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target-i386: Add API to get note's size

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We should know where the note and memory is stored before writing
them to vmcore. If we know this, we can avoid using lseek() when
creating vmcore.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Wen Congyang 2012-05-07 12:09:36 +08:00 committed by Luiz Capitulino
parent 25ae9c1d8b
commit 0038ffb096
2 changed files with 39 additions and 0 deletions
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6
cpu-all.h
View File

@ -553,6 +553,7 @@ int cpu_write_elf64_qemunote(write_core_dump_function f, CPUArchState *env,
int cpu_write_elf32_qemunote(write_core_dump_function f, CPUArchState *env,
void *opaque);
int cpu_get_dump_info(ArchDumpInfo *info);
size_t cpu_get_note_size(int class, int machine, int nr_cpus);
#else
static inline int cpu_write_elf64_note(write_core_dump_function f,
CPUArchState *env, int cpuid,
@ -586,6 +587,11 @@ static inline int cpu_get_dump_info(ArchDumpInfo *info)
{
return -1;
}
static inline int cpu_get_note_size(int class, int machine, int nr_cpus)
{
return -1;
}
#endif
#endif /* CPU_ALL_H */

33
target-i386/arch_dump.c
View File

@ -414,3 +414,36 @@ int cpu_get_dump_info(ArchDumpInfo *info)
return 0;
}
size_t cpu_get_note_size(int class, int machine, int nr_cpus)
{
int name_size = 5; /* "CORE" or "QEMU" */
size_t elf_note_size = 0;
size_t qemu_note_size = 0;
int elf_desc_size = 0;
int qemu_desc_size = 0;
int note_head_size;
if (class == ELFCLASS32) {
note_head_size = sizeof(Elf32_Nhdr);
} else {
note_head_size = sizeof(Elf64_Nhdr);
}
if (machine == EM_386) {
elf_desc_size = sizeof(x86_elf_prstatus);
}
#ifdef TARGET_X86_64
else {
elf_desc_size = sizeof(x86_64_elf_prstatus);
}
#endif
qemu_desc_size = sizeof(QEMUCPUState);
elf_note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
(elf_desc_size + 3) / 4) * 4;
qemu_note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
(qemu_desc_size + 3) / 4) * 4;
return (elf_note_size + qemu_note_size) * nr_cpus;
}