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[Qemu-devel] [PULL 17/18] trace: add some tcg tracing support
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PULL 17/18] trace: add some tcg tracing support |
Date: |
Tue, 12 Aug 2014 14:37:54 +0100 |
From: Alex Bennée <address@hidden>
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 <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
cpu-exec.c | 6 ++++++
trace-events | 9 +++++++++
translate-all.c | 3 +++
3 files changed, 18 insertions(+)
diff --git a/cpu-exec.c b/cpu-exec.c
index cbc8067..c6aad74 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);
diff --git a/trace-events b/trace-events
index 11a17a8..dcc33dd 100644
--- a/trace-events
+++ b/trace-events
@@ -1265,6 +1265,15 @@ kvm_failed_spr_get(int str, const char *msg) "Warning:
Unable to retrieve SPR %d
kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to retrieve
ONEREG %" PRIu64 " from KVM: %s"
kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to set
ONEREG %" PRIu64 " to KVM: %s"
+# TCG related tracing (mostly disabled by default)
+# cpu-exec.c
+disable exec_tb(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR
+disable exec_tb_nocache(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR
+disable exec_tb_exit(void *next_tb, unsigned int flags) "tb:%p flags=%x"
+
+# translate-all.c
+translate_block(void *tb, uintptr_t pc, uint8_t *tb_code) "tb:%p,
pc:0x%"PRIxPTR", tb_code:%p"
+
# memory.c
memory_region_ops_read(void *mr, uint64_t addr, uint64_t value, unsigned size)
"mr %p addr %#"PRIx64" value %#"PRIx64" size %u"
memory_region_ops_write(void *mr, uint64_t addr, uint64_t value, unsigned
size) "mr %p addr %#"PRIx64" value %#"PRIx64" size %u"
diff --git a/translate-all.c b/translate-all.c
index 8f7e11b..2e0265a 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -33,6 +33,7 @@
#include "qemu-common.h"
#define NO_CPU_IO_DEFS
#include "cpu.h"
+#include "trace.h"
#include "disas/disas.h"
#include "tcg.h"
#if defined(CONFIG_USER_ONLY)
@@ -158,6 +159,8 @@ int cpu_gen_code(CPUArchState *env, TranslationBlock *tb,
int *gen_code_size_ptr
gen_intermediate_code(env, tb);
+ trace_translate_block(tb, tb->pc, tb->tc_ptr);
+
/* generate machine code */
gen_code_buf = tb->tc_ptr;
tb->tb_next_offset[0] = 0xffff;
--
1.9.3
- [Qemu-devel] [PULL 07/18] trace: [tcg] Argument type transformation machinery, (continued)
- [Qemu-devel] [PULL 07/18] trace: [tcg] Argument type transformation machinery, Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 08/18] trace: [tcg] Add 'tcg' event property, Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 10/18] trace: [tcg] Define TCG tracing helper routines, Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 09/18] trace: [tcg] Declare TCG tracing helper routines, Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 11/18] trace: [tcg] Define TCG tracing helper routine wrappers, Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 12/18] trace: [tcg] Include TCG-tracing helpers, Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 13/18] trace: [tcg] Generate TCG tracing routines, Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 14/18] trace: [tcg] Include event definitions in "trace.h", Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 16/18] trace: teach lttng backend to use format strings, Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 15/18] trace: [tcg] Include TCG-tracing header on all targets, Stefan Hajnoczi, 2014/08/12
- [Qemu-devel] [PULL 17/18] trace: add some tcg tracing support,
Stefan Hajnoczi <=
- [Qemu-devel] [PULL 18/18] virtio-rng: add some trace events, Stefan Hajnoczi, 2014/08/12
- Re: [Qemu-devel] [PULL 00/18] Tracing patches, Peter Maydell, 2014/08/15