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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130906222027.GR6617@n2100.arm.linux.org.uk>
Date:	Fri, 6 Sep 2013 23:20:27 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	behanw@...verseincode.com
Cc:	Will Deacon <will.deacon@....com>,
	Wade Farnsworth <wade_farnsworth@...tor.com>,
	Will Drewry <wad@...omium.org>,
	"moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] arm: LLVMLinux: Add current_stack_pointer macro
	for ARM

On Fri, Sep 06, 2013 at 05:28:07PM -0400, behanw@...verseincode.com wrote:
> From: Behan Webster <behanw@...verseincode.com>
> 
> A macro to get the current stack pointer which allows for a single place in
> which to do so with ASM. Before this named registers (a gcc extension) was used
> to get the stack pointer. Using ASM is a more portable way of getting the stack
> pointer which works with both gcc and clang.  This macro is of the same name
> used in the X86 arch.

This will result in less optimal code - rather than the compiler being
able to mask directly with 'sp', it's going to have to use this bit of
assembly to first move it into another register.

Why do we want this change?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/