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diff --git a/sys/conf/files.i386 b/sys/conf/files.i386
--- a/sys/conf/files.i386
+++ b/sys/conf/files.i386
@@ -104,6 +104,7 @@
i386/i386/db_disasm.c optional ddb
i386/i386/db_interface.c optional ddb
i386/i386/db_trace.c optional ddb
+i386/i386/exec_machdep.c standard
i386/i386/elan-mmcr.c optional cpu_elan | cpu_soekris
i386/i386/elf_machdep.c standard
i386/i386/exception.s standard
diff --git a/sys/i386/i386/exec_machdep.c b/sys/i386/i386/exec_machdep.c
new file mode 100644
--- /dev/null
+++ b/sys/i386/i386/exec_machdep.c
@@ -0,0 +1,1443 @@
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
+ * Copyright (c) 2018 The FreeBSD Foundation
+ * 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.
+ *
+ * Portions of this software were developed by A. Joseph Koshy under
+ * sponsorship from the FreeBSD Foundation and Google, Inc.
+ *
+ * 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_cpu.h"
+#include "opt_ddb.h"
+#include "opt_kstack_pages.h"
+
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/systm.h>
+#include <sys/exec.h>
+#include <sys/imgact.h>
+#include <sys/kdb.h>
+#include <sys/kernel.h>
+#include <sys/ktr.h>
+#include <sys/linker.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/pcpu.h>
+#include <sys/ptrace.h>
+#include <sys/reg.h>
+#include <sys/rwlock.h>
+#include <sys/signalvar.h>
+#include <sys/syscallsubr.h>
+#include <sys/sysctl.h>
+#include <sys/sysent.h>
+#include <sys/sysproto.h>
+#include <sys/ucontext.h>
+#include <sys/vmmeter.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/vm_extern.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_page.h>
+#include <vm/vm_map.h>
+#include <vm/vm_object.h>
+
+#ifdef DDB
+#ifndef KDB
+#error KDB must be enabled in order for DDB to work!
+#endif
+#include <ddb/ddb.h>
+#include <ddb/db_sym.h>
+#endif
+
+#include <machine/cpu.h>
+#include <machine/cputypes.h>
+#include <machine/md_var.h>
+#include <machine/pcb.h>
+#include <machine/pcb_ext.h>
+#include <machine/proc.h>
+#include <machine/sigframe.h>
+#include <machine/specialreg.h>
+#include <machine/sysarch.h>
+#include <machine/trap.h>
+
+static void fpstate_drop(struct thread *td);
+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);
+#ifdef COMPAT_43
+static void osendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
+#endif
+#ifdef COMPAT_FREEBSD4
+static void freebsd4_sendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
+#endif
+
+extern struct sysentvec elf32_freebsd_sysvec;
+
+/*
+ * 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.
+ */
+#ifdef COMPAT_43
+static void
+osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
+{
+ struct osigframe sf, *fp;
+ struct proc *p;
+ struct thread *td;
+ struct sigacts *psp;
+ struct trapframe *regs;
+ int sig;
+ int oonstack;
+
+ 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);
+ regs = td->td_frame;
+ oonstack = sigonstack(regs->tf_esp);
+
+ /* Allocate space for the signal handler context. */
+ if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
+ SIGISMEMBER(psp->ps_sigonstack, sig)) {
+ fp = (struct osigframe *)((uintptr_t)td->td_sigstk.ss_sp +
+ td->td_sigstk.ss_size - sizeof(struct osigframe));
+#if defined(COMPAT_43)
+ td->td_sigstk.ss_flags |= SS_ONSTACK;
+#endif
+ } else
+ fp = (struct osigframe *)regs->tf_esp - 1;
+
+ /* Build the argument list for the signal handler. */
+ sf.sf_signum = sig;
+ sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
+ bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo));
+ if (SIGISMEMBER(psp->ps_siginfo, sig)) {
+ /* Signal handler installed with SA_SIGINFO. */
+ sf.sf_arg2 = (register_t)&fp->sf_siginfo;
+ sf.sf_siginfo.si_signo = sig;
+ sf.sf_siginfo.si_code = ksi->ksi_code;
+ sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher;
+ sf.sf_addr = 0;
+ } else {
+ /* Old FreeBSD-style arguments. */
+ sf.sf_arg2 = ksi->ksi_code;
+ sf.sf_addr = (register_t)ksi->ksi_addr;
+ sf.sf_ahu.sf_handler = catcher;
+ }
+ mtx_unlock(&psp->ps_mtx);
+ PROC_UNLOCK(p);
+
+ /* Save most if not all of trap frame. */
+ sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax;
+ sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx;
+ sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx;
+ sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx;
+ sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi;
+ sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi;
+ sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
+ sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
+ sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
+ sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
+ sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
+ sf.sf_siginfo.si_sc.sc_gs = rgs();
+ sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp;
+
+ /* Build the signal context to be used by osigreturn(). */
+ sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
+ SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
+ sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp;
+ sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp;
+ sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip;
+ sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags;
+ sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
+ sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
+
+ /*
+ * If we're a vm86 process, we want to save the segment registers.
+ * We also change eflags to be our emulated eflags, not the actual
+ * eflags.
+ */
+ if (regs->tf_eflags & PSL_VM) {
+ /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */
+ struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
+ struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
+
+ sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs;
+ sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs;
+ sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es;
+ sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds;
+
+ if (vm86->vm86_has_vme == 0)
+ sf.sf_siginfo.si_sc.sc_ps =
+ (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
+ (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
+
+ /* See sendsig() for comments. */
+ tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
+ }
+
+ /*
+ * Copy the sigframe out to the user's stack.
+ */
+ if (copyout(&sf, fp, sizeof(*fp)) != 0) {
+ PROC_LOCK(p);
+ sigexit(td, SIGILL);
+ }
+
+ regs->tf_esp = (int)fp;
+ if (p->p_sysent->sv_sigcode_base != 0) {
+ regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
+ szosigcode;
+ } else {
+ /* a.out sysentvec does not use shared page */
+ regs->tf_eip = p->p_sysent->sv_psstrings - szosigcode;
+ }
+ regs->tf_eflags &= ~(PSL_T | PSL_D);
+ regs->tf_cs = _ucodesel;
+ regs->tf_ds = _udatasel;
+ regs->tf_es = _udatasel;
+ regs->tf_fs = _udatasel;
+ load_gs(_udatasel);
+ regs->tf_ss = _udatasel;
+ PROC_LOCK(p);
+ mtx_lock(&psp->ps_mtx);
+}
+#endif /* COMPAT_43 */
+
+#ifdef COMPAT_FREEBSD4
+static void
+freebsd4_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
+{
+ struct sigframe4 sf, *sfp;
+ struct proc *p;
+ struct thread *td;
+ struct sigacts *psp;
+ struct trapframe *regs;
+ int sig;
+ int oonstack;
+
+ 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);
+ regs = td->td_frame;
+ oonstack = sigonstack(regs->tf_esp);
+
+ /* 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;
+ sf.sf_uc.uc_mcontext.mc_gs = rgs();
+ bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
+ bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
+ sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
+ bzero(sf.sf_uc.uc_mcontext.__spare__,
+ sizeof(sf.sf_uc.uc_mcontext.__spare__));
+ bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
+
+ /* Allocate space for the signal handler context. */
+ if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
+ SIGISMEMBER(psp->ps_sigonstack, sig)) {
+ sfp = (struct sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
+ td->td_sigstk.ss_size - sizeof(struct sigframe4));
+#if defined(COMPAT_43)
+ td->td_sigstk.ss_flags |= SS_ONSTACK;
+#endif
+ } else
+ sfp = (struct sigframe4 *)regs->tf_esp - 1;
+
+ /* Build the argument list for the signal handler. */
+ sf.sf_signum = sig;
+ sf.sf_ucontext = (register_t)&sfp->sf_uc;
+ bzero(&sf.sf_si, sizeof(sf.sf_si));
+ if (SIGISMEMBER(psp->ps_siginfo, sig)) {
+ /* Signal handler installed with SA_SIGINFO. */
+ sf.sf_siginfo = (register_t)&sfp->sf_si;
+ sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
+
+ /* Fill in POSIX parts */
+ sf.sf_si.si_signo = sig;
+ sf.sf_si.si_code = ksi->ksi_code;
+ sf.sf_si.si_addr = ksi->ksi_addr;
+ } else {
+ /* Old FreeBSD-style arguments. */
+ sf.sf_siginfo = ksi->ksi_code;
+ sf.sf_addr = (register_t)ksi->ksi_addr;
+ sf.sf_ahu.sf_handler = catcher;
+ }
+ mtx_unlock(&psp->ps_mtx);
+ PROC_UNLOCK(p);
+
+ /*
+ * If we're a vm86 process, we want to save the segment registers.
