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105 lines
2.5 KiB
105 lines
2.5 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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// features.h does not exist on macOS*
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#ifdef TARGET_LINUX
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// features initializes the system's state, including the state of __USE_GNU
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#include <features.h>
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#endif
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// If __USE_GNU is defined, we don't need to do anything.
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// If we defined it ourselves, we need to undefine it later.
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#ifndef __USE_GNU
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#define __USE_GNU
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#define APP_UNDEF_USE_GNU
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#endif
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#include <sys/ucontext.h>
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// If we defined __USE_GNU ourselves, we need to undefine it here.
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#ifdef APP_UNDEF_USE_GNU
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#undef __USE_GNU
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#undef APP_UNDEF_USE_GNU
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <assert.h>
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#include <setjmp.h>
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int p_safe_exit;
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void install_signal_handler(void);
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void signal_handler(int, siginfo_t *, void *);
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void generate_hlt_segv(int val);
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void install_signal_handler() {
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int ret_val;
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struct sigaction s_sigaction;
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struct sigaction *p_sigaction = &s_sigaction;
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/* Register the signal hander using the siginfo interface*/
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p_sigaction->sa_sigaction = signal_handler;
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p_sigaction->sa_flags = SA_SIGINFO;
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/* Don't mask any other signals */
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sigemptyset(&p_sigaction->sa_mask);
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ret_val = sigaction(SIGSEGV, p_sigaction, NULL);
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if(ret_val) {
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perror("ERROR, sigaction failed");
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exit(1);
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}
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}
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void generate_hlt_segv(int val) {
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int *p = 0;
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p_safe_exit = (int)&&safe_exit;
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printf("EIP of segfault: 0x%x (only accurate with if compiled with -O)\n", (int)&&hlt_segfault);
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hlt_segfault:
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__asm__ __volatile__ ("hlt");
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printf("ERROR!\n");
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safe_exit:
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printf("EIP of safe exit: 0x%x\n", p_safe_exit);
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}
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void signal_handler(int signum, siginfo_t *siginfo, void *_uctxt) {
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int ret_val;
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ucontext_t *uctxt = (ucontext_t *)_uctxt;
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ucontext_t signal_ctxt;
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#if defined(TARGET_MAC)
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printf("signal %d (captured EIP: 0x%x)\n", signum,
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uctxt->uc_mcontext->__ss.__eip);
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uctxt->uc_mcontext->__ss.__eip = p_safe_exit;
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#else
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printf("signal %d (captured EIP: 0x%x)\n", signum,
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uctxt->uc_mcontext.gregs[REG_EIP]);
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uctxt->uc_mcontext.gregs[REG_EIP] = p_safe_exit;
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#endif
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}
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int main(int argc, char **argv) {
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install_signal_handler();
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generate_hlt_segv(1);
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return 0;
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}
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