svn commit: r286953 - head/lib/libkvm
Andrew Turner
andrew at FreeBSD.org
Thu Aug 20 11:07:52 UTC 2015
Author: andrew
Date: Thu Aug 20 11:07:51 2015
New Revision: 286953
URL: https://svnweb.freebsd.org/changeset/base/286953
Log:
Add support to libkvm for reading minidumps on arm64. The kernel side is
missing until it can be cleaned up.
Reviewed by: jhb
Approved by: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3319
Added:
head/lib/libkvm/kvm_minidump_aarch64.c (contents, props changed)
Modified:
head/lib/libkvm/kvm_aarch64.c
head/lib/libkvm/kvm_private.h
Modified: head/lib/libkvm/kvm_aarch64.c
==============================================================================
--- head/lib/libkvm/kvm_aarch64.c Thu Aug 20 08:34:13 2015 (r286952)
+++ head/lib/libkvm/kvm_aarch64.c Thu Aug 20 11:07:51 2015 (r286953)
@@ -1,5 +1,6 @@
/*-
- * Copyright (c) 2014 The FreeBSD Foundation
+ * Copyright (C) 2006 Bruce M. Simpson.
+ * Copyright (c) 2015 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Andrew Turner under
@@ -27,38 +28,78 @@
* SUCH DAMAGE.
*/
+/*
+ * arm64 (AArch64) machine dependent routines for kvm.
+ */
+
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
+#include <sys/mman.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+
+#include <machine/pmap.h>
#include <limits.h>
#include <kvm.h>
-#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
#include "kvm_private.h"
+/* minidump must be the first item! */
+struct vmstate {
+ int minidump; /* 1 = minidump mode */
+ void *mmapbase;
+ size_t mmapsize;
+};
+
void
_kvm_freevtop(kvm_t *kd)
{
- printf("_kvm_freevtop\n");
- abort();
+ if (kd->vmst != 0) {
+ if (kd->vmst->minidump)
+ return (_kvm_minidump_freevtop(kd));
+ if (kd->vmst->mmapbase != NULL)
+ munmap(kd->vmst->mmapbase, kd->vmst->mmapsize);
+ free(kd->vmst);
+ kd->vmst = NULL;
+ }
}
int
_kvm_initvtop(kvm_t *kd)
{
+ char minihdr[8];
+
+ if (!kd->rawdump) {
+ if (pread(kd->pmfd, &minihdr, 8, 0) == 8) {
+ if (memcmp(&minihdr, "minidump", 8) == 0)
+ return (_kvm_minidump_initvtop(kd));
+ } else {
+ _kvm_err(kd, kd->program, "cannot read header");
+ return (-1);
+ }
+ }
- printf("_kvm_initvtop\n");
- abort();
+ _kvm_err(kd, 0, "_kvm_initvtop: Unsupported image type");
+ return (-1);
}
int
_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
{
- printf("_kvm_kvatop\n");
- abort();
+ if (kd->vmst->minidump)
+ return _kvm_minidump_kvatop(kd, va, pa);
+
+
+ _kvm_err(kd, 0, "_kvm_kvatop: Unsupported image type");
+ return (0);
}
Added: head/lib/libkvm/kvm_minidump_aarch64.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/lib/libkvm/kvm_minidump_aarch64.c Thu Aug 20 11:07:51 2015 (r286953)
@@ -0,0 +1,269 @@
+/*-
+ * 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.
+ *
+ * From: FreeBSD: src/lib/libkvm/kvm_minidump_amd64.c r261799
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * ARM64 (AArch64) 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 <string.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/pte.h>
+#include <machine/minidump.h>
+
+#include <limits.h>
+#include <stdint.h>
+
+#include "kvm_private.h"
+
+struct hpte {
+ struct hpte *next;
+ vm_paddr_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];
+ uint64_t *bitmap;
+ uint64_t *page_map;
+};
+
+static void
+hpt_insert(kvm_t *kd, vm_paddr_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, vm_paddr_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, uint64_t *base, int len, off_t off)
+{
+ uint64_t idx;
+ uint64_t bit, bits;
+ vm_paddr_t pa;
+
+ for (idx = 0; idx < len / sizeof(*base); idx++) {
+ bits = base[idx];
+ while (bits) {
+ bit = ffsl(bits) - 1;
+ 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;
+
+ free(vm->bitmap);
+ free(vm->page_map);
+ free(vm);
+ kd->vmst = NULL;
+}
+
+int
+_kvm_minidump_initvtop(kvm_t *kd)
+{
+ 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;
+ 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 && vmst->hdr.version != 1) {
+ _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->page_map = _kvm_malloc(kd, vmst->hdr.pmapsize);
+ if (vmst->page_map == NULL) {
+ _kvm_err(kd, kd->program,
+ "cannot allocate %d bytes for page_map",
+ vmst->hdr.pmapsize);
+ return (-1);
+ }
+ /* This is the end of the dump, savecore may have truncated it. */
+ if (pread(kd->pmfd, vmst->page_map, vmst->hdr.pmapsize, off) <
+ PAGE_SIZE) {
+ _kvm_err(kd, kd->program, "cannot read %d bytes for page_map",
+ vmst->hdr.pmapsize);
+ }
+ off += vmst->hdr.pmapsize;
+
+ /* build physical address hash table for sparse pages */
+ inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off);
+
+ 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 l3;
+ u_long l3_index;
+ u_long a;
+ off_t ofs;
+
+ vm = kd->vmst;
+ offset = va & PAGE_MASK;
+
+ if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
+ a = (va - vm->hdr.dmapbase + vm->hdr.dmapphys) & ~PAGE_MASK;
+ ofs = hpt_find(kd, a);
+ if (ofs == -1) {
+ _kvm_err(kd, kd->program, "_kvm_vatop: "
+ "direct map address 0x%lx not in minidump", va);
+ goto invalid;
+ }
+ *pa = ofs + offset;
+ return (PAGE_SIZE - offset);
+ } else if (va >= vm->hdr.kernbase) {
+ l3_index = (va - vm->hdr.kernbase) >> L3_SHIFT;
+ if (l3_index >= vm->hdr.pmapsize / sizeof(*vm->page_map))
+ goto invalid;
+ l3 = vm->page_map[l3_index];
+ if ((l3 & ATTR_DESCR_MASK) != L3_PAGE) {
+ _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
+ goto invalid;
+ }
+ a = l3 & ~ATTR_MASK;
+ 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);
+ }
+ return (_kvm_minidump_vatop(kd, va, pa));
+}
Modified: head/lib/libkvm/kvm_private.h
==============================================================================
--- head/lib/libkvm/kvm_private.h Thu Aug 20 08:34:13 2015 (r286952)
+++ head/lib/libkvm/kvm_private.h Thu Aug 20 11:07:51 2015 (r286953)
@@ -104,8 +104,8 @@ uintptr_t _kvm_vnet_validaddr(kvm_t *, u
int _kvm_dpcpu_initialized(kvm_t *, int);
uintptr_t _kvm_dpcpu_validaddr(kvm_t *, uintptr_t);
-#if defined(__amd64__) || defined(__i386__) || defined(__arm__) || \
- defined(__mips__)
+#if defined(__aarch64__) || defined(__amd64__) || defined(__arm__) || \
+ defined(__i386__) || defined(__mips__)
void _kvm_minidump_freevtop(kvm_t *);
int _kvm_minidump_initvtop(kvm_t *);
int _kvm_minidump_kvatop(kvm_t *, u_long, off_t *);
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