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diskdump.c
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diskdump.c
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/*
* diskdump.c
*
* The diskdump module optionally creates either ELF vmcore
* dumpfiles, or compressed dumpfiles derived from the LKCD format.
* In the case of ELF vmcore files, since they are identical to
* netdump dumpfiles, the facilities in netdump.c are used. For
* compressed dumpfiles, the facilities in this file are used.
*
* Copyright (C) 2004-2014 David Anderson
* Copyright (C) 2004-2014 Red Hat, Inc. All rights reserved.
* Copyright (C) 2005 FUJITSU LIMITED
* Copyright (C) 2005 NEC Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "defs.h"
#include "diskdump.h"
#define BITMAP_SECT_LEN 4096
struct diskdump_data {
char *filename;
ulong flags; /* DISKDUMP_LOCAL, plus anything else... */
int dfd; /* dumpfile file descriptor */
FILE *ofp; /* fprintf(dd->ofp, "xxx"); */
int machine_type; /* machine type identifier */
/* header */
struct disk_dump_header *header;
struct disk_dump_sub_header *sub_header;
struct kdump_sub_header *sub_header_kdump;
unsigned long long max_mapnr; /* 64bit max_mapnr */
size_t data_offset;
int block_size;
int block_shift;
char *bitmap;
off_t bitmap_len;
char *dumpable_bitmap;
int byte, bit;
char *compressed_page; /* copy of compressed page data */
char *curbufptr; /* ptr to uncompressed page buffer */
unsigned char *notes_buf; /* copy of elf notes */
void **nt_prstatus_percpu;
uint num_prstatus_notes;
/* page cache */
struct page_cache_hdr { /* header for each cached page */
uint32_t pg_flags;
uint64_t pg_addr;
char *pg_bufptr;
ulong pg_hit_count;
} page_cache_hdr[DISKDUMP_CACHED_PAGES];
char *page_cache_buf; /* base of cached buffer pages */
int evict_index; /* next page to evict */
ulong evictions; /* total evictions done */
ulong cached_reads;
ulong *valid_pages;
ulong accesses;
};
static struct diskdump_data diskdump_data = { 0 };
static struct diskdump_data *dd = &diskdump_data;
static int get_dump_level(void);
ulong *diskdump_flags = &diskdump_data.flags;
static int __diskdump_memory_dump(FILE *);
static void dump_vmcoreinfo(FILE *);
static void dump_nt_prstatus_offset(FILE *);
static char *vmcoreinfo_read_string(const char *);
static void diskdump_get_osrelease(void);
/* For split dumpfile */
static struct diskdump_data **dd_list = NULL;
static int num_dd = 0;
static int num_dumpfiles = 0;
int dumpfile_is_split(void)
{
return KDUMP_SPLIT();
}
void
map_cpus_to_prstatus_kdump_cmprs(void)
{
void **nt_ptr;
int online, i, j, nrcpus;
size_t size;
if (!(online = get_cpus_online()) || (online == kt->cpus))
return;
if (CRASHDEBUG(1))
error(INFO,
"cpus: %d online: %d NT_PRSTATUS notes: %d (remapping)\n",
kt->cpus, online, dd->num_prstatus_notes);
size = NR_CPUS * sizeof(void *);
nt_ptr = (void **)GETBUF(size);
BCOPY(dd->nt_prstatus_percpu, nt_ptr, size);
BZERO(dd->nt_prstatus_percpu, size);
/*
* Re-populate the array with the notes mapping to online cpus
*/
nrcpus = (kt->kernel_NR_CPUS ? kt->kernel_NR_CPUS : NR_CPUS);
for (i = 0, j = 0; i < nrcpus; i++) {
if (in_cpu_map(ONLINE, i)) {
dd->nt_prstatus_percpu[i] = nt_ptr[j++];
dd->num_prstatus_notes =
MAX(dd->num_prstatus_notes, i+1);
}
}
FREEBUF(nt_ptr);
}
static void
add_diskdump_data(char* name)
{
#define DDL_SIZE 16
int i;
int sz = sizeof(void*);
