On Sunday 07 April 2013 14:48:42 John David Anglin wrote: > On 7-Apr-13, at 2:39 PM, Mike Frysinger wrote: > > just to be clear, the only insn you need is: > > ble 0x100(%sr2, %r0); > > > > the kernel docs say sr2 holds the kernel gateway page (so i guess > > 0x100 is a > > known offset into that). the docs don't mention r0 that i can see, > > so i'm > > guessing it's one of those "always 0" registers ? > > Yes. There is also an entry at offset 0xb0 for light-weight- > syscalls. Currently, > this implements an atomic CAS operation used for pthread support. interesting. sounds like a poor man's vDSO. i'll document this the new vdso(7) man page. -mike
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