+ * We also change eflags to be our emulated eflags, not the actual
+ * eflags.
+ */
+ if (regs->tf_eflags & PSL_VM) {
+ struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
+ struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
+
+ sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
+ sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
+ sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
+ sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
+
+ if (vm86->vm86_has_vme == 0)
+ sf.sf_uc.uc_mcontext.mc_eflags =
+ (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
+ (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
+
+ /*
+ * Clear PSL_NT to inhibit T_TSSFLT faults on return from
+ * syscalls made by the signal handler. This just avoids
+ * wasting time for our lazy fixup of such faults. PSL_NT
+ * does nothing in vm86 mode, but vm86 programs can set it
+ * almost legitimately in probes for old cpu types.
+ */
+ tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
+ }
+
+ /*
+ * Copy the sigframe out to the user's stack.
+ */
+ if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
+ PROC_LOCK(p);
+ sigexit(td, SIGILL);
+ }
+
+ regs->tf_esp = (int)sfp;
+ regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
+ szfreebsd4_sigcode;
+ regs->tf_eflags &= ~(PSL_T | PSL_D);
+ regs->tf_cs = _ucodesel;
+ regs->tf_ds = _udatasel;
+ regs->tf_es = _udatasel;
+ regs->tf_fs = _udatasel;
+ regs->tf_ss = _udatasel;
+ PROC_LOCK(p);
+ mtx_lock(&psp->ps_mtx);
+}
+#endif /* COMPAT_FREEBSD4 */
+
+void
+sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
+{
+ struct sigframe sf, *sfp;
+ struct proc *p;
+ struct thread *td;
+ struct sigacts *psp;
+ char *sp;
+ struct trapframe *regs;
+ struct segment_descriptor *sdp;
+ char *xfpusave;
+ size_t xfpusave_len;
+ int sig;
+ int oonstack;
+
+ 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);
+#ifdef COMPAT_FREEBSD4
+ if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
+ freebsd4_sendsig(catcher, ksi, mask);
+ return;
+ }
+#endif
+#ifdef COMPAT_43
+ if (SIGISMEMBER(psp->ps_osigset, sig)) {
+ osendsig(catcher, ksi, mask);
+ return;
+ }
+#endif
+ regs = td->td_frame;
+ oonstack = sigonstack(regs->tf_esp);
+
+ if (cpu_max_ext_state_size > sizeof(union savefpu) && use_xsave) {
+ xfpusave_len = cpu_max_ext_state_size - sizeof(union 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;
+ sf.sf_uc.uc_mcontext.mc_gs = rgs();
+ bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, 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);
+ /*
+ * Unconditionally fill the fsbase and gsbase into the mcontext.
+ */
+ sdp = &td->td_pcb->pcb_fsd;
+ sf.sf_uc.uc_mcontext.mc_fsbase = sdp->sd_hibase << 24 |
+ sdp->sd_lobase;
+ sdp = &td->td_pcb->pcb_gsd;
+ sf.sf_uc.uc_mcontext.mc_gsbase = sdp->sd_hibase << 24 |
+ sdp->sd_lobase;
+ bzero(sf.sf_uc.uc_mcontext.mc_spare2,
+ sizeof(sf.sf_uc.uc_mcontext.mc_spare2));
+
+ /* 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_esp - 128;
+ if (xfpusave != NULL) {
+ sp -= xfpusave_len;
+ sp = (char *)((unsigned int)sp & ~0x3F);
+ sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
+ }
+ sp -= sizeof(struct sigframe);
+
+ /* Align to 16 bytes. */
+ sfp = (struct sigframe *)((unsigned int)sp & ~0xF);
+
+ /* Build the argument list for the signal handler. */
+ sf.sf_signum = sig;
+ sf.sf_ucontext = (register_t)&sfp->sf_uc;
+ bzero(&sf.sf_si, sizeof(sf.sf_si));
+ if (SIGISMEMBER(psp->ps_siginfo, sig)) {
+ /* Signal handler installed with SA_SIGINFO. */
+ sf.sf_siginfo = (register_t)&sfp->sf_si;
+ 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 */
+ } else {
+ /* Old FreeBSD-style arguments. */
+ sf.sf_siginfo = ksi->ksi_code;
+ sf.sf_addr = (register_t)ksi->ksi_addr;
+ sf.sf_ahu.sf_handler = catcher;
+ }
+ mtx_unlock(&psp->ps_mtx);
+ PROC_UNLOCK(p);
+
+ /*
+ * If we're a vm86 process, we want to save the segment registers.
+ * We also change eflags to be our emulated eflags, not the actual
+ * eflags.
+ */
+ if (regs->tf_eflags & PSL_VM) {
+ struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
+ struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
+
+ sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
+ sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
+ sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
+ sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
+
+ if (vm86->vm86_has_vme == 0)
+ sf.sf_uc.uc_mcontext.mc_eflags =
+ (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
+ (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
+
+ /*
+ * Clear PSL_NT to inhibit T_TSSFLT faults on return from
+ * syscalls made by the signal handler. This just avoids
+ * wasting time for our lazy fixup of such faults. PSL_NT
+ * does nothing in vm86 mode, but vm86 programs can set it
+ * almost legitimately in probes for old cpu types.
+ */
+ tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
+ }
+
+ /*
+ * 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)) {
+ PROC_LOCK(p);
+ sigexit(td, SIGILL);
+ }
+
+ regs->tf_esp = (int)sfp;
+ regs->tf_eip = p->p_sysent->sv_sigcode_base;
+ if (regs->tf_eip == 0)
+ regs->tf_eip = p->p_sysent->sv_psstrings - szsigcode;
+ regs->tf_eflags &= ~(PSL_T | PSL_D);
+ regs->tf_cs = _ucodesel;
+ regs->tf_ds = _udatasel;
+ regs->tf_es = _udatasel;
+ regs->tf_fs = _udatasel;
+ regs->tf_ss = _udatasel;
+ 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.
+ */
+#ifdef COMPAT_43
+int
+osigreturn(struct thread *td, struct osigreturn_args *uap)
+{
+ struct osigcontext sc;
+ struct trapframe *regs;
+ struct osigcontext *scp;
+ int eflags, error;
+ ksiginfo_t ksi;
+
+ regs = td->td_frame;
+ error = copyin(uap->sigcntxp, &sc, sizeof(sc));
+ if (error != 0)
+ return (error);
+ scp = &sc;
+ eflags = scp->sc_ps;
+ if (eflags & PSL_VM) {
+ struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
+ struct vm86_kernel *vm86;
+
+ /*
+ * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
+ * set up the vm86 area, and we can't enter vm86 mode.
+ */
+ if (td->td_pcb->pcb_ext == 0)
+ return (EINVAL);
+ vm86 = &td->td_pcb->pcb_ext->ext_vm86;
+ if (vm86->vm86_inited == 0)
+ return (EINVAL);
+
+ /* Go back to user mode if both flags are set. */
+ if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
+ ksiginfo_init_trap(&ksi);
+ ksi.ksi_signo = SIGBUS;
+ ksi.ksi_code = BUS_OBJERR;
+ ksi.ksi_addr = (void *)regs->tf_eip;
+ trapsignal(td, &ksi);
+ }
+
+ if (vm86->vm86_has_vme) {
+ eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
+ (eflags & VME_USERCHANGE) | PSL_VM;
+ } else {
+ vm86->vm86_eflags = eflags; /* save VIF, VIP */
+ eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
+ (eflags & VM_USERCHANGE) | PSL_VM;
+ }
+ tf->tf_vm86_ds = scp->sc_ds;
+ tf->tf_vm86_es = scp->sc_es;
+ tf->tf_vm86_fs = scp->sc_fs;
+ tf->tf_vm86_gs = scp->sc_gs;
+ tf->tf_ds = _udatasel;
+ tf->tf_es = _udatasel;
+ tf->tf_fs = _udatasel;
+ } else {
+ /*
+ * Don't allow users to change privileged or reserved flags.
