On Sun, Aug 21, 2011 at 09:37:18AM -0400, Andrew Lutomirski wrote: > Gack. Is this a holdover from the 32-bit code that shares the > argument save area with the parameters passed on the C stack? If so, > we could just set up the argument save area honestly and pass the real > parameters in registers like 64-bit C code expects. > > If the tracing and restart cases use iret to return to userspace, this > should all just work. ptrace users shouldn't notice the overhead, and > syscall restart is presumably slow enough anyway that it wouldn't > matter. The userspace entry code would be as simple as: > > sysenter > ret > > or > > sysexit > ret
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