----- "Daisuke HATAYAMA" <d.hatayama@xxxxxxxxxxxxxx> wrote:
> Hi Dave.
>
> Well, I have still a question: Does kdump-compressed format contain
> register values for CPUs?
>
> I've looked into part of makedumpfile reading ELF but found out that
> yet. It appears to me that makedumpfile ignores all note info except
> for vmcoreinfo's location.
That's correct, there are no per-cpu register values. From the crash
utility's perspective, all it gets from the makedumpfile-generated
compressed dumpfile is the diskdump_header and kdump_sub_header:
struct disk_dump_header {
char signature[SIG_LEN]; /* = "DISKDUMP" */
int header_version; /* Dump header version */
struct new_utsname utsname; /* copy of system_utsname */
struct timeval timestamp; /* Time stamp */
unsigned int status; /* Above flags */
int block_size; /* Size of a block in byte */
int sub_hdr_size; /* Size of arch dependent
header in blocks */
unsigned int bitmap_blocks; /* Size of Memory bitmap in
block */
unsigned int max_mapnr; /* = max_mapnr */
unsigned int total_ram_blocks;/* Number of blocks should be
written */
unsigned int device_blocks; /* Number of total blocks in
* the dump device */
unsigned int written_blocks; /* Number of written blocks */
unsigned int current_cpu; /* CPU# which handles dump */
int nr_cpus; /* Number of CPUs */
struct task_struct *tasks[0];
};
struct kdump_sub_header {
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 */
};
Dave
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