[OpenAFS-devel] What's the sparc code doing with the frame pointer in process.c?

[Derek Atkins]

Looks like it's building a new stack frame.

-derek

Adam Thornton <adam@fsf.net> writes:

> I'm still not getting processes to correctly dispatch under 1.0.2 on
> Linux/390. 
> 
> I notice that in the process.c code, that the sparc Linux contains an
> entry for the frame pointer register as well.  However, I really don't
> understand the line that makes use of it, namely:
> 
>    jmpBuffer[LWP_FP] = (jmp_buf_type)sp; 
> 
> Why are we setting the stack pointer into the frame pointer register
> (or, I guess, into the slot that's going to become the FP register in
> the longjmp, if you want to be pedantic)?  I don't want to try this code
> on the S/390 side until I understand what's going on here.
> 
> Adam
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
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