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_signature_nop
  11 #ifdef CONFIG_EFI
  12 .L_head:
  13         /*
  14          * This ccmp instruction has no meaningful effect except that
  15          * its opcode forms the magic "MZ" signature required by UEFI.
  16          */
  17         ccmp    x18, #0, #0xd, pl
  18 #else
  19         /*
  20          * Bootloaders may inspect the opcode at the start of the kernel
  21          * image to decide if the kernel is capable of booting via UEFI.
  22          * So put an ordinary NOP here, not the "MZ.." pseudo-nop above.
  23          */
  24         nop
  25 #endif
  26         .endm
  27
  28         .macro  __EFI_PE_HEADER
  29 #ifdef CONFIG_EFI
  30         .set    .Lpe_header_offset, . - .L_head
  31         .long   PE_MAGIC
  32         .short  IMAGE_FILE_MACHINE_ARM64                // Machine
  33         .short  .Lsection_count                         // NumberOfSections
  34         .long   0                                       // TimeDateStamp
  35         .long   0                                       // PointerToSymbolTable
  36         .long   0                                       // NumberOfSymbols
  37         .short  .Lsection_table - .Loptional_header     // SizeOfOptionalHeader
  38         .short  IMAGE_FILE_DEBUG_STRIPPED | \
  39                 IMAGE_FILE_EXECUTABLE_IMAGE | \
  40                 IMAGE_FILE_LINE_NUMS_STRIPPED           // Characteristics
  41
  42 .Loptional_header:
  43         .short  PE_OPT_MAGIC_PE32PLUS                   // PE32+ format
  44         .byte   0x02                                    // MajorLinkerVersion
  45         .byte   0x14                                    // MinorLinkerVersion
  46         .long   __initdata_begin - .Lefi_header_end     // SizeOfCode
  47         .long   __pecoff_data_size                      // SizeOfInitializedData
  48         .long   0                                       // SizeOfUninitializedData
  49         .long   __efistub_efi_pe_entry - .L_head        // AddressOfEntryPoint
  50         .long   .Lefi_header_end - .L_head              // BaseOfCode
  51
  52         .quad   0                                       // ImageBase
  53         .long   SEGMENT_ALIGN                           // SectionAlignment
  54         .long   PECOFF_FILE_ALIGNMENT                   // FileAlignment
  55         .short  0                                       // MajorOperatingSystemVersion
  56         .short  0                                       // MinorOperatingSystemVersion
  57         .short  LINUX_EFISTUB_MAJOR_VERSION             // MajorImageVersion
  58         .short  LINUX_EFISTUB_MINOR_VERSION             // MinorImageVersion
  59         .short  0                                       // MajorSubsystemVersion
  60         .short  0                                       // MinorSubsystemVersion
  61         .long   0                                       // Win32VersionValue
  62
  63         .long   _end - .L_head                          // SizeOfImage
  64
  65         // Everything before the kernel image is considered part of the header
  66         .long   .Lefi_header_end - .L_head              // SizeOfHeaders
  67         .long   0                                       // CheckSum
  68         .short  IMAGE_SUBSYSTEM_EFI_APPLICATION         // Subsystem
  69         .short  IMAGE_DLL_CHARACTERISTICS_NX_COMPAT     // DllCharacteristics
  70         .quad   0                                       // SizeOfStackReserve
  71         .quad   0                                       // SizeOfStackCommit
  72         .quad   0                                       // SizeOfHeapReserve
  73         .quad   0                                       // SizeOfHeapCommit
  74         .long   0                                       // LoaderFlags
  75         .long   (.Lsection_table - .) / 8               // NumberOfRvaAndSizes
  76
  77         .quad   0                                       // ExportTable
  78         .quad   0                                       // ImportTable
  79         .quad   0                                       // ResourceTable
  80         .quad   0                                       // ExceptionTable
  81         .quad   0                                       // CertificationTable
  82         .quad   0                                       // BaseRelocationTable
  83
  84 #if defined(CONFIG_DEBUG_EFI) || defined(CONFIG_ARM64_BTI_KERNEL)
  85         .long   .Lefi_debug_table - .L_head             // DebugTable
  86         .long   .Lefi_debug_table_size
  87
  88         /*
  89          * The debug table is referenced via its Relative Virtual Address (RVA),
  90          * which is only defined for those parts of the image that are covered
  91          * by a section declaration. Since this header is not covered by any
  92          * section, the debug table must be emitted elsewhere. So stick it in
  93          * the .init.rodata section instead.
