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      1  1.1  jmcneill /*	$NetBSD: crt0-efi-riscv64.S,v 1.1.1.1 2021/09/30 18:50:09 jmcneill Exp $	*/
      2  1.1  jmcneill 
      3  1.1  jmcneill /* SPDX-License-Identifier: GPL-2.0+ */
      4  1.1  jmcneill /*
      5  1.1  jmcneill  * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel (at) linaro.org>
      6  1.1  jmcneill  * Copright (C) 2018 Alexander Graf <agraf (at) suse.de>
      7  1.1  jmcneill  *
      8  1.1  jmcneill  * Redistribution and use in source and binary forms, with or without
      9  1.1  jmcneill  * modification, are permitted provided that the following conditions
     10  1.1  jmcneill  * are met:
     11  1.1  jmcneill  * 1. Redistributions of source code must retain the above copyright
     12  1.1  jmcneill  *    notice and this list of conditions, without modification.
     13  1.1  jmcneill  * 2. The name of the author may not be used to endorse or promote products
     14  1.1  jmcneill  *    derived from this software without specific prior written permission.
     15  1.1  jmcneill  *
     16  1.1  jmcneill  * Alternatively, this software may be distributed under the terms of the
     17  1.1  jmcneill  * GNU General Public License as published by the Free Software Foundation;
     18  1.1  jmcneill  * either version 2 of the License, or (at your option) any later version.
     19  1.1  jmcneill  */
     20  1.1  jmcneill 
     21  1.1  jmcneill #ifndef EFI_SUBSYSTEM
     22  1.1  jmcneill #define EFI_SUBSYSTEM 10
     23  1.1  jmcneill #endif
     24  1.1  jmcneill 
     25  1.1  jmcneill 	.section	.text.head
     26  1.1  jmcneill 
     27  1.1  jmcneill 	/*
     28  1.1  jmcneill 	 * Magic "MZ" signature for PE/COFF
     29  1.1  jmcneill 	 */
     30  1.1  jmcneill 	.globl	ImageBase
     31  1.1  jmcneill ImageBase:
     32  1.1  jmcneill 	.ascii	"MZ"
     33  1.1  jmcneill 	.skip	58				// 'MZ' + pad + offset == 64
     34  1.1  jmcneill 	.long	pe_header - ImageBase		// Offset to the PE header.
     35  1.1  jmcneill pe_header:
     36  1.1  jmcneill 	.ascii	"PE"
     37  1.1  jmcneill 	.short 	0
     38  1.1  jmcneill coff_header:
     39  1.1  jmcneill 	.short	0x5064				// riscv64
     40  1.1  jmcneill 	.short	2				// nr_sections
     41  1.1  jmcneill 	.long	0 				// TimeDateStamp
     42  1.1  jmcneill 	.long	0				// PointerToSymbolTable
     43  1.1  jmcneill 	.long	0				// NumberOfSymbols
     44  1.1  jmcneill 	.short	section_table - optional_header	// SizeOfOptionalHeader
     45  1.1  jmcneill 	.short	0x206				// Characteristics.
     46  1.1  jmcneill 						// IMAGE_FILE_DEBUG_STRIPPED |
     47  1.1  jmcneill 						// IMAGE_FILE_EXECUTABLE_IMAGE |
     48  1.1  jmcneill 						// IMAGE_FILE_LINE_NUMS_STRIPPED
     49  1.1  jmcneill optional_header:
     50  1.1  jmcneill 	.short	0x20b				// PE32+ format
     51  1.1  jmcneill 	.byte	0x02				// MajorLinkerVersion
     52  1.1  jmcneill 	.byte	0x14				// MinorLinkerVersion
     53  1.1  jmcneill 	.long	_data - _start			// SizeOfCode
     54  1.1  jmcneill 	.long	_data_size			// SizeOfInitializedData
     55  1.1  jmcneill 	.long	0				// SizeOfUninitializedData
     56  1.1  jmcneill 	.long	_start - ImageBase		// AddressOfEntryPoint
     57  1.1  jmcneill 	.long	_start - ImageBase		// BaseOfCode
     58  1.1  jmcneill 
     59  1.1  jmcneill extra_header_fields:
     60  1.1  jmcneill 	.quad	0				// ImageBase
     61  1.1  jmcneill 	.long	0x1000				// SectionAlignment
     62  1.1  jmcneill 	.long	0x200				// FileAlignment
     63  1.1  jmcneill 	.short	0				// MajorOperatingSystemVersion
     64  1.1  jmcneill 	.short	0				// MinorOperatingSystemVersion
     65  1.1  jmcneill 	.short	0				// MajorImageVersion
