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