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qemu-log: Improve the "exec" TB execution 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]
Stopped execution of TB chain before 0x7fb7cc8235d0 [ffffffc0000dce70]
Trace 0x7fb7cc8235d0 [ffffffc0000dce70]
Trace 0x7fb7cc822fd0 [ffffffc0000dd52c]

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
[AJB: reword patch title, Abandoned->Stopped]
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1458052224-9316-6-git-send-email-alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Maydell 2016-03-15 14:30:19 +00:00 committed by Paolo Bonzini
parent 7ee606230e
commit 1a83063522
2 changed files with 14 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
cpu-exec.c
View File

@ -133,10 +133,14 @@ static void init_delay_params(SyncClocks *sc, const CPUState *cpu)
#endif /* CONFIG USER ONLY */
/* 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)) {
@ -167,6 +171,10 @@ 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,
"Stopped 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 {
@ -202,7 +210,7 @@ static void cpu_exec_nocache(CPUState *cpu, int 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_tb_exec(cpu, tb);
cpu->current_tb = NULL;
tb_phys_invalidate(tb, -1);
tb_free(tb);
@ -344,7 +352,6 @@ int cpu_exec(CPUState *cpu)
#endif
int ret, interrupt_request;
TranslationBlock *tb;
uint8_t *tc_ptr;
uintptr_t next_tb;
SyncClocks sc;
@ -500,10 +507,6 @@ int cpu_exec(CPUState *cpu)
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. */
@ -515,10 +518,9 @@ int cpu_exec(CPUState *cpu)
tb_unlock();
if (likely(!cpu->exit_request)) {
trace_exec_tb(tb, tb->pc);
tc_ptr = tb->tc_ptr;
/* execute the generated code */
cpu->current_tb = tb;
next_tb = cpu_tb_exec(cpu, tc_ptr);
next_tb = cpu_tb_exec(cpu, tb);
cpu->current_tb = NULL;
switch (next_tb & TB_EXIT_MASK) {
case TB_EXIT_REQUESTED:

3
include/exec/exec-all.h
View File

@ -379,6 +379,9 @@ 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);