Add initial (non-working) versoin of hex0.hex0.
This commit is contained in:
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8e22fee483
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c1df626dc6
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@ -0,0 +1,415 @@
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# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
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# SPDX-FileCopyrightText: 2022 Jeremiah Orians <jeremiah@pdp10.guru>
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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# Usage: hex0 file.hex0 file
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# Does not validate the arguments or check for success
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# Calling convention:
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# First four arguments are passed via registers rcx, rdx, r8, r9 (if they fit in 64-bits)
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# but we need to leave stack space
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# rax, rcx, rdx, r8, r9, r10 and r11 are volatile and can be changed by called function
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# Registers:
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# r12 in/fin: input file name, later reused for handle
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# r13 out/fout: output file name, later reused for handle
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# r14 system->boot->open_protocol from UEFI, later reused for rootdir
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# r15 image_handle from UEFI
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# hex0 algorithm mostly follows stage0-posix version but uses rdi instead of rbp
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# DOS MZ header
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4D 5A # Signature
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78 00 # Number of bytes in the last page.
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01 00 # Number of whole/partial pages
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00 00 # Number of entries in the relocation table.
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04 00 # Header size
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00 00 # Minimum allocation
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00 00 # Maximum allocation
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00 00 # Relocatable segment address for SS
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00 00 # Initial value for SP
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00 00 # Checksum (I don't think is looked at)
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00 00 # Initial value for IP (Seems ignored)
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00 00 # Relocatable segment address for CS (Seems ignored)
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40 00 # The (absolute) offset to the relocation table.
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00 00 # Value used for overlay management. If zero, this is the main executable
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00 00 00 00 00 00 00 00 # Reserved in PE
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00 00 # OEM identifier
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00 00 # OEM info
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00 00 00 00 00 00 00 00 00 00 # The required reserved 20 bytes of NULLS
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00 00 00 00 00 00 00 00 00 00
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40 00 00 00 # Starting address of the PE header
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# [0x80]
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# PE header
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50 45 00 00 # Signature "PE"
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64 86 # Machine
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01 00 # number of sections
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00 00 00 00 # Timestamp supposedly
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00 00 00 00 # PointerToSymbolTable
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00 00 00 00 # number of symbols
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F0 00 # SizeOfOptionalHeader
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22 20 # 'Characteristics'
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# [0x98]
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# COFF header bits
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0B 02 # Magic PE32+ (64 bit)
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00 00 # Linker version
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A2 01 00 00 # size of code
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00 00 00 00 # sizeOfInitializedData
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00 00 00 00 # SizeOfUninitializedData
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00 10 00 00 # AddressOfEntryPoint
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00 10 00 00 # BaseOfCode
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00 00 00 80 01 00 00 00 # ImageBase
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01 00 00 00 # SectionAlignment
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01 00 00 00 # FileAlignment
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06 00 00 00 # OperatingSystemVersion
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00 00 00 00 # ImageVersion
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06 00 00 00 # SubsystemVersion
