#------------------------------------------------------------------------------ # $File: coff,v 1.6 2021/04/26 15:56:00 christos Exp $ # coff: file(1) magic for Common Object Files not specific to known cpu types or manufactures # # COFF # # by Joerg Jenderek at Oct 2015, Feb 2021 # https://en.wikipedia.org/wiki/COFF # https://de.wikipedia.org/wiki/Common_Object_File_Format # http://www.delorie.com/djgpp/doc/coff/filhdr.html # display name+variables+flags of Common Object Files Format (32bit) # Maybe used also in adi,att3b,clipper,hitachi-sh,hp,ibm6000,intel, # mips,motorola,msdos,osf1,sharc,varied.out,vax 0 name display-coff # test for unused flag bits (0x8000,0x0800,0x0400,0x0200,x0080) in f_flags >18 uleshort&0x8E80 0 # skip DOCTOR.DAILY READER.NDA REDBOX.ROOT by looking for positive number of sections >>2 uleshort >0 # skip ega80woa.fnt svgafix.fnt HP3FNTS1.DAT HP3FNTS2.DAT INTRO.ACT LEARN.PIF by looking for low number of sections >>>2 uleshort <4207 >>>>0 clear x # f_magic - magic number # DJGPP, 80386 COFF executable, MS Windows COFF Intel 80386 object file (./intel) >>>>0 uleshort 0x014C Intel 80386 # Hitachi SH big-endian COFF (./hitachi-sh) >>>>0 uleshort 0x0500 Hitachi SH big-endian # Hitachi SH little-endian COFF (./hitachi-sh) >>>>0 uleshort 0x0550 Hitachi SH little-endian # executable (RISC System/6000 V3.1) or obj module (./ibm6000) #>>>>0 uleshort 0x01DF # MS Windows COFF Intel Itanium, AMD64 # https://msdn.microsoft.com/en-us/library/windows/desktop/ms680313(v=vs.85).aspx >>>>0 uleshort 0x0200 Intel ia64 >>>>0 uleshort 0x8664 Intel amd64 # ARM COFF (./arm) >>>>0 uleshort 0xaa64 Aarch64 >>>>0 uleshort 0x01c0 ARM >>>>0 uleshort 0x01c2 ARM Thumb >>>>0 uleshort 0x01c4 ARMv7 Thumb # TODO for other COFFs #>>>>0 uleshort 0xABCD COFF_TEMPLATE >>>>0 default x >>>>>0 uleshort x type %#04x >>>>0 uleshort x COFF # F_EXEC flag bit >>>>18 leshort ^0x0002 object file !:mime application/x-coff !:ext o/obj/lib # no cof sample found #!:ext cof/o/obj/lib >>>>18 leshort &0x0002 executable #!:mime application/x-coffexec # F_RELFLG flag bit,static object >>>>18 leshort &0x0001 \b, no relocation info # F_LNNO flag bit >>>>18 leshort &0x0004 \b, no line number info # F_LSYMS flag bit >>>>18 leshort &0x0008 \b, stripped >>>>18 leshort ^0x0008 \b, not stripped # flags in other COFF versions #0x0010 F_FDPR_PROF #0x0020 F_FDPR_OPTI #0x0040 F_DSA # F_AR32WR flag bit #>>>>18 leshort &0x0100 \b, 32 bit little endian #0x1000 F_DYNLOAD #0x2000 F_SHROBJ #0x4000 F_LOADONLY # 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 >>>>2 uleshort <2 \b, %u section >>>>2 uleshort >1 \b, %u sections # f_symptr - symbol table pointer, only for not stripped # like: 0 0x7c 0xf4 0x104 0x182 0x1c2 0x1c6 0x468 0x948 0x416e 0x149a6 0x1c9d8 0x23a68 0x35120 0x7afa0 >>>>8 ulelong >0 \b, symbol offset=%#x # f_nsyms - number of symbols, only for not stripped # like: 0 2 7 9 10 11 20 35 41 63 71 80 105 146 153 158 170 208 294 572 831 1546 >>>>12 ulelong >0 \b, %d symbols # f_opthdr - optional header size. An object file should have a value of 0 >>>>16 uleshort >0 \b, optional header size %u # f_timdat - file time & date stamp only for little endian >>>>4 ledate >0 \b, created %s # at offset 20 can be optional header, extra bytes FILHSZ-20 because # do not rely on sizeof(FILHDR) to give the correct size for header. # or first section header # additional variables for other COFF files >>>>16 uleshort =0 # first section name s_name[8] like: .text .data .debug$S .drectve .testseg >>>>>20 string x \b, 1st section name "%.8s" # >20 beshort 0407 (impure) # >20 beshort 0410 (pure) # >20 beshort 0413 (demand paged) # >20 beshort 0421 (standalone) # >22 leshort >0 - version %d # >168 string .lowmem Apple toolbox |