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[Qemu-devel] [PATCH v17 06/21] cpu-exec: allow temporary disabling icoun
From: |
Pavel Dovgalyuk |
Subject: |
[Qemu-devel] [PATCH v17 06/21] cpu-exec: allow temporary disabling icount |
Date: |
Mon, 07 Sep 2015 11:40:42 +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 1f8046f..4bcd7a6 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -240,7 +240,7 @@ 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(CPUState *cpu, int max_cycles,
- TranslationBlock *orig_tb)
+ TranslationBlock *orig_tb, bool ignore_icount)
{
TranslationBlock *tb;
@@ -250,7 +250,8 @@ static void cpu_exec_nocache(CPUState *cpu, int max_cycles,
max_cycles = CF_COUNT_MASK;
tb = tb_gen_code(cpu, orig_tb->pc, orig_tb->cs_base, orig_tb->flags,
- max_cycles | CF_NOCACHE);
+ max_cycles | CF_NOCACHE
+ | (ignore_icount ? CF_IGNORE_ICOUNT : 0));
tb->orig_tb = tcg_ctx.tb_ctx.tb_invalidated_flag ? NULL : orig_tb;
cpu->current_tb = tb;
/* execute the generated code */
@@ -555,7 +556,7 @@ int cpu_exec(CPUState *cpu)
if (insns_left > 0) {
/* Execute remaining instructions. */
tb = (TranslationBlock *)(next_tb &
~TB_EXIT_MASK);
- cpu_exec_nocache(cpu, insns_left, tb);
+ cpu_exec_nocache(cpu, 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 f500dff..878a16e 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -199,6 +199,7 @@ 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 2a40530..c2ba423 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -1007,7 +1007,7 @@ 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] [PATCH v17 00/21] Deterministic replay core, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 01/21] i386: partial revert of interrupt poll fix, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 02/21] replay: global variables and function stubs, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 03/21] replay: internal functions for replay log, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 04/21] replay: introduce mutex to protect the replay log, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 05/21] replay: introduce icount event, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 06/21] cpu-exec: allow temporary disabling icount,
Pavel Dovgalyuk <=
- [Qemu-devel] [PATCH v17 07/21] cpu: replay instructions sequence, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 08/21] i386: interrupt poll processing, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 09/21] replay: interrupts and exceptions, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 10/21] replay: asynchronous events infrastructure, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 11/21] replay: recording and replaying clock ticks, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 12/21] replay: shutdown event, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 13/21] icount: improve counting for record/replay, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 14/21] replay: checkpoints, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 15/21] bottom halves: introduce bh call function, Pavel Dovgalyuk, 2015/09/07
- [Qemu-devel] [PATCH v17 16/21] replay: ptimer, Pavel Dovgalyuk, 2015/09/07