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 * $FreeBSD$ 27 */ 28 29 #include <machine/asm.h> 30 31 /* 32 * We need to be a PE32 file for EFI. On some architectures we can use 33 * objcopy to create the correct file, however on arm we need to do 34 * it ourselves. 35 */ 36 37 #define IMAGE_FILE_MACHINE_ARM 0x01c2 38 39 #define IMAGE_SCN_CNT_CODE 0x00000020 40 #define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040 41 #define IMAGE_SCN_MEM_DISCARDABLE 0x02000000 42 #define IMAGE_SCN_MEM_EXECUTE 0x20000000 43 #define IMAGE_SCN_MEM_READ 0x40000000 44 45 .section .peheader 46 efi_start: 47 /* The MS-DOS Stub, only used to get the offset of the COFF header */ 48 .ascii "MZ" 49 .short 0 50 .space 0x38 51 .long pe_sig - efi_start 52 53 /* The PE32 Signature. Needs to be 8-byte aligned */ 54 .align 3 55 pe_sig: 56 .ascii "PE" 57 .short 0 58 coff_head: 59 .short IMAGE_FILE_MACHINE_ARM /* ARM file */ 60 .short 2 /* 2 Sections */ 61 .long 0 /* Timestamp */ 62 .long 0 /* No symbol table */ 63 .long 0 /* No symbols */ 64 .short section_table - optional_header /* Optional header size */ 65 .short 0 /* Characteristics TODO: Fill in */ 66 67 optional_header: 68 .short 0x010b /* PE32 (32-bit addressing) */ 69 .byte 0 /* Major linker version */ 70 .byte 0 /* Minor linker version */ 71 .long _edata - _end_header /* Code size */ 72 .long 0 /* No initialized data */ 73 .long 0 /* No uninitialized data */ 74 .long _start - efi_start /* Entry point */ 75 .long _end_header - efi_start /* Start of code */ 76 .long 0 /* Start of data */ 77 78 optional_windows_header: 79 .long 0 /* Image base */ 80 .long 32 /* Section Alignment */ 81 .long 8 /* File alignment */ 82 .short 0 /* Major OS version */ 83 .short 0 /* Minor OS version */ 84 .short 0 /* Major image version */ 85 .short 0 /* Minor image version */ 86 .short 0 /* Major subsystem version */ 87 .short 0 /* Minor subsystem version */ 88 .long 0 /* Win32 version */ 89 .long _edata - efi_start /* Image size */ 90 .long _end_header - efi_start /* Header size */ 91 .long 0 /* Checksum */ 92 .short 0xa /* Subsystem (EFI app) */ 93 .short 0 /* DLL Characteristics */ 94 .long 0 /* Stack reserve */ 95 .long 0 /* Stack commit */ 96 .long 0 /* Heap reserve */ 97 .long 0 /* Heap commit */ 98 .long 0 /* Loader flags */ 99 .long 6 /* Number of RVAs */ 100 101 /* RVAs: */ 102 .quad 0 103 .quad 0 104 .quad 0 105 .quad 0 106 .quad 0 107 .quad 0 108 109 section_table: 110 /* We need a .reloc section for EFI */ 111 .ascii ".reloc" 112 .byte 0 113 .byte 0 /* Pad to 8 bytes */ 114 .long 0 /* Virtual size */ 115 .long 0 /* Virtual address */ 116 .long 0 /* Size of raw data */ 117 .long 0 /* Pointer to raw data */ 118 .long 0 /* Pointer to relocations */ 119 .long 0 /* Pointer to line numbers */ 120 .short 0 /* Number of relocations */ 121 .short 0 /* Number of line numbers */ 122 .long (IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | \ 123 IMAGE_SCN_MEM_DISCARDABLE) /* Characteristics */ 124 125 /* The contents of the loader */ 126 .ascii ".text" 127 .byte 0 128 .byte 0 129 .byte 0 /* Pad to 8 bytes */ 130 .long _edata - _end_header /* Virtual size */ 131 .long _end_header - efi_start /* Virtual address */ 132 .long _edata - _end_header /* Size of raw data */ 133 .long _end_header - efi_start /* Pointer to raw data */ 134 .long 0 /* Pointer to relocations */ 135 .long 0 /* Pointer to line numbers */ 136 .short 0 /* Number of relocations */ 137 .short 0 /* Number of line numbers */ 138 .long (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | \ 139 IMAGE_SCN_MEM_READ) /* Characteristics */ 140 _end_header: 141 142 .text 143 _start: 144 /* Save the boot params to the stack */ 145 push {r0, r1} 146 147 adr r0, .Lbase 148 ldr r1, [r0] 149 sub r5, r0, r1 150 151 ldr r0, .Limagebase 152 add r0, r0, r5 153 ldr r1, .Ldynamic 154 add r1, r1, r5 155 156 bl _C_LABEL(self_reloc) 157 158 /* Zero the BSS, _reloc fixed the values for us */ 159 ldr r0, .Lbss 160 ldr r1, .Lbssend 161 mov r2, #0 162 163 1: cmp r0, r1 164 bgt 2f 165 str r2, [r0], #4 166 b 1b 167 2: 168 169 pop {r0, r1} 170 bl _C_LABEL(efi_main) 171 172 1: b 1b 173 174 .Lbase: 175 .word . 176 .Limagebase: 177 .word ImageBase 178 .Ldynamic: 179 .word _DYNAMIC 180 .Lbss: 181 .word __bss_start 182 .Lbssend: 183 .word __bss_end 184 185 .align 3 186 stack: 187 .space 512 188 stack_end: 189 190