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

   1 /*
   2  * Copyright (C) 2013-2017 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 #include <linux/pe.h>
  12 #include <linux/sizes.h>
  13
  14                 .macro  __nop
  15 #ifdef CONFIG_EFI_STUB
  16                 @ This is almost but not quite a NOP, since it does clobber the
  17                 @ condition flags. But it is the best we can do for EFI, since
  18                 @ PE/COFF expects the magic string "MZ" at offset 0, while the
  19                 @ ARM/Linux boot protocol expects an executable instruction
  20                 @ there.
  21                 .inst   MZ_MAGIC | (0x1310 << 16)       @ tstne r0, #0x4d000
  22 #else
  23  AR_CLASS(      mov     r0, r0          )
  24   M_CLASS(      nop.w                   )
  25 #endif
  26                 .endm
  27
  28                 .macro  __EFI_HEADER
  29 #ifdef CONFIG_EFI_STUB
  30                 .set    start_offset, __efi_start - start
  31                 .org    start + 0x3c
  32                 @
  33                 @ The PE header can be anywhere in the file, but for
  34                 @ simplicity we keep it together with the MSDOS header
  35                 @ The offset to the PE/COFF header needs to be at offset
  36                 @ 0x3C in the MSDOS header.
  37                 @ The only 2 fields of the MSDOS header that are used are this
  38                 @ PE/COFF offset, and the "MZ" bytes at offset 0x0.
  39                 @
  40                 .long   pe_header - start               @ Offset to the PE header.
  41
  42 pe_header:
  43                 .long   PE_MAGIC
  44
  45 coff_header:
  46                 .short  IMAGE_FILE_MACHINE_THUMB        @ Machine
  47                 .short  section_count                   @ NumberOfSections
  48                 .long   0                               @ TimeDateStamp
  49                 .long   0                               @ PointerToSymbolTable
  50                 .long   0                               @ NumberOfSymbols
  51                 .short  section_table - optional_header @ SizeOfOptionalHeader
  52                 .short  IMAGE_FILE_32BIT_MACHINE | \
  53                         IMAGE_FILE_DEBUG_STRIPPED | \
  54                         IMAGE_FILE_EXECUTABLE_IMAGE | \
  55                         IMAGE_FILE_LINE_NUMS_STRIPPED   @ Characteristics
  56
  57 optional_header:
  58                 .short  PE_OPT_MAGIC_PE32               @ 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                               @ BaseOfData
  67
  68 extra_header_fields:
  69                 .long   0                               @ ImageBase
  70                 .long   SZ_512                          @ SectionAlignment
  71                 .long   SZ_512                          @ FileAlignment
  72                 .short  0                               @ MajorOsVersion
  73                 .short  0                               @ MinorOsVersion
  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  IMAGE_SUBSYSTEM_EFI_APPLICATION @ Subsystem
  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   (section_table - .) / 8         @ 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                 .ascii  ".text\0\0\0"
 101                 .long   _end - __efi_start              @ VirtualSize
 102                 .long   __efi_start                     @ VirtualAddress
 103                 .long   _edata - __efi_start            @ SizeOfRawData
 104                 .long   __efi_start                     @ PointerToRawData
 105                 .long   0                               @ PointerToRelocations
 106                 .long   0                               @ PointerToLineNumbers
 107                 .short  0                               @ NumberOfRelocations
 108                 .short  0                               @ NumberOfLineNumbers
 109                 .long   IMAGE_SCN_CNT_CODE | \
 110                         IMAGE_SCN_MEM_READ | \
 111                         IMAGE_SCN_MEM_WRITE | \
 112                         IMAGE_SCN_MEM_EXECUTE           @ Characteristics
 113
 114                 .set    section_count, (. - section_table) / 40
 115
 116                 .align  9
 117 __efi_start:
 118 #endif
 119                 .endm