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 #include <linux/pe.h>
  11 #include <linux/sizes.h>
  12
  13         .macro  __EFI_PE_HEADER
  14         .long   PE_MAGIC
  15 coff_header:
  16         .short  IMAGE_FILE_MACHINE_ARM64                // Machine
  17         .short  section_count                           // NumberOfSections
  18         .long   0                                       // TimeDateStamp
  19         .long   0                                       // PointerToSymbolTable
  20         .long   0                                       // NumberOfSymbols
  21         .short  section_table - optional_header         // SizeOfOptionalHeader
  22         .short  IMAGE_FILE_DEBUG_STRIPPED | \
  23                 IMAGE_FILE_EXECUTABLE_IMAGE | \
  24                 IMAGE_FILE_LINE_NUMS_STRIPPED           // Characteristics
  25
  26 optional_header:
  27         .short  PE_OPT_MAGIC_PE32PLUS                   // PE32+ format
  28         .byte   0x02                                    // MajorLinkerVersion
  29         .byte   0x14                                    // MinorLinkerVersion
  30         .long   __initdata_begin - efi_header_end       // SizeOfCode
  31         .long   __pecoff_data_size                      // SizeOfInitializedData
  32         .long   0                                       // SizeOfUninitializedData
  33         .long   __efistub_entry - _head                 // AddressOfEntryPoint
  34         .long   efi_header_end - _head                  // BaseOfCode
  35
  36 extra_header_fields:
  37         .quad   0                                       // ImageBase
  38         .long   SZ_4K                                   // SectionAlignment
  39         .long   PECOFF_FILE_ALIGNMENT                   // FileAlignment
  40         .short  0                                       // MajorOperatingSystemVersion
  41         .short  0                                       // MinorOperatingSystemVersion
  42         .short  0                                       // MajorImageVersion
  43         .short  0                                       // MinorImageVersion
  44         .short  0                                       // MajorSubsystemVersion
  45         .short  0                                       // MinorSubsystemVersion
  46         .long   0                                       // Win32VersionValue
  47
  48         .long   _end - _head                            // SizeOfImage
  49
  50         // Everything before the kernel image is considered part of the header
  51         .long   efi_header_end - _head                  // SizeOfHeaders
  52         .long   0                                       // CheckSum
  53         .short  IMAGE_SUBSYSTEM_EFI_APPLICATION         // Subsystem
  54         .short  0                                       // DllCharacteristics
  55         .quad   0                                       // SizeOfStackReserve
  56         .quad   0                                       // SizeOfStackCommit
  57         .quad   0                                       // SizeOfHeapReserve
  58         .quad   0                                       // SizeOfHeapCommit
  59         .long   0                                       // LoaderFlags
  60         .long   (section_table - .) / 8                 // NumberOfRvaAndSizes
  61
  62         .quad   0                                       // ExportTable
  63         .quad   0                                       // ImportTable
  64         .quad   0                                       // ResourceTable
  65         .quad   0                                       // ExceptionTable
  66         .quad   0                                       // CertificationTable
  67         .quad   0                                       // BaseRelocationTable
  68
  69 #ifdef CONFIG_DEBUG_EFI
  70         .long   efi_debug_table - _head                 // DebugTable
  71         .long   efi_debug_table_size
  72 #endif
  73
  74         // Section table
  75 section_table:
  76         .ascii  ".text\0\0\0"
  77         .long   __initdata_begin - efi_header_end       // VirtualSize
  78         .long   efi_header_end - _head                  // VirtualAddress
  79         .long   __initdata_begin - efi_header_end       // SizeOfRawData
  80         .long   efi_header_end - _head                  // PointerToRawData
  81
  82         .long   0                                       // PointerToRelocations
  83         .long   0                                       // PointerToLineNumbers
  84         .short  0                                       // NumberOfRelocations
  85         .short  0                                       // NumberOfLineNumbers
  86         .long   IMAGE_SCN_CNT_CODE | \
  87                 IMAGE_SCN_MEM_READ | \
  88                 IMAGE_SCN_MEM_EXECUTE                   // Characteristics
  89
  90         .ascii  ".data\0\0\0"
  91         .long   __pecoff_data_size                      // VirtualSize
  92         .long   __initdata_begin - _head                // VirtualAddress
  93         .long   __pecoff_data_rawsize                   // SizeOfRawData
  94         .long   __initdata_begin - _head                // PointerToRawData
  95
  96         .long   0                                       // PointerToRelocations
  97         .long   0                                       // PointerToLineNumbers
  98         .short  0                                       // NumberOfRelocations
  99         .short  0                                       // NumberOfLineNumbers
 100         .long   IMAGE_SCN_CNT_INITIALIZED_DATA | \
 101                 IMAGE_SCN_MEM_READ | \
 102                 IMAGE_SCN_MEM_WRITE                     // Characteristics
 103
 104         .set    section_count, (. - section_table) / 40
 105
 106 #ifdef CONFIG_DEBUG_EFI
 107         /*
 108          * The debug table is referenced via its Relative Virtual Address (RVA),
 109          * which is only defined for those parts of the image that are covered
 110          * by a section declaration. Since this header is not covered by any
 111          * section, the debug table must be emitted elsewhere. So stick it in
 112          * the .init.rodata section instead.
 113          *
 114          * Note that the EFI debug entry itself may legally have a zero RVA,
 115          * which means we can simply put it right after the section headers.
 116          */
 117         __INITRODATA
 118
 119         .align  2
 120 efi_debug_table:
 121         // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY
 122         .long   0                                       // Characteristics
 123         .long   0                                       // TimeDateStamp
 124         .short  0                                       // MajorVersion
 125         .short  0                                       // MinorVersion
 126         .long   IMAGE_DEBUG_TYPE_CODEVIEW               // Type
 127         .long   efi_debug_entry_size                    // SizeOfData
 128         .long   0                                       // RVA
 129         .long   efi_debug_entry - _head                 // FileOffset
 130
 131         .set    efi_debug_table_size, . - efi_debug_table
 132         .previous
 133
 134 efi_debug_entry:
 135         // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY
 136         .ascii  "NB10"                                  // Signature
 137         .long   0                                       // Unknown
 138         .long   0                                       // Unknown2
 139         .long   0                                       // Unknown3
 140
 141         .asciz  VMLINUX_PATH
 142
 143         .set    efi_debug_entry_size, . - efi_debug_entry
 144 #endif
 145
 146         /*
 147          * EFI will load .text onwards at the 4k section alignment
 148          * described in the PE/COFF header. To ensure that instruction
 149          * sequences using an adrp and a :lo12: immediate will function
 150          * correctly at this alignment, we must ensure that .text is
 151          * placed at a 4k boundary in the Image to begin with.
 152          */
 153         .align 12
 154 efi_header_end:
 155         .endm