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Annotation of XNU/osfmk/i386/_setjmp.s, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /*
                     23:  * @OSF_COPYRIGHT@
                     24:  */
                     25: /* 
                     26:  * Mach Operating System
                     27:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
                     28:  * All Rights Reserved.
                     29:  * 
                     30:  * Permission to use, copy, modify and distribute this software and its
                     31:  * documentation is hereby granted, provided that both the copyright
                     32:  * notice and this permission notice appear in all copies of the
                     33:  * software, derivative works or modified versions, and any portions
                     34:  * thereof, and that both notices appear in supporting documentation.
                     35:  * 
                     36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     39:  * 
                     40:  * Carnegie Mellon requests users of this software to return to
                     41:  * 
                     42:  *  Software Distribution Coordinator  or  [email protected]
                     43:  *  School of Computer Science
                     44:  *  Carnegie Mellon University
                     45:  *  Pittsburgh PA 15213-3890
                     46:  * 
                     47:  * any improvements or extensions that they make and grant Carnegie Mellon
                     48:  * the rights to redistribute these changes.
                     49:  */
                     50: /*
                     51:  */
                     52: 
                     53: /*
                     54:  * C library -- _setjmp, _longjmp
                     55:  *
                     56:  *     _longjmp(a,v)
                     57:  * will generate a "return(v)" from
                     58:  * the last call to
                     59:  *     _setjmp(a)
                     60:  * by restoring registers from the stack,
                     61:  * The previous signal state is NOT restored.
                     62:  *
                     63:  */
                     64: 
                     65: #include <i386/asm.h>
                     66: 
                     67: ENTRY(_setjmp)
                     68:        movl    4(%esp),%ecx            # fetch buffer
                     69:        movl    %ebx,0(%ecx)
                     70:        movl    %esi,4(%ecx)
                     71:        movl    %edi,8(%ecx)
                     72:        movl    %ebp,12(%ecx)           # save frame pointer of caller
                     73:        popl    %edx
                     74:        movl    %esp,16(%ecx)           # save stack pointer of caller
                     75:        movl    %edx,20(%ecx)           # save pc of caller
                     76:        xorl    %eax,%eax
                     77:         jmp     *%edx
                     78: 
                     79: ENTRY(_longjmp)
                     80:        movl    8(%esp),%eax            # return(v)
                     81:        movl    4(%esp),%ecx            # fetch buffer
                     82:        movl    0(%ecx),%ebx
                     83:        movl    4(%ecx),%esi
                     84:        movl    8(%ecx),%edi
                     85:        movl    12(%ecx),%ebp
                     86:        movl    16(%ecx),%esp
                     87:        orl     %eax,%eax
                     88:        jnz     0f
                     89:        incl    %eax
                     90: 0:     jmp     *20(%ecx)               # done, return....

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