256 lines
6.4 KiB
C
256 lines
6.4 KiB
C
/*-
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* Copyright (c) 2006 Peter Wemm
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* AMD64 machine dependent routines for kvm and minidumps.
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*/
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#include <sys/param.h>
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#include <sys/user.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <sys/fnv_hash.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <machine/elf.h>
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#include <machine/cpufunc.h>
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#include <machine/minidump.h>
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#include <limits.h>
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#include "kvm_private.h"
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struct hpte {
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struct hpte *next;
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vm_paddr_t pa;
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int64_t off;
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};
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#define HPT_SIZE 1024
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/* minidump must be the first item! */
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struct vmstate {
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int minidump; /* 1 = minidump mode */
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struct minidumphdr hdr;
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void *hpt_head[HPT_SIZE];
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uint64_t *bitmap;
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uint64_t *ptemap;
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};
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static void
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hpt_insert(kvm_t *kd, vm_paddr_t pa, int64_t off)
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{
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struct hpte *hpte;
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uint32_t fnv = FNV1_32_INIT;
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fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
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fnv &= (HPT_SIZE - 1);
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hpte = malloc(sizeof(*hpte));
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hpte->pa = pa;
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hpte->off = off;
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hpte->next = kd->vmst->hpt_head[fnv];
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kd->vmst->hpt_head[fnv] = hpte;
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}
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static int64_t
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hpt_find(kvm_t *kd, vm_paddr_t pa)
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{
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struct hpte *hpte;
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uint32_t fnv = FNV1_32_INIT;
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fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
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fnv &= (HPT_SIZE - 1);
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for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) {
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if (pa == hpte->pa)
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return (hpte->off);
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}
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return (-1);
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}
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static int
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inithash(kvm_t *kd, uint64_t *base, int len, off_t off)
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{
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uint64_t idx;
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uint64_t bit, bits;
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vm_paddr_t pa;
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for (idx = 0; idx < len / sizeof(*base); idx++) {
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bits = base[idx];
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while (bits) {
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bit = bsfq(bits);
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bits &= ~(1ul << bit);
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pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE;
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hpt_insert(kd, pa, off);
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off += PAGE_SIZE;
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}
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}
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return (off);
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}
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void
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_kvm_minidump_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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if (vm->bitmap)
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free(vm->bitmap);
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if (vm->ptemap)
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free(vm->ptemap);
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free(vm);
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kd->vmst = NULL;
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}
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int
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_kvm_minidump_initvtop(kvm_t *kd)
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{
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u_long pa;
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struct vmstate *vmst;
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off_t off;
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vmst = _kvm_malloc(kd, sizeof(*vmst));
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if (vmst == 0) {
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_kvm_err(kd, kd->program, "cannot allocate vm");
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return (-1);
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}
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kd->vmst = vmst;
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vmst->minidump = 1;
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if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
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sizeof(vmst->hdr)) {
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_kvm_err(kd, kd->program, "cannot read dump header");
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return (-1);
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}
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if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) {
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_kvm_err(kd, kd->program, "not a minidump for this platform");
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return (-1);
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}
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if (vmst->hdr.version != MINIDUMP_VERSION) {
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_kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
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MINIDUMP_VERSION, vmst->hdr.version);
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return (-1);
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}
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/* Skip header and msgbuf */
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off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize);
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vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
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if (vmst->bitmap == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize);
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return (-1);
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}
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if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) !=
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vmst->hdr.bitmapsize) {
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_kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize);
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return (-1);
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}
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off += round_page(vmst->hdr.bitmapsize);
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vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
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if (vmst->ptemap == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize);
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return (-1);
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}
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if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
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vmst->hdr.ptesize) {
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_kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize);
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return (-1);
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}
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off += vmst->hdr.ptesize;
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/* build physical address hash table for sparse pages */
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inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off);
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return (0);
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}
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static int
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_kvm_minidump_vatop(kvm_t *kd, u_long va, off_t *pa)
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{
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struct vmstate *vm;
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u_long offset;
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pt_entry_t pte;
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u_long pteindex;
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int i;
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u_long a;
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off_t ofs;
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vm = kd->vmst;
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offset = va & (PAGE_SIZE - 1);
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if (va >= vm->hdr.kernbase) {
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pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT;
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pte = vm->ptemap[pteindex];
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if (((u_long)pte & PG_V) == 0) {
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_kvm_err(kd, kd->program, "_kvm_vatop: pte not valid");
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goto invalid;
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}
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a = pte & PG_FRAME;
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ofs = hpt_find(kd, a);
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if (ofs == -1) {
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_kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a);
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goto invalid;
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}
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*pa = ofs + offset;
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return (PAGE_SIZE - offset);
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} else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
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a = (va - vm->hdr.dmapbase) & ~PAGE_MASK;
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ofs = hpt_find(kd, a);
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if (ofs == -1) {
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_kvm_err(kd, kd->program, "_kvm_vatop: direct map address 0x%lx not in minidump", va);
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goto invalid;
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}
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*pa = ofs + offset;
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return (PAGE_SIZE - offset);
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} else {
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_kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va);
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goto invalid;
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}
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invalid:
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_kvm_err(kd, 0, "invalid address (0x%lx)", va);
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return (0);
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}
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int
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_kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa)
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{
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0, "kvm_kvatop called in live kernel!");
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return (0);
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}
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return (_kvm_minidump_vatop(kd, va, pa));
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}
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