+ */
+ if (!EFL_SECURE(eflags, regs->tf_eflags)) {
+ 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.
+ */
+ if (!CS_SECURE(scp->sc_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_eip;
+ trapsignal(td, &ksi);
+ return (EINVAL);
+ }
+ regs->tf_ds = scp->sc_ds;
+ regs->tf_es = scp->sc_es;
+ regs->tf_fs = scp->sc_fs;
+ }
+
+ /* Restore remaining registers. */
+ regs->tf_eax = scp->sc_eax;
+ regs->tf_ebx = scp->sc_ebx;
+ regs->tf_ecx = scp->sc_ecx;
+ regs->tf_edx = scp->sc_edx;
+ regs->tf_esi = scp->sc_esi;
+ regs->tf_edi = scp->sc_edi;
+ regs->tf_cs = scp->sc_cs;
+ regs->tf_ss = scp->sc_ss;
+ regs->tf_isp = scp->sc_isp;
+ regs->tf_ebp = scp->sc_fp;
+ regs->tf_esp = scp->sc_sp;
+ regs->tf_eip = scp->sc_pc;
+ regs->tf_eflags = eflags;
+
+#if defined(COMPAT_43)
+ if (scp->sc_onstack & 1)
+ td->td_sigstk.ss_flags |= SS_ONSTACK;
+ else
+ td->td_sigstk.ss_flags &= ~SS_ONSTACK;
+#endif
+ kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
+ SIGPROCMASK_OLD);
+ return (EJUSTRETURN);
+}
+#endif /* COMPAT_43 */
+
+#ifdef COMPAT_FREEBSD4
+int
+freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
+{
+ struct ucontext4 uc;
+ struct trapframe *regs;
+ struct ucontext4 *ucp;
+ int cs, eflags, error;
+ ksiginfo_t ksi;
+
+ error = copyin(uap->sigcntxp, &uc, sizeof(uc));
+ if (error != 0)
+ return (error);
+ ucp = &uc;
+ regs = td->td_frame;
+ eflags = ucp->uc_mcontext.mc_eflags;
+ if (eflags & PSL_VM) {
+ struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
+ struct vm86_kernel *vm86;
+
+ /*
+ * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
+ * set up the vm86 area, and we can't enter vm86 mode.
+ */
+ if (td->td_pcb->pcb_ext == 0)
+ return (EINVAL);
+ vm86 = &td->td_pcb->pcb_ext->ext_vm86;
+ if (vm86->vm86_inited == 0)
+ return (EINVAL);
+
+ /* Go back to user mode if both flags are set. */
+ if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
+ ksiginfo_init_trap(&ksi);
+ ksi.ksi_signo = SIGBUS;
+ ksi.ksi_code = BUS_OBJERR;
+ ksi.ksi_addr = (void *)regs->tf_eip;
+ trapsignal(td, &ksi);
+ }
+ if (vm86->vm86_has_vme) {
+ eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
+ (eflags & VME_USERCHANGE) | PSL_VM;
+ } else {
+ vm86->vm86_eflags = eflags; /* save VIF, VIP */
+ eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
+ (eflags & VM_USERCHANGE) | PSL_VM;
+ }
+ bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
+ tf->tf_eflags = eflags;
+ tf->tf_vm86_ds = tf->tf_ds;
+ tf->tf_vm86_es = tf->tf_es;
+ tf->tf_vm86_fs = tf->tf_fs;
+ tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
+ tf->tf_ds = _udatasel;
+ tf->tf_es = _udatasel;
+ tf->tf_fs = _udatasel;
+ } else {
+ /*
+ * Don't allow users to change privileged or reserved flags.
+ */
+ if (!EFL_SECURE(eflags, regs->tf_eflags)) {
+ uprintf(
+ "pid %d (%s): freebsd4_sigreturn eflags = 0x%x\n",
+ td->td_proc->p_pid, td->td_name, eflags);
+ 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): freebsd4_sigreturn cs = 0x%x\n",
+ td->td_proc->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_eip;
+ trapsignal(td, &ksi);
+ return (EINVAL);
+ }
+
+ bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
+ }
+
+#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);
+}
+#endif /* COMPAT_FREEBSD4 */
+
+int
+sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
+{
+ ucontext_t uc;
+ struct proc *p;
+ struct trapframe *regs;
+ ucontext_t *ucp;
+ char *xfpustate;
+ size_t xfpustate_len;
+ int cs, eflags, error, ret;
+ ksiginfo_t ksi;
+
+ p = td->td_proc;
+
+ error = copyin(uap->sigcntxp, &uc, sizeof(uc));
+ if (error != 0)
+ 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;
+ eflags = ucp->uc_mcontext.mc_eflags;
+ if (eflags & PSL_VM) {
+ struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
+ struct vm86_kernel *vm86;
+
+ /*
+ * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
+ * set up the vm86 area, and we can't enter vm86 mode.
+ */
+ if (td->td_pcb->pcb_ext == 0)
+ return (EINVAL);
+ vm86 = &td->td_pcb->pcb_ext->ext_vm86;
+ if (vm86->vm86_inited == 0)
+ return (EINVAL);
+
+ /* Go back to user mode if both flags are set. */
+ if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
+ ksiginfo_init_trap(&ksi);
+ ksi.ksi_signo = SIGBUS;
+ ksi.ksi_code = BUS_OBJERR;
+ ksi.ksi_addr = (void *)regs->tf_eip;
+ trapsignal(td, &ksi);
+ }
+
+ if (vm86->vm86_has_vme) {
+ eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
+ (eflags & VME_USERCHANGE) | PSL_VM;
+ } else {
+ vm86->vm86_eflags = eflags; /* save VIF, VIP */
+ eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
+ (eflags & VM_USERCHANGE) | PSL_VM;
+ }
+ bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
+ tf->tf_eflags = eflags;
+ tf->tf_vm86_ds = tf->tf_ds;
+ tf->tf_vm86_es = tf->tf_es;
+ tf->tf_vm86_fs = tf->tf_fs;
+ tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
+ tf->tf_ds = _udatasel;
+ tf->tf_es = _udatasel;
+ tf->tf_fs = _udatasel;
+ } else {
+ /*
+ * Don't allow users to change privileged or reserved flags.
+ */
+ if (!EFL_SECURE(eflags, regs->tf_eflags)) {
+ uprintf("pid %d (%s): sigreturn eflags = 0x%x\n",
+ td->td_proc->p_pid, td->td_name, eflags);
+ 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",
+ td->td_proc->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_eip;
+ 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(union 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)
+ return (ret);
+ bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
+ }
+
+#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);
+}
+
+/*
+ * Reset the hardware debug registers if they were in use.
+ * They won't have any meaning for the newly exec'd process.
+ */
+void
+x86_clear_dbregs(struct pcb *pcb)
+{
+ if ((pcb->pcb_flags & PCB_DBREGS) == 0)
+ return;
+
+ 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();
+ }
+ pcb->pcb_flags &= ~PCB_DBREGS;
+}
+
+#ifdef COMPAT_43
+static void
+setup_priv_lcall_gate(struct proc *p)
+{
+ struct i386_ldt_args uap;
+ union descriptor desc;
+ u_int lcall_addr;
+
+ bzero(&uap, sizeof(uap));
+ uap.start = 0;
+ uap.num = 1;
+ lcall_addr = p->p_sysent->sv_psstrings - sz_lcall_tramp;
+ bzero(&desc, sizeof(desc));
+ desc.sd.sd_type = SDT_MEMERA;
+ desc.sd.sd_dpl = SEL_UPL;
+ desc.sd.sd_p = 1;
+ desc.sd.sd_def32 = 1;
+ desc.sd.sd_gran = 1;
+ desc.sd.sd_lolimit = 0xffff;
+ desc.sd.sd_hilimit = 0xf;
+ desc.sd.sd_lobase = lcall_addr;
+ desc.sd.sd_hibase = lcall_addr >> 24;
+ i386_set_ldt(curthread, &uap, &desc);
+}
+#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_eflags;
+
+ regs = td->td_frame;
+ pcb = td->td_pcb;
+
+ /* Reset pc->pcb_gs and %gs before possibly invalidating it. */
+ pcb->pcb_gs = _udatasel;
+ load_gs(_udatasel);
+
+ mtx_lock_spin(&dt_lock);
+ if (td->td_proc->p_md.md_ldt != NULL)
+ user_ldt_free(td);
+ else
+ mtx_unlock_spin(&dt_lock);
+
+#ifdef COMPAT_43
+ if (td->td_proc->p_sysent->sv_psstrings !=
+ elf32_freebsd_sysvec.sv_psstrings)
+ setup_priv_lcall_gate(td->td_proc);
+#endif
+
+ /*
+ * Reset the fs and gs bases. The values from the old address
+ * space do not make sense for the new program. In particular,
+ * gsbase might be the TLS base for the old program but the new
+ * program has no TLS now.