struct diskdump_data *ddp;
if (dd_list == NULL) {
dd_list = calloc(DDL_SIZE, sz);
num_dd = DDL_SIZE;
} else {
for (i = 0; i < num_dumpfiles; i++) {
ddp = dd_list[i];
if (same_file(ddp->filename, name))
error(FATAL,
"split dumpfiles are identical:\n"
" %s\n %s\n",
ddp->filename, name);
if (memcmp(ddp->header, dd->header,
sizeof(struct disk_dump_header)))
error(FATAL,
"split dumpfiles derived from different vmcores:\n"
" %s\n %s\n",
ddp->filename, name);
}
}
if (num_dumpfiles == num_dd) {
/* expand list */
struct diskdump_data **tmp;
tmp = calloc(num_dd*2, sz);
memcpy(tmp, dd_list, sz*num_dd);
free(dd_list);
dd_list = tmp;
num_dd *= 2;
}
dd_list[num_dumpfiles] = dd;
dd->flags |= DUMPFILE_SPLIT;
dd->filename = name;
if (CRASHDEBUG(1))
fprintf(fp, "%s: start_pfn=%llu, end_pfn=%llu\n", name,
dd->sub_header_kdump->start_pfn_64,
dd->sub_header_kdump->end_pfn_64);
}
static void
clean_diskdump_data(void)
{
int i;
if (dd_list == NULL)
return;
for (i=1; i<num_dumpfiles; i++)
free(dd_list[i]); /* NOTE: dd_list[0] is static dd */
free(dd_list);
dd_list = NULL;
num_dumpfiles = 0;
dd = &diskdump_data;
}
static inline int
get_bit(char *map, int byte, int bit)
{
return map[byte] & (1<<bit);
}
static inline int
page_is_ram(unsigned long nr)
{
return get_bit(dd->bitmap, nr >> 3, nr & 7);
}
static inline int
page_is_dumpable(unsigned long nr)
{
return dd->dumpable_bitmap[nr>>3] & (1 << (nr & 7));
}
static inline int
dump_is_partial(const struct disk_dump_header *header)
{
return header->bitmap_blocks >=
divideup(divideup(dd->max_mapnr, 8), dd->block_size) * 2;
}
static int
open_dump_file(char *file)
{
int fd;
fd = open(file, O_RDONLY);
if (fd < 0) {
error(INFO, "diskdump / compressed kdump: unable to open dump file %s\n", file);
return FALSE;
}
if (KDUMP_SPLIT())
dd = calloc(1, sizeof(*dd));
dd->dfd = fd;
return TRUE;
}
void
process_elf32_notes(void *note_buf, unsigned long size_note)
{
Elf32_Nhdr *nt;
size_t index, len = 0;
int num = 0;
for (index = 0; index < size_note; index += len) {
nt = note_buf + index;
if(nt->n_type == NT_PRSTATUS) {
dd->nt_prstatus_percpu[num] = nt;
num++;
}
len = sizeof(Elf32_Nhdr);
len = roundup(len + nt->n_namesz, 4);
len = roundup(len + nt->n_descsz, 4);
}
if (num > 0) {
pc->flags2 |= ELF_NOTES;
dd->num_prstatus_notes = num;
}
return;
}
void
process_elf64_notes(void *note_buf, unsigned long size_note)
{
Elf64_Nhdr *nt;
size_t index, len = 0;
int num = 0;
for (index = 0; index < size_note; index += len) {
nt = note_buf + index;
if(nt->n_type == NT_PRSTATUS) {
dd->nt_prstatus_percpu[num] = nt;
num++;
}
len = sizeof(Elf64_Nhdr);
len = roundup(len + nt->n_namesz, 4);
len = roundup(len + nt->n_descsz, 4);
}
if (num > 0) {
pc->flags2 |= ELF_NOTES;
dd->num_prstatus_notes = num;
}
return;
}
void
x86_process_elf_notes(void *note_ptr, unsigned long size_note)
{
if (machine_type("X86_64"))
process_elf64_notes(note_ptr, size_note);
else if (machine_type("X86"))
process_elf32_notes(note_ptr, size_note);
}
#if defined(__i386__) && defined(ARM)
/*
* The kdump_sub_header member offsets are different when the crash
* binary is built natively on an ARM host vs. when built with
* "make target=ARM" on an x86/x86_64 host. This is because the
* off_t structure members will be aligned on an 8-byte boundary when
* compiled as an ARM binary -- which will be reflected in the
* kdump_sub_header in a compressed ARM kdump.
