arch/arm64/kernel/efi-header.S

   1 /*
   2  * Copyright (C) 2013 - 2017 Linaro, Ltd.
   3  * Copyright (C) 2013, 2014 Red Hat, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10         .macro  __EFI_PE_HEADER
  11         .ascii  "PE"
  12         .short  0
  13 coff_header:
  14         .short  0xaa64                                  // AArch64
  15         .short  2                                       // nr_sections
  16         .long   0                                       // TimeDateStamp
  17         .long   0                                       // PointerToSymbolTable
  18         .long   1                                       // NumberOfSymbols
  19         .short  section_table - optional_header         // SizeOfOptionalHeader
  20         .short  0x206                                   // Characteristics.
  21                                                         // IMAGE_FILE_DEBUG_STRIPPED |
  22                                                         // IMAGE_FILE_EXECUTABLE_IMAGE |
  23                                                         // IMAGE_FILE_LINE_NUMS_STRIPPED
  24 optional_header:
  25         .short  0x20b                                   // PE32+ format
  26         .byte   0x02                                    // MajorLinkerVersion
  27         .byte   0x14                                    // MinorLinkerVersion
  28         .long   _end - efi_header_end                   // SizeOfCode
  29         .long   0                                       // SizeOfInitializedData
  30         .long   0                                       // SizeOfUninitializedData
  31         .long   __efistub_entry - _head                 // AddressOfEntryPoint
  32         .long   efi_header_end - _head                  // BaseOfCode
  33
  34 extra_header_fields:
  35         .quad   0                                       // ImageBase
  36         .long   0x1000                                  // SectionAlignment
  37         .long   PECOFF_FILE_ALIGNMENT                   // FileAlignment
  38         .short  0                                       // MajorOperatingSystemVersion
  39         .short  0                                       // MinorOperatingSystemVersion
  40         .short  0                                       // MajorImageVersion
  41         .short  0                                       // MinorImageVersion
  42         .short  0                                       // MajorSubsystemVersion
  43         .short  0                                       // MinorSubsystemVersion
  44         .long   0                                       // Win32VersionValue
  45
  46         .long   _end - _head                            // SizeOfImage
  47
  48         // Everything before the kernel image is considered part of the header
  49         .long   efi_header_end - _head                  // SizeOfHeaders
  50         .long   0                                       // CheckSum
  51         .short  0xa                                     // Subsystem (EFI application)
  52         .short  0                                       // DllCharacteristics
  53         .quad   0                                       // SizeOfStackReserve
  54         .quad   0                                       // SizeOfStackCommit
  55         .quad   0                                       // SizeOfHeapReserve
  56         .quad   0                                       // SizeOfHeapCommit
  57         .long   0                                       // LoaderFlags
  58         .long   (section_table - .) / 8                 // NumberOfRvaAndSizes
  59
  60         .quad   0                                       // ExportTable
  61         .quad   0                                       // ImportTable
  62         .quad   0                                       // ResourceTable
  63         .quad   0                                       // ExceptionTable
  64         .quad   0                                       // CertificationTable
  65         .quad   0                                       // BaseRelocationTable
  66
  67 #ifdef CONFIG_DEBUG_EFI
  68         .long   efi_debug_table - _head                 // DebugTable
  69         .long   efi_debug_table_size
  70 #endif
  71
  72         // Section table
  73 section_table:
  74
  75         /*
  76          * The EFI application loader requires a relocation section
  77          * because EFI applications must be relocatable.  This is a
  78          * dummy section as far as we are concerned.
  79          */
  80         .ascii  ".reloc"
  81         .byte   0
  82         .byte   0                                       // end of 0 padding of section name
  83         .long   0
  84         .long   0
  85         .long   0                                       // SizeOfRawData
  86         .long   0                                       // PointerToRawData
  87         .long   0                                       // PointerToRelocations
  88         .long   0                                       // PointerToLineNumbers
  89         .short  0                                       // NumberOfRelocations
  90         .short  0                                       // NumberOfLineNumbers
  91         .long   0x42100040                              // Characteristics (section flags)
  92
  93
  94         .ascii  ".text"
  95         .byte   0
  96         .byte   0
  97         .byte   0                                       // end of 0 padding of section name
  98         .long   _end - efi_header_end                   // VirtualSize
  99         .long   efi_header_end - _head                  // VirtualAddress
 100         .long   _edata - efi_header_end                 // SizeOfRawData
 101         .long   efi_header_end - _head                  // PointerToRawData
 102
 103         .long   0                                       // PointerToRelocations
 104         .long   0                                       // PointerToLineNumbers
 105         .short  0                                       // NumberOfRelocations
 106         .short  0                                       // NumberOfLineNumbers
 107         .long   0xe0500020                              // Characteristics
 108
 109 #ifdef CONFIG_DEBUG_EFI
 110         /*
 111          * The debug table is referenced via its Relative Virtual Address (RVA),
 112          * which is only defined for those parts of the image that are covered
 113          * by a section declaration. Since this header is not covered by any
 114          * section, the debug table must be emitted elsewhere. So stick it in
 115          * the .init.rodata section instead.
 116          *
 117          * Note that the EFI debug entry itself may legally have a zero RVA,
 118          * which means we can simply put it right after the section headers.
 119          */
 120         __INITRODATA
 121
 122         .align  2
 123 efi_debug_table:
 124         // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY
 125         .long   0                                       // Characteristics
 126         .long   0                                       // TimeDateStamp
 127         .short  0                                       // MajorVersion
 128         .short  0                                       // MinorVersion
 129         .long   2                                       // Type == EFI_IMAGE_DEBUG_TYPE_CODEVIEW
 130         .long   efi_debug_entry_size                    // SizeOfData
 131         .long   0                                       // RVA
 132         .long   efi_debug_entry - _head                 // FileOffset
 133
 134         .set    efi_debug_table_size, . - efi_debug_table
 135         .previous
 136
 137 efi_debug_entry:
 138         // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY
 139         .ascii  "NB10"                                  // Signature
 140         .long   0                                       // Unknown
 141         .long   0                                       // Unknown2
 142         .long   0                                       // Unknown3
 143
 144         .asciz  VMLINUX_PATH
 145
 146         .set    efi_debug_entry_size, . - efi_debug_entry
 147 #endif
 148
 149         /*
 150          * EFI will load .text onwards at the 4k section alignment
 151          * described in the PE/COFF header. To ensure that instruction
 152          * sequences using an adrp and a :lo12: immediate will function
 153          * correctly at this alignment, we must ensure that .text is
 154          * placed at a 4k boundary in the Image to begin with.
 155          */
 156         .align 12
 157 efi_header_end:
 158         .endm