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elf_info.c
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/*
* elf_info.c
*
* Copyright (C) 2011 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 <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <gelf.h>
#include <libelf.h>
#include "common.h"
#include "print_info.h"
#include "elf_info.h"
#include "makedumpfile.h"
#define ELF32 (1)
#define ELF64 (2)
#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
#define VMCOREINFO_NOTE_NAME_BYTES (sizeof(VMCOREINFO_NOTE_NAME))
#define VMCOREINFO_XEN_NOTE_NAME "VMCOREINFO_XEN"
#define VMCOREINFO_XEN_NOTE_NAME_BYTES (sizeof(VMCOREINFO_XEN_NOTE_NAME))
#define XEN_ELFNOTE_CRASH_INFO (0x1000001)
struct pt_load_segment {
off_t file_offset;
off_t file_size;
unsigned long long phys_start;
unsigned long long phys_end;
unsigned long long virt_start;
unsigned long long virt_end;
};
static int nr_cpus; /* number of cpu */
static off_t max_file_offset;
/*
* File information about /proc/vmcore:
*/
static int fd_memory;
static char *name_memory;
static int flags_memory;
#define MEMORY_ELF64 (1 << 0)
#define MEMORY_XEN (1 << 1)
/*
* PT_LOAD information about /proc/vmcore:
*/
static unsigned int num_pt_loads;
static struct pt_load_segment *pt_loads;
static off_t offset_pt_load_memory;
/*
* PT_NOTE information about /proc/vmcore:
*/
static off_t offset_pt_note_memory;
static unsigned long size_pt_note_memory;
/*
* vmcoreinfo in /proc/vmcore:
*/
static off_t offset_vmcoreinfo;
static unsigned long size_vmcoreinfo;
static off_t offset_vmcoreinfo_xen;
static unsigned long size_vmcoreinfo_xen;
/*
* erased information in /proc/vmcore:
*/
static off_t offset_eraseinfo;
static unsigned long size_eraseinfo;
/*
* Xen information:
*/
static off_t offset_xen_crash_info;
static unsigned long size_xen_crash_info;
/*
* Internal functions.
*/
static int
check_elf_format(int fd, char *filename, int *phnum, unsigned int *num_load)
{
int i;
Elf64_Ehdr ehdr64;
Elf64_Phdr load64;
Elf32_Ehdr ehdr32;
Elf32_Phdr load32;
if (lseek(fd, 0, SEEK_SET) < 0) {
ERRMSG("Can't seek %s. %s\n", filename, strerror(errno));
return FALSE;
}
if (read(fd, &ehdr64, sizeof(Elf64_Ehdr)) != sizeof(Elf64_Ehdr)) {
ERRMSG("Can't read %s. %s\n", filename, strerror(errno));
return FALSE;
}
if (lseek(fd, 0, SEEK_SET) < 0) {
ERRMSG("Can't seek %s. %s\n", filename, strerror(errno));
return FALSE;
}
if (read(fd, &ehdr32, sizeof(Elf32_Ehdr)) != sizeof(Elf32_Ehdr)) {
ERRMSG("Can't read %s. %s\n", filename, strerror(errno));
return FALSE;
}
(*num_load) = 0;
if ((ehdr64.e_ident[EI_CLASS] == ELFCLASS64)
&& (ehdr32.e_ident[EI_CLASS] != ELFCLASS32)) {
if (!get_elf64_phnum(fd, filename, &ehdr64, phnum)) {
ERRMSG("Can't get phnum.\n");
return FALSE;
}
for (i = 0; i < (*phnum); i++) {
if (!get_elf64_phdr(fd, filename, i, &load64)) {
ERRMSG("Can't find Phdr %d.\n", i);
return FALSE;
}
if (load64.p_type == PT_LOAD)
(*num_load)++;
}
return ELF64;
} else if ((ehdr64.e_ident[EI_CLASS] != ELFCLASS64)
&& (ehdr32.e_ident[EI_CLASS] == ELFCLASS32)) {
(*phnum) = ehdr32.e_phnum;
for (i = 0; i < ehdr32.e_phnum; i++) {
if (!get_elf32_phdr(fd, filename, i, &load32)) {
ERRMSG("Can't find Phdr %d.\n", i);
return FALSE;
}
if (load32.p_type == PT_LOAD)
(*num_load)++;
}
return ELF32;
}
ERRMSG("Can't get valid ehdr.\n");
return FALSE;
}
static int
dump_Elf_load(Elf64_Phdr *prog, int num_load)
{
struct pt_load_segment *pls;
