1/*- 2 * Copyright (c) 2014 Andrew Turner 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29/* 30 * We need to be a PE32+ file for EFI. On some architectures we can use 31 * objcopy to create the correct file, however on arm64 we need to do 32 * it ourselves. 33 */ 34 35#define IMAGE_FILE_MACHINE_ARM64 0xaa64 36 37#define IMAGE_SCN_CNT_CODE 0x00000020 38#define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040 39#define IMAGE_SCN_MEM_DISCARDABLE 0x02000000 40#define IMAGE_SCN_MEM_EXECUTE 0x20000000 41#define IMAGE_SCN_MEM_READ 0x40000000 42 43 .section .peheader,"a" 44efi_start: 45 /* The MS-DOS Stub, only used to get the offset of the COFF header */ 46 .ascii "MZ" 47 .short 0 48 .space 0x38 49 .long pe_sig - efi_start 50 51 /* The PE32 Signature. Needs to be 8-byte aligned */ 52 .align 3 53pe_sig: 54 .ascii "PE" 55 .short 0 56coff_head: 57 .short IMAGE_FILE_MACHINE_ARM64 /* AArch64 file */ 58 .short 2 /* 2 Sections */ 59 .long 0 /* Timestamp */ 60 .long 0 /* No symbol table */ 61 .long 0 /* No symbols */ 62 .short section_table - optional_header /* Optional header size */ 63 .short 0 /* Characteristics TODO: Fill in */ 64 65optional_header: 66 .short 0x020b /* PE32+ (64-bit addressing) */ 67 .byte 0 /* Major linker version */ 68 .byte 0 /* Minor linker version */ 69 .long _edata - _end_header /* Code size */ 70 .long 0 /* No initialized data */ 71 .long 0 /* No uninitialized data */ 72 .long _start - efi_start /* Entry point */ 73 .long _end_header - efi_start /* Start of code */ 74 75optional_windows_header: 76 .quad 0 /* Image base */ 77 .long 32 /* Section Alignment */ 78 .long 8 /* File alignment */ 79 .short 0 /* Major OS version */ 80 .short 0 /* Minor OS version */ 81 .short 0 /* Major image version */ 82 .short 0 /* Minor image version */ 83 .short 0 /* Major subsystem version */ 84 .short 0 /* Minor subsystem version */ 85 .long 0 /* Win32 version */ 86 .long _edata - efi_start /* Image size */ 87 .long _end_header - efi_start /* Header size */ 88 .long 0 /* Checksum */ 89 .short 0xa /* Subsystem (EFI app) */ 90 .short 0 /* DLL Characteristics */ 91 .quad 0 /* Stack reserve */ 92 .quad 0 /* Stack commit */ 93 .quad 0 /* Heap reserve */ 94 .quad 0 /* Heap commit */ 95 .long 0 /* Loader flags */ 96 .long 6 /* Number of RVAs */ 97 98 /* RVAs: */ 99 .quad 0 100 .quad 0 101 .quad 0 102 .quad 0 103 .quad 0 104 .quad 0 105 106section_table: 107 /* We need a .reloc section for EFI */ 108 .ascii ".reloc" 109 .byte 0 110 .byte 0 /* Pad to 8 bytes */ 111 .long 0 /* Virtual size */ 112 .long 0 /* Virtual address */ 113 .long 0 /* Size of raw data */ 114 .long 0 /* Pointer to raw data */ 115 .long 0 /* Pointer to relocations */ 116 .long 0 /* Pointer to line numbers */ 117 .short 0 /* Number of relocations */ 118 .short 0 /* Number of line numbers */ 119 .long (IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | \ 120 IMAGE_SCN_MEM_DISCARDABLE) /* Characteristics */ 121 122 /* The contents of the loader */ 123 .ascii ".text" 124 .byte 0 125 .byte 0 126 .byte 0 /* Pad to 8 bytes */ 127 .long _edata - _end_header /* Virtual size */ 128 .long _end_header - efi_start /* Virtual address */ 129 .long _edata - _end_header /* Size of raw data */ 130 .long _end_header - efi_start /* Pointer to raw data */ 131 .long 0 /* Pointer to relocations */ 132 .long 0 /* Pointer to line numbers */ 133 .short 0 /* Number of relocations */ 134 .short 0 /* Number of line numbers */ 135 .long (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | \ 136 IMAGE_SCN_MEM_READ) /* Characteristics */ 137_end_header: 138 139 .text 140 .globl _start 141_start: 142 /* Save the boot params to the stack */ 143 stp x0, x1, [sp, #-16]! 144 145 adrp x0, __bss_start 146 add x0, x0, :lo12:__bss_start 147 adrp x1, __bss_end 148 add x1, x1, :lo12:__bss_end 149 150 b 2f 151 1521: 153 stp xzr, xzr, [x0], #16 1542: 155 cmp x0, x1 156 b.lo 1b 157 158 adrp x0, ImageBase 159 add x0, x0, :lo12:ImageBase 160 adrp x1, _DYNAMIC 161 add x1, x1, :lo12:_DYNAMIC 162 163 bl self_reloc 164 165 ldp x0, x1, [sp], #16 166 167#ifndef EFI_BOOT1 168 /* 169 * Load the stack to use. The default stack may be too small for 170 * the lua loader. 171 */ 172 adrp x2, initstack_end 173 add x2, x2, :lo12:initstack_end 174 mov sp, x2 175#endif 176 177 bl efi_main 178 1791: b 1b 180 181#ifndef EFI_BOOT1 182.bss 183 .align 4 184initstack: 185 .space (64 * 1024) 186initstack_end: 187#endif 188