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/*
* crashdump.c: Architecture independent code for crashdump support.
*
* Created by: Vivek Goyal (vgoyal@in.ibm.com)
* Copyright (C) IBM Corporation, 2005. All rights reserved
*
* 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 (version 2 of the License).
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <linux/limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <elf.h>
#include "kexec.h"
#include "crashdump.h"
#include "kexec-syscall.h"
/* include "crashdump-elf.c" twice to create two functions from one */
#define ELF_WIDTH 64
#define FUNC crash_create_elf64_headers
#define EHDR Elf64_Ehdr
#define PHDR Elf64_Phdr
#include "crashdump-elf.c"
#undef ELF_WIDTH
#undef PHDR
#undef EHDR
#undef FUNC
#define ELF_WIDTH 32
#define FUNC crash_create_elf32_headers
#define EHDR Elf32_Ehdr
#define PHDR Elf32_Phdr
#include "crashdump-elf.c"
#undef ELF_WIDTH
#undef PHDR
#undef EHDR
#undef FUNC
unsigned long crash_architecture(struct crash_elf_info *elf_info)
{
if (xen_present())
return xen_architecture(elf_info);
else
return elf_info->machine;
}
/* Returns the physical address of start of crash notes buffer for a cpu. */
int get_crash_notes_per_cpu(int cpu, uint64_t *addr, uint64_t *len)
{
char crash_notes[PATH_MAX];
char crash_notes_size[PATH_MAX];
char line[MAX_LINE];
FILE *fp;
struct stat cpu_stat;
int count;
unsigned long long temp;
int fopen_errno;
int stat_errno;
*addr = 0;
*len = 0;
sprintf(crash_notes, "/sys/devices/system/cpu/cpu%d/crash_notes", cpu);
fp = fopen(crash_notes, "r");
if (!fp) {
fopen_errno = errno;
if (fopen_errno != ENOENT)
die("Could not open \"%s\": %s\n", crash_notes,
strerror(fopen_errno));
if (!stat("/sys/devices", &cpu_stat)) {
stat_errno = errno;
if (stat_errno == ENOENT)
die("\"/sys/devices\" does not exist. "
"Sysfs does not seem to be mounted. "
"Try mounting sysfs.\n");
die("Could not open \"/sys/devices\": %s\n",
strerror(stat_errno));
}
/* CPU is not physically present.*/
return -1;
}
if (!fgets(line, sizeof(line), fp))
die("Cannot parse %s: %s\n", crash_notes, strerror(errno));
count = sscanf(line, "%Lx", &temp);
if (count != 1)
die("Cannot parse %s: %s\n", crash_notes, strerror(errno));
*addr = (uint64_t) temp;
fclose(fp);
*len = MAX_NOTE_BYTES;
sprintf(crash_notes_size,
"/sys/devices/system/cpu/cpu%d/crash_notes_size", cpu);
fp = fopen(crash_notes_size, "r");
if (fp) {
if (!fgets(line, sizeof(line), fp))
die("Cannot parse %s: %s\n",
crash_notes_size, strerror(errno));
count = sscanf(line, "%Lu", &temp);
if (count != 1)
die("Cannot parse %s: %s\n",
crash_notes_size, strerror(errno));
*len = (uint64_t) temp;
fclose(fp);
}
dbgprintf("%s: crash_notes addr = %Lx, size = %Lu\n", __FUNCTION__,
(unsigned long long)*addr, (unsigned long long)*len);
return 0;
}
static int get_vmcoreinfo(const char *kdump_info, uint64_t *addr, uint64_t *len)
{
char line[MAX_LINE];
int count;
FILE *fp;
unsigned long long temp, temp2;
*addr = 0;
*len = 0;
if (!(fp = fopen(kdump_info, "r")))
return -1;
if (!fgets(line, sizeof(line), fp))
die("Cannot parse %s: %s\n", kdump_info, strerror(errno));
count = sscanf(line, "%Lx %Lx", &temp, &temp2);
if (count != 2)
die("Cannot parse %s: %s\n", kdump_info, strerror(errno));
*addr = (uint64_t) temp;
*len = (uint64_t) temp2;
fclose(fp);
return 0;
}
/* Returns the physical address of start of crash notes buffer for a kernel. */
int get_kernel_vmcoreinfo(uint64_t *addr, uint64_t *len)
{
return get_vmcoreinfo("/sys/kernel/vmcoreinfo", addr, len);
}
int get_xen_vmcoreinfo(uint64_t *addr, uint64_t *len)
{
return get_vmcoreinfo("/sys/hypervisor/vmcoreinfo", addr, len);
}
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