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