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-rw-r--r--sysdeps/unix/sysv/linux/sparc/sigaction.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sparc/sigaction.c b/sysdeps/unix/sysv/linux/sparc/sigaction.c
new file mode 100644
index 0000000000..e7bda77de2
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sparc/sigaction.c
@@ -0,0 +1,127 @@
+/* POSIX.1 sigaction call for Linux/SPARC.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx), 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <syscall.h>
+#include <sys/signal.h>
+#include <errno.h>
+
+/* The kernel will deliver signals in the old way if the signal
+   number is a positive number.  The kernel will deliver a signal
+   with the new stack layout if the signal number is a negative number.
+
+   Our sigaction code takes care of selecting the type of kernel we are
+   using at runtime.  */
+
+extern void ____sparc_signal_trampoline (int);
+long ____sig_table [NSIG];
+
+int
+__trampoline_sigaction (int sig, struct sigaction *new, struct sigaction *old)
+{
+  int ret;
+  int need_to_hide_trick = 0;
+  __sighandler_t old_sh;
+
+  if (new)
+    {
+      if (new->sa_handler != SIG_DFL && new->sa_handler != SIG_IGN)
+	{
+	  old_sh = ____sig_table[sig];
+	  ____sig_table[sig] = (long int) new->sa_handler;
+	  new->sa_handler = ____sparc_signal_trampoline;
+	  need_to_hide_trick = 1;
+	}
+    }
+  __asm__("or %%g0,%0,%%g1\n\t"
+	  "or %%g0,%1,%%o0\n\t"
+	  "or %%g0,%2,%%o1\n\t"
+	  "or %%g0,%3,%%o2\n\t"
+	  "t  0x10\n\t"
+	  "bcc 1f\n\t"
+	  "or %%o0, %%g0, %0\n\t"
+	  "sub %%g0, %%o0, %0\n\t"
+	  "1:"
+	  : "=r" (ret), "=r" ((long int) sig), "=r" ((long int) new),
+	    "=r" ((long int) old)
+	  : "0" (SYS_sigaction), "1" (sig), "2" (new), "3" (old)
+	  : "g1", "o0", "o1", "o2");
+
+  if (ret >= 0)
+    {
+      if (old && old->sa_handler == ____sparc_signal_trampoline)
+	{
+	  if (need_to_hide_trick)
+	    old->sa_handler = old_sh;
+	  else
+	    old->sa_handler = ____sig_table[sig];
+	}
+      if (need_to_hide_trick)
+	new->sa_handler = ____sig_table[sig];
+      return 0;
+    }
+  __set_errno (-ret);
+  return -1;
+}
+
+int
+__new_sigaction (int sig, struct sigaction *new, struct sigaction *old)
+{
+  int ret;
+
+  sig = -sig;
+
+  __asm__("or %%g0,%0,%%g1\n\t"
+	  "or %%g0,%1,%%o0\n\t"
+	  "or %%g0,%2,%%o1\n\t"
+	  "or %%g0,%3,%%o2\n\t"
+	  "t  0x10\n\t"
+	  "bcc 1f\n\t"
+	  "or %%o0, %%g0, %0\n\t"
+	  "sub %%g0,%%o0,%0\n\t"
+	  "1:"
+	  : "=r" (ret), "=r" ((long int) sig), "=r" ((long int) new),
+	    "=r" ((long int) old)
+	  : "0" (SYS_sigaction), "1" (sig), "2" (new), "3" (old)
+	  : "g1", "o0", "o1", "o2");
+  if (ret >= 0)
+    return 0;
+  __set_errno (-ret);
+  return -1;
+}
+
+int
+__sigaction (int sig, struct sigaction *new, struct sigaction *old)
+{
+  static (*sigact_routine) (int, struct sigaction *, struct sigaction *);
+  int ret;
+  struct sigaction sa;
+
+  if (sigact_routine)
+    return (*sigact_routine) (sig, new, old);
+
+  ret = __new_sigaction (1, NULL, &sa);
+  if (ret == -1)
+    sigact_routine = __trampoline_sigaction;
+  else
+    sigact_routine = __new_sigaction;
+
+  return __sigaction (sig, new, old);
+}
+weak_alias (__sigaction, sigaction);