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SubjectRe: magic file entry to understand core dumps
Date
Terry Dawson <terry@perf.no.itg.telecom.com.au> writes:

> I don't know whether it works 100% of the time or not, but the magic
> file from Debian-1.1 seems to do this ok.

It won't. It will probably work on most Linux i386 ELF core dumps,
but is broken for any other type of ELF core dump, including SVR4 core
dumps (it will probably output garbage).

This should be a little more reliable.

Dan

------- start of cut text --------------

#------------------------------------------------------------------------------
# elf: file(1) magic for ELF executables
#
# We have to check the byte order flag to see what byte order all the
# other stuff in the header is in.
#
# Byte order is probably big-endian for MIPS RS3000 and Amdahl.
# MIPS RS3000 may also be for MIPS RS2000.
#
# The ELF core format is unspecified and varies between different
# operating systems.
#
# updated by Daniel Quinlan (Daniel.Quinlan@linux.org)
0 string \177ELF ELF
>4 byte 0 invalid class
>4 byte 1 32-bit
>4 byte 2 64-bit
>5 byte 0 invalid byte order
>5 byte 1 LSB
>>16 leshort 0 no file type,
>>16 leshort 1 relocatable,
>>16 leshort 2 executable,
>>16 leshort 3 shared object,
>>16 leshort 4 core file
# begin Linux core dumps
>>>18 leshort 3
>>>544 string CORE
>>>>576 string >\0 from '%s'
>>>>400 lelong >0 (signal %d)
# end
>>16 leshort &0xff00 processor-specific,
>>18 leshort 0 \b, no machine,
>>18 leshort 1 \b, AT&T WE32100 - invalid byte order,
>>18 leshort 2 \b, SPARC - invalid byte order,
>>18 leshort 3 \b, Intel 80386,
>>18 leshort 4 \b, Motorola 68000 - invalid byte order,
>>18 leshort 5 \b, Motorola 88000 - invalid byte order,
>>18 leshort 6 \b, Intel 80486,
>>18 leshort 7 \b, Intel 80860,
>>18 leshort 8 \b, MIPS RS3000,
>>18 leshort 9 \b, Amdahl,
>>20 lelong 0 invalid version
>>20 lelong 1 version 1
>>36 lelong 1 MathCoPro/FPU/MAU Required
>5 byte 2 MSB
>>16 beshort 0 no file type,
>>16 beshort 1 relocatable,
>>16 beshort 2 executable,
>>16 beshort 3 shared object,
>>16 beshort 4 core file,
>>16 beshort &0xff00 processor-specific,
>>18 beshort 0 no machine,
>>18 beshort 1 AT&T WE32100,
>>18 beshort 2 SPARC,
>>18 beshort 3 Intel 80386 - invalid byte order,
>>18 beshort 4 Motorola 68000,
>>18 beshort 5 Motorola 88000,
>>18 beshort 6 Intel 80486 - invalid byte order,
>>18 beshort 7 Intel 80860,
>>18 beshort 8 MIPS RS3000,
>>18 leshort 9 Amdahl,
>>20 belong 0 invalid version
>>20 belong 1 version 1
>>36 belong 1 MathCoPro/FPU/MAU Required
------- end ----------------------------

--
Daniel Quinlan Member of the League for Programming Freedom
quinlan@bucknell.edu


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