arch/um/sys-i386/stub_segv.c

   1 /*
   2  * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <signal.h>
   7 #include <asm/sigcontext.h>
   8 #include <asm/unistd.h>
   9 #include "uml-config.h"
  10 #include "sysdep/sigcontext.h"
  11 #include "sysdep/faultinfo.h"
  12
  13 void __attribute__ ((__section__ (".__syscall_stub")))
  14 stub_segv_handler(int sig)
  15 {
  16         struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
  17
  18         GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
  19                               sc);
  20
  21         __asm__("movl %0, %%eax ; int $0x80": : "g" (__NR_getpid));
  22         __asm__("movl %%eax, %%ebx ; movl %0, %%eax ; movl %1, %%ecx ;"
  23                 "int $0x80": : "g" (__NR_kill), "g" (SIGUSR1));
  24         /* Load pointer to sigcontext into esp, since we need to leave
  25          * the stack in its original form when we do the sigreturn here, by
  26          * hand.
  27          */
  28         __asm__("mov %0,%%esp ; movl %1, %%eax ; "
  29                 "int $0x80" : : "a" (sc), "g" (__NR_sigreturn));
  30 }