1/* $OpenBSD: start.S,v 1.5 2022/07/30 21:06:54 patrick Exp $ */ 2/*- 3 * Copyright (c) 2014 Andrew Turner 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD: head/sys/boot/efi/loader/arch/arm64/start.S 282727 2015-05-10 13:24:26Z ian $ 28 */ 29 30/* 31 * We need to be a PE32+ file for EFI. On some architectures we can use 32 * objcopy to create the correct file, however on arm64 we need to do 33 * it ourselves. 34 */ 35 36#define IMAGE_FILE_MACHINE_ARM64 0xaa64 37 38#define IMAGE_SCN_CNT_CODE 0x00000020 39#define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040 40#define IMAGE_SCN_MEM_DISCARDABLE 0x02000000 41#define IMAGE_SCN_MEM_EXECUTE 0x20000000 42#define IMAGE_SCN_MEM_READ 0x40000000 43#define IMAGE_SCN_MEM_WRITE 0x80000000 44 45 .globl __data_start 46 47 .section .peheader, "a" 48efi_start: 49 /* The MS-DOS Stub, only used to get the offset of the COFF header */ 50 .ascii "MZ" 51 .short 0 52 .space 0x38 53 .long pe_sig - efi_start 54 55 /* The PE32 Signature. Needs to be 8-byte aligned */ 56 .align 3 57pe_sig: 58 .ascii "PE" 59 .short 0 60coff_head: 61 .short IMAGE_FILE_MACHINE_ARM64 /* AArch64 file */ 62 .short 2 /* 2 Sections */ 63 .long 0 /* Timestamp */ 64 .long 0 /* No symbol table */ 65 .long 0 /* No symbols */ 66 .short section_table - optional_header /* Optional header size */ 67 .short 0x0206 /* Characteristics */ 68 69optional_header: 70 .short 0x020b /* PE32+ (64-bit addressing) */ 71 .byte 0 /* Major linker version */ 72 .byte 0 /* Minor linker version */ 73 .long _etext - _end_header /* Code size */ 74 .long __data_size /* Initialized data size */ 75 .long 0 /* No uninitialized data */ 76 .long _start - efi_start /* Entry point */ 77 .long _end_header - efi_start /* Start of code */ 78 79optional_windows_header: 80 .quad 0 /* Image base */ 81 .long 4096 /* Section Alignment */ 82 .long 512 /* File alignment */ 83 .short 0 /* Major OS version */ 84 .short 0 /* Minor OS version */ 85 .short 0 /* Major image version */ 86 .short 0 /* Minor image version */ 87 .short 0 /* Major subsystem version */ 88 .short 0 /* Minor subsystem version */ 89 .long 0 /* Win32 version */ 90 .long _edata - efi_start /* Image size */ 91 .long _end_header - efi_start /* Header size */ 92 .long 0 /* Checksum */ 93 .short 0xa /* Subsystem (EFI app) */ 94 .short 0 /* DLL Characteristics */ 95 .quad 0 /* Stack reserve */ 96 .quad 0 /* Stack commit */ 97 .quad 0 /* Heap reserve */ 98 .quad 0 /* Heap commit */ 99 .long 0 /* Loader flags */ 100 .long 6 /* Number of RVAs */ 101 102 /* RVAs: */ 103 .quad 0 104 .quad 0 105 .quad 0 106 .quad 0 107 .quad 0 108 .quad 0 109 110section_table: 111 /* The contents of the loader */ 112 .ascii ".text" 113 .byte 0 114 .byte 0 115 .byte 0 /* Pad to 8 bytes */ 116 .long _etext - _end_header /* Virtual size */ 117 .long _end_header - efi_start /* Virtual address */ 118 .long _etext - _end_header /* Size of raw data */ 119 .long _end_header - efi_start /* Pointer to raw data */ 120 .long 0 /* Pointer to relocations */ 121 .long 0 /* Pointer to line numbers */ 122 .short 0 /* Number of relocations */ 123 .short 0 /* Number of line numbers */ 124 .long (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | \ 125 IMAGE_SCN_MEM_READ) /* Characteristics */ 126 127 /* The contents of the loader */ 128 .ascii ".data" 129 .byte 0 130 .byte 0 131 .byte 0 /* Pad to 8 bytes */ 132 .long __data_size /* Virtual size */ 133 .long __data_start - efi_start /* Virtual address */ 134 .long __data_size /* Size of raw data */ 135 .long __data_start - efi_start /* Pointer to raw data */ 136 .long 0 /* Pointer to relocations */ 137 .long 0 /* Pointer to line numbers */ 138 .short 0 /* Number of relocations */ 139 .short 0 /* Number of line numbers */ 140 .long (IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | \ 141 IMAGE_SCN_MEM_WRITE) /* Characteristics */ 142 143 .align 12 144_end_header: 145 146 .text 147 .globl _start 148_start: 149 /* Save the boot params to the stack */ 150 stp x0, x1, [sp, #-16]! 151 152 adr x0, __bss_start 153 adr x1, __bss_end 154 155 b 2f 156 1571: 158 stp xzr, xzr, [x0], #16 1592: 160 cmp x0, x1 161 b.lo 1b 162 163 adr x0, ImageBase 164 adr x1, _DYNAMIC 165 166 bl self_reloc 167 168 ldp x0, x1, [sp], #16 169 170 bl efi_main 171 1721: b 1b 173 174 .data 175 .align 4 176#include "dt_blob.S" 177