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Sat, 08 Jun 2024 01:34:31 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFykmrOODqPKL7EYXWbYO/eQqSkcexDyW4HCsAL5qKGmwE3ONlJT/ui7SQPerCdE/D8L7b/Yw== X-Received: by 2002:a17:906:2542:b0:a68:bb1b:4de2 with SMTP id a640c23a62f3a-a6cd56108c6mr295955266b.3.1717835670900; Sat, 08 Jun 2024 01:34:30 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 05/42] target/i386: implement DR7.GD Date: Sat, 8 Jun 2024 10:33:38 +0200 Message-ID: <20240608083415.2769160-6-pbonzini@redhat.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240608083415.2769160-1-pbonzini@redhat.com> References: <20240608083415.2769160-1-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+importer2=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: -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, T_SCC_BODY_TEXT_LINE=-0.01 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+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1717835980952100001 Content-Type: text/plain; charset="utf-8" DR7.GD triggers a #DB exception on any access to debug registers. The GD bit is cleared so that the #DB handler itself can access the debug registers. Signed-off-by: Paolo Bonzini --- target/i386/tcg/sysemu/bpt_helper.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/target/i386/tcg/sysemu/bpt_helper.c b/target/i386/tcg/sysemu/b= pt_helper.c index 4d96a48a3ca..c1d5fce250c 100644 --- a/target/i386/tcg/sysemu/bpt_helper.c +++ b/target/i386/tcg/sysemu/bpt_helper.c @@ -238,6 +238,12 @@ target_ulong helper_get_dr(CPUX86State *env, int reg) } } =20 + if (env->dr[7] & DR7_GD) { + env->dr[7] &=3D ~DR7_GD; + env->dr[6] |=3D DR6_BD; + raise_exception_ra(env, EXCP01_DB, GETPC()); + } + return env->dr[reg]; } =20 @@ -251,6 +257,12 @@ void helper_set_dr(CPUX86State *env, int reg, target_u= long t0) } } =20 + if (env->dr[7] & DR7_GD) { + env->dr[7] &=3D ~DR7_GD; + env->dr[6] |=3D DR6_BD; + raise_exception_ra(env, EXCP01_DB, GETPC()); + } + if (reg < 4) { if (hw_breakpoint_enabled(env->dr[7], reg) && hw_breakpoint_type(env->dr[7], reg) !=3D DR7_TYPE_IO_RW) { --=20 2.45.1