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  1                                       // nr_sections
  16         .long   0                                       // TimeDateStamp
  17         .long   0                                       // PointerToSymbolTable
  18         .long   0                                       // 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         .ascii  ".text"
  75         .byte   0
  76         .byte   0
  77         .byte   0                                       // end of 0 padding of section name
  78         .long   _end - efi_header_end                   // VirtualSize
  79         .long   efi_header_end - _head                  // VirtualAddress
  80         .long   _edata - efi_header_end                 // SizeOfRawData
  81         .long   efi_header_end - _head                  // PointerToRawData
  82
  83         .long   0                                       // PointerToRelocations
  84         .long   0                                       // PointerToLineNumbers
  85         .short  0                                       // NumberOfRelocations
  86         .short  0                                       // NumberOfLineNumbers
  87         .long   0xe0000020                              // Characteristics
  88
  89 #ifdef CONFIG_DEBUG_EFI
  90         /*
  91          * The debug table is referenced via its Relative Virtual Address (RVA),
  92          * which is only defined for those parts of the image that are covered
  93          * by a section declaration. Since this header is not covered by any
  94          * section, the debug table must be emitted elsewhere. So stick it in
  95          * the .init.rodata section instead.
  96          *
  97          * Note that the EFI debug entry itself may legally have a zero RVA,
  98          * which means we can simply put it right after the section headers.
  99          */
 100         __INITRODATA
 101
 102         .align  2
 103 efi_debug_table:
 104         // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY
 105         .long   0                                       // Characteristics
 106         .long   0                                       // TimeDateStamp
 107         .short  0                                       // MajorVersion
 108         .short  0                                       // MinorVersion
 109         .long   2                                       // Type == EFI_IMAGE_DEBUG_TYPE_CODEVIEW
 110         .long   efi_debug_entry_size                    // SizeOfData
 111         .long   0                                       // RVA
 112         .long   efi_debug_entry - _head                 // FileOffset
 113
 114         .set    efi_debug_table_size, . - efi_debug_table
 115         .previous
 116
 117 efi_debug_entry:
 118         // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY
 119         .ascii  "NB10"                                  // Signature
 120         .long   0                                       // Unknown
 121         .long   0                                       // Unknown2
 122         .long   0                                       // Unknown3
 123
 124         .asciz  VMLINUX_PATH
 125
 126         .set    efi_debug_entry_size, . - efi_debug_entry
 127 #endif
 128
 129         /*
 130          * EFI will load .text onwards at the 4k section alignment
 131          * described in the PE/COFF header. To ensure that instruction
 132          * sequences using an adrp and a :lo12: immediate will function
 133          * correctly at this alignment, we must ensure that .text is
 134          * placed at a 4k boundary in the Image to begin with.
 135          */
 136         .align 12
 137 efi_header_end:
 138         .endm