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Fri, 12 Jan 2024 12:57:23 -0800 (PST) Received: from h-2001-9b1-c3c7-e600-85ca-d347-89f8-bacf.na.bahnhof.se ([2001:9b1:c3c7:e600:85ca:d347:89f8:bacf]) by smtp.gmail.com with ESMTPSA id c7-20020a196547000000b0050eabefd528sm610305lfj.88.2024.01.12.12.57.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jan 2024 12:57:22 -0800 (PST) Message-ID: <33f27425878fb529b9e39ef22c303f6e0d90525f.camel@rivosinc.com> Subject: [PATCH] linux-user: Fixed cpu restore with pc 0 on SIGBUS From: Robbin Ehn To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org, palmer@rivosinc.com Date: Fri, 12 Jan 2024 21:57:22 +0100 User-Agent: Evolution 3.50.0-1 MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::134; envelope-from=rehn@rivosinc.com; helo=mail-lf1-x134.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Commit f4e1168198 (linux-user: Split out host_sig{segv,bus}_handler) introduced a bug, when returning from host_sigbus_handler the PC is never set. Thus cpu_loop_exit_restore is called with a zero PC and we immediate get a SIGSEGV. Signed-off-by: Robbin Ehn Reviewed-by: Palmer Dabbelt --- linux-user/signal.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/linux-user/signal.c b/linux-user/signal.c index b35d1e512f..c9527adfa3 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -925,7 +925,7 @@ static void host_sigsegv_handler(CPUState *cpu, siginfo_t *info, cpu_loop_exit_sigsegv(cpu, guest_addr, access_type, maperr, pc); } -static void host_sigbus_handler(CPUState *cpu, siginfo_t *info, +static uintptr_t host_sigbus_handler(CPUState *cpu, siginfo_t *info, host_sigcontext *uc) { uintptr_t pc = host_signal_pc(uc); @@ -947,6 +947,7 @@ static void host_sigbus_handler(CPUState *cpu, siginfo_t *info, sigprocmask(SIG_SETMASK, host_signal_mask(uc), NULL); cpu_loop_exit_sigbus(cpu, guest_addr, access_type, pc); } + return pc; } static void host_signal_handler(int host_sig, siginfo_t *info, void *puc) @@ -974,7 +975,7 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc) host_sigsegv_handler(cpu, info, uc); return; case SIGBUS: - host_sigbus_handler(cpu, info, uc); + pc = host_sigbus_handler(cpu, info, uc); sync_sig = true; break; case SIGILL: