1/* SPDX-License-Identifier: BSD-3-Clause */
2/*
3 * crt0-efi-x86_64.S - x86_64 EFI startup code.
4 * Copyright (C) 1999 Hewlett-Packard Co.
5 * Contributed by David Mosberger <davidm@hpl.hp.com>.
6 * Copyright (C) 2005 Intel Corporation
7 * Contributed by Fenghua Yu <fenghua.yu@intel.com>.
8 *
9 * All rights reserved.
10 */
11	.text
12	.align 4
13
14	.globl _start
15_start:
16	subq $8, %rsp
17
18	pushq %rcx
19	pushq %rdx
20
21	lea image_base(%rip), %rcx
22	lea _DYNAMIC(%rip), %rdx
23
24	call _relocate
25
26	popq %rdx
27	popq %rcx
28
29	testq %rax, %rax
30	jnz .exit
31
32	call efi_main
33.exit:
34	addq $8, %rsp
35
36	ret
37
38	/*
39	 * hand-craft a dummy .reloc section so EFI knows it's a relocatable
40	 * executable:
41	 */
42	.data
43dummy:	.long	0
44
45#define IMAGE_REL_ABSOLUTE	0
46	.section .reloc, "a"
47label1:
48	.long	dummy-label1				/* Page RVA */
49	.long	10					/* Block Size (2*4+2) */
50	.word	(IMAGE_REL_ABSOLUTE << 12) +  0		/* reloc for dummy */
51