+ */
+ set_fsbase(td, 0);
+ set_gsbase(td, 0);
+
+ /* Make sure edx is 0x0 on entry. Linux binaries depend on it. */
+ saved_eflags = regs->tf_eflags & PSL_T;
+ bzero((char *)regs, sizeof(struct trapframe));
+ regs->tf_eip = imgp->entry_addr;
+ regs->tf_esp = stack;
+ regs->tf_eflags = PSL_USER | saved_eflags;
+ regs->tf_ss = _udatasel;
+ regs->tf_ds = _udatasel;
+ regs->tf_es = _udatasel;
+ regs->tf_fs = _udatasel;
+ regs->tf_cs = _ucodesel;
+
+ /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
+ regs->tf_ebx = (register_t)imgp->ps_strings;
+
+ x86_clear_dbregs(pcb);
+
+ pcb->pcb_initial_npxcw = __INITIAL_NPXCW__;
+
+ /*
+ * 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);
+}
+
+int
+fill_regs(struct thread *td, struct reg *regs)
+{
+ struct pcb *pcb;
+ struct trapframe *tp;
+
+ tp = td->td_frame;
+ pcb = td->td_pcb;
+ regs->r_gs = pcb->pcb_gs;
+ return (fill_frame_regs(tp, regs));
+}
+
+int
+fill_frame_regs(struct trapframe *tp, struct reg *regs)
+{
+
+ regs->r_fs = tp->tf_fs;
+ regs->r_es = tp->tf_es;
+ regs->r_ds = tp->tf_ds;
+ regs->r_edi = tp->tf_edi;
+ regs->r_esi = tp->tf_esi;
+ regs->r_ebp = tp->tf_ebp;
+ regs->r_ebx = tp->tf_ebx;
+ regs->r_edx = tp->tf_edx;
+ regs->r_ecx = tp->tf_ecx;
+ regs->r_eax = tp->tf_eax;
+ regs->r_eip = tp->tf_eip;
+ regs->r_cs = tp->tf_cs;
+ regs->r_eflags = tp->tf_eflags;
+ regs->r_esp = tp->tf_esp;
+ regs->r_ss = tp->tf_ss;
+ regs->r_err = 0;
+ regs->r_trapno = 0;
+ return (0);
+}
+
+int
+set_regs(struct thread *td, struct reg *regs)
+{
+ struct pcb *pcb;
+ struct trapframe *tp;
+
+ tp = td->td_frame;
+ if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
+ !CS_SECURE(regs->r_cs))
+ return (EINVAL);
+ pcb = td->td_pcb;
+ tp->tf_fs = regs->r_fs;
+ tp->tf_es = regs->r_es;
+ tp->tf_ds = regs->r_ds;
+ tp->tf_edi = regs->r_edi;
+ tp->tf_esi = regs->r_esi;
+ tp->tf_ebp = regs->r_ebp;
+ tp->tf_ebx = regs->r_ebx;
+ tp->tf_edx = regs->r_edx;
+ tp->tf_ecx = regs->r_ecx;
+ tp->tf_eax = regs->r_eax;
+ tp->tf_eip = regs->r_eip;
+ tp->tf_cs = regs->r_cs;
+ tp->tf_eflags = regs->r_eflags;
+ tp->tf_esp = regs->r_esp;
+ tp->tf_ss = regs->r_ss;
+ pcb->pcb_gs = regs->r_gs;
+ return (0);
+}
+
+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));
+ npxgetregs(td);
+ if (cpu_fxsr)
+ npx_fill_fpregs_xmm(&get_pcb_user_save_td(td)->sv_xmm,
+ (struct save87 *)fpregs);
+ else
+ bcopy(&get_pcb_user_save_td(td)->sv_87, fpregs,
+ sizeof(*fpregs));
+ return (0);
+}
+
+int
+set_fpregs(struct thread *td, struct fpreg *fpregs)
+{
+
+ critical_enter();
+ if (cpu_fxsr)
+ npx_set_fpregs_xmm((struct save87 *)fpregs,
+ &get_pcb_user_save_td(td)->sv_xmm);
+ else
+ bcopy(fpregs, &get_pcb_user_save_td(td)->sv_87,
+ sizeof(*fpregs));
+ npxuserinited(td);
+ critical_exit();
+ return (0);
+}
+
+/*
+ * Get machine context.
+ */
+int
+get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
+{
+ struct trapframe *tp;
+ struct segment_descriptor *sdp;
+
+ tp = td->td_frame;
+
+ PROC_LOCK(curthread->td_proc);
+ mcp->mc_onstack = sigonstack(tp->tf_esp);
+ PROC_UNLOCK(curthread->td_proc);
+ mcp->mc_gs = td->td_pcb->pcb_gs;
+ mcp->mc_fs = tp->tf_fs;
+ mcp->mc_es = tp->tf_es;
+ mcp->mc_ds = tp->tf_ds;
+ mcp->mc_edi = tp->tf_edi;
+ mcp->mc_esi = tp->tf_esi;
+ mcp->mc_ebp = tp->tf_ebp;
+ mcp->mc_isp = tp->tf_isp;
+ mcp->mc_eflags = tp->tf_eflags;
+ if (flags & GET_MC_CLEAR_RET) {
+ mcp->mc_eax = 0;
+ mcp->mc_edx = 0;
+ mcp->mc_eflags &= ~PSL_C;
+ } else {
+ mcp->mc_eax = tp->tf_eax;
+ mcp->mc_edx = tp->tf_edx;
+ }
+ mcp->mc_ebx = tp->tf_ebx;
+ mcp->mc_ecx = tp->tf_ecx;
+ mcp->mc_eip = tp->tf_eip;
+ mcp->mc_cs = tp->tf_cs;
+ mcp->mc_esp = tp->tf_esp;
+ mcp->mc_ss = tp->tf_ss;
+ mcp->mc_len = sizeof(*mcp);
+ get_fpcontext(td, mcp, NULL, 0);
+ sdp = &td->td_pcb->pcb_fsd;
+ mcp->mc_fsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
+ sdp = &td->td_pcb->pcb_gsd;
+ mcp->mc_gsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
+ mcp->mc_flags = 0;
+ mcp->mc_xfpustate = 0;
+ mcp->mc_xfpustate_len = 0;
+ bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
+ 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 trapframe *tp;
+ char *xfpustate;
+ int eflags, ret;
+
+ tp = td->td_frame;
+ if (mcp->mc_len != sizeof(*mcp) ||
+ (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
+ return (EINVAL);
+ eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
+ (tp->tf_eflags & ~PSL_USERCHANGE);
+ if (mcp->mc_flags & _MC_HASFPXSTATE) {
+ if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
+ sizeof(union 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_fs = mcp->mc_fs;
+ tp->tf_es = mcp->mc_es;
+ tp->tf_ds = mcp->mc_ds;
+ tp->tf_edi = mcp->mc_edi;
+ tp->tf_esi = mcp->mc_esi;
+ tp->tf_ebp = mcp->mc_ebp;
+ tp->tf_ebx = mcp->mc_ebx;
+ tp->tf_edx = mcp->mc_edx;
+ tp->tf_ecx = mcp->mc_ecx;
+ tp->tf_eax = mcp->mc_eax;
+ tp->tf_eip = mcp->mc_eip;
+ tp->tf_eflags = eflags;
+ tp->tf_esp = mcp->mc_esp;
+ tp->tf_ss = mcp->mc_ss;
+ td->td_pcb->pcb_gs = mcp->mc_gs;
+ 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 = npxgetregs(td);
+ bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
+ sizeof(mcp->mc_fpstate));
+ mcp->mc_fpformat = npxformat();
+ if (!use_xsave || xfpusave_len == 0)
+ return;
+ max_len = cpu_max_ext_state_size - sizeof(union 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_387 &&
+ 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 = npxsetregs(td, (union savefpu *)&mcp->mc_fpstate,
+ xfpustate, xfpustate_len);
+ } else
+ return (EINVAL);
+ return (error);
+}
+
+static 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)
+ npxdrop();
+ /*
+ * XXX force a full drop of the npx. The above only drops it if we
+ * owned it. npxgetregs() has the same bug in the !cpu_fxsr case.