if (prog->p_type != PT_LOAD) {
ERRMSG("Not PT_LOAD.\n");
return FALSE;
}
pls = &pt_loads[num_load];
pls->phys_start = prog->p_paddr;
pls->phys_end = pls->phys_start + prog->p_memsz;
pls->virt_start = prog->p_vaddr;
pls->virt_end = pls->virt_start + prog->p_memsz;
pls->file_offset = prog->p_offset;
pls->file_size = prog->p_filesz;
if (num_load == 0)
DEBUG_MSG("%8s %16s %16s %16s %16s\n", "",
"phys_start", "phys_end", "virt_start", "virt_end");
DEBUG_MSG("LOAD[%2d] %16llx %16llx %16llx %16llx\n", num_load,
pls->phys_start, pls->phys_end, pls->virt_start, pls->virt_end);
return TRUE;
}
static off_t
offset_next_note(void *note)
{
off_t offset;
Elf64_Nhdr *note64;
Elf32_Nhdr *note32;
/*
* Both name and desc in ELF Note elements are padded to
* 4 byte boundary.
*/
if (is_elf64_memory()) {
note64 = (Elf64_Nhdr *)note;
offset = sizeof(Elf64_Nhdr)
+ roundup(note64->n_namesz, 4)
+ roundup(note64->n_descsz, 4);
} else {
note32 = (Elf32_Nhdr *)note;
offset = sizeof(Elf32_Nhdr)
+ roundup(note32->n_namesz, 4)
+ roundup(note32->n_descsz, 4);
}
return offset;
}
static int
note_type(void *note)
{
int type;
Elf64_Nhdr *note64;
Elf32_Nhdr *note32;
if (is_elf64_memory()) {
note64 = (Elf64_Nhdr *)note;
type = note64->n_type;
} else {
note32 = (Elf32_Nhdr *)note;
type = note32->n_type;
}
return type;
}
static int
note_namesz(void *note)
{
int size;
Elf64_Nhdr *note64;
Elf32_Nhdr *note32;
if (is_elf64_memory()) {
note64 = (Elf64_Nhdr *)note;
size = note64->n_namesz;
} else {
note32 = (Elf32_Nhdr *)note;
size = note32->n_namesz;
}
return size;
}
static int
note_descsz(void *note)
{
int size;
Elf64_Nhdr *note64;
Elf32_Nhdr *note32;
if (is_elf64_memory()) {
note64 = (Elf64_Nhdr *)note;
size = note64->n_descsz;
} else {
note32 = (Elf32_Nhdr *)note;
size = note32->n_descsz;
}
return size;
}
static off_t
offset_note_desc(void *note)
{
off_t offset;
Elf64_Nhdr *note64;
Elf32_Nhdr *note32;
if (is_elf64_memory()) {
note64 = (Elf64_Nhdr *)note;
offset = sizeof(Elf64_Nhdr) + roundup(note64->n_namesz, 4);
} else {
note32 = (Elf32_Nhdr *)note;
offset = sizeof(Elf32_Nhdr) + roundup(note32->n_namesz, 4);
}
return offset;
}
static int
get_pt_note_info(void)
{
int n_type, size_name, size_desc;
off_t offset, offset_desc;
char buf[VMCOREINFO_XEN_NOTE_NAME_BYTES];
char note[MAX_SIZE_NHDR];
nr_cpus = 0;
offset = offset_pt_note_memory;
while (offset < offset_pt_note_memory + size_pt_note_memory) {
if (lseek(fd_memory, offset, SEEK_SET) < 0) {
ERRMSG("Can't seek the dump memory(%s). %s\n",
name_memory, strerror(errno));
return FALSE;
}
if (read(fd_memory, note, sizeof(note)) != sizeof(note)) {
ERRMSG("Can't read the dump memory(%s). %s\n",
name_memory, strerror(errno));
return FALSE;
}
n_type = note_type(note);
size_name = note_namesz(note);
size_desc = note_descsz(note);
offset_desc = offset + offset_note_desc(note);
if (!size_name || size_name > sizeof(buf))
goto next_note;
if (read(fd_memory, &buf, sizeof(buf)) != sizeof(buf)) {
ERRMSG("Can't read the dump memory(%s). %s\n",
name_memory, strerror(errno));
return FALSE;
}
if (!strncmp(KEXEC_CORE_NOTE_NAME, buf,
KEXEC_CORE_NOTE_NAME_BYTES)) {
if (n_type == NT_PRSTATUS) {
nr_cpus++;
}
} else if (!strncmp(VMCOREINFO_NOTE_NAME, buf,
VMCOREINFO_NOTE_NAME_BYTES)) {
if (n_type == 0) {
set_vmcoreinfo(offset_desc, size_desc);
}
/*
* Check whether /proc/vmcore contains vmcoreinfo,
* and get both the offset and the size.
