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Annotation of sys/lib/libkern/arch/i386/setjmp.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: setjmp.S,v 1.3 2003/06/02 23:28:08 millert Exp $      */
                      2: /*     $NetBSD: setjmp.S,v 1.5 1994/10/26 06:39:14 cgd Exp $   */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1990 The Regents of the University of California.
                      6:  * All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to Berkeley by
                      9:  * William Jolitz.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  *
                     35:  *     @(#)setjmp.s    5.1 (Berkeley) 4/23/90
                     36:  */
                     37:
                     38: /*
                     39:  * C library -- _setjmp, _longjmp
                     40:  *
                     41:  *     longjmp(a,v)
                     42:  * will generate a "return(v)" from the last call to
                     43:  *     setjmp(a)
                     44:  * by restoring registers from the stack.
                     45:  * The previous signal state is restored.
                     46:  */
                     47:
                     48: #include "DEFS.h"
                     49: #include "SYS.h"
                     50:
                     51: ENTRY(setjmp)
                     52:        pushl   $0
                     53:        call    PIC_PLT(_sigblock)
                     54:        popl    %edx
                     55:        movl    4(%esp),%ecx
                     56:        movl    0(%esp),%edx
                     57:        movl    %edx, 0(%ecx)
                     58:        movl    %ebx, 4(%ecx)
                     59:        movl    %esp, 8(%ecx)
                     60:        movl    %ebp,12(%ecx)
                     61:        movl    %esi,16(%ecx)
                     62:        movl    %edi,20(%ecx)
                     63:        movl    %eax,24(%ecx)
                     64:        xorl    %eax,%eax
                     65:        ret
                     66:
                     67: ENTRY(longjmp)
                     68:        movl    4(%esp),%edx
                     69:        pushl   24(%edx)
                     70:        call    PIC_PLT(_sigsetmask)
                     71:        popl    %eax
                     72:        movl    4(%esp),%edx
                     73:        movl    8(%esp),%eax
                     74:        movl    0(%edx),%ecx
                     75:        movl    4(%edx),%ebx
                     76:        movl    8(%edx),%esp
                     77:        movl    12(%edx),%ebp
                     78:        movl    16(%edx),%esi
                     79:        movl    20(%edx),%edi
                     80:        testl   %eax,%eax
                     81:        jnz     1f
                     82:        incl    %eax
                     83: 1:     movl    %ecx,0(%esp)
                     84:        ret