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 (at) hpl.hp.com>. 6 * Copyright (C) 2005 Intel Corporation 7 * Contributed by Fenghua Yu <fenghua.yu (at) 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 mov %rcx, %r8 22 mov %rdx, %r9 23 24 lea image_base(%rip), %rcx 25 lea _DYNAMIC(%rip), %rdx 26 27 call _relocate 28 29 popq %rdx 30 popq %rcx 31 32 testq %rax, %rax 33 jnz .exit 34 35 call efi_main 36 .exit: 37 addq $8, %rsp 38 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, "a" 50 label1: 51 .long dummy-label1 /* Page RVA */ 52 .long 10 /* Block Size (2*4+2) */ 53 .word (IMAGE_REL_ABSOLUTE << 12) + 0 /* reloc for dummy */ 54
