arch/arm64/kernel/efi-header.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2013 - 2017 Linaro, Ltd.
   4  * Copyright (C) 2013, 2014 Red Hat, Inc.
   5  */
   6
   7 #include <linux/pe.h>
   8 #include <linux/sizes.h>
   9
  10         .macro  __EFI_PE_HEADER
  11         .long   PE_MAGIC
  12 coff_header:
  13         .short  IMAGE_FILE_MACHINE_ARM64                // Machine
  14         .short  section_count                           // NumberOfSections
  15         .long   0                                       // TimeDateStamp
  16         .long   0                                       // PointerToSymbolTable
  17         .long   0                                       // NumberOfSymbols
  18         .short  section_table - optional_header         // SizeOfOptionalHeader
  19         .short  IMAGE_FILE_DEBUG_STRIPPED | \
  20                 IMAGE_FILE_EXECUTABLE_IMAGE | \
  21                 IMAGE_FILE_LINE_NUMS_STRIPPED           // Characteristics
  22
  23 optional_header:
  24         .short  PE_OPT_MAGIC_PE32PLUS                   // PE32+ format
  25         .byte   0x02                                    // MajorLinkerVersion
  26         .byte   0x14                                    // MinorLinkerVersion
  27         .long   __initdata_begin - efi_header_end       // SizeOfCode
  28         .long   __pecoff_data_size                      // SizeOfInitializedData
  29         .long   0                                       // SizeOfUninitializedData
  30         .long   __efistub_efi_pe_entry - _head          // AddressOfEntryPoint
  31         .long   efi_header_end - _head                  // BaseOfCode
  32
  33 extra_header_fields:
  34         .quad   0                                       // ImageBase
  35         .long   SEGMENT_ALIGN                           // SectionAlignment
  36         .long   PECOFF_FILE_ALIGNMENT                   // FileAlignment
  37         .short  0                                       // MajorOperatingSystemVersion
  38         .short  0                                       // MinorOperatingSystemVersion
  39         .short  LINUX_EFISTUB_MAJOR_VERSION             // MajorImageVersion
  40         .short  LINUX_EFISTUB_MINOR_VERSION             // MinorImageVersion
  41         .short  0                                       // MajorSubsystemVersion
  42         .short  0                                       // MinorSubsystemVersion
  43         .long   0                                       // Win32VersionValue
  44
  45         .long   _end - _head                            // SizeOfImage
  46
  47         // Everything before the kernel image is considered part of the header
  48         .long   efi_header_end - _head                  // SizeOfHeaders
  49         .long   0                                       // CheckSum
  50         .short  IMAGE_SUBSYSTEM_EFI_APPLICATION         // Subsystem
  51         .short  0                                       // DllCharacteristics
  52         .quad   0                                       // SizeOfStackReserve
  53         .quad   0                                       // SizeOfStackCommit
  54         .quad   0                                       // SizeOfHeapReserve
  55         .quad   0                                       // SizeOfHeapCommit
  56         .long   0                                       // LoaderFlags
  57         .long   (section_table - .) / 8                 // NumberOfRvaAndSizes
  58
  59         .quad   0                                       // ExportTable
  60         .quad   0                                       // ImportTable
  61         .quad   0                                       // ResourceTable
  62         .quad   0                                       // ExceptionTable
  63         .quad   0                                       // CertificationTable
  64         .quad   0                                       // BaseRelocationTable
  65
  66 #ifdef CONFIG_DEBUG_EFI
  67         .long   efi_debug_table - _head                 // DebugTable
  68         .long   efi_debug_table_size
  69 #endif
  70
  71         // Section table
  72 section_table:
  73         .ascii  ".text\0\0\0"
  74         .long   __initdata_begin - efi_header_end       // VirtualSize
  75         .long   efi_header_end - _head                  // VirtualAddress
  76         .long   __initdata_begin - efi_header_end       // SizeOfRawData
  77         .long   efi_header_end - _head                  // PointerToRawData
  78
  79         .long   0                                       // PointerToRelocations
  80         .long   0                                       // PointerToLineNumbers
  81         .short  0                                       // NumberOfRelocations
  82         .short  0                                       // NumberOfLineNumbers
  83         .long   IMAGE_SCN_CNT_CODE | \
  84                 IMAGE_SCN_MEM_READ | \
  85                 IMAGE_SCN_MEM_EXECUTE                   // Characteristics
  86
  87         .ascii  ".data\0\0\0"
  88         .long   __pecoff_data_size                      // VirtualSize
  89         .long   __initdata_begin - _head                // VirtualAddress
  90         .long   __pecoff_data_rawsize                   // SizeOfRawData
  91         .long   __initdata_begin - _head                // PointerToRawData
  92
  93         .long   0                                       // PointerToRelocations
  94         .long   0                                       // PointerToLineNumbers
  95         .short  0                                       // NumberOfRelocations
  96         .short  0                                       // NumberOfLineNumbers
  97         .long   IMAGE_SCN_CNT_INITIALIZED_DATA | \
  98                 IMAGE_SCN_MEM_READ | \
  99                 IMAGE_SCN_MEM_WRITE                     // Characteristics
 100
 101         .set    section_count, (. - section_table) / 40
 102
 103 #ifdef CONFIG_DEBUG_EFI
 104         /*
 105          * The debug table is referenced via its Relative Virtual Address (RVA),
 106          * which is only defined for those parts of the image that are covered
 107          * by a section declaration. Since this header is not covered by any
 108          * section, the debug table must be emitted elsewhere. So stick it in
 109          * the .init.rodata section instead.
 110          *
 111          * Note that the EFI debug entry itself may legally have a zero RVA,
 112          * which means we can simply put it right after the section headers.
 113          */
 114         __INITRODATA
 115
 116         .align  2
 117 efi_debug_table:
 118         // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY
 119         .long   0                                       // Characteristics
 120         .long   0                                       // TimeDateStamp
 121         .short  0                                       // MajorVersion
 122         .short  0                                       // MinorVersion
 123         .long   IMAGE_DEBUG_TYPE_CODEVIEW               // Type
 124         .long   efi_debug_entry_size                    // SizeOfData
 125         .long   0                                       // RVA
 126         .long   efi_debug_entry - _head                 // FileOffset
 127
 128         .set    efi_debug_table_size, . - efi_debug_table
 129         .previous
 130
 131 efi_debug_entry:
 132         // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY
 133         .ascii  "NB10"                                  // Signature
 134         .long   0                                       // Unknown
 135         .long   0                                       // Unknown2
 136         .long   0                                       // Unknown3
 137
 138         .asciz  VMLINUX_PATH
 139
 140         .set    efi_debug_entry_size, . - efi_debug_entry
 141 #endif
 142
 143         /*
 144          * EFI will load .text onwards at the 4k section alignment
 145          * described in the PE/COFF header. To ensure that instruction
 146          * sequences using an adrp and a :lo12: immediate will function
 147          * correctly at this alignment, we must ensure that .text is
 148          * placed at a 4k boundary in the Image to begin with.
 149          */
 150         .balign SEGMENT_ALIGN
 151 efi_header_end:
 152         .endm