aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPeter Maydell <peter.maydell@linaro.org>2014-03-27 12:43:44 +0000
committerPeter Maydell <peter.maydell@linaro.org>2014-03-27 12:43:44 +0000
commitda59329279e5d402d3e0cd0a22224ebd4bcc3ef1 (patch)
treeab3233a5409f45b3dc29328e32187ee98740bae1
parent89e7f57831f6d981b16526e366a0bc6f5803dd3c (diff)
downloadqemu-arm-better-exec-logging.tar.gz
cpu-exec: Improve the TB execution loggingbetter-exec-logging
Improve the TB execution logging so that it is easier to identify what is happening from trace logs: * move the "Trace" logging of executed TBs into cpu_tb_exec() so that it is emitted if and only if we actually execute a TB, and for consistency for the CPU state logging * log when we link two TBs together via tb_add_jump() * log when cpu_tb_exec() returns early from a chain of TBs The new style logging looks like this: Trace 0x7fb7cc822ca0 [ffffffc0000dce00] Linking TBs 0x7fb7cc822ca0 [ffffffc0000dce00] index 0 -> 0x7fb7cc823110 [ffffffc0000dce10] Trace 0x7fb7cc823110 [ffffffc0000dce10] Trace 0x7fb7cc823420 [ffffffc000302688] Trace 0x7fb7cc8234a0 [ffffffc000302698] Trace 0x7fb7cc823520 [ffffffc0003026a4] Trace 0x7fb7cc823560 [ffffffc0000dce44] Linking TBs 0x7fb7cc823560 [ffffffc0000dce44] index 1 -> 0x7fb7cc8235d0 [ffffffc0000dce70] Trace 0x7fb7cc8235d0 [ffffffc0000dce70] Abandoned execution of TB chain before 0x7fb7cc8235d0 [ffffffc0000dce70] Trace 0x7fb7cc8235d0 [ffffffc0000dce70] Trace 0x7fb7cc822fd0 [ffffffc0000dd52c] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--cpu-exec.c20
-rw-r--r--include/exec/exec-all.h3
2 files changed, 14 insertions, 9 deletions
diff --git a/cpu-exec.c b/cpu-exec.c
index 0914d3c85c..40bdf889fc 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -43,10 +43,14 @@ void cpu_resume_from_signal(CPUState *cpu, void *puc)
#endif
/* Execute a TB, and fix up the CPU state afterwards if necessary */
-static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, uint8_t *tb_ptr)
+static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, TranslationBlock *itb)
{
CPUArchState *env = cpu->env_ptr;
uintptr_t next_tb;
+ uint8_t *tb_ptr = itb->tc_ptr;
+
+ qemu_log_mask(CPU_LOG_EXEC, "Trace %p [" TARGET_FMT_lx "] %s\n",
+ itb->tc_ptr, itb->pc, lookup_symbol(itb->pc));
#if defined(DEBUG_DISAS)
if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
@@ -72,6 +76,10 @@ static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, uint8_t *tb_ptr)
*/
CPUClass *cc = CPU_GET_CLASS(cpu);
TranslationBlock *tb = (TranslationBlock *)(next_tb & ~TB_EXIT_MASK);
+ qemu_log_mask(CPU_LOG_EXEC,
+ "Abandoned execution of TB chain before %p ["
+ TARGET_FMT_lx "] %s\n",
+ itb->tc_ptr, itb->pc, lookup_symbol(itb->pc));
if (cc->synchronize_from_tb) {
cc->synchronize_from_tb(cpu, tb);
} else {
@@ -105,7 +113,7 @@ static void cpu_exec_nocache(CPUArchState *env, int max_cycles,
max_cycles);
cpu->current_tb = tb;
/* execute the generated code */
- cpu_tb_exec(cpu, tb->tc_ptr);
+ cpu_tb_exec(cpu, tb);
cpu->current_tb = NULL;
tb_phys_invalidate(tb, -1);
tb_free(tb);
@@ -225,7 +233,6 @@ int cpu_exec(CPUArchState *env)
#endif
int ret, interrupt_request;
TranslationBlock *tb;
- uint8_t *tc_ptr;
uintptr_t next_tb;
if (cpu->halted) {
@@ -610,10 +617,6 @@ int cpu_exec(CPUArchState *env)
next_tb = 0;
tcg_ctx.tb_ctx.tb_invalidated_flag = 0;
}
- if (qemu_loglevel_mask(CPU_LOG_EXEC)) {
- qemu_log("Trace %p [" TARGET_FMT_lx "] %s\n",
- tb->tc_ptr, tb->pc, lookup_symbol(tb->pc));
- }
/* see if we can patch the calling TB. When the TB
spans two pages, we cannot safely do a direct
jump. */
@@ -630,9 +633,8 @@ int cpu_exec(CPUArchState *env)
cpu->current_tb = tb;
barrier();
if (likely(!cpu->exit_request)) {
- tc_ptr = tb->tc_ptr;
/* execute the generated code */
- next_tb = cpu_tb_exec(cpu, tc_ptr);
+ next_tb = cpu_tb_exec(cpu, tb);
switch (next_tb & TB_EXIT_MASK) {
case TB_EXIT_REQUESTED:
/* Something asked us to stop executing
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index f9ac332f9d..64b8afd6b0 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -288,6 +288,9 @@ static inline void tb_add_jump(TranslationBlock *tb, int n,
{
/* NOTE: this test is only needed for thread safety */
if (!tb->jmp_next[n]) {
+ qemu_log_mask(CPU_LOG_EXEC, "Linking TBs %p [" TARGET_FMT_lx
+ "] index %d -> %p [" TARGET_FMT_lx "]\n",
+ tb->tc_ptr, tb->pc, n, tb_next->tc_ptr, tb_next->pc);
/* patch the native jump address */
tb_set_jmp_target(tb, n, (uintptr_t)tb_next->tc_ptr);