diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2011-01-21 21:48:08 +0100 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2011-01-23 02:27:20 -0200 |
| commit | f5c848eed769b795ac9c06bfb315e4aa9116337c (patch) | |
| tree | cfa3bd1355e47295874dc9d73fb3403ee18a6e58 /target-i386 | |
| parent | bb44e0d12df70bd4a653341db4446daf6a9326be (diff) | |
x86: Optionally dump code bytes on cpu_dump_state
Introduce the cpu_dump_state flag CPU_DUMP_CODE and implement it for
x86. This writes out the code bytes around the current instruction
pointer. Make use of this feature in KVM to help debugging fatal vm
exits.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'target-i386')
| -rw-r--r-- | target-i386/helper.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/target-i386/helper.c b/target-i386/helper.c index 6dfa27d51b..1217452e71 100644 --- a/target-i386/helper.c +++ b/target-i386/helper.c @@ -249,6 +249,9 @@ done: cpu_fprintf(f, "\n"); } +#define DUMP_CODE_BYTES_TOTAL 50 +#define DUMP_CODE_BYTES_BACKWARD 20 + void cpu_dump_state(CPUState *env, FILE *f, fprintf_function cpu_fprintf, int flags) { @@ -434,6 +437,24 @@ void cpu_dump_state(CPUState *env, FILE *f, fprintf_function cpu_fprintf, cpu_fprintf(f, " "); } } + if (flags & CPU_DUMP_CODE) { + target_ulong base = env->segs[R_CS].base + env->eip; + target_ulong offs = MIN(env->eip, DUMP_CODE_BYTES_BACKWARD); + uint8_t code; + char codestr[3]; + + cpu_fprintf(f, "Code="); + for (i = 0; i < DUMP_CODE_BYTES_TOTAL; i++) { + if (cpu_memory_rw_debug(env, base - offs + i, &code, 1, 0) == 0) { + snprintf(codestr, sizeof(codestr), "%02x", code); + } else { + snprintf(codestr, sizeof(codestr), "??"); + } + cpu_fprintf(f, "%s%s%s%s", i > 0 ? " " : "", + i == offs ? "<" : "", codestr, i == offs ? ">" : ""); + } + cpu_fprintf(f, "\n"); + } } /***********************************************************/ |