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-rw-r--r--lib/libkvm/kvm_minidump_i386.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_minidump_i386.c b/lib/libkvm/kvm_minidump_i386.c
new file mode 100644
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+++ b/lib/libkvm/kvm_minidump_i386.c
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+/*-
+ * 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>
+__FBSDID("$FreeBSD$");
+
+/*
+ * AMD64 machine dependent routines for kvm and minidumps.
+ */
+
+#include <sys/param.h>
+#include <sys/user.h>
+#include <sys/proc.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/fnv_hash.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <nlist.h>
+#include <kvm.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+
+#include <machine/elf.h>
+#include <machine/cpufunc.h>
+#include <machine/minidump.h>
+
+#include <limits.h>
+
+#include "kvm_private.h"
+
+#define PG_FRAME_PAE (~((uint64_t)PAGE_MASK))
+
+struct hpte {
+ struct hpte *next;
+ uint64_t pa;
+ int64_t off;
+};
+
+#define HPT_SIZE 1024
+
+/* minidump must be the first item! */
+struct vmstate {
+ int minidump; /* 1 = minidump mode */
+ struct minidumphdr hdr;
+ void *hpt_head[HPT_SIZE];
+ uint32_t *bitmap;
+ void *ptemap;
+};
+
+static void
+hpt_insert(kvm_t *kd, uint64_t pa, int64_t off)
+{
+ struct hpte *hpte;
+ uint32_t fnv = FNV1_32_INIT;
+
+ fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
+ fnv &= (HPT_SIZE - 1);
+ hpte = malloc(sizeof(*hpte));
+ hpte->pa = pa;
+ hpte->off = off;
+ hpte->next = kd->vmst->hpt_head[fnv];
+ kd->vmst->hpt_head[fnv] = hpte;
+}
+
+static int64_t
+hpt_find(kvm_t *kd, uint64_t pa)
+{
+ struct hpte *hpte;
+ uint32_t fnv = FNV1_32_INIT;
+
+ fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
+ fnv &= (HPT_SIZE - 1);
+ for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) {
+ if (pa == hpte->pa)
+ return (hpte->off);
+ }
+ return (-1);
+}
+
+static int
+inithash(kvm_t *kd, uint32_t *base, int len, off_t off)
+{
+ uint64_t idx;
+ uint32_t bit, bits;
+ uint64_t pa;
+
+ for (idx = 0; idx < len / sizeof(*base); idx++) {
+ bits = base[idx];
+ while (bits) {
+ bit = bsfl(bits);
+ bits &= ~(1ul << bit);
+ pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE;
+ hpt_insert(kd, pa, off);
+ off += PAGE_SIZE;
+ }
+ }
+ return (off);
+}
+
+void
+_kvm_minidump_freevtop(kvm_t *kd)
+{
+ struct vmstate *vm = kd->vmst;
+
+ if (vm->bitmap)
+ free(vm->bitmap);
+ if (vm->ptemap)
+ free(vm->ptemap);
+ free(vm);
+ kd->vmst = NULL;
+}
+
+int
+_kvm_minidump_initvtop(kvm_t *kd)
+{
+ u_long pa;
+ struct vmstate *vmst;
+ off_t off;
+
+ vmst = _kvm_malloc(kd, sizeof(*vmst));
+ if (vmst == 0) {
+ _kvm_err(kd, kd->program, "cannot allocate vm");
+ return (-1);
+ }
+ kd->vmst = vmst;
+ bzero(vmst, sizeof(*vmst));
+ vmst->minidump = 1;
+ 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);
+ }
+ if (vmst->hdr.version != MINIDUMP_VERSION) {
+ _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
+ MINIDUMP_VERSION, vmst->hdr.version);
+ return (-1);
+ }
+
+ /* Skip header and msgbuf */
+ off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize);
+
+ vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
+ if (vmst->bitmap == NULL) {
+ _kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize);
+ return (-1);
+ }
+ if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) !=
+ vmst->hdr.bitmapsize) {
+ _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize);
+ return (-1);
+ }
+ off += round_page(vmst->hdr.bitmapsize);
+
+ vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
+ if (vmst->ptemap == NULL) {
+ _kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize);
+ return (-1);
+ }
+ if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
+ vmst->hdr.ptesize) {
+ _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize);
+ return (-1);
+ }
+ off += vmst->hdr.ptesize;
+
+ /* build physical address hash table for sparse pages */
+ inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off);
+
+ return (0);
+}
+
+static int
+_kvm_minidump_vatop_pae(kvm_t *kd, u_long va, off_t *pa)
+{
+ struct vmstate *vm;
+ uint64_t offset;
+ uint64_t pte;
+ u_long pteindex;
+ int i;
+ uint64_t a;
+ off_t ofs;
+ uint64_t *ptemap;
+
+ vm = kd->vmst;
+ ptemap = vm->ptemap;
+ offset = va & (PAGE_SIZE - 1);
+
+ if (va >= vm->hdr.kernbase) {
+ pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT;
+ pte = ptemap[pteindex];
+ if ((pte & PG_V) == 0) {
+ _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid");
+ goto invalid;
+ }
+ a = pte & PG_FRAME_PAE;
+ ofs = hpt_find(kd, a);
+ if (ofs == -1) {
+ _kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%llx not in minidump", a);
+ goto invalid;
+ }
+ *pa = ofs + offset;
+ return (PAGE_SIZE - offset);
+ } else {
+ _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va);
+ goto invalid;
+ }
+
+invalid:
+ _kvm_err(kd, 0, "invalid address (0x%lx)", va);
+ return (0);
+}
+
+static int
+_kvm_minidump_vatop(kvm_t *kd, u_long va, off_t *pa)
+{
+ struct vmstate *vm;
+ u_long offset;
+ pt_entry_t pte;
+ u_long pteindex;
+ int i;
+ u_long a;
+ off_t ofs;
+ uint32_t *ptemap;
+
+ vm = kd->vmst;
+ ptemap = vm->ptemap;
+ offset = va & (PAGE_SIZE - 1);
+
+ if (va >= vm->hdr.kernbase) {
+ pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT;
+ pte = ptemap[pteindex];
+ if ((pte & PG_V) == 0) {
+ _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid");
+ goto invalid;
+ }
+ a = pte & PG_FRAME;
+ ofs = hpt_find(kd, a);
+ if (ofs == -1) {
+ _kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a);
+ goto invalid;
+ }
+ *pa = ofs + offset;
+ return (PAGE_SIZE - offset);
+ } else {
+ _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va);
+ goto invalid;
+ }
+
+invalid:
+ _kvm_err(kd, 0, "invalid address (0x%lx)", va);
+ return (0);
+}
+
+int
+_kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa)
+{
+
+ if (ISALIVE(kd)) {
+ _kvm_err(kd, 0, "kvm_kvatop called in live kernel!");
+ return (0);
+ }
+ if (kd->vmst->hdr.paemode)
+ return (_kvm_minidump_vatop_pae(kd, va, pa));
+ else
+ return (_kvm_minidump_vatop(kd, va, pa));
+}
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