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

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2013-2017 Linaro Ltd
   4  * Authors: Roy Franz <roy.franz@linaro.org>
   5  *          Ard Biesheuvel <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <linux/pe.h>
   9 #include <linux/sizes.h>
  10
  11                 .macro  __nop
  12  AR_CLASS(      mov     r0, r0          )
  13   M_CLASS(      nop.w                   )
  14                 .endm
  15
  16                 .macro __initial_nops
  17 #ifdef CONFIG_EFI_STUB
  18                 @ This is a two-instruction NOP, which happens to bear the
  19                 @ PE/COFF signature "MZ" in the first two bytes, so the kernel
  20                 @ is accepted as an EFI binary. Booting via the UEFI stub
  21                 @ will not execute those instructions, but the ARM/Linux
  22                 @ boot protocol does, so we need some NOPs here.
  23                 .inst   MZ_MAGIC | (0xe225 << 16)       @ eor r5, r5, 0x4d000
  24                 eor     r5, r5, 0x4d000                 @ undo previous insn
  25 #else
  26                 __nop
  27                 __nop
  28 #endif
  29                 .endm
  30
  31                 .macro  __EFI_HEADER
  32 #ifdef CONFIG_EFI_STUB
  33                 .set    start_offset, __efi_start - start
  34                 .org    start + 0x3c
  35                 @
  36                 @ The PE header can be anywhere in the file, but for
  37                 @ simplicity we keep it together with the MSDOS header
  38                 @ The offset to the PE/COFF header needs to be at offset
  39                 @ 0x3C in the MSDOS header.
  40                 @ The only 2 fields of the MSDOS header that are used are this
  41                 @ PE/COFF offset, and the "MZ" bytes at offset 0x0.
  42                 @
  43                 .long   pe_header - start               @ Offset to the PE header.
  44
  45 pe_header:
  46                 .long   PE_MAGIC
  47
  48 coff_header:
  49                 .short  IMAGE_FILE_MACHINE_THUMB        @ Machine
  50                 .short  section_count                   @ NumberOfSections
  51                 .long   0                               @ TimeDateStamp
  52                 .long   0                               @ PointerToSymbolTable
  53                 .long   0                               @ NumberOfSymbols
  54                 .short  section_table - optional_header @ SizeOfOptionalHeader
  55                 .short  IMAGE_FILE_32BIT_MACHINE | \
  56                         IMAGE_FILE_DEBUG_STRIPPED | \
  57                         IMAGE_FILE_EXECUTABLE_IMAGE | \
  58                         IMAGE_FILE_LINE_NUMS_STRIPPED   @ Characteristics
  59
  60 #define __pecoff_code_size (__pecoff_data_start - __efi_start)
  61
  62 optional_header:
  63                 .short  PE_OPT_MAGIC_PE32               @ PE32 format
  64                 .byte   0x02                            @ MajorLinkerVersion
  65                 .byte   0x14                            @ MinorLinkerVersion
  66                 .long   __pecoff_code_size              @ SizeOfCode
  67                 .long   __pecoff_data_size              @ SizeOfInitializedData
  68                 .long   0                               @ SizeOfUninitializedData
  69                 .long   efi_stub_entry - start          @ AddressOfEntryPoint
  70                 .long   start_offset                    @ BaseOfCode
  71                 .long   __pecoff_data_start - start     @ BaseOfData
  72
  73 extra_header_fields:
  74                 .long   0                               @ ImageBase
  75                 .long   SZ_4K                           @ SectionAlignment
  76                 .long   SZ_512                          @ FileAlignment
  77                 .short  0                               @ MajorOsVersion
  78                 .short  0                               @ MinorOsVersion
  79                 .short  0                               @ MajorImageVersion
  80                 .short  0                               @ MinorImageVersion
  81                 .short  0                               @ MajorSubsystemVersion
  82                 .short  0                               @ MinorSubsystemVersion
  83                 .long   0                               @ Win32VersionValue
  84
  85                 .long   __pecoff_end - start            @ SizeOfImage
  86                 .long   start_offset                    @ SizeOfHeaders
  87                 .long   0                               @ CheckSum
  88                 .short  IMAGE_SUBSYSTEM_EFI_APPLICATION @ Subsystem
  89                 .short  0                               @ DllCharacteristics
  90                 .long   0                               @ SizeOfStackReserve
  91                 .long   0                               @ SizeOfStackCommit
  92                 .long   0                               @ SizeOfHeapReserve
  93                 .long   0                               @ SizeOfHeapCommit
  94                 .long   0                               @ LoaderFlags
  95                 .long   (section_table - .) / 8         @ NumberOfRvaAndSizes
  96
  97                 .quad   0                               @ ExportTable
  98                 .quad   0                               @ ImportTable
  99                 .quad   0                               @ ResourceTable
 100                 .quad   0                               @ ExceptionTable
 101                 .quad   0                               @ CertificationTable
 102                 .quad   0                               @ BaseRelocationTable
 103
 104 section_table:
 105                 .ascii  ".text\0\0\0"
 106                 .long   __pecoff_code_size              @ VirtualSize
 107                 .long   __efi_start                     @ VirtualAddress
 108                 .long   __pecoff_code_size              @ SizeOfRawData
 109                 .long   __efi_start                     @ PointerToRawData
 110                 .long   0                               @ PointerToRelocations
 111                 .long   0                               @ PointerToLineNumbers
 112                 .short  0                               @ NumberOfRelocations
 113                 .short  0                               @ NumberOfLineNumbers
 114                 .long   IMAGE_SCN_CNT_CODE | \
 115                         IMAGE_SCN_MEM_READ | \
 116                         IMAGE_SCN_MEM_EXECUTE           @ Characteristics
 117
 118                 .ascii  ".data\0\0\0"
 119                 .long   __pecoff_data_size              @ VirtualSize
 120                 .long   __pecoff_data_start - start     @ VirtualAddress
 121                 .long   __pecoff_data_rawsize           @ SizeOfRawData
 122                 .long   __pecoff_data_start - start     @ PointerToRawData
 123                 .long   0                               @ PointerToRelocations
 124                 .long   0                               @ PointerToLineNumbers
 125                 .short  0                               @ NumberOfRelocations
 126                 .short  0                               @ NumberOfLineNumbers
 127                 .long   IMAGE_SCN_CNT_INITIALIZED_DATA | \
 128                         IMAGE_SCN_MEM_READ | \
 129                         IMAGE_SCN_MEM_WRITE             @ Characteristics
 130
 131                 .set    section_count, (. - section_table) / 40
 132
 133                 .align  12
 134 __efi_start:
 135 #endif
 136                 .endm