Initial revision

sysdeps/unix/bsd/sequent/i386/sigvec.S

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+/* 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 <sysdep.h>
+
+/* The Dynix `sigvec' system call takes an extra argument,
+   which is the address of the trampoline function.  */
+
+.text
+.align 4
+trampoline:
+	cld			/* Clear direction flag.  */
+	call %eax		/* Call the handler, address in %eax.  */
+	addl $8, %esp		/* Pop signum & code off the stack.  */
+	/* __sigreturn will restore the context, and never return here.  */
+	jsr C_SYMBOL_NAME (__sigreturn)
+
+.globl syscall_error
+ENTRY (__sigvec)
+	/* Put the address of the trampoline in a scratch register.  */
+	mov $trampoline, %edx
+	/* Now exchange this register with the top of the stack,
+	   wherein now lies the return PC.  */
+	xchg 0(%esp), %edx
+	mov %esp, %ecx 		/* Point the syscall at the arguments.  */
+	DO_CALL (sigvec, 4)	/* Do the system call.  */
+	/* Exchange again, restoring the return PC.  */
+	xchg 0(%esp), %edx
+	jb syscall_error	/* Check for error.  */
+	ret