arch/arm/boot/compressed/efi-header.S

   1 /*
   2  * Copyright (C) 2013-2015 Linaro Ltd
   3  * Authors: Roy Franz <roy.franz@linaro.org>
   4  *          Ard Biesheuvel <ard.biesheuvel@linaro.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11                 .macro  __nop
  12 #ifdef CONFIG_EFI_STUB
  13                 @ This is almost but not quite a NOP, since it does clobber the
  14                 @ condition flags. But it is the best we can do for EFI, since
  15                 @ PE/COFF expects the magic string "MZ" at offset 0, while the
  16                 @ ARM/Linux boot protocol expects an executable instruction
  17                 @ there.
  18                 .inst   'M' | ('Z' << 8) | (0x1310 << 16)   @ tstne r0, #0x4d000
  19 #else
  20                 mov     r0, r0
  21 #endif
  22                 .endm
  23
  24                 .macro  __EFI_HEADER
  25 #ifdef CONFIG_EFI_STUB
  26                 b       __efi_start
  27
  28                 .set    start_offset, __efi_start - start
  29                 .org    start + 0x3c
  30                 @
  31                 @ The PE header can be anywhere in the file, but for
  32                 @ simplicity we keep it together with the MSDOS header
  33                 @ The offset to the PE/COFF header needs to be at offset
  34                 @ 0x3C in the MSDOS header.
  35                 @ The only 2 fields of the MSDOS header that are used are this
  36                 @ PE/COFF offset, and the "MZ" bytes at offset 0x0.
  37                 @
  38                 .long   pe_header - start       @ Offset to the PE header.
  39
  40 pe_header:
  41                 .ascii  "PE\0\0"
  42
  43 coff_header:
  44                 .short  0x01c2                  @ ARM or Thumb
  45                 .short  2                       @ nr_sections
  46                 .long   0                       @ TimeDateStamp
  47                 .long   0                       @ PointerToSymbolTable
  48                 .long   1                       @ NumberOfSymbols
  49                 .short  section_table - optional_header
  50                                                 @ SizeOfOptionalHeader
  51                 .short  0x306                   @ Characteristics.
  52                                                 @ IMAGE_FILE_32BIT_MACHINE |
  53                                                 @ IMAGE_FILE_DEBUG_STRIPPED |
  54                                                 @ IMAGE_FILE_EXECUTABLE_IMAGE |
  55                                                 @ IMAGE_FILE_LINE_NUMS_STRIPPED
  56
  57 optional_header:
  58                 .short  0x10b                   @ PE32 format
  59                 .byte   0x02                    @ MajorLinkerVersion
  60                 .byte   0x14                    @ MinorLinkerVersion
  61                 .long   _end - __efi_start      @ SizeOfCode
  62                 .long   0                       @ SizeOfInitializedData
  63                 .long   0                       @ SizeOfUninitializedData
  64                 .long   efi_stub_entry - start  @ AddressOfEntryPoint
  65                 .long   start_offset            @ BaseOfCode
  66                 .long   0                       @ data
  67
  68 extra_header_fields:
  69                 .long   0                       @ ImageBase
  70                 .long   0x200                   @ SectionAlignment
  71                 .long   0x200                   @ FileAlignment
  72                 .short  0                       @ MajorOperatingSystemVersion
  73                 .short  0                       @ MinorOperatingSystemVersion
  74                 .short  0                       @ MajorImageVersion
  75                 .short  0                       @ MinorImageVersion
  76                 .short  0                       @ MajorSubsystemVersion
  77                 .short  0                       @ MinorSubsystemVersion
  78                 .long   0                       @ Win32VersionValue
  79
  80                 .long   _end - start            @ SizeOfImage
  81                 .long   start_offset            @ SizeOfHeaders
  82                 .long   0                       @ CheckSum
  83                 .short  0xa                     @ Subsystem (EFI application)
  84                 .short  0                       @ DllCharacteristics
  85                 .long   0                       @ SizeOfStackReserve
  86                 .long   0                       @ SizeOfStackCommit
  87                 .long   0                       @ SizeOfHeapReserve
  88                 .long   0                       @ SizeOfHeapCommit
  89                 .long   0                       @ LoaderFlags
  90                 .long   0x6                     @ NumberOfRvaAndSizes
  91
  92                 .quad   0                       @ ExportTable
  93                 .quad   0                       @ ImportTable
  94                 .quad   0                       @ ResourceTable
  95                 .quad   0                       @ ExceptionTable
  96                 .quad   0                       @ CertificationTable
  97                 .quad   0                       @ BaseRelocationTable
  98
  99 section_table:
 100                 @
 101                 @ The EFI application loader requires a relocation section
 102                 @ because EFI applications must be relocatable. This is a
 103                 @ dummy section as far as we are concerned.
 104                 @
 105                 .ascii  ".reloc\0\0"
 106                 .long   0                       @ VirtualSize
 107                 .long   0                       @ VirtualAddress
 108                 .long   0                       @ SizeOfRawData
 109                 .long   0                       @ PointerToRawData
 110                 .long   0                       @ PointerToRelocations
 111                 .long   0                       @ PointerToLineNumbers
 112                 .short  0                       @ NumberOfRelocations
 113                 .short  0                       @ NumberOfLineNumbers
 114                 .long   0x42100040              @ Characteristics
 115
 116                 .ascii  ".text\0\0\0"
 117                 .long   _end - __efi_start      @ VirtualSize
 118                 .long   __efi_start             @ VirtualAddress
 119                 .long   _edata - __efi_start    @ SizeOfRawData
 120                 .long   __efi_start             @ PointerToRawData
 121                 .long   0                       @ PointerToRelocations
 122                 .long   0                       @ PointerToLineNumbers
 123                 .short  0                       @ NumberOfRelocations
 124                 .short  0                       @ NumberOfLineNumbers
 125                 .long   0xe0500020              @ Characteristics
 126
 127                 .align  9
 128 __efi_start:
 129 #endif
 130                 .endm