Maamoun TK <maamoun...@googlemail.com> writes:
> I'm thinking what could happen if an exception raised while the stack frame
> is modified incorrectly, the exception handler will try to look at the
> calling function but it can't get the previous state of stack pointer
> because the stack pointer doesn't point to it and that will mess the
> exception handling procedure. So we can't ignore the rules whatsoever and
> we have to modify the stack frame correctly.
Hmm. I agree just lowering the stack pointer sounds a bit questionable.
But if we use some other register to point into the protected zone, we
should be fine? E.g.,
addi r10, r1, -0x40 C Save callee-save registers
stvx v20, 0, r10
stvx v21, r6, r10
stvx v22, r7, r10
stvx v23, r8, r10
Regards,
/Niels
--
Niels Möller. PGP-encrypted email is preferred. Keyid 368C6677.
Internet email is subject to wholesale government surveillance.
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