From 9ed5726c043958359b0f1fa44ab3e4f25f9d9a47 Mon Sep 17 00:00:00 2001 From: Nathan Froyd Date: Fri, 29 Oct 2010 07:48:46 -0700 Subject: [PATCH] target-mips: fix translation of MT instructions The translation of dmt/emt/dvpe/evpe was doing the moral equivalent of: int x; ... /* no initialization of x */ x = f (x); which confused later bits of TCG rather badly, leading to crashes. Fix the helpers to only return results (those instructions have no inputs), and fix the translation code accordingly. Signed-off-by: Nathan Froyd Signed-off-by: Aurelien Jarno --- target-mips/helper.h | 8 ++++---- target-mips/op_helper.c | 28 ++++++++-------------------- target-mips/translate.c | 8 ++++---- 3 files changed, 16 insertions(+), 28 deletions(-) diff --git a/target-mips/helper.h b/target-mips/helper.h index cb13fb235..297ab64bd 100644 --- a/target-mips/helper.h +++ b/target-mips/helper.h @@ -154,10 +154,10 @@ DEF_HELPER_2(mttlo, void, tl, i32) DEF_HELPER_2(mtthi, void, tl, i32) DEF_HELPER_2(mttacx, void, tl, i32) DEF_HELPER_1(mttdsp, void, tl) -DEF_HELPER_1(dmt, tl, tl) -DEF_HELPER_1(emt, tl, tl) -DEF_HELPER_1(dvpe, tl, tl) -DEF_HELPER_1(evpe, tl, tl) +DEF_HELPER_0(dmt, tl) +DEF_HELPER_0(emt, tl) +DEF_HELPER_0(dvpe, tl) +DEF_HELPER_0(evpe, tl) #endif /* !CONFIG_USER_ONLY */ /* microMIPS functions */ diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c index 41abd575f..ec6864d90 100644 --- a/target-mips/op_helper.c +++ b/target-mips/op_helper.c @@ -1554,40 +1554,28 @@ void helper_mttdsp(target_ulong arg1) } /* MIPS MT functions */ -target_ulong helper_dmt(target_ulong arg1) +target_ulong helper_dmt(void) { // TODO - arg1 = 0; - // rt = arg1 - - return arg1; + return 0; } -target_ulong helper_emt(target_ulong arg1) +target_ulong helper_emt(void) { // TODO - arg1 = 0; - // rt = arg1 - - return arg1; + return 0; } -target_ulong helper_dvpe(target_ulong arg1) +target_ulong helper_dvpe(void) { // TODO - arg1 = 0; - // rt = arg1 - - return arg1; + return 0; } -target_ulong helper_evpe(target_ulong arg1) +target_ulong helper_evpe(void) { // TODO - arg1 = 0; - // rt = arg1 - - return arg1; + return 0; } #endif /* !CONFIG_USER_ONLY */ diff --git a/target-mips/translate.c b/target-mips/translate.c index ba45eb0e5..cce77be0d 100644 --- a/target-mips/translate.c +++ b/target-mips/translate.c @@ -12033,22 +12033,22 @@ static void decode_opc (CPUState *env, DisasContext *ctx, int *is_branch) switch (op2) { case OPC_DMT: check_insn(env, ctx, ASE_MT); - gen_helper_dmt(t0, t0); + gen_helper_dmt(t0); gen_store_gpr(t0, rt); break; case OPC_EMT: check_insn(env, ctx, ASE_MT); - gen_helper_emt(t0, t0); + gen_helper_emt(t0); gen_store_gpr(t0, rt); break; case OPC_DVPE: check_insn(env, ctx, ASE_MT); - gen_helper_dvpe(t0, t0); + gen_helper_dvpe(t0); gen_store_gpr(t0, rt); break; case OPC_EVPE: check_insn(env, ctx, ASE_MT); - gen_helper_evpe(t0, t0); + gen_helper_evpe(t0); gen_store_gpr(t0, rt); break; case OPC_DI: