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[71.237.47.177]) by smtp.gmail.com with ESMTPSA id a15-20020a056e02120f00b00313b281ecd2sm3104314ilq.70.2023.04.10.11.21.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Apr 2023 11:21:19 -0700 (PDT) From: Warner Losh To: qemu-devel@nongnu.org Cc: jrtc27@jrtc27.com, riastradh@netbsd.org, Kyle Evans , Ryo ONODERA , Brad Smith , Warner Losh , reinoud@netbsd.org, Richard Henderson Subject: [PATCH v2 16/19] bsd-user: Implement SIGSYS on arm Date: Mon, 10 Apr 2023 12:20:53 -0600 Message-Id: <20230410182056.320-17-imp@bsdimp.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230410182056.320-1-imp@bsdimp.com> References: <20230410182056.320-1-imp@bsdimp.com> MIME-Version: 1.0 Received-SPF: none client-ip=2607:f8b0:4864:20::12b; envelope-from=imp@bsdimp.com; helo=mail-il1-x12b.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_NONE=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org When a system call returns ENOSYS, send a SIGSYS to the process (to generate a core dump). Signed-off-by: Warner Losh Reviewed-by: Richard Henderson --- bsd-user/arm/target_arch_cpu.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/bsd-user/arm/target_arch_cpu.h b/bsd-user/arm/target_arch_cpu.h index 517d0087644..c4b21fef713 100644 --- a/bsd-user/arm/target_arch_cpu.h +++ b/bsd-user/arm/target_arch_cpu.h @@ -127,6 +127,14 @@ static inline void target_cpu_loop(CPUARMState *env) env->regs[15] -= env->thumb ? 2 : 4; break; } + /* + * Emulate BSD's sigsys behavior on unimplemented system calls. + * XXX may need to gate this somehow or arrange for sigsys to be + * masked in some use cases. + */ + if (ret == -TARGET_ENOSYS) { + force_sig_fault(TARGET_SIGSYS, SI_KERNEL, env->regs[15]); + } if ((unsigned int)ret >= (unsigned int)(-515)) { ret = -ret; cpsr_write(env, CPSR_C, CPSR_C, CPSRWriteByInstr);