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Ange Albertini
90 lines
2.5 KiB
NASM
90 lines
2.5 KiB
NASM
; a simple Hello-World Mach-O
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; 64 bits and Mountain Lion (LC_MAIN) format
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; Ange Albertini, BSD Licence 2013
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BITS 64
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%include 'macho.inc'
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;###############################################################################
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istruc mach_header64
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at mach_header64.magic, dd MH_MAGIC_64
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at mach_header64.cputype, dd CPU_TYPE_X86_64
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at mach_header64.cpusubtype, dd CPU_SUBTYPE_I386_ALL | CPU_SUBTYPE_LIB64
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at mach_header64.filetype, dd MH_EXECUTE
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at mach_header64.ncmds, dd 4 ; segment, entry_point, dylinker, dylib
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at mach_header64.sizeofcmds, dd CMD_SIZE
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at mach_header64.flags, dd MH_NOUNDEFS
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iend
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load_commands:
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istruc segment_command64
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at segment_command64.cmd, dd LC_SEGMENT_64
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at segment_command64.cmdsize, dd segment_command64_size
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at segment_command64.vmsize, dq 0x1000 ; rounded up
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at segment_command64.filesize, dq FILE_SIZE
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at segment_command64.maxprot, dd VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE
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at segment_command64.initprot, dd VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE
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iend
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istruc entry_point_command
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at entry_point_command.cmd, dd LC_MAIN
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at entry_point_command.cmdsize, dd entry_point_command_size
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at entry_point_command.entryoff, dd start
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iend
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dylinker
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istruc dylinker_command
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at dylinker_command.cmd, dd LC_LOAD_DYLINKER
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at dylinker_command.cmdsize, dd DYLINKER_SIZE
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at dylinker_command.name, dd dylinker_name - dylinker
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iend
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dylinker_name db '/usr/lib/dyld'
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align 4, db 0
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DYLINKER_SIZE equ $ - dylinker
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dylib:
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istruc dylib_command
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at dylib_command.cmd, dd LC_LOAD_DYLIB
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at dylib_command.cmdsize, dd DYLIB_SIZE
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at dylib_command.name, dd dylib_name - dylib
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iend
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dylib_name db '/usr/lib/libSystem.B.dylib'
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align 4, db 0
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DYLIB_SIZE equ $ - dylib
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CMD_SIZE equ $ - load_commands
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align 16, db 0
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;###############################################################################
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start:
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mov rdx, MSG_LEN
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mov rsi, msg
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mov rdi, STDOUT_FILENO
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mov rax, ((SYSCALL_CLASS_UNIX << SYSCALL_CLASS_SHIFT) | (SYSCALL_NUMBER_MASK & (SC_WRITE)))
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syscall
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mov rdi, 0
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mov rax, ((SYSCALL_CLASS_UNIX << SYSCALL_CLASS_SHIFT) | (SYSCALL_NUMBER_MASK & (SC_EXIT)))
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syscall
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align 16, db 0
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;###############################################################################
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msg db 'Hello World!', 0ah
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MSG_LEN EQU $ - msg
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;###############################################################################
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FILE_SIZE EQU $ - $$
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