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| 1 | /* crt0-efi-ia32.S - x86 EFI startup code. |
1 | /* crt0-efi-ia32.S - x86 EFI startup code. |
| 2 | Copyright (C) 1999 Hewlett-Packard Co. |
2 | Copyright (C) 1999 Hewlett-Packard Co. |
| 3 | Contributed by David Mosberger <davidm@hpl.hp.com>. |
3 | Contributed by David Mosberger <davidm@hpl.hp.com>. |
| 4 | 4 | ||
| 5 | This file is part of GNU-EFI, the GNU EFI development environment. |
5 | This file is part of GNU-EFI, the GNU EFI development environment. |
| 6 | 6 | ||
| 7 | GNU EFI is free software; you can redistribute it and/or modify |
7 | GNU EFI is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
10 | any later version. |
| 11 | 11 | ||
| 12 | GNU EFI is distributed in the hope that it will be useful, |
12 | GNU EFI is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
| 16 | 16 | ||
| 17 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU EFI; see the file COPYING. If not, write to the Free |
18 | along with GNU EFI; see the file COPYING. If not, write to the Free |
| 19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 20 | 02111-1307, USA. */ |
20 | 02111-1307, USA. */ |
| 21 | 21 | ||
| 22 | .text |
22 | .text |
| 23 | .align 4 |
23 | .align 4 |
| 24 | 24 | ||
| 25 | .globl _start |
25 | .globl _start |
| 26 | _start: |
26 | _start: |
| 27 | pushl %ebp |
27 | pushl %ebp |
| 28 | movl %esp,%ebp |
28 | movl %esp,%ebp |
| 29 | 29 | ||
| 30 | pushl 12(%ebp) # copy "image" argument |
30 | pushl 12(%ebp) # copy "image" argument |
| 31 | pushl 8(%ebp) # copy "systab" argument |
31 | pushl 8(%ebp) # copy "systab" argument |
| 32 | 32 | ||
| 33 | call 0f |
33 | call 0f |
| 34 | 0: popl %eax |
34 | 0: popl %eax |
| 35 | movl %eax,%ebx |
35 | movl %eax,%ebx |
| 36 | 36 | ||
| 37 | addl $ImageBase-0b,%eax # %eax = ldbase |
37 | addl $ImageBase-0b,%eax # %eax = ldbase |
| 38 | addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC |
38 | addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC |
| 39 | 39 | ||
| 40 | pushl %ebx # pass _DYNAMIC as second argument |
40 | pushl %ebx # pass _DYNAMIC as second argument |
| 41 | pushl %eax # pass ldbase as first argument |
41 | pushl %eax # pass ldbase as first argument |
| 42 | call _relocate |
42 | call _relocate |
| 43 | popl %ebx |
43 | popl %ebx |
| 44 | popl %ebx |
44 | popl %ebx |
| 45 | testl %eax,%eax |
45 | testl %eax,%eax |
| 46 | jne .exit |
46 | jne .exit |
| 47 | 47 | ||
| 48 | call efi_main # call app with "image" and "systab" argument |
48 | call efi_main # call app with "image" and "systab" argument |
| 49 | 49 | ||
| 50 | .exit: leave |
50 | .exit: leave |
| 51 | ret |
51 | ret |
| 52 | 52 | ||
| 53 | // hand-craft a dummy .reloc section so EFI knows it's a relocatable executable: |
53 | // hand-craft a dummy .reloc section so EFI knows it's a relocatable executable: |
| 54 | 54 | ||
| 55 | .data |
55 | .data |
| 56 | dummy: .long 0 |
56 | dummy: .long 0 |
| 57 | 57 | ||
| 58 | #define IMAGE_REL_ABSOLUTE 0 |
58 | #define IMAGE_REL_ABSOLUTE 0 |
| 59 | .section .reloc, "a" |
59 | .section .reloc, "a" |
| 60 | .long dummy // Page RVA |
60 | .long dummy // Page RVA |
| 61 | .long 10 // Block Size (2*4+2) |
61 | .long 10 // Block Size (2*4+2) |
| 62 | .word (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy |
62 | .word (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy |
| 63 | 63 | ||