Add a sigaction implementation for sparc

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

libc/sysdeps/linux/sparc/Makefile.arch

@@ -5,7 +5,7 @@
 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 #
 
-CSRC := brk.c __syscall_error.c qp_ops.c
+CSRC := brk.c __syscall_error.c qp_ops.c sigaction.c
 
 SSRC := \
 	__longjmp.S fork.S vfork.S clone.S setjmp.S bsd-setjmp.S bsd-_setjmp.S \

libc/sysdeps/linux/sparc/sigaction.c

@@ -0,0 +1,94 @@
+/* POSIX.1 sigaction call for Linux/SPARC.
+   Copyright (C) 1997-2000,2002,2003,2005 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.
+
+       Ported to uClibc from glibc: 090520:
+               Jan Buchholz, KIP, Uni Heidelberg <jan.buchholz@kip.uni-heidelberg.de>
+               Austin Foxley, Ceton Corporation <austinf@cetoncorp.com>
+*/
+
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/syscall.h>
+#include <bits/kernel_sigaction.h>
+
+
+_syscall5(int, rt_sigaction, int, a, int, b, int, c, int, d, int, e);
+static void __rt_sigreturn_stub (void);
+static void __sigreturn_stub (void);
+
+int
+__libc_sigaction (int sig, __const struct sigaction *act, struct sigaction *oact)
+{
+    int ret;
+	struct old_kernel_sigaction kact, koact;
+    unsigned long stub = 0;
+    int saved_errno = errno;
+    
+    if (act)
+    {
+        kact.k_sa_handler = act->sa_handler;
+        memcpy (&kact.sa_mask, &act->sa_mask, sizeof(sigset_t));
+        if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO)!= 0)
+            stub = (unsigned long) &__rt_sigreturn_stub;
+        else
+            stub = (unsigned long) &__sigreturn_stub;
+        stub -= 8;
+        kact.sa_restorer = NULL;
+    }
+    /* XXX The size argument hopefully will have to be changed to the real size of the user-level sigset_t.  */
+    ret = rt_sigaction(sig, act ? &kact : NULL, oact ? &koact : NULL, stub, _NSIG / 8);
+
+    if (ret >= 0 || errno != ENOSYS)
+    {
+        if (oact && ret >= 0)
+        {
+            oact->sa_handler = koact.k_sa_handler;
+            memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
+            oact->sa_flags = koact.sa_flags;
+            oact->sa_restorer = koact.sa_restorer;
+        }
+        return ret;
+    }
+    __set_errno (saved_errno);
+    return -1;
+}
+
+#ifndef LIBC_SIGACTION
+weak_alias(__libc_sigaction,sigaction)
+libc_hidden_weak(sigaction)
+#endif
+
+static void
+__rt_sigreturn_stub (void)
+{
+  __asm__ ("mov %0, %%g1\n\t"
+          "ta  0x10\n\t"
+          : /* no outputs */
+          : "i" (__NR_rt_sigreturn));
+}
+static void
+__sigreturn_stub (void)
+{
+  __asm__ ("mov %0, %%g1\n\t"
+          "ta  0x10\n\t"
+          : /* no outputs */
+          : "i" (__NR_sigreturn));
+}