*
* When crash is compiled as an x86 binary, these are the
* structure's offsets:
*
* struct kdump_sub_header {
* [0] unsigned long phys_base;
* [4] int dump_level; / header_version 1 and later /
* [8] int split; / header_version 2 and later /
* [12] unsigned long start_pfn; / header_version 2 and later /
* [16] unsigned long end_pfn; / header_version 2 and later /
* [20] off_t offset_vmcoreinfo; / header_version 3 and later /
* [28] unsigned long size_vmcoreinfo; / header_version 3 and later /
* [32] off_t offset_note; / header_version 4 and later /
* [40] unsigned long size_note; / header_version 4 and later /
* [44] off_t offset_eraseinfo; / header_version 5 and later /
* [52] unsigned long size_eraseinfo; / header_version 5 and later /
* [56] unsigned long long start_pfn_64; / header_version 6 and later /
* [64] unsigned long long end_pfn_64; / header_version 6 and later /
* [72] unsigned long long max_mapnr_64; / header_version 6 and later /
* };
*
* But when compiled on an ARM processor, each 64-bit "off_t" would be pushed
* up to an 8-byte boundary:
*
* struct kdump_sub_header {
* [0] unsigned long phys_base;
* [4] int dump_level; / header_version 1 and later /
* [8] int split; / header_version 2 and later /
* [12] unsigned long start_pfn; / header_version 2 and later /
* [16] unsigned long end_pfn; / header_version 2 and later /
* [24] off_t offset_vmcoreinfo; / header_version 3 and later /
* [32] unsigned long size_vmcoreinfo; / header_version 3 and later /
* [40] off_t offset_note; / header_version 4 and later /
* [48] unsigned long size_note; / header_version 4 and later /
* [56] off_t offset_eraseinfo; / header_version 5 and later /
* [64] unsigned long size_eraseinfo; / header_version 5 and later /
* [72] unsigned long long start_pfn_64; / header_version 6 and later /
* [80] unsigned long long end_pfn_64; / header_version 6 and later /
* [88] unsigned long long max_mapnr_64; / header_version 6 and later /
* };
*
*/
struct kdump_sub_header_ARM_target {
unsigned long phys_base;
int dump_level; /* header_version 1 and later */
int split; /* header_version 2 and later */
unsigned long start_pfn; /* header_version 2 and later */
unsigned long end_pfn; /* header_version 2 and later */
int pad1;
off_t offset_vmcoreinfo; /* header_version 3 and later */
unsigned long size_vmcoreinfo; /* header_version 3 and later */
int pad2;
off_t offset_note; /* header_version 4 and later */
unsigned long size_note; /* header_version 4 and later */
int pad3;
off_t offset_eraseinfo; /* header_version 5 and later */
unsigned long size_eraseinfo; /* header_version 5 and later */
int pad4;
unsigned long long start_pfn_64; /* header_version 6 and later */
unsigned long long end_pfn_64; /* header_version 6 and later */
unsigned long long max_mapnr_64; /* header_version 6 and later */
};
static void
arm_kdump_header_adjust(int header_version)
{
struct kdump_sub_header *kdsh;
struct kdump_sub_header_ARM_target *kdsh_ARM_target;
kdsh = dd->sub_header_kdump;
kdsh_ARM_target = (struct kdump_sub_header_ARM_target *)kdsh;
if (header_version >= 3) {
