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

   1 /* POSIX.1 sigaction call for Linux/SPARC.
   2    Copyright (C) 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx), 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <syscall.h>
  22 #include <sys/signal.h>
  23 #include <errno.h>
  24
  25 /* Commented out while I figure out what the fuck goes on */
  26 long ____sig_table [NSIG];
  27 #if 0
  28
  29 /* The kernel will deliver signals in the old way if the signal
  30    number is a positive number.  The kernel will deliver a signal
  31    with the new stack layout if the signal number is a negative number.
  32
  33    Our sigaction code takes care of selecting the type of kernel we are
  34    using at runtime.  */
  35
  36 extern void ____sparc_signal_trampoline (int);
  37
  38 int
  39 __trampoline_sigaction (int sig, struct sigaction *new, struct sigaction *old)
  40 {
  41   int ret;
  42   int need_to_hide_trick = 0;
  43   __sighandler_t old_sh;
  44
  45   if (new)
  46     {
  47       if (new->sa_handler != SIG_DFL && new->sa_handler != SIG_IGN)
  48         {
  49           old_sh = ____sig_table[sig];
  50           ____sig_table[sig] = (long int) new->sa_handler;
  51           new->sa_handler = ____sparc_signal_trampoline;
  52           need_to_hide_trick = 1;
  53         }
  54     }
  55   __asm__("or %%g0,%0,%%g1\n\t"
  56           "or %%g0,%1,%%o0\n\t"
  57           "or %%g0,%2,%%o1\n\t"
  58           "or %%g0,%3,%%o2\n\t"
  59           "t  0x10\n\t"
  60           "bcc 1f\n\t"
  61           "or %%o0, %%g0, %0\n\t"
  62           "sub %%g0, %%o0, %0\n\t"
  63           "1:"
  64           : "=r" (ret), "=r" ((long int) sig), "=r" ((long int) new),
  65             "=r" ((long int) old)
  66           : "0" (__NR_sigaction), "1" (sig), "2" (new), "3" (old)
  67           : "g1", "o0", "o1", "o2");
  68
  69   if (ret >= 0)
  70     {
  71       if (old && old->sa_handler == ____sparc_signal_trampoline)
  72         {
  73           if (need_to_hide_trick)
  74             old->sa_handler = old_sh;
  75           else
  76             old->sa_handler = ____sig_table[sig];
  77         }
  78       if (need_to_hide_trick)
  79         new->sa_handler = ____sig_table[sig];
  80       return 0;
  81     }
  82   __set_errno (-ret);
  83   return -1;
  84 }
  85 #else
  86 #    define __new_sigaction __sigaction
  87 #endif
  88
  89 int
  90 __new_sigaction (int sig, __const struct sigaction *new, struct sigaction *old)
  91 {
  92   int ret;
  93
  94   sig = -sig;
  95
  96   __asm__("or %%g0,%0,%%g1\n\t"
  97           "or %%g0,%1,%%o0\n\t"
  98           "or %%g0,%2,%%o1\n\t"
  99           "or %%g0,%3,%%o2\n\t"
 100           "t  0x10\n\t"
 101           "bcc 1f\n\t"
 102           "or %%o0, %%g0, %0\n\t"
 103           "sub %%g0,%%o0,%0\n\t"
 104           "1:"
 105           : "=r" (ret), "=r" ((long int) sig), "=r" ((long int) new),
 106             "=r" ((long int) old)
 107           : "0" (__NR_sigaction), "1" (sig), "2" (new), "3" (old)
 108           : "g1", "o0", "o1", "o2");
 109   if (ret >= 0)
 110     return 0;
 111   __set_errno (-ret);
 112   return -1;
 113 }
 114
 115 #if 0
 116 int
 117 __sigaction (int sig, __const struct sigaction *new, struct sigaction *old)
 118 {
 119   static (*sigact_routine) (int, __const struct sigaction *, struct sigaction *);
 120   int ret;
 121   struct sigaction sa;
 122
 123   if (sigact_routine)
 124     return (*sigact_routine) (sig, new, old);
 125
 126   ret = __new_sigaction (1, NULL, &sa);
 127   if (ret == -1)
 128     sigact_routine = __trampoline_sigaction;
 129   else
 130     sigact_routine = __new_sigaction;
 131
 132   return __sigaction (sig, new, old);
 133 }
 134 #endif
 135
 136 weak_alias (__sigaction, sigaction);