[Qemu-devel] [PATCH v2 3/7] qemu-log: Improve the "exec" TB execution logging

["Alex Bennée" <alex.bennee@linaro.org>]

From: Peter Maydell <peter.maydell@linaro.org>

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>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
[AJB: reword patch title]

diff --git a/cpu-exec.c b/cpu-exec.c
index 0914d3c..40bdf88 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 f9ac332..64b8afd 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);
 
-- 
1.9.1