From c4d4525c38cd93cc5d1a743976eb25ac571d435f Mon Sep 17 00:00:00 2001 From: Pavel Dovgalyuk Date: Fri, 5 Dec 2014 12:11:13 +0300 Subject: [PATCH] target-i386: fix icount processing for repz instructions TCG generates optimized code for i386 repz instructions in single step mode. It means that when ecx becomes 0, execution of the string instruction breaks immediately without an additional iteration for ecx==0 (which will only check ecx and set the flags). Omitting this iteration leads to different instructions counting in singlestep mode and in normal execution. This patch disables optimization of this last iteration for icount mode which should be deterministic. v2: inverted the condition and formatted the comment Signed-off-by: Pavel Dovgalyuk Signed-off-by: Richard Henderson --- target-i386/translate.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/target-i386/translate.c b/target-i386/translate.c index 782f7d2666..6243e36661 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -115,6 +115,7 @@ typedef struct DisasContext { int tf; /* TF cpu flag */ int singlestep_enabled; /* "hardware" single step enabled */ int jmp_opt; /* use direct block chaining for direct jumps */ + int repz_opt; /* optimize jumps within repz instructions */ int mem_index; /* select memory access functions */ uint64_t flags; /* all execution flags */ struct TranslationBlock *tb; @@ -1215,7 +1216,7 @@ static inline void gen_repz_ ## op(DisasContext *s, TCGMemOp ot, \ gen_op_add_reg_im(s->aflag, R_ECX, -1); \ /* a loop would cause two single step exceptions if ECX = 1 \ before rep string_insn */ \ - if (!s->jmp_opt) \ + if (s->repz_opt) \ gen_op_jz_ecx(s->aflag, l2); \ gen_jmp(s, cur_eip); \ } @@ -1233,7 +1234,7 @@ static inline void gen_repz_ ## op(DisasContext *s, TCGMemOp ot, \ gen_op_add_reg_im(s->aflag, R_ECX, -1); \ gen_update_cc_op(s); \ gen_jcc1(s, (JCC_Z << 1) | (nz ^ 1), l2); \ - if (!s->jmp_opt) \ + if (s->repz_opt) \ gen_op_jz_ecx(s->aflag, l2); \ gen_jmp(s, cur_eip); \ } @@ -7951,6 +7952,17 @@ static inline void gen_intermediate_code_internal(X86CPU *cpu, || (flags & HF_SOFTMMU_MASK) #endif ); + /* Do not optimize repz jumps at all in icount mode, because + rep movsS instructions are execured with different paths + in !repz_opt and repz_opt modes. The first one was used + always except single step mode. And this setting + disables jumps optimization and control paths become + equivalent in run and single step modes. + Now there will be no jump optimization for repz in + record/replay modes and there will always be an + additional step for ecx=0 when icount is enabled. + */ + dc->repz_opt = !dc->jmp_opt && !use_icount; #if 0 /* check addseg logic */ if (!dc->addseg && (dc->vm86 || !dc->pe || !dc->code32))