kdsh->offset_vmcoreinfo = kdsh_ARM_target->offset_vmcoreinfo;
kdsh->size_vmcoreinfo = kdsh_ARM_target->size_vmcoreinfo;
}
if (header_version >= 4) {
kdsh->offset_note = kdsh_ARM_target->offset_note;
kdsh->size_note = kdsh_ARM_target->size_note;
}
if (header_version >= 5) {
kdsh->offset_eraseinfo = kdsh_ARM_target->offset_eraseinfo;
kdsh->size_eraseinfo = kdsh_ARM_target->size_eraseinfo;
}
if (header_version >= 6) {
kdsh->start_pfn_64 = kdsh_ARM_target->start_pfn_64;
kdsh->end_pfn_64 = kdsh_ARM_target->end_pfn_64;
kdsh->max_mapnr_64 = kdsh_ARM_target->max_mapnr_64;
} else {
kdsh->start_pfn_64 = kdsh_ARM_target->start_pfn;
kdsh->end_pfn_64 = kdsh_ARM_target->end_pfn;
kdsh->max_mapnr_64 = dd->max_mapnr;
}
}
#endif /* __i386__ && ARM */
static int
read_dump_header(char *file)
{
struct disk_dump_header *header = NULL;
struct disk_dump_sub_header *sub_header = NULL;
struct kdump_sub_header *sub_header_kdump = NULL;
size_t size;
off_t bitmap_len;
char *bufptr;
size_t len;
ssize_t bytes_read;
int block_size = (int)sysconf(_SC_PAGESIZE);
off_t offset;
const off_t failed = (off_t)-1;
ulong pfn;
int i, j, max_sect_len;
int is_split = 0;
if (block_size < 0)
return FALSE;
restart:
if ((header = realloc(header, block_size)) == NULL)
error(FATAL, "diskdump / compressed kdump: cannot malloc block_size buffer\n");
if (FLAT_FORMAT()) {
if (!read_flattened_format(dd->dfd, 0, header, block_size)) {
error(FATAL, "diskdump / compressed kdump: cannot read header\n");
goto err;
}
} else {
if (lseek(dd->dfd, 0, SEEK_SET) == failed) {
if (CRASHDEBUG(1))
error(INFO, "diskdump / compressed kdump: cannot lseek dump header\n");
goto err;
}
if (read(dd->dfd, header, block_size) < block_size) {
if (CRASHDEBUG(1))
error(INFO, "diskdump / compressed kdump: cannot read dump header\n");
goto err;
}
}
/* validate dump header */
if (!memcmp(header->signature, DISK_DUMP_SIGNATURE,
sizeof(header->signature))) {
dd->flags |= DISKDUMP_LOCAL;
} else if (!memcmp(header->signature, KDUMP_SIGNATURE,
sizeof(header->signature))) {
dd->flags |= KDUMP_CMPRS_LOCAL;
if (header->header_version >= 1)
dd->flags |= ERROR_EXCLUDED;
} else {
if (CRASHDEBUG(1))
error(INFO,
"diskdump / compressed kdump: dump does not have panic dump header\n");
goto err;
}
if (CRASHDEBUG(1))
fprintf(fp, "%s: header->utsname.machine: %s\n",
DISKDUMP_VALID() ? "diskdump" : "compressed kdump",
header->utsname.machine);
if (STRNEQ(header->utsname.machine, "i686") &&
machine_type_mismatch(file, "X86", NULL, 0))
goto err;
else if (STRNEQ(header->utsname.machine, "x86_64") &&
machine_type_mismatch(file, "X86_64", NULL, 0))
goto err;
else if (STRNEQ(header->utsname.machine, "ia64") &&
machine_type_mismatch(file, "IA64", NULL, 0))
goto err;
else if (STREQ(header->utsname.machine, "ppc") &&
machine_type_mismatch(file, "PPC", NULL, 0))
goto err;
else if (STREQ(header->utsname.machine, "ppc64") &&
machine_type_mismatch(file, "PPC64", NULL, 0))
goto err;
else if (STRNEQ(header->utsname.machine, "arm") &&
machine_type_mismatch(file, "ARM", NULL, 0))
goto err;
else if (STRNEQ(header->utsname.machine, "s390x") &&