*/
} else if (!strncmp(VMCOREINFO_XEN_NOTE_NAME, buf,
VMCOREINFO_XEN_NOTE_NAME_BYTES)) {
if (n_type == 0) {
offset_vmcoreinfo_xen = offset_desc;
size_vmcoreinfo_xen = size_desc;
}
/*
* Check whether /proc/vmcore contains xen's note.
*/
} else if (!strncmp("Xen", buf, 4)) {
if (n_type == XEN_ELFNOTE_CRASH_INFO) {
flags_memory |= MEMORY_XEN;
offset_xen_crash_info = offset_desc;
size_xen_crash_info = size_desc;
}
/*
* Check whether a source dumpfile contains eraseinfo.
* /proc/vmcore does not contain eraseinfo, because eraseinfo
* is added only by makedumpfile and makedumpfile does not
* create /proc/vmcore.
*/
} else if (!strncmp(ERASEINFO_NOTE_NAME, buf,
ERASEINFO_NOTE_NAME_BYTES)) {
if (n_type == 0) {
set_eraseinfo(offset_desc, size_desc);
}
}
next_note:
offset += offset_next_note(note);
}
if (is_xen_memory())
DEBUG_MSG("Xen kdump\n");
else
DEBUG_MSG("Linux kdump\n");
return TRUE;
}
#define UNINITIALIZED ((ulong)(-1))
int set_kcore_vmcoreinfo(uint64_t vmcoreinfo_addr, uint64_t vmcoreinfo_len)
{
int i;
ulong kvaddr;
off_t offset;
char note[MAX_SIZE_NHDR];
int size_desc;
off_t offset_desc;
offset = UNINITIALIZED;
kvaddr = paddr_to_vaddr(vmcoreinfo_addr);
for (i = 0; i < num_pt_loads; ++i) {
struct pt_load_segment *p = &pt_loads[i];
if ((kvaddr >= p->virt_start) && (kvaddr < p->virt_end)) {
offset = (off_t)(kvaddr - p->virt_start) +
(off_t)p->file_offset;
break;
}
}
if (offset == UNINITIALIZED) {
ERRMSG("Can't get the offset of VMCOREINFO(%s). %s\n",
name_memory, strerror(errno));
return FALSE;
}
if (lseek(fd_memory, offset, SEEK_SET) != offset) {
ERRMSG("Can't seek the dump memory(%s). %s\n",
name_memory, strerror(errno));
return FALSE;
}
if (read(fd_memory, note, MAX_SIZE_NHDR) != MAX_SIZE_NHDR) {
ERRMSG("Can't read the dump memory(%s). %s\n",
name_memory, strerror(errno));
return FALSE;
}
size_desc = note_descsz(note);
offset_desc = offset + offset_note_desc(note);
set_vmcoreinfo(offset_desc, size_desc);
return TRUE;
}
/*
* External functions.
