Re: [PATCH, testsuite] Don't run SREC, IHEX and TEKHEX tests for MIPS N64.

["Maciej W. Rozycki" <macro at codesourcery dot com>]

On Wed, 3 Jul 2013, Luis Machado wrote:

> > if [istarget "alpha*-*-*"] then {
> >      # SREC etc cannot handle 64-bit addresses.  Force the test
> >      # program into the low 31 bits of the address space.
> >      lappend options "additional_flags=-Wl,-taso"
> > }
> > 
> > (For MIPS N64, if you wanted, I guess you could do similarly
> >   to Alpha, and rebuild with:
> > 
> >    lappend options "ldflags=-Wl,-Tdata=0x600000"
> > 
> >   to force use of low addresses.)
[...]
> 
> As for MIPS, attempting to force the use of low addresses, just like alpha,
> seems to do more than what the tools expect at the moment, and i get a SIGSEGV
> in the dynamic loader.

 Hmm, while (unlike Alpha's -taso option) there is no way to force an 
entire n64 MIPS process into the 31-bit address space, the dynamic 
executable itself should work just fine mapped low.  However the default 
linker script relies on the start address of the text (0x120000000, unless 
overridden) rather than data segment to get things right and moving the 
linker's output address pointer backwards in the middle of the binary 
being linker may yield strange results.  Can you try (or have you tried) 
-Ttext=... instead?

  Maciej