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, write to the Free Software 17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 */ 19 20 /* This is stolen from libc/x86/setjmp.S in the OSKit */ 21 /* 22 * Mach Operating System 23 * Copyright (c) 1991,1990,1989 Carnegie Mellon University 24 * All Rights Reserved. 25 * 26 * Permission to use, copy, modify and distribute this software and its 27 * documentation is hereby granted, provided that both the copyright 28 * notice and this permission notice appear in all copies of the 29 * software, derivative works or modified versions, and any portions 30 * thereof, and that both notices appear in supporting documentation. 31 * 32 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 33 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 34 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 35 * 36 * Carnegie Mellon requests users of this software to return to 37 * 38 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 39 * School of Computer Science 40 * Carnegie Mellon University 41 * Pittsburgh PA 15213-3890 42 * 43 * any improvements or extensions that they make and grant Carnegie Mellon 44 * the rights to redistribute these changes. 45 */ 46 /* 47 * C library -- _setjmp, _longjmp 48 * 49 * _longjmp(a,v) 50 * will generate a "return(v)" from 51 * the last call to 52 * _setjmp(a) 53 * by restoring registers from the stack, 54 * The previous signal state is NOT restored. 55 * 56 */ 57 58 ENTRY(grub_setjmp) 59 movl 4(%esp), %ecx /* fetch buffer */ 60 movl %ebx, 0(%ecx) 61 movl %esi, 4(%ecx) 62 movl %edi, 8(%ecx) 63 movl %ebp, 12(%ecx) /* save frame pointer of caller */ 64 popl %edx 65 movl %esp, 16(%ecx) /* save stack pointer of caller */ 66 movl %edx, 20(%ecx) /* save pc of caller */ 67 xorl %eax, %eax 68 jmp *%edx 69 70 ENTRY(grub_longjmp) 71 movl 8(%esp), %eax /* return(v) */ 72 movl 4(%esp), %ecx /* fetch buffer */ 73 movl 0(%ecx), %ebx 74 movl 4(%ecx), %esi 75 movl 8(%ecx), %edi 76 movl 12(%ecx), %ebp 77 movl 16(%ecx), %esp 78 orl %eax, %eax 79 jnz 0f 80 incl %eax 81 0: jmp *20(%ecx) /* done, return.... */ 82
