lib/libc/i386/gen/setjmp.s

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * 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    5.1 (Berkeley) 4/23/90"
        .align  2,0x90
#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 environment 'a'.
 * The previous signal state is restored.
 */

#include "DEFS.h"
#include "SYS.h"

ENTRY(setjmp)
        pushl   $0
        call    PIC_PLT(_sigblock)
        popl    %edx
        movl    4(%esp),%ecx
        movl    0(%esp),%edx
        movl    %edx, 0(%ecx)
        movl    %ebx, 4(%ecx)
        movl    %esp, 8(%ecx)
        movl    %ebp,12(%ecx)
        movl    %esi,16(%ecx)
        movl    %edi,20(%ecx)
        movl    %eax,24(%ecx)
        fnstcw  28(%ecx)
        xorl    %eax,%eax
        ret

ENTRY(longjmp)
        movl    4(%esp),%edx
        pushl   24(%edx)
        call    PIC_PLT(_sigsetmask)    /* XXX this is not reentrant */
        popl    %eax
        movl    4(%esp),%edx
        movl    8(%esp),%eax
        movl    0(%edx),%ecx
        movl    4(%edx),%ebx
        movl    8(%edx),%esp
        movl    12(%edx),%ebp
        movl    16(%edx),%esi
        movl    20(%edx),%edi
        fninit
        fldcw   28(%edx)
        testl   %eax,%eax
        jnz     1f
        incl    %eax
1:      movl    %ecx,0(%esp)
        ret