232 lines
7.0 KiB
ArmAsm
232 lines
7.0 KiB
ArmAsm
/*
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* source in this file came from
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* the 386BSD boot blocks written by Julian Elischer.
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*
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* Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
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*
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* $Id: asm.s,v 1.2 1993/08/02 17:52:49 mycroft Exp $
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*/
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/*
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Copyright 1988, 1989, 1990, 1991, 1992
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by Intel Corporation, Santa Clara, California.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appears in all
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copies and that both the copyright notice and this permission notice
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appear in supporting documentation, and that the name of Intel
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not be used in advertising or publicity pertaining to distribution
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of the software without specific, written prior permission.
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INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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.file "asm.s"
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#include "asm.h"
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.text
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ENTRY(StartProg)
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/* void StartProg(u_long phyaddr, u_long *args)
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* start the program in protected mode. phyaddr is the entry point.
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*/
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#ifndef USE_BUFFER
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push %ebp
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mov %esp, %ebp
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# get things we need into registers
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movl 0x8(%ebp), %ecx # entry offset
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movl 0x0c(%ebp), %eax # &argv
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# make a new stack at 0:0xa0000 (big segs)
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mov $KERN_DATA_SEG, %ebx
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movw %bx, %ss
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movl $0xa0000,%ebx
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movl %ebx,%esp
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# push some number of args onto the stack
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pushl $0 # nominally a cyl offset in the boot.
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pushl 0x8(%eax) # argv[2] = bootdev
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pushl 0x4(%eax) # argv[1] = howto
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pushl $0 # dummy 'return' address
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# push on our entry address
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mov $KERN_CODE_SEG, %ebx # segment
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pushl %ebx
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pushl %ecx
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# convert over the other data segs
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mov $KERN_DATA_SEG, %ebx
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movw %bx, %ds
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movw %bx, %es
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# convert the PC (and code seg)
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lret
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#else
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/* test version - relocating, kernel move (TBD) */
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/* if necessary, move ourself out of the way
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* move the copy of the kernel to its correct load point
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* set up a stack and transfer args to it
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* call the entry point
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* this is best done in assembly as the potential relocation will
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* have a bad effect on non-PIC code.
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*/
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/* get things we need into registers */
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movl 0x8(%ebp), %ecx # entry offset
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movl 0x0c(%ebp), %eax # &argv
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/* relocate ourselves to <tmp_reloc_org> */
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# PhysBcopy(RELOC, tmp_reloc_org, WORK_AREA_SIZE);
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mov $RELOC, %esi
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mov $tmp_reloc_org, %edi
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mov $WORK_AREA_SIZE, %ecx
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mov %ds, %ax
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mov %ax, %es
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rep
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movsb
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/* TBD - could probably also do this by munging a seg descriptor.
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* would it be easier?
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*/
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ljmp $KERN_CODE_SEG, tmp_reloc_org+$1f
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1:
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/* now we are PIC - caveats */
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/* move the stack pointer to the new copy */
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add tmp_reloc_org-xxx, %esp
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/* push some number of args onto the stack */
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pushl $0 # nominally a cyl offset in the boot.
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pushl 0x8(%eax) # argv[2] = bootdev
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pushl 0x4(%eax) # argv[1] = howto
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pushl $0 # dummy 'return' address
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/* push on our entry address */
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mov $0x08, %ebx # segment
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pushl %ebx
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pushl %ecx
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/* copy loaded file to its destination (TBD) */
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# PhysBcopy(kcopy, korg, ksize);
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mov kern_copy_org, %esi
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mov boot_area_org, %edi
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mov xxxksize, %ecx
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mov %ds, %ax
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mov %ax, %es
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rep
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movsb
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/* convert the PC (and code seg) */
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lret
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#endif
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/*
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* C library -- _setjmp, _longjmp
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*
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* longjmp(a,v)
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* will generate a "return(v)" from the last call to
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* setjmp(a)
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* by restoring registers from the stack.
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* The previous signal state is restored.
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*/
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ENTRY(setjmp)
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movl 4(%esp),%ecx
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movl 0(%esp),%edx
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movl %edx, 0(%ecx)
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movl %ebx, 4(%ecx)
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movl %esp, 8(%ecx)
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movl %ebp,12(%ecx)
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movl %esi,16(%ecx)
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movl %edi,20(%ecx)
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movl %eax,24(%ecx)
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movl $0,%eax
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ret
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ENTRY(longjmp)
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movl 4(%esp),%edx
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movl 8(%esp),%eax
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movl 0(%edx),%ecx
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movl 4(%edx),%ebx
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movl 8(%edx),%esp
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movl 12(%edx),%ebp
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movl 16(%edx),%esi
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movl 20(%edx),%edi
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cmpl $0,%eax
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jne 1f
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movl $1,%eax
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1: movl %ecx,0(%esp)
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ret
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