From 154c69f2b8512bdbfcd48a82bfd902e9449a895a Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Fri, 15 Feb 2019 17:16:39 +0100 Subject: target/ppc: Fix nip on power management instructions MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Those instructions currently raise an exception from within the helper. This tends to result in a bogus nip value in the env context (typically the beginning of the TB). Such a helper needs a gen_update_nip() first. This fixes it with a different approach which is to throw the exception from translate.c instead of the helper using gen_exception_nip() which does the right thing. Exception EXCP_HLT is also used instead of POWERPC_EXCP_STOP to effectively exit from the CPU execution loop. Signed-off-by: Benjamin Herrenschmidt [clg : modified the commit log to comment the use of EXCP_HLT instead of POWERPC_EXCP_STOP] Signed-off-by: Cédric Le Goater Message-Id: <20190215161648.9600-2-clg@kaod.org> Signed-off-by: David Gibson --- target/ppc/excp_helper.c | 1 - target/ppc/translate.c | 12 ++++++++---- 2 files changed, 8 insertions(+), 5 deletions(-) (limited to 'target') diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c index 751d759..8407e0a 100644 --- a/target/ppc/excp_helper.c +++ b/target/ppc/excp_helper.c @@ -958,7 +958,6 @@ void helper_pminsn(CPUPPCState *env, powerpc_pm_insn_t insn) * but this doesn't seem to be a problem. */ env->msr |= (1ull << MSR_EE); - raise_exception(env, EXCP_HLT); } #endif /* defined(TARGET_PPC64) */ diff --git a/target/ppc/translate.c b/target/ppc/translate.c index f4d70e7..bffdbd9 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -3566,7 +3566,8 @@ static void gen_doze(DisasContext *ctx) t = tcg_const_i32(PPC_PM_DOZE); gen_helper_pminsn(cpu_env, t); tcg_temp_free_i32(t); - gen_stop_exception(ctx); + /* Stop translation, as the CPU is supposed to sleep from now */ + gen_exception_nip(ctx, EXCP_HLT, ctx->base.pc_next); #endif /* defined(CONFIG_USER_ONLY) */ } @@ -3581,7 +3582,8 @@ static void gen_nap(DisasContext *ctx) t = tcg_const_i32(PPC_PM_NAP); gen_helper_pminsn(cpu_env, t); tcg_temp_free_i32(t); - gen_stop_exception(ctx); + /* Stop translation, as the CPU is supposed to sleep from now */ + gen_exception_nip(ctx, EXCP_HLT, ctx->base.pc_next); #endif /* defined(CONFIG_USER_ONLY) */ } @@ -3601,7 +3603,8 @@ static void gen_sleep(DisasContext *ctx) t = tcg_const_i32(PPC_PM_SLEEP); gen_helper_pminsn(cpu_env, t); tcg_temp_free_i32(t); - gen_stop_exception(ctx); + /* Stop translation, as the CPU is supposed to sleep from now */ + gen_exception_nip(ctx, EXCP_HLT, ctx->base.pc_next); #endif /* defined(CONFIG_USER_ONLY) */ } @@ -3616,7 +3619,8 @@ static void gen_rvwinkle(DisasContext *ctx) t = tcg_const_i32(PPC_PM_RVWINKLE); gen_helper_pminsn(cpu_env, t); tcg_temp_free_i32(t); - gen_stop_exception(ctx); + /* Stop translation, as the CPU is supposed to sleep from now */ + gen_exception_nip(ctx, EXCP_HLT, ctx->base.pc_next); #endif /* defined(CONFIG_USER_ONLY) */ } #endif /* #if defined(TARGET_PPC64) */ -- cgit v1.1