+ *
+ * XXX I don't much like npxgetregs()'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 npxgetregs()... perhaps we just
+ * have too many layers.
+ */
+ curthread->td_pcb->pcb_flags &= ~(PCB_NPXINITDONE |
+ PCB_NPXUSERINITDONE);
+ 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;
+ 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.
+ */
+ for (i = 0; i < 4; i++) {
+ if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
+ return (EINVAL);
+ if (DBREG_DR7_LEN(dbregs->dr[7], i) == 0x02)
+ 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];
+
+ pcb->pcb_flags |= PCB_DBREGS;
+ }
+
+ return (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_int32_t dr7;
+ u_int32_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);
+}
diff --git a/sys/i386/i386/machdep.c b/sys/i386/i386/machdep.c
--- a/sys/i386/i386/machdep.c
+++ b/sys/i386/i386/machdep.c
@@ -163,11 +163,6 @@
void identify_cpu(void);
static void cpu_startup(void *);
-static void fpstate_drop(struct thread *td);
-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);
/* Intel ICH registers */
@@ -181,13 +176,6 @@
int cold = 1;
-#ifdef COMPAT_43
-static void osendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
-#endif
-#ifdef COMPAT_FREEBSD4
-static void freebsd4_sendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
-#endif
-
long Maxmem = 0;
long realmem = 0;
@@ -304,912 +292,6 @@
cpu_setregs();
}
-/*
- * 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.
- */
-#ifdef COMPAT_43
-static void
-osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
-{
- struct osigframe sf, *fp;
- struct proc *p;
- struct thread *td;
- struct sigacts *psp;
- struct trapframe *regs;
- int sig;
- int oonstack;
-
- 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);
- regs = td->td_frame;
- oonstack = sigonstack(regs->tf_esp);
-
- /* Allocate space for the signal handler context. */
- if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
- SIGISMEMBER(psp->ps_sigonstack, sig)) {
- fp = (struct osigframe *)((uintptr_t)td->td_sigstk.ss_sp +
- td->td_sigstk.ss_size - sizeof(struct osigframe));
-#if defined(COMPAT_43)
- td->td_sigstk.ss_flags |= SS_ONSTACK;
-#endif
- } else
- fp = (struct osigframe *)regs->tf_esp - 1;
-
- /* Build the argument list for the signal handler. */
- sf.sf_signum = sig;
- sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
- bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo));
- if (SIGISMEMBER(psp->ps_siginfo, sig)) {
- /* Signal handler installed with SA_SIGINFO. */
- sf.sf_arg2 = (register_t)&fp->sf_siginfo;
- sf.sf_siginfo.si_signo = sig;
- sf.sf_siginfo.si_code = ksi->ksi_code;
- sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher;
- sf.sf_addr = 0;
- } else {
- /* Old FreeBSD-style arguments. */
- sf.sf_arg2 = ksi->ksi_code;
- sf.sf_addr = (register_t)ksi->ksi_addr;
- sf.sf_ahu.sf_handler = catcher;
- }
- mtx_unlock(&psp->ps_mtx);
- PROC_UNLOCK(p);
-
- /* Save most if not all of trap frame. */
- sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax;
- sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx;
- sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx;
- sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx;
- sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi;
- sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi;
- sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
- sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
- sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
- sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
- sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
- sf.sf_siginfo.si_sc.sc_gs = rgs();
- sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp;
-
- /* Build the signal context to be used by osigreturn(). */
- sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
- SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
- sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp;
- sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp;
- sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip;
- sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags;
- sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
- sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
-
- /*
- * If we're a vm86 process, we want to save the segment registers.
- * We also change eflags to be our emulated eflags, not the actual
- * eflags.
- */
- if (regs->tf_eflags & PSL_VM) {
- /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */
- struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
- struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
-
- sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs;
- sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs;
- sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es;
- sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds;
-
- if (vm86->vm86_has_vme == 0)
- sf.sf_siginfo.si_sc.sc_ps =
- (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
- (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
-
- /* See sendsig() for comments. */
- tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
- }
-
- /*
- * Copy the sigframe out to the user's stack.
- */
- if (copyout(&sf, fp, sizeof(*fp)) != 0) {
- PROC_LOCK(p);
- sigexit(td, SIGILL);
- }
-
- regs->tf_esp = (int)fp;
- if (p->p_sysent->sv_sigcode_base != 0) {
- regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
- szosigcode;
- } else {
- /* a.out sysentvec does not use shared page */
- regs->tf_eip = p->p_sysent->sv_psstrings - szosigcode;
- }
- regs->tf_eflags &= ~(PSL_T | PSL_D);
- regs->tf_cs = _ucodesel;
- regs->tf_ds = _udatasel;
- regs->tf_es = _udatasel;
- regs->tf_fs = _udatasel;
- load_gs(_udatasel);
- regs->tf_ss = _udatasel;
- PROC_LOCK(p);
- mtx_lock(&psp->ps_mtx);
-}
-#endif /* COMPAT_43 */
-
-#ifdef COMPAT_FREEBSD4
-static void
-freebsd4_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
-{
- struct sigframe4 sf, *sfp;
- struct proc *p;
- struct thread *td;
- struct sigacts *psp;
- struct trapframe *regs;
- int sig;
- int oonstack;
-
- 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);
- regs = td->td_frame;
- oonstack = sigonstack(regs->tf_esp);
-
- /* 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;
- sf.sf_uc.uc_mcontext.mc_gs = rgs();
- bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
- bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
- sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
- bzero(sf.sf_uc.uc_mcontext.__spare__,
- sizeof(sf.sf_uc.uc_mcontext.__spare__));
- bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
-
- /* Allocate space for the signal handler context. */
- if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
- SIGISMEMBER(psp->ps_sigonstack, sig)) {
- sfp = (struct sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
- td->td_sigstk.ss_size - sizeof(struct sigframe4));
-#if defined(COMPAT_43)
- td->td_sigstk.ss_flags |= SS_ONSTACK;
-#endif
- } else
- sfp = (struct sigframe4 *)regs->tf_esp - 1;
-
- /* Build the argument list for the signal handler. */
- sf.sf_signum = sig;
- sf.sf_ucontext = (register_t)&sfp->sf_uc;
- bzero(&sf.sf_si, sizeof(sf.sf_si));
- if (SIGISMEMBER(psp->ps_siginfo, sig)) {
- /* Signal handler installed with SA_SIGINFO. */
- sf.sf_siginfo = (register_t)&sfp->sf_si;
- sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
-
- /* Fill in POSIX parts */
- sf.sf_si.si_signo = sig;
- sf.sf_si.si_code = ksi->ksi_code;
- sf.sf_si.si_addr = ksi->ksi_addr;
- } else {
- /* Old FreeBSD-style arguments. */
- sf.sf_siginfo = ksi->ksi_code;
- sf.sf_addr = (register_t)ksi->ksi_addr;
- sf.sf_ahu.sf_handler = catcher;
- }
- mtx_unlock(&psp->ps_mtx);
- PROC_UNLOCK(p);
-
- /*
- * If we're a vm86 process, we want to save the segment registers.
- * We also change eflags to be our emulated eflags, not the actual
- * eflags.
- */
- if (regs->tf_eflags & PSL_VM) {
- struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
- struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
-
- sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
- sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
- sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
- sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
-
- if (vm86->vm86_has_vme == 0)
- sf.sf_uc.uc_mcontext.mc_eflags =
- (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
- (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
-
- /*
- * Clear PSL_NT to inhibit T_TSSFLT faults on return from
- * syscalls made by the signal handler. This just avoids
- * wasting time for our lazy fixup of such faults. PSL_NT
- * does nothing in vm86 mode, but vm86 programs can set it
- * almost legitimately in probes for old cpu types.
- */
- tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
- }
-
- /*
- * Copy the sigframe out to the user's stack.
