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Thu, 18 Jan 2024 04:24:37 -0800 (PST) X-Google-Smtp-Source: AGHT+IESFeK504yxarmh08xTFAV3Lyci60HkJtiogSq0c8jZS+IXwuNHeDZleJU3A+k5v4Twyp2VNw== X-Received: by 2002:a05:6512:491:b0:50e:62b1:f67b with SMTP id v17-20020a056512049100b0050e62b1f67bmr185973lfq.134.1705580676816; Thu, 18 Jan 2024 04:24:36 -0800 (PST) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Richard Henderson , qemu-stable@nongnu.org, Michael Tokarev Subject: [PULL 11/16] target/i386: Do not re-compute new pc with CF_PCREL Date: Thu, 18 Jan 2024 13:24:11 +0100 Message-ID: <20240118122416.9209-12-pbonzini@redhat.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240118122416.9209-1-pbonzini@redhat.com> References: <20240118122416.9209-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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: -38 X-Spam_score: -3.9 X-Spam_bar: --- X-Spam_report: (-3.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.806, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1705580735909100003 Content-Type: text/plain; charset="utf-8" From: Richard Henderson With PCREL, we have a page-relative view of EIP, and an approximation of PC =3D EIP+CSBASE that is good enough to detect page crossings. If we try to recompute PC after masking EIP, we will mess up that approximation and write a corrupt value to EIP. We already handled masking properly for PCREL, so the fix in b5e0d5d2 was only needed for the !PCREL path. Cc: qemu-stable@nongnu.org Fixes: b5e0d5d22fbf ("target/i386: Fix 32-bit wrapping of pc/eip computatio= n") Reported-by: Michael Tokarev Signed-off-by: Richard Henderson Message-ID: <20240101230617.129349-1-richard.henderson@linaro.org> Signed-off-by: Paolo Bonzini --- target/i386/tcg/translate.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c index e1eb82a5c68..d4d7e904adb 100644 --- a/target/i386/tcg/translate.c +++ b/target/i386/tcg/translate.c @@ -2866,10 +2866,6 @@ static void gen_jmp_rel(DisasContext *s, MemOp ot, i= nt diff, int tb_num) } } new_eip &=3D mask; - new_pc =3D new_eip + s->cs_base; - if (!CODE64(s)) { - new_pc =3D (uint32_t)new_pc; - } =20 gen_update_cc_op(s); set_cc_op(s, CC_OP_DYNAMIC); @@ -2885,6 +2881,8 @@ static void gen_jmp_rel(DisasContext *s, MemOp ot, in= t diff, int tb_num) tcg_gen_andi_tl(cpu_eip, cpu_eip, mask); use_goto_tb =3D false; } + } else if (!CODE64(s)) { + new_pc =3D (uint32_t)(new_eip + s->cs_base); } =20 if (use_goto_tb && translator_use_goto_tb(&s->base, new_pc)) { --=20 2.43.0