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/* crt0-efi-ia32.S - x86 EFI startup code.
Copyright (C) 1999 Hewlett-Packard Co.
Contributed by David Mosberger <davidm@hpl.hp.com>.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials
provided with the distribution.
* Neither the name of Hewlett-Packard Co. nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
.text
.align 4
.globl _start
_start:
pushl %ebp
movl %esp,%ebp
pushl 12(%ebp) # copy "image" argument
pushl 8(%ebp) # copy "systab" argument
call 0f
0: popl %eax
movl %eax,%ebx
addl $image_base-0b,%eax # %eax = ldbase
addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC
pushl %ebx # pass _DYNAMIC as second argument
pushl %eax # pass ldbase as first argument
call _relocate
popl %ebx
popl %ebx
testl %eax,%eax
jne .exit
call efi_main # call app with "image" and "systab" argument
.exit: leave
ret
/* hand-craft a dummy .reloc section so EFI knows it's a relocatable executable: */
.data
dummy: .long 0
#define IMAGE_REL_ABSOLUTE 0
.section .reloc
.long dummy /* Page RVA */
.long 10 /* Block Size (2*4+2) */
.word (IMAGE_REL_ABSOLUTE<<12) + 0 /* reloc for dummy */
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