1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #pragma once 30 31 #include <sys/cdefs.h> 32 #include <sys/syscall.h> 33 #include <sys/types.h> 34 #include <unistd.h> 35 36 // An inline version of pthread_sigqueue(pthread_self(), ...), to reduce the number of 37 // uninteresting stack frames at the top of a crash. 38 static inline __always_inline void inline_raise(int sig, void* value = nullptr) { 39 // Protect ourselves against stale cached PID/TID values by fetching them via syscall. 40 // http://b/37769298 41 pid_t pid = syscall(__NR_getpid); 42 pid_t tid = syscall(__NR_gettid); 43 siginfo_t info = {}; 44 info.si_code = SI_QUEUE; 45 info.si_pid = pid; 46 info.si_uid = getuid(); 47 info.si_value.sival_ptr = value; 48 49 #if defined(__arm__) 50 register long r0 __asm__("r0") = pid; 51 register long r1 __asm__("r1") = tid; 52 register long r2 __asm__("r2") = sig; 53 register long r3 __asm__("r3") = reinterpret_cast<long>(&info); 54 register long r7 __asm__("r7") = __NR_rt_tgsigqueueinfo; 55 __asm__("swi #0" : "=r"(r0) : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r7) : "memory"); 56 #elif defined(__aarch64__) 57 register long x0 __asm__("x0") = pid; 58 register long x1 __asm__("x1") = tid; 59 register long x2 __asm__("x2") = sig; 60 register long x3 __asm__("x3") = reinterpret_cast<long>(&info); 61 register long x8 __asm__("x8") = __NR_rt_tgsigqueueinfo; 62 __asm__("svc #0" : "=r"(x0) : "r"(x0), "r"(x1), "r"(x2), "r"(x3), "r"(x8) : "memory"); 63 #else 64 syscall(__NR_rt_tgsigqueueinfo, pid, tid, sig, &info); 65 #endif 66 } 67 68