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 45 460: 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 _entry 60 addq $8, %rsp 61 62.exit: 63 ret 64 65 // hand-craft a dummy .reloc section so EFI knows it's a relocatable executable: 66 67 .data 68dummy: .4byte 0 69 70#define IMAGE_REL_ABSOLUTE 0 71 .section .reloc, "a" 72label1: 73 .4byte dummy-label1 // Page RVA 74 .4byte 12 // Block Size (2*4+2*2), must be aligned by 32 Bits 75 .2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy 76 .2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy 77 78#if defined(__ELF__) && defined(__linux__) 79 .section .note.GNU-stack,"",%progbits 80#endif 81