1/* crt0-efi-ia32.S - x86 EFI startup code.
2   Copyright (C) 1999 Hewlett-Packard Co.
3	Contributed by David Mosberger <davidm@hpl.hp.com>.
4
5    All rights reserved.
6
7    Redistribution and use in source and binary forms, with or without
8    modification, are permitted provided that the following conditions
9    are met:
10
11    * Redistributions of source code must retain the above copyright
12      notice, this list of conditions and the following disclaimer.
13    * Redistributions in binary form must reproduce the above
14      copyright notice, this list of conditions and the following
15      disclaimer in the documentation and/or other materials
16      provided with the distribution.
17    * Neither the name of Hewlett-Packard Co. nor the names of its
18      contributors may be used to endorse or promote products derived
19      from this software without specific prior written permission.
20
21    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
22    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
23    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
26    BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
27    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
31    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
32    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33    SUCH DAMAGE.
34*/
35
36	.text
37	.align 4
38
39	.globl _start
40_start:
41	pushl %ebp
42	movl %esp,%ebp
43
44	pushl 12(%ebp)			# copy "image" argument
45	pushl  8(%ebp)			# copy "systab" argument
46
47	call 0f
480:	popl %eax
49	movl %eax,%ebx
50
51	addl $ImageBase-0b,%eax		# %eax = ldbase
52	addl $_DYNAMIC-0b,%ebx		# %ebx = _DYNAMIC
53
54	pushl %ebx			# pass _DYNAMIC as second argument
55	pushl %eax			# pass ldbase as first argument
56	call _relocate
57	popl %ebx
58	popl %ebx
59 	testl %eax,%eax
60 	jne .exit
61
62  	call efi_main			# call app with "image" and "systab" argument
63
64.exit:	leave
65  	ret
66
67 	// hand-craft a dummy .reloc section so EFI knows it's a relocatable executable:
68	// we're using relocation type IMAGE_REL_BASED_ABSOLUTE which is ignored
69
70#define IMAGE_REL_ABSOLUTE	0
71	.section .reloc
72	.long	0					// Page RVA
73	.long	12					// Block Size (2*4+2*2)
74	.word	(IMAGE_REL_ABSOLUTE<<12) +  0
75	.word	(IMAGE_REL_ABSOLUTE<<12) +  0
76