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[Gcl-devel] Re: bfd_get_relocated_section_contents on hppa and ia64
From: |
Camm Maguire |
Subject: |
[Gcl-devel] Re: bfd_get_relocated_section_contents on hppa and ia64 |
Date: |
Fri, 22 Oct 2010 12:46:12 -0400 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) |
Greetings! I can't seem to find documentation anywhere on the sparc64
R_SPARC_OLO10 reloc, sometimes reported as a R_SPARC_LO10 and a
R_SPARC_13. I know there is a special addend encoded in the reloc
type. Can you explain to me or point out to me how this reloc is
supposed to work?
Take care,
Nick Clifton <address@hidden> writes:
> Hi Camm,
>
>> $ cat /tmp/hh.c
>> #include<stdio.h>
>>
>> int main(int argc,char *argv[]) {
>> printf("hello\n");
>> return 0;
>> }
>
>> Target: i486-linux-gnu
>
>> $ ./binutils/readelf -R .text /tmp/hh.o
>>
>> Hex dump of section '.text':
>> 0x00000000 5589e583 e4f083ec 10c70424 00000000 U..........$....
>> 0x00000010 e8ebffff ffb80000 0000c9c3 ............
>
> Ah ha! You have chosen a target architecture which just happens not
> use a special reloc to handle function calls. If you have a look at
> the relocs in the hh.o file:
>
> % readelf -r hh.o
> Relocation section '.rel.text' at offset 0x340 contains 2 entries:
> Offset Info Type Sym.Value Sym. Name
> 0000000c 00000501 R_386_32 00000000 .rodata
> 00000011 00000902 R_386_PC32 00000000 puts
>
> You will see that it only uses the R_386_32 (a 32-bit fixed-location
> reloc) and the R_386_PC32 (32-bit PC-relative) relocs. Both of which
> readelf implements because it can find them in debug sections.
>
> If you try compiling your test program for a different architecture,
> say the IA64, then:
>
> % ia64-elf-gcc -c hh.c
> % ia64-elf-readelf -R .text hh.o
> Hex dump of section '.text':
> readelf: Warning: unable to apply unsupported reloc type 134 to
> section .text
> readelf: Warning: unable to apply unsupported reloc type 135 to
> section .text
> readelf: Warning: unable to apply unsupported reloc type 73 to
> section .text
> 0x00000000 00181d0c 80054002 30004280 0167fc8c address@hidden
>
> Or the HPPA:
>
> % hppa-linux-gnu-gcc -c hh.c
> % hppa-linux-gnu-readelf -R .text hh.o
> Hex dump of section '.text':
> readelf: Warning: unable to apply unsupported reloc type 2 to
> section .text
> readelf: Warning: unable to apply unsupported reloc type 6 to
> section .text
> readelf: Warning: unable to apply unsupported reloc type 12 to
> section .text
> 0x00000000 6bc23fd9 08030241 081e0243 6fc10080 k.?....A...Co...
>
> Cheers
> Nick
>
>
>
>
--
Camm Maguire address@hidden
==========================================================================
"The earth is but one country, and mankind its citizens." -- Baha'u'llah
- [Gcl-devel] Re: bfd_get_relocated_section_contents on hppa and ia64,
Camm Maguire <=