98 lines
3.8 KiB
Text
98 lines
3.8 KiB
Text
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#------------------------------------------------------------------------------
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# $File: coff,v 1.7 2022/11/21 22:30:22 christos Exp $
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# coff: file(1) magic for Common Object Files not specific to known cpu types or manufactures
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#
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# COFF
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#
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# by Joerg Jenderek at Oct 2015, Feb 2021
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# https://en.wikipedia.org/wiki/COFF
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# https://de.wikipedia.org/wiki/Common_Object_File_Format
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# http://www.delorie.com/djgpp/doc/coff/filhdr.html
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# display name+variables+flags of Common Object Files Format (32bit)
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# Maybe used also in adi,att3b,clipper,hitachi-sh,hp,ibm6000,intel,
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# mips,motorola,msdos,osf1,sharc,varied.out,vax
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0 name display-coff
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# test for unused flag bits (0x8000,0x0800,0x0400,0x0200,x0080) in f_flags
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>18 uleshort&0x8E80 0
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# skip DOCTOR.DAILY READER.NDA REDBOX.ROOT by looking for positive number of sections
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>>2 uleshort >0
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# skip ega80woa.fnt svgafix.fnt HP3FNTS1.DAT HP3FNTS2.DAT INTRO.ACT LEARN.PIF by looking for low number of sections
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>>>2 uleshort <4207
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>>>>0 clear x
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# f_magic - magic number
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# DJGPP, 80386 COFF executable, MS Windows COFF Intel 80386 object file (./intel)
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>>>>0 uleshort 0x014C Intel 80386
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# Hitachi SH big-endian COFF (./hitachi-sh)
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>>>>0 uleshort 0x0500 Hitachi SH big-endian
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# Hitachi SH little-endian COFF (./hitachi-sh)
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>>>>0 uleshort 0x0550 Hitachi SH little-endian
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# executable (RISC System/6000 V3.1) or obj module (./ibm6000)
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#>>>>0 uleshort 0x01DF
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# MS Windows COFF Intel Itanium, AMD64
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# https://msdn.microsoft.com/en-us/library/windows/desktop/ms680313(v=vs.85).aspx
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>>>>0 uleshort 0x0200 Intel ia64
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>>>>0 uleshort 0x8664 Intel amd64
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# ARM COFF (./arm)
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>>>>0 uleshort 0xaa64 Aarch64
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>>>>0 uleshort 0x01c0 ARM
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>>>>0 uleshort 0xa641 ARM64EC
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>>>>0 uleshort 0x01c2 ARM Thumb
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>>>>0 uleshort 0x01c4 ARMv7 Thumb
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# TODO for other COFFs
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#>>>>0 uleshort 0xABCD COFF_TEMPLATE
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>>>>0 default x
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>>>>>0 uleshort x type %#04x
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>>>>0 uleshort x COFF
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# F_EXEC flag bit
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>>>>18 leshort ^0x0002 object file
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!:mime application/x-coff
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!:ext o/obj/lib
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# no cof sample found
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#!:ext cof/o/obj/lib
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>>>>18 leshort &0x0002 executable
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#!:mime application/x-coffexec
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# F_RELFLG flag bit,static object
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>>>>18 leshort &0x0001 \b, no relocation info
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# F_LNNO flag bit
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>>>>18 leshort &0x0004 \b, no line number info
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# F_LSYMS flag bit
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>>>>18 leshort &0x0008 \b, stripped
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>>>>18 leshort ^0x0008 \b, not stripped
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# flags in other COFF versions
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#0x0010 F_FDPR_PROF
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#0x0020 F_FDPR_OPTI
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#0x0040 F_DSA
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# F_AR32WR flag bit
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#>>>>18 leshort &0x0100 \b, 32 bit little endian
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#0x1000 F_DYNLOAD
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#0x2000 F_SHROBJ
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#0x4000 F_LOADONLY
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# f_nscns - number of sections like: 1 2 3 4 5 7 8 9 11 12 15 16 19 20 21 22 26 30 36 40 42 56 80 89 96 124
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>>>>2 uleshort <2 \b, %u section
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>>>>2 uleshort >1 \b, %u sections
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# f_symptr - symbol table pointer, only for not stripped
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# like: 0 0x7c 0xf4 0x104 0x182 0x1c2 0x1c6 0x468 0x948 0x416e 0x149a6 0x1c9d8 0x23a68 0x35120 0x7afa0
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>>>>8 ulelong >0 \b, symbol offset=%#x
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# f_nsyms - number of symbols, only for not stripped
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# like: 0 2 7 9 10 11 20 35 41 63 71 80 105 146 153 158 170 208 294 572 831 1546
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>>>>12 ulelong >0 \b, %d symbols
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# f_opthdr - optional header size. An object file should have a value of 0
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>>>>16 uleshort >0 \b, optional header size %u
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# f_timdat - file time & date stamp only for little endian
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>>>>4 ledate >0 \b, created %s
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# at offset 20 can be optional header, extra bytes FILHSZ-20 because
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# do not rely on sizeof(FILHDR) to give the correct size for header.
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# or first section header
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# additional variables for other COFF files
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>>>>16 uleshort =0
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# first section name s_name[8] like: .text .data .debug$S .drectve .testseg
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>>>>>20 string x \b, 1st section name "%.8s"
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# >20 beshort 0407 (impure)
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# >20 beshort 0410 (pure)
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# >20 beshort 0413 (demand paged)
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# >20 beshort 0421 (standalone)
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# >22 leshort >0 - version %d
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# >168 string .lowmem Apple toolbox
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