     66  1.1  jmcneill 	.short	0				// MinorImageVersion
     67  1.1  jmcneill 	.short	0				// MajorSubsystemVersion
     68  1.1  jmcneill 	.short	0				// MinorSubsystemVersion
     69  1.1  jmcneill 	.long	0				// Win32VersionValue
     70  1.1  jmcneill 
     71  1.1  jmcneill 	.long	_edata - ImageBase		// SizeOfImage
     72  1.1  jmcneill 
     73  1.1  jmcneill 	// Everything before the kernel image is considered part of the header
     74  1.1  jmcneill 	.long	_start - ImageBase		// SizeOfHeaders
     75  1.1  jmcneill 	.long	0				// CheckSum
     76  1.1  jmcneill 	.short	EFI_SUBSYSTEM			// Subsystem
     77  1.1  jmcneill 	.short	0				// DllCharacteristics
     78  1.1  jmcneill 	.quad	0				// SizeOfStackReserve
     79  1.1  jmcneill 	.quad	0				// SizeOfStackCommit
     80  1.1  jmcneill 	.quad	0				// SizeOfHeapReserve
     81  1.1  jmcneill 	.quad	0				// SizeOfHeapCommit
     82  1.1  jmcneill 	.long	0				// LoaderFlags
     83  1.1  jmcneill 	.long	0x6				// NumberOfRvaAndSizes
     84  1.1  jmcneill 
     85  1.1  jmcneill 	.quad	0				// ExportTable
     86  1.1  jmcneill 	.quad	0				// ImportTable
     87  1.1  jmcneill 	.quad	0				// ResourceTable
     88  1.1  jmcneill 	.quad	0				// ExceptionTable
     89  1.1  jmcneill 	.quad	0				// CertificationTable
     90  1.1  jmcneill 	.quad	0				// BaseRelocationTable
     91  1.1  jmcneill 
     92  1.1  jmcneill 	// Section table
     93  1.1  jmcneill section_table:
     94  1.1  jmcneill 	/*
     95  1.1  jmcneill 	 * The EFI application loader requires a relocation section
     96  1.1  jmcneill 	 * because EFI applications must be relocatable.  This is a
     97  1.1  jmcneill 	 * dummy section as far as we are concerned.
     98  1.1  jmcneill 	 */
     99  1.1  jmcneill 	.ascii	".reloc\0\0"
    100  1.1  jmcneill 	.long	0
    101  1.1  jmcneill 	.long	0
    102  1.1  jmcneill 	.long	0				// SizeOfRawData
    103  1.1  jmcneill 	.long	0				// PointerToRawData
    104  1.1  jmcneill 	.long	0				// PointerToRelocations
    105  1.1  jmcneill 	.long	0				// PointerToLineNumbers
    106  1.1  jmcneill 	.short	0				// NumberOfRelocations
    107  1.1  jmcneill 	.short	0				// NumberOfLineNumbers
    108  1.1  jmcneill 	.long	0x42100040			// Characteristics (section flags)
    109  1.1  jmcneill 
    110  1.1  jmcneill 	.ascii	".text\0\0\0"
    111  1.1  jmcneill 	.long	_edata - _start			// VirtualSize
    112  1.1  jmcneill 	.long	_start - ImageBase		// VirtualAddress
    113  1.1  jmcneill 	.long	_edata - _start			// SizeOfRawData
    114  1.1  jmcneill 	.long	_start - ImageBase		// PointerToRawData
    115  1.1  jmcneill 
    116  1.1  jmcneill 	.long	0				// PointerToRelocations (0 for executables)
    117  1.1  jmcneill 	.long	0				// PointerToLineNumbers (0 for executables)
    118  1.1  jmcneill 	.short	0				// NumberOfRelocations  (0 for executables)
    119  1.1  jmcneill 	.short	0				// NumberOfLineNumbers  (0 for executables)
    120  1.1  jmcneill 	.long	0xe0500020			// Characteristics (section flags)
    121  1.1  jmcneill 
    122  1.1  jmcneill 	.align	12
    123  1.1  jmcneill 	.globl _start
    124  1.1  jmcneill _start:
    125  1.1  jmcneill 	addi		sp, sp, -24
    126  1.1  jmcneill 	sd		a0, 0(sp)
    127  1.1  jmcneill 	sd		a1, 8(sp)
    128  1.1  jmcneill 	sd		ra, 16(sp)
    129  1.1  jmcneill 	lla		a0, ImageBase
    130  1.1  jmcneill 	lla		a1, _DYNAMIC
    131  1.1  jmcneill 	call		_relocate
    132  1.1  jmcneill 	bne		a0, zero, 0f
    133  1.1  jmcneill 	ld		a1, 8(sp)
    134  1.1  jmcneill 	ld		a0, 0(sp)
    135  1.1  jmcneill 	call		efi_main
    136  1.1  jmcneill 	ld		ra, 16(sp)
    137  1.1  jmcneill 0:	addi		sp, sp, 24
    138  1.1  jmcneill 	ret
    139