Re: elf-powerpc pagesize discrepancy?

[Brendan Simon <brendan@dgs.monash.edu.au>]

"J.T. Conklin" wrote:

> I spent some time yesterday tracking down why the linker was adding an
> large amount of space between the end of the text and the beginning of
> the data segment in my images.  I tracked this down to the line:
>
>         ${RELOCATING+. ${DATA_ADDR- ALIGN(8) + ${MAXPAGESIZE}};}
>
> Which adjusts the address of the next page.  Normal enough, but I was
> suprised to discover that MAXPAGESIZE is defined to be 0x40000.  This
> struck me as an odd value for a processor with 4K pages.
>
> But I checked with the SysV ABI PPC Supplement and discovered that it
> allows operating systems to cluster physical pages into logical pages
> up to 0x10000 bytes in size (which cooresponds to ELF_MAXPAGESIZE in
> bfd/elf32-ppc.c).  But I can't find anything that refers to a 0x40000
> byte page.  Similarly, the SysV ABI recommends a 0x2000000 text start
> address, while we use 0x1800000.
>
> With an embedded target, I'm more interested with the physical page
> size.  As I checked the PowerPC EABI to see if it modified the page
> size and didn't find anything, it looks like I'll be writing a custom
> linker script.  But I thought I'd mention the discrepancy in case this
> matters on powerpc hosts.

Are the Sys V ABI PPC docs and the PowerPC EABI docs publicly available ?

If so, where can I download the latest docs from ?

Thanks,
Brendan Simon.