machine_type_mismatch(file, "S390X", NULL, 0))
goto err;
else if (STRNEQ(header->utsname.machine, "aarch64") &&
machine_type_mismatch(file, "ARM64", NULL, 0))
goto err;
if (header->block_size != block_size) {
block_size = header->block_size;
if (CRASHDEBUG(1))
fprintf(fp,
"retrying with different block/page size: %d\n",
header->block_size);
goto restart;
}
dd->block_size = header->block_size;
dd->block_shift = ffs(header->block_size) - 1;
if ((DISKDUMP_VALID() &&
(sizeof(*header) + sizeof(void *) * header->nr_cpus > block_size)) ||
header->nr_cpus <= 0) {
error(WARNING, "%s: invalid nr_cpus value: %d\n",
DISKDUMP_VALID() ? "diskdump" : "compressed kdump",
header->nr_cpus);
if (!machine_type("S390") && !machine_type("S390X") &&
!machine_type("X86") && !machine_type("X86_64")) {
if (DISKDUMP_VALID())
goto err;
}
}
/* read sub header */
offset = (off_t)block_size;
if (DISKDUMP_VALID()) {
if ((sub_header = malloc(block_size)) == NULL)
error(FATAL, "diskdump: cannot malloc sub_header buffer\n");
if (FLAT_FORMAT()) {
if (!read_flattened_format(dd->dfd, offset, sub_header, block_size)) {
error(INFO, "diskdump: cannot read dump sub header\n");
goto err;
}
} else {
if (lseek(dd->dfd, offset, SEEK_SET) == failed) {
error(INFO, "diskdump: cannot lseek dump sub header\n");
goto err;
}
if (read(dd->dfd, sub_header, block_size) < block_size) {
error(INFO, "diskdump: cannot read dump sub header\n");
goto err;
}
}
dd->sub_header = sub_header;
/* the 64bit max_mapnr only exists in sub-header of compressed
* kdump file, if it's not a compressed kdump file, we have to
* use the old 32bit max_mapnr in dumpfile header.
* max_mapnr may be truncated here.
*/
dd->max_mapnr = header->max_mapnr;
} else if (KDUMP_CMPRS_VALID()) {
if ((sub_header_kdump = malloc(block_size)) == NULL)
error(FATAL, "compressed kdump: cannot malloc sub_header_kdump buffer\n");
if (FLAT_FORMAT()) {
if (!read_flattened_format(dd->dfd, offset, sub_header_kdump, block_size)) {
error(INFO, "compressed kdump: cannot read dump sub header\n");
goto err;
}
} else {
if (lseek(dd->dfd, offset, SEEK_SET) == failed) {
error(INFO, "compressed kdump: cannot lseek dump sub header\n");
goto err;
}
if (read(dd->dfd, sub_header_kdump, block_size) < block_size) {
error(INFO, "compressed kdump: cannot read dump sub header\n");
goto err;
}
}
dd->sub_header_kdump = sub_header_kdump;
#if defined(__i386__) && defined(ARM)
arm_kdump_header_adjust(header->header_version);
#endif
/* use 64bit max_mapnr in compressed kdump file sub-header */
if (header->header_version >= 6)
dd->max_mapnr = dd->sub_header_kdump->max_mapnr_64;
else {
dd->sub_header_kdump->start_pfn_64
= dd->sub_header_kdump->start_pfn;
dd->sub_header_kdump->end_pfn_64
= dd->sub_header_kdump->end_pfn;
}
}
if (header->header_version < 6)
dd->max_mapnr = header->max_mapnr;
/* read memory bitmap */
bitmap_len = block_size * header->bitmap_blocks;
dd->bitmap_len = bitmap_len;
offset = (off_t)block_size * (1 + header->sub_hdr_size);
if ((dd->bitmap = malloc(bitmap_len)) == NULL)
error(FATAL, "%s: cannot malloc bitmap buffer\n",
