linux-kernel - Re: [PATCH 1/5] arm: LLVMLinux: Add current_stack

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Message-ID: <yw1xmwnp1txm.fsf@unicorn.mansr.com>
Date:	Fri, 06 Sep 2013 23:12:05 +0100
From:	Måns Rullgård <mans@...sr.com>
To:	behanw@...verseincode.com
Cc:	linux@....linux.org.uk, Will Deacon <will.deacon@....com>,
	Wade Farnsworth <wade_farnsworth@...tor.com>,
	Will Drewry <wad@...omium.org>,
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM PORT),
	linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH 1/5] arm: LLVMLinux: Add current_stack_pointer macro for ARM

behanw@...verseincode.com writes:

> +#define current_stack_pointer ({ \
> +	unsigned long current_sp; \
> +	asm ("mov %0, r13" : "=r" (current_sp)); \
> +	current_sp; \
> +})

Why do you use 'r13' rather than the more common 'sp' alias?

-- 
Måns Rullgård
mans@...sr.com
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