arch/arm/lib/crt0_aarch64_efi.S

   1 /* SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause */
   2 /*
   3  * crt0-efi-aarch64.S - PE/COFF header for aarch64 EFI applications
   4  *
   5  * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
   6  *
   7  *
   8  * This file is taken and modified from the gnu-efi project.
   9  */
  10
  11 #include <asm-generic/pe.h>
  12
  13         .section        .text.head
  14
  15         /*
  16          * Magic "MZ" signature for PE/COFF
  17          */
  18         .globl  ImageBase
  19 ImageBase:
  20         .short  IMAGE_DOS_SIGNATURE             /* 'MZ' */
  21         .skip   58                              /* 'MZ' + pad + offset == 64 */
  22         .long   pe_header - ImageBase           /* Offset to the PE header */
  23 pe_header:
  24         .long   IMAGE_NT_SIGNATURE              /* 'PE' */
  25 coff_header:
  26         .short  IMAGE_FILE_MACHINE_ARM64        /* AArch64 */
  27         .short  2                               /* nr_sections */
  28         .long   0                               /* TimeDateStamp */
  29         .long   0                               /* PointerToSymbolTable */
  30         .long   0                               /* NumberOfSymbols */
  31         .short  section_table - optional_header /* SizeOfOptionalHeader */
  32         /* Characteristics */
  33         .short  (IMAGE_FILE_EXECUTABLE_IMAGE | \
  34                  IMAGE_FILE_LINE_NUMS_STRIPPED | \
  35                  IMAGE_FILE_LOCAL_SYMS_STRIPPED | \
  36                  IMAGE_FILE_DEBUG_STRIPPED)
  37 optional_header:
  38         .short  IMAGE_NT_OPTIONAL_HDR64_MAGIC   /* PE32+ format */
  39         .byte   0x02                            /* MajorLinkerVersion */
  40         .byte   0x14                            /* MinorLinkerVersion */
  41         .long   _edata - _start                 /* SizeOfCode */
  42         .long   0                               /* SizeOfInitializedData */
  43         .long   0                               /* SizeOfUninitializedData */
  44         .long   _start - ImageBase              /* AddressOfEntryPoint */
  45         .long   _start - ImageBase              /* BaseOfCode */
  46
  47 extra_header_fields:
  48         .quad   0                               /* ImageBase */
  49         .long   0x20                            /* SectionAlignment */
  50         .long   0x8                             /* FileAlignment */
  51         .short  0                               /* MajorOperatingSystemVersion */
  52         .short  0                               /* MinorOperatingSystemVersion */
  53         .short  0                               /* MajorImageVersion */
  54         .short  0                               /* MinorImageVersion */
  55         .short  0                               /* MajorSubsystemVersion */
  56         .short  0                               /* MinorSubsystemVersion */
  57         .long   0                               /* Win32VersionValue */
  58
  59         .long   _edata - ImageBase              /* SizeOfImage */
  60
  61         /*
  62          * Everything before the kernel image is considered part of the header
  63          */
  64         .long   _start - ImageBase              /* SizeOfHeaders */
  65         .long   0                               /* CheckSum */
  66         .short  IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
  67         .short  0                               /* DllCharacteristics */
  68         .quad   0                               /* SizeOfStackReserve */
  69         .quad   0                               /* SizeOfStackCommit */
  70         .quad   0                               /* SizeOfHeapReserve */
  71         .quad   0                               /* SizeOfHeapCommit */
  72         .long   0                               /* LoaderFlags */
  73         .long   0x6                             /* NumberOfRvaAndSizes */
  74
  75         .quad   0                               /* ExportTable */
  76         .quad   0                               /* ImportTable */
  77         .quad   0                               /* ResourceTable */
  78         .quad   0                               /* ExceptionTable */
  79         .quad   0                               /* CertificationTable */
  80         .quad   0                               /* BaseRelocationTable */
  81
  82         /* Section table */
  83 section_table:
  84
  85         /*
  86          * The EFI application loader requires a relocation section
  87          * because EFI applications must be relocatable.  This is a
  88          * dummy section as far as we are concerned.
  89          */
  90         .ascii  ".reloc"
  91         .byte   0
  92         .byte   0                       /* end of 0 padding of section name */
  93         .long   0
  94         .long   0
  95         .long   0                       /* SizeOfRawData */
  96         .long   0                       /* PointerToRawData */
  97         .long   0                       /* PointerToRelocations */
  98         .long   0                       /* PointerToLineNumbers */
  99         .short  0                       /* NumberOfRelocations */
 100         .short  0                       /* NumberOfLineNumbers */
 101         .long   0x42100040              /* Characteristics (section flags) */
 102
 103
 104         .ascii  ".text"
 105         .byte   0
 106         .byte   0
 107         .byte   0                       /* end of 0 padding of section name */
 108         .long   _edata - _start         /* VirtualSize */
 109         .long   _start - ImageBase      /* VirtualAddress */
 110         .long   _edata - _start         /* SizeOfRawData */
 111         .long   _start - ImageBase      /* PointerToRawData */
 112
 113         .long   0               /* PointerToRelocations (0 for executables) */
 114         .long   0               /* PointerToLineNumbers (0 for executables) */
 115         .short  0               /* NumberOfRelocations  (0 for executables) */
 116         .short  0               /* NumberOfLineNumbers  (0 for executables) */
 117         .long   0xe0500020      /* Characteristics (section flags) */
 118
 119 _start:
 120         stp             x29, x30, [sp, #-32]!
 121         mov             x29, sp
 122
 123         stp             x0, x1, [sp, #16]
 124         adr             x0, ImageBase
 125         adrp            x1, _DYNAMIC
 126         add             x1, x1, #:lo12:_DYNAMIC
 127         bl              _relocate
 128         cbnz            x0, 0f
 129
 130         ldp             x0, x1, [sp, #16]
 131         bl              efi_main
 132
 133 0:      ldp             x29, x30, [sp], #32
 134         ret