DISKDUMP_VALID() ? "diskdump" : "compressed kdump");
dd->dumpable_bitmap = calloc(bitmap_len, 1);
if (CRASHDEBUG(8))
fprintf(fp, "%s: memory bitmap offset: %llx\n",
DISKDUMP_VALID() ? "diskdump" : "compressed kdump",
(ulonglong)offset);
if (FLAT_FORMAT()) {
if (!read_flattened_format(dd->dfd, offset, dd->bitmap, bitmap_len)) {
error(INFO, "%s: cannot read memory bitmap\n",
DISKDUMP_VALID() ? "diskdump" : "compressed kdump");
goto err;
}
} else {
if (lseek(dd->dfd, offset, SEEK_SET) == failed) {
error(INFO, "%s: cannot lseek memory bitmap\n",
DISKDUMP_VALID() ? "diskdump" : "compressed kdump");
goto err;
}
bufptr = dd->bitmap;
len = bitmap_len;
while (len) {
bytes_read = read(dd->dfd, bufptr, len);
if (bytes_read < 0) {
error(INFO, "%s: cannot read memory bitmap\n",
DISKDUMP_VALID() ? "diskdump"
: "compressed kdump");
goto err;
}
len -= bytes_read;
bufptr += bytes_read;
}
}
if (dump_is_partial(header))
memcpy(dd->dumpable_bitmap, dd->bitmap + bitmap_len/2,
bitmap_len/2);
else
memcpy(dd->dumpable_bitmap, dd->bitmap, bitmap_len);
dd->data_offset
= (1 + header->sub_hdr_size + header->bitmap_blocks)
* header->block_size;
dd->header = header;
if (machine_type("ARM"))
dd->machine_type = EM_ARM;
else if (machine_type("X86"))
dd->machine_type = EM_386;
else if (machine_type("X86_64"))
dd->machine_type = EM_X86_64;
else if (machine_type("IA64"))
dd->machine_type = EM_IA_64;
else if (machine_type("PPC"))
dd->machine_type = EM_PPC;
else if (machine_type("PPC64"))
dd->machine_type = EM_PPC64;
else if (machine_type("S390X"))
dd->machine_type = EM_S390;
else if (machine_type("ARM64"))
dd->machine_type = EM_AARCH64;
else {
error(INFO, "%s: unsupported machine type: %s\n",
DISKDUMP_VALID() ? "diskdump" : "compressed kdump",
MACHINE_TYPE);
goto err;
}
/* process elf notes data */
if (KDUMP_CMPRS_VALID() && !(dd->flags & NO_ELF_NOTES) &&
(dd->header->header_version >= 4) &&
(sub_header_kdump->offset_note) &&
(sub_header_kdump->size_note) && (machdep->process_elf_notes)) {
size = sub_header_kdump->size_note;
offset = sub_header_kdump->offset_note;
if ((dd->notes_buf = malloc(size)) == NULL)
error(FATAL, "compressed kdump: cannot malloc notes"
" buffer\n");
if ((dd->nt_prstatus_percpu = malloc(NR_CPUS * sizeof(void*))) == NULL)
error(FATAL, "compressed kdump: cannot malloc pointer"
" to NT_PRSTATUS notes\n");
if (FLAT_FORMAT()) {
if (!read_flattened_format(dd->dfd, offset, dd->notes_buf, size)) {
error(INFO, "compressed kdump: cannot read notes data"
"\n");
goto err;
}
} else {
if (lseek(dd->dfd, offset, SEEK_SET) == failed) {
error(INFO, "compressed kdump: cannot lseek notes data\n");
goto err;
}
if (read(dd->dfd, dd->notes_buf, size) < size) {
error(INFO, "compressed kdump: cannot read notes data"
"\n");
goto err;
}
}
machdep->process_elf_notes(dd->notes_buf, size);
}
/* Check if dump file contains erasesinfo data */
if (KDUMP_CMPRS_VALID() && (dd->header->header_version >= 5) &&
(sub_header_kdump->offset_eraseinfo) &&
(sub_header_kdump->size_eraseinfo))
pc->flags2 |= ERASEINFO_DATA;
if (KDUMP_CMPRS_VALID() && (dd->header->header_version >= 3) &&
dd->sub_header_kdump->offset_vmcoreinfo &&