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00 00 00 00 # Win32VersionValue
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00 20 00 00 # SizeOfImage
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70 01 00 00 # SizeOfHeaders
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00 00 00 00 # CheckSum (isn't used at all)
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0A 00 # Subsystem
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60 01 # DllCharacteristics
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00 00 10 00 # SizeOfStackReserve
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00 00 00 00 # SizeOfStackCommit
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00 10 00 00 # SizeOfHeapReserve
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00 00 00 00 # SizeOfHeapCommit
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00 00 10 00 # LoaderFlags
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00 00 00 00 # NumberOfRvaAndSizes
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# [0xB8]
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# Data directories (has to be 16 entries always 16bytes per entry)
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00 00 00 00 # Export Table
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00 00 00 00 # Size of Export Table
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00 00 00 00 # Import Table
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10 00 00 00 # Size of Import Table
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00 00 00 00 # Resource Table
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00 00 00 00 # Size of Resource Table
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00 00 00 00 # Exception Table
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00 00 00 00 # Size of Exception Table
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00 00 00 00 # Certificate Table
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00 00 00 00 # Size of Certificate Table
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00 00 00 00 # Base Relocation Table
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00 00 00 00 # Size of Base Relocation Table
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00 00 00 00 # Debug Table
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00 00 00 00 # Size of Debug Table
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00 00 00 00 # Architecture Data Table
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00 00 00 00 # Size of Architecture Data Table
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00 00 00 00 # Global Pointer
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00 00 00 00 # NULL
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00 00 00 00 # TLS Table
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00 00 00 00 # Size of TLS Table
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00 00 00 00 # Load Config Table
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00 00 00 00 # Size of Load Config Table
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00 00 00 00 # Bound Import Table
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00 00 00 00 # Size of Bound Import Table
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00 00 00 00 # Import Address Table
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00 00 00 00 # Size of Import Address Table
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00 00 00 00 # Delay Import Descriptor Table
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00 00 00 00 # Size of Delay Import Descriptor Table
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00 00 00 00 # CLR Runtime header table
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00 00 00 00 # Size of CLR Runtime Header table
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00 00 00 00 00 00 00 00 # MUST BE NULL
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# no idea what it is yet
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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# [0x148]
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# Start of section headers
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2E 74 65 78 74 00 00 00 ; Name: ".text"
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A2 01 00 00 ; VirtualSize
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00 10 00 00 ; VirtualAddress
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A2 01 00 00 ; SizeOfRawData
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70 01 00 00 ; PointerToRawData
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00 00 00 00 ; PointerToRelocations
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00 00 00 00 ; PointerToLinenumbers
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00 00 ; NumberOfRelocations
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00 00 ; NumberOfLinenumbers
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20 00 00 60 ; 'Characteristics'
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# [0x170]
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# Our actual program
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# efi_main(void *image_handle, struct efi_system_table *system)
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# :_start
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4889E5 ; COPY_RSP_to_RBP # save stack pointer
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4889CF ; COPY_R15_to_RCX # save image_handle
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4C8B72 60 ; LOAD64_into_R14_from_Address_RDX_Immediate8 !96 # system->boot
