Sync/gnu-efi/gnuefi/crt0-efi-mips64el.S
Curle d588e232c4 Major overhaul of this branch.
This branch has been dedicated to purely the UEFI bootloader.
As such, all other code has been removed.

This code can be compiled with Visual Studio, gcc or llvm.
2019-07-17 21:10:29 +01:00

189 lines
4.7 KiB
ArmAsm

/*
* crt0-efi-mips64el.S - PE/COFF header for MIPS64 EFI applications
*
* Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
* Copright (C) 2017 Heiher <r@hev.cc>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice and this list of conditions, without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License as published by the Free Software Foundation;
* either version 2 of the License, or (at your option) any later version.
*/
.section .text.head
/*
* Magic "MZ" signature for PE/COFF
*/
.globl ImageBase
ImageBase:
.ascii "MZ"
.skip 58 // 'MZ' + pad + offset == 64
.long pe_header - ImageBase // Offset to the PE header.
pe_header:
.ascii "PE"
.short 0
coff_header:
.short 0x166 // MIPS little endian
.short 2 // nr_sections
.long 0 // TimeDateStamp
.long 0 // PointerToSymbolTable
.long 1 // NumberOfSymbols
.short section_table - optional_header // SizeOfOptionalHeader
.short 0x206 // Characteristics.
// IMAGE_FILE_DEBUG_STRIPPED |
// IMAGE_FILE_EXECUTABLE_IMAGE |
// IMAGE_FILE_LINE_NUMS_STRIPPED
optional_header:
.short 0x20b // PE32+ format
.byte 0x02 // MajorLinkerVersion
.byte 0x14 // MinorLinkerVersion
.long _edata - _start // SizeOfCode
.long 0 // SizeOfInitializedData
.long 0 // SizeOfUninitializedData
.long _start - ImageBase // AddressOfEntryPoint
.long _start - ImageBase // BaseOfCode
extra_header_fields:
.quad 0 // ImageBase
.long 0x20 // SectionAlignment
.long 0x8 // FileAlignment
.short 0 // MajorOperatingSystemVersion
.short 0 // MinorOperatingSystemVersion
.short 0 // MajorImageVersion
.short 0 // MinorImageVersion
.short 0 // MajorSubsystemVersion
.short 0 // MinorSubsystemVersion
.long 0 // Win32VersionValue
.long _edata - ImageBase // SizeOfImage
// Everything before the kernel image is considered part of the header
.long _start - ImageBase // SizeOfHeaders
.long 0 // CheckSum
.short EFI_SUBSYSTEM // Subsystem
.short 0 // DllCharacteristics
.quad 0 // SizeOfStackReserve
.quad 0 // SizeOfStackCommit
.quad 0 // SizeOfHeapReserve
.quad 0 // SizeOfHeapCommit
.long 0 // LoaderFlags
.long 0x6 // NumberOfRvaAndSizes
.quad 0 // ExportTable
.quad 0 // ImportTable
.quad 0 // ResourceTable
.quad 0 // ExceptionTable
.quad 0 // CertificationTable
.quad 0 // BaseRelocationTable
// Section table
section_table:
/*
* The EFI application loader requires a relocation section
* because EFI applications must be relocatable. This is a
* dummy section as far as we are concerned.
*/
.ascii ".reloc"
.byte 0
.byte 0 // end of 0 padding of section name
.long 0
.long 0
.long 0 // SizeOfRawData
.long 0 // PointerToRawData
.long 0 // PointerToRelocations
.long 0 // PointerToLineNumbers
.short 0 // NumberOfRelocations
.short 0 // NumberOfLineNumbers
.long 0x42100040 // Characteristics (section flags)
.ascii ".text"
.byte 0
.byte 0
.byte 0 // end of 0 padding of section name
.long _edata - _start // VirtualSize
.long _start - ImageBase // VirtualAddress
.long _edata - _start // SizeOfRawData
.long _start - ImageBase // PointerToRawData
.long 0 // PointerToRelocations (0 for executables)
.long 0 // PointerToLineNumbers (0 for executables)
.short 0 // NumberOfRelocations (0 for executables)
.short 0 // NumberOfLineNumbers (0 for executables)
.long 0xe0500020 // Characteristics (section flags)
.set push
.set noreorder
.align 4
.globl _start
.ent _start
.type _start, @function
_start:
daddiu $sp, -32
sd $ra, ($sp)
// Get pc & gp
.align 3
bal 1f
sd $gp, 8($sp)
_pc:
.dword _gp
.dword _DYNAMIC
.dword _relocate
1:
// pc in ra
ld $gp, ($ra)
dli $t0, _pc
dsubu $gp, $t0
daddu $gp, $ra
sd $a0, 16($sp)
sd $a1, 24($sp)
// a2: ImageHandle
move $a2, $a0
// a3: SystemTable
move $a3, $a1
// a0: ImageBase
dli $t1, ImageBase - _pc
daddu $a0, $ra, $t1
// a1: DynamicSection
ld $t1, 8($ra)
dsubu $t1, $t0
daddu $a1, $ra, $t1
// call _relocate
ld $t1, 16($ra)
dsubu $t1, $t0
daddu $t9, $ra, $t1
jalr $t9
nop
bnez $v0, 1b
nop
// a0: ImageHandle
ld $a0, 16($sp)
// call efi_main
dla $t9, efi_main
jalr $t9
// a1: SystemTable
ld $a1, 24($sp)
1:
ld $gp, 8($sp)
ld $ra, ($sp)
jr $ra
daddiu $sp, 32
.end _start
.set pop