dd->sub_header_kdump->size_vmcoreinfo)
pc->flags2 |= VMCOREINFO;
/* For split dumpfile */
if (KDUMP_CMPRS_VALID()) {
is_split = ((dd->header->header_version >= 2) &&
(sub_header_kdump->split));
if ((is_split && (num_dumpfiles != 0) && (dd_list == NULL))||
(!is_split && (num_dumpfiles != 0))) {
clean_diskdump_data();
goto err;
}
if (is_split)
add_diskdump_data(file);
num_dumpfiles++;
}
if (!is_split) {
max_sect_len = divideup(dd->max_mapnr, BITMAP_SECT_LEN);
pfn = 0;
dd->filename = file;
}
else {
unsigned long long start = sub_header_kdump->start_pfn_64;
unsigned long long end = sub_header_kdump->end_pfn_64;
max_sect_len = divideup(end - start + 1, BITMAP_SECT_LEN);
pfn = start;
}
dd->valid_pages = calloc(sizeof(ulong), max_sect_len + 1);
for (i = 1; i < max_sect_len + 1; i++) {
dd->valid_pages[i] = dd->valid_pages[i - 1];
for (j = 0; j < BITMAP_SECT_LEN; j++, pfn++)
if (page_is_dumpable(pfn))
dd->valid_pages[i]++;
}
return TRUE;
err:
free(header);
if (sub_header)
free(sub_header);
if (sub_header_kdump)
free(sub_header_kdump);
if (dd->bitmap)
free(dd->bitmap);
if (dd->dumpable_bitmap)
free(dd->dumpable_bitmap);
if (dd->notes_buf)
free(dd->notes_buf);
if (dd->nt_prstatus_percpu)
free(dd->nt_prstatus_percpu);
dd->flags &= ~(DISKDUMP_LOCAL|KDUMP_CMPRS_LOCAL);
pc->flags2 &= ~ELF_NOTES;
return FALSE;
}
static ulong
pfn_to_pos(ulong pfn)
{
ulong desc_pos, j, valid;
ulong p1, p2;
if (KDUMP_SPLIT()) {
p1 = pfn - dd->sub_header_kdump->start_pfn_64;
p2 = round(p1, BITMAP_SECT_LEN)
+ dd->sub_header_kdump->start_pfn_64;
}
else {
p1 = pfn;
p2 = round(pfn, BITMAP_SECT_LEN);
}
valid = dd->valid_pages[p1 / BITMAP_SECT_LEN];
for (j = p2, desc_pos = valid; j <= pfn; j++)
if (page_is_dumpable(j))
desc_pos++;
return desc_pos;
}
/*
* Determine whether a file is a diskdump creation, and if TRUE,
* initialize the diskdump_data structure based upon the contents
* of the diskdump header data.
*/
int
is_diskdump(char *file)
{
int sz, i;
char *tmpstring;
if (!open_dump_file(file) || !read_dump_header(file))
return FALSE;
sz = dd->block_size * (DISKDUMP_CACHED_PAGES);
if ((dd->page_cache_buf = malloc(sz)) == NULL)
error(FATAL, "%s: cannot malloc compressed page_cache_buf\n",
DISKDUMP_VALID() ? "diskdump" : "compressed kdump");
for (i = 0; i < DISKDUMP_CACHED_PAGES; i++)
dd->page_cache_hdr[i].pg_bufptr =
&dd->page_cache_buf[i * dd->block_size];
if ((dd->compressed_page = (char *)malloc(dd->block_size)) == NULL)
error(FATAL, "%s: cannot malloc compressed page space\n",
DISKDUMP_VALID() ? "diskdump" : "compressed kdump");
if (CRASHDEBUG(1))
__diskdump_memory_dump(fp);
if (pc->flags2 & GET_OSRELEASE)
diskdump_get_osrelease();
#ifdef LZO
if (lzo_init() == LZO_E_OK)
dd->flags |= LZO_SUPPORTED;
#endif
#ifdef SNAPPY
dd->flags |= SNAPPY_SUPPORTED;
#endif
if ((pc->flags2 & GET_LOG) && KDUMP_CMPRS_VALID()) {
pc->dfd = dd->dfd;
pc->readmem = read_diskdump;
pc->flags |= DISKDUMP;
get_log_from_vmcoreinfo(file, vmcoreinfo_read_string);
}
/*
* We may need the _stext_SYMBOL from the vmcore_info to adjust for
* kaslr and we may not have gotten it elsewhere.