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4D8BB6 18010000 ; LOAD64_into_R14_from_Address_R14_Immediate32 %280 # system->boot->open_protocol
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# Open Loaded Image protocol
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50 ; PUSH_RAX # allocate stack for image
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4989E0 ; COPY_R8_to_RSP # arg3 = &image
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488905 6E010000 ; LOADI64_rel_RDX !LOADED_IMAGE_PROTOCOL_8 # EFI_LOADED_IMAGE_PROTOCOL_GUID (last 64 bits)
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# [_start+0x1C]
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52 ; PUSH_RDX # push last 64 bits onto stack
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488905 5E010000 ; LOADI64_rel_RDX !LOADED_IMAGE_PROTOCOL # EFI_LOADED_IMAGE_PROTOCOL_GUID (first 64 bits)
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# [_start+0x24]
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52 ; PUSH_RDX # push first 64 bits onto stack
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4889E2 ; COPY_RDX_to_RSP # arg2 = &guid
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6A 01 ; PUSH !1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
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6A 00 ; PUSH !0 # arg5 = NULL
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4989E0 ; COPY_R8_to_RSP # arg4 = image_handle
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# arg1 = ImageHandle (already set)
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4883EC 20 ; SUBI8_RSP !32 # allocate shadow stack space for UEFI function
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41FFD6 ; CALL_R14 # system->boot->open_protocol(image_handle, &guid, &image, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL)
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488B4424 40 ; LOAD64_into_RAX_from_Address_RSP_Immediate8 !64 # get_image
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# Command line args
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4889C1 ; COPY_RCX_to_RAX # save image
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488B58 38 ; LOAD64_into_RBX_from_Address_RAX_Immediate8 !56 # options = image->load_options
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# :loop_options1 [_start+0x42] # Skip application name
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4883C3 02 ; ADDI8_RBX !2 # ++options
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8A03 ; LOAD8_AL_from_Address_RBX # *options
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3C 20 ; CMPI8_AL !0x20 # if *options != ' '
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75 F6 ; JNE8 !loop_options1 # then jump
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4883C3 02 ; ADDI8_RBX !2 # ++options
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4989DC ; COPY_RBX_to_R12 # save input file
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# :loop_options2 [_start+0x53] # Skip argv[1]
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4883C3 02 ; ADDI8_RBX !2 # ++options
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8A03 ; LOAD8_AL_from_Address_RBX # *options
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3C 20 ; CMPI8_AL !0x20 # if *options != ' '
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75 F6 ; JNE8 !loop_options2 # then jump
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CB03 ; STOREI8_into_Address_RBX # *options = 0;
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4883C3 02 ; ADDI8_RBX !2 # ++options
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4989DD ; COPY_RBX_to_R13 # save output file
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# Get root device [_start+0x66]
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50 ; PUSH_RAX # allocate stack for rootfs
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4989E0 ; COPY_R8_to_RSP # arg3 = &rootfs
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488905 29010000 ; LOADI64_rel_RDX %SIMPLE_FS_PROTOCOL_8 # EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID (last 64 bits)
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52 ; PUSH_RDX # push last 64 bits onto stack
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488905 19010000 ; LOADI64_rel_RDX %SIMPLE_FS_PROTOCOL # EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID (first 64 bits)
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52 ; PUSH_RDX # push first 64 bits onto stack
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4889E2 ; COPY_RDX_to_RSP # arg2 = &guid
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6A 01 ; PUSH !1 # arg6 = EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
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6A 00 ; PUSH !0 # arg5 = NULL
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4989E0 ; COPY_R8_to_RSP # arg4 = image_handle
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488B49 18 ; LOAD64_into_RCX_from_Address_RCX_Immediate8 !24 # arg1 = root_device = image->device
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4883EC 20 ; SUBI8_RSP !32 # allocate shadow stack space for UEFI function
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41FFD6 ; CALL_R14 # system->boot->open_protocol(root_device, &guid, &rootfs, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL)
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488B4C24 40 ; LOAD64_into_RCX_from_Address_RSP_Immediate8 !64 # get rootfs
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# Get root directory
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52 ; PUSH_RDX # allocate stack for rootdir
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4889E2 ; COPY_RDX_to_RSP # arg2 = &rootdir