  94          *
  95          * Note that the payloads themselves are permitted to have zero RVAs,
  96          * which means we can simply put those right after the section headers.
  97          */
  98         __INITRODATA
  99
 100         .align  2
 101 .Lefi_debug_table:
 102 #ifdef CONFIG_DEBUG_EFI
 103         // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY
 104         .long   0                                       // Characteristics
 105         .long   0                                       // TimeDateStamp
 106         .short  0                                       // MajorVersion
 107         .short  0                                       // MinorVersion
 108         .long   IMAGE_DEBUG_TYPE_CODEVIEW               // Type
 109         .long   .Lefi_debug_entry_size                  // SizeOfData
 110         .long   0                                       // RVA
 111         .long   .Lefi_debug_entry - .L_head             // FileOffset
 112 #endif
 113 #ifdef CONFIG_ARM64_BTI_KERNEL
 114         .long   0                                       // Characteristics
 115         .long   0                                       // TimeDateStamp
 116         .short  0                                       // MajorVersion
 117         .short  0                                       // MinorVersion
 118         .long   IMAGE_DEBUG_TYPE_EX_DLLCHARACTERISTICS  // Type
 119         .long   4                                       // SizeOfData
 120         .long   0                                       // RVA
 121         .long   .Lefi_dll_characteristics_ex - .L_head  // FileOffset
 122 #endif
 123         .set    .Lefi_debug_table_size, . - .Lefi_debug_table
 124         .previous
 125 #endif
 126
 127         // Section table
 128 .Lsection_table:
 129         .ascii  ".text\0\0\0"
 130         .long   __initdata_begin - .Lefi_header_end     // VirtualSize
 131         .long   .Lefi_header_end - .L_head              // VirtualAddress
 132         .long   __initdata_begin - .Lefi_header_end     // SizeOfRawData
 133         .long   .Lefi_header_end - .L_head              // PointerToRawData
 134
 135         .long   0                                       // PointerToRelocations
 136         .long   0                                       // PointerToLineNumbers
 137         .short  0                                       // NumberOfRelocations
 138         .short  0                                       // NumberOfLineNumbers
 139         .long   IMAGE_SCN_CNT_CODE | \
 140                 IMAGE_SCN_MEM_READ | \
 141                 IMAGE_SCN_MEM_EXECUTE                   // Characteristics
 142
 143         .ascii  ".data\0\0\0"
 144         .long   __pecoff_data_size                      // VirtualSize
 145         .long   __initdata_begin - .L_head              // VirtualAddress
 146         .long   __pecoff_data_rawsize                   // SizeOfRawData
 147         .long   __initdata_begin - .L_head              // PointerToRawData
 148
 149         .long   0                                       // PointerToRelocations
 150         .long   0                                       // PointerToLineNumbers
 151         .short  0                                       // NumberOfRelocations
 152         .short  0                                       // NumberOfLineNumbers
 153         .long   IMAGE_SCN_CNT_INITIALIZED_DATA | \
 154                 IMAGE_SCN_MEM_READ | \
 155                 IMAGE_SCN_MEM_WRITE                     // Characteristics
 156
 157         .set    .Lsection_count, (. - .Lsection_table) / 40
 158
 159 #ifdef CONFIG_DEBUG_EFI
 160 .Lefi_debug_entry:
 161         // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY
 162         .ascii  "NB10"                                  // Signature
 163         .long   0                                       // Unknown
 164         .long   0                                       // Unknown2
 165         .long   0                                       // Unknown3
 166
 167         .asciz  VMLINUX_PATH
 168
 169         .set    .Lefi_debug_entry_size, . - .Lefi_debug_entry
 170 #endif
 171 #ifdef CONFIG_ARM64_BTI_KERNEL
 172 .Lefi_dll_characteristics_ex:
 173         .long   IMAGE_DLLCHARACTERISTICS_EX_FORWARD_CFI_COMPAT
 174 #endif
 175
 176         .balign SEGMENT_ALIGN
 177 .Lefi_header_end:
 178 #else
 179         .set    .Lpe_header_offset, 0x0
 180 #endif
 181         .endm