*/
if ((tmpstring = vmcoreinfo_read_string("SYMBOL(_stext)"))) {
kt->vmcoreinfo._stext_SYMBOL = htol(tmpstring,
RETURN_ON_ERROR, NULL);
free(tmpstring);
}
return TRUE;
}
/*
* Perform any post-dumpfile determination stuff here.
* At a minimum
*/
int
diskdump_init(char *unused, FILE *fptr)
{
if (!DISKDUMP_VALID() && !KDUMP_CMPRS_VALID())
return FALSE;
dd->ofp = fptr;
return TRUE;
}
/*
* Get the relocational offset from the sub header of kdump.
*/
int
diskdump_phys_base(unsigned long *phys_base)
{
if (KDUMP_CMPRS_VALID()) {
*phys_base = dd->sub_header_kdump->phys_base;
return TRUE;
}
return FALSE;
}
/*
* Check whether paddr is already cached.
*/
static int
page_is_cached(physaddr_t paddr)
{
int i;
struct page_cache_hdr *pgc;
dd->accesses++;
for (i = 0; i < DISKDUMP_CACHED_PAGES; i++) {
pgc = &dd->page_cache_hdr[i];
if (!DISKDUMP_VALID_PAGE(pgc->pg_flags))
continue;
if (pgc->pg_addr == paddr) {
pgc->pg_hit_count++;
dd->curbufptr = pgc->pg_bufptr;
dd->cached_reads++;
return TRUE;
}
}
return FALSE;
}
/*
* Translate physical address in paddr to PFN number. This means normally that
* we just shift paddr by some constant. Some architectures need special
* handling for this, however.
*/
static ulong
paddr_to_pfn(physaddr_t paddr)
{
#ifdef ARM
/*
* In ARM, PFN 0 means first page in kernel direct-mapped view.
* This is also first page in mem_map as well.
*/
return (paddr - machdep->machspec->phys_base) >> dd->block_shift;
#else
return paddr >> dd->block_shift;
#endif
}
/*
* Cache the page's data.
*
* If an empty page cache location is available, take it. Otherwise, evict
* the entry indexed by evict_index, and then bump evict index. The hit_count
* is only gathered for dump_diskdump_environment().
*
* If the page is compressed, uncompress it into the selected page cache entry.
* If the page is raw, just copy it into the selected page cache entry.
* If all works OK, update diskdump->curbufptr to point to the page's
* uncompressed data.
*/
static int
cache_page(physaddr_t paddr)
{
int i, ret;
int found;
ulong pfn;
ulong desc_pos;
off_t seek_offset;
page_desc_t pd;
const int block_size = dd->block_size;
const off_t failed = (off_t)-1;
ulong retlen;
for (i = found = 0; i < DISKDUMP_CACHED_PAGES; i++) {
if (DISKDUMP_VALID_PAGE(dd->page_cache_hdr[i].pg_flags))
continue;
found = TRUE;
break;
}
if (!found) {
i = dd->evict_index;
dd->page_cache_hdr[i].pg_hit_count = 0;
dd->evict_index =
(dd->evict_index+1) % DISKDUMP_CACHED_PAGES;
dd->evictions++;
}
dd->page_cache_hdr[i].pg_flags = 0;
dd->page_cache_hdr[i].pg_addr = paddr;
dd->page_cache_hdr[i].pg_hit_count++;
/* find page descriptor */
pfn = paddr_to_pfn(paddr);
desc_pos = pfn_to_pos(pfn);
seek_offset = dd->data_offset
+ (off_t)(desc_pos - 1)*sizeof(page_desc_t);
/* read page descriptor */
if (FLAT_FORMAT()) {
if (!read_flattened_format(dd->dfd, seek_offset, &pd, sizeof(pd)))
return READ_ERROR;
} else {
if (lseek(dd->dfd, seek_offset, SEEK_SET) == failed)
return SEEK_ERROR;
if (read(dd->dfd, &pd, sizeof(pd)) != sizeof(pd))
return READ_ERROR;
}
/* sanity check */
if (pd.size > block_size)
return READ_ERROR;