32-bit signal contexts missing dar, dsisr, trap

Peter Bergner bergner at vnet.ibm.com
Wed Feb 19 02:30:27 EST 2003

Gary Byers wrote:
> When setting up the signal frame for a 32-bit signal handler, current
> versions (2.5.61 from kernel.org, 2.4.21-pre4 with recent patches from
> penguinppc64.org) of the ppc64 kernel neglect to copy the dar, dsisr,
> and trap fields (at least) from the 64-bit register context to the
> handler's 32-bit context.
> Somewhat oddly, in both kernels the functions 'setup_frame32' and
> 'setup_rt_frame32' copy a slightly different set of registers/state
> information: setup_rt_frame32() copies the MQ register and
> setup_rt_frame32() doesn't.  (I honestly don't know if there are
> machines that can run the ppc64 kernel that -have- MQ registers or
> not.)
> Perhaps this would be clearer if the loop that copies the 32 "real"
> GPRs were just extended to copy up to and including PT_RESULT ?

I'll take a look at this.  Thanks.


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