78 lines
3.2 KiB
C
78 lines
3.2 KiB
C
/*
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* Copyright (C) 2018 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <sys/cdefs.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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// An inline version of pthread_sigqueue(pthread_self(), ...), to reduce the number of
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// uninteresting stack frames at the top of a crash.
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static inline __always_inline void inline_raise(int sig, void* value = nullptr) {
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// Protect ourselves against stale cached PID/TID values by fetching them via syscall.
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// http://b/37769298
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pid_t pid = syscall(__NR_getpid);
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pid_t tid = syscall(__NR_gettid);
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siginfo_t info = {};
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info.si_code = SI_QUEUE;
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info.si_pid = pid;
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info.si_uid = getuid();
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info.si_value.sival_ptr = value;
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#if defined(__arm__)
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register long r0 __asm__("r0") = pid;
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register long r1 __asm__("r1") = tid;
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register long r2 __asm__("r2") = sig;
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register long r3 __asm__("r3") = reinterpret_cast<long>(&info);
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register long r7 __asm__("r7") = __NR_rt_tgsigqueueinfo;
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__asm__("swi #0" : "=r"(r0) : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r7) : "memory");
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#elif defined(__aarch64__)
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register long x0 __asm__("x0") = pid;
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register long x1 __asm__("x1") = tid;
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register long x2 __asm__("x2") = sig;
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register long x3 __asm__("x3") = reinterpret_cast<long>(&info);
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register long x8 __asm__("x8") = __NR_rt_tgsigqueueinfo;
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__asm__("svc #0" : "=r"(x0) : "r"(x0), "r"(x1), "r"(x2), "r"(x3), "r"(x8) : "memory");
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#elif defined(__x86_64__)
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register long rax __asm__("rax") = __NR_rt_tgsigqueueinfo;
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register long rdi __asm__("rdi") = pid;
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register long rsi __asm__("rsi") = tid;
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register long rdx __asm__("rdx") = sig;
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register long r10 __asm__("r10") = reinterpret_cast<long>(&info);
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__asm__("syscall"
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: "+r"(rax)
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: "r"(rdi), "r"(rsi), "r"(rdx), "r"(r10)
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: "memory", "cc", "r11", "rcx");
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#else
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// 32-bit x86 is a huge mess, so don't even bother...
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syscall(__NR_rt_tgsigqueueinfo, pid, tid, sig, &info);
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#endif
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}
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