From 6e1bdbcff12ed24150748d47594e4102da8909a8 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Fri, 26 Mar 1993 21:04:06 +0000
Subject: [PATCH] Initial revision

---
 sysdeps/unix/bsd/sun/m68k/sigtramp.c | 164 +++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 sysdeps/unix/bsd/sun/m68k/sigtramp.c

diff --git a/sysdeps/unix/bsd/sun/m68k/sigtramp.c b/sysdeps/unix/bsd/sun/m68k/sigtramp.c
new file mode 100644
index 0000000..7b10a9f
--- /dev/null
+++ b/sysdeps/unix/bsd/sun/m68k/sigtramp.c
@@ -0,0 +1,164 @@
+/* Copyright (C) 1993 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+
+#ifndef	__GNUC__
+  #error This file uses GNU C extensions; you must compile with GCC.
+#endif
+
+/* Get the definition of `struct sigcontext'.  */
+#define	KERNEL
+#define	sigvec		sun_sigvec
+#define	sigstack	sun_sigstack
+#define	sigcontext	sun_sigcontext
+#include "/usr/include/sys/signal.h"
+#undef	sigvec
+#undef	sigstack
+#undef	sigcontext
+#undef	NSIG
+#undef	SIGABRT
+#undef	SIGCLD
+#undef	SV_ONSTACK
+#undef	SV_RESETHAND
+#undef	SV_INTERRUPT
+#undef	SA_ONSTACK
+#undef	SA_NOCLDSTOP
+#undef	SIG_ERR
+#undef	SIG_DFL
+#undef	SIG_IGN
+#undef	sigmask
+#undef	SIG_BLOCK
+#undef	SIG_UNBLOCK
+#undef	SIG_SETMASK
+
+#include <signal.h>
+#include <stddef.h>
+#include <errno.h>
+
+/* Defined in __sigvec.S.  */
+extern int EXFUN(__raw_sigvec, (int sig, CONST struct sigvec *vec,
+				struct sigvec *ovec));
+
+/* User-specified signal handlers.  */
+#define mytramp 1
+#ifdef mytramp
+static __sighandler_t handlers[NSIG];
+#else
+#define handlers _sigfunc
+extern __sighandler_t _sigfunc[];
+#endif
+
+#if mytramp
+
+/* Handler for all signals that are handled by a user-specified function.
+   Saves and restores the general regs %g2-%g7, the %y register, and
+   all the FPU regs (including %fsr), around calling the user's handler.  */
+static void
+DEFUN(trampoline, (sig, code, context, addr),
+      int sig AND int code AND struct sigcontext *context AND PTR addr)
+{
+  register int a0 asm("%a0");
+  register int a1 asm("%a1");
+  register int d0 asm("%d0");
+  register int d1 asm("%d1");
+
+  int savea[2], saved[2];
+
+  double fpsave[16];
+  int fsr;
+  int savefpu;
+
+  /* Save the call-clobbered registers.  */
+  savea[0] = a0;
+  savea[1] = a1;
+  saved[0] = d0;
+  saved[1] = d1;
+
+#if 0
+  /* Save the FPU regs if the FPU enable bit is set in the PSR,
+     and the signal isn't an FP exception.  */
+  savefpu = (context->sc_psr & 0x1000) && sig != SIGFPE;
+  if (savefpu)
+#endif
+
+  /* Call the user's handler.  */
+  (*((void EXFUN((*), (int sig, int code, struct sigcontext *context,
+		       PTR addr))) handlers[sig]))
+    (sig, code, context, addr);
+
+  /* Restore the call-clobbered registers.  */
+  a0 = savea[0];
+  a1 = savea[1];
+  d0 = saved[0];
+  d1 = saved[1];
+
+#if 0
+  if (savefpu)
+    ;
+#endif
+}
+
+#endif
+
+int
+DEFUN(__sigvec, (sig, vec, ovec),
+      int sig AND CONST struct sigvec *vec AND struct sigvec *ovec)
+{
+#ifndef	mytramp
+  extern void _sigtramp (int);
+#define	trampoline	_sigtramp
+#endif
+  struct sigvec myvec;
+  int mask;
+  __sighandler_t ohandler;
+
+  if (sig <= 0 || sig >= NSIG)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  mask = __sigblock(sigmask(sig));
+
+  ohandler = handlers[sig];
+
+  if (vec != NULL &&
+      vec->sv_handler != SIG_IGN && vec->sv_handler != SIG_DFL)
+    {
+      handlers[sig] = vec->sv_handler;
+      myvec = *vec;
+      myvec.sv_handler = trampoline;
+      vec = &myvec;
+    }
+
+  if (__raw_sigvec(sig, vec, ovec) < 0)
+    {
+      int save = errno;
+      (void) __sigsetmask(mask);
+      errno = save;
+      return -1;
+    }
+
+  if (ovec != NULL && ovec->sv_handler == trampoline)
+    ovec->sv_handler = ohandler;
+
+  (void) __sigsetmask(mask);
+
+  return 0;
+}
-- 
2.7.4