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 (at) 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 64 FUNCTION(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 76 FUNCTION(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 87 0: jmp *20(%ecx) /* done, return.... */ 88
