[PATCH][MIPS] Add linker emulation for N64 ABI with forced 32-bit symbols

Maxim Kuvyrkov maxim@codesourcery.com
Thu Nov 15 22:21:00 GMT 2012


On 16/11/2012, at 11:08 AM, Richard Sandiford wrote:

> Maxim Kuvyrkov <maxim@codesourcery.com> writes:
>> 
...
>> Tested by building complete MIPS64 toolchain (including glibc) with -msym32.
>> 
>> OK to apply?
> 
> Huh.  I'm very much against the original change to the n64 TEXT_START_ADDR.
> See this previous discussion on the topic:
> 
>    http://sourceware.org/ml/binutils/2008-06/msg00285.html
> 
> The justification for changing TEXT_START_ADDR from a 32-bit value to a
> larger value was that it would show users if their code was non-portable,
> because anything that assumed 32-bit addresses would now fault.  But that
> seems to me like the tools lecturing to the user.  As I said in that thread,
> I think users who want to smoke out such portability problems (by making
> sure that the lower 4GB aren't mapped) should be the ones who need to do
> something special.
> 
> I think we should simply revert to a 32-bit TEXT_START_ADDR for all
> n64 emulations.  This time I'm even in a position to approve it :-)
> 
> That has the advantage that no GCC patches are needed.  Users who
> want this functionality can just upgrade their binutils.

I'm fine with this.  I'll hold off posting the GCC patch under the assumption that it will not be necessary.

Thank you,

--
Maxim Kuvyrkov
CodeSourcery / Mentor Graphics






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