diff options
Diffstat (limited to 'kexec/crashdump.c')
| -rw-r--r-- | kexec/crashdump.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/kexec/crashdump.c b/kexec/crashdump.c new file mode 100644 index 0000000..0b363c5 --- /dev/null +++ b/kexec/crashdump.c @@ -0,0 +1,159 @@ +/* + * 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, "%llx", &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, "%llu", &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 = %llx, size = %llu\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, "%llx %llx", &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); +} |