- */
- if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
- PROC_LOCK(p);
- sigexit(td, SIGILL);
- }
-
- regs->tf_esp = (int)sfp;
- regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
- szfreebsd4_sigcode;
- regs->tf_eflags &= ~(PSL_T | PSL_D);
- regs->tf_cs = _ucodesel;
- regs->tf_ds = _udatasel;
- regs->tf_es = _udatasel;
- regs->tf_fs = _udatasel;
- regs->tf_ss = _udatasel;
- PROC_LOCK(p);
- mtx_lock(&psp->ps_mtx);
-}
-#endif /* COMPAT_FREEBSD4 */
-
-void
-sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
-{
- struct sigframe sf, *sfp;
- struct proc *p;
- struct thread *td;
- struct sigacts *psp;
- char *sp;
- struct trapframe *regs;
- struct segment_descriptor *sdp;
- char *xfpusave;
- size_t xfpusave_len;
- int sig;
- int oonstack;
-
- 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);
-#ifdef COMPAT_FREEBSD4
- if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
- freebsd4_sendsig(catcher, ksi, mask);
- return;
- }
-#endif
-#ifdef COMPAT_43
- if (SIGISMEMBER(psp->ps_osigset, sig)) {
- osendsig(catcher, ksi, mask);
- return;
- }
-#endif
- regs = td->td_frame;
- oonstack = sigonstack(regs->tf_esp);
-
- if (cpu_max_ext_state_size > sizeof(union savefpu) && use_xsave) {
- xfpusave_len = cpu_max_ext_state_size - sizeof(union 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;
- sf.sf_uc.uc_mcontext.mc_gs = rgs();
- bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, 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);
- /*
- * Unconditionally fill the fsbase and gsbase into the mcontext.
- */
- sdp = &td->td_pcb->pcb_fsd;
- sf.sf_uc.uc_mcontext.mc_fsbase = sdp->sd_hibase << 24 |
- sdp->sd_lobase;
- sdp = &td->td_pcb->pcb_gsd;
- sf.sf_uc.uc_mcontext.mc_gsbase = sdp->sd_hibase << 24 |
- sdp->sd_lobase;
- bzero(sf.sf_uc.uc_mcontext.mc_spare2,
- sizeof(sf.sf_uc.uc_mcontext.mc_spare2));
-
- /* 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_esp - 128;
- if (xfpusave != NULL) {
- sp -= xfpusave_len;
- sp = (char *)((unsigned int)sp & ~0x3F);
- sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
- }
- sp -= sizeof(struct sigframe);
-
- /* Align to 16 bytes. */
- sfp = (struct sigframe *)((unsigned int)sp & ~0xF);
-
- /* Build the argument list for the signal handler. */
- sf.sf_signum = sig;
- sf.sf_ucontext = (register_t)&sfp->sf_uc;
- bzero(&sf.sf_si, sizeof(sf.sf_si));
- if (SIGISMEMBER(psp->ps_siginfo, sig)) {
- /* Signal handler installed with SA_SIGINFO. */
- sf.sf_siginfo = (register_t)&sfp->sf_si;
- 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 */
- } else {
- /* Old FreeBSD-style arguments. */
- sf.sf_siginfo = ksi->ksi_code;
- sf.sf_addr = (register_t)ksi->ksi_addr;
- sf.sf_ahu.sf_handler = catcher;
- }
- mtx_unlock(&psp->ps_mtx);
- PROC_UNLOCK(p);
-
- /*
- * If we're a vm86 process, we want to save the segment registers.
- * We also change eflags to be our emulated eflags, not the actual
- * eflags.
- */
- if (regs->tf_eflags & PSL_VM) {
- struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
- struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
-
- sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
- sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
- sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
- sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
-
- if (vm86->vm86_has_vme == 0)
- sf.sf_uc.uc_mcontext.mc_eflags =
- (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
- (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
-
- /*
- * Clear PSL_NT to inhibit T_TSSFLT faults on return from
- * syscalls made by the signal handler. This just avoids
- * wasting time for our lazy fixup of such faults. PSL_NT
- * does nothing in vm86 mode, but vm86 programs can set it
- * almost legitimately in probes for old cpu types.
- */
- tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
- }
-
- /*
- * 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)) {
- PROC_LOCK(p);
- sigexit(td, SIGILL);
- }
-
- regs->tf_esp = (int)sfp;
- regs->tf_eip = p->p_sysent->sv_sigcode_base;
- if (regs->tf_eip == 0)
- regs->tf_eip = p->p_sysent->sv_psstrings - szsigcode;
- regs->tf_eflags &= ~(PSL_T | PSL_D);
- regs->tf_cs = _ucodesel;
- regs->tf_ds = _udatasel;
- regs->tf_es = _udatasel;
- regs->tf_fs = _udatasel;
- regs->tf_ss = _udatasel;
- 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
- */
-#ifdef COMPAT_43
-int
-osigreturn(td, uap)
- struct thread *td;
- struct osigreturn_args /* {
- struct osigcontext *sigcntxp;
- } */ *uap;
-{
- struct osigcontext sc;
- struct trapframe *regs;
- struct osigcontext *scp;
- int eflags, error;
- ksiginfo_t ksi;
-
- regs = td->td_frame;
- error = copyin(uap->sigcntxp, &sc, sizeof(sc));
- if (error != 0)
- return (error);
- scp = &sc;
- eflags = scp->sc_ps;
- if (eflags & PSL_VM) {
- struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
- struct vm86_kernel *vm86;
-
- /*
- * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
- * set up the vm86 area, and we can't enter vm86 mode.
- */
- if (td->td_pcb->pcb_ext == 0)
- return (EINVAL);
- vm86 = &td->td_pcb->pcb_ext->ext_vm86;
- if (vm86->vm86_inited == 0)
- return (EINVAL);
-
- /* Go back to user mode if both flags are set. */
- if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
- ksiginfo_init_trap(&ksi);
- ksi.ksi_signo = SIGBUS;
- ksi.ksi_code = BUS_OBJERR;
- ksi.ksi_addr = (void *)regs->tf_eip;
- trapsignal(td, &ksi);
- }
-
- if (vm86->vm86_has_vme) {
- eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
- (eflags & VME_USERCHANGE) | PSL_VM;
- } else {
- vm86->vm86_eflags = eflags; /* save VIF, VIP */
- eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
- (eflags & VM_USERCHANGE) | PSL_VM;
- }
- tf->tf_vm86_ds = scp->sc_ds;
- tf->tf_vm86_es = scp->sc_es;
- tf->tf_vm86_fs = scp->sc_fs;
- tf->tf_vm86_gs = scp->sc_gs;
- tf->tf_ds = _udatasel;
- tf->tf_es = _udatasel;
- tf->tf_fs = _udatasel;
- } else {
- /*
- * Don't allow users to change privileged or reserved flags.
- */
- if (!EFL_SECURE(eflags, regs->tf_eflags)) {
- 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.
- */
- if (!CS_SECURE(scp->sc_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_eip;
- trapsignal(td, &ksi);
- return (EINVAL);
- }
- regs->tf_ds = scp->sc_ds;
- regs->tf_es = scp->sc_es;
- regs->tf_fs = scp->sc_fs;
- }
-
- /* Restore remaining registers. */
- regs->tf_eax = scp->sc_eax;
- regs->tf_ebx = scp->sc_ebx;
- regs->tf_ecx = scp->sc_ecx;
- regs->tf_edx = scp->sc_edx;
- regs->tf_esi = scp->sc_esi;
- regs->tf_edi = scp->sc_edi;
- regs->tf_cs = scp->sc_cs;
- regs->tf_ss = scp->sc_ss;
- regs->tf_isp = scp->sc_isp;
- regs->tf_ebp = scp->sc_fp;
- regs->tf_esp = scp->sc_sp;
- regs->tf_eip = scp->sc_pc;
- regs->tf_eflags = eflags;
-
-#if defined(COMPAT_43)
- if (scp->sc_onstack & 1)
- td->td_sigstk.ss_flags |= SS_ONSTACK;
- else
- td->td_sigstk.ss_flags &= ~SS_ONSTACK;
-#endif
- kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
- SIGPROCMASK_OLD);
- return (EJUSTRETURN);
-}
-#endif /* COMPAT_43 */
-
-#ifdef COMPAT_FREEBSD4
-/*
- * MPSAFE
- */
-int
-freebsd4_sigreturn(td, uap)
- struct thread *td;
- struct freebsd4_sigreturn_args /* {
- const ucontext4 *sigcntxp;
- } */ *uap;
-{
- struct ucontext4 uc;
- struct trapframe *regs;
- struct ucontext4 *ucp;
- int cs, eflags, error;
- ksiginfo_t ksi;
-
- error = copyin(uap->sigcntxp, &uc, sizeof(uc));
- if (error != 0)
- return (error);
- ucp = &uc;
- regs = td->td_frame;
- eflags = ucp->uc_mcontext.mc_eflags;
- if (eflags & PSL_VM) {
- struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
- struct vm86_kernel *vm86;
-
- /*
- * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
- * set up the vm86 area, and we can't enter vm86 mode.
