1 /* 2 * Copyright (c) 1985 Regents of the University of California. 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <signal.h> 31 #include <stdlib.h> 32 #include <sys/syscall.h> 33 #include <unistd.h> 34 35 // We call tgkill(2) directly instead of raise (or even the libc tgkill wrapper), to reduce the 36 // number of uninteresting stack frames at the top of a crash. 37 static inline __always_inline void inline_tgkill(pid_t pid, pid_t tid, int sig) { 38 #if defined(__arm__) 39 register int r0 __asm__("r0") = pid; 40 register int r1 __asm__("r1") = tid; 41 register int r2 __asm__("r2") = sig; 42 register int r7 __asm__("r7") = __NR_tgkill; 43 __asm__("swi #0" : "=r"(r0) : "r"(r0), "r"(r1), "r"(r2), "r"(r7) : "memory"); 44 #elif defined(__aarch64__) 45 register long x0 __asm__("x0") = pid; 46 register long x1 __asm__("x1") = tid; 47 register long x2 __asm__("x2") = sig; 48 register long x8 __asm__("x8") = __NR_tgkill; 49 __asm__("svc #0" : "=r"(x0) : "r"(x0), "r"(x1), "r"(x2), "r"(x8) : "memory"); 50 #else 51 syscall(__NR_tgkill, pid, tid, sig); 52 #endif 53 } 54 55 void abort() { 56 // Protect ourselves against stale cached PID/TID values by fetching them via syscall. 57 // http://b/37769298 58 pid_t pid = syscall(__NR_getpid); 59 pid_t tid = syscall(__NR_gettid); 60 61 // Don't block SIGABRT to give any signal handler a chance; we ignore 62 // any errors -- X311J doesn't allow abort to return anyway. 63 sigset64_t mask; 64 sigfillset64(&mask); 65 sigdelset64(&mask, SIGABRT); 66 67 sigprocmask64(SIG_SETMASK, &mask, nullptr); 68 inline_tgkill(pid, tid, SIGABRT); 69 70 // If SIGABRT is ignored or it's caught and the handler returns, 71 // remove the SIGABRT signal handler and raise SIGABRT again. 72 struct sigaction64 sa = { .sa_handler = SIG_DFL, .sa_flags = SA_RESTART }; 73 sigaction64(SIGABRT, &sa, nullptr); 74 75 sigprocmask64(SIG_SETMASK, &mask, nullptr); 76 inline_tgkill(pid, tid, SIGABRT); 77 78 // If we get this far, just exit. 79 _exit(127); 80 } 81
