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crt0-efi-riscv64.S revision 1.1 
      1 /*	$NetBSD: crt0-efi-riscv64.S,v 1.1 2021/09/30 18:50:09 jmcneill Exp $	*/
      2 
      3 /* SPDX-License-Identifier: GPL-2.0+ */
      4 /*
      5  * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel (at) linaro.org>
      6  * Copright (C) 2018 Alexander Graf <agraf (at) suse.de>
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice and this list of conditions, without modification.
     13  * 2. The name of the author may not be used to endorse or promote products
     14  *    derived from this software without specific prior written permission.
     15  *
     16  * Alternatively, this software may be distributed under the terms of the
     17  * GNU General Public License as published by the Free Software Foundation;
     18  * either version 2 of the License, or (at your option) any later version.
     19  */
     20 
     21 #ifndef EFI_SUBSYSTEM
     22 #define EFI_SUBSYSTEM 10
     23 #endif
     24 
     25 	.section	.text.head
     26 
     27 	/*
     28 	 * Magic "MZ" signature for PE/COFF
     29 	 */
     30 	.globl	ImageBase
     31 ImageBase:
     32 	.ascii	"MZ"
     33 	.skip	58				// 'MZ' + pad + offset == 64
     34 	.long	pe_header - ImageBase		// Offset to the PE header.
     35 pe_header:
     36 	.ascii	"PE"
     37 	.short 	0
     38 coff_header:
     39 	.short	0x5064				// riscv64
     40 	.short	2				// nr_sections
     41 	.long	0 				// TimeDateStamp
     42 	.long	0				// PointerToSymbolTable
     43 	.long	0				// NumberOfSymbols
     44 	.short	section_table - optional_header	// SizeOfOptionalHeader
     45 	.short	0x206				// Characteristics.
     46 						// IMAGE_FILE_DEBUG_STRIPPED |
     47 						// IMAGE_FILE_EXECUTABLE_IMAGE |
     48 						// IMAGE_FILE_LINE_NUMS_STRIPPED
     49 optional_header:
     50 	.short	0x20b				// PE32+ format
     51 	.byte	0x02				// MajorLinkerVersion
     52 	.byte	0x14				// MinorLinkerVersion
     53 	.long	_data - _start			// SizeOfCode
     54 	.long	_data_size			// SizeOfInitializedData
     55 	.long	0				// SizeOfUninitializedData
     56 	.long	_start - ImageBase		// AddressOfEntryPoint
     57 	.long	_start - ImageBase		// BaseOfCode
     58 
     59 extra_header_fields:
     60 	.quad	0				// ImageBase
     61 	.long	0x1000				// SectionAlignment
     62 	.long	0x200				// FileAlignment
     63 	.short	0				// MajorOperatingSystemVersion
     64 	.short	0				// MinorOperatingSystemVersion
     65 	.short	0				// MajorImageVersion
     66 	.short	0				// MinorImageVersion
     67 	.short	0				// MajorSubsystemVersion
     68 	.short	0				// MinorSubsystemVersion
     69 	.long	0				// Win32VersionValue
     70 
     71 	.long	_edata - ImageBase		// SizeOfImage
     72 
     73 	// Everything before the kernel image is considered part of the header
     74 	.long	_start - ImageBase		// SizeOfHeaders
     75 	.long	0				// CheckSum
     76 	.short	EFI_SUBSYSTEM			// Subsystem
     77 	.short	0				// DllCharacteristics
     78 	.quad	0				// SizeOfStackReserve
     79 	.quad	0				// SizeOfStackCommit
     80 	.quad	0				// SizeOfHeapReserve
     81 	.quad	0				// SizeOfHeapCommit
     82 	.long	0				// LoaderFlags
     83 	.long	0x6				// NumberOfRvaAndSizes
     84 
     85 	.quad	0				// ExportTable
     86 	.quad	0				// ImportTable
     87 	.quad	0				// ResourceTable
     88 	.quad	0				// ExceptionTable
     89 	.quad	0				// CertificationTable
     90 	.quad	0				// BaseRelocationTable
     91 
     92 	// Section table
     93 section_table:
     94 	/*
     95 	 * The EFI application loader requires a relocation section
     96 	 * because EFI applications must be relocatable.  This is a
     97 	 * dummy section as far as we are concerned.
     98 	 */
     99 	.ascii	".reloc\0\0"
    100 	.long	0
    101 	.long	0
    102 	.long	0				// SizeOfRawData
    103 	.long	0				// PointerToRawData
    104 	.long	0				// PointerToRelocations
    105 	.long	0				// PointerToLineNumbers
    106 	.short	0				// NumberOfRelocations
    107 	.short	0				// NumberOfLineNumbers
    108 	.long	0x42100040			// Characteristics (section flags)
    109 
    110 	.ascii	".text\0\0\0"
    111 	.long	_edata - _start			// VirtualSize
    112 	.long	_start - ImageBase		// VirtualAddress
    113 	.long	_edata - _start			// SizeOfRawData
    114 	.long	_start - ImageBase		// PointerToRawData
    115 
    116 	.long	0				// PointerToRelocations (0 for executables)
    117 	.long	0				// PointerToLineNumbers (0 for executables)
    118 	.short	0				// NumberOfRelocations  (0 for executables)
    119 	.short	0				// NumberOfLineNumbers  (0 for executables)
    120 	.long	0xe0500020			// Characteristics (section flags)
    121 
    122 	.align	12
    123 	.globl _start
    124 _start:
    125 	addi		sp, sp, -24
    126 	sd		a0, 0(sp)
    127 	sd		a1, 8(sp)
    128 	sd		ra, 16(sp)
    129 	lla		a0, ImageBase
    130 	lla		a1, _DYNAMIC
    131 	call		_relocate
    132 	bne		a0, zero, 0f
    133 	ld		a1, 8(sp)
    134 	ld		a0, 0(sp)
    135 	call		efi_main
    136 	ld		ra, 16(sp)
    137 0:	addi		sp, sp, 24
    138 	ret
    139