Brad Boyer <flar@xxxxxxxxxxxxx> writes:
On Tue, Aug 18, 2009 at 11:07:26AM +0400, Maxim Kuvyrkov wrote:
The reason for this calling convention is to minimize difference in
invokation of the vDSO helper and the syscall. The helper gets its
arguments in a0 (mem), d0 (oldval) and d1 (newval); in a stub, which is
used when vDSO is not available, one then can do:
movel %d0,%a1
movel #NR,%d0
trap #0
Then wouldn't it make sense to use %d2 instead of %a1?
d2 is a callee-saved register, a1 isn't.
Andreas.
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Andreas Schwab, schwab@xxxxxxxxxxxxxx
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