1/*- 2 * Copyright (c) 2014, 2015 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 27#include <machine/asm.h> 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 arm we need to do 32 * it ourselves. 33 */ 34 35#define IMAGE_FILE_MACHINE_ARM 0x01c2 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_ARM /* ARM 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 0x010b /* PE32 (32-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 .long 0 /* Start of data */ 75 76optional_windows_header: 77 .long 0 /* Image base */ 78 .long 32 /* Section Alignment */ 79 .long 8 /* File alignment */ 80 .short 0 /* Major OS version */ 81 .short 0 /* Minor OS version */ 82 .short 0 /* Major image version */ 83 .short 0 /* Minor image version */ 84 .short 0 /* Major subsystem version */ 85 .short 0 /* Minor subsystem version */ 86 .long 0 /* Win32 version */ 87 .long _edata - efi_start /* Image size */ 88 .long _end_header - efi_start /* Header size */ 89 .long 0 /* Checksum */ 90 .short 0xa /* Subsystem (EFI app) */ 91 .short 0 /* DLL Characteristics */ 92 .long 0 /* Stack reserve */ 93 .long 0 /* Stack commit */ 94 .long 0 /* Heap reserve */ 95 .long 0 /* Heap commit */ 96 .long 0 /* Loader flags */ 97 .long 6 /* Number of RVAs */ 98 99 /* RVAs: */ 100 .quad 0 101 .quad 0 102 .quad 0 103 .quad 0 104 .quad 0 105 .quad 0 106 107section_table: 108 /* We need a .reloc section for EFI */ 109 .ascii ".reloc" 110 .byte 0 111 .byte 0 /* Pad to 8 bytes */ 112 .long 0 /* Virtual size */ 113 .long 0 /* Virtual address */ 114 .long 0 /* Size of raw data */ 115 .long 0 /* Pointer to raw data */ 116 .long 0 /* Pointer to relocations */ 117 .long 0 /* Pointer to line numbers */ 118 .short 0 /* Number of relocations */ 119 .short 0 /* Number of line numbers */ 120 .long (IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | \ 121 IMAGE_SCN_MEM_DISCARDABLE) /* Characteristics */ 122 123 /* The contents of the loader */ 124 .ascii ".text" 125 .byte 0 126 .byte 0 127 .byte 0 /* Pad to 8 bytes */ 128 .long _edata - _end_header /* Virtual size */ 129 .long _end_header - efi_start /* Virtual address */ 130 .long _edata - _end_header /* Size of raw data */ 131 .long _end_header - efi_start /* Pointer to raw data */ 132 .long 0 /* Pointer to relocations */ 133 .long 0 /* Pointer to line numbers */ 134 .short 0 /* Number of relocations */ 135 .short 0 /* Number of line numbers */ 136 .long (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | \ 137 IMAGE_SCN_MEM_READ) /* Characteristics */ 138_end_header: 139 140 .text 141 .globl _start 142_start: 143 /* Save the boot params to the stack */ 144 push {r0, r1} 145 146 adr r0, .Lbase 147 ldr r1, [r0] 148 sub r5, r0, r1 149 150 ldr r0, .Limagebase 151 add r0, r0, r5 152 ldr r1, .Ldynamic 153 add r1, r1, r5 154 155 bl _C_LABEL(self_reloc) 156 157 /* Zero the BSS, _reloc fixed the values for us */ 158 ldr r0, .Lbss 159 ldr r1, .Lbssend 160 mov r2, #0 161 1621: cmp r0, r1 163 bge 2f 164 str r2, [r0], #4 165 b 1b 1662: 167 168 pop {r0, r1} 169 bl _C_LABEL(efi_main) 170 1711: b 1b 172 173.Lbase: 174 .word . 175.Limagebase: 176 .word ImageBase 177.Ldynamic: 178 .word _DYNAMIC 179.Lbss: 180 .word __bss_start 181.Lbssend: 182 .word __bss_end 183 184.align 3 185stack: 186 .space 512 187stack_end: 188 189