[parisc-linux] Re: schedule_tail

[Alan Modra]

On Wed, 21 Feb 2001, Matthew Wilcox wrote:

> It does a lot of important stuff on SMP though.

I'm not denying that :)

>  It does the stack adjust
> before calling because the disassembled 32-bit SMP code looks like this:
> 101186f4 <schedule_tail>:
> 101186f4:       08 03 02 41     copy r3,r1
> 101186f8:       08 1e 02 43     copy sp,r3
> 101186fc:       6b c2 3f d9     stw rp,-14(sr0,sp)
> 
> and we don't want to trash what was below the sp.

But this location is allowed to be modified by the callee, and I think you
already have a stack frame.

I wrote up some stuff on stack frames at
http://lists.parisc-linux.org/pipermail/parisc-linux/2001-February/011715.html

Alan