diff options
Diffstat (limited to 'lib/libkvm/kvm_minidump_i386.c')
-rw-r--r-- | lib/libkvm/kvm_minidump_i386.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_minidump_i386.c b/lib/libkvm/kvm_minidump_i386.c new file mode 100644 index 000000000000..65fd1f43e21e --- /dev/null +++ b/lib/libkvm/kvm_minidump_i386.c @@ -0,0 +1,344 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2006 Peter Wemm + * + * 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 <sys/cdefs.h> +/* + * i386 machine dependent routines for kvm and minidumps. + */ + +#include <sys/param.h> +#include <sys/endian.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <vm/vm.h> +#include <kvm.h> + +#include "../../sys/i386/include/minidump.h" + +#include <limits.h> + +#include "kvm_private.h" +#include "kvm_i386.h" + +#define i386_round_page(x) roundup2((kvaddr_t)(x), I386_PAGE_SIZE) + +struct vmstate { + struct minidumphdr hdr; +}; + +static i386_pte_pae_t +_i386_pte_pae_get(kvm_t *kd, u_long pteindex) +{ + i386_pte_pae_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte)); + + return le64toh(*pte); +} + +static i386_pte_t +_i386_pte_get(kvm_t *kd, u_long pteindex) +{ + i386_pte_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte)); + + return le32toh(*pte); +} + +static int +_i386_minidump_probe(kvm_t *kd) +{ + + return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) && + _kvm_is_minidump(kd)); +} + +static void +_i386_minidump_freevtop(kvm_t *kd) +{ + struct vmstate *vm = kd->vmst; + + free(vm); + kd->vmst = NULL; +} + +static int +_i386_minidump_initvtop(kvm_t *kd) +{ + struct vmstate *vmst; + off_t off, dump_avail_off, sparse_off; + + vmst = _kvm_malloc(kd, sizeof(*vmst)); + if (vmst == NULL) { + _kvm_err(kd, kd->program, "cannot allocate vm"); + return (-1); + } + kd->vmst = vmst; + if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) != + sizeof(vmst->hdr)) { + _kvm_err(kd, kd->program, "cannot read dump header"); + return (-1); + } + if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) { + _kvm_err(kd, kd->program, "not a minidump for this platform"); + return (-1); + } + vmst->hdr.version = le32toh(vmst->hdr.version); + if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) { + _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d", + MINIDUMP_VERSION, vmst->hdr.version); + return (-1); + } + vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize); + vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize); + vmst->hdr.ptesize = le32toh(vmst->hdr.ptesize); + vmst->hdr.kernbase = le32toh(vmst->hdr.kernbase); + vmst->hdr.paemode = le32toh(vmst->hdr.paemode); + vmst->hdr.dumpavailsize = vmst->hdr.version == MINIDUMP_VERSION ? + le32toh(vmst->hdr.dumpavailsize) : 0; + + /* Skip header and msgbuf */ + dump_avail_off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize); + + /* Skip dump_avail */ + off = dump_avail_off + i386_round_page(vmst->hdr.dumpavailsize); + + sparse_off = off + i386_round_page(vmst->hdr.bitmapsize) + + i386_round_page(vmst->hdr.ptesize); + if (_kvm_pt_init(kd, vmst->hdr.dumpavailsize, dump_avail_off, + vmst->hdr.bitmapsize, off, sparse_off, I386_PAGE_SIZE) == -1) { + return (-1); + } + off += i386_round_page(vmst->hdr.bitmapsize); + + if (_kvm_pmap_init(kd, vmst->hdr.ptesize, off) == -1) { + return (-1); + } + off += i386_round_page(vmst->hdr.ptesize); + + return (0); +} + +static int +_i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa) +{ + struct vmstate *vm; + i386_physaddr_pae_t offset; + i386_pte_pae_t pte; + kvaddr_t pteindex; + i386_physaddr_pae_t a; + off_t ofs; + + vm = kd->vmst; + offset = va & I386_PAGE_MASK; + + if (va >= vm->hdr.kernbase) { + pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; + if (pteindex >= vm->hdr.ptesize / sizeof(pte)) + goto invalid; + pte = _i386_pte_pae_get(kd, pteindex); + if ((pte & I386_PG_V) == 0) { + _kvm_err(kd, kd->program, + "_i386_minidump_vatop_pae: pte not valid"); + goto invalid; + } + a = pte & I386_PG_FRAME_PAE; + ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE); + if (ofs == -1) { + _kvm_err(kd, kd->program, + "_i386_minidump_vatop_pae: physical address 0x%jx not in minidump", + (uintmax_t)a); + goto invalid; + } + *pa = ofs + offset; + return (I386_PAGE_SIZE - offset); + } else { + _kvm_err(kd, kd->program, + "_i386_minidump_vatop_pae: virtual address 0x%jx not minidumped", + (uintmax_t)va); + goto invalid; + } + +invalid: + _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); + return (0); +} + +static int +_i386_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa) +{ + struct vmstate *vm; + i386_physaddr_t offset; + i386_pte_t pte; + kvaddr_t pteindex; + i386_physaddr_t a; + off_t ofs; + + vm = kd->vmst; + offset = va & I386_PAGE_MASK; + + if (va >= vm->hdr.kernbase) { + pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; + if (pteindex >= vm->hdr.ptesize / sizeof(pte)) + goto invalid; + pte = _i386_pte_get(kd, pteindex); + if ((pte & I386_PG_V) == 0) { + _kvm_err(kd, kd->program, + "_i386_minidump_vatop: pte not valid"); + goto invalid; + } + a = pte & I386_PG_FRAME; + ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE); + if (ofs == -1) { + _kvm_err(kd, kd->program, + "_i386_minidump_vatop: physical address 0x%jx not in minidump", + (uintmax_t)a); + goto invalid; + } + *pa = ofs + offset; + return (I386_PAGE_SIZE - offset); + } else { + _kvm_err(kd, kd->program, + "_i386_minidump_vatop: virtual address 0x%jx not minidumped", + (uintmax_t)va); + goto invalid; + } + +invalid: + _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); + return (0); +} + +static int +_i386_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) +{ + + if (ISALIVE(kd)) { + _kvm_err(kd, 0, "_i386_minidump_kvatop called in live kernel!"); + return (0); + } + if (kd->vmst->hdr.paemode) + return (_i386_minidump_vatop_pae(kd, va, pa)); + else + return (_i386_minidump_vatop(kd, va, pa)); +} + +static vm_prot_t +_i386_entry_to_prot(uint64_t pte) +{ + vm_prot_t prot = VM_PROT_READ; + + /* Source: i386/pmap.c:pmap_protect() */ + if (pte & I386_PG_RW) + prot |= VM_PROT_WRITE; + if ((pte & I386_PG_NX) == 0) + prot |= VM_PROT_EXECUTE; + + return prot; +} + +struct i386_iter { + kvm_t *kd; + u_long nptes; + u_long pteindex; +}; + +static void +_i386_iterator_init(struct i386_iter *it, kvm_t *kd) +{ + struct vmstate *vm = kd->vmst; + + it->kd = kd; + it->pteindex = 0; + if (vm->hdr.paemode) { + it->nptes = vm->hdr.ptesize / sizeof(i386_pte_pae_t); + } else { + it->nptes = vm->hdr.ptesize / sizeof(i386_pte_t); + } + return; +} + +static int +_i386_iterator_next(struct i386_iter *it, u_long *pa, u_long *va, u_long *dva, + vm_prot_t *prot) +{ + struct vmstate *vm = it->kd->vmst; + i386_pte_t pte32; + i386_pte_pae_t pte64; + int found = 0; + + *dva = 0; + *pa = 0; + *va = 0; + *dva = 0; + *prot = 0; + for (; it->pteindex < it->nptes && found == 0; it->pteindex++) { + if (vm->hdr.paemode) { + pte64 = _i386_pte_pae_get(it->kd, it->pteindex); + if ((pte64 & I386_PG_V) == 0) + continue; + *prot = _i386_entry_to_prot(pte64); + *pa = pte64 & I386_PG_FRAME_PAE; + } else { + pte32 = _i386_pte_get(it->kd, it->pteindex); + if ((pte32 & I386_PG_V) == 0) + continue; + *prot = _i386_entry_to_prot(pte32); + *pa = pte32 & I386_PG_FRAME; + } + *va = vm->hdr.kernbase + (it->pteindex << I386_PAGE_SHIFT); + found = 1; + } + return found; +} + +static int +_i386_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg) +{ + struct i386_iter it; + u_long dva, pa, va; + vm_prot_t prot; + + _i386_iterator_init(&it, kd); + while (_i386_iterator_next(&it, &pa, &va, &dva, &prot)) { + if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva, + prot, I386_PAGE_SIZE, 0)) { + return (0); + } + } + return (1); +} + +static struct kvm_arch kvm_i386_minidump = { + .ka_probe = _i386_minidump_probe, + .ka_initvtop = _i386_minidump_initvtop, + .ka_freevtop = _i386_minidump_freevtop, + .ka_kvatop = _i386_minidump_kvatop, + .ka_native = _i386_native, + .ka_walk_pages = _i386_minidump_walk_pages, +}; + +KVM_ARCH(kvm_i386_minidump); |