Re: [PATCH 2/3] x86: Pass in pt_regs pointer for syscalls that need it
From: H. Peter Anvin
Date: Wed Feb 11 2009 - 14:50:51 EST
Brian Gerst wrote:
I guess I could go back to extracting the args from the pt_regs struct
given just the pointer. How do you intend to handle system calls in
your changes (normal ones, not needing pt_regs)?
My plan was to by default load up the three first arguments in (%eax,
%edx, %ecx) followed by the remaining arguments on the stack... I
currently have it as a reorganized struct pt_regs, but I'm still trying
to figure out if it would make more sense from a correctness and
performance perspective to instead have duplicates of these entries.
For the pt_regs-using registers, they would need a tiny trampoline,
looking like:
leal 16(%esp),%eax
jmp <real function>
-hpa
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