ELF, Program Header, convert virtual addresses to physical addresses

Ian Lance Taylor ian@airs.com
Thu Aug 18 17:43:00 GMT 2005


Torsten Mohr <tmohr@s.netic.de> writes:

> i try to convert virtual addresses in an ELF file to
> physical addresses, all based on the program header
> entries with p_type == PT_LOAD.

What is the context?  In other words, why do you want to do this?

> My first try to get the physical address P then was:
> 
> P = X - p_vaddr + p_paddr

That is correct for the way that the GNU toolchain uses p_paddr.  The
GNU toolchain uses p_paddr to represent the load address as set by the
AT modifier in a linker script.

> But that failed badly on an ELF file generated by a Greenhills
> toolchain for a NEC V850 and its program headers:
> readelf -l file.elf:
> Program Headers:
>   Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
>   LOAD           0x000240 0x00000000 0x00000000 0x00594 0x00594 R E 0
>   LOAD           0x000840 0x00000600 0x00000000 0x00010 0x00010 R E 0

Evidently Green Hills doesn't use p_paddr at all.  Presumably for them
p_paddr is always the same as p_vaddr.

Ian



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