*/
int
get_elf64_phdr(int fd, char *filename, int index, Elf64_Phdr *phdr)
{
off_t offset;
offset = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * index;
if (lseek(fd, offset, SEEK_SET) < 0) {
ERRMSG("Can't seek %s. %s\n", filename, strerror(errno));
return FALSE;
}
if (read(fd, phdr, sizeof(Elf64_Phdr)) != sizeof(Elf64_Phdr)) {
ERRMSG("Can't read %s. %s\n", filename, strerror(errno));
return FALSE;
}
return TRUE;
}
int
get_elf32_phdr(int fd, char *filename, int index, Elf32_Phdr *phdr)
{
off_t offset;
offset = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * index;
if (lseek(fd, offset, SEEK_SET) < 0) {
ERRMSG("Can't seek %s. %s\n", filename, strerror(errno));
return FALSE;
}
if (read(fd, phdr, sizeof(Elf32_Phdr)) != sizeof(Elf32_Phdr)) {
ERRMSG("Can't read %s. %s\n", filename, strerror(errno));
return FALSE;
}
return TRUE;
}
/*
* Convert Physical Address to File Offset.
* If this function returns 0x0, File Offset isn't found.
* The File Offset 0x0 is in the ELF header.
* It is not in the memory image.
*/
off_t
paddr_to_offset(unsigned long long paddr)
{
int i;
off_t offset;
struct pt_load_segment *pls;
for (i = offset = 0; i < num_pt_loads; i++) {
pls = &pt_loads[i];
if ((paddr >= pls->phys_start)
&& (paddr < pls->phys_start + pls->file_size)) {
offset = (off_t)(paddr - pls->phys_start) +
pls->file_offset;
break;
}
}
return offset;
}
/*
* Same as paddr_to_offset() but makes sure that the specified offset (hint)
* in the segment.
*/
off_t
paddr_to_offset2(unsigned long long paddr, off_t hint)
{
int i;
off_t offset;
struct pt_load_segment *pls;
for (i = offset = 0; i < num_pt_loads; i++) {
pls = &pt_loads[i];
if ((paddr >= pls->phys_start)
&& (paddr < pls->phys_start + pls->file_size)
&& (hint >= pls->file_offset)
&& (hint < pls->file_offset + pls->file_size)) {
offset = (off_t)(paddr - pls->phys_start) +
pls->file_offset;
break;
}
}
return offset;
}
unsigned long long
page_head_to_phys_start(unsigned long long head_paddr)
{
int i;
struct pt_load_segment *pls;
for (i = 0; i < num_pt_loads; i++) {
pls = &pt_loads[i];
if ((pls->phys_start <= head_paddr + info->page_size)
&& (head_paddr < pls->phys_end)) {
return (pls->phys_start > head_paddr) ?
pls->phys_start : head_paddr;
}
}
return 0;
}
unsigned long long
page_head_to_phys_end(unsigned long long head_paddr)
{
int i;
struct pt_load_segment *pls;
for (i = 0; i < num_pt_loads; i++) {
pls = &pt_loads[i];
if ((pls->phys_start <= head_paddr + info->page_size)
&& (head_paddr < pls->phys_end)) {
return (pls->phys_end < head_paddr + info->page_size) ?
pls->phys_end : head_paddr + info->page_size;
}
}
return 0;
}
/*
* Calculate a start File Offset of PT_LOAD from a File Offset
* of a page. If this function returns 0x0, the input page is
* not in the memory image.
*/
off_t
offset_to_pt_load_start(off_t offset)
{
int i;
off_t pt_load_start;
struct pt_load_segment *pls;
for (i = pt_load_start = 0; i < num_pt_loads; i++) {
pls = &pt_loads[i];
if ((offset >= pls->file_offset)
&& (offset < pls->file_offset +
(pls->phys_end - pls->phys_start))) {
pt_load_start = pls->file_offset;
break;
}
}
return pt_load_start;
}
/*
* Calculate a end File Offset of PT_LOAD from a File Offset
* of a page. If this function returns 0x0, the input page is
* not in the memory image.
