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Re: the question about PT_DYNAMIC's p_offset value in elf file formips platform

From: Nick Clifton <nickc at redhat dot com>
To: eagle_zhou at ali dot com dot tw
Cc: binutils at sources dot redhat dot com
Date: Tue, 26 Oct 2004 09:30:11 +0100
Subject: Re: the question about PT_DYNAMIC's p_offset value in elf file formips platform
References: <OF26A32954.009E236B-ON48256F39.00275226@LocalDomain>

Hi Eagle,

> I do not know why PT_DYNAMIC's p_offset is 0x0000ac. I think the
> correct value should be 0x1008.

The PT_DYNAMIC segment includes more than just the .dynamic section. It also includes sections like .hash, .dynsym etc. Hence the segment starts at the lowest offset of all of these sections, which in this case is the .hash section.

If you have a look at the section to segment mapping output from readelf:

      Section to Segment mapping:
       Segment Sections...
        00     .hash .dynsym .dynstr .text .MIPS.stubs .rel.dyn
        01     .data .dynamic .got .bss
        02     .reginfo .hash .dynsym .dynstr .text .MIPS.stubs .data
.dynamic .debug_aranges .debug_pubnames .debug_info .debug_abbrev
.debug_line .debug_frame .debug_str .pdr .rel.dyn .compact_rel .shstrtab
.symtab

You can see the relationship between segments and sections.

Cheers
  Nick

References:
- the question about PT_DYNAMIC's p_offset value in elf file for mipsplatform
  - From: eagle_zhou

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