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#include <sys/ucontext.h>
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static char* rip_at_sig = NULL;
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static void int_handler(int signum, siginfo_t *si, void *uc_arg)
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ucontext_t *uc = (ucontext_t *)uc_arg;
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/* Note that uc->uc_mcontext is an embedded struct, not a pointer */
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mcontext_t *mc = &(uc->uc_mcontext);
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void *pc = (void*)mc->gregs[REG_RIP];
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printf("in int_handler, RIP is ...\n");
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static void register_handler(int sig, void *handler)
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sa.sa_flags = SA_RESTART | SA_SIGINFO;
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sigfillset(&sa.sa_mask);
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sa.sa_sigaction = handler;
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sigaction(sig, &sa, NULL);
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register_handler(SIGTRAP, int_handler);
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"movabsq $zz_int, %%rdx\n"
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: "m" (intaddr) /* input: address of var to store target addr to */
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: /* clobbers */ "rdx"
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/* intaddr is the address of the int 3 insn. rip_at_sig is the PC
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after the exception, which should be the next insn along.
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if (intaddr != NULL && rip_at_sig != NULL
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&& rip_at_sig == intaddr+1)