| 1 | /* |
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| 2 | * GRUB -- GRand Unified Bootloader |
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| 3 | * Copyright (C) 2000 Free Software Foundation, Inc. |
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| 4 | * |
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| 5 | * This program is free software; you can redistribute it and/or modify |
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| 6 | * it under the terms of the GNU General Public License as published by |
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| 7 | * the Free Software Foundation; either version 2 of the License, or |
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| 8 | * (at your option) any later version. |
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| 9 | * |
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| 10 | * This program is distributed in the hope that it will be useful, |
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | * GNU General Public License for more details. |
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| 14 | * |
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| 15 | * You should have received a copy of the GNU General Public License |
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| 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
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| 17 | */ |
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| 18 | |
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| 19 | /* This is stolen from libc/x86/setjmp.S in the OSKit */ |
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| 20 | /* |
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| 21 | * Mach Operating System |
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| 22 | * Copyright (c) 1991,1990,1989 Carnegie Mellon University |
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| 23 | * All Rights Reserved. |
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| 24 | * |
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| 25 | * Permission to use, copy, modify and distribute this software and its |
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| 26 | * documentation is hereby granted, provided that both the copyright |
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| 27 | * notice and this permission notice appear in all copies of the |
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| 28 | * software, derivative works or modified versions, and any portions |
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| 29 | * thereof, and that both notices appear in supporting documentation. |
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| 30 | * |
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| 31 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
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| 32 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
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| 33 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
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| 34 | * |
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| 35 | * Carnegie Mellon requests users of this software to return to |
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| 36 | * |
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| 37 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
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| 38 | * School of Computer Science |
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| 39 | * Carnegie Mellon University |
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| 40 | * Pittsburgh PA 15213-3890 |
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| 41 | * |
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| 42 | * any improvements or extensions that they make and grant Carnegie Mellon |
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| 43 | * the rights to redistribute these changes. |
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| 44 | */ |
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| 45 | /* |
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| 46 | * C library -- _setjmp, _longjmp |
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| 47 | * |
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| 48 | * _longjmp(a,v) |
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| 49 | * will generate a "return(v)" from |
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| 50 | * the last call to |
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| 51 | * _setjmp(a) |
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| 52 | * by restoring registers from the stack, |
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| 53 | * The previous signal state is NOT restored. |
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| 54 | * |
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| 55 | */ |
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| 56 | |
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| 57 | #define EXT_C(sym) sym |
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| 58 | #define FUNCTION(x) .globl EXT_C(x) ; .type EXT_C(x), @function ; EXT_C(x): |
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| 59 | |
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| 60 | .file "setjmp.S" |
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| 61 | |
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| 62 | .text |
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| 63 | |
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| 64 | FUNCTION(setjmp) |
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| 65 | movl 4(%esp), %ecx /* fetch buffer */ |
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| 66 | movl %ebx, 0(%ecx) |
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| 67 | movl %esi, 4(%ecx) |
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| 68 | movl %edi, 8(%ecx) |
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| 69 | movl %ebp, 12(%ecx) /* save frame pointer of caller */ |
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| 70 | popl %edx |
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| 71 | movl %esp, 16(%ecx) /* save stack pointer of caller */ |
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| 72 | movl %edx, 20(%ecx) /* save pc of caller */ |
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| 73 | xorl %eax, %eax |
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| 74 | jmp *%edx |
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| 75 | |
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| 76 | FUNCTION(longjmp) |
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| 77 | movl 8(%esp), %eax /* return(v) */ |
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| 78 | movl 4(%esp), %ecx /* fetch buffer */ |
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| 79 | movl 0(%ecx), %ebx |
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| 80 | movl 4(%ecx), %esi |
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| 81 | movl 8(%ecx), %edi |
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| 82 | movl 12(%ecx), %ebp |
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| 83 | movl 16(%ecx), %esp |
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| 84 | orl %eax, %eax |
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| 85 | jnz 0f |
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| 86 | incl %eax |
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| 87 | 0: jmp *20(%ecx) /* done, return.... */ |
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