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap, int *physmap_idxp) { int i, insert_idx, physmap_idx; physmap_idx = *physmap_idxp; if (length == 0) return (1); /* * Find insertion point while checking for overlap. Start off by * assuming the new entry will be added to the end. * * NB: physmap_idx points to the next free slot. */ insert_idx = physmap_idx; for (i = 0; i <= physmap_idx; i += 2) { if (base < physmap[i + 1]) { if (base + length <= physmap[i]) { insert_idx = i; break; } if (boothowto & RB_VERBOSE) printf( "Overlapping memory regions, ignoring second region\n"); return (1); } } /* See if we can prepend to the next entry. */ if (insert_idx <= physmap_idx && base + length == physmap[insert_idx]) { physmap[insert_idx] = base; return (1); } /* See if we can append to the previous entry. */ if (insert_idx > 0 && base == physmap[insert_idx - 1]) { physmap[insert_idx - 1] += length; return (1); } physmap_idx += 2; *physmap_idxp = physmap_idx; if (physmap_idx == PHYS_AVAIL_ENTRIES) { printf( "Too many segments in the physical address map, giving up\n"); return (0); } /* * Move the last 'N' entries down to make room for the new * entry if needed. */ for (i = (physmap_idx - 2); i > insert_idx; i -= 2) { physmap[i] = physmap[i - 2]; physmap[i + 1] = physmap[i - 1]; } /* Insert the new entry. */ physmap[insert_idx] = base; physmap[insert_idx + 1] = base + length; return (1); } void bios_add_smap_entries(struct bios_smap *smapbase, u_int32_t smapsize, vm_paddr_t *physmap, int *physmap_idx) { struct bios_smap *smap, *smapend; smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize); for (smap = smapbase; smap < smapend; smap++) { if (boothowto & RB_VERBOSE) printf("SMAP type=%02x base=%016lx len=%016lx\n", smap->type, smap->base, smap->length); if (smap->type != SMAP_TYPE_MEMORY) continue; if (!add_physmap_entry(smap->base, smap->length, physmap, physmap_idx)) break; } } static void add_efi_map_entries(struct efi_map_header *efihdr, vm_paddr_t *physmap, int *physmap_idx) { struct efi_md *map, *p; const char *type; size_t efisz; int ndesc, i; static const char *types[] = { "Reserved", "LoaderCode", "LoaderData", "BootServicesCode", "BootServicesData", "RuntimeServicesCode", "RuntimeServicesData", "ConventionalMemory", "UnusableMemory", "ACPIReclaimMemory", "ACPIMemoryNVS", "MemoryMappedIO", "MemoryMappedIOPortSpace", "PalCode", "PersistentMemory" }; /* * Memory map data provided by UEFI via the GetMemoryMap * Boot Services API. */ efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf; map = (struct efi_md *)((uint8_t *)efihdr + efisz); if (efihdr->descriptor_size == 0) return; ndesc = efihdr->memory_size / efihdr->descriptor_size; if (boothowto & RB_VERBOSE) printf("%23s %12s %12s %8s %4s\n", "Type", "Physical", "Virtual", "#Pages", "Attr"); for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p, efihdr->descriptor_size)) { if (boothowto & RB_VERBOSE) { if (p->md_type < nitems(types)) type = types[p->md_type]; else type = ""; printf("%23s %012lx %12p %08lx ", type, p->md_phys, p->md_virt, p->md_pages); if (p->md_attr & EFI_MD_ATTR_UC) printf("UC "); if (p->md_attr & EFI_MD_ATTR_WC) printf("WC "); if (p->md_attr & EFI_MD_ATTR_WT) printf("WT "); if (p->md_attr & EFI_MD_ATTR_WB) printf("WB "); if (p->md_attr & EFI_MD_ATTR_UCE) printf("UCE "); if (p->md_attr & EFI_MD_ATTR_WP) printf("WP "); if (p->md_attr & EFI_MD_ATTR_RP) printf("RP "); if (p->md_attr & EFI_MD_ATTR_XP) printf("XP "); if (p->md_attr & EFI_MD_ATTR_NV) printf("NV "); if (p->md_attr & EFI_MD_ATTR_MORE_RELIABLE) printf("MORE_RELIABLE "); if (p->md_attr & EFI_MD_ATTR_RO) printf("RO "); if (p->md_attr & EFI_MD_ATTR_RT) printf("RUNTIME"); printf("\n"); } switch (p->md_type) { case EFI_MD_TYPE_CODE: case EFI_MD_TYPE_DATA: case EFI_MD_TYPE_BS_CODE: case EFI_MD_TYPE_BS_DATA: case EFI_MD_TYPE_FREE: /* * We're allowed to use any entry with these types. */ break; default: continue; } if (!add_physmap_entry(p->md_phys, (p->md_pages * PAGE_SIZE), physmap, physmap_idx)) break; } } static char bootmethod[16] = ""; SYSCTL_STRING(_machdep, OID_AUTO, bootmethod, CTLFLAG_RD, bootmethod, 0, "System firmware boot method"); static void native_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx) { struct bios_smap *smap; struct efi_map_header *efihdr; u_int32_t size; /* * Memory map from INT 15:E820. * * subr_module.c says: * "Consumer may safely assume that size value precedes data." * ie: an int32_t immediately precedes smap. */ efihdr = (struct efi_map_header *)preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_EFI_MAP); smap = (struct bios_smap *)preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_SMAP); if (efihdr == NULL && smap == NULL) panic("No BIOS smap or EFI map info from loader!"); if (efihdr != NULL) { add_efi_map_entries(efihdr, physmap, physmap_idx); strlcpy(bootmethod, "UEFI", sizeof(bootmethod)); } else { size = *((u_int32_t *)smap - 1); bios_add_smap_entries(smap, size, physmap, physmap_idx); strlcpy(bootmethod, "BIOS", sizeof(bootmethod)); } } #define PAGES_PER_GB (1024 * 1024 * 1024 / PAGE_SIZE) /* * Populate the (physmap) array with base/bound pairs describing the * available physical memory in the system, then test this memory and * build the phys_avail array describing the actually-available memory. * * Total memory size may be set by the kernel environment variable * hw.physmem or the compile-time define MAXMEM. * * XXX first should be vm_paddr_t. */ static void getmemsize(caddr_t kmdp, u_int64_t first) { int i, physmap_idx, pa_indx, da_indx; vm_paddr_t pa, physmap[PHYS_AVAIL_ENTRIES]; u_long physmem_start, physmem_tunable, memtest; pt_entry_t *pte; quad_t dcons_addr, dcons_size; int page_counter; /* * Tell the physical memory allocator about pages used to store * the kernel and preloaded data. See kmem_bootstrap_free(). */ vm_phys_early_add_seg((vm_paddr_t)kernphys, trunc_page(first)); bzero(physmap, sizeof(physmap)); physmap_idx = 0; init_ops.parse_memmap(kmdp, physmap, &physmap_idx); physmap_idx -= 2; /* * Find the 'base memory' segment for SMP */ basemem = 0; for (i = 0; i <= physmap_idx; i += 2) { if (physmap[i] <= 0xA0000) { basemem = physmap[i + 1] / 1024; break; } } if (basemem == 0 || basemem > 640) { if (bootverbose) printf( "Memory map doesn't contain a basemem segment, faking it"); basemem = 640; } /* * Maxmem isn't the "maximum memory", it's one larger than the * highest page of the physical address space. It should be * called something like "Maxphyspage". We may adjust this * based on ``hw.physmem'' and the results of the memory test. */ Maxmem = atop(physmap[physmap_idx + 1]); #ifdef MAXMEM Maxmem = MAXMEM / 4; #endif if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable)) Maxmem = atop(physmem_tunable); /* * The boot memory test is disabled by default, as it takes a * significant amount of time on large-memory systems, and is * unfriendly to virtual machines as it unnecessarily touches all * pages. * * A general name is used as the code may be extended to support * additional tests beyond the current "page present" test. */ memtest = 0; TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest); /* * Don't allow MAXMEM or hw.physmem to extend the amount of memory * in the system. */ if (Maxmem > atop(physmap[physmap_idx + 1])) Maxmem = atop(physmap[physmap_idx + 1]); if (atop(physmap[physmap_idx + 1]) != Maxmem && (boothowto & RB_VERBOSE)) printf("Physical memory use set to %ldK\n", Maxmem * 4); /* * Make hole for "AP -> long mode" bootstrap code. The * mp_bootaddress vector is only available when the kernel * is configured to support APs and APs for the system start * in real mode mode (e.g. SMP bare metal). */ if (init_ops.mp_bootaddress) init_ops.mp_bootaddress(physmap, &physmap_idx); /* call pmap initialization to make new kernel address space */ pmap_bootstrap(&first); /* * Size up each available chunk of physical memory. * * XXX Some BIOSes corrupt low 64KB between suspend and resume. * By default, mask off the first 16 pages unless we appear to be * running in a VM. */ physmem_start = (vm_guest > VM_GUEST_NO ? 1 : 16) << PAGE_SHIFT; TUNABLE_ULONG_FETCH("hw.physmem.start", &physmem_start); if (physmap[0] < physmem_start) { if (physmem_start < PAGE_SIZE) physmap[0] = PAGE_SIZE; else if (physmem_start >= physmap[1]) physmap[0] = round_page(physmap[1] - PAGE_SIZE); else physmap[0] = round_page(physmem_start); } pa_indx = 0; da_indx = 1; phys_avail[pa_indx++] = physmap[0]; phys_avail[pa_indx] = physmap[0]; dump_avail[da_indx] = physmap[0]; pte = CMAP1; /* * Get dcons buffer address */ if (getenv_quad("dcons.addr", &dcons_addr) == 0 || getenv_quad("dcons.size", &dcons_size) == 0) dcons_addr = 0; /* * physmap is in bytes, so when converting to page boundaries, * round up the start address and round down the end address. */ page_counter = 0; if (memtest != 0) printf("Testing system memory"); for (i = 0; i <= physmap_idx; i += 2) { vm_paddr_t end; end = ptoa((vm_paddr_t)Maxmem); if (physmap[i + 1] < end) end = trunc_page(physmap[i + 1]); for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { int tmp, page_bad, full; int *ptr = (int *)CADDR1; full = FALSE; /* * block out kernel memory as not available. */ if (pa >= (vm_paddr_t)kernphys && pa < first) goto do_dump_avail; /* * block out dcons buffer */ if (dcons_addr > 0 && pa >= trunc_page(dcons_addr) && pa < dcons_addr + dcons_size) goto do_dump_avail; page_bad = FALSE; if (memtest == 0) goto skip_memtest; /* * Print a "." every GB to show we're making * progress. */ page_counter++; if ((page_counter % PAGES_PER_GB) == 0) printf("."); /* * map page into kernel: valid, read/write,non-cacheable */ *pte = pa | PG_V | PG_RW | PG_NC_PWT | PG_NC_PCD; invltlb(); tmp = *(int *)ptr; /* * Test for alternating 1's and 0's */ *(volatile int *)ptr = 0xaaaaaaaa; if (*(volatile int *)ptr != 0xaaaaaaaa) page_bad = TRUE; /* * Test for alternating 0's and 1's */ *(volatile int *)ptr = 0x55555555; if (*(volatile int *)ptr != 0x55555555) page_bad = TRUE; /* * Test for all 1's */ *(volatile int *)ptr = 0xffffffff; if (*(volatile int *)ptr != 0xffffffff) page_bad = TRUE; /* * Test for all 0's */ *(volatile int *)ptr = 0x0; if (*(volatile int *)ptr != 0x0) page_bad = TRUE; /* * Restore original value. */ *(int *)ptr = tmp; skip_memtest: /* * Adjust array of valid/good pages. */ if (page_bad == TRUE) continue; /* * If this good page is a continuation of the * previous set of good pages, then just increase * the end pointer. Otherwise start a new chunk. * Note that "end" points one higher than end, * making the range >= start and < end. * If we're also doing a speculative memory * test and we at or past the end, bump up Maxmem * so that we keep going. The first bad page * will terminate the loop. */ if (phys_avail[pa_indx] == pa) { phys_avail[pa_indx] += PAGE_SIZE; } else { pa_indx++; if (pa_indx == PHYS_AVAIL_ENTRIES) { printf( "Too many holes in the physical address space, giving up\n"); pa_indx--; full = TRUE; goto do_dump_avail; } phys_avail[pa_indx++] = pa; /* start */ phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ } physmem++; do_dump_avail: if (dump_avail[da_indx] == pa) { dump_avail[da_indx] += PAGE_SIZE; } else { da_indx++; if (da_indx == PHYS_AVAIL_ENTRIES) { da_indx--; goto do_next; } dump_avail[da_indx++] = pa; /* start */ dump_avail[da_indx] = pa + PAGE_SIZE; /* end */ } do_next: if (full) break; } } *pte = 0; invltlb(); if (memtest != 0) printf("\n"); /* * XXX * The last chunk must contain at least one page plus the message * buffer to avoid complicating other code (message buffer address * calculation, etc.). */ while (phys_avail[pa_indx - 1] + PAGE_SIZE + round_page(msgbufsize) >= phys_avail[pa_indx]) { physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); phys_avail[pa_indx--] = 0; phys_avail[pa_indx--] = 0; } Maxmem = atop(phys_avail[pa_indx]); /* Trim off space for the message buffer. */ phys_avail[pa_indx] -= round_page(msgbufsize); /* Map the message buffer. */ msgbufp = (struct msgbuf *)PHYS_TO_DMAP(phys_avail[pa_indx]); } static caddr_t native_parse_preload_data(u_int64_t modulep) { caddr_t kmdp; char *envp; #ifdef DDB vm_offset_t ksym_start; vm_offset_t ksym_end; #endif preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE); preload_bootstrap_relocate(KERNBASE); kmdp = preload_search_by_type("elf kernel"); if (kmdp == NULL) kmdp = preload_search_by_type("elf64 kernel"); boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *); if (envp != NULL) envp += KERNBASE; init_static_kenv(envp, 0); #ifdef DDB ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t); ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t); db_fetch_ksymtab(ksym_start, ksym_end, 0); #endif efi_systbl_phys = MD_FETCH(kmdp, MODINFOMD_FW_HANDLE, vm_paddr_t); return (kmdp); } static void amd64_kdb_init(void) { kdb_init(); #ifdef KDB if (boothowto & RB_KDB) kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger"); #endif } /* Set up the fast syscall stuff */ void amd64_conf_fast_syscall(void) { uint64_t msr; msr = rdmsr(MSR_EFER) | EFER_SCE; wrmsr(MSR_EFER, msr); wrmsr(MSR_LSTAR, pti ? (u_int64_t)IDTVEC(fast_syscall_pti) : (u_int64_t)IDTVEC(fast_syscall)); wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32)); msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) | ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48); wrmsr(MSR_STAR, msr); wrmsr(MSR_SF_MASK, PSL_NT | PSL_T | PSL_I | PSL_C | PSL_D | PSL_AC); } void amd64_bsp_pcpu_init1(struct pcpu *pc) { struct user_segment_descriptor *gdt; PCPU_SET(prvspace, pc); gdt = *PCPU_PTR(gdt); PCPU_SET(curthread, &thread0); PCPU_SET(tssp, PCPU_PTR(common_tss)); PCPU_SET(tss, (struct system_segment_descriptor *)&gdt[GPROC0_SEL]); PCPU_SET(ldt, (struct system_segment_descriptor *)&gdt[GUSERLDT_SEL]); PCPU_SET(fs32p, &gdt[GUFS32_SEL]); PCPU_SET(gs32p, &gdt[GUGS32_SEL]); } void amd64_bsp_pcpu_init2(uint64_t rsp0) { PCPU_SET(rsp0, rsp0); PCPU_SET(pti_rsp0, ((vm_offset_t)PCPU_PTR(pti_stack) + PC_PTI_STACK_SZ * sizeof(uint64_t)) & ~0xful); PCPU_SET(curpcb, thread0.td_pcb); } void amd64_bsp_ist_init(struct pcpu *pc) { struct nmi_pcpu *np; struct amd64tss *tssp; tssp = &pc->pc_common_tss; /* doublefault stack space, runs on ist1 */ np = ((struct nmi_pcpu *)&dblfault_stack[sizeof(dblfault_stack)]) - 1; np->np_pcpu = (register_t)pc; tssp->tss_ist1 = (long)np; /* * NMI stack, runs on ist2. The pcpu pointer is stored just * above the start of the ist2 stack. */ np = ((struct nmi_pcpu *)&nmi0_stack[sizeof(nmi0_stack)]) - 1; np->np_pcpu = (register_t)pc; tssp->tss_ist2 = (long)np; /* * MC# stack, runs on ist3. The pcpu pointer is stored just * above the start of the ist3 stack. */ np = ((struct nmi_pcpu *)&mce0_stack[sizeof(mce0_stack)]) - 1; np->np_pcpu = (register_t)pc; tssp->tss_ist3 = (long)np; /* * DB# stack, runs on ist4. */ np = ((struct nmi_pcpu *)&dbg0_stack[sizeof(dbg0_stack)]) - 1; np->np_pcpu = (register_t)pc; tssp->tss_ist4 = (long)np; } u_int64_t hammer_time(u_int64_t modulep, u_int64_t physfree) { caddr_t kmdp; int gsel_tss, x; struct pcpu *pc; struct xstate_hdr *xhdr; u_int64_t rsp0; char *env; struct user_segment_descriptor *gdt; struct region_descriptor r_gdt; size_t kstack0_sz; int late_console; TSRAW(&thread0, TS_ENTER, __func__, NULL); kmdp = init_ops.parse_preload_data(modulep); physfree += ucode_load_bsp(physfree + KERNBASE); physfree = roundup2(physfree, PAGE_SIZE); identify_cpu1(); identify_hypervisor(); identify_cpu_fixup_bsp(); identify_cpu2(); initializecpucache(); /* * Check for pti, pcid, and invpcid before ifuncs are * resolved, to correctly select the implementation for * pmap_activate_sw_mode(). */ pti = pti_get_default(); TUNABLE_INT_FETCH("vm.pmap.pti", &pti); TUNABLE_INT_FETCH("vm.pmap.pcid_enabled", &pmap_pcid_enabled); if ((cpu_feature2 & CPUID2_PCID) != 0 && pmap_pcid_enabled) { invpcid_works = (cpu_stdext_feature & CPUID_STDEXT_INVPCID) != 0; } else { pmap_pcid_enabled = 0; } link_elf_ireloc(kmdp); /* * This may be done better later if it gets more high level * components in it. If so just link td->td_proc here. */ proc_linkup0(&proc0, &thread0); /* Init basic tunables, hz etc */ init_param1(); thread0.td_kstack = physfree + KERNBASE; thread0.td_kstack_pages = kstack_pages; kstack0_sz = thread0.td_kstack_pages * PAGE_SIZE; bzero((void *)thread0.td_kstack, kstack0_sz); physfree += kstack0_sz; /* * Initialize enough of thread0 for delayed invalidation to * work very early. Rely on thread0.td_base_pri * zero-initialization, it is reset to PVM at proc0_init(). */ pmap_thread_init_invl_gen(&thread0); pc = &temp_bsp_pcpu; pcpu_init(pc, 0, sizeof(struct pcpu)); gdt = &temp_bsp_pcpu.pc_gdt[0]; /* * make gdt memory segments */ for (x = 0; x < NGDT; x++) { if (x != GPROC0_SEL && x != (GPROC0_SEL + 1) && x != GUSERLDT_SEL && x != (GUSERLDT_SEL) + 1) ssdtosd(&gdt_segs[x], &gdt[x]); } gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&pc->pc_common_tss; ssdtosyssd(&gdt_segs[GPROC0_SEL], (struct system_segment_descriptor *)&gdt[GPROC0_SEL]); r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; r_gdt.rd_base = (long)gdt; lgdt(&r_gdt); wrmsr(MSR_FSBASE, 0); /* User value */ wrmsr(MSR_GSBASE, (u_int64_t)pc); wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */ dpcpu_init((void *)(physfree + KERNBASE), 0); physfree += DPCPU_SIZE; amd64_bsp_pcpu_init1(pc); /* Non-late cninit() and printf() can be moved up to here. */ /* * Initialize mutexes. * * icu_lock: in order to allow an interrupt to occur in a critical * section, to set pcpu->ipending (etc...) properly, we * must be able to get the icu lock, so it can't be * under witness. */ mutex_init(); mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS); mtx_init(&dt_lock, "descriptor tables", NULL, MTX_DEF); /* exceptions */ for (x = 0; x < NIDT; x++) setidt(x, pti ? &IDTVEC(rsvd_pti) : &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_DE, pti ? &IDTVEC(div_pti) : &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 4); setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 2); setidt(IDT_BP, pti ? &IDTVEC(bpt_pti) : &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0); setidt(IDT_OF, pti ? &IDTVEC(ofl_pti) : &IDTVEC(ofl), SDT_SYSIGT, SEL_UPL, 0); setidt(IDT_BR, pti ? &IDTVEC(bnd_pti) : &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_UD, pti ? &IDTVEC(ill_pti) : &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_NM, pti ? &IDTVEC(dna_pti) : &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1); setidt(IDT_FPUGP, pti ? &IDTVEC(fpusegm_pti) : &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_TS, pti ? &IDTVEC(tss_pti) : &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_NP, pti ? &IDTVEC(missing_pti) : &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_SS, pti ? &IDTVEC(stk_pti) : &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_GP, pti ? &IDTVEC(prot_pti) : &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_PF, pti ? &IDTVEC(page_pti) : &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_MF, pti ? &IDTVEC(fpu_pti) : &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_AC, pti ? &IDTVEC(align_pti) : &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 3); setidt(IDT_XF, pti ? &IDTVEC(xmm_pti) : &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0); #ifdef KDTRACE_HOOKS setidt(IDT_DTRACE_RET, pti ? &IDTVEC(dtrace_ret_pti) : &IDTVEC(dtrace_ret), SDT_SYSIGT, SEL_UPL, 0); #endif #ifdef XENHVM setidt(IDT_EVTCHN, pti ? &IDTVEC(xen_intr_upcall_pti) : &IDTVEC(xen_intr_upcall), SDT_SYSIGT, SEL_KPL, 0); #endif r_idt.rd_limit = sizeof(idt0) - 1; r_idt.rd_base = (long) idt; lidt(&r_idt); /* * Initialize the clock before the console so that console * initialization can use DELAY(). */ clock_init(); /* * Use vt(4) by default for UEFI boot (during the sc(4)/vt(4) * transition). * Once bootblocks have updated, we can test directly for * efi_systbl != NULL here... */ if (preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_EFI_MAP) != NULL) vty_set_preferred(VTY_VT); TUNABLE_INT_FETCH("hw.ibrs_disable", &hw_ibrs_disable); TUNABLE_INT_FETCH("machdep.mitigations.ibrs.disable", &hw_ibrs_disable); TUNABLE_INT_FETCH("hw.spec_store_bypass_disable", &hw_ssb_disable); TUNABLE_INT_FETCH("machdep.mitigations.ssb.disable", &hw_ssb_disable); TUNABLE_INT_FETCH("machdep.syscall_ret_l1d_flush", &syscall_ret_l1d_flush_mode); TUNABLE_INT_FETCH("hw.mds_disable", &hw_mds_disable); TUNABLE_INT_FETCH("machdep.mitigations.mds.disable", &hw_mds_disable); TUNABLE_INT_FETCH("machdep.mitigations.taa.enable", &x86_taa_enable); TUNABLE_INT_FETCH("machdep.mitigations.rndgs.enable", &x86_rngds_mitg_enable); finishidentcpu(); /* Final stage of CPU initialization */ initializecpu(); /* Initialize CPU registers */ amd64_bsp_ist_init(pc); /* Set the IO permission bitmap (empty due to tss seg limit) */ pc->pc_common_tss.tss_iobase = sizeof(struct amd64tss) + IOPERM_BITMAP_SIZE; gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); ltr(gsel_tss); amd64_conf_fast_syscall(); /* * We initialize the PCB pointer early so that exception * handlers will work. Also set up td_critnest to short-cut * the page fault handler. */ cpu_max_ext_state_size = sizeof(struct savefpu); set_top_of_stack_td(&thread0); thread0.td_pcb = get_pcb_td(&thread0); thread0.td_critnest = 1; /* * The console and kdb should be initialized even earlier than here, * but some console drivers don't work until after getmemsize(). * Default to late console initialization to support these drivers. * This loses mainly printf()s in getmemsize() and early debugging. */ late_console = 1; TUNABLE_INT_FETCH("debug.late_console", &late_console); if (!late_console) { cninit(); amd64_kdb_init(); } getmemsize(kmdp, physfree); init_param2(physmem); /* now running on new page tables, configured,and u/iom is accessible */ #ifdef DEV_PCI /* This call might adjust phys_avail[]. */ pci_early_quirks(); #endif if (late_console) cninit(); #ifdef DEV_ISA #ifdef DEV_ATPIC elcr_probe(); atpic_startup(); #else /* Reset and mask the atpics and leave them shut down. */ atpic_reset(); /* * Point the ICU spurious interrupt vectors at the APIC spurious * interrupt handler. */ setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0); setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0); #endif #else #error "have you forgotten the isa device?" #endif if (late_console) amd64_kdb_init(); msgbufinit(msgbufp, msgbufsize); fpuinit(); /* * Reinitialize thread0's stack base now that the xsave area size is * known. Set up thread0's pcb save area after fpuinit calculated fpu * save area size. Zero out the extended state header in fpu save area. */ set_top_of_stack_td(&thread0); thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0); bzero(thread0.td_pcb->pcb_save, cpu_max_ext_state_size); if (use_xsave) { xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) + 1); xhdr->xstate_bv = xsave_mask; } /* make an initial tss so cpu can get interrupt stack on syscall! */ rsp0 = thread0.td_md.md_stack_base; /* Ensure the stack is aligned to 16 bytes */ rsp0 &= ~0xFul; PCPU_PTR(common_tss)->tss_rsp0 = rsp0; amd64_bsp_pcpu_init2(rsp0); /* transfer to user mode */ _ucodesel = GSEL(GUCODE_SEL, SEL_UPL); _udatasel = GSEL(GUDATA_SEL, SEL_UPL); _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL); _ufssel = GSEL(GUFS32_SEL, SEL_UPL); _ugssel = GSEL(GUGS32_SEL, SEL_UPL); load_ds(_udatasel); load_es(_udatasel); load_fs(_ufssel); /* setup proc 0's pcb */ thread0.td_pcb->pcb_flags = 0; thread0.td_frame = &proc0_tf; env = kern_getenv("kernelname"); if (env != NULL) strlcpy(kernelname, env, sizeof(kernelname)); cpu_probe_amdc1e(); kcsan_cpu_init(0); #ifdef FDT x86_init_fdt(); #endif thread0.td_critnest = 0; TSEXIT(); /* Location of kernel stack for locore */ return (thread0.td_md.md_stack_base); } void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) { pcpu->pc_acpi_id = 0xffffffff; } static int smap_sysctl_handler(SYSCTL_HANDLER_ARGS) { struct bios_smap *smapbase; struct bios_smap_xattr smap; caddr_t kmdp; uint32_t *smapattr; int count, error, i; /* Retrieve the system memory map from the loader. */ kmdp = preload_search_by_type("elf kernel"); if (kmdp == NULL) kmdp = preload_search_by_type("elf64 kernel"); smapbase = (struct bios_smap *)preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_SMAP); if (smapbase == NULL) return (0); smapattr = (uint32_t *)preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_SMAP_XATTR); count = *((uint32_t *)smapbase - 1) / sizeof(*smapbase); error = 0; for (i = 0; i < count; i++) { smap.base = smapbase[i].base; smap.length = smapbase[i].length; smap.type = smapbase[i].type; if (smapattr != NULL) smap.xattr = smapattr[i]; else smap.xattr = 0; error = SYSCTL_OUT(req, &smap, sizeof(smap)); } return (error); } SYSCTL_PROC(_machdep, OID_AUTO, smap, CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, smap_sysctl_handler, "S,bios_smap_xattr", "Raw BIOS SMAP data"); static int efi_map_sysctl_handler(SYSCTL_HANDLER_ARGS) { struct efi_map_header *efihdr; caddr_t kmdp; uint32_t efisize; kmdp = preload_search_by_type("elf kernel"); if (kmdp == NULL) kmdp = preload_search_by_type("elf64 kernel"); efihdr = (struct efi_map_header *)preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_EFI_MAP); if (efihdr == NULL) return (0); efisize = *((uint32_t *)efihdr - 1); return (SYSCTL_OUT(req, efihdr, efisize)); } SYSCTL_PROC(_machdep, OID_AUTO, efi_map, CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, efi_map_sysctl_handler, "S,efi_map_header", "Raw EFI Memory Map"); void spinlock_enter(void) { struct thread *td; register_t flags; td = curthread; if (td->td_md.md_spinlock_count == 0) { flags = intr_disable(); td->td_md.md_spinlock_count = 1; td->td_md.md_saved_flags = flags; critical_enter(); } else td->td_md.md_spinlock_count++; } void spinlock_exit(void) { struct thread *td; register_t flags; td = curthread; flags = td->td_md.md_saved_flags; td->td_md.md_spinlock_count--; if (td->td_md.md_spinlock_count == 0) { critical_exit(); intr_restore(flags); } } /* * Construct a PCB from a trapframe. This is called from kdb_trap() where * we want to start a backtrace from the function that caused us to enter * the debugger. We have the context in the trapframe, but base the trace * on the PCB. The PCB doesn't have to be perfect, as long as it contains * enough for a backtrace. */ void makectx(struct trapframe *tf, struct pcb *pcb) { pcb->pcb_r12 = tf->tf_r12; pcb->pcb_r13 = tf->tf_r13; pcb->pcb_r14 = tf->tf_r14; pcb->pcb_r15 = tf->tf_r15; pcb->pcb_rbp = tf->tf_rbp; pcb->pcb_rbx = tf->tf_rbx; pcb->pcb_rip = tf->tf_rip; pcb->pcb_rsp = tf->tf_rsp; } int ptrace_set_pc(struct thread *td, unsigned long addr) { td->td_frame->tf_rip = addr; set_pcb_flags(td->td_pcb, PCB_FULL_IRET); return (0); } int ptrace_single_step(struct thread *td) { PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); if ((td->td_frame->tf_rflags & PSL_T) == 0) { td->td_frame->tf_rflags |= PSL_T; td->td_dbgflags |= TDB_STEP; } return (0); } int ptrace_clear_single_step(struct thread *td) { PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); td->td_frame->tf_rflags &= ~PSL_T; td->td_dbgflags &= ~TDB_STEP; return (0); } int fill_regs(struct thread *td, struct reg *regs) { struct trapframe *tp; tp = td->td_frame; return (fill_frame_regs(tp, regs)); } int fill_frame_regs(struct trapframe *tp, struct reg *regs) { regs->r_r15 = tp->tf_r15; regs->r_r14 = tp->tf_r14; regs->r_r13 = tp->tf_r13; regs->r_r12 = tp->tf_r12; regs->r_r11 = tp->tf_r11; regs->r_r10 = tp->tf_r10; regs->r_r9 = tp->tf_r9; regs->r_r8 = tp->tf_r8; regs->r_rdi = tp->tf_rdi; regs->r_rsi = tp->tf_rsi; regs->r_rbp = tp->tf_rbp; regs->r_rbx = tp->tf_rbx; regs->r_rdx = tp->tf_rdx; regs->r_rcx = tp->tf_rcx; regs->r_rax = tp->tf_rax; regs->r_rip = tp->tf_rip; regs->r_cs = tp->tf_cs; regs->r_rflags = tp->tf_rflags; regs->r_rsp = tp->tf_rsp; regs->r_ss = tp->tf_ss; if (tp->tf_flags & TF_HASSEGS) { regs->r_ds = tp->tf_ds; regs->r_es = tp->tf_es; regs->r_fs = tp->tf_fs; regs->r_gs = tp->tf_gs; } else { regs->r_ds = 0; regs->r_es = 0; regs->r_fs = 0; regs->r_gs = 0; } regs->r_err = 0; regs->r_trapno = 0; return (0); } int set_regs(struct thread *td, struct reg *regs) { struct trapframe *tp; register_t rflags; tp = td->td_frame; rflags = regs->r_rflags & 0xffffffff; if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs)) return (EINVAL); tp->tf_r15 = regs->r_r15; tp->tf_r14 = regs->r_r14; tp->tf_r13 = regs->r_r13; tp->tf_r12 = regs->r_r12; tp->tf_r11 = regs->r_r11; tp->tf_r10 = regs->r_r10; tp->tf_r9 = regs->r_r9; tp->tf_r8 = regs->r_r8; tp->tf_rdi = regs->r_rdi; tp->tf_rsi = regs->r_rsi; tp->tf_rbp = regs->r_rbp; tp->tf_rbx = regs->r_rbx; tp->tf_rdx = regs->r_rdx; tp->tf_rcx = regs->r_rcx; tp->tf_rax = regs->r_rax; tp->tf_rip = regs->r_rip; tp->tf_cs = regs->r_cs; tp->tf_rflags = rflags; tp->tf_rsp = regs->r_rsp; tp->tf_ss = regs->r_ss; if (0) { /* XXXKIB */ tp->tf_ds = regs->r_ds; tp->tf_es = regs->r_es; tp->tf_fs = regs->r_fs; tp->tf_gs = regs->r_gs; tp->tf_flags = TF_HASSEGS; } set_pcb_flags(td->td_pcb, PCB_FULL_IRET); return (0); } /* XXX check all this stuff! */ /* externalize from sv_xmm */ static void fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs) { struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env; struct envxmm *penv_xmm = &sv_xmm->sv_env; int i; /* pcb -> fpregs */ bzero(fpregs, sizeof(*fpregs)); /* FPU control/status */ penv_fpreg->en_cw = penv_xmm->en_cw; penv_fpreg->en_sw = penv_xmm->en_sw; penv_fpreg->en_tw = penv_xmm->en_tw; penv_fpreg->en_opcode = penv_xmm->en_opcode; penv_fpreg->en_rip = penv_xmm->en_rip; penv_fpreg->en_rdp = penv_xmm->en_rdp; penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr; penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask; /* FPU registers */ for (i = 0; i < 8; ++i) bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10); /* SSE registers */ for (i = 0; i < 16; ++i) bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16); } /* internalize from fpregs into sv_xmm */ static void set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm) { struct envxmm *penv_xmm = &sv_xmm->sv_env; struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env; int i; /* fpregs -> pcb */ /* FPU control/status */ penv_xmm->en_cw = penv_fpreg->en_cw; penv_xmm->en_sw = penv_fpreg->en_sw; penv_xmm->en_tw = penv_fpreg->en_tw; penv_xmm->en_opcode = penv_fpreg->en_opcode; penv_xmm->en_rip = penv_fpreg->en_rip; penv_xmm->en_rdp = penv_fpreg->en_rdp; penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr; penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask; /* FPU registers */ for (i = 0; i < 8; ++i) bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10); /* SSE registers */ for (i = 0; i < 16; ++i) bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16); } /* externalize from td->pcb */ int fill_fpregs(struct thread *td, struct fpreg *fpregs) { KASSERT(td == curthread || TD_IS_SUSPENDED(td) || P_SHOULDSTOP(td->td_proc), ("not suspended thread %p", td)); fpugetregs(td); fill_fpregs_xmm(get_pcb_user_save_td(td), fpregs); return (0); } /* internalize to td->pcb */ int set_fpregs(struct thread *td, struct fpreg *fpregs) { critical_enter(); set_fpregs_xmm(fpregs, get_pcb_user_save_td(td)); fpuuserinited(td); critical_exit(); return (0); } /* * Get machine context. */ int get_mcontext(struct thread *td, mcontext_t *mcp, int flags) { struct pcb *pcb; struct trapframe *tp; pcb = td->td_pcb; tp = td->td_frame; PROC_LOCK(curthread->td_proc); mcp->mc_onstack = sigonstack(tp->tf_rsp); PROC_UNLOCK(curthread->td_proc); mcp->mc_r15 = tp->tf_r15; mcp->mc_r14 = tp->tf_r14; mcp->mc_r13 = tp->tf_r13; mcp->mc_r12 = tp->tf_r12; mcp->mc_r11 = tp->tf_r11; mcp->mc_r10 = tp->tf_r10; mcp->mc_r9 = tp->tf_r9; mcp->mc_r8 = tp->tf_r8; mcp->mc_rdi = tp->tf_rdi; mcp->mc_rsi = tp->tf_rsi; mcp->mc_rbp = tp->tf_rbp; mcp->mc_rbx = tp->tf_rbx; mcp->mc_rcx = tp->tf_rcx; mcp->mc_rflags = tp->tf_rflags; if (flags & GET_MC_CLEAR_RET) { mcp->mc_rax = 0; mcp->mc_rdx = 0; mcp->mc_rflags &= ~PSL_C; } else { mcp->mc_rax = tp->tf_rax; mcp->mc_rdx = tp->tf_rdx; } mcp->mc_rip = tp->tf_rip; mcp->mc_cs = tp->tf_cs; mcp->mc_rsp = tp->tf_rsp; mcp->mc_ss = tp->tf_ss; mcp->mc_ds = tp->tf_ds; mcp->mc_es = tp->tf_es; mcp->mc_fs = tp->tf_fs; mcp->mc_gs = tp->tf_gs; mcp->mc_flags = tp->tf_flags; mcp->mc_len = sizeof(*mcp); get_fpcontext(td, mcp, NULL, 0); update_pcb_bases(pcb); mcp->mc_fsbase = pcb->pcb_fsbase; mcp->mc_gsbase = pcb->pcb_gsbase; mcp->mc_xfpustate = 0; mcp->mc_xfpustate_len = 0; bzero(mcp->mc_spare, sizeof(mcp->mc_spare)); return (0); } /* * Set machine context. * * However, we don't set any but the user modifiable flags, and we won't * touch the cs selector. */ int set_mcontext(struct thread *td, mcontext_t *mcp) { struct pcb *pcb; struct trapframe *tp; char *xfpustate; long rflags; int ret; pcb = td->td_pcb; tp = td->td_frame; if (mcp->mc_len != sizeof(*mcp) || (mcp->mc_flags & ~_MC_FLAG_MASK) != 0) return (EINVAL); rflags = (mcp->mc_rflags & PSL_USERCHANGE) | (tp->tf_rflags & ~PSL_USERCHANGE); if (mcp->mc_flags & _MC_HASFPXSTATE) { if (mcp->mc_xfpustate_len > cpu_max_ext_state_size - sizeof(struct savefpu)) return (EINVAL); xfpustate = __builtin_alloca(mcp->mc_xfpustate_len); ret = copyin((void *)mcp->mc_xfpustate, xfpustate, mcp->mc_xfpustate_len); if (ret != 0) return (ret); } else xfpustate = NULL; ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len); if (ret != 0) return (ret); tp->tf_r15 = mcp->mc_r15; tp->tf_r14 = mcp->mc_r14; tp->tf_r13 = mcp->mc_r13; tp->tf_r12 = mcp->mc_r12; tp->tf_r11 = mcp->mc_r11; tp->tf_r10 = mcp->mc_r10; tp->tf_r9 = mcp->mc_r9; tp->tf_r8 = mcp->mc_r8; tp->tf_rdi = mcp->mc_rdi; tp->tf_rsi = mcp->mc_rsi; tp->tf_rbp = mcp->mc_rbp; tp->tf_rbx = mcp->mc_rbx; tp->tf_rdx = mcp->mc_rdx; tp->tf_rcx = mcp->mc_rcx; tp->tf_rax = mcp->mc_rax; tp->tf_rip = mcp->mc_rip; tp->tf_rflags = rflags; tp->tf_rsp = mcp->mc_rsp; tp->tf_ss = mcp->mc_ss; tp->tf_flags = mcp->mc_flags; if (tp->tf_flags & TF_HASSEGS) { tp->tf_ds = mcp->mc_ds; tp->tf_es = mcp->mc_es; tp->tf_fs = mcp->mc_fs; tp->tf_gs = mcp->mc_gs; } set_pcb_flags(pcb, PCB_FULL_IRET); if (mcp->mc_flags & _MC_HASBASES) { pcb->pcb_fsbase = mcp->mc_fsbase; pcb->pcb_gsbase = mcp->mc_gsbase; } return (0); } static void get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave, size_t xfpusave_len) { size_t max_len, len; mcp->mc_ownedfp = fpugetregs(td); bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0], sizeof(mcp->mc_fpstate)); mcp->mc_fpformat = fpuformat(); if (!use_xsave || xfpusave_len == 0) return; max_len = cpu_max_ext_state_size - sizeof(struct savefpu); len = xfpusave_len; if (len > max_len) { len = max_len; bzero(xfpusave + max_len, len - max_len); } mcp->mc_flags |= _MC_HASFPXSTATE; mcp->mc_xfpustate_len = len; bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len); } static int set_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpustate, size_t xfpustate_len) { int error; if (mcp->mc_fpformat == _MC_FPFMT_NODEV) return (0); else if (mcp->mc_fpformat != _MC_FPFMT_XMM) return (EINVAL); else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) { /* We don't care what state is left in the FPU or PCB. */ fpstate_drop(td); error = 0; } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU || mcp->mc_ownedfp == _MC_FPOWNED_PCB) { error = fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate, xfpustate, xfpustate_len); } else return (EINVAL); return (error); } void fpstate_drop(struct thread *td) { KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu")); critical_enter(); if (PCPU_GET(fpcurthread) == td) fpudrop(); /* * XXX force a full drop of the fpu. The above only drops it if we * owned it. * * XXX I don't much like fpugetuserregs()'s semantics of doing a full * drop. Dropping only to the pcb matches fnsave's behaviour. * We only need to drop to !PCB_INITDONE in sendsig(). But * sendsig() is the only caller of fpugetuserregs()... perhaps we just * have too many layers. */ clear_pcb_flags(curthread->td_pcb, PCB_FPUINITDONE | PCB_USERFPUINITDONE); critical_exit(); } int fill_dbregs(struct thread *td, struct dbreg *dbregs) { struct pcb *pcb; if (td == NULL) { dbregs->dr[0] = rdr0(); dbregs->dr[1] = rdr1(); dbregs->dr[2] = rdr2(); dbregs->dr[3] = rdr3(); dbregs->dr[6] = rdr6(); dbregs->dr[7] = rdr7(); } else { pcb = td->td_pcb; dbregs->dr[0] = pcb->pcb_dr0; dbregs->dr[1] = pcb->pcb_dr1; dbregs->dr[2] = pcb->pcb_dr2; dbregs->dr[3] = pcb->pcb_dr3; dbregs->dr[6] = pcb->pcb_dr6; dbregs->dr[7] = pcb->pcb_dr7; } dbregs->dr[4] = 0; dbregs->dr[5] = 0; dbregs->dr[8] = 0; dbregs->dr[9] = 0; dbregs->dr[10] = 0; dbregs->dr[11] = 0; dbregs->dr[12] = 0; dbregs->dr[13] = 0; dbregs->dr[14] = 0; dbregs->dr[15] = 0; return (0); } int set_dbregs(struct thread *td, struct dbreg *dbregs) { struct pcb *pcb; int i; if (td == NULL) { load_dr0(dbregs->dr[0]); load_dr1(dbregs->dr[1]); load_dr2(dbregs->dr[2]); load_dr3(dbregs->dr[3]); load_dr6(dbregs->dr[6]); load_dr7(dbregs->dr[7]); } else { /* * Don't let an illegal value for dr7 get set. Specifically, * check for undefined settings. Setting these bit patterns * result in undefined behaviour and can lead to an unexpected * TRCTRAP or a general protection fault right here. * Upper bits of dr6 and dr7 must not be set */ for (i = 0; i < 4; i++) { if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02) return (EINVAL); if (td->td_frame->tf_cs == _ucode32sel && DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8) return (EINVAL); } if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 || (dbregs->dr[7] & 0xffffffff00000000ul) != 0) return (EINVAL); pcb = td->td_pcb; /* * Don't let a process set a breakpoint that is not within the * process's address space. If a process could do this, it * could halt the system by setting a breakpoint in the kernel * (if ddb was enabled). Thus, we need to check to make sure * that no breakpoints are being enabled for addresses outside * process's address space. * * XXX - what about when the watched area of the user's * address space is written into from within the kernel * ... wouldn't that still cause a breakpoint to be generated * from within kernel mode? */ if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) { /* dr0 is enabled */ if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS) return (EINVAL); } if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) { /* dr1 is enabled */ if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS) return (EINVAL); } if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) { /* dr2 is enabled */ if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS) return (EINVAL); } if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) { /* dr3 is enabled */ if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS) return (EINVAL); } pcb->pcb_dr0 = dbregs->dr[0]; pcb->pcb_dr1 = dbregs->dr[1]; pcb->pcb_dr2 = dbregs->dr[2]; pcb->pcb_dr3 = dbregs->dr[3]; pcb->pcb_dr6 = dbregs->dr[6]; pcb->pcb_dr7 = dbregs->dr[7]; set_pcb_flags(pcb, PCB_DBREGS); } return (0); } void reset_dbregs(void) { load_dr7(0); /* Turn off the control bits first */ load_dr0(0); load_dr1(0); load_dr2(0); load_dr3(0); load_dr6(0); } /* * Return > 0 if a hardware breakpoint has been hit, and the * breakpoint was in user space. Return 0, otherwise. */ int user_dbreg_trap(register_t dr6) { u_int64_t dr7; u_int64_t bp; /* breakpoint bits extracted from dr6 */ int nbp; /* number of breakpoints that triggered */ caddr_t addr[4]; /* breakpoint addresses */ int i; bp = dr6 & DBREG_DR6_BMASK; if (bp == 0) { /* * None of the breakpoint bits are set meaning this * trap was not caused by any of the debug registers */ return 0; } dr7 = rdr7(); if ((dr7 & 0x000000ff) == 0) { /* * all GE and LE bits in the dr7 register are zero, * thus the trap couldn't have been caused by the * hardware debug registers */ return 0; } nbp = 0; /* * at least one of the breakpoints were hit, check to see * which ones and if any of them are user space addresses */ if (bp & 0x01) { addr[nbp++] = (caddr_t)rdr0(); } if (bp & 0x02) { addr[nbp++] = (caddr_t)rdr1(); } if (bp & 0x04) { addr[nbp++] = (caddr_t)rdr2(); } if (bp & 0x08) { addr[nbp++] = (caddr_t)rdr3(); } for (i = 0; i < nbp; i++) { if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) { /* * addr[i] is in user space */ return nbp; } } /* * None of the breakpoints are in user space. */ return 0; } /* * The pcb_flags is only modified by current thread, or by other threads * when current thread is stopped. However, current thread may change it * from the interrupt context in cpu_switch(), or in the trap handler. * When we read-modify-write pcb_flags from C sources, compiler may generate * code that is not atomic regarding the interrupt handler. If a trap or * interrupt happens and any flag is modified from the handler, it can be * clobbered with the cached value later. Therefore, we implement setting * and clearing flags with single-instruction functions, which do not race * with possible modification of the flags from the trap or interrupt context, * because traps and interrupts are executed only on instruction boundary. */ void set_pcb_flags_raw(struct pcb *pcb, const u_int flags) { __asm __volatile("orl %1,%0" : "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags) : "cc", "memory"); } /* * The support for RDFSBASE, WRFSBASE and similar instructions for %gs * base requires that kernel saves MSR_FSBASE and MSR_{K,}GSBASE into * pcb if user space modified the bases. We must save on the context * switch or if the return to usermode happens through the doreti. * * Tracking of both events is performed by the pcb flag PCB_FULL_IRET, * which have a consequence that the base MSRs must be saved each time * the PCB_FULL_IRET flag is set. We disable interrupts to sync with * context switches. */ static void set_pcb_flags_fsgsbase(struct pcb *pcb, const u_int flags) { register_t r; if (curpcb == pcb && (flags & PCB_FULL_IRET) != 0 && (pcb->pcb_flags & PCB_FULL_IRET) == 0) { r = intr_disable(); if ((pcb->pcb_flags & PCB_FULL_IRET) == 0) { if (rfs() == _ufssel) pcb->pcb_fsbase = rdfsbase(); if (rgs() == _ugssel) pcb->pcb_gsbase = rdmsr(MSR_KGSBASE); } set_pcb_flags_raw(pcb, flags); intr_restore(r); } else { set_pcb_flags_raw(pcb, flags); } } DEFINE_IFUNC(, void, set_pcb_flags, (struct pcb *, const u_int)) { return ((cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0 ? set_pcb_flags_fsgsbase : set_pcb_flags_raw); } void clear_pcb_flags(struct pcb *pcb, const u_int flags) { __asm __volatile("andl %1,%0" : "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags) : "cc", "memory"); } #ifdef KDB /* * Provide inb() and outb() as functions. They are normally only available as * inline functions, thus cannot be called from the debugger. */ /* silence compiler warnings */ u_char inb_(u_short); void outb_(u_short, u_char); u_char inb_(u_short port) { return inb(port); } void outb_(u_short port, u_char data) { outb(port, data); } #endif /* KDB */ #undef memset #undef memmove #undef memcpy void *memset_std(void *buf, int c, size_t len); void *memset_erms(void *buf, int c, size_t len); void *memmove_std(void * _Nonnull dst, const void * _Nonnull src, size_t len); void *memmove_erms(void * _Nonnull dst, const void * _Nonnull src, size_t len); void *memcpy_std(void * _Nonnull dst, const void * _Nonnull src, size_t len); void *memcpy_erms(void * _Nonnull dst, const void * _Nonnull src, size_t len); #ifdef KCSAN /* * These fail to build as ifuncs when used with KCSAN. */ void * memset(void *buf, int c, size_t len) { return (memset_std(buf, c, len)); } void * memmove(void * _Nonnull dst, const void * _Nonnull src, size_t len) { return (memmove_std(dst, src, len)); } void * memcpy(void * _Nonnull dst, const void * _Nonnull src, size_t len) { return (memcpy_std(dst, src, len)); } #else DEFINE_IFUNC(, void *, memset, (void *, int, size_t)) { return ((cpu_stdext_feature & CPUID_STDEXT_ERMS) != 0 ? memset_erms : memset_std); } DEFINE_IFUNC(, void *, memmove, (void * _Nonnull, const void * _Nonnull, size_t)) { return ((cpu_stdext_feature & CPUID_STDEXT_ERMS) != 0 ? memmove_erms : memmove_std); } DEFINE_IFUNC(, void *, memcpy, (void * _Nonnull, const void * _Nonnull,size_t)) { return ((cpu_stdext_feature & CPUID_STDEXT_ERMS) != 0 ? memcpy_erms : memcpy_std); } #endif void pagezero_std(void *addr); void pagezero_erms(void *addr); DEFINE_IFUNC(, void , pagezero, (void *)) { return ((cpu_stdext_feature & CPUID_STDEXT_ERMS) != 0 ? pagezero_erms : pagezero_std); } Index: head/sys/arm64/arm64/elf_machdep.c =================================================================== --- head/sys/arm64/arm64/elf_machdep.c (revision 362943) +++ head/sys/arm64/arm64/elf_machdep.c (revision 362944) @@ -1,265 +1,284 @@ /*- * Copyright (c) 2014, 2015 The FreeBSD Foundation. * Copyright (c) 2014 Andrew Turner. * All rights reserved. * * This software was developed by Andrew Turner under * sponsorship from the FreeBSD Foundation. * * Portions of this software were developed by Konstantin Belousov * under sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "linker_if.h" u_long elf_hwcap; static struct sysentvec elf64_freebsd_sysvec = { .sv_size = SYS_MAXSYSCALL, .sv_table = sysent, .sv_errsize = 0, .sv_errtbl = NULL, .sv_transtrap = NULL, .sv_fixup = __elfN(freebsd_fixup), .sv_sendsig = sendsig, .sv_sigcode = sigcode, .sv_szsigcode = &szsigcode, .sv_name = "FreeBSD ELF64", .sv_coredump = __elfN(coredump), .sv_imgact_try = NULL, .sv_minsigstksz = MINSIGSTKSZ, .sv_minuser = VM_MIN_ADDRESS, .sv_maxuser = VM_MAXUSER_ADDRESS, .sv_usrstack = USRSTACK, .sv_psstrings = PS_STRINGS, .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs), .sv_copyout_strings = exec_copyout_strings, .sv_setregs = exec_setregs, .sv_fixlimit = NULL, .sv_maxssiz = NULL, .sv_flags = SV_SHP | SV_TIMEKEEP | SV_ABI_FREEBSD | SV_LP64 | SV_ASLR, .sv_set_syscall_retval = cpu_set_syscall_retval, .sv_fetch_syscall_args = cpu_fetch_syscall_args, .sv_syscallnames = syscallnames, .sv_shared_page_base = SHAREDPAGE, .sv_shared_page_len = PAGE_SIZE, .sv_schedtail = NULL, .sv_thread_detach = NULL, .sv_trap = NULL, .sv_hwcap = &elf_hwcap, }; INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); static Elf64_Brandinfo freebsd_brand_info = { .brand = ELFOSABI_FREEBSD, .machine = EM_AARCH64, .compat_3_brand = "FreeBSD", .emul_path = NULL, .interp_path = "/libexec/ld-elf.so.1", .sysvec = &elf64_freebsd_sysvec, .interp_newpath = NULL, .brand_note = &elf64_freebsd_brandnote, .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE }; SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info); void elf64_dump_thread(struct thread *td __unused, void *dst __unused, size_t *off __unused) { } bool elf_is_ifunc_reloc(Elf_Size r_info __unused) { return (ELF_R_TYPE(r_info) == R_AARCH64_IRELATIVE); } static int reloc_instr_imm(Elf32_Addr *where, Elf_Addr val, u_int msb, u_int lsb) { /* Check bounds: upper bits must be all ones or all zeros. */ if ((uint64_t)((int64_t)val >> (msb + 1)) + 1 > 1) return (-1); val >>= lsb; val &= (1 << (msb - lsb + 1)) - 1; *where |= (Elf32_Addr)val; return (0); } /* * Process a relocation. Support for some static relocations is required * in order for the -zifunc-noplt optimization to work. */ static int elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, - int type, int local, elf_lookup_fn lookup) + int type, int flags, elf_lookup_fn lookup) { +#define ARM64_ELF_RELOC_LOCAL (1 << 0) +#define ARM64_ELF_RELOC_LATE_IFUNC (1 << 1) Elf_Addr *where, addr, addend, val; Elf_Word rtype, symidx; const Elf_Rel *rel; const Elf_Rela *rela; int error; switch (type) { case ELF_RELOC_REL: rel = (const Elf_Rel *)data; where = (Elf_Addr *) (relocbase + rel->r_offset); addend = *where; rtype = ELF_R_TYPE(rel->r_info); symidx = ELF_R_SYM(rel->r_info); break; case ELF_RELOC_RELA: rela = (const Elf_Rela *)data; where = (Elf_Addr *) (relocbase + rela->r_offset); addend = rela->r_addend; rtype = ELF_R_TYPE(rela->r_info); symidx = ELF_R_SYM(rela->r_info); break; default: panic("unknown reloc type %d\n", type); } - if (local) { + if ((flags & ARM64_ELF_RELOC_LATE_IFUNC) != 0) { + KASSERT(type == ELF_RELOC_RELA, + ("Only RELA ifunc relocations are supported")); + if (rtype != R_AARCH64_IRELATIVE) + return (0); + } + + if ((flags & ARM64_ELF_RELOC_LOCAL) != 0) { if (rtype == R_AARCH64_RELATIVE) *where = elf_relocaddr(lf, relocbase + addend); return (0); } error = 0; switch (rtype) { case R_AARCH64_NONE: case R_AARCH64_RELATIVE: break; case R_AARCH64_TSTBR14: error = lookup(lf, symidx, 1, &addr); if (error != 0) return (-1); error = reloc_instr_imm((Elf32_Addr *)where, addr + addend - (Elf_Addr)where, 15, 2); break; case R_AARCH64_CONDBR19: error = lookup(lf, symidx, 1, &addr); if (error != 0) return (-1); error = reloc_instr_imm((Elf32_Addr *)where, addr + addend - (Elf_Addr)where, 20, 2); break; case R_AARCH64_JUMP26: case R_AARCH64_CALL26: error = lookup(lf, symidx, 1, &addr); if (error != 0) return (-1); error = reloc_instr_imm((Elf32_Addr *)where, addr + addend - (Elf_Addr)where, 27, 2); break; case R_AARCH64_ABS64: case R_AARCH64_GLOB_DAT: case R_AARCH64_JUMP_SLOT: error = lookup(lf, symidx, 1, &addr); if (error != 0) return (-1); *where = addr + addend; break; case R_AARCH64_IRELATIVE: addr = relocbase + addend; val = ((Elf64_Addr (*)(void))addr)(); if (*where != val) *where = val; break; default: printf("kldload: unexpected relocation type %d\n", rtype); return (-1); } return (error); } int elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, elf_lookup_fn