*/
off_t
offset_to_pt_load_end(off_t offset)
{
int i;
off_t pt_load_end;
struct pt_load_segment *pls;
for (i = pt_load_end = 0; i < num_pt_loads; i++) {
pls = &pt_loads[i];
if ((offset >= pls->file_offset)
&& (offset < pls->file_offset +
(pls->phys_end - pls->phys_start))) {
pt_load_end = (off_t)(pls->file_offset +
(pls->phys_end - pls->phys_start));
break;
}
}
return pt_load_end;
}
/*
* Judge whether the page is fractional or not.
*/
int
page_is_fractional(off_t page_offset)
{
if (page_offset % info->page_size != 0)
return TRUE;
if (offset_to_pt_load_end(page_offset) - page_offset
< info->page_size)
return TRUE;
return FALSE;
}
unsigned long long
vaddr_to_paddr_general(unsigned long long vaddr)
{
int i;
unsigned long long paddr = NOT_PADDR;
struct pt_load_segment *pls;
if (pt_loads == NULL)
return NOT_PADDR;
for (i = 0; i < num_pt_loads; i++) {
pls = &pt_loads[i];
if ((vaddr >= pls->virt_start)
&& (vaddr < pls->virt_end)) {
paddr = (off_t)(vaddr - pls->virt_start) +
pls->phys_start;
break;
}
}
return paddr;
}
/*
* This function is slow because it doesn't use the memory.
* It is useful at few calls like get_str_osrelease_from_vmlinux().
*/
off_t
vaddr_to_offset_slow(int fd, char *filename, unsigned long long vaddr)
{
off_t offset = 0;
int i, phnum, flag_elf64, elf_format;
unsigned int num_load;
Elf64_Phdr load64;
Elf32_Phdr load32;
elf_format = check_elf_format(fd, filename, &phnum, &num_load);
if (elf_format == ELF64)
flag_elf64 = TRUE;
else if (elf_format == ELF32)
flag_elf64 = FALSE;
else
return 0;
for (i = 0; i < phnum; i++) {
if (flag_elf64) { /* ELF64 */
if (!get_elf64_phdr(fd, filename, i, &load64)) {
ERRMSG("Can't find Phdr %d.\n", i);
return 0;
}
if (load64.p_type != PT_LOAD)
continue;
if ((vaddr < load64.p_vaddr)
|| (load64.p_vaddr + load64.p_filesz <= vaddr))
continue;
offset = load64.p_offset + (vaddr - load64.p_vaddr);
break;
} else { /* ELF32 */
if (!get_elf32_phdr(fd, filename, i, &load32)) {
ERRMSG("Can't find Phdr %d.\n", i);
return 0;
}
if (load32.p_type != PT_LOAD)
continue;
if ((vaddr < load32.p_vaddr)
|| (load32.p_vaddr + load32.p_filesz <= vaddr))
continue;
offset = load32.p_offset + (vaddr - load32.p_vaddr);
break;
}
}
return offset;
}
unsigned long long
get_max_paddr(void)
{
int i;
unsigned long long max_paddr = 0;
struct pt_load_segment *pls;
for (i = 0; i < num_pt_loads; i++) {
pls = &pt_loads[i];
if (max_paddr < pls->phys_end)
max_paddr = pls->phys_end;
}
return max_paddr;
}
/*
* Find the LOAD segment which is closest to the requested
* physical address within a given distance.
* If there is no such segment, return a negative number.