- */
- if (td->td_pcb->pcb_ext == 0)
- return (EINVAL);
- vm86 = &td->td_pcb->pcb_ext->ext_vm86;
- if (vm86->vm86_inited == 0)
- return (EINVAL);
-
- /* Go back to user mode if both flags are set. */
- if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
- ksiginfo_init_trap(&ksi);
- ksi.ksi_signo = SIGBUS;
- ksi.ksi_code = BUS_OBJERR;
- ksi.ksi_addr = (void *)regs->tf_eip;
- trapsignal(td, &ksi);
- }
- if (vm86->vm86_has_vme) {
- eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
- (eflags & VME_USERCHANGE) | PSL_VM;
- } else {
- vm86->vm86_eflags = eflags; /* save VIF, VIP */
- eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
- (eflags & VM_USERCHANGE) | PSL_VM;
- }
- bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
- tf->tf_eflags = eflags;
- tf->tf_vm86_ds = tf->tf_ds;
- tf->tf_vm86_es = tf->tf_es;
- tf->tf_vm86_fs = tf->tf_fs;
- tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
- tf->tf_ds = _udatasel;
- tf->tf_es = _udatasel;
- tf->tf_fs = _udatasel;
- } else {
- /*
- * Don't allow users to change privileged or reserved flags.
- */
- if (!EFL_SECURE(eflags, regs->tf_eflags)) {
- uprintf("pid %d (%s): freebsd4_sigreturn eflags = 0x%x\n",
- td->td_proc->p_pid, td->td_name, eflags);
- 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): freebsd4_sigreturn cs = 0x%x\n",
- td->td_proc->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_eip;
- trapsignal(td, &ksi);
- return (EINVAL);
- }
-
- bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
- }
-
-#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);
-}
-#endif /* COMPAT_FREEBSD4 */
-
-/*
- * MPSAFE
- */
-int
-sys_sigreturn(td, uap)
- struct thread *td;
- struct sigreturn_args /* {
- const struct __ucontext *sigcntxp;
- } */ *uap;
-{
- ucontext_t uc;
- struct proc *p;
- struct trapframe *regs;
- ucontext_t *ucp;
- char *xfpustate;
- size_t xfpustate_len;
- int cs, eflags, error, ret;
- ksiginfo_t ksi;
-
- p = td->td_proc;
-
- error = copyin(uap->sigcntxp, &uc, sizeof(uc));
- if (error != 0)
- 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;
- eflags = ucp->uc_mcontext.mc_eflags;
- if (eflags & PSL_VM) {
- struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
- struct vm86_kernel *vm86;
-
- /*
- * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
- * set up the vm86 area, and we can't enter vm86 mode.
- */
- if (td->td_pcb->pcb_ext == 0)
- return (EINVAL);
- vm86 = &td->td_pcb->pcb_ext->ext_vm86;
- if (vm86->vm86_inited == 0)
- return (EINVAL);
-
- /* Go back to user mode if both flags are set. */
- if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
- ksiginfo_init_trap(&ksi);
- ksi.ksi_signo = SIGBUS;
- ksi.ksi_code = BUS_OBJERR;
- ksi.ksi_addr = (void *)regs->tf_eip;
- trapsignal(td, &ksi);
- }
-
- if (vm86->vm86_has_vme) {
- eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
- (eflags & VME_USERCHANGE) | PSL_VM;
- } else {
- vm86->vm86_eflags = eflags; /* save VIF, VIP */
- eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
- (eflags & VM_USERCHANGE) | PSL_VM;
- }
- bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
- tf->tf_eflags = eflags;
- tf->tf_vm86_ds = tf->tf_ds;
- tf->tf_vm86_es = tf->tf_es;
- tf->tf_vm86_fs = tf->tf_fs;
- tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
- tf->tf_ds = _udatasel;
- tf->tf_es = _udatasel;
- tf->tf_fs = _udatasel;
- } else {
- /*
- * Don't allow users to change privileged or reserved flags.
- */
- if (!EFL_SECURE(eflags, regs->tf_eflags)) {
- uprintf("pid %d (%s): sigreturn eflags = 0x%x\n",
- td->td_proc->p_pid, td->td_name, eflags);
- 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",
- td->td_proc->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_eip;
- 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(union 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)
- return (ret);
- bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
- }
-
-#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_43
-static void
-setup_priv_lcall_gate(struct proc *p)
-{
- struct i386_ldt_args uap;
- union descriptor desc;
- u_int lcall_addr;
-
- bzero(&uap, sizeof(uap));
- uap.start = 0;
- uap.num = 1;
- lcall_addr = p->p_sysent->sv_psstrings - sz_lcall_tramp;
- bzero(&desc, sizeof(desc));
- desc.sd.sd_type = SDT_MEMERA;
- desc.sd.sd_dpl = SEL_UPL;
- desc.sd.sd_p = 1;
- desc.sd.sd_def32 = 1;
- desc.sd.sd_gran = 1;
- desc.sd.sd_lolimit = 0xffff;
- desc.sd.sd_hilimit = 0xf;
- desc.sd.sd_lobase = lcall_addr;
- desc.sd.sd_hibase = lcall_addr >> 24;
- i386_set_ldt(curthread, &uap, &desc);
-}
-#endif
-
-/*
- * Reset the hardware debug registers if they were in use.
- * They won't have any meaning for the newly exec'd process.
- */
-void
-x86_clear_dbregs(struct pcb *pcb)
-{
- if ((pcb->pcb_flags & PCB_DBREGS) == 0)
- return;
-
- 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();
- }
- pcb->pcb_flags &= ~PCB_DBREGS;
-}
-
-/*
- * 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_eflags;
-
- regs = td->td_frame;
- pcb = td->td_pcb;
-
- /* Reset pc->pcb_gs and %gs before possibly invalidating it. */
- pcb->pcb_gs = _udatasel;
- load_gs(_udatasel);
-
- mtx_lock_spin(&dt_lock);
- if (td->td_proc->p_md.md_ldt != NULL)
- user_ldt_free(td);
- else
- mtx_unlock_spin(&dt_lock);
-
-#ifdef COMPAT_43
- if (td->td_proc->p_sysent->sv_psstrings !=
- elf32_freebsd_sysvec.sv_psstrings)
- setup_priv_lcall_gate(td->td_proc);
-#endif
-
- /*
- * Reset the fs and gs bases. The values from the old address
- * space do not make sense for the new program. In particular,
- * gsbase might be the TLS base for the old program but the new
- * program has no TLS now.