lookup) { - return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); + return (elf_reloc_internal(lf, relocbase, data, type, + ARM64_ELF_RELOC_LOCAL, lookup)); } /* Process one elf relocation with addend. */ int elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, elf_lookup_fn lookup) { return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); +} + +int +elf_reloc_late(linker_file_t lf, Elf_Addr relocbase, const void *data, + int type, elf_lookup_fn lookup) +{ + + return (elf_reloc_internal(lf, relocbase, data, type, + ARM64_ELF_RELOC_LATE_IFUNC, lookup)); } int elf_cpu_load_file(linker_file_t lf) { if (lf->id != 1) cpu_icache_sync_range((vm_offset_t)lf->address, lf->size); return (0); } int elf_cpu_unload_file(linker_file_t lf __unused) { return (0); } int elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused) { return (0); } Index: head/sys/arm64/arm64/machdep.c =================================================================== --- head/sys/arm64/arm64/machdep.c (revision 362943) +++ head/sys/arm64/arm64/machdep.c (revision 362944) @@ -1,1342 +1,1349 @@ /*- * Copyright (c) 2014 Andrew Turner * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */ #include "opt_acpi.h" #include "opt_platform.h" #include "opt_ddb.h" #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef VFP #include #endif #ifdef DEV_ACPI #include #include #endif #ifdef FDT #include #include #endif static void get_fpcontext(struct thread *td, mcontext_t *mcp); static void set_fpcontext(struct thread *td, mcontext_t *mcp); enum arm64_bus arm64_bus_method = ARM64_BUS_NONE; struct pcpu __pcpu[MAXCPU]; static struct trapframe proc0_tf; int early_boot = 1; int cold = 1; static int boot_el; struct kva_md_info kmi; int64_t dczva_line_size; /* The size of cache line the dc zva zeroes */ int has_pan; /* * Physical address of the EFI System Table. Stashed from the metadata hints * passed into the kernel and used by the EFI code to call runtime services. */ vm_paddr_t efi_systbl_phys; static struct efi_map_header *efihdr; /* pagezero_* implementations are provided in support.S */ void pagezero_simple(void *); void pagezero_cache(void *); /* pagezero_simple is default pagezero */ void (*pagezero)(void *p) = pagezero_simple; static void pan_setup(void) { uint64_t id_aa64mfr1; id_aa64mfr1 = READ_SPECIALREG(id_aa64mmfr1_el1); if (ID_AA64MMFR1_PAN_VAL(id_aa64mfr1) != ID_AA64MMFR1_PAN_NONE) has_pan = 1; } void pan_enable(void) { /* * The LLVM integrated assembler doesn't understand the PAN * PSTATE field. Because of this we need to manually create * the instruction in an asm block. This is equivalent to: * msr pan, #1 * * This sets the PAN bit, stopping the kernel from accessing * memory when userspace can also access it unless the kernel * uses the userspace load/store instructions. */ if (has_pan) { WRITE_SPECIALREG(sctlr_el1, READ_SPECIALREG(sctlr_el1) & ~SCTLR_SPAN); __asm __volatile(".inst 0xd500409f | (0x1 << 8)"); } } bool has_hyp(void) { return (boot_el == 2); } static void cpu_startup(void *dummy) { undef_init(); install_cpu_errata(); vm_ksubmap_init(&kmi); bufinit(); vm_pager_bufferinit(); } SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); +static void +late_ifunc_resolve(void *dummy __unused) +{ + link_elf_late_ireloc(); +} +SYSINIT(late_ifunc_resolve, SI_SUB_CPU, SI_ORDER_ANY, late_ifunc_resolve, NULL); + int cpu_idle_wakeup(int cpu) { return (0); } int fill_regs(struct thread *td, struct reg *regs) { struct trapframe *frame; frame = td->td_frame; regs->sp = frame->tf_sp; regs->lr = frame->tf_lr; regs->elr = frame->tf_elr; regs->spsr = frame->tf_spsr; memcpy(regs->x, frame->tf_x, sizeof(regs->x)); #ifdef COMPAT_FREEBSD32 /* * We may be called here for a 32bits process, if we're using a * 64bits debugger. If so, put PC and SPSR where it expects it. */ if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { regs->x[15] = frame->tf_elr; regs->x[16] = frame->tf_spsr; } #endif return (0); } int set_regs(struct thread *td, struct reg *regs) { struct trapframe *frame; frame = td->td_frame; frame->tf_sp = regs->sp; frame->tf_lr = regs->lr; frame->tf_elr = regs->elr; frame->tf_spsr &= ~PSR_FLAGS; frame->tf_spsr |= regs->spsr & PSR_FLAGS; memcpy(frame->tf_x, regs->x, sizeof(frame->tf_x)); #ifdef COMPAT_FREEBSD32 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { /* * We may be called for a 32bits process if we're using * a 64bits debugger. If so, get PC and SPSR from where * it put it. */ frame->tf_elr = regs->x[15]; frame->tf_spsr = regs->x[16] & PSR_FLAGS; } #endif return (0); } int fill_fpregs(struct thread *td, struct fpreg *regs) { #ifdef VFP struct pcb *pcb; pcb = td->td_pcb; if ((pcb->pcb_fpflags & PCB_FP_STARTED) != 0) { /* * If we have just been running VFP instructions we will * need to save the state to memcpy it below. */ if (td == curthread) vfp_save_state(td, pcb); KASSERT(pcb->pcb_fpusaved == &pcb->pcb_fpustate, ("Called fill_fpregs while the kernel is using the VFP")); memcpy(regs->fp_q, pcb->pcb_fpustate.vfp_regs, sizeof(regs->fp_q)); regs->fp_cr = pcb->pcb_fpustate.vfp_fpcr; regs->fp_sr = pcb->pcb_fpustate.vfp_fpsr; } else #endif memset(regs, 0, sizeof(*regs)); return (0); } int set_fpregs(struct thread *td, struct fpreg *regs) { #ifdef VFP struct pcb *pcb; pcb = td->td_pcb; KASSERT(pcb->pcb_fpusaved == &pcb->pcb_fpustate, ("Called set_fpregs while the kernel is using the VFP")); memcpy(pcb->pcb_fpustate.vfp_regs, regs->fp_q, sizeof(regs->fp_q)); pcb->pcb_fpustate.vfp_fpcr = regs->fp_cr; pcb->pcb_fpustate.vfp_fpsr = regs->fp_sr; #endif return (0); } int fill_dbregs(struct thread *td, struct dbreg *regs) { struct debug_monitor_state *monitor; int count, i; uint8_t debug_ver, nbkpts; memset(regs, 0, sizeof(*regs)); extract_user_id_field(ID_AA64DFR0_EL1, ID_AA64DFR0_DebugVer_SHIFT, &debug_ver); extract_user_id_field(ID_AA64DFR0_EL1, ID_AA64DFR0_BRPs_SHIFT, &nbkpts); /* * The BRPs field contains the number of breakpoints - 1. Armv8-A * allows the hardware to provide 2-16 breakpoints so this won't * overflow an 8 bit value. */ count = nbkpts + 1; regs->db_info = debug_ver; regs->db_info <<= 8; regs->db_info |= count; monitor = &td->td_pcb->pcb_dbg_regs; if ((monitor->dbg_flags & DBGMON_ENABLED) != 0) { for (i = 0; i < count; i++) { regs->db_regs[i].dbr_addr = monitor->dbg_bvr[i]; regs->db_regs[i].dbr_ctrl = monitor->dbg_bcr[i]; } } return (0); } int set_dbregs(struct thread *td, struct dbreg *regs) { struct debug_monitor_state *monitor; int count; int i; monitor = &td->td_pcb->pcb_dbg_regs; count = 0; monitor->dbg_enable_count = 0; for (i = 0; i < DBG_BRP_MAX; i++) { /* TODO: Check these values */ monitor->dbg_bvr[i] = regs->db_regs[i].dbr_addr; monitor->dbg_bcr[i] = regs->db_regs[i].dbr_ctrl; if ((monitor->dbg_bcr[i] & 1) != 0) monitor->dbg_enable_count++; } if (monitor->dbg_enable_count > 0) monitor->dbg_flags |= DBGMON_ENABLED; return (0); } #ifdef COMPAT_FREEBSD32 int fill_regs32(struct thread *td, struct reg32 *regs) { int i; struct trapframe *tf; tf = td->td_frame; for (i = 0; i < 13; i++) regs->r[i] = tf->tf_x[i]; /* For arm32, SP is r13 and LR is r14 */ regs->r_sp = tf->tf_x[13]; regs->r_lr = tf->tf_x[14]; regs->r_pc = tf->tf_elr; regs->r_cpsr = tf->tf_spsr; return (0); } int set_regs32(struct thread *td, struct reg32 *regs) { int i; struct trapframe *tf; tf = td->td_frame; for (i = 0; i < 13; i++) tf->tf_x[i] = regs->r[i]; /* For arm 32, SP is r13 an LR is r14 */ tf->tf_x[13] = regs->r_sp; tf->tf_x[14] = regs->r_lr; tf->tf_elr = regs->r_pc; tf->tf_spsr = regs->r_cpsr; return (0); } int fill_fpregs32(struct thread *td, struct fpreg32 *regs) { printf("ARM64TODO: fill_fpregs32"); return (EDOOFUS); } int set_fpregs32(struct thread *td, struct fpreg32 *regs) { printf("ARM64TODO: set_fpregs32"); return (EDOOFUS); } int fill_dbregs32(struct thread *td, struct dbreg32 *regs) { printf("ARM64TODO: fill_dbregs32"); return (EDOOFUS); } int set_dbregs32(struct thread *td, struct dbreg32 *regs) { printf("ARM64TODO: set_dbregs32"); return (EDOOFUS); } #endif int ptrace_set_pc(struct thread *td, u_long addr) { td->td_frame->tf_elr = addr; return (0); } int ptrace_single_step(struct thread *td) { td->td_frame->tf_spsr |= PSR_SS; td->td_pcb->pcb_flags |= PCB_SINGLE_STEP; return (0); } int ptrace_clear_single_step(struct thread *td) { td->td_frame->tf_spsr &= ~PSR_SS; td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP; return (0); } void exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack) { struct trapframe *tf = td->td_frame; memset(tf, 0, sizeof(struct trapframe)); tf->tf_x[0] = stack; tf->tf_sp = STACKALIGN(stack); tf->tf_lr = imgp->entry_addr; tf->tf_elr = imgp->entry_addr; } /* Sanity check these are the same size, they will be memcpy'd to and fro */ CTASSERT(sizeof(((struct trapframe *)0)->tf_x) == sizeof((struct gpregs *)0)->gp_x); CTASSERT(sizeof(((struct trapframe *)0)->tf_x) == sizeof((struct reg *)0)->x); int get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret) { struct trapframe *tf = td->td_frame; if (clear_ret & GET_MC_CLEAR_RET) { mcp->mc_gpregs.gp_x[0] = 0; mcp->mc_gpregs.gp_spsr = tf->tf_spsr & ~PSR_C; } else { mcp->mc_gpregs.gp_x[0] = tf->tf_x[0]; mcp->mc_gpregs.gp_spsr = tf->tf_spsr; } memcpy(&mcp->mc_gpregs.gp_x[1], &tf->tf_x[1], sizeof(mcp->mc_gpregs.gp_x[1]) * (nitems(mcp->mc_gpregs.gp_x) - 1)); mcp->mc_gpregs.gp_sp = tf->tf_sp; mcp->mc_gpregs.gp_lr = tf->tf_lr; mcp->mc_gpregs.gp_elr = tf->tf_elr; get_fpcontext(td, mcp); return (0); } int set_mcontext(struct thread *td, mcontext_t *mcp) { struct trapframe *tf = td->td_frame; uint32_t spsr; spsr = mcp->mc_gpregs.gp_spsr; if ((spsr & PSR_M_MASK) != PSR_M_EL0t || (spsr & PSR_AARCH32) != 0 || (spsr & PSR_DAIF) != (td->td_frame->tf_spsr & PSR_DAIF)) return (EINVAL); memcpy(tf->tf_x, mcp->mc_gpregs.gp_x, sizeof(tf->tf_x)); tf->tf_sp = mcp->mc_gpregs.gp_sp; tf->tf_lr = mcp->mc_gpregs.gp_lr; tf->tf_elr = mcp->mc_gpregs.gp_elr; tf->tf_spsr = mcp->mc_gpregs.gp_spsr; set_fpcontext(td, mcp); return (0); } static void get_fpcontext(struct thread *td, mcontext_t *mcp) { #ifdef VFP struct pcb *curpcb; critical_enter(); curpcb = curthread->td_pcb; if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) { /* * If we have just been running VFP instructions we will * need to save the state to memcpy it below. */ vfp_save_state(td, curpcb); KASSERT(curpcb->pcb_fpusaved == &curpcb->pcb_fpustate, ("Called get_fpcontext while the kernel is using the VFP")); KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0, ("Non-userspace FPU flags set in get_fpcontext")); memcpy(mcp->mc_fpregs.fp_q, curpcb->pcb_fpustate.vfp_regs, sizeof(mcp->mc_fpregs)); mcp->mc_fpregs.fp_cr = curpcb->pcb_fpustate.vfp_fpcr; mcp->mc_fpregs.fp_sr = curpcb->pcb_fpustate.vfp_fpsr; mcp->mc_fpregs.fp_flags = curpcb->pcb_fpflags; mcp->mc_flags |= _MC_FP_VALID; } critical_exit(); #endif } static void set_fpcontext(struct thread *td, mcontext_t *mcp) { #ifdef VFP struct pcb *curpcb; critical_enter(); if ((mcp->mc_flags & _MC_FP_VALID) != 0) { curpcb = curthread->td_pcb; /* * Discard any vfp state for the current thread, we * are about to override it. */ vfp_discard(td); KASSERT(curpcb->pcb_fpusaved == &curpcb->pcb_fpustate, ("Called set_fpcontext while the kernel is using the VFP")); memcpy(curpcb->pcb_fpustate.vfp_regs, mcp->mc_fpregs.fp_q, sizeof(mcp->mc_fpregs)); curpcb->pcb_fpustate.vfp_fpcr = mcp->mc_fpregs.fp_cr; curpcb->pcb_fpustate.vfp_fpsr = mcp->mc_fpregs.fp_sr; curpcb->pcb_fpflags = mcp->mc_fpregs.fp_flags & PCB_FP_USERMASK; } critical_exit(); #endif } void cpu_idle(int busy) { spinlock_enter(); if (!busy) cpu_idleclock(); if (!sched_runnable()) __asm __volatile( "dsb sy \n" "wfi \n"); if (!busy) cpu_activeclock(); spinlock_exit(); } void cpu_halt(void) { /* We should have shutdown by now, if not enter a low power sleep */ intr_disable(); while (1) { __asm __volatile("wfi"); } } /* * Flush the D-cache for non-DMA I/O so that the I-cache can * be made coherent later. */ void cpu_flush_dcache(void *ptr, size_t len) { /* ARM64TODO TBD */ } /* Get current clock frequency for the given CPU ID. */ int cpu_est_clockrate(int cpu_id, uint64_t *rate) { struct pcpu *pc; pc = pcpu_find(cpu_id); if (pc == NULL || rate == NULL) return (EINVAL); if (pc->pc_clock == 0) return (EOPNOTSUPP); *rate = pc->pc_clock; return (0); } void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) { pcpu->pc_acpi_id = 0xffffffff; } void spinlock_enter(void) { struct thread *td; register_t daif; td = curthread; if (td->td_md.md_spinlock_count == 0) { daif = intr_disable(); td->td_md.md_spinlock_count = 1; td->td_md.md_saved_daif = daif; critical_enter(); } else td->td_md.md_spinlock_count++; } void spinlock_exit(void) { struct thread *td; register_t daif; td = curthread; daif = td->td_md.md_saved_daif; td->td_md.md_spinlock_count--; if (td->td_md.md_spinlock_count == 0) { critical_exit(); intr_restore(daif); } } #ifndef _SYS_SYSPROTO_H_ struct sigreturn_args { ucontext_t *ucp; }; #endif int sys_sigreturn(struct thread *td, struct sigreturn_args *uap) { ucontext_t uc; int error; if (copyin(uap->sigcntxp, &uc, sizeof(uc))) return (EFAULT); error = set_mcontext(td, &uc.uc_mcontext); if (error != 0) return (error); /* Restore signal mask. */ kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); return (EJUSTRETURN); } /* * Construct a PCB from a trapframe. This is called from kdb_trap() where * we want to start a backtrace from the function that caused us to enter * the debugger. We have the context in the trapframe, but base the trace * on the PCB. The PCB doesn't have to be perfect, as long as it contains * enough for a backtrace. */ void makectx(struct trapframe *tf, struct pcb *pcb) { int i; for (i = 0; i < PCB_LR; i++) pcb->pcb_x[i] = tf->tf_x[i]; pcb->pcb_x[PCB_LR] = tf->tf_lr; pcb->pcb_pc = tf->tf_elr; pcb->pcb_sp = tf->tf_sp; } void sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) { struct thread *td; struct proc *p; struct trapframe *tf; struct sigframe *fp, frame; struct sigacts *psp; struct sysentvec *sysent; int onstack, sig; td = curthread; p = td->td_proc; PROC_LOCK_ASSERT(p, MA_OWNED); sig = ksi->ksi_signo; psp = p->p_sigacts; mtx_assert(&psp->ps_mtx, MA_OWNED); tf = td->td_frame; onstack = sigonstack(tf->tf_sp); CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, catcher, sig); /* Allocate and validate space for the signal handler context. */ if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack && SIGISMEMBER(psp->ps_sigonstack, sig)) { fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size); #if defined(COMPAT_43) td->td_sigstk.ss_flags |= SS_ONSTACK; #endif } else { fp = (struct sigframe *)td->td_frame->tf_sp; } /* Make room, keeping the stack aligned */ fp--; fp = (struct sigframe *)STACKALIGN(fp); /* Fill in the frame to copy out */ bzero(&frame, sizeof(frame)); get_mcontext(td, &frame.sf_uc.uc_mcontext, 0); frame.sf_si = ksi->ksi_info; frame.sf_uc.uc_sigmask = *mask; frame.sf_uc.uc_stack = td->td_sigstk; frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ? (onstack ? SS_ONSTACK : 0) : SS_DISABLE; mtx_unlock(&psp->ps_mtx); PROC_UNLOCK(td->td_proc); /* Copy the sigframe out to the user's stack. */ if (copyout(&frame, fp, sizeof(*fp)) != 0) { /* Process has trashed its stack. Kill it. */ CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp); PROC_LOCK(p); sigexit(td, SIGILL); } tf->tf_x[0]= sig; tf->tf_x[1] = (register_t)&fp->sf_si; tf->tf_x[2] = (register_t)&fp->sf_uc; tf->tf_elr = (register_t)catcher; tf->tf_sp = (register_t)fp; sysent = p->p_sysent; if (sysent->sv_sigcode_base != 0) tf->tf_lr = (register_t)sysent->sv_sigcode_base; else tf->tf_lr = (register_t)(sysent->sv_psstrings - *(sysent->sv_szsigcode)); CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_elr, tf->tf_sp); PROC_LOCK(p); mtx_lock(&psp->ps_mtx); } static void init_proc0(vm_offset_t kstack) { struct pcpu *pcpup = &__pcpu[0]; proc_linkup0(&proc0, &thread0); thread0.td_kstack = kstack; thread0.td_kstack_pages = KSTACK_PAGES; thread0.td_pcb = (struct pcb *)(thread0.td_kstack + thread0.td_kstack_pages * PAGE_SIZE) - 1; thread0.td_pcb->pcb_fpflags = 0; thread0.td_pcb->pcb_fpusaved = &thread0.td_pcb->pcb_fpustate; thread0.td_pcb->pcb_vfpcpu = UINT_MAX; thread0.td_frame = &proc0_tf; pcpup->pc_curpcb = thread0.td_pcb; } typedef struct { uint32_t type; uint64_t phys_start; uint64_t virt_start; uint64_t num_pages; uint64_t attr; } EFI_MEMORY_DESCRIPTOR; typedef void (*efi_map_entry_cb)(struct efi_md *); static void foreach_efi_map_entry(struct efi_map_header *efihdr, efi_map_entry_cb cb) { struct efi_md *map, *p; size_t efisz; int ndesc, i; /* * Memory map data provided by UEFI via the GetMemoryMap * Boot Services API. */ efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf; map = (struct efi_md *)((uint8_t *)efihdr + efisz); if (efihdr->descriptor_size == 0) return; ndesc = efihdr->memory_size / efihdr->descriptor_size; for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p, efihdr->descriptor_size)) { cb(p); } } static void exclude_efi_map_entry(struct efi_md *p) { switch (p->md_type) { case EFI_MD_TYPE_CODE: case EFI_MD_TYPE_DATA: case EFI_MD_TYPE_BS_CODE: case EFI_MD_TYPE_BS_DATA: case EFI_MD_TYPE_FREE: /* * We're allowed to use any entry with these types. */ break; default: physmem_exclude_region(p->md_phys, p->md_pages * PAGE_SIZE, EXFLAG_NOALLOC); } } static void exclude_efi_map_entries(struct efi_map_header *efihdr) { foreach_efi_map_entry(efihdr, exclude_efi_map_entry); } static void add_efi_map_entry(struct efi_md *p) { switch (p->md_type) { case EFI_MD_TYPE_RT_DATA: /* * Runtime data will be excluded after the DMAP * region is created to stop it from being added * to phys_avail. */ case EFI_MD_TYPE_CODE: case EFI_MD_TYPE_DATA: case EFI_MD_TYPE_BS_CODE: case EFI_MD_TYPE_BS_DATA: case EFI_MD_TYPE_FREE: /* * We're allowed to use any entry with these types. */ physmem_hardware_region(p->md_phys, p->md_pages * PAGE_SIZE); break; } } static void add_efi_map_entries(struct efi_map_header *efihdr) { foreach_efi_map_entry(efihdr, add_efi_map_entry); } static void print_efi_map_entry(struct efi_md *p) { const char *type; static const char *types[] = { "Reserved", "LoaderCode", "LoaderData", "BootServicesCode", "BootServicesData", "RuntimeServicesCode", "RuntimeServicesData", "ConventionalMemory", "UnusableMemory", "ACPIReclaimMemory", "ACPIMemoryNVS", "MemoryMappedIO", "MemoryMappedIOPortSpace", "PalCode", "PersistentMemory" }; if (p->md_type < nitems(types)) type = types[p->md_type]; else type = ""; printf("%23s %012lx %12p %08lx ", type, p->md_phys, p->md_virt, p->md_pages); if (p->md_attr & EFI_MD_ATTR_UC) printf("UC "); if (p->md_attr & EFI_MD_ATTR_WC) printf("WC "); if (p->md_attr & EFI_MD_ATTR_WT) printf("WT "); if (p->md_attr & EFI_MD_ATTR_WB) printf("WB "); if (p->md_attr & EFI_MD_ATTR_UCE) printf("UCE "); if (p->md_attr & EFI_MD_ATTR_WP) printf("WP "); if (p->md_attr & EFI_MD_ATTR_RP) printf("RP "); if (p->md_attr & EFI_MD_ATTR_XP) printf("XP "); if (p->md_attr & EFI_MD_ATTR_NV) printf("NV "); if (p->md_attr & EFI_MD_ATTR_MORE_RELIABLE) printf("MORE_RELIABLE "); if (p->md_attr & EFI_MD_ATTR_RO) printf("RO "); if (p->md_attr & EFI_MD_ATTR_RT) printf("RUNTIME"); printf("\n"); } static void print_efi_map_entries(struct efi_map_header *efihdr) { printf("%23s %12s %12s %8s %4s\n", "Type", "Physical", "Virtual", "#Pages", "Attr"); foreach_efi_map_entry(efihdr, print_efi_map_entry); } #ifdef FDT static void try_load_dtb(caddr_t kmdp) { vm_offset_t dtbp; dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t); #if defined(FDT_DTB_STATIC) /* * In case the device tree blob was not retrieved (from metadata) try * to use the statically embedded one. */ if (dtbp == 0) dtbp = (vm_offset_t)&fdt_static_dtb; #endif if (dtbp == (vm_offset_t)NULL) { printf("ERROR loading DTB\n"); return; } if (OF_install(OFW_FDT, 0) == FALSE) panic("Cannot install FDT"); if (OF_init((void *)dtbp) != 0) panic("OF_init failed with the found device tree"); parse_fdt_bootargs(); } #endif static bool bus_probe(void) { bool has_acpi, has_fdt; char *order, *env; has_acpi = has_fdt = false; #ifdef FDT has_fdt = (OF_peer(0) != 0); #endif #ifdef DEV_ACPI has_acpi = (acpi_find_table(ACPI_SIG_SPCR) != 0); #endif env = kern_getenv("kern.cfg.order"); if (env != NULL) { order = env; while (order != NULL) { if (has_acpi && strncmp(order, "acpi", 4) == 0 && (order[4] == ',' || order[4] == '\0')) { arm64_bus_method = ARM64_BUS_ACPI; break; } if (has_fdt && strncmp(order, "fdt", 3) == 0 && (order[3] == ',' || order[3] == '\0')) { arm64_bus_method = ARM64_BUS_FDT; break; } order = strchr(order, ','); } freeenv(env); /* If we set the bus method it is valid */ if (arm64_bus_method != ARM64_BUS_NONE) return (true); } /* If no order or an invalid order was set use the default */ if (arm64_bus_method == ARM64_BUS_NONE) { if (has_fdt) arm64_bus_method = ARM64_BUS_FDT; else if (has_acpi) arm64_bus_method = ARM64_BUS_ACPI; } /* * If no option was set the default is valid, otherwise we are * setting one to get cninit() working, then calling panic to tell * the user about the invalid bus setup. */ return (env == NULL); } static void cache_setup(void) { int dczva_line_shift; uint32_t dczid_el0; identify_cache(READ_SPECIALREG(ctr_el0)); dczid_el0 = READ_SPECIALREG(dczid_el0); /* Check if dc zva is not prohibited */ if (dczid_el0 & DCZID_DZP) dczva_line_size = 0; else { /* Same as with above calculations */ dczva_line_shift = DCZID_BS_SIZE(dczid_el0); dczva_line_size = sizeof(int) << dczva_line_shift; /* Change pagezero function */ pagezero = pagezero_cache; } } int memory_mapping_mode(vm_paddr_t pa) { struct efi_md *map, *p; size_t efisz; int ndesc, i; if (efihdr == NULL) return (VM_MEMATTR_WRITE_BACK); /* * Memory map data provided by UEFI via the GetMemoryMap * Boot Services API. */ efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf; map = (struct efi_md *)((uint8_t *)efihdr + efisz); if (efihdr->descriptor_size == 0) return (VM_MEMATTR_WRITE_BACK); ndesc = efihdr->memory_size / efihdr->descriptor_size; for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p, efihdr->descriptor_size)) { if (pa < p->md_phys || pa >= p->md_phys + p->md_pages * EFI_PAGE_SIZE) continue; if (p->md_type == EFI_MD_TYPE_IOMEM || p->md_type == EFI_MD_TYPE_IOPORT) return (VM_MEMATTR_DEVICE); else if ((p->md_attr & EFI_MD_ATTR_WB) != 0 || p->md_type == EFI_MD_TYPE_RECLAIM) return (VM_MEMATTR_WRITE_BACK); else if ((p->md_attr & EFI_MD_ATTR_WT) != 0) return (VM_MEMATTR_WRITE_THROUGH); else if ((p->md_attr & EFI_MD_ATTR_WC) != 0) return (VM_MEMATTR_WRITE_COMBINING); break; } return (VM_MEMATTR_DEVICE); } void initarm(struct arm64_bootparams *abp) { struct efi_fb *efifb; struct pcpu *pcpup; char *env; #ifdef FDT struct mem_region mem_regions[FDT_MEM_REGIONS]; int mem_regions_sz; #endif vm_offset_t lastaddr; caddr_t kmdp; bool valid; boot_el = abp->boot_el; /* Parse loader or FDT boot parametes. Determine last used address. */ lastaddr = parse_boot_param(abp); /* Find the kernel address */ kmdp = preload_search_by_type("elf kernel"); if (kmdp == NULL) kmdp = preload_search_by_type("elf64 kernel"); identify_cpu(0); update_special_regs(0); link_elf_ireloc(kmdp); try_load_dtb(kmdp); efi_systbl_phys = MD_FETCH(kmdp, MODINFOMD_FW_HANDLE, vm_paddr_t); /* Load the physical memory ranges */ efihdr = (struct efi_map_header *)preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_EFI_MAP); if (efihdr != NULL) add_efi_map_entries(efihdr); #ifdef FDT else { /* Grab physical memory regions information from device tree. */ if (fdt_get_mem_regions(mem_regions, &mem_regions_sz, NULL) != 0) panic("Cannot get physical memory regions"); physmem_hardware_regions(mem_regions, mem_regions_sz); } if (fdt_get_reserved_mem(mem_regions, &mem_regions_sz) == 0) physmem_exclude_regions(mem_regions, mem_regions_sz, EXFLAG_NODUMP | EXFLAG_NOALLOC); #endif /* Exclude the EFI framebuffer from our view of physical memory. */ efifb = (struct efi_fb *)preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_EFI_FB); if (efifb != NULL) physmem_exclude_region(efifb->fb_addr, efifb->fb_size, EXFLAG_NOALLOC); /* Set the pcpu data, this is needed by pmap_bootstrap */ pcpup = &__pcpu[0]; pcpu_init(pcpup, 0, sizeof(struct pcpu)); /* * Set the pcpu pointer with a backup in tpidr_el1 to be * loaded when entering the kernel from userland. */ __asm __volatile( "mov x18, %0 \n" "msr tpidr_el1, %0" :: "r"(pcpup)); PCPU_SET(curthread, &thread0); PCPU_SET(midr, get_midr()); /* Do basic tuning, hz etc */ init_param1(); cache_setup(); pan_setup(); /* Bootstrap enough of pmap to enter the kernel proper */ pmap_bootstrap(abp->kern_l0pt, abp->kern_l1pt, KERNBASE - abp->kern_delta, lastaddr - KERNBASE); /* Exclude entries neexed in teh DMAP region, but not phys_avail */ if (efihdr != NULL) exclude_efi_map_entries(efihdr); physmem_init_kernel_globals(); devmap_bootstrap(0, NULL); valid = bus_probe(); cninit(); if (!valid) panic("Invalid bus configuration: %s", kern_getenv("kern.cfg.order")); init_proc0(abp->kern_stack); msgbufinit(msgbufp, msgbufsize); mutex_init(); init_param2(physmem); dbg_init(); kdb_init(); pan_enable(); kcsan_cpu_init(0); env = kern_getenv("kernelname"); if (env != NULL) strlcpy(kernelname, env, sizeof(kernelname)); if (boothowto & RB_VERBOSE) { print_efi_map_entries(efihdr); physmem_print_tables(); } early_boot = 0; } void dbg_init(void) { /* Clear OS lock */ WRITE_SPECIALREG(oslar_el1, 0); /* This permits DDB to use debug registers for watchpoints. */ dbg_monitor_init(); /* TODO: Eventually will need to initialize debug registers here. */ } #ifdef DDB #include DB_SHOW_COMMAND(specialregs, db_show_spregs) { #define PRINT_REG(reg) \ db_printf(__STRING(reg) " = %#016lx\n", READ_SPECIALREG(reg)) PRINT_REG(actlr_el1); PRINT_REG(afsr0_el1); PRINT_REG(afsr1_el1); PRINT_REG(aidr_el1); PRINT_REG(amair_el1); PRINT_REG(ccsidr_el1); PRINT_REG(clidr_el1); PRINT_REG(contextidr_el1); PRINT_REG(cpacr_el1); PRINT_REG(csselr_el1); PRINT_REG(ctr_el0); PRINT_REG(currentel); PRINT_REG(daif); PRINT_REG(dczid_el0); PRINT_REG(elr_el1); PRINT_REG(esr_el1); PRINT_REG(far_el1); #if 0 /* ARM64TODO: Enable VFP before reading floating-point registers */ PRINT_REG(fpcr); PRINT_REG(fpsr); #endif PRINT_REG(id_aa64afr0_el1); PRINT_REG(id_aa64afr1_el1); PRINT_REG(id_aa64dfr0_el1); PRINT_REG(id_aa64dfr1_el1); PRINT_REG(id_aa64isar0_el1); PRINT_REG(id_aa64isar1_el1); PRINT_REG(id_aa64pfr0_el1); PRINT_REG(id_aa64pfr1_el1); PRINT_REG(id_afr0_el1); PRINT_REG(id_dfr0_el1); PRINT_REG(id_isar0_el1); PRINT_REG(id_isar1_el1); PRINT_REG(id_isar2_el1); PRINT_REG(id_isar3_el1); PRINT_REG(id_isar4_el1); PRINT_REG(id_isar5_el1); PRINT_REG(id_mmfr0_el1); PRINT_REG(id_mmfr1_el1); PRINT_REG(id_mmfr2_el1); PRINT_REG(id_mmfr3_el1); #if 0 /* Missing from llvm */ PRINT_REG(id_mmfr4_el1); #endif PRINT_REG(id_pfr0_el1); PRINT_REG(id_pfr1_el1); PRINT_REG(isr_el1); PRINT_REG(mair_el1); PRINT_REG(midr_el1); PRINT_REG(mpidr_el1); PRINT_REG(mvfr0_el1); PRINT_REG(mvfr1_el1); PRINT_REG(mvfr2_el1); PRINT_REG(revidr_el1); PRINT_REG(sctlr_el1); PRINT_REG(sp_el0); PRINT_REG(spsel); PRINT_REG(spsr_el1); PRINT_REG(tcr_el1); PRINT_REG(tpidr_el0); PRINT_REG(tpidr_el1); PRINT_REG(tpidrro_el0); PRINT_REG(ttbr0_el1); PRINT_REG(ttbr1_el1); PRINT_REG(vbar_el1); #undef PRINT_REG } DB_SHOW_COMMAND(vtop, db_show_vtop) { uint64_t phys; if (have_addr) { phys = arm64_address_translate_s1e1r(addr); db_printf("EL1 physical address reg (read): 0x%016lx\n", phys); phys = arm64_address_translate_s1e1w(addr); db_printf("EL1 physical address reg (write): 0x%016lx\n", phys); phys = arm64_address_translate_s1e0r(addr); db_printf("EL0 physical address reg (read): 0x%016lx\n", phys); phys = arm64_address_translate_s1e0w(addr); db_printf("EL0 physical address reg (write): 0x%016lx\n", phys); } else db_printf("show vtop \n"); } #endif Index: head/sys/kern/link_elf.c =================================================================== --- head/sys/kern/link_elf.c (revision 362943) +++ head/sys/kern/link_elf.c (revision 362944) @@ -1,1928 +1,1942 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 1998-2000 Doug Rabson * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include "opt_ddb.h" #include "opt_gdb.h" #include #include #ifdef GPROF #include #endif #include #include #include #ifdef SPARSE_MAPPING #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef SPARSE_MAPPING #include #include #include #endif #include #include #include #include "linker_if.h" #define MAXSEGS 4 typedef struct elf_file { struct linker_file lf; /* Common fields */ int preloaded; /* Was file pre-loaded */ caddr_t address; /* Relocation address */ #ifdef SPARSE_MAPPING vm_object_t object; /* VM object to hold file pages */ #endif Elf_Dyn *dynamic; /* Symbol table etc. */ Elf_Hashelt nbuckets; /* DT_HASH info */ Elf_Hashelt nchains; const Elf_Hashelt *buckets; const Elf_Hashelt *chains; caddr_t hash; caddr_t strtab; /* DT_STRTAB */ int strsz; /* DT_STRSZ */ const Elf_Sym *symtab; /* DT_SYMTAB */ Elf_Addr *got; /* DT_PLTGOT */ const Elf_Rel *pltrel; /* DT_JMPREL */ int pltrelsize; /* DT_PLTRELSZ */ const Elf_Rela *pltrela; /* DT_JMPREL */ int pltrelasize; /* DT_PLTRELSZ */ const Elf_Rel *rel; /* DT_REL */ int relsize; /* DT_RELSZ */ const Elf_Rela *rela; /* DT_RELA */ int relasize; /* DT_RELASZ */ caddr_t modptr; const Elf_Sym *ddbsymtab; /* The symbol table we are using */ long ddbsymcnt; /* Number of symbols */ caddr_t ddbstrtab; /* String table */ long ddbstrcnt; /* number of bytes in string table */ caddr_t symbase; /* malloc'ed symbold base */ caddr_t strbase; /* malloc'ed string base */ caddr_t ctftab; /* CTF table */ long ctfcnt; /* number of bytes in CTF table */ caddr_t ctfoff; /* CTF offset table */ caddr_t typoff; /* Type offset table */ long typlen; /* Number of type entries. */ Elf_Addr pcpu_start; /* Pre-relocation pcpu set start. */ Elf_Addr pcpu_stop; /* Pre-relocation pcpu set stop. */ Elf_Addr pcpu_base; /* Relocated pcpu set address. */ #ifdef VIMAGE Elf_Addr vnet_start; /* Pre-relocation vnet set start. */ Elf_Addr vnet_stop; /* Pre-relocation vnet set stop. */ Elf_Addr vnet_base; /* Relocated vnet set address. */ #endif #ifdef GDB struct link_map gdb; /* hooks for gdb */ #endif } *elf_file_t; struct elf_set { Elf_Addr es_start; Elf_Addr es_stop; Elf_Addr es_base; TAILQ_ENTRY(elf_set) es_link; }; TAILQ_HEAD(elf_set_head, elf_set); #include static int link_elf_link_common_finish(linker_file_t); static int link_elf_link_preload(linker_class_t cls, const char *, linker_file_t *); static int link_elf_link_preload_finish(linker_file_t); static int link_elf_load_file(linker_class_t, const char *, linker_file_t *); static int link_elf_lookup_symbol(linker_file_t, const char *, c_linker_sym_t *); static int link_elf_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t *); static int link_elf_search_symbol(linker_file_t, caddr_t, c_linker_sym_t *, long *); static void link_elf_unload_file(linker_file_t); static void link_elf_unload_preload(linker_file_t); static int link_elf_lookup_set(linker_file_t, const char *, void ***, void ***, int *); static int link_elf_each_function_name(linker_file_t, int (*)(const char *, void *), void *); static int link_elf_each_function_nameval(linker_file_t, linker_function_nameval_callback_t, void *); static void link_elf_reloc_local(linker_file_t); static long link_elf_symtab_get(linker_file_t, const Elf_Sym **); static long link_elf_strtab_get(linker_file_t, caddr_t *); static int elf_lookup(linker_file_t, Elf_Size, int, Elf_Addr *); static kobj_method_t link_elf_methods[] = { KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol), KOBJMETHOD(linker_symbol_values, link_elf_symbol_values), KOBJMETHOD(linker_search_symbol, link_elf_search_symbol), KOBJMETHOD(linker_unload, link_elf_unload_file), KOBJMETHOD(linker_load_file, link_elf_load_file), KOBJMETHOD(linker_link_preload, link_elf_link_preload), KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish), KOBJMETHOD(linker_lookup_set, link_elf_lookup_set), KOBJMETHOD(linker_each_function_name, link_elf_each_function_name), KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval), KOBJMETHOD(linker_ctf_get, link_elf_ctf_get), KOBJMETHOD(linker_symtab_get, link_elf_symtab_get), KOBJMETHOD(linker_strtab_get, link_elf_strtab_get), KOBJMETHOD_END }; static struct linker_class link_elf_class = { #if ELF_TARG_CLASS == ELFCLASS32 "elf32", #else "elf64", #endif link_elf_methods, sizeof(struct elf_file) }; typedef int (*elf_reloc_fn)(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, elf_lookup_fn lookup); static int parse_dynamic(elf_file_t); static int relocate_file(elf_file_t); static int relocate_file1(elf_file_t ef, elf_lookup_fn lookup, elf_reloc_fn reloc, bool ifuncs); static int link_elf_preload_parse_symbols(elf_file_t); static struct elf_set_head set_pcpu_list; #ifdef VIMAGE static struct elf_set_head set_vnet_list; #endif static void elf_set_add(struct elf_set_head *list, Elf_Addr start, Elf_Addr stop, Elf_Addr base) { struct elf_set *set, *iter; set = malloc(sizeof(*set), M_LINKER, M_WAITOK); set->es_start = start; set->es_stop = stop; set->es_base = base; TAILQ_FOREACH(iter, list, es_link) { KASSERT((set->es_start < iter->es_start && set->es_stop < iter->es_stop) || (set->es_start > iter->es_start && set->es_stop > iter->es_stop), ("linker sets intersection: to insert: 0x%jx-0x%jx; inserted: 0x%jx-0x%jx", (uintmax_t)set->es_start, (uintmax_t)set->es_stop, (uintmax_t)iter->es_start, (uintmax_t)iter->es_stop)); if (iter->es_start > set->es_start) { TAILQ_INSERT_BEFORE(iter, set, es_link); break; } } if (iter == NULL) TAILQ_INSERT_TAIL(list, set, es_link); } static int elf_set_find(struct elf_set_head *list, Elf_Addr addr, Elf_Addr *start, Elf_Addr *base) { struct elf_set *set; TAILQ_FOREACH(set, list, es_link) { if (addr < set->es_start) return (0); if (addr < set->es_stop) { *start = set->es_start; *base = set->es_base; return (1); } } return (0); } static void elf_set_delete(struct elf_set_head *list, Elf_Addr start) { struct elf_set *set; TAILQ_FOREACH(set, list, es_link) { if (start < set->es_start) break; if (start == set->es_start) { TAILQ_REMOVE(list, set, es_link); free(set, M_LINKER); return; } } KASSERT(0, ("deleting unknown linker set (start = 0x%jx)", (uintmax_t)start)); } #ifdef GDB static void r_debug_state(struct r_debug *, struct link_map *); /* * A list of loaded modules for GDB to use for loading symbols. */ struct r_debug r_debug; #define GDB_STATE(s) do { \ r_debug.r_state = s; r_debug_state(NULL, NULL); \ } while (0) /* * Function for the debugger to set a breakpoint on to gain control. */ static void r_debug_state(struct r_debug *dummy_one __unused, struct link_map *dummy_two __unused) { } static void link_elf_add_gdb(struct link_map *l) { struct link_map *prev; l->l_next = NULL; if (r_debug.r_map == NULL) { /* Add first. */ l->l_prev = NULL; r_debug.r_map = l; } else { /* Append to list. */ for (prev = r_debug.r_map; prev->l_next != NULL; prev = prev->l_next) ; l->l_prev = prev; prev->l_next = l; } } static void link_elf_delete_gdb(struct link_map *l) { if (l->l_prev == NULL) { /* Remove first. */ if ((r_debug.r_map = l->l_next) != NULL) l->l_next->l_prev = NULL; } else { /* Remove any but first. */ if ((l->l_prev->l_next = l->l_next) != NULL) l->l_next->l_prev = l->l_prev; } } #endif /* GDB */ /* * The kernel symbol table starts here. */ extern struct _dynamic _DYNAMIC; static void link_elf_error(const char *filename, const char *s) { if (filename == NULL) printf("kldload: %s\n", s); else printf("kldload: %s: %s\n", filename, s); } static void link_elf_invoke_ctors(caddr_t addr, size_t size) { void (**ctor)(void); size_t i, cnt; if (addr == NULL || size == 0) return; cnt = size / sizeof(*ctor); ctor = (void *)addr; for (i = 0; i < cnt; i++) { if (ctor[i] != NULL) (*ctor[i])(); } } /* * Actions performed after linking/loading both the preloaded kernel and any * modules; whether preloaded or dynamicly loaded. */ static int link_elf_link_common_finish(linker_file_t lf) { #ifdef GDB elf_file_t ef = (elf_file_t)lf; char *newfilename; #endif int error; /* Notify MD code that a module is being loaded. */ error = elf_cpu_load_file(lf); if (error != 0) return (error); #ifdef GDB GDB_STATE(RT_ADD); ef->gdb.l_addr = lf->address; newfilename = malloc(strlen(lf->filename) + 1, M_LINKER, M_WAITOK); strcpy(newfilename, lf->filename); ef->gdb.l_name = newfilename; ef->gdb.l_ld = ef->dynamic; link_elf_add_gdb(&ef->gdb); GDB_STATE(RT_CONSISTENT); #endif /* Invoke .ctors */ link_elf_invoke_ctors(lf->ctors_addr, lf->ctors_size); return (0); } #ifdef RELOCATABLE_KERNEL /* * __startkernel and __endkernel are symbols set up as relocation canaries. * * They are defined in locore to reference linker script symbols at the * beginning and end of the LOAD area. This has the desired side effect of * giving us variables that have relative relocations pointing at them, so * relocation of the kernel object will cause the variables to be updated * automatically by the runtime linker when we initialize. * * There are two main reasons to relocate the kernel: * 1) If the loader needed to load the kernel at an alternate load address. * 2) If the kernel is switching address spaces on machines like POWER9 * under Radix where the high bits of the effective address are used to * differentiate between hypervisor, host, guest, and problem state. */ extern vm_offset_t __startkernel, __endkernel; #endif static unsigned long kern_relbase = KERNBASE; SYSCTL_ULONG(_kern, OID_AUTO, base_address, CTLFLAG_RD, SYSCTL_NULL_ULONG_PTR, KERNBASE, "Kernel base address"); SYSCTL_ULONG(_kern, OID_AUTO, relbase_address, CTLFLAG_RD, &kern_relbase, 0, "Kernel relocated base address"); static void link_elf_init(void* arg) { Elf_Dyn *dp; Elf_Addr *ctors_addrp; Elf_Size *ctors_sizep; caddr_t modptr, baseptr, sizeptr; elf_file_t ef; const char *modname; linker_add_class(&link_elf_class); dp = (Elf_Dyn *)&_DYNAMIC; modname = NULL; modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel"); if (modptr == NULL) modptr = preload_search_by_type("elf kernel"); modname = (char *)preload_search_info(modptr, MODINFO_NAME); if (modname == NULL) modname = "kernel"; linker_kernel_file = linker_make_file(modname, &link_elf_class); if (linker_kernel_file == NULL) panic("%s: Can't create linker structures for kernel", __func__); ef = (elf_file_t) linker_kernel_file; ef->preloaded = 1; #ifdef RELOCATABLE_KERNEL /* Compute relative displacement */ ef->address = (caddr_t) (__startkernel - KERNBASE); #else ef->address = 0; #endif #ifdef SPARSE_MAPPING ef->object = NULL; #endif ef->dynamic = dp; if (dp != NULL) parse_dynamic(ef); #ifdef RELOCATABLE_KERNEL linker_kernel_file->address = (caddr_t)__startkernel; linker_kernel_file->size = (intptr_t)(__endkernel - __startkernel); kern_relbase = (unsigned long)__startkernel; #else linker_kernel_file->address += KERNBASE; linker_kernel_file->size = -(intptr_t)linker_kernel_file->address; #endif if (modptr != NULL) { ef->modptr = modptr; baseptr = preload_search_info(modptr, MODINFO_ADDR); if (baseptr != NULL) linker_kernel_file->address = *(caddr_t *)baseptr; sizeptr = preload_search_info(modptr, MODINFO_SIZE); if (sizeptr != NULL) linker_kernel_file->size = *(size_t *)sizeptr; ctors_addrp = (Elf_Addr *)preload_search_info(modptr, MODINFO_METADATA | MODINFOMD_CTORS_ADDR); ctors_sizep = (Elf_Size *)preload_search_info(modptr, MODINFO_METADATA | MODINFOMD_CTORS_SIZE); if (ctors_addrp != NULL && ctors_sizep != NULL) { linker_kernel_file->ctors_addr = ef->address + *ctors_addrp; linker_kernel_file->ctors_size = *ctors_sizep; } } (void)link_elf_preload_parse_symbols(ef); #ifdef GDB r_debug.r_map = NULL; r_debug.r_brk = r_debug_state; r_debug.r_state = RT_CONSISTENT; #endif (void)link_elf_link_common_finish(linker_kernel_file); linker_kernel_file->flags |= LINKER_FILE_LINKED; TAILQ_INIT(&set_pcpu_list); #ifdef VIMAGE TAILQ_INIT(&set_vnet_list); #endif } SYSINIT(link_elf, SI_SUB_KLD, SI_ORDER_THIRD, link_elf_init, NULL); static int link_elf_preload_parse_symbols(elf_file_t ef) { caddr_t pointer; caddr_t ssym, esym, base; caddr_t strtab; int strcnt; Elf_Sym *symtab; int symcnt; if (ef->modptr == NULL) return (0); pointer = preload_search_info(ef->modptr, MODINFO_METADATA | MODINFOMD_SSYM); if (pointer == NULL) return (0); ssym = *(caddr_t *)pointer; pointer = preload_search_info(ef->modptr, MODINFO_METADATA | MODINFOMD_ESYM); if (pointer == NULL) return (0); esym = *(caddr_t *)pointer; base = ssym; symcnt = *(long *)base; base += sizeof(long); symtab = (Elf_Sym *)base; base += roundup(symcnt, sizeof(long)); if (base > esym || base < ssym) { printf("Symbols are corrupt!\n"); return (EINVAL); } strcnt = *(long *)base; base += sizeof(long); strtab = base; base += roundup(strcnt, sizeof(long)); if (base > esym || base < ssym) { printf("Symbols are corrupt!\n"); return (EINVAL); } ef->ddbsymtab = symtab; ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); ef->ddbstrtab = strtab; ef->ddbstrcnt = strcnt; return (0); } static int parse_dynamic(elf_file_t ef) { Elf_Dyn *dp; int plttype = DT_REL; for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) { switch (dp->d_tag) { case DT_HASH: { /* From src/libexec/rtld-elf/rtld.c */ const Elf_Hashelt *hashtab = (const Elf_Hashelt *) (ef->address + dp->d_un.d_ptr); ef->nbuckets = hashtab[0]; ef->nchains = hashtab[1]; ef->buckets = hashtab + 2; ef->chains = ef->buckets + ef->nbuckets; break; } case DT_STRTAB: ef->strtab = (caddr_t) (ef->address + dp->d_un.d_ptr); break; case DT_STRSZ: ef->strsz = dp->d_un.d_val; break; case DT_SYMTAB: ef->symtab = (Elf_Sym*) (ef->address + dp->d_un.d_ptr); break; case DT_SYMENT: if (dp->d_un.d_val != sizeof(Elf_Sym)) return (ENOEXEC); break; case DT_PLTGOT: ef->got = (Elf_Addr *) (ef->address + dp->d_un.d_ptr); break; case DT_REL: ef->rel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr); break; case DT_RELSZ: ef->relsize = dp->d_un.d_val; break; case DT_RELENT: if (dp->d_un.d_val != sizeof(Elf_Rel)) return (ENOEXEC); break; case DT_JMPREL: ef->pltrel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr); break; case DT_PLTRELSZ: ef->pltrelsize = dp->d_un.d_val; break; case DT_RELA: ef->rela = (const Elf_Rela *) (ef->address + dp->d_un.d_ptr); break; case DT_RELASZ: ef->relasize = dp->d_un.d_val; break; case DT_RELAENT: if (dp->d_un.d_val != sizeof(Elf_Rela)) return (ENOEXEC); break; case DT_PLTREL: plttype = dp->d_un.d_val; if (plttype != DT_REL && plttype != DT_RELA) return (ENOEXEC); break; #ifdef GDB case DT_DEBUG: dp->d_un.d_ptr = (Elf_Addr)&r_debug; break; #endif } } if (plttype == DT_RELA) { ef->pltrela = (const Elf_Rela *)ef->pltrel; ef->pltrel = NULL; ef->pltrelasize = ef->pltrelsize; ef->pltrelsize = 0; } ef->ddbsymtab = ef->symtab; ef->ddbsymcnt = ef->nchains; ef->ddbstrtab = ef->strtab; ef->ddbstrcnt = ef->strsz; return elf_cpu_parse_dynamic(ef->address, ef->dynamic); } #define LS_PADDING 0x90909090 static int parse_dpcpu(elf_file_t ef) { int error, size; #if defined(__i386__) uint32_t pad; #endif ef->pcpu_start = 0; ef->pcpu_stop = 0; error = link_elf_lookup_set(&ef->lf, "pcpu", (void ***)&ef->pcpu_start, (void ***)&ef->pcpu_stop, NULL); /* Error just means there is no pcpu set to relocate. */ if (error != 0) return (0); size = (uintptr_t)ef->pcpu_stop - (uintptr_t)ef->pcpu_start; /* Empty set? */ if (size < 1) return (0); #if defined(__i386__) /* In case we do find __start/stop_set_ symbols double-check. */ if (size < 4) { uprintf("Kernel module '%s' must be recompiled with " "linker script\n", ef->lf.pathname); return (ENOEXEC); } /* Padding from linker-script correct? */ pad = *(uint32_t *)((uintptr_t)ef->pcpu_stop - sizeof(pad)); if (pad != LS_PADDING) { uprintf("Kernel module '%s' must be recompiled with " "linker script, invalid padding %#04x (%#04x)\n", ef->lf.pathname, pad, LS_PADDING); return (ENOEXEC); } /* If we only have valid padding, nothing to do. */ if (size == 4) return (0); #endif /* * Allocate space in the primary pcpu area. Copy in our * initialization from the data section and then initialize * all per-cpu storage from that. */ ef->pcpu_base = (Elf_Addr)(uintptr_t)dpcpu_alloc(size); if (ef->pcpu_base == 0) { printf("%s: pcpu module space is out of space; " "cannot allocate %d for %s\n", __func__, size, ef->lf.pathname); return (ENOSPC); } memcpy((void *)ef->pcpu_base, (void *)ef->pcpu_start, size); dpcpu_copy((void *)ef->pcpu_base, size); elf_set_add(&set_pcpu_list, ef->pcpu_start, ef->pcpu_stop, ef->pcpu_base); return (0); } #ifdef VIMAGE static int parse_vnet(elf_file_t ef) { int error, size; #if defined(__i386__) uint32_t pad; #endif ef->vnet_start = 0; ef->vnet_stop = 0; error = link_elf_lookup_set(&ef->lf, "vnet", (void ***)&ef->vnet_start, (void ***)&ef->vnet_stop, NULL); /* Error just means there is no vnet data set to relocate. */ if (error != 0) return (0); size = (uintptr_t)ef->vnet_stop - (uintptr_t)ef->vnet_start; /* Empty set? */ if (size < 1) return (0); #if defined(__i386__) /* In case we do find __start/stop_set_ symbols double-check. */ if (size < 4) { uprintf("Kernel module '%s' must be recompiled with " "linker script\n", ef->lf.pathname); return (ENOEXEC); } /* Padding from linker-script correct? */ pad = *(uint32_t *)((uintptr_t)ef->vnet_stop - sizeof(pad)); if (pad != LS_PADDING) { uprintf("Kernel module '%s' must be recompiled with " "linker script, invalid padding %#04x (%#04x)\n", ef->lf.pathname, pad, LS_PADDING); return (ENOEXEC); } /* If we only have valid padding, nothing to do. */ if (size == 4) return (0); #endif /* * Allocate space in the primary vnet area. Copy in our * initialization from the data section and then initialize * all per-vnet storage from that. */ ef->vnet_base = (Elf_Addr)(uintptr_t)vnet_data_alloc(size); if (ef->vnet_base == 0) { printf("%s: vnet module space is out of space; " "cannot allocate %d for %s\n", __func__, size, ef->lf.pathname); return (ENOSPC); } memcpy((void *)ef->vnet_base, (void *)ef->vnet_start, size); vnet_data_copy((void *)ef->vnet_base, size); elf_set_add(&set_vnet_list, ef->vnet_start, ef->vnet_stop, ef->vnet_base); return (0); } #endif #undef LS_PADDING /* * Apply the specified protection to the loadable segments of a preloaded linker * file. */ static int preload_protect(elf_file_t ef, vm_prot_t prot) { #ifdef __amd64__ Elf_Ehdr *hdr; Elf_Phdr *phdr, *phlimit; vm_prot_t nprot; int error; error = 0; hdr = (Elf_Ehdr *)ef->address; phdr = (Elf_Phdr *)(ef->address + hdr->e_phoff); phlimit = phdr + hdr->e_phnum; for (; phdr < phlimit; phdr++) { if (phdr->p_type != PT_LOAD) continue; nprot = prot | VM_PROT_READ; if ((phdr->p_flags & PF_W) != 0) nprot |= VM_PROT_WRITE; if ((phdr->p_flags & PF_X) != 0) nprot |= VM_PROT_EXECUTE; error = pmap_change_prot((vm_offset_t)ef->address + phdr->p_vaddr, round_page(phdr->p_memsz), nprot); if (error != 0) break; } return (error); #else return (0); #endif } #ifdef __arm__ /* * Locate the ARM exception/unwind table info for DDB and stack(9) use by * searching for the section header that describes it. There may be no unwind * info, for example in a module containing only data. */ static void link_elf_locate_exidx(linker_file_t lf, Elf_Shdr *shdr, int nhdr) { int i; for (i = 0; i < nhdr; i++) { if (shdr[i].sh_type == SHT_ARM_EXIDX) { lf->exidx_addr = shdr[i].sh_addr + lf->address; lf->exidx_size = shdr[i].sh_size; break; } } } /* * Locate the section headers metadata in a preloaded module, then use it to * locate the exception/unwind table in the module. The size of the metadata * block is stored in a uint32 word immediately before the data itself, and a * comment in preload_search_info() says it is safe to rely on that. */ static void link_elf_locate_exidx_preload(struct linker_file *lf, caddr_t modptr) { uint32_t *modinfo; Elf_Shdr *shdr; uint32_t nhdr; modinfo = (uint32_t *)preload_search_info(modptr, MODINFO_METADATA | MODINFOMD_SHDR); if (modinfo != NULL) { shdr = (Elf_Shdr *)modinfo; nhdr = modinfo[-1] / sizeof(Elf_Shdr); link_elf_locate_exidx(lf, shdr, nhdr); } } #endif /* __arm__ */ static int link_elf_link_preload(linker_class_t cls, const char *filename, linker_file_t *result) { Elf_Addr *ctors_addrp; Elf_Size *ctors_sizep; caddr_t modptr, baseptr, sizeptr, dynptr; char *type; elf_file_t ef; linker_file_t lf; int error; vm_offset_t dp; /* Look to see if we have the file preloaded */ modptr = preload_search_by_name(filename); if (modptr == NULL) return (ENOENT); type = (char *)preload_search_info(modptr, MODINFO_TYPE); baseptr = preload_search_info(modptr, MODINFO_ADDR); sizeptr = preload_search_info(modptr, MODINFO_SIZE); dynptr = preload_search_info(modptr, MODINFO_METADATA | MODINFOMD_DYNAMIC); if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " module") != 0 && strcmp(type, "elf module") != 0)) return (EFTYPE); if (baseptr == NULL || sizeptr == NULL || dynptr == NULL) return (EINVAL); lf = linker_make_file(filename, &link_elf_class); if (lf == NULL) return (ENOMEM); ef = (elf_file_t) lf; ef->preloaded = 1; ef->modptr = modptr; ef->address = *(caddr_t *)baseptr; #ifdef SPARSE_MAPPING ef->object = NULL; #endif dp = (vm_offset_t)ef->address + *(vm_offset_t *)dynptr; ef->dynamic = (Elf_Dyn *)dp; lf->address = ef->address; lf->size = *(size_t *)sizeptr; ctors_addrp = (Elf_Addr *)preload_search_info(modptr, MODINFO_METADATA | MODINFOMD_CTORS_ADDR); ctors_sizep = (Elf_Size *)preload_search_info(modptr, MODINFO_METADATA | MODINFOMD_CTORS_SIZE); if (ctors_addrp != NULL && ctors_sizep != NULL) { lf->ctors_addr = ef->address + *ctors_addrp; lf->ctors_size = *ctors_sizep; } #ifdef __arm__ link_elf_locate_exidx_preload(lf, modptr); #endif error = parse_dynamic(ef); if (error == 0) error = parse_dpcpu(ef); #ifdef VIMAGE if (error == 0) error = parse_vnet(ef); #endif if (error == 0) error = preload_protect(ef, VM_PROT_ALL); if (error != 0) { linker_file_unload(lf, LINKER_UNLOAD_FORCE); return (error); } link_elf_reloc_local(lf); *result = lf; return (0); } static int link_elf_link_preload_finish(linker_file_t lf) { elf_file_t ef; int error; ef = (elf_file_t) lf; error = relocate_file(ef); if (error == 0) error = preload_protect(ef, VM_PROT_NONE); if (error != 0) return (error); (void)link_elf_preload_parse_symbols(ef); return (link_elf_link_common_finish(lf)); } static int link_elf_load_file(linker_class_t cls, const char* filename, linker_file_t* result) { struct nameidata nd; struct thread* td = curthread; /* XXX */ Elf_Ehdr *hdr; caddr_t firstpage, segbase; int nbytes, i; Elf_Phdr *phdr; Elf_Phdr *phlimit; Elf_Phdr *segs[MAXSEGS]; int nsegs; Elf_Phdr *phdyn; caddr_t mapbase; size_t mapsize; Elf_Addr base_vaddr; Elf_Addr base_vlimit; int error = 0; ssize_t resid; int flags; elf_file_t ef; linker_file_t lf; Elf_Shdr *shdr; int symtabindex; int symstrindex; int shstrindex; int symcnt; int strcnt; char *shstrs; shdr = NULL; lf = NULL; shstrs = NULL; NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, td); flags = FREAD; error = vn_open(&nd, &flags, 0, NULL); if (error != 0) return (error); NDFREE(&nd, NDF_ONLY_PNBUF); if (nd.ni_vp->v_type != VREG) { error = ENOEXEC; firstpage = NULL; goto out; } #ifdef MAC error = mac_kld_check_load(curthread->td_ucred, nd.ni_vp); if (error != 0) { firstpage = NULL; goto out; } #endif /* * Read the elf header from the file. */ firstpage = malloc(PAGE_SIZE, M_LINKER, M_WAITOK); hdr = (Elf_Ehdr *)firstpage; error = vn_rdwr(UIO_READ, nd.ni_vp, firstpage, PAGE_SIZE, 0, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); nbytes = PAGE_SIZE - resid; if (error != 0) goto out; if (!IS_ELF(*hdr)) { error = ENOEXEC; goto out; } if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { link_elf_error(filename, "Unsupported file layout"); error = ENOEXEC; goto out; } if (hdr->e_ident[EI_VERSION] != EV_CURRENT || hdr->e_version != EV_CURRENT) { link_elf_error(filename, "Unsupported file version"); error = ENOEXEC; goto out; } if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) { error = ENOSYS; goto out; } if (hdr->e_machine != ELF_TARG_MACH) { link_elf_error(filename, "Unsupported machine"); error = ENOEXEC; goto out; } /* * We rely on the program header being in the first page. * This is not strictly required by the ABI specification, but * it seems to always true in practice. And, it simplifies * things considerably. */ if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) && (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) && (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes))) link_elf_error(filename, "Unreadable program headers"); /* * Scan the program header entries, and save key information. * * We rely on there being exactly two load segments, text and data, * in that order. */ phdr = (Elf_Phdr *) (firstpage + hdr->e_phoff); phlimit = phdr + hdr->e_phnum; nsegs = 0; phdyn = NULL; while (phdr < phlimit) { switch (phdr->p_type) { case PT_LOAD: if (nsegs == MAXSEGS) { link_elf_error(filename, "Too many sections"); error = ENOEXEC; goto out; } /* * XXX: We just trust they come in right order ?? */ segs[nsegs] = phdr; ++nsegs; break; case PT_DYNAMIC: phdyn = phdr; break; case PT_INTERP: error = ENOSYS; goto out; } ++phdr; } if (phdyn == NULL) { link_elf_error(filename, "Object is not dynamically-linked"); error = ENOEXEC; goto out; } if (nsegs == 0) { link_elf_error(filename, "No sections"); error = ENOEXEC; goto out; } /* * Allocate the entire address space of the object, to stake * out our contiguous region, and to establish the base * address for relocation. */ base_vaddr = trunc_page(segs[0]->p_vaddr); base_vlimit = round_page(segs[nsegs - 1]->p_vaddr + segs[nsegs - 1]->p_memsz); mapsize = base_vlimit - base_vaddr; lf = linker_make_file(filename, &link_elf_class); if (lf == NULL) { error = ENOMEM; goto out; } ef = (elf_file_t) lf; #ifdef SPARSE_MAPPING ef->object = vm_object_allocate(OBJT_PHYS, atop(mapsize)); if (ef->object == NULL) { error = ENOMEM; goto out; } #ifdef __amd64__ mapbase = (caddr_t)KERNBASE; #else mapbase = (caddr_t)vm_map_min(kernel_map); #endif /* * Mapping protections are downgraded after relocation processing. */ error = vm_map_find(kernel_map, ef->object, 0, (vm_offset_t *)&mapbase, mapsize, 0, VMFS_OPTIMAL_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0); if (error != 0) { vm_object_deallocate(ef->object); ef->object = NULL; goto out; } #else mapbase = malloc(mapsize, M_LINKER, M_EXEC | M_WAITOK); #endif ef->address = mapbase; /* * Read the text and data sections and zero the bss. */ for (i = 0; i < nsegs; i++) { segbase = mapbase + segs[i]->p_vaddr - base_vaddr; #ifdef SPARSE_MAPPING /* * Consecutive segments may have different mapping permissions, * so be strict and verify that their mappings do not overlap. */ if (((vm_offset_t)segbase & PAGE_MASK) != 0) { error = EINVAL; goto out; } error = vm_map_wire(kernel_map, (vm_offset_t)segbase, (vm_offset_t)segbase + round_page(segs[i]->p_memsz), VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES); if (error != KERN_SUCCESS) { error = ENOMEM; goto out; } #endif error = vn_rdwr(UIO_READ, nd.ni_vp, segbase, segs[i]->p_filesz, segs[i]->p_offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); if (error != 0) goto out; bzero(segbase + segs[i]->p_filesz, segs[i]->p_memsz - segs[i]->p_filesz); } #ifdef GPROF /* Update profiling information with the new text segment. */ mtx_lock(&Giant); kmupetext((uintfptr_t)(mapbase + segs[0]->p_vaddr - base_vaddr + segs[0]->p_memsz)); mtx_unlock(&Giant); #endif ef->dynamic = (Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr); lf->address = ef->address; lf->size = mapsize; error = parse_dynamic(ef); if (error != 0) goto out; error = parse_dpcpu(ef); if (error != 0) goto out; #ifdef VIMAGE error = parse_vnet(ef); if (error != 0) goto out; #endif link_elf_reloc_local(lf); VOP_UNLOCK(nd.ni_vp); error = linker_load_dependencies(lf); vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); if (error != 0) goto out; error = relocate_file(ef); if (error != 0) goto out; #ifdef SPARSE_MAPPING /* * Downgrade permissions on text segment mappings now that relocation * processing is complete. Restrict permissions on read-only segments. */ for (i = 0; i < nsegs; i++) { vm_prot_t prot; if (segs[i]->p_type != PT_LOAD) continue; prot = VM_PROT_READ; if ((segs[i]->p_flags & PF_W) != 0) prot |= VM_PROT_WRITE; if ((segs[i]->p_flags & PF_X) != 0) prot |= VM_PROT_EXECUTE; segbase = mapbase + segs[i]->p_vaddr - base_vaddr; error = vm_map_protect(kernel_map, (vm_offset_t)segbase, (vm_offset_t)segbase + round_page(segs[i]->p_memsz), prot, FALSE); if (error != KERN_SUCCESS) { error = ENOMEM; goto out; } } #endif /* * Try and load the symbol table if it's present. (you can * strip it!) */ nbytes = hdr->e_shnum * hdr->e_shentsize; if (nbytes == 0 || hdr->e_shoff == 0) goto nosyms; shdr = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); if (error != 0) goto out; /* Read section string table */ shstrindex = hdr->e_shstrndx; if (shstrindex != 0 && shdr[shstrindex].sh_type == SHT_STRTAB && shdr[shstrindex].sh_size != 0) { nbytes = shdr[shstrindex].sh_size; shstrs = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shstrs, nbytes, shdr[shstrindex].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); if (error) goto out; } symtabindex = -1; symstrindex = -1; for (i = 0; i < hdr->e_shnum; i++) { if (shdr[i].sh_type == SHT_SYMTAB) { symtabindex = i; symstrindex = shdr[i].sh_link; } else if (shstrs != NULL && shdr[i].sh_name != 0 && strcmp(shstrs + shdr[i].sh_name, ".ctors") == 0) { /* Record relocated address and size of .ctors. */ lf->ctors_addr = mapbase + shdr[i].sh_addr - base_vaddr; lf->ctors_size = shdr[i].sh_size; } } if (symtabindex < 0 || symstrindex < 0) goto nosyms; symcnt = shdr[symtabindex].sh_size; ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK); strcnt = shdr[symstrindex].sh_size; ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK); error = vn_rdwr(UIO_READ, nd.ni_vp, ef->symbase, symcnt, shdr[symtabindex].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); if (error != 0) goto out; error = vn_rdwr(UIO_READ, nd.ni_vp, ef->strbase, strcnt, shdr[symstrindex].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); if (error != 0) goto out; ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); ef->ddbsymtab = (const Elf_Sym *)ef->symbase; ef->ddbstrcnt = strcnt; ef->ddbstrtab = ef->strbase; nosyms: #ifdef __arm__ link_elf_locate_exidx(lf, shdr, hdr->e_shnum); #endif error = link_elf_link_common_finish(lf); if (error != 0) goto out; *result = lf; out: VOP_UNLOCK(nd.ni_vp); vn_close(nd.ni_vp, FREAD, td->td_ucred, td); if (error != 0 && lf != NULL) linker_file_unload(lf, LINKER_UNLOAD_FORCE); free(shdr, M_LINKER); free(firstpage, M_LINKER); free(shstrs, M_LINKER); return (error); } Elf_Addr elf_relocaddr(linker_file_t lf, Elf_Addr x) { elf_file_t ef; KASSERT(lf->ops->cls == (kobj_class_t)&link_elf_class, ("elf_relocaddr: unexpected linker file %p", lf)); ef = (elf_file_t)lf; if (x >= ef->pcpu_start && x < ef->pcpu_stop) return ((x - ef->pcpu_start) + ef->pcpu_base); #ifdef VIMAGE if (x >= ef->vnet_start && x < ef->vnet_stop) return ((x - ef->vnet_start) + ef->vnet_base); #endif return (x); } static void link_elf_unload_file(linker_file_t file) { elf_file_t ef = (elf_file_t) file; if (ef->pcpu_base != 0) { dpcpu_free((void *)ef->pcpu_base, ef->pcpu_stop - ef->pcpu_start); elf_set_delete(&set_pcpu_list, ef->pcpu_start); } #ifdef VIMAGE if (ef->vnet_base != 0) { vnet_data_free((void *)ef->vnet_base, ef->vnet_stop - ef->vnet_start); elf_set_delete(&set_vnet_list, ef->vnet_start); } #endif #ifdef GDB if (ef->gdb.l_ld != NULL) { GDB_STATE(RT_DELETE); free((void *)(uintptr_t)ef->gdb.l_name, M_LINKER); link_elf_delete_gdb(&ef->gdb); GDB_STATE(RT_CONSISTENT); } #endif /* Notify MD code that a module is being unloaded. */ elf_cpu_unload_file(file); if (ef->preloaded) { link_elf_unload_preload(file); return; } #ifdef SPARSE_MAPPING if (ef->object != NULL) { vm_map_remove(kernel_map, (vm_offset_t) ef->address, (vm_offset_t) ef->address + (ef->object->size << PAGE_SHIFT)); } #else free(ef->address, M_LINKER); #endif free(ef->symbase, M_LINKER); free(ef->strbase, M_LINKER); free(ef->ctftab, M_LINKER); free(ef->ctfoff, M_LINKER); free(ef->typoff, M_LINKER); } static void link_elf_unload_preload(linker_file_t file) { if (file->pathname != NULL) preload_delete_name(file->pathname); } static const char * symbol_name(elf_file_t ef, Elf_Size r_info) { const Elf_Sym *ref; if (ELF_R_SYM(r_info)) { ref = ef->symtab + ELF_R_SYM(r_info); return (ef->strtab + ref->st_name); } return (NULL); } static int symbol_type(elf_file_t ef, Elf_Size r_info) { const Elf_Sym *ref; if (ELF_R_SYM(r_info)) { ref = ef->symtab + ELF_R_SYM(r_info); return (ELF_ST_TYPE(ref->st_info)); } return (STT_NOTYPE); } static int relocate_file1(elf_file_t ef, elf_lookup_fn lookup, elf_reloc_fn reloc, bool ifuncs) { const Elf_Rel *rel; const Elf_Rela *rela; const char *symname; #define APPLY_RELOCS(iter, tbl, tblsize, type) do { \ for ((iter) = (tbl); (iter) != NULL && \ (iter) < (tbl) + (tblsize) / sizeof(*(iter)); (iter)++) { \ if ((symbol_type(ef, (iter)->r_info) == \ STT_GNU_IFUNC || \ elf_is_ifunc_reloc((iter)->r_info)) != ifuncs) \ continue; \ if (reloc(&ef->lf, (Elf_Addr)ef->address, \ (iter), (type), lookup)) { \ symname = symbol_name(ef, (iter)->r_info); \ printf("link_elf: symbol %s undefined\n", \ symname); \ return (ENOENT); \ } \ } \ } while (0) APPLY_RELOCS(rel, ef->rel, ef->relsize, ELF_RELOC_REL); APPLY_RELOCS(rela, ef->rela, ef->relasize, ELF_RELOC_RELA); APPLY_RELOCS(rel, ef->pltrel, ef->pltrelsize, ELF_RELOC_REL); APPLY_RELOCS(rela, ef->pltrela, ef->pltrelasize, ELF_RELOC_RELA); #undef APPLY_RELOCS return (0); } static int relocate_file(elf_file_t ef) { int error; error = relocate_file1(ef, elf_lookup, elf_reloc, false); if (error == 0) error = relocate_file1(ef, elf_lookup, elf_reloc, true); return (error); } /* * Hash function for symbol table lookup. Don't even think about changing * this. It is specified by the System V ABI. */ static unsigned long elf_hash(const char *name) { const unsigned char *p = (const unsigned char *) name; unsigned long h = 0; unsigned long g; while (*p != '\0') { h = (h << 4) + *p++; if ((g = h & 0xf0000000) != 0) h ^= g >> 24; h &= ~g; } return (h); } static int link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) { elf_file_t ef = (elf_file_t) lf; unsigned long symnum; const Elf_Sym* symp; const char *strp; unsigned long hash; int i; /* If we don't have a hash, bail. */ if (ef->buckets == NULL || ef->nbuckets == 0) { printf("link_elf_lookup_symbol: missing symbol hash table\n"); return (ENOENT); } /* First, search hashed global symbols */ hash = elf_hash(name); symnum = ef->buckets[hash % ef->nbuckets]; while (symnum != STN_UNDEF) { if (symnum >= ef->nchains) { printf("%s: corrupt symbol table\n", __func__); return (ENOENT); } symp = ef->symtab + symnum; if (symp->st_name == 0) { printf("%s: corrupt symbol table\n", __func__); return (ENOENT); } strp = ef->strtab + symp->st_name; if (strcmp(name, strp) == 0) { if (symp->st_shndx != SHN_UNDEF || (symp->st_value != 0 && (ELF_ST_TYPE(symp->st_info) == STT_FUNC || ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) { *sym = (c_linker_sym_t) symp; return (0); } return (ENOENT); } symnum = ef->chains[symnum]; } /* If we have not found it, look at the full table (if loaded) */ if (ef->symtab == ef->ddbsymtab) return (ENOENT); /* Exhaustive search */ for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { strp = ef->ddbstrtab + symp->st_name; if (strcmp(name, strp) == 0) { if (symp->st_shndx != SHN_UNDEF || (symp->st_value != 0 && (ELF_ST_TYPE(symp->st_info) == STT_FUNC || ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) { *sym = (c_linker_sym_t) symp; return (0); } return (ENOENT); } } return (ENOENT); } static int link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, linker_symval_t *symval) { elf_file_t ef; const Elf_Sym *es; caddr_t val; ef = (elf_file_t)lf; es = (const Elf_Sym *)sym; if (es >= ef->symtab && es < (ef->symtab + ef->nchains)) { symval->name = ef->strtab + es->st_name; val = (caddr_t)ef->address + es->st_value; if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC) val = ((caddr_t (*)(void))val)(); symval->value = val; symval->size = es->st_size; return (0); } if (ef->symtab == ef->ddbsymtab) return (ENOENT); if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { symval->name = ef->ddbstrtab + es->st_name; val = (caddr_t)ef->address + es->st_value; if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC) val = ((caddr_t (*)(void))val)(); symval->value = val; symval->size = es->st_size; return (0); } return (ENOENT); } static int link_elf_search_symbol(linker_file_t lf, caddr_t value, c_linker_sym_t *sym, long *diffp) { elf_file_t ef = (elf_file_t) lf; u_long off = (uintptr_t) (void *) value; u_long diff = off; u_long st_value; const Elf_Sym* es; const Elf_Sym* best = NULL; int i; for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { if (es->st_name == 0) continue; st_value = es->st_value + (uintptr_t) (void *) ef->address; if (off >= st_value) { if (off - st_value < diff) { diff = off - st_value; best = es; if (diff == 0) break; } else if (off - st_value == diff) { best = es; } } } if (best == NULL) *diffp = off; else *diffp = diff; *sym = (c_linker_sym_t) best; return (0); } /* * Look up a linker set on an ELF system. */ static int link_elf_lookup_set(linker_file_t lf, const char *name, void ***startp, void ***stopp, int *countp) { c_linker_sym_t sym; linker_symval_t symval; char *setsym; void **start, **stop; int len, error = 0, count; len = strlen(name) + sizeof("__start_set_"); /* sizeof includes \0 */ setsym = malloc(len, M_LINKER, M_WAITOK); /* get address of first entry */ snprintf(setsym, len, "%s%s", "__start_set_", name); error = link_elf_lookup_symbol(lf, setsym, &sym); if (error != 0) goto out; link_elf_symbol_values(lf, sym, &symval); if (symval.value == 0) { error = ESRCH; goto out; } start = (void **)symval.value; /* get address of last entry */ snprintf(setsym, len, "%s%s", "__stop_set_", name); error = link_elf_lookup_symbol(lf, setsym, &sym); if (error != 0) goto out; link_elf_symbol_values(lf, sym, &symval); if (symval.value == 0) { error = ESRCH; goto out; } stop = (void **)symval.value; /* and the number of entries */ count = stop - start; /* and copy out */ if (startp != NULL) *startp = start; if (stopp != NULL) *stopp = stop; if (countp != NULL) *countp = count; out: free(setsym, M_LINKER); return (error); } static int link_elf_each_function_name(linker_file_t file, int (*callback)(const char *, void *), void *opaque) { elf_file_t ef = (elf_file_t)file; const Elf_Sym *symp; int i, error; /* Exhaustive search */ for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { if (symp->st_value != 0 && (ELF_ST_TYPE(symp->st_info) == STT_FUNC || ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { error = callback(ef->ddbstrtab + symp->st_name, opaque); if (error != 0) return (error); } } return (0); } static int link_elf_each_function_nameval(linker_file_t file, linker_function_nameval_callback_t callback, void *opaque) { linker_symval_t symval; elf_file_t ef = (elf_file_t)file; const Elf_Sym* symp; int i, error; /* Exhaustive search */ for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { if (symp->st_value != 0 && (ELF_ST_TYPE(symp->st_info) == STT_FUNC || ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval); if (error != 0) return (error); error = callback(file, i, &symval, opaque); if (error != 0) return (error); } } return (0); } const Elf_Sym * elf_get_sym(linker_file_t lf, Elf_Size symidx) { elf_file_t ef = (elf_file_t)lf; if (symidx >= ef->nchains) return (NULL); return (ef->symtab + symidx); } const char * elf_get_symname(linker_file_t lf, Elf_Size symidx) { elf_file_t ef = (elf_file_t)lf; const Elf_Sym *sym; if (symidx >= ef->nchains) return (NULL); sym = ef->symtab + symidx; return (ef->strtab + sym->st_name); } /* * Symbol lookup function that can be used when the symbol index is known (ie * in relocations). It uses the symbol index instead of doing a fully fledged * hash table based lookup when such is valid. For example for local symbols. * This is not only more efficient, it's also more correct. It's not always * the case that the symbol can be found through the hash table. */ static int elf_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res) { elf_file_t ef = (elf_file_t)lf; const Elf_Sym *sym; const char *symbol; Elf_Addr addr, start, base; /* Don't even try to lookup the symbol if the index is bogus. */ if (symidx >= ef->nchains) { *res = 0; return (EINVAL); } sym = ef->symtab + symidx; /* * Don't do a full lookup when the symbol is local. It may even * fail because it may not be found through the hash table. */ if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) { /* Force lookup failure when we have an insanity. */ if (sym->st_shndx == SHN_UNDEF || sym->st_value == 0) { *res = 0; return (EINVAL); } *res = ((Elf_Addr)ef->address + sym->st_value); return (0); } /* * XXX we can avoid doing a hash table based lookup for global * symbols as well. This however is not always valid, so we'll * just do it the hard way for now. Performance tweaks can * always be added. */ symbol = ef->strtab + sym->st_name; /* Force a lookup failure if the symbol name is bogus. */ if (*symbol == 0) { *res = 0; return (EINVAL); } addr = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); if (addr == 0 && ELF_ST_BIND(sym->st_info) != STB_WEAK) { *res = 0; return (EINVAL); } if (elf_set_find(&set_pcpu_list, addr, &start, &base)) addr = addr - start + base; #ifdef VIMAGE else if (elf_set_find(&set_vnet_list, addr, &start, &base)) addr = addr - start + base; #endif *res = addr; return (0); } static void link_elf_reloc_local(linker_file_t lf) { const Elf_Rel *rellim; const Elf_Rel *rel; const Elf_Rela *relalim; const Elf_Rela *rela; elf_file_t ef = (elf_file_t)lf; /* Perform relocations without addend if there are any: */ if ((rel = ef->rel) != NULL) { rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize); while (rel < rellim) { elf_reloc_local(lf, (Elf_Addr)ef->address, rel, ELF_RELOC_REL, elf_lookup); rel++; } } /* Perform relocations with addend if there are any: */ if ((rela = ef->rela) != NULL) { relalim = (const Elf_Rela *) ((const char *)ef->rela + ef->relasize); while (rela < relalim) { elf_reloc_local(lf, (Elf_Addr)ef->address, rela, ELF_RELOC_RELA, elf_lookup); rela++; } } } static long link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) { elf_file_t ef = (elf_file_t)lf; *symtab = ef->ddbsymtab; if (*symtab == NULL) return (0); return (ef->ddbsymcnt); } static long link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) { elf_file_t ef = (elf_file_t)lf; *strtab = ef->ddbstrtab; if (*strtab == NULL) return (0); return (ef->ddbstrcnt); } #if defined(__i386__) || defined(__amd64__) || defined(__aarch64__) || defined(__powerpc__) /* * Use this lookup routine when performing relocations early during boot. * The generic lookup routine depends on kobj, which is not initialized * at that point. */ static int elf_lookup_ifunc(linker_file_t lf, Elf_Size symidx, int deps __unused, Elf_Addr *res) { elf_file_t ef; const Elf_Sym *symp; caddr_t val; ef = (elf_file_t)lf; symp = ef->symtab + symidx; if (ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC) { val = (caddr_t)ef->address + symp->st_value; *res = ((Elf_Addr (*)(void))val)(); return (0); } return (ENOENT); } void link_elf_ireloc(caddr_t kmdp) { struct elf_file eff; elf_file_t ef; ef = &eff; bzero_early(ef, sizeof(*ef)); ef->modptr = kmdp; ef->dynamic = (Elf_Dyn *)&_DYNAMIC; #ifdef RELOCATABLE_KERNEL ef->address = (caddr_t) (__startkernel - KERNBASE); #else ef->address = 0; #endif parse_dynamic(ef); link_elf_preload_parse_symbols(ef); relocate_file1(ef, elf_lookup_ifunc, elf_reloc, true); } + +#if defined(__aarch64__) || defined(__amd64__) +void +link_elf_late_ireloc(void) +{ + elf_file_t ef; + + KASSERT(linker_kernel_file != NULL, + ("link_elf_late_ireloc: No kernel linker file found")); + ef = (elf_file_t)linker_kernel_file; + + relocate_file1(ef, elf_lookup_ifunc, elf_reloc_late, true); +} +#endif #endif Index: head/sys/sys/linker.h =================================================================== --- head/sys/sys/linker.h (revision 362943) +++ head/sys/sys/linker.h (revision 362944) @@ -1,369 +1,375 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 1997-2000 Doug Rabson * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #ifndef _SYS_LINKER_H_ #define _SYS_LINKER_H_ #ifdef _KERNEL #include #include #ifdef MALLOC_DECLARE MALLOC_DECLARE(M_LINKER); #endif struct mod_depend; /* * Object representing a file which has been loaded by the linker. */ typedef struct linker_file* linker_file_t; typedef TAILQ_HEAD(, linker_file) linker_file_list_t; typedef caddr_t linker_sym_t; /* opaque symbol */ typedef c_caddr_t c_linker_sym_t; /* const opaque symbol */ typedef int (*linker_function_name_callback_t)(const char *, void *); /* * expanded out linker_sym_t */ typedef struct linker_symval { const char* name; caddr_t value; size_t size; } linker_symval_t; typedef int (*linker_function_nameval_callback_t)(linker_file_t, int, linker_symval_t *, void *); struct common_symbol { STAILQ_ENTRY(common_symbol) link; char* name; caddr_t address; }; struct linker_file { KOBJ_FIELDS; int refs; /* reference count */ int userrefs; /* kldload(2) count */ int flags; #define LINKER_FILE_LINKED 0x1 /* file has been fully linked */ #define LINKER_FILE_MODULES 0x2 /* file has >0 modules at preload */ TAILQ_ENTRY(linker_file) link; /* list of all loaded files */ char* filename; /* file which was loaded */ char* pathname; /* file name with full path */ int id; /* unique id */ caddr_t address; /* load address */ size_t size; /* size of file */ caddr_t ctors_addr; /* address of .ctors */ size_t ctors_size; /* size of .ctors */ int ndeps; /* number of dependencies */ linker_file_t* deps; /* list of dependencies */ STAILQ_HEAD(, common_symbol) common; /* list of common symbols */ TAILQ_HEAD(, module) modules; /* modules in this file */ TAILQ_ENTRY(linker_file) loaded; /* preload dependency support */ int loadcnt; /* load counter value */ /* * Function Boundary Tracing (FBT) or Statically Defined Tracing (SDT) * fields. */ int nenabled; /* number of enabled probes. */ int fbt_nentries; /* number of fbt entries created. */ #ifdef __arm__ caddr_t exidx_addr; /* Unwind data index table start */ size_t exidx_size; /* Unwind data index table size */ #endif }; /* * Object implementing a class of file (a.out, elf, etc.) */ typedef struct linker_class *linker_class_t; typedef TAILQ_HEAD(, linker_class) linker_class_list_t; struct linker_class { KOBJ_CLASS_FIELDS; TAILQ_ENTRY(linker_class) link; /* list of all file classes */ }; /* * Function type used when iterating over the list of linker files. */ typedef int linker_predicate_t(linker_file_t, void *); /* * The "file" for the kernel. */ extern linker_file_t linker_kernel_file; /* * Obtain a reference to a module, loading it if required. */ int linker_reference_module(const char* _modname, struct mod_depend *_verinfo, linker_file_t* _result); /* * Release a reference to a module, unloading it if there are no more * references. Note that one should either provide a module name and * optional version info or a linker file, but not both. */ int linker_release_module(const char *_modname, struct mod_depend *_verinfo, linker_file_t _file); /* * Iterate over all of the currently loaded linker files calling the * predicate function while the function returns 0. Returns the value * returned by the last predicate function. */ int linker_file_foreach(linker_predicate_t *_predicate, void *_context); /* * Lookup a symbol in a file. If deps is TRUE, look in dependencies * if not found in file. */ caddr_t linker_file_lookup_symbol(linker_file_t _file, const char* _name, int _deps); /* * Lookup a linker set in a file. Return pointers to the first entry, * last + 1, and count of entries. Use: for (p = start; p < stop; p++) {} * void *start is really: "struct yoursetmember ***start;" */ int linker_file_lookup_set(linker_file_t _file, const char *_name, void *_start, void *_stop, int *_count); /* * List all functions in a file. */ int linker_file_function_listall(linker_file_t, linker_function_nameval_callback_t, void *); /* * Functions solely for use by the linker class handlers. */ int linker_add_class(linker_class_t _cls); int linker_file_unload(linker_file_t _file, int flags); int linker_load_dependencies(linker_file_t _lf); linker_file_t linker_make_file(const char* _filename, linker_class_t _cls); /* * DDB Helpers, tuned specifically for ddb/db_kld.c */ int linker_ddb_lookup(const char *_symstr, c_linker_sym_t *_sym); int linker_ddb_search_symbol(caddr_t _value, c_linker_sym_t *_sym, long *_diffp); int linker_ddb_symbol_values(c_linker_sym_t _sym, linker_symval_t *_symval); int linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen, long *offset); /* * stack(9) helper for situations where kernel locking is required. */ int linker_search_symbol_name_flags(caddr_t value, char *buf, u_int buflen, long *offset, int flags); int linker_search_symbol_name(caddr_t value, char *buf, u_int buflen, long *offset); /* HWPMC helper */ void *linker_hwpmc_list_objects(void); #endif /* _KERNEL */ /* * Module information subtypes */ #define MODINFO_END 0x0000 /* End of list */ #define MODINFO_NAME 0x0001 /* Name of module (string) */ #define MODINFO_TYPE 0x0002 /* Type of module (string) */ #define MODINFO_ADDR 0x0003 /* Loaded address */ #define MODINFO_SIZE 0x0004 /* Size of module */ #define MODINFO_EMPTY 0x0005 /* Has been deleted */ #define MODINFO_ARGS 0x0006 /* Parameters string */ #define MODINFO_METADATA 0x8000 /* Module-specfic */ #define MODINFOMD_AOUTEXEC 0x0001 /* a.out exec header */ #define MODINFOMD_ELFHDR 0x0002 /* ELF header */ #define MODINFOMD_SSYM 0x0003 /* start of symbols */ #define MODINFOMD_ESYM 0x0004 /* end of symbols */ #define MODINFOMD_DYNAMIC 0x0005 /* _DYNAMIC pointer */ /* These values are MD on PowerPC */ #if !defined(__powerpc__) #define MODINFOMD_ENVP 0x0006 /* envp[] */ #define MODINFOMD_HOWTO 0x0007 /* boothowto */ #define MODINFOMD_KERNEND 0x0008 /* kernend */ #endif #define MODINFOMD_SHDR 0x0009 /* section header table */ #define MODINFOMD_CTORS_ADDR 0x000a /* address of .ctors */ #define MODINFOMD_CTORS_SIZE 0x000b /* size of .ctors */ #define MODINFOMD_FW_HANDLE 0x000c /* Firmware dependent handle */ #define MODINFOMD_KEYBUF 0x000d /* Crypto key intake buffer */ #define MODINFOMD_NOCOPY 0x8000 /* don't copy this metadata to the kernel */ #define MODINFOMD_DEPLIST (0x4001 | MODINFOMD_NOCOPY) /* depends on */ #ifdef _KERNEL #define MD_FETCH(mdp, info, type) ({ \ type *__p; \ __p = (type *)preload_search_info((mdp), MODINFO_METADATA | (info)); \ __p ? *__p : 0; \ }) #endif #define LINKER_HINTS_VERSION 1 /* linker.hints file version */ #define LINKER_HINTS_MAX (1 << 20) /* Allow at most 1MB for linker.hints */ #ifdef _KERNEL /* * Module lookup */ extern vm_offset_t preload_addr_relocate; extern caddr_t preload_metadata; extern void * preload_fetch_addr(caddr_t _mod); extern size_t preload_fetch_size(caddr_t _mod); extern caddr_t preload_search_by_name(const char *_name); extern caddr_t preload_search_by_type(const char *_type); extern caddr_t preload_search_next_name(caddr_t _base); extern caddr_t preload_search_info(caddr_t _mod, int _inf); extern void preload_delete_name(const char *_name); extern void preload_bootstrap_relocate(vm_offset_t _offset); #ifdef KLD_DEBUG extern int kld_debug; #define KLD_DEBUG_FILE 1 /* file load/unload */ #define KLD_DEBUG_SYM 2 /* symbol lookup */ #define KLD_DPF(cat, args) \ do { \ if (kld_debug & KLD_DEBUG_##cat) printf args; \ } while (0) #else #define KLD_DPF(cat, args) #endif typedef int elf_lookup_fn(linker_file_t, Elf_Size, int, Elf_Addr *); /* Support functions */ bool elf_is_ifunc_reloc(Elf_Size r_info); int elf_reloc(linker_file_t _lf, Elf_Addr base, const void *_rel, int _type, elf_lookup_fn _lu); int elf_reloc_local(linker_file_t _lf, Elf_Addr base, const void *_rel, int _type, elf_lookup_fn _lu); Elf_Addr elf_relocaddr(linker_file_t _lf, Elf_Addr addr); const Elf_Sym *elf_get_sym(linker_file_t _lf, Elf_Size _symidx); const char *elf_get_symname(linker_file_t _lf, Elf_Size _symidx); void link_elf_ireloc(caddr_t kmdp); +#if defined(__aarch64__) || defined(__amd64__) +int elf_reloc_late(linker_file_t _lf, Elf_Addr base, const void *_rel, + int _type, elf_lookup_fn _lu); +void link_elf_late_ireloc(void); +#endif + typedef struct linker_ctf { const uint8_t *ctftab; /* Decompressed CTF data. */ int ctfcnt; /* Number of CTF data bytes. */ const Elf_Sym *symtab; /* Ptr to the symbol table. */ int nsym; /* Number of symbols. */ const char *strtab; /* Ptr to the string table. */ int strcnt; /* Number of string bytes. */ uint32_t **ctfoffp; /* Ptr to array of obj/fnc offsets. */ uint32_t **typoffp; /* Ptr to array of type offsets. */ long *typlenp; /* Ptr to number of type data entries. */ } linker_ctf_t; int linker_ctf_get(linker_file_t, linker_ctf_t *); int elf_cpu_load_file(linker_file_t); int elf_cpu_unload_file(linker_file_t); int elf_cpu_parse_dynamic(caddr_t, Elf_Dyn *); /* values for type */ #define ELF_RELOC_REL 1 #define ELF_RELOC_RELA 2 /* * This is version 1 of the KLD file status structure. It is identified * by its _size_ in the version field. */ struct kld_file_stat_1 { int version; /* set to sizeof(struct kld_file_stat_1) */ char name[MAXPATHLEN]; int refs; int id; caddr_t address; /* load address */ size_t size; /* size in bytes */ }; #endif /* _KERNEL */ struct kld_file_stat { int version; /* set to sizeof(struct kld_file_stat) */ char name[MAXPATHLEN]; int refs; int id; caddr_t address; /* load address */ size_t size; /* size in bytes */ char pathname[MAXPATHLEN]; }; struct kld_sym_lookup { int version; /* set to sizeof(struct kld_sym_lookup) */ char *symname; /* Symbol name we are looking up */ u_long symvalue; size_t symsize; }; #define KLDSYM_LOOKUP 1 /* * Flags for kldunloadf() and linker_file_unload() */ #define LINKER_UNLOAD_NORMAL 0 #define LINKER_UNLOAD_FORCE 1 #ifndef _KERNEL #include __BEGIN_DECLS int kldload(const char* _file); int kldunload(int _fileid); int kldunloadf(int _fileid, int flags); int kldfind(const char* _file); int kldnext(int _fileid); int kldstat(int _fileid, struct kld_file_stat* _stat); int kldfirstmod(int _fileid); int kldsym(int _fileid, int _cmd, void *_data); __END_DECLS #endif #endif /* !_SYS_LINKER_H_ */