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50 ; PUSH_RAX # allocate shadow stack space for UEFI function
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50 ; PUSH_RAX # allocate shadow stack space for UEFI function
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FF51 08 ; CALL_RCX_Immediate8 !8 # rootfs->open_volume(rootfs, &rootdir)
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58 ; POP_RAX # deallocate stack
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58 ; POP_RAX # deallocate stack
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415E ; POP_R14 # save &rootdir
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# Open file for writing
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52 ; PUSH_RDX # allocate stack for fout
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4889E2 ; COPY_RDX_to_RSP # arg2 = &fout
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6A 00 ; PUSH !0 # arg5 = 0
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6A 07 ; PUSH !7 # to get 0x8000000000000003 we set the rightmost 3 bits
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4159 ; POP_R9 # and then do right rotation by 1
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49D1C9 ; ROR_R9 # arg4 = EFI_FILE_MODE_CREATE| EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ
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4D89E8 ; COPY_R13_to_R8 # arg3 = out
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4C89F1 ; COPY_R14_to_RCX # arg1 = rootdir
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4883EC 20 ; SUBI8_RSP !32 # allocate shadow stack space for UEFI function
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FF51 08 ; CALL_RCX_Immediate8 !8 # rootdir->open()
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4C8B6C24 28 ; LOAD64_into_R13_from_Address_RSP_Immediate8 !40 # get fout
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# Open file for reading
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52 ; PUSH_RDX # allocate stack for fin
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4889E2 ; COPY_RDX_to_RSP # arg2 = &fin
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6A 01 ; PUSH !1 # arg5 = EFI_FILE_READ_ONLY
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6A 01 ; PUSH !1 # prepare to set arg4 to EFI_FILE_MODE_READ
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4159 ; POP_R9 # arg4 = EFI_FILE_MODE_READ
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4D89E0 ; COPY_R12_to_R8 # arg3 = in
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4C89F1 ; COPY_R14_to_RCX # arg1 = rootdir
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4883EC 20 ; SUBI8_RSP !32 # allocate shadow stack space for UEFI function
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FF51 08 ; CALL_RCX_Immediate8 !8 # rootdir->open()
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4C8B6424 28 ; LOAD64_into_R12_from_Address_RSP_Immediate8 !40 # get fin
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# Our flag for byte processing
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6A FF ; PUSH !-1
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5B ; POP_RBX # rbx = -1
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# temp storage for the sum
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31FF ; XOR_EDI_EDI # rdi = 0
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# :loop # [_start+0xE1]
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# Read a byte
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E8 6F000000 ; CALLI32 %read_byte
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# process byte
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E8 1C000000 ; CALLI32 %hex
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# deal with -1 values
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85C0 ; TEST_EAX_EAX
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7C F2 ; JL8 !loop
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# deal with toggle
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85DB ; TEST_EBX_EBX # jump if ebx >= 0
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7D 06 ; JGE8 !print
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# process first byte of pair
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89C7 ; COPY_EAX_to_EDI
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31DB ; XOR_EBX_EBX # rbx = 0
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EB E8 ; JMP8 !loop
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# process second byte of pair
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# :print [_start+0xF9]
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# update the sum and store in output
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C1E5 04 ; SHL_EBP_Immediate8 !4
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01F8 ; ADD_EAX_EDI
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# flip the toggle
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FFCB ; DEC_EBX # rbx = -1
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E8 39000000 ; CALLI32 %write_byte
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EB DA ; JMP8 !loop
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# :hex [_start+0x107]
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# Purge Comment Lines (#)
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3C 23 ; CMPI8_AL !35
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74 1E ; JE8 !purge_comment
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# Purge Comment Lines (;)
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3C 3B ; CMPI8_AL !59
