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cpu-exec: allow temporary disabling icount 

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 <pbonzini@redhat.com>

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162359.8676.77011.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2015-09-17 19:23:59 +03:00 committed by Paolo Bonzini
parent 26bc60ac82
commit 56c0269a9e
3 changed files with 6 additions and 4 deletions
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7
cpu-exec.c
View File

@ -184,7 +184,7 @@ 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;
@ -194,7 +194,8 @@ 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 */
@ -519,7 +520,7 @@ 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;

1
include/exec/exec-all.h
View File

@ -190,6 +190,7 @@ 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 */
uint8_t *tc_search; /* pointer to search data */

2
translate-all.c
View File

@ -1069,7 +1069,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
#endif
phys_pc = get_page_addr_code(env, pc);
if (use_icount) {
if (use_icount && !(cflags & CF_IGNORE_ICOUNT)) {
cflags |= CF_USE_ICOUNT;
}