| /* SPDX-License-Identifier: BSD-3-Clause */ |
| /* |
| * crt0-efi-x86_64.S - x86_64 EFI startup code. |
| * Copyright (C) 1999 Hewlett-Packard Co. |
| * Contributed by David Mosberger <davidm@hpl.hp.com>. |
| * Copyright (C) 2005 Intel Corporation |
| * Contributed by Fenghua Yu <fenghua.yu@intel.com>. |
| * |
| * All rights reserved. |
| */ |
| .text |
| .align 4 |
| |
| .globl _start |
| _start: |
| subq $8, %rsp |
| |
| pushq %rcx |
| pushq %rdx |
| |
| lea image_base(%rip), %rcx |
| lea _DYNAMIC(%rip), %rdx |
| |
| call _relocate |
| |
| popq %rdx |
| popq %rcx |
| |
| testq %rax, %rax |
| jnz .exit |
| |
| call efi_main |
| .exit: |
| addq $8, %rsp |
| |
| ret |
| |
| /* |
| * hand-craft a dummy .reloc section so EFI knows it's a relocatable |
| * executable: |
| */ |
| .data |
| dummy: .long 0 |
| |
| #define IMAGE_REL_ABSOLUTE 0 |
| .section .reloc, "a" |
| label1: |
| .long dummy-label1 /* Page RVA */ |
| .long 10 /* Block Size (2*4+2) */ |
| .word (IMAGE_REL_ABSOLUTE << 12) + 0 /* reloc for dummy */ |
