111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <jni.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ucontext.h>
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#include <unistd.h>
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#include "base/macros.h"
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static int signal_count;
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static const int kMaxSignal = 2;
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#if defined(__i386__) || defined(__x86_64__)
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#if defined(__APPLE__)
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#define ucontext __darwin_ucontext
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#if defined(__x86_64__)
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// 64 bit mac build.
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#define CTX_EIP uc_mcontext->__ss.__rip
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#else
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// 32 bit mac build.
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#define CTX_EIP uc_mcontext->__ss.__eip
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#endif
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#elif defined(__x86_64__)
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// 64 bit linux build.
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#define CTX_EIP uc_mcontext.gregs[REG_RIP]
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#else
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// 32 bit linux build.
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#define CTX_EIP uc_mcontext.gregs[REG_EIP]
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#endif
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#endif
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static void signalhandler(int sig ATTRIBUTE_UNUSED, siginfo_t* info ATTRIBUTE_UNUSED,
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void* context) {
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printf("signal caught\n");
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++signal_count;
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if (signal_count > kMaxSignal) {
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abort();
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}
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#if defined(__arm__)
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struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
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struct sigcontext *sc = reinterpret_cast<struct sigcontext*>(&uc->uc_mcontext);
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sc->arm_pc += 2; // Skip instruction causing segv.
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#elif defined(__aarch64__)
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struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
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struct sigcontext *sc = reinterpret_cast<struct sigcontext*>(&uc->uc_mcontext);
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sc->pc += 4; // Skip instruction causing segv.
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#elif defined(__i386__)
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struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
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uc->CTX_EIP += 3;
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#elif defined(__x86_64__)
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struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
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uc->CTX_EIP += 2;
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#else
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UNUSED(context);
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#endif
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}
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static struct sigaction oldaction;
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extern "C" JNIEXPORT void JNICALL Java_Main_initSignalTest(JNIEnv*, jclass) {
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struct sigaction action;
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action.sa_sigaction = signalhandler;
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sigemptyset(&action.sa_mask);
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action.sa_flags = SA_SIGINFO | SA_ONSTACK;
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#if !defined(__APPLE__) && !defined(__mips__)
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action.sa_restorer = nullptr;
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#endif
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sigaction(SIGSEGV, &action, &oldaction);
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}
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extern "C" JNIEXPORT void JNICALL Java_Main_terminateSignalTest(JNIEnv*, jclass) {
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sigaction(SIGSEGV, &oldaction, nullptr);
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}
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// Prevent the compiler being a smart-alec and optimizing out the assignment
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// to null.
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char *go_away_compiler = nullptr;
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extern "C" JNIEXPORT jint JNICALL Java_Main_testSignal(JNIEnv*, jclass) {
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#if defined(__arm__) || defined(__i386__) || defined(__aarch64__)
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// On supported architectures we cause a real SEGV.
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*go_away_compiler = 'a';
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#elif defined(__x86_64__)
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// Cause a SEGV using an instruction known to be 2 bytes long to account for hardcoded jump
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// in the signal handler
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asm volatile("movl $0, %%eax;" "movb %%ah, (%%rax);" : : : "%eax");
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#else
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// On other architectures we simulate SEGV.
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kill(getpid(), SIGSEGV);
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#endif
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return 1234;
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}
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