usr/src/lib/libc/hp300/gen/_setjmp.s

/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
        .asciz "@(#)_setjmp.s   8.1 (Berkeley) 6/4/93"
#endif /* LIBC_SCCS and not lint */

/*
 * C library -- _setjmp, _longjmp
 *
 *      _longjmp(a,v)
 * will generate a "return(v)" from
 * the last call to
 *      _setjmp(a)
 * by restoring registers from the stack,
 * The previous signal state is NOT restored.
 */

#include "DEFS.h"

ENTRY(_setjmp)
        movl    sp@(4),a0       /* save area pointer */
        clrl    a0@+            /* no old onstack */
        clrl    a0@+            /* no old sigmask */
        movl    sp,a0@+         /* save old SP */
        movl    a6,a0@+         /* save old FP */
        clrl    a0@+            /* no old AP */
        movl    sp@,a0@+        /* save old PC */
        clrl    a0@+            /* clear PS */
        moveml  #0x3CFC,a0@     /* save other non-scratch regs */
        clrl    d0              /* return zero */
        rts

ENTRY(_longjmp)
        movl    sp@(4),a0       /* save area pointer */
        addql   #8,a0           /* skip onstack/sigmask */
        tstl    a0@             /* ensure non-zero SP */
        jeq     botch           /* oops! */
        movl    sp@(8),d0       /* grab return value */
        jne     ok              /* non-zero ok */
        moveq   #1,d0           /* else make non-zero */
ok:
        movl    a0@+,sp         /* restore SP */
        movl    a0@+,a6         /* restore FP */
        addql   #4,a0           /* skip AP */
        movl    a0@+,sp@        /* restore PC */
        moveml  a0@(4),#0x3CFC  /* restore non-scratch regs */
        rts

botch:
        jsr     _longjmperror
        stop    #0