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Ange Albertini
102 lines
2.4 KiB
NASM
102 lines
2.4 KiB
NASM
; a simple Hello-World Mach-O
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; Ange Albertini, BSD Licence 2013
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BITS 32
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%include 'macho.inc'
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istruc mach_header
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at mach_header.magic, dd MH_MAGIC
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at mach_header.cputype, dd CPU_TYPE_I386
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at mach_header.cpusubtype, dd CPU_SUBTYPE_I386_ALL
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at mach_header.filetype, dd MH_EXECUTE
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at mach_header.ncmds, dd 2 ; segment, thread
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at mach_header.sizeofcmds, dd CMD_SIZE
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at mach_header.flags, dd MH_NOUNDEFS
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iend
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commands:
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textsc:
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istruc segment_command
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at segment_command.cmd, dd LC_SEGMENT
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at segment_command.cmdsize, dd TEXTSC_SIZE
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at segment_command.segname, db "__TEXT"
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at segment_command.vmaddr, dd 0
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at segment_command.vmsize, dd FILESIZE
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at segment_command.fileoff, dd 0
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at segment_command.filesize, dd FILESIZE
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at segment_command.maxprot, dd VM_PROT_READ + VM_PROT_WRITE + VM_PROT_EXECUTE
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at segment_command.initprot, dd VM_PROT_READ + VM_PROT_EXECUTE
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at segment_command.nsects, dd 2 ; text, cstring
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iend
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istruc section_
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at section_.sectname, db "__text"
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at section_.segname, db "__TEXT"
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at section_.addr, dd text
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at section_.size, dd TEXT_SIZE
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at section_.offset, dd text
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at section_.align, dd 4
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iend
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istruc section_
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at section_.sectname, db "__cstring"
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at section_.segname, db "__TEXT"
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at section_.addr, dd data
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at section_.size, dd DATA_SIZE
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at section_.offset, dd data
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at section_.align, dd 4
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iend
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TEXTSC_SIZE equ $ - textsc
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tc:
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istruc thread_command
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at thread_command.cmd, dd LC_UNIXTHREAD
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at thread_command.cmdsize, dd TC_SIZE
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at thread_command.flavor, dd x86_THREAD_STATE_32
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at thread_command.count, dd i386_thread_state_size >> 2
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iend
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istruc i386_thread_state
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at i386_thread_state.eip, dd text
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iend
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TC_SIZE equ $ - tc
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CMD_SIZE equ $ - commands
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align 16, db 0
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;******************************************************************************
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text:
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push MSG_LEN
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push msg
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push STDOUT_FILENO
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mov eax, SC_WRITE
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sub esp, 4
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int 80h
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add esp, 4 * 4 ; clearing arguments
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push 0 ; exit value
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mov eax, SC_EXIT
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sub esp, 4
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int 80h
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TEXT_SIZE equ $ - text
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align 16, db 0
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;******************************************************************************
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data:
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msg db 'Hello World!', 0ah
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MSG_LEN equ $ - msg
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DATA_SIZE equ $ - data
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FILESIZE equ $
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