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71 lines
2.2 KiB
ArmAsm
71 lines
2.2 KiB
ArmAsm
.file "longjmp.S"
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/*
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* Copyright (C) 1998, 1999, Jonathan S. Shapiro.
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*
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* This file is part of the EROS Operating System.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* typedef struct {
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* unsigned long ebx, esi, edi;
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* unsigned long ebp;
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* unsigned long sp;
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* unsigned long pc;
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* } jmp_buf[1];
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*/
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/*
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* On entry, the stack to longjmp looks like:
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*
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* value
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* ptr to jmp_buf
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* return PC
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*/
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.globl _longjmp
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_longjmp:
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pushl %ebp
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movl %esp,%ebp
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movl 8(%ebp),%ecx /* address of jmp_buf to ecx */
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movl 12(%ebp),%eax /* return value to %eax */
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testl %eax,%eax
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jne 1f
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incl %eax /* return 1 if handed 0 */
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1:
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movl (%ecx),%ebx /* restore %ebx */
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movl 4(%ecx),%esi /* restore %esi */
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movl 8(%ecx),%edi /* restore %edi */
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/*
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* From this instant on we are not running in a valid frame
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*/
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movl 12(%ecx),%ebp /* restore %ebp */
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movl 16(%ecx),%esp /* restore %esp */
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/* movl 20(%ecx),%eax return PC */
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/*
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* Since we are abandoning the stack in any case,
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* there isn't much point in doing the usual return
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* discipline.
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*/
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jmpl *20(%ecx)
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