ppc32 linux uc_mcontext changes

[Daniel Barlow]

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I hope this is the right place to send this question.  Sorry if I have
the wrong list.

In glibc 2.3.1 on the 32 bit PowerPC, it was possible to access
machine registers in a signal context (e.g. from a SA_SIGINFO signal
handler) by doing something like

   ((context->uc_mcontext.regs)->gpr[offset])

In 2.3.2 this fails with the message

  error: structure has no member named `regs'

It looks from brief inspection as though changes to the ucontext
structure were made for compatibility purposes with ppc64.  So this 
code should now be

   ((context->uc_mcontext.gregs)[offset]);

However, this breaks it in the older revision.  Is there some symbol
in 2.3.2 that I can use to distinguish it from 2.3.1 and so achieve
source compatibility across this minor version change?  Or is there,
he asks hopefully, a cleaner alternative?


- -dan

- -- 

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