Re: x86-64: Maintain 16-byte stack alignment
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: 2017-01-13 08:40:00
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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 [off-list ref] Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt