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[Qemu-devel] [RFC PATCH v8 07/21] cpu-exec: allow temporary disabling ic
From: |
Pavel Dovgalyuk |
Subject: |
[Qemu-devel] [RFC PATCH v8 07/21] cpu-exec: allow temporary disabling icount |
Date: |
Thu, 22 Jan 2015 11:52:10 +0300 |
User-agent: |
StGit/0.16 |
This patch is required for deterministic replay to generate an exception
by trying executing an instruction without changing icount.
It adds new flag to TB for disabling icount while translating it.
Signed-off-by: Paolo Bonzini <address@hidden>
Signed-off-by: Pavel Dovgalyuk <address@hidden>
---
cpu-exec.c | 7 ++++---
include/exec/exec-all.h | 1 +
translate-all.c | 2 +-
3 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/cpu-exec.c b/cpu-exec.c
index 0a485bb..49f01f5 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -200,7 +200,7 @@ static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu,
uint8_t *tb_ptr)
/* Execute the code without caching the generated code. An interpreter
could be used if available. */
static void cpu_exec_nocache(CPUArchState *env, int max_cycles,
- TranslationBlock *orig_tb)
+ TranslationBlock *orig_tb, bool ignore_icount)
{
CPUState *cpu = ENV_GET_CPU(env);
TranslationBlock *tb;
@@ -216,7 +216,8 @@ static void cpu_exec_nocache(CPUArchState *env, int
max_cycles,
/* tb_gen_code can flush our orig_tb, invalidate it now */
tb_phys_invalidate(orig_tb, -1);
tb = tb_gen_code(cpu, pc, cs_base, flags,
- max_cycles | CF_NOCACHE);
+ max_cycles | CF_NOCACHE
+ | (ignore_icount ? CF_IGNORE_ICOUNT : 0));
cpu->current_tb = tb;
/* execute the generated code */
trace_exec_tb_nocache(tb, tb->pc);
@@ -525,7 +526,7 @@ int cpu_exec(CPUArchState *env)
} else {
if (insns_left > 0) {
/* Execute remaining instructions. */
- cpu_exec_nocache(env, insns_left, tb);
+ cpu_exec_nocache(env, insns_left, tb, false);
align_clocks(&sc, cpu);
}
cpu->exception_index = EXCP_INTERRUPT;
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 63fb1a3..48a7541 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -148,6 +148,7 @@ struct TranslationBlock {
#define CF_LAST_IO 0x8000 /* Last insn may be an IO access. */
#define CF_NOCACHE 0x10000 /* To be freed after execution */
#define CF_USE_ICOUNT 0x20000
+#define CF_IGNORE_ICOUNT 0x40000 /* Do not generate icount code */
void *tc_ptr; /* pointer to the translated code */
/* next matching tb for physical address. */
diff --git a/translate-all.c b/translate-all.c
index c0cba7d..49b3403 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -1053,7 +1053,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
int code_gen_size;
phys_pc = get_page_addr_code(env, pc);
- if (use_icount) {
+ if (use_icount && !(cflags & CF_IGNORE_ICOUNT)) {
cflags |= CF_USE_ICOUNT;
}
tb = tb_alloc(pc);
- [Qemu-devel] [RFC PATCH v8 02/21] replay: global variables and function stubs, (continued)
- [Qemu-devel] [RFC PATCH v8 02/21] replay: global variables and function stubs, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 03/21] sysemu: system functions for replay, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 05/21] replay: introduce mutex to protect the replay log, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 04/21] replay: internal functions for replay log, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 06/21] replay: introduce icount event, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 07/21] cpu-exec: allow temporary disabling icount,
Pavel Dovgalyuk <=
- [Qemu-devel] [RFC PATCH v8 08/21] cpu: replay instructions sequence, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 09/21] replay: interrupts and exceptions, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 10/21] replay: asynchronous events infrastructure, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 11/21] replay: recording and replaying clock ticks, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 12/21] replay: recording and replaying different timers, Pavel Dovgalyuk, 2015/01/22