1/*
2 *  GRUB  --  GRand Unified Bootloader
3 *  Copyright (C) 2000 Free Software Foundation, Inc.
4 *
5 *  This program is free software; you can redistribute it and/or modify
6 *  it under the terms of the GNU General Public License as published by
7 *  the Free Software Foundation; either version 2 of the License, or
8 *  (at your option) any later version.
9 *
10 *  This program is distributed in the hope that it will be useful,
11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 *  GNU General Public License for more details.
14 *
15 *  You should have received a copy of the GNU General Public License
16 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19/* This is stolen from libc/x86/setjmp.S in the OSKit */
20/*
21 * Mach Operating System
22 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
23 * All Rights Reserved.
24 *
25 * Permission to use, copy, modify and distribute this software and its
26 * documentation is hereby granted, provided that both the copyright
27 * notice and this permission notice appear in all copies of the
28 * software, derivative works or modified versions, and any portions
29 * thereof, and that both notices appear in supporting documentation.
30 *
31 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
32 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
33 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
34 *
35 * Carnegie Mellon requests users of this software to return to
36 *
37 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
38 *  School of Computer Science
39 *  Carnegie Mellon University
40 *  Pittsburgh PA 15213-3890
41 *
42 * any improvements or extensions that they make and grant Carnegie Mellon
43 * the rights to redistribute these changes.
44 */
45/*
46 * C library -- _setjmp, _longjmp
47 *
48 *      _longjmp(a,v)
49 * will generate a "return(v)" from
50 * the last call to
51 *      _setjmp(a)
52 * by restoring registers from the stack,
53 * The previous signal state is NOT restored.
54 *
55 */
56
57#define EXT_C(sym) sym
58#define FUNCTION(x)     .globl EXT_C(x) ; .type EXT_C(x), @function ; EXT_C(x):
59
60	.file	"setjmp.S"
61
62	.text
63
64FUNCTION(setjmp)
65	movl	4(%esp), %ecx		/* fetch buffer */
66	movl	%ebx, 0(%ecx)
67	movl	%esi, 4(%ecx)
68	movl	%edi, 8(%ecx)
69	movl	%ebp, 12(%ecx)		/* save frame pointer of caller */
70	popl	%edx
71	movl	%esp, 16(%ecx)		/* save stack pointer of caller */
72	movl	%edx, 20(%ecx)		/* save pc of caller */
73	xorl	%eax, %eax
74        jmp     *%edx
75
76FUNCTION(longjmp)
77	movl	8(%esp), %eax		/* return(v) */
78	movl	4(%esp), %ecx		/* fetch buffer */
79	movl	0(%ecx), %ebx
80	movl	4(%ecx), %esi
81	movl	8(%ecx), %edi
82	movl	12(%ecx), %ebp
83	movl	16(%ecx), %esp
84	orl	%eax, %eax
85	jnz	0f
86	incl	%eax
870:	jmp	*20(%ecx)		/* done, return.... */
88