release/src-rt-6.x/linux/linux-2.6/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 <sys/select.h> /* The only way I can see to get sigset_t */
   8 #include <asm/unistd.h>
   9 #include "uml-config.h"
  10 #include "sysdep/stub.h"
  11 #include "sysdep/sigcontext.h"
  12 #include "sysdep/faultinfo.h"
  13
  14 void __attribute__ ((__section__ (".__syscall_stub")))
  15 stub_segv_handler(int sig)
  16 {
  17         struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
  18         int pid;
  19
  20         GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
  21                               sc);
  22
  23         pid = stub_syscall0(__NR_getpid);
  24         stub_syscall2(__NR_kill, pid, SIGUSR1);
  25
  26         /* Load pointer to sigcontext into esp, since we need to leave
  27          * the stack in its original form when we do the sigreturn here, by
  28          * hand.
  29          */
  30         __asm__ __volatile__("mov %0,%%esp ; movl %1, %%eax ; "
  31                              "int $0x80" : : "a" (sc), "g" (__NR_sigreturn));
  32 }