Messages in this thread | | | Subject | Re: [PATCH 2/2] x86/asm: Fix inline asm call constraints for clang | From | "H. Peter Anvin" <> | Date | Wed, 20 Sep 2017 10:46:24 -0700 |
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On 09/20/17 10:38, Dmitry Vyukov wrote: > > I think we need just the frame itself and RSP pointing below this > frame. If we don't have a frame, CALL instruction will smash whatever > RSP happens to point to. Compiler doesn't have to setup RSP to point > below used part of stack in leaf functions. >
In the kernel it does. Redzoning is not allowed in the kernel, because interrupts or exceptions would also smash the redzone.
-hpa
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