1c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes/* 2c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * Copyright (C) 2013 The Android Open Source Project 3c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * All rights reserved. 4c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * 5c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * Redistribution and use in source and binary forms, with or without 6c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * modification, are permitted provided that the following conditions 7c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * are met: 8c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * * Redistributions of source code must retain the above copyright 9c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * notice, this list of conditions and the following disclaimer. 10c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * * Redistributions in binary form must reproduce the above copyright 11c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * notice, this list of conditions and the following disclaimer in 12c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * the documentation and/or other materials provided with the 13c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * distribution. 14c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * 15c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes * SUCH DAMAGE. 27c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes */ 28c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes 29c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes#include <signal.h> 30c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes 3136f451a6d93b6807944d99fa23396e039c47e845Elliott Hughesextern "C" void __restore_rt(void); 3236f451a6d93b6807944d99fa23396e039c47e845Elliott Hughesextern "C" void __restore(void); 3336f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes 341cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes#if defined(__LP64__) 351cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes 36c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughesextern "C" int __rt_sigaction(int, const struct __kernel_sigaction*, struct __kernel_sigaction*, size_t); 37c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes 38c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughesint sigaction(int signal, const struct sigaction* bionic_new_action, struct sigaction* bionic_old_action) { 39c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes __kernel_sigaction kernel_new_action; 40c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes if (bionic_new_action != NULL) { 41c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes kernel_new_action.sa_flags = bionic_new_action->sa_flags; 42c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes kernel_new_action.sa_handler = bionic_new_action->sa_handler; 43c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes kernel_new_action.sa_mask = bionic_new_action->sa_mask; 441cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes#if defined(SA_RESTORER) 45c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes kernel_new_action.sa_restorer = bionic_new_action->sa_restorer; 461cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes#if defined(__aarch64__) 471cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes // arm64 has sa_restorer, but unwinding works best if you just let the 481cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes // kernel supply the default restorer from [vdso]. gdb doesn't care, but 491cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes // libgcc needs the nop that the kernel includes before the actual code. 501cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes // (We could add that ourselves, but why bother?) 511cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes#else 52c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes if (!(kernel_new_action.sa_flags & SA_RESTORER)) { 53c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes kernel_new_action.sa_flags |= SA_RESTORER; 5436f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes kernel_new_action.sa_restorer = &__restore_rt; 55c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes } 5646f3db6bb81b3368783ea3748df46c2d7d2f7b2fChris Dearman#endif 571cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes#endif 58c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes } 59c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes 60c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes __kernel_sigaction kernel_old_action; 61c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes int result = __rt_sigaction(signal, 62c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes (bionic_new_action != NULL) ? &kernel_new_action : NULL, 63c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes (bionic_old_action != NULL) ? &kernel_old_action : NULL, 64c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes sizeof(sigset_t)); 65c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes 66c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes if (bionic_old_action != NULL) { 67c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes bionic_old_action->sa_flags = kernel_old_action.sa_flags; 68c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes bionic_old_action->sa_handler = kernel_old_action.sa_handler; 69c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes bionic_old_action->sa_mask = kernel_old_action.sa_mask; 701cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes#if defined(SA_RESTORER) 71c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes bionic_old_action->sa_restorer = kernel_old_action.sa_restorer; 7246f3db6bb81b3368783ea3748df46c2d7d2f7b2fChris Dearman#endif 73c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes } 74c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes 75c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes return result; 761cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes} 771cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes 78c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes#else 791cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes 801cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughesextern "C" int __sigaction(int, const struct sigaction*, struct sigaction*); 811cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes 821cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughesint sigaction(int signal, const struct sigaction* bionic_new_action, struct sigaction* bionic_old_action) { 831cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes // The 32-bit ABI is broken. struct sigaction includes a too-small sigset_t, 841cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes // so we have to use sigaction(2) rather than rt_sigaction(2). 8536f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes struct sigaction kernel_new_action; 8636f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes if (bionic_new_action != NULL) { 8736f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes kernel_new_action.sa_flags = bionic_new_action->sa_flags; 8836f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes kernel_new_action.sa_handler = bionic_new_action->sa_handler; 8936f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes kernel_new_action.sa_mask = bionic_new_action->sa_mask; 901cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes#if defined(SA_RESTORER) 9136f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes kernel_new_action.sa_restorer = bionic_new_action->sa_restorer; 9236f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes 9336f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes if (!(kernel_new_action.sa_flags & SA_RESTORER)) { 9436f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes kernel_new_action.sa_flags |= SA_RESTORER; 9536f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes kernel_new_action.sa_restorer = (kernel_new_action.sa_flags & SA_SIGINFO) ? &__restore_rt : &__restore; 9636f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes } 9736f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes#endif 9836f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes } 9936f451a6d93b6807944d99fa23396e039c47e845Elliott Hughes return __sigaction(signal, (bionic_new_action != NULL) ? &kernel_new_action : NULL, bionic_old_action); 100c7e9b2331771e5e87c34a8ee3dc6cc41d35b02feElliott Hughes} 1011cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes 1021cff9a89645a8f362a9ce19c7f9544e98c1fd9e7Elliott Hughes#endif 103