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Sun, 20 Oct 2024 08:53:47 -0700 (PDT) X-Received: by 2002:adf:ef50:0:b0:37d:54a0:d0a1 with SMTP id ffacd0b85a97d-37eb4897a21mr5463486f8f.56.1729439626540; Sun, 20 Oct 2024 08:53:46 -0700 (PDT) Received: from avogadro.local ([151.95.144.54]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37ee095bec2sm2040612f8f.0.2024.10.20.08.53.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Oct 2024 08:53:44 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org Subject: [PATCH 06/14] target/i386: Wrap cc_op_live with a validity check Date: Sun, 20 Oct 2024 17:53:16 +0200 Message-ID: <20241020155324.35273-7-pbonzini@redhat.com> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241020155324.35273-1-pbonzini@redhat.com> References: <20241020155324.35273-1-pbonzini@redhat.com> MIME-Version: 1.0 Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.527, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1.699, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org From: Richard Henderson Assert that op is known and that cc_op_live_ is populated. Signed-off-by: Paolo Bonzini Reviewed-by: Richard Henderson --- target/i386/cpu.h | 1 - target/i386/tcg/translate.c | 21 ++++++++++++++++++--- target/i386/tcg/decode-new.c.inc | 2 +- target/i386/tcg/emit.c.inc | 4 ++-- 4 files changed, 21 insertions(+), 7 deletions(-) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 51a0a463c3e..782e329c15c 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1359,7 +1359,6 @@ typedef enum { #define CC_OP_LAST_BWLQ CC_OP_POPCNTQ__ CC_OP_DYNAMIC, /* must use dynamic code to get cc_op */ - CC_OP_NB, } CCOp; /* See X86DecodedInsn.cc_op, using int8_t. */ diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c index 46062002c02..1a9a2fe709e 100644 --- a/target/i386/tcg/translate.c +++ b/target/i386/tcg/translate.c @@ -291,7 +291,7 @@ enum { }; /* Bit set if the global variable is live after setting CC_OP to X. */ -static const uint8_t cc_op_live[CC_OP_NB] = { +static const uint8_t cc_op_live_[] = { [CC_OP_DYNAMIC] = USES_CC_DST | USES_CC_SRC | USES_CC_SRC2, [CC_OP_EFLAGS] = USES_CC_SRC, [CC_OP_MULB ... CC_OP_MULQ] = USES_CC_DST | USES_CC_SRC, @@ -312,6 +312,21 @@ static const uint8_t cc_op_live[CC_OP_NB] = { [CC_OP_POPCNT] = USES_CC_DST, }; +static uint8_t cc_op_live(CCOp op) +{ + uint8_t result; + assert(op >= 0 && op < ARRAY_SIZE(cc_op_live_)); + + /* + * Check that the array is fully populated. A zero entry would correspond + * to a fixed value of EFLAGS, which can be obtained with CC_OP_EFLAGS + * as well. + */ + result = cc_op_live_[op]; + assert(result); + return result; +} + static void set_cc_op_1(DisasContext *s, CCOp op, bool dirty) { int dead; @@ -321,7 +336,7 @@ static void set_cc_op_1(DisasContext *s, CCOp op, bool dirty) } /* Discard CC computation that will no longer be used. */ - dead = cc_op_live[s->cc_op] & ~cc_op_live[op]; + dead = cc_op_live(s->cc_op) & ~cc_op_live(op); if (dead & USES_CC_DST) { tcg_gen_discard_tl(cpu_cc_dst); } @@ -808,7 +823,7 @@ static void gen_mov_eflags(DisasContext *s, TCGv reg) src2 = cpu_cc_src2; /* Take care to not read values that are not live. */ - live = cc_op_live[s->cc_op] & ~USES_CC_SRCT; + live = cc_op_live(s->cc_op) & ~USES_CC_SRCT; dead = live ^ (USES_CC_DST | USES_CC_SRC | USES_CC_SRC2); if (dead) { TCGv zero = tcg_constant_tl(0); diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc index 1f193716468..ee2a508ae9a 100644 --- a/target/i386/tcg/decode-new.c.inc +++ b/target/i386/tcg/decode-new.c.inc @@ -2865,7 +2865,7 @@ static void disas_insn(DisasContext *s, CPUState *cpu) tcg_gen_mov_i32(cpu_cc_op, decode.cc_op_dynamic); } set_cc_op(s, decode.cc_op); - cc_live = cc_op_live[decode.cc_op]; + cc_live = cc_op_live(decode.cc_op); } else { cc_live = 0; } diff --git a/target/i386/tcg/emit.c.inc b/target/i386/tcg/emit.c.inc index 45ac5edb1ae..785ff63f2ac 100644 --- a/target/i386/tcg/emit.c.inc +++ b/target/i386/tcg/emit.c.inc @@ -3777,13 +3777,13 @@ static void gen_shift_dynamic_flags(DisasContext *s, X86DecodedInsn *decode, TCG decode->cc_op_dynamic = tcg_temp_new_i32(); assert(decode->cc_dst == s->T0); - if (cc_op_live[s->cc_op] & USES_CC_DST) { + if (cc_op_live(s->cc_op) & USES_CC_DST) { decode->cc_dst = tcg_temp_new(); tcg_gen_movcond_tl(TCG_COND_EQ, decode->cc_dst, count, tcg_constant_tl(0), cpu_cc_dst, s->T0); } - if (cc_op_live[s->cc_op] & USES_CC_SRC) { + if (cc_op_live(s->cc_op) & USES_CC_SRC) { tcg_gen_movcond_tl(TCG_COND_EQ, decode->cc_src, count, tcg_constant_tl(0), cpu_cc_src, decode->cc_src); }