projects / efi-boot-shim.git / blame
| Commit | Line | Data |
|---|---|---|
| 031e5cce SM |
1 | /* crt0-efi-x86_64.S - x86_64 EFI startup code. |
| 2 | Copyright (C) 1999 Hewlett-Packard Co. | |
| 3 | Contributed by David Mosberger <davidm@hpl.hp.com>. | |
| 4 | Copyright (C) 2005 Intel Co. | |
| 5 | Contributed by Fenghua Yu <fenghua.yu@intel.com>. | |
| 6 | ||
| 7 | All rights reserved. | |
| 8 | ||
| 9 | Redistribution and use in source and binary forms, with or without | |
| 10 | modification, are permitted provided that the following conditions | |
| 11 | are met: | |
| 12 | ||
| 13 | * Redistributions of source code must retain the above copyright | |
| 14 | notice, this list of conditions and the following disclaimer. | |
| 15 | * Redistributions in binary form must reproduce the above | |
| 16 | copyright notice, this list of conditions and the following | |
| 17 | disclaimer in the documentation and/or other materials | |
| 18 | provided with the distribution. | |
| 19 | * Neither the name of Hewlett-Packard Co. nor the names of its | |
| 20 | contributors may be used to endorse or promote products derived | |
| 21 | from this software without specific prior written permission. | |
| 22 | ||
| 23 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND | |
| 24 | CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, | |
| 25 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 26 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 27 | DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS | |
| 28 | BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, | |
| 29 | OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 30 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 31 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 32 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR | |
| 33 | TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF | |
| 34 | THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 35 | SUCH DAMAGE. | |
| 36 | */ | |
| 37 | .text | |
| 38 | .align 4 | |
| 39 | ||
| 40 | .globl _start | |
| 41 | _start: | |
| 42 | subq $8, %rsp | |
| 43 | pushq %rcx | |
| 44 | pushq %rdx | |
| 45 | ||
| 46 | 0: | |
| 47 | lea ImageBase(%rip), %rdi | |
| 48 | lea _DYNAMIC(%rip), %rsi | |
| 49 | ||
| 50 | popq %rcx | |
| 51 | popq %rdx | |
| 52 | pushq %rcx | |
| 53 | pushq %rdx | |
| 54 | call _relocate | |
| 55 | ||
| 56 | popq %rdi | |
| 57 | popq %rsi | |
| 58 | ||
| 59 | call efi_main | |
| 60 | addq $8, %rsp | |
| 61 | ||
| 031e5cce SM |
62 | ret |
| 63 | ||
| 64 | // hand-craft a dummy .reloc section so EFI knows it's a relocatable executable: | |
| 65 | .data | |
| 66 | .dummy0: | |
| 67 | .dummy1: | |
| e6ace38a | 68 | .4byte 0 |
| 031e5cce SM |
69 | |
| 70 | #define IMAGE_REL_ABSOLUTE 0 | |
| 71 | .section .reloc, "a" | |
| e6ace38a SM |
72 | .4byte .dummy1-.dummy0 // Page RVA |
| 73 | .4byte 10 // Block Size (2*4+2) | |
| 74 | .2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy | |
| fd2d9f03 | 75 | .section .note.GNU-stack,"a" |