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Date: Fri, 13 Jan 2017 16:39:27 +0800 From: Herbert Xu <herbert@...dor.apana.org.au> To: Andy Lutomirski <luto@...capital.net> Cc: Josh Poimboeuf <jpoimboe@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux Crypto Mailing List <linux-crypto@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Andy Lutomirski <luto@...nel.org>, Ard Biesheuvel <ard.biesheuvel@...aro.org> Subject: Re: x86-64: Maintain 16-byte stack alignment On Thu, Jan 12, 2017 at 05:46:55PM -0800, Andy Lutomirski wrote: > > What I mean is: what guarantees that the stack is properly aligned for > the subroutine call? gcc promises to set up a stack frame, but does > it promise that rsp will be properly aligned to call a C function? Yes, as long as you don't go behind its back and start directly pushing things onto the stack with inline asm. Cheers, -- Email: Herbert Xu <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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