Messages in this thread | | | Date | Thu, 18 Feb 2010 23:57:11 +0100 | From | Pavel Machek <> | Subject | Re: register long sp asm("r1") incorrect |
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On Mon 2010-02-15 14:15:17, H. Peter Anvin wrote: > On 02/15/2010 01:04 PM, Benjamin Herrenschmidt wrote: > > > > It's true that most other use of it we have are global scope (local_paca > > in r13, glibc use of r2/r13, etc...) afaik, but since r1 itself is the > > stack pointer always, I think they pretty much guarantee it works. > > > > It should work, because r1, being the stack pointer, is already marked a > reserved register in gcc. > > The reference Pavel is citing bascially states that gcc won't globally > reserve the register, which is true, but it is already reserved anyway.
Ok, thanks for clarification.
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