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Diffstat (limited to 'crt0-efi-x86_64.S')
| -rw-r--r-- | crt0-efi-x86_64.S | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/crt0-efi-x86_64.S b/crt0-efi-x86_64.S new file mode 100644 index 00000000..f334a633 --- /dev/null +++ b/crt0-efi-x86_64.S @@ -0,0 +1,177 @@ +/* crt0-efi-x86_64.S - x86_64 EFI startup code. + * + * Copyright 2014 Red Hat, Inc. <pjones@redhat.com> + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + .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. + .long 0x0eba1f0e /* terrifying code */ + .long 0xcd09b400 /* terrifying code */ + .long 0x4c01b821 /* terrifying code */ + .short 0x21cd /* terrfiying code */ + .ascii "The only winning move is not to play.\r\r\n$" /* DOS text */ + .skip 9 +pe_header: + .ascii "PE" + .short 0 +coff_header: + .short 0x8664 // x86_64 + .short 1 // 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 0x18 // 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 0x10 // NumberOfRvaAndSizes + + .quad 0 // ExportTable + .quad 0 // ImportTable + .quad 0 // ResourceTable + .quad 0 // ExceptionTable + .quad 0 // CertificationTable + .quad 0 // BaseRelocationTable + .quad 0 // DebugTable + .quad 0 // ArchTable + .quad 0 // GlobalPointerTable + .quad 0 // .tls + .quad 0 // LoadConfigTable + .quad 0 // BoundImportsTable + .quad 0 // ImportAddressTable + .quad 0 // DelayLoadImportTable + .quad 0 // ClrRuntimeHeader (.cor) + .quad 0 // Reserved + + // Section table +section_table: + .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 0x60500020 // Characteristics (section flags) + + /* + * 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 // VirtualSize + .long 0 // VirtualAddress + .long 0 // SizeOfRawData + .long 0 // PointerToRawData + .long 0 // PointerToRelocations + .long 0 // PointerToLineNumbers + .short 0 // NumberOfRelocations + .short 0 // NumberOfLineNumbers + .long 0x42100040 // Characteristics (section flags) + + /* x86-64 needs this padding here; without it, some machines simply + * refuse to admit this is an EFI binary. I'm not really sure why; + * reading the spec, it's unclear, but you'd expect it would need to + * be aligned to (1 << FileAlignment), which would mean not having + * the spacing. + */ + .quad 0 +_start: + subq $8, %rsp + pushq %rcx + pushq %rdx + +0: + lea ImageBase(%rip), %rdi + lea _DYNAMIC(%rip), %rsi + + popq %rcx + popq %rdx + pushq %rcx + pushq %rdx + call _relocate + + popq %rdi + popq %rsi + + call efi_main + addq $8, %rsp + +.exit: + ret |