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stub_segv.c

/*
 * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
 * Licensed under the GPL
 */

#include <signal.h>
#include <sys/select.h> /* The only way I can see to get sigset_t */
#include <asm/unistd.h>
#include "as-layout.h"
#include "uml-config.h"
#include "sysdep/stub.h"
#include "sysdep/sigcontext.h"
#include "sysdep/faultinfo.h"

void __attribute__ ((__section__ (".__syscall_stub")))
stub_segv_handler(int sig)
{
      struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
      int pid;

      GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA), sc);

      pid = stub_syscall0(__NR_getpid);
      stub_syscall2(__NR_kill, pid, SIGUSR1);

      /* Load pointer to sigcontext into esp, since we need to leave
       * the stack in its original form when we do the sigreturn here, by
       * hand.
       */
      __asm__ __volatile__("mov %0,%%esp ; movl %1, %%eax ; "
                       "int $0x80" : : "a" (sc), "g" (__NR_sigreturn));
}

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