Index: head/lib/libkvm/kvm_i386.c =================================================================== --- head/lib/libkvm/kvm_i386.c (revision 325734) +++ head/lib/libkvm/kvm_i386.c (revision 325735) @@ -1,430 +1,431 @@ /*- * Copyright (c) 1989, 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software developed by the Computer Systems * Engineering group at Lawrence Berkeley Laboratory under DARPA contract * BG 91-66 and contributed to Berkeley. * * 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. 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. */ #include __FBSDID("$FreeBSD$"); #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; #endif #endif /* LIBC_SCCS and not lint */ /* * i386 machine dependent routines for kvm. Hopefully, the forthcoming * vm code will one day obsolete this module. */ #include #include #include #include #include #include +#include #include #ifdef __i386__ #include /* For KERNBASE. */ #endif #include #include "kvm_private.h" #include "kvm_i386.h" struct vmstate { void *PTD; int pae; size_t phnum; GElf_Phdr *phdr; }; /* * Translate a physical memory address to a file-offset in the crash-dump. */ static size_t _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs) { struct vmstate *vm = kd->vmst; GElf_Phdr *p; size_t n; if (kd->rawdump) { *ofs = pa; return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK)); } p = vm->phdr; n = vm->phnum; while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) p++, n--; if (n == 0) return (0); *ofs = (pa - p->p_paddr) + p->p_offset; return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK)); } static void _i386_freevtop(kvm_t *kd) { struct vmstate *vm = kd->vmst; if (vm->PTD) free(vm->PTD); free(vm->phdr); free(vm); kd->vmst = NULL; } static int _i386_probe(kvm_t *kd) { return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) && !_kvm_is_minidump(kd)); } static int _i386_initvtop(kvm_t *kd) { struct kvm_nlist nl[2]; i386_physaddr_t pa; kvaddr_t kernbase; char *PTD; int i; kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(struct vmstate)); if (kd->vmst == NULL) { _kvm_err(kd, kd->program, "cannot allocate vm"); return (-1); } kd->vmst->PTD = 0; if (kd->rawdump == 0) { if (_kvm_read_core_phdrs(kd, &kd->vmst->phnum, &kd->vmst->phdr) == -1) return (-1); } nl[0].n_name = "kernbase"; nl[1].n_name = 0; if (kvm_nlist2(kd, nl) != 0) { #ifdef __i386__ kernbase = KERNBASE; /* for old kernels */ #else _kvm_err(kd, kd->program, "cannot resolve kernbase"); return (-1); #endif } else kernbase = nl[0].n_value; nl[0].n_name = "IdlePDPT"; nl[1].n_name = 0; if (kvm_nlist2(kd, nl) == 0) { i386_physaddr_pae_t pa64; if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa, sizeof(pa)) != sizeof(pa)) { _kvm_err(kd, kd->program, "cannot read IdlePDPT"); return (-1); } pa = le32toh(pa); PTD = _kvm_malloc(kd, 4 * I386_PAGE_SIZE); if (PTD == NULL) { _kvm_err(kd, kd->program, "cannot allocate PTD"); return (-1); } for (i = 0; i < 4; i++) { if (kvm_read2(kd, pa + (i * sizeof(pa64)), &pa64, sizeof(pa64)) != sizeof(pa64)) { _kvm_err(kd, kd->program, "Cannot read PDPT"); free(PTD); return (-1); } pa64 = le64toh(pa64); if (kvm_read2(kd, pa64 & I386_PG_FRAME_PAE, PTD + (i * I386_PAGE_SIZE), I386_PAGE_SIZE) != I386_PAGE_SIZE) { _kvm_err(kd, kd->program, "cannot read PDPT"); free(PTD); return (-1); } } kd->vmst->PTD = PTD; kd->vmst->pae = 1; } else { nl[0].n_name = "IdlePTD"; nl[1].n_name = 0; if (kvm_nlist2(kd, nl) != 0) { _kvm_err(kd, kd->program, "bad namelist"); return (-1); } if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa, sizeof(pa)) != sizeof(pa)) { _kvm_err(kd, kd->program, "cannot read IdlePTD"); return (-1); } pa = le32toh(pa); PTD = _kvm_malloc(kd, I386_PAGE_SIZE); if (PTD == NULL) { _kvm_err(kd, kd->program, "cannot allocate PTD"); return (-1); } if (kvm_read2(kd, pa, PTD, I386_PAGE_SIZE) != I386_PAGE_SIZE) { _kvm_err(kd, kd->program, "cannot read PTD"); return (-1); } kd->vmst->PTD = PTD; kd->vmst->pae = 0; } return (0); } static int _i386_vatop(kvm_t *kd, kvaddr_t va, off_t *pa) { struct vmstate *vm; i386_physaddr_t offset; i386_physaddr_t pte_pa; i386_pde_t pde; i386_pte_t pte; kvaddr_t pdeindex; kvaddr_t pteindex; size_t s; i386_physaddr_t a; off_t ofs; i386_pde_t *PTD; vm = kd->vmst; PTD = (i386_pde_t *)vm->PTD; offset = va & I386_PAGE_MASK; /* * If we are initializing (kernel page table descriptor pointer * not yet set) then return pa == va to avoid infinite recursion. */ if (PTD == NULL) { s = _kvm_pa2off(kd, va, pa); if (s == 0) { _kvm_err(kd, kd->program, "_i386_vatop: bootstrap data not in dump"); goto invalid; } else return (I386_PAGE_SIZE - offset); } pdeindex = va >> I386_PDRSHIFT; pde = le32toh(PTD[pdeindex]); if ((pde & I386_PG_V) == 0) { _kvm_err(kd, kd->program, "_i386_vatop: pde not valid"); goto invalid; } if (pde & I386_PG_PS) { /* * No second-level page table; ptd describes one 4MB * page. (We assume that the kernel wouldn't set * PG_PS without enabling it cr0). */ offset = va & I386_PAGE_PS_MASK; a = (pde & I386_PG_PS_FRAME) + offset; s = _kvm_pa2off(kd, a, pa); if (s == 0) { _kvm_err(kd, kd->program, "_i386_vatop: 4MB page address not in dump"); goto invalid; } return (I386_NBPDR - offset); } pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG - 1); pte_pa = (pde & I386_PG_FRAME) + (pteindex * sizeof(pte)); s = _kvm_pa2off(kd, pte_pa, &ofs); if (s < sizeof(pte)) { _kvm_err(kd, kd->program, "_i386_vatop: pte_pa not found"); goto invalid; } /* XXX This has to be a physical address read, kvm_read is virtual */ if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) { _kvm_syserr(kd, kd->program, "_i386_vatop: pread"); goto invalid; } pte = le32toh(pte); if ((pte & I386_PG_V) == 0) { _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid"); goto invalid; } a = (pte & I386_PG_FRAME) + offset; s = _kvm_pa2off(kd, a, pa); if (s == 0) { _kvm_err(kd, kd->program, "_i386_vatop: address not in dump"); goto invalid; } else return (I386_PAGE_SIZE - offset); invalid: _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); return (0); } static int _i386_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa) { struct vmstate *vm; i386_physaddr_pae_t offset; i386_physaddr_pae_t pte_pa; i386_pde_pae_t pde; i386_pte_pae_t pte; kvaddr_t pdeindex; kvaddr_t pteindex; size_t s; i386_physaddr_pae_t a; off_t ofs; i386_pde_pae_t *PTD; vm = kd->vmst; PTD = (i386_pde_pae_t *)vm->PTD; offset = va & I386_PAGE_MASK; /* * If we are initializing (kernel page table descriptor pointer * not yet set) then return pa == va to avoid infinite recursion. */ if (PTD == NULL) { s = _kvm_pa2off(kd, va, pa); if (s == 0) { _kvm_err(kd, kd->program, "_i386_vatop_pae: bootstrap data not in dump"); goto invalid; } else return (I386_PAGE_SIZE - offset); } pdeindex = va >> I386_PDRSHIFT_PAE; pde = le64toh(PTD[pdeindex]); if ((pde & I386_PG_V) == 0) { _kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid"); goto invalid; } if (pde & I386_PG_PS) { /* * No second-level page table; ptd describes one 2MB * page. (We assume that the kernel wouldn't set * PG_PS without enabling it cr0). */ offset = va & I386_PAGE_PS_MASK_PAE; a = (pde & I386_PG_PS_FRAME_PAE) + offset; s = _kvm_pa2off(kd, a, pa); if (s == 0) { _kvm_err(kd, kd->program, "_i386_vatop: 2MB page address not in dump"); goto invalid; } return (I386_NBPDR_PAE - offset); } pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG_PAE - 1); pte_pa = (pde & I386_PG_FRAME_PAE) + (pteindex * sizeof(pde)); s = _kvm_pa2off(kd, pte_pa, &ofs); if (s < sizeof(pte)) { _kvm_err(kd, kd->program, "_i386_vatop_pae: pdpe_pa not found"); goto invalid; } /* XXX This has to be a physical address read, kvm_read is virtual */ if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) { _kvm_syserr(kd, kd->program, "_i386_vatop_pae: read"); goto invalid; } pte = le64toh(pte); if ((pte & I386_PG_V) == 0) { _kvm_err(kd, kd->program, "_i386_vatop_pae: pte not valid"); goto invalid; } a = (pte & I386_PG_FRAME_PAE) + offset; s = _kvm_pa2off(kd, a, pa); if (s == 0) { _kvm_err(kd, kd->program, "_i386_vatop_pae: address not in dump"); goto invalid; } else return (I386_PAGE_SIZE - offset); invalid: _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); return (0); } static int _i386_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) { if (ISALIVE(kd)) { _kvm_err(kd, 0, "vatop called in live kernel!"); return (0); } if (kd->vmst->pae) return (_i386_vatop_pae(kd, va, pa)); else return (_i386_vatop(kd, va, pa)); } int _i386_native(kvm_t *kd __unused) { #ifdef __i386__ return (1); #else return (0); #endif } static struct kvm_arch kvm_i386 = { .ka_probe = _i386_probe, .ka_initvtop = _i386_initvtop, .ka_freevtop = _i386_freevtop, .ka_kvatop = _i386_kvatop, .ka_native = _i386_native, }; KVM_ARCH(kvm_i386);