| 1 | /* crt0-efi-ia32.S - x86 EFI startup code. |
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| 2 | Copyright (C) 1999 Hewlett-Packard Co. |
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| 3 | Contributed by David Mosberger <davidm@hpl.hp.com>. |
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| 4 | |
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| 5 | All rights reserved. |
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| 6 | |
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| 7 | Redistribution and use in source and binary forms, with or without |
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| 8 | modification, are permitted provided that the following conditions |
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| 9 | are met: |
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| 10 | |
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| 11 | * Redistributions of source code must retain the above copyright |
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| 12 | notice, this list of conditions and the following disclaimer. |
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| 13 | * Redistributions in binary form must reproduce the above |
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| 14 | copyright notice, this list of conditions and the following |
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| 15 | disclaimer in the documentation and/or other materials |
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| 16 | provided with the distribution. |
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| 17 | * Neither the name of Hewlett-Packard Co. nor the names of its |
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| 18 | contributors may be used to endorse or promote products derived |
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| 19 | from this software without specific prior written permission. |
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| 20 | |
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| 21 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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| 22 | CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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| 23 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 24 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 25 | DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
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| 26 | BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
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| 27 | OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 28 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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| 29 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 30 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR |
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| 31 | TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF |
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| 32 | THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 33 | SUCH DAMAGE. |
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| 34 | */ |
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| 35 | |
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| 36 | .text |
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| 37 | .align 4 |
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| 38 | |
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| 39 | .globl _start |
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| 40 | _start: |
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| 41 | pushl %ebp |
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| 42 | movl %esp,%ebp |
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| 43 | |
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| 44 | pushl 12(%ebp) # copy "image" argument |
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| 45 | pushl 8(%ebp) # copy "systab" argument |
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| 46 | |
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| 47 | call 0f |
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| 48 | 0: popl %eax |
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| 49 | movl %eax,%ebx |
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| 50 | |
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| 51 | addl $ImageBase-0b,%eax # %eax = ldbase |
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| 52 | addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC |
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| 53 | |
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| 54 | pushl %ebx # pass _DYNAMIC as second argument |
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| 55 | pushl %eax # pass ldbase as first argument |
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| 56 | call _relocate |
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| 57 | popl %ebx |
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| 58 | popl %ebx |
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| 59 | testl %eax,%eax |
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| 60 | jne .exit |
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| 61 | |
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| 62 | call efi_main # call app with "image" and "systab" argument |
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| 63 | |
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| 64 | .exit: leave |
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| 65 | ret |
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| 66 | |
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| 67 | // hand-craft a dummy .reloc section so EFI knows it's a relocatable executable: |
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| 68 | |
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| 69 | .data |
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| 70 | dummy: .long 0 |
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| 71 | |
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| 72 | #define IMAGE_REL_ABSOLUTE 0 |
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| 73 | .section .reloc |
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| 74 | .long dummy // Page RVA |
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| 75 | .long 10 // Block Size (2*4+2) |
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| 76 | .word (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy |
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