/* $NetBSD: crt0-efi-mips64el.S,v 1.1.1.2 2021/09/30 18:50:09 jmcneill Exp $ */ /* * crt0-efi-mips64el.S - PE/COFF header for MIPS64 EFI applications * * Copright (C) 2014 Linaro Ltd. * Copright (C) 2017 Heiher * * 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 0 // 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