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

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;
}