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| author | Alex Bennée <alex.bennee@linaro.org> | 2014-08-01 17:08:57 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-08-12 14:26:12 +0100 |
| commit | 6db8b538663b39c21e12e14e6437aa7f8435f316 (patch) | |
| tree | f18ecd38a421852c997b643bd8b56b720a263f7b /cpu-exec.c | |
| parent | 41ef7b00abff4d31814890a14e5a8e49a177508b (diff) | |
trace: add some tcg tracing support
This adds a couple of tcg specific trace-events which are useful for
tracing execution though tcg generated blocks. It's been tested with
lttng user space tracing but is generic enough for all systems. The tcg
events are:
* translate_block - when a subject block is translated
* exec_tb - when a translated block is entered
* exec_tb_exit - when we exit the translated code
* exec_tb_nocache - special case translations
Of course we can only trace the entrance to the first block of a chain
as each block will jump directly to the next when it can. See the -d
nochain patch to allow more complete tracing at the expense of
performance.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'cpu-exec.c')
| -rw-r--r-- | cpu-exec.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/cpu-exec.c b/cpu-exec.c index cbc8067b37..c6aad742e1 100644 --- a/cpu-exec.c +++ b/cpu-exec.c @@ -18,6 +18,7 @@ */ #include "config.h" #include "cpu.h" +#include "trace.h" #include "disas/disas.h" #include "tcg.h" #include "qemu/atomic.h" @@ -168,6 +169,9 @@ static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, uint8_t *tb_ptr) #endif /* DEBUG_DISAS */ next_tb = tcg_qemu_tb_exec(env, tb_ptr); + trace_exec_tb_exit((void *) (next_tb & ~TB_EXIT_MASK), + next_tb & TB_EXIT_MASK); + if ((next_tb & TB_EXIT_MASK) > TB_EXIT_IDX1) { /* We didn't start executing this TB (eg because the instruction * counter hit zero); we must restore the guest PC to the address @@ -208,6 +212,7 @@ static void cpu_exec_nocache(CPUArchState *env, int max_cycles, max_cycles); cpu->current_tb = tb; /* execute the generated code */ + trace_exec_tb_nocache(tb, tb->pc); cpu_tb_exec(cpu, tb->tc_ptr); cpu->current_tb = NULL; tb_phys_invalidate(tb, -1); @@ -749,6 +754,7 @@ int cpu_exec(CPUArchState *env) cpu->current_tb = tb; barrier(); if (likely(!cpu->exit_request)) { + trace_exec_tb(tb, tb->pc); tc_ptr = tb->tc_ptr; /* execute the generated code */ next_tb = cpu_tb_exec(cpu, tc_ptr); |