- */
- set_fsbase(td, 0);
- set_gsbase(td, 0);
-
- /* Make sure edx is 0x0 on entry. Linux binaries depend on it. */
- saved_eflags = regs->tf_eflags & PSL_T;
- bzero((char *)regs, sizeof(struct trapframe));
- regs->tf_eip = imgp->entry_addr;
- regs->tf_esp = stack;
- regs->tf_eflags = PSL_USER | saved_eflags;
- regs->tf_ss = _udatasel;
- regs->tf_ds = _udatasel;
- regs->tf_es = _udatasel;
- regs->tf_fs = _udatasel;
- regs->tf_cs = _ucodesel;
-
- /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
- regs->tf_ebx = (register_t)imgp->ps_strings;
-
- x86_clear_dbregs(pcb);
-
- pcb->pcb_initial_npxcw = __INITIAL_NPXCW__;
-
- /*
- * 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)
{
@@ -2759,479 +1841,6 @@
pcb->pcb_gs = rgs();
}
-int
-ptrace_set_pc(struct thread *td, u_long addr)
-{
-
- td->td_frame->tf_eip = addr;
- return (0);
-}
-
-int
-ptrace_single_step(struct thread *td)
-{
-
- PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
- if ((td->td_frame->tf_eflags & PSL_T) == 0) {
- td->td_frame->tf_eflags |= 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_eflags &= ~PSL_T;
- td->td_dbgflags &= ~TDB_STEP;
- return (0);
-}
-
-int
-fill_regs(struct thread *td, struct reg *regs)
-{
- struct pcb *pcb;
- struct trapframe *tp;
-
- tp = td->td_frame;
- pcb = td->td_pcb;
- regs->r_gs = pcb->pcb_gs;
- return (fill_frame_regs(tp, regs));
-}
-
-int
-fill_frame_regs(struct trapframe *tp, struct reg *regs)
-{
-
- regs->r_fs = tp->tf_fs;
- regs->r_es = tp->tf_es;
- regs->r_ds = tp->tf_ds;
- regs->r_edi = tp->tf_edi;
- regs->r_esi = tp->tf_esi;
- regs->r_ebp = tp->tf_ebp;
- regs->r_ebx = tp->tf_ebx;
- regs->r_edx = tp->tf_edx;
- regs->r_ecx = tp->tf_ecx;
- regs->r_eax = tp->tf_eax;
- regs->r_eip = tp->tf_eip;
- regs->r_cs = tp->tf_cs;
- regs->r_eflags = tp->tf_eflags;
- regs->r_esp = tp->tf_esp;
- regs->r_ss = tp->tf_ss;
- regs->r_err = 0;
- regs->r_trapno = 0;
- return (0);
-}
-
-int
-set_regs(struct thread *td, struct reg *regs)
-{
- struct pcb *pcb;
- struct trapframe *tp;
-
- tp = td->td_frame;
- if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
- !CS_SECURE(regs->r_cs))
- return (EINVAL);
- pcb = td->td_pcb;
- tp->tf_fs = regs->r_fs;
- tp->tf_es = regs->r_es;
- tp->tf_ds = regs->r_ds;
- tp->tf_edi = regs->r_edi;
- tp->tf_esi = regs->r_esi;
- tp->tf_ebp = regs->r_ebp;
- tp->tf_ebx = regs->r_ebx;
- tp->tf_edx = regs->r_edx;
- tp->tf_ecx = regs->r_ecx;
- tp->tf_eax = regs->r_eax;
- tp->tf_eip = regs->r_eip;
- tp->tf_cs = regs->r_cs;
- tp->tf_eflags = regs->r_eflags;
- tp->tf_esp = regs->r_esp;
- tp->tf_ss = regs->r_ss;
- pcb->pcb_gs = regs->r_gs;
- return (0);
-}
-
-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));
- npxgetregs(td);
- if (cpu_fxsr)
- npx_fill_fpregs_xmm(&get_pcb_user_save_td(td)->sv_xmm,
- (struct save87 *)fpregs);
- else
- bcopy(&get_pcb_user_save_td(td)->sv_87, fpregs,
- sizeof(*fpregs));
- return (0);
-}
-
-int
-set_fpregs(struct thread *td, struct fpreg *fpregs)
-{
-
- critical_enter();
- if (cpu_fxsr)
- npx_set_fpregs_xmm((struct save87 *)fpregs,
- &get_pcb_user_save_td(td)->sv_xmm);
- else
- bcopy(fpregs, &get_pcb_user_save_td(td)->sv_87,
- sizeof(*fpregs));
- npxuserinited(td);
- critical_exit();
- return (0);
-}
-
-/*
- * Get machine context.
- */
-int
-get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
-{
- struct trapframe *tp;
- struct segment_descriptor *sdp;
-
- tp = td->td_frame;
-
- PROC_LOCK(curthread->td_proc);
- mcp->mc_onstack = sigonstack(tp->tf_esp);
- PROC_UNLOCK(curthread->td_proc);
- mcp->mc_gs = td->td_pcb->pcb_gs;
- mcp->mc_fs = tp->tf_fs;
- mcp->mc_es = tp->tf_es;
- mcp->mc_ds = tp->tf_ds;
- mcp->mc_edi = tp->tf_edi;
- mcp->mc_esi = tp->tf_esi;
- mcp->mc_ebp = tp->tf_ebp;
- mcp->mc_isp = tp->tf_isp;
- mcp->mc_eflags = tp->tf_eflags;
- if (flags & GET_MC_CLEAR_RET) {
- mcp->mc_eax = 0;
- mcp->mc_edx = 0;
- mcp->mc_eflags &= ~PSL_C;
- } else {
- mcp->mc_eax = tp->tf_eax;
- mcp->mc_edx = tp->tf_edx;
- }
- mcp->mc_ebx = tp->tf_ebx;
- mcp->mc_ecx = tp->tf_ecx;
- mcp->mc_eip = tp->tf_eip;
- mcp->mc_cs = tp->tf_cs;
- mcp->mc_esp = tp->tf_esp;
- mcp->mc_ss = tp->tf_ss;
- mcp->mc_len = sizeof(*mcp);
- get_fpcontext(td, mcp, NULL, 0);
- sdp = &td->td_pcb->pcb_fsd;
- mcp->mc_fsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
- sdp = &td->td_pcb->pcb_gsd;
- mcp->mc_gsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
- mcp->mc_flags = 0;
- mcp->mc_xfpustate = 0;
- mcp->mc_xfpustate_len = 0;
- bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
- 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 trapframe *tp;
- char *xfpustate;
- int eflags, ret;
-
- tp = td->td_frame;
- if (mcp->mc_len != sizeof(*mcp) ||
- (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
- return (EINVAL);
- eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
- (tp->tf_eflags & ~PSL_USERCHANGE);
- if (mcp->mc_flags & _MC_HASFPXSTATE) {
- if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
- sizeof(union 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_fs = mcp->mc_fs;
- tp->tf_es = mcp->mc_es;
- tp->tf_ds = mcp->mc_ds;
- tp->tf_edi = mcp->mc_edi;
- tp->tf_esi = mcp->mc_esi;
- tp->tf_ebp = mcp->mc_ebp;
- tp->tf_ebx = mcp->mc_ebx;
- tp->tf_edx = mcp->mc_edx;
- tp->tf_ecx = mcp->mc_ecx;
- tp->tf_eax = mcp->mc_eax;
- tp->tf_eip = mcp->mc_eip;
- tp->tf_eflags = eflags;
- tp->tf_esp = mcp->mc_esp;
- tp->tf_ss = mcp->mc_ss;
- td->td_pcb->pcb_gs = mcp->mc_gs;
- 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 = npxgetregs(td);
- bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
- sizeof(mcp->mc_fpstate));
- mcp->mc_fpformat = npxformat();
- if (!use_xsave || xfpusave_len == 0)
- return;
- max_len = cpu_max_ext_state_size - sizeof(union 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_387 &&
- 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 = npxsetregs(td, (union savefpu *)&mcp->mc_fpstate,
- xfpustate, xfpustate_len);
- } else
- return (EINVAL);
- return (error);
-}
-
-static 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)
- npxdrop();
- /*
- * XXX force a full drop of the npx. The above only drops it if we
- * owned it. npxgetregs() has the same bug in the !cpu_fxsr case.
- *
- * XXX I don't much like npxgetregs()'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 npxgetregs()... perhaps we just
- * have too many layers.
- */
- curthread->td_pcb->pcb_flags &= ~(PCB_NPXINITDONE |
- PCB_NPXUSERINITDONE);
- 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;
- 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.
- */
- for (i = 0; i < 4; i++) {
- if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
- return (EINVAL);
- if (DBREG_DR7_LEN(dbregs->dr[7], i) == 0x02)
- 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];
-
- pcb->pcb_flags |= PCB_DBREGS;
- }
-
- return (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_int32_t dr7;
- u_int32_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;
-}
-
#ifdef KDB
/*
diff --git a/sys/i386/i386/ptrace_machdep.c b/sys/i386/i386/ptrace_machdep.c
--- a/sys/i386/i386/ptrace_machdep.c
+++ b/sys/i386/i386/ptrace_machdep.c
@@ -34,7 +34,9 @@
#include <sys/param.h>
#include <sys/systm.h>
+#include <sys/lock.h>
#include <sys/malloc.h>
+#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/ptrace.h>
#include <machine/frame.h>
@@ -196,3 +198,33 @@
return (error);
}
+
+int
+ptrace_set_pc(struct thread *td, u_long addr)
+{
+
+ td->td_frame->tf_eip = addr;
+ return (0);
+}
+
+int
+ptrace_single_step(struct thread *td)
+{
+
+ PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
+ if ((td->td_frame->tf_eflags & PSL_T) == 0) {
+ td->td_frame->tf_eflags |= 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_eflags &= ~PSL_T;
+ td->td_dbgflags &= ~TDB_STEP;
+ return (0);
+}

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