glibc/sysdeps/m68k/bsd-_setjmp.S

/* BSD `_setjmp' entry point to `sigsetjmp (..., 0)'.  m68k version.
Copyright (C) 1994 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.  */

/* This just does a tail-call to `__sigsetjmp (ARG, 0)'.
   We cannot do it in C because it must be a tail-call, so frame-unwinding
   in setjmp doesn't clobber the state restored by longjmp.  */

#include <sysdep.h>

#ifdef MOTOROLA_SYNTAX
#define d0 %d0
#define d1 %d1
#define PUSH(reg)	move.l reg, -(%sp)
#define POP(reg)	move.l (%sp)+, reg
#define PUSH0		clr.l -(%sp)
#else
#define PUSH(reg)	movel reg, sp@-
#define POP(reg)	movel sp@+, reg
#define PUSH0		clrl sp@-
#endif

ENTRY (_setjmp)
	POP (d0)		/* Pop return PC.  */
	POP (d1)		/* Pop jmp_buf argument.  */
	PUSH0			/* Push second argument of zero.  */
	PUSH (d1)		/* Push back first argument.  */
	PUSH (d0)		/* Push back return PC.  */
#ifdef PIC
	bra.l C_SYMBOL_NAME (__sigsetjmp@PLTPC)
#else
	jmp C_SYMBOL_NAME (__sigsetjmp)
#endif
END (_setjmp)