*/
int
closest_pt_load(unsigned long long paddr, unsigned long distance)
{
int i, bestidx;
struct pt_load_segment *pls;
unsigned long bestdist;
bestdist = distance;
bestidx = -1;
for (i = 0; i < num_pt_loads; ++i) {
pls = &pt_loads[i];
if (paddr >= pls->phys_end)
continue;
if (paddr >= pls->phys_start)
return i; /* Exact match */
if (bestdist > pls->phys_start - paddr) {
bestdist = pls->phys_start - paddr;
bestidx = i;
}
}
return bestidx;
}
int
get_elf64_ehdr(int fd, char *filename, Elf64_Ehdr *ehdr)
{
if (lseek(fd, 0, SEEK_SET) < 0) {
ERRMSG("Can't seek %s. %s\n", filename, strerror(errno));
return FALSE;
}
if (read(fd, ehdr, sizeof(Elf64_Ehdr)) != sizeof(Elf64_Ehdr)) {
ERRMSG("Can't read %s. %s\n", filename, strerror(errno));
return FALSE;
}
if (ehdr->e_ident[EI_CLASS] != ELFCLASS64) {
ERRMSG("Can't get valid e_ident.\n");
return FALSE;
}
return TRUE;
}
int
get_elf32_ehdr(int fd, char *filename, Elf32_Ehdr *ehdr)
{
if (lseek(fd, 0, SEEK_SET) < 0) {
ERRMSG("Can't seek %s. %s\n", filename, strerror(errno));
return FALSE;
}
if (read(fd, ehdr, sizeof(Elf32_Ehdr)) != sizeof(Elf32_Ehdr)) {
ERRMSG("Can't read %s. %s\n", filename, strerror(errno));
return FALSE;
}
if (ehdr->e_ident[EI_CLASS] != ELFCLASS32) {
ERRMSG("Can't get valid e_ident.\n");
return FALSE;
}
return TRUE;
}
static int exclude_segment(struct pt_load_segment **pt_loads,
unsigned int *num_pt_loads, uint64_t start, uint64_t end)
{
int i, j, tidx = -1;
unsigned long long vstart, vend, kvstart, kvend;
struct pt_load_segment temp_seg = {0};
unsigned long size;
kvstart = paddr_to_vaddr(start);
kvend = paddr_to_vaddr(end);
for (i = 0; i < (*num_pt_loads); i++) {
vstart = (*pt_loads)[i].virt_start;
vend = (*pt_loads)[i].virt_end;
if (kvstart < vend && kvend > vstart) {
if (kvstart != vstart && kvend != vend) {
/* Split load segment */
temp_seg.phys_start = end;
temp_seg.phys_end = (*pt_loads)[i].phys_end;
temp_seg.virt_start = kvend;
temp_seg.virt_end = vend;
temp_seg.file_offset = (*pt_loads)[i].file_offset
+ temp_seg.virt_start - (*pt_loads)[i].virt_start;
temp_seg.file_size = temp_seg.phys_end
- temp_seg.phys_start;
(*pt_loads)[i].virt_end = kvstart;
(*pt_loads)[i].phys_end = start;
(*pt_loads)[i].file_size -= temp_seg.file_size;
tidx = i+1;
} else if (kvstart != vstart) {
(*pt_loads)[i].phys_end = start;
(*pt_loads)[i].virt_end = kvstart;
} else {
(*pt_loads)[i].phys_start = end;
(*pt_loads)[i].virt_start = kvend;
}
(*pt_loads)[i].file_size -= (end -start);
}
}
/* Insert split load segment, if any. */
if (tidx >= 0) {
size = (*num_pt_loads + 1) * sizeof((*pt_loads)[0]);
(*pt_loads) = realloc((*pt_loads), size);
if (!(*pt_loads)) {
ERRMSG("Cannot realloc %ld bytes: %s\n",
size + 0UL, strerror(errno));
exit(1);
}
for (j = (*num_pt_loads - 1); j >= tidx; j--)
(*pt_loads)[j+1] = (*pt_loads)[j];
(*pt_loads)[tidx] = temp_seg;
(*num_pt_loads)++;
}
return 0;
}
int get_kcore_dump_loads(void)
{
struct pt_load_segment *pls;
int i, j, loads = 0;
for (i = 0; i < num_pt_loads; ++i) {
struct pt_load_segment *p = &pt_loads[i];
if (p->phys_start == NOT_PADDR
|| !is_phys_addr(p->virt_start))
continue;
loads++;
}
if (!loads) {
ERRMSG("Can't get the correct number of PT_LOAD. %s\n",
