#ident "$Id: c32entry.S,v 1.5 2005/01/03 08:23:16 hpa Exp $"
# -----------------------------------------------------------------------
#   
#   Copyright 2003 H. Peter Anvin - All Rights Reserved
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#   obtaining a copy of this software and associated documentation
#   files (the "Software"), to deal in the Software without
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# -----------------------------------------------------------------------

# COM32 start up code - must be linked first in the binary

	
		.section ".text","ax"
		.globl _start
_start:
		# This first instruction acts as COM32 magic number
		movl $0x21cd4cff,%eax

		# Upwards string operations
		cld

		# Zero the .bss segment
		xorl %eax,%eax
		movl $__bss_start,%edi		# Symbol provided by linker
		movl $_end+3,%ecx		# Symbol provided by linker
		subl %edi,%ecx
		shrl $2,%ecx
		rep ; stosl

		# Copy COM32 invocation parameters
		leal 4(%esp),%esi		# Argument list
		movl $__com32,%edi
		movl $6,%ecx
		movl %esp,-4(%edi)		# Save the initial stack ptr
		cmpl (%esi),%ecx
		jbe 1f
		movl (%esi),%ecx
1:		rep ; movsl

		# Run program; we call this __start rather than main since we
		# did not parse the command line or anything like that.
		jmp __start

		.section ".bss","aw"
		.globl __entry_esp
__entry_esp:	.space 4
		.globl __com32
__com32:	.space 4*6