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

   1 /* POSIX.1 sigaction call for Linux/SPARC64.
   2    Copyright (C) 1997-2017 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, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <string.h>
  22 #include <syscall.h>
  23 #include <sysdep.h>
  24 #include <sys/signal.h>
  25 #include <errno.h>
  26
  27 #include <kernel_sigaction.h>
  28
  29 /* SPARC 64bit userland requires a kernel that has rt signals anyway. */
  30
  31 static void __rt_sigreturn_stub (void);
  32
  33 int
  34 __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  35 {
  36   int ret;
  37   struct kernel_sigaction kact, koact;
  38   unsigned long stub = ((unsigned long) &__rt_sigreturn_stub) - 8;
  39
  40   if (act)
  41     {
  42       kact.k_sa_handler = act->sa_handler;
  43       memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
  44       kact.sa_flags = act->sa_flags;
  45       kact.sa_restorer = NULL;
  46     }
  47
  48   /* XXX The size argument hopefully will have to be changed to the
  49      real size of the user-level sigset_t.  */
  50   ret = INLINE_SYSCALL (rt_sigaction, 5, sig,
  51                         act ? &kact : 0,
  52                         oact ? &koact : 0, stub, _NSIG / 8);
  53
  54   if (oact && ret >= 0)
  55     {
  56       oact->sa_handler = koact.k_sa_handler;
  57       memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
  58       oact->sa_flags = koact.sa_flags;
  59       oact->sa_restorer = koact.sa_restorer;
  60     }
  61
  62   return ret;
  63 }
  64 libc_hidden_def (__libc_sigaction)
  65
  66 #include <nptl/sigaction.c>
  67
  68
  69 static
  70 inhibit_stack_protector
  71 void
  72 __rt_sigreturn_stub (void)
  73 {
  74   __asm__ ("mov %0, %%g1\n\t"
  75            "ta  0x6d\n\t"
  76            : /* no outputs */
  77            : "i" (__NR_rt_sigreturn));
  78 }