stub_segv.c 889 B

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  1. /*
  2. * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
  3. * Licensed under the GPL
  4. */
  5. #include <signal.h>
  6. #include <sys/select.h> /* The only way I can see to get sigset_t */
  7. #include <asm/unistd.h>
  8. #include "uml-config.h"
  9. #include "sysdep/stub.h"
  10. #include "sysdep/sigcontext.h"
  11. #include "sysdep/faultinfo.h"
  12. void __attribute__ ((__section__ (".__syscall_stub")))
  13. stub_segv_handler(int sig)
  14. {
  15. struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
  16. int pid;
  17. GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
  18. sc);
  19. pid = stub_syscall0(__NR_getpid);
  20. stub_syscall2(__NR_kill, pid, SIGUSR1);
  21. /* Load pointer to sigcontext into esp, since we need to leave
  22. * the stack in its original form when we do the sigreturn here, by
  23. * hand.
  24. */
  25. __asm__ __volatile__("mov %0,%%esp ; movl %1, %%eax ; "
  26. "int $0x80" : : "a" (sc), "g" (__NR_sigreturn));
  27. }