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Fri, 24 May 2024 01:10:24 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEVe1dL0yunhUsZRGQ99Cw800q/hFGYEbQ+PG473cDCldXlnmQ5EkE3CLVzZ91/CxAnN8E13w== X-Received: by 2002:a17:906:2b82:b0:a62:2cae:c10 with SMTP id a640c23a62f3a-a6264f1600dmr109625666b.47.1716538224009; Fri, 24 May 2024 01:10:24 -0700 (PDT) Received: from avogadro.local ([151.95.155.52]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a626cc8c287sm89414966b.162.2024.05.24.01.10.22 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 May 2024 01:10:22 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PATCH 02/16] target/i386: cleanup eob handling of RSM Date: Fri, 24 May 2024 10:10:05 +0200 Message-ID: <20240524081019.1141359-3-pbonzini@redhat.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240524081019.1141359-1-pbonzini@redhat.com> References: <20240524081019.1141359-1-pbonzini@redhat.com> MIME-Version: 1.0 Received-SPF: pass client-ip=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H4=0.001, RCVD_IN_MSPIKE_WL=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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org gen_helper_rsm cannot generate an exception, and reloads the flags. So there's no need to spill cc_op and update cpu_eip, but on the other hand cc_op must be reset to CC_OP_EFLAGS before returning. It all works by chance, because by spilling cc_op before the call to the helper, it becomes non-dirty and gen_eob will not overwrite the CC_OP_EFLAGS value that is placed there by the helper. But let's clean it up. Signed-off-by: Paolo Bonzini Reviewed-by: Richard Henderson --- target/i386/tcg/translate.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c index f44edb3c29c..3c7d8d72144 100644 --- a/target/i386/tcg/translate.c +++ b/target/i386/tcg/translate.c @@ -4488,9 +4488,8 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b) /* we should not be in SMM mode */ g_assert_not_reached(); #else - gen_update_cc_op(s); - gen_update_eip_next(s); gen_helper_rsm(tcg_env); + set_cc_op(s, CC_OP_EFLAGS); #endif /* CONFIG_USER_ONLY */ s->base.is_jmp = DISAS_EOB_ONLY; break;