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Date: Mon, 20 May 2013 18:11:28 +0200
From: Dániel Bali <balijanosdaniel@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: AMD GCN ISA development
Hello!
2013/5/19 Alexander Cherepanov <cherepan@...me.ru>
>
>
> objcopy --add-section etc.?
>
>
I tried this, but after trying to remove the .text section, so that I can
add it later, objcopy removed 4 sections from the binary. Here is what I
tried:
daniel@...l:~/gpu_dev/gcn_isa_sample$ objcopy -I elf32-little
--remove-section .text sample_42.bin sample_copy.bin
BFD: BFD (GNU Binutils for Ubuntu) 2.22 assertion fail ../../bfd/elf.c:1656
BFD: sample_42.bin: warning: Empty loadable segment detected, is this
intentional ?
daniel@...l:~/gpu_dev/gcn_isa_sample$ readelf -S sample_42.bin
There are 10 section headers, starting at offset 0x124:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk
Inf Al
[ 0] NULL 00000000 000000 000000 00 0
0 0
[ 1] .shstrtab STRTAB 00000000 0000fc 000028 00 0
0 0
[ 2] .text PROGBITS 00000000 0004c8 000880 00 0
0 0
[ 3] .data PROGBITS 00000000 000d48 001280 1280 0
0 0
[ 4] .symtab SYMTAB 00000000 001fc8 000050 10 5
1 0
[ 5] .strtab STRTAB 00000000 002018 000016 00 0
0 0
[ 6] .text PROGBITS 00000000 0025d2 000068 00 0
0 0
[ 7] .data PROGBITS 00000000 00263a 001280 1280 0
0 0
[ 8] .symtab SYMTAB 00000000 0038ba 000050 10 9
1 0
[ 9] .strtab STRTAB 00000000 00390a 000016 00 0
0 0
Key to Flags: (...)
daniel@...l:~/gpu_dev/gcn_isa_sample$ readelf -S sample_copy.bin
There are 6 section headers, starting at offset 0x25d8:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk
Inf Al
[ 0] NULL 00000000 000000 000000 00 0
0 0
[ 1] .data PROGBITS 00000000 0000b4 001280 1280 0
0 1
[ 2] .data PROGBITS 00000000 001334 001280 1280 0
0 1
[ 3] .shstrtab STRTAB 00000000 0025b4 000021 00 0
0 1
[ 4] .symtab SYMTAB 00000000 0026c8 000070 10 5
7 4
[ 5] .strtab STRTAB 00000000 002738 000015 00 0
0 1
Key to Flags: (...)
Is this because I'm passing a wrong ELF format to objcopy? I tried every
possible elf format and I always get the same error message.
Regars,
Daniel
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