| Ben Stoltz | 3dcdd17 | 2015-08-04 12:33:46 -0600 | [diff] [blame] | 1 | /* |
| 2 | * crt0-efi-ia32.S - x86 EFI startup code. |
| 3 | * |
| 4 | * Copyright (C) 1999 Hewlett-Packard Co. |
| 5 | * Contributed by David Mosberger <davidm@hpl.hp.com>. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * SPDX-License-Identifier: BSD-3-Clause |
| 9 | */ |
| 10 | |
| 11 | .text |
| 12 | .align 4 |
| 13 | |
| 14 | .globl _start |
| 15 | _start: |
| 16 | pushl %ebp |
| 17 | movl %esp,%ebp |
| 18 | |
| 19 | pushl 12(%ebp) # copy "image" argument |
| 20 | pushl 8(%ebp) # copy "systab" argument |
| 21 | |
| 22 | call 0f |
| 23 | 0: popl %eax |
| 24 | movl %eax,%ebx |
| 25 | |
| 26 | addl $image_base-0b,%eax # %eax = ldbase |
| 27 | addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC |
| 28 | |
| 29 | pushl %ebx # pass _DYNAMIC as second argument |
| 30 | pushl %eax # pass ldbase as first argument |
| 31 | call _relocate |
| 32 | popl %ebx |
| 33 | popl %ebx |
| 34 | testl %eax,%eax |
| 35 | jne .exit |
| 36 | call efi_main # call app with "image" and "systab" argument |
| 37 | |
| 38 | .exit: leave |
| 39 | ret |
| 40 | |
| 41 | /* |
| 42 | * hand-craft a dummy .reloc section so EFI knows it's a relocatable |
| 43 | * executable: |
| 44 | */ |
| 45 | .data |
| 46 | dummy: .long 0 |
| 47 | |
| 48 | #define IMAGE_REL_ABSOLUTE 0 |
| 49 | .section .reloc |
| 50 | .long dummy /* Page RVA */ |
| 51 | .long 10 /* Block Size (2*4+2) */ |
| 52 | .word (IMAGE_REL_ABSOLUTE << 12) + 0 /* reloc for dummy */ |