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74 1A ; JE8 !purge_comment
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# deal all ascii less than '0'
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3C 30 ; CMPI8_AL !48
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7C 1F ; JL8 !ascii_other
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# deal with 0-9
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3C 3A ; CMPI8_AL !58
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7C 1F ; JL8 !ascii_num
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# deal with all ascii less than 'A'
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3C 41 ; CMPI8_AL !65
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7C 17 ; JL8 !ascii_other
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# deal with 'A'-'F'
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3C 47 ; CMPI8_AL !71
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7C 1C ; JL8 !ascii_high
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# deal with all ascii less than 'a'
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3C 61 ; CMPI8_AL !97
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7C 0F ; JL8 !ascii_other
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#deal with 'a'-'f'
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3C 67 ; CMPI8_AL !103
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7C 12 ; JL8 !ascii_low
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# The rest that remains needs to be ignored
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EB 09 ; JMP8 !ascii_other
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# :purge_comment [_start+0x129]
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# Read a byte
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E8 27000000 ; CALLI32 %read_byte
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# Loop if not LF
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3C 0A ; CMPI8_AL !10
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75 F7 ; JNE8 !purge_comment
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# Otherwise return -1
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# :ascii_other [_start+0x132]
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6A FF ; PUSH !-1
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58 ; POP_RAX # return = -1
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C3 ; RET
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# :ascii_num [_start+0x136]
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2C 30 ; SUBI8_AL !48
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C3 ; RET
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# :ascii_low [_start+0x139]
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2C 20 ; SUBI8_AL !32 # convert to uppercase
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||||||
|
# :ascii_high [_start+0x13B]
|
||||||
|
2C 37 ; SUBI8_AL !55
|
||||||
|
C3 ; RET
|
||||||
|
|
||||||
|
# Writes byte stored in al
|
||||||
|
# :write_byte [_start+0x13E]
|
||||||
|
4C89E9 ; COPY_R13_to_RCX # arg1 = fout
|
||||||
|
6A 01 ; PUSH !1 # size = 1
|
||||||
|
4889E2 ; COPY_RDX_to_RSP # arg2 = &size
|
||||||
|
50 ; PUSH_RAX # allocate stack
|
||||||
|
4989E0 ; COPY_R8_to_RSP # arg3 = &output
|
||||||
|
50 ; PUSH_RAX # allocate shadow stack space for UEFI function
|
||||||
|
50 ; PUSH_RAX # allocate shadow stack space for UEFI function
|
||||||
|
50 ; PUSH_RAX # allocate shadow stack space for UEFI function
|
||||||
|
FF51 28 ; CALL_RCX_Immediate8 !40 # fout->write()
|
||||||
|
4883C4 28 ; ADDI8_RSP !40 # deallocate stack
|
||||||
|
|
||||||
|
C3 ; RET # return
|
||||||
|
|
||||||
|
# :read_byte [_start+0x155]
|
||||||
|
4C89E1 ; COPY_R12_to_RCX # arg1 = fin
|
||||||
|
6A 01 ; PUSH !1 # size = 1
|
||||||
|
4889E2 ; COPY_RDX_to_RSP # arg2 = &size
|
||||||
|
56 ; PUSH_RSI # allocate stack
|
||||||
|
4989E0 ; COPY_R8_to_RSP # arg3 = &input
|
||||||
|
50 ; PUSH_RAX # allocate shadow stack space for UEFI function
|
||||||
|
50 ; PUSH_RAX # allocate shadow stack space for UEFI function
|
||||||
|
50 ; PUSH_RAX # allocate shadow stack space for UEFI function
|
||||||
|
FF51 20 ; CALL_RCX_Immediate8 !32 # fin->read()
|
||||||
|
58 ; POP_RAX # deallocate stack
|
||||||
|
58 ; POP_RAX # deallocate stack
|
||||||
|
58 ; POP_RAX # deallocate stack
|
||||||
|
58 ; POP_RAX # save input to rax
|
||||||
|
5E ; POP_RSI # save size to rsi
|
||||||
|
|
||||||
|
# If the file ended (0 bytes read) terminate
|
||||||
|
85F6 ; TEST_ESI_ESI # if size = 0
|
||||||
|
74 01 ; JE8 !terminate # then we are done
|
||||||
|
|
||||||
|
C3 ; RET # return
|
||||||
|
|
||||||
|
# :terminate [_start+0x171]
|
||||||
|
53 ; PUSH_RBX # allocate stack
|
||||||
|
4C89E1 ; COPY_R12_to_RCX # arg1 = fin
|
||||||
|
FF51 10 ; CALL_RCX_Immediate8 !16 # fin->close()
|
||||||
|
4C89E9 ; COPY_R13_to_RCX # arg1 = fout
|
||||||
|
FF51 10 ; CALL_RCX_Immediate8 !16 # fout->close()
|
||||||
|
|
||||||
|
4889EC ; COPY_RBP_to_RSP # restore stack
|
||||||
|
C3 ; RET # return to UEFI
|
||||||
|
|
||||||
|
|
||||||
|
# Protocol GUIDs
|
||||||
|
# :LOADED_IMAGE_PROTOCOL [_start+0x182]
|
||||||
|
A1 31 1B 5B ; %0x5b1b31a1
|
||||||
|
62 95 ; @0x9562
|
||||||
|
D2 11 ; @0x11d2
|
||||||
|
# :LOADED_IMAGE_PROTOCOL_8 [_start+0x18A]
|
||||||
|
8E 3F 00 A0 C9 69 72 3B ; !0x8e !0x3f !0 !0xa0 !0xc9 !0x69 !0x72 !0x3b
|
||||||
|
|
||||||
|
# :SIMPLE_FS_PROTOCOL [_start+0x192]
|
||||||
|
22 5B 4E 96 ; %0x0964e5b22
|
||||||
|
59 64 ; @0x6459
|
||||||
|
D2 11 ; @0x11d2
|
||||||
|
# :SIMPLE_FS_PROTOCOL_8 [_start+0x19A]
|
||||||
|
8E 39 00 A0 C9 69 72 3B ; !0x8e !0x39 !0 !0xa0 !0xc9 !0x69 !0x72 !0x3b
|
||||||
|
|
||||||
|
# [0x1A2]
|
Loading…
Reference in New Issue