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Sat, 18 Sep 2021 11:45:44 -0700 (PDT) Received: from localhost.localdomain ([71.212.134.125]) by smtp.gmail.com with ESMTPSA id y26sm9555858pfe.69.2021.09.18.11.45.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 18 Sep 2021 11:45:44 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 19/41] hw/core: Add TCGCPUOps.record_sigsegv Date: Sat, 18 Sep 2021 11:45:05 -0700 Message-Id: <20210918184527.408540-20-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210918184527.408540-1-richard.henderson@linaro.org> References: <20210918184527.408540-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::529; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x529.google.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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: laurent@vivier.eu Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Add a new user-only interface for updating cpu state before raising a signal. This will replace tlb_fill for user-only and should result in less boilerplate for each guest. Signed-off-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé --- include/hw/core/tcg-cpu-ops.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/include/hw/core/tcg-cpu-ops.h b/include/hw/core/tcg-cpu-ops.h index 4a4c4053e3..e229a40772 100644 --- a/include/hw/core/tcg-cpu-ops.h +++ b/include/hw/core/tcg-cpu-ops.h @@ -114,6 +114,32 @@ struct TCGCPUOps { */ bool (*io_recompile_replay_branch)(CPUState *cpu, const TranslationBlock *tb); +#else + /** + * record_sigsegv: + * @cpu: cpu context + * @addr: faulting guest address + * @access_type: access was read/write/execute + * @maperr: true for invalid page, false for permission fault + * @ra: host pc for unwinding + * + * We are about to raise SIGSEGV with si_code set for @maperr, + * and si_addr set for @addr. Record anything further needed + * for the signal ucontext_t. + * + * If the emulated kernel does not provide anything to the signal + * handler with anything besides the user context registers, and + * the siginfo_t, then this hook need do nothing and may be omitted. + * Otherwise, record the data and return; the caller will raise + * the signal, unwind the cpu state, and return to the main loop. + * + * If it is simpler to re-use the sysemu tlb_fill code, @ra is provided + * so that a "normal" cpu exception can be raised. In this case, + * the signal must be raised by the architecture cpu_loop. + */ + void (*record_sigsegv)(CPUState *cpu, vaddr addr, + MMUAccessType access_type, + bool maperr, uintptr_t ra); #endif /* CONFIG_SOFTMMU */ #endif /* NEED_CPU_H */