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Diffstat (limited to 'lib/libkvm/kvm_minidump_i386.c')
-rw-r--r--lib/libkvm/kvm_minidump_i386.c344
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);