strerror(errno));
return FALSE;
}
pls = calloc(sizeof(struct pt_load_segment), loads);
if (pls == NULL) {
ERRMSG("Can't allocate memory for the PT_LOAD. %s\n",
strerror(errno));
return FALSE;
}
for (i = 0, j = 0; i < num_pt_loads; ++i) {
struct pt_load_segment *p = &pt_loads[i];
if (p->phys_start == NOT_PADDR
|| !is_phys_addr(p->virt_start))
continue;
if (j >= loads) {
free(pls);
return FALSE;
}
if (j == 0) {
offset_pt_load_memory = p->file_offset;
if (offset_pt_load_memory == 0) {
ERRMSG("Can't get the offset of page data.\n");
free(pls);
return FALSE;
}
}
pls[j] = *p;
j++;
}
free(pt_loads);
pt_loads = pls;
num_pt_loads = loads;
for (i = 0; i < crash_reserved_mem_nr; i++) {
exclude_segment(&pt_loads, &num_pt_loads,
crash_reserved_mem[i].start, crash_reserved_mem[i].end + 1);
}
max_file_offset = 0;
for (i = 0; i < num_pt_loads; ++i) {
struct pt_load_segment *p = &pt_loads[i];
max_file_offset = MAX(max_file_offset,
p->file_offset + p->phys_end - p->phys_start);
}
DEBUG_MSG("%8s %16s %16s %16s %16s\n", "",
"phys_start", "phys_end", "virt_start", "virt_end");
for (i = 0; i < num_pt_loads; ++i) {
struct pt_load_segment *p = &pt_loads[i];
DEBUG_MSG("LOAD[%2d] %16llx %16llx %16llx %16llx\n", i,
p->phys_start, p->phys_end, p->virt_start, p->virt_end);
}
return TRUE;
}
/*
* Get ELF information about /proc/vmcore.
*/
int
get_elf_info(int fd, char *filename)
{
int i, j, phnum, elf_format;
Elf64_Phdr phdr;
/*
* Check ELF64 or ELF32.
*/
elf_format = check_elf_format(fd, filename, &phnum, &num_pt_loads);
if (elf_format == ELF64)
flags_memory |= MEMORY_ELF64;
else if (elf_format != ELF32)
return FALSE;
if (!num_pt_loads) {
ERRMSG("Can't get the number of PT_LOAD.\n");
return FALSE;
}
/*
* The below file information will be used as /proc/vmcore.
*/
fd_memory = fd;
name_memory = filename;
pt_loads = calloc(sizeof(struct pt_load_segment), num_pt_loads);
if (pt_loads == NULL) {
ERRMSG("Can't allocate memory for the PT_LOAD. %s\n",
strerror(errno));
return FALSE;
}
for (i = 0, j = 0; i < phnum; i++) {
if (!get_phdr_memory(i, &phdr))
return FALSE;
if (phdr.p_type == PT_NOTE) {
set_pt_note(phdr.p_offset, phdr.p_filesz);
}
if (phdr.p_type != PT_LOAD)
continue;
if (j == 0) {
offset_pt_load_memory = phdr.p_offset;
if (offset_pt_load_memory == 0) {
ERRMSG("Can't get the offset of page data.\n");
return FALSE;
}
}
if (j >= num_pt_loads)
return FALSE;
if(!dump_Elf_load(&phdr, j))
return FALSE;
j++;
}
max_file_offset = 0;
for (i = 0; i < num_pt_loads; ++i) {
struct pt_load_segment *p = &pt_loads[i];
max_file_offset = MAX(max_file_offset,
p->file_offset + p->phys_end - p->phys_start);
}
if (!has_pt_note()) {
ERRMSG("Can't find PT_NOTE Phdr.\n");
return FALSE;
}
if (!get_pt_note_info()) {
ERRMSG("Can't get PT_NOTE information.\n");
return FALSE;
}
return TRUE;
}
void
free_elf_info(void)
{
free(pt_loads);
pt_loads = NULL;
}
int
is_elf64_memory(void)
{
return (flags_memory & MEMORY_ELF64);
}
int
is_xen_memory(void)
{
return (flags_memory & MEMORY_XEN);
}
int
get_elf64_phnum(int fd, char *filename, Elf64_Ehdr *ehdr, int *phnum)
{
Elf64_Shdr shdr;
/*
* Extended Numbering support
* See include/uapi/linux/elf.h and elf(5) for more information.
*/