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  AR_CLASS(      mov     r0, r0          )
  21   M_CLASS(      nop.w                   )
  22 #endif
  23                 .endm
  24
  25                 .macro  __EFI_HEADER
  26 #ifdef CONFIG_EFI_STUB
  27                 .set    start_offset, __efi_start - start
  28                 .org    start + 0x3c
  29                 @
  30                 @ The PE header can be anywhere in the file, but for
  31                 @ simplicity we keep it together with the MSDOS header
  32                 @ The offset to the PE/COFF header needs to be at offset
  33                 @ 0x3C in the MSDOS header.
  34                 @ The only 2 fields of the MSDOS header that are used are this
  35                 @ PE/COFF offset, and the "MZ" bytes at offset 0x0.
  36                 @
  37                 .long   pe_header - start       @ Offset to the PE header.
  38
  39 pe_header:
  40                 .ascii  "PE\0\0"
  41
  42 coff_header:
  43                 .short  0x01c2                  @ ARM or Thumb
  44                 .short  2                       @ nr_sections
  45                 .long   0                       @ TimeDateStamp
  46                 .long   0                       @ PointerToSymbolTable
  47                 .long   1                       @ NumberOfSymbols
  48                 .short  section_table - optional_header
  49                                                 @ SizeOfOptionalHeader
  50                 .short  0x306                   @ Characteristics.
  51                                                 @ IMAGE_FILE_32BIT_MACHINE |
  52                                                 @ IMAGE_FILE_DEBUG_STRIPPED |
  53                                                 @ IMAGE_FILE_EXECUTABLE_IMAGE |
  54                                                 @ IMAGE_FILE_LINE_NUMS_STRIPPED
  55
  56 optional_header:
  57                 .short  0x10b                   @ PE32 format
  58                 .byte   0x02                    @ MajorLinkerVersion
  59                 .byte   0x14                    @ MinorLinkerVersion
  60                 .long   _end - __efi_start      @ SizeOfCode
  61                 .long   0                       @ SizeOfInitializedData
  62                 .long   0                       @ SizeOfUninitializedData
  63                 .long   efi_stub_entry - start  @ AddressOfEntryPoint
  64                 .long   start_offset            @ BaseOfCode
  65                 .long   0                       @ data
  66
  67 extra_header_fields:
  68                 .long   0                       @ ImageBase
  69                 .long   0x200                   @ SectionAlignment
  70                 .long   0x200                   @ FileAlignment
  71                 .short  0                       @ MajorOperatingSystemVersion
  72                 .short  0                       @ MinorOperatingSystemVersion
  73                 .short  0                       @ MajorImageVersion
  74                 .short  0                       @ MinorImageVersion
  75                 .short  0                       @ MajorSubsystemVersion
  76                 .short  0                       @ MinorSubsystemVersion
  77                 .long   0                       @ Win32VersionValue
  78
  79                 .long   _end - start            @ SizeOfImage
  80                 .long   start_offset            @ SizeOfHeaders
  81                 .long   0                       @ CheckSum
  82                 .short  0xa                     @ Subsystem (EFI application)
  83                 .short  0                       @ DllCharacteristics
  84                 .long   0                       @ SizeOfStackReserve
  85                 .long   0                       @ SizeOfStackCommit
  86                 .long   0                       @ SizeOfHeapReserve
  87                 .long   0                       @ SizeOfHeapCommit
  88                 .long   0                       @ LoaderFlags
  89                 .long   0x6                     @ NumberOfRvaAndSizes
  90
  91                 .quad   0                       @ ExportTable
  92                 .quad   0                       @ ImportTable
  93                 .quad   0                       @ ResourceTable
  94                 .quad   0                       @ ExceptionTable
  95                 .quad   0                       @ CertificationTable
  96                 .quad   0                       @ BaseRelocationTable
  97
  98 section_table:
  99                 @
 100                 @ The EFI application loader requires a relocation section
 101                 @ because EFI applications must be relocatable. This is a
 102                 @ dummy section as far as we are concerned.
 103                 @
 104                 .ascii  ".reloc\0\0"
 105                 .long   0                       @ VirtualSize
 106                 .long   0                       @ VirtualAddress
 107                 .long   0                       @ SizeOfRawData
 108                 .long   0                       @ PointerToRawData
 109                 .long   0                       @ PointerToRelocations
 110                 .long   0                       @ PointerToLineNumbers
 111                 .short  0                       @ NumberOfRelocations
 112                 .short  0                       @ NumberOfLineNumbers
 113                 .long   0x42100040              @ Characteristics
 114
 115                 .ascii  ".text\0\0\0"
 116                 .long   _end - __efi_start      @ VirtualSize
 117                 .long   __efi_start             @ VirtualAddress
 118                 .long   _edata - __efi_start    @ SizeOfRawData
 119                 .long   __efi_start             @ PointerToRawData
 120                 .long   0                       @ PointerToRelocations
 121                 .long   0                       @ PointerToLineNumbers
 122                 .short  0                       @ NumberOfRelocations
 123                 .short  0                       @ NumberOfLineNumbers
 124                 .long   0xe0500020              @ Characteristics
 125
 126                 .align  9
 127 __efi_start:
 128 #endif
 129                 .endm