121 lines
3.4 KiB
ArmAsm
121 lines
3.4 KiB
ArmAsm
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/* $NetBSD: startprog.S,v 1.1.1.1 1997/03/14 02:40:33 perry Exp $ */
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/* starts program in protected mode / flat space
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with given stackframe
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needs global variables flatcodeseg and flatdataseg
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(gdt offsets)
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derivied from: NetBSD:sys/arch/i386/boot/asm.S
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*/
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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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/*
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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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#include <machine/asm.h>
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/*
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* startprog(phyaddr,argc,argv,stack)
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* start the program on protected mode where phyaddr is the entry point
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*/
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ENTRY(startprog)
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pushl %ebp
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movl %esp, %ebp
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# prepare a new stack
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movl $flatdataseg, %ebx
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movw %bx, %es # for arg copy
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movl 20(%ebp), %eax # stack
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subl $4,%eax
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movl %eax, %edi
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# push some number of args onto the stack
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movl 12(%ebp), %ecx # argc
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movl %ecx, %eax
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decl %eax
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shl $2, %eax
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addl 16(%ebp), %eax # ptr to last arg
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movl %eax, %esi
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std # backwards
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rep
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movsl
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cld # LynxOS depends on it
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movl 8(%ebp), %ecx # entry
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# set new stackptr (movsl decd sp 1 more -> dummy return address)
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movw %bx, %ss
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movl %edi, %esp
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# plug in a return address so that FreeBSD detects we are using
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# bootinfo
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movl $ourreturn, %eax
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movl %eax, (%esp)
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# push on our entry address
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movl $flatcodeseg, %ebx # segment
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pushl %ebx
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pushl %ecx #entry
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# convert over the other data segs
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movl $flatdataseg, %ebx
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movl %bx, %ds
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movl %bx, %es
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# convert the PC (and code seg)
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lret
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ourreturn:
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/* For now there is not much we can do, just lock in a loop */
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jmp ourreturn
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