sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c

   1 /* POSIX.1 sigaction call for Linux/SPARC64.
   2    Copyright (C) 1997,1998,1999,2000,2002,2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx) and
   5                   Jakub Jelinek (jj@ultra.linux.cz).
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include <string.h>
  23 #include <syscall.h>
  24 #include <sysdep.h>
  25 #include <sys/signal.h>
  26 #include <errno.h>
  27
  28 #include <kernel_sigaction.h>
  29
  30 /* SPARC 64bit userland requires a kernel that has rt signals anyway. */
  31
  32 static void __rt_sigreturn_stub (void);
  33
  34 int
  35 __libc_sigaction (int sig, __const struct sigaction *act,
  36                   struct sigaction *oact)
  37 {
  38   int ret;
  39   struct kernel_sigaction kact, koact;
  40   unsigned long stub = ((unsigned long) &__rt_sigreturn_stub) - 8;
  41
  42   if (act)
  43     {
  44       kact.k_sa_handler = act->sa_handler;
  45       memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
  46       kact.sa_flags = act->sa_flags;
  47       kact.sa_restorer = NULL;
  48     }
  49
  50   /* XXX The size argument hopefully will have to be changed to the
  51      real size of the user-level sigset_t.  */
  52   ret = INLINE_SYSCALL (rt_sigaction, 5, sig,
  53                         act ? __ptrvalue (&kact) : 0,
  54                         oact ? __ptrvalue (&koact) : 0, stub, _NSIG / 8);
  55
  56   if (oact && ret >= 0)
  57     {
  58       oact->sa_handler = koact.k_sa_handler;
  59       memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
  60       oact->sa_flags = koact.sa_flags;
  61       oact->sa_restorer = koact.sa_restorer;
  62     }
  63
  64   return ret;
  65 }
  66 libc_hidden_def (__libc_sigaction)
  67
  68 #ifndef LIBC_SIGACTION
  69 weak_alias (__libc_sigaction, __sigaction);
  70 libc_hidden_weak (__sigaction)
  71 weak_alias (__libc_sigaction, sigaction);
  72 #endif
  73
  74 static void
  75 __rt_sigreturn_stub (void)
  76 {
  77   __asm__ ("mov %0, %%g1\n\t"
  78            "ta  0x6d\n\t"
  79            : /* no outputs */
  80            : "i" (__NR_rt_sigreturn));
  81 }