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Re: SH: ____longjmp_chk for GNU/Linux with sigaltstack support

From: Thomas Schwinge <thomas at codesourcery dot com>
To: libc-alpha at sourceware dot org, Kaz Kojima <kkojima at rr dot iij4u dot or dot jp>
Date: Wed, 13 Jun 2012 12:41:10 +0200
Subject: Re: SH: ____longjmp_chk for GNU/Linux with sigaltstack support
References: <877gvb7bgr.fsf@schwinge.name>

Hi!

On Wed, 13 Jun 2012 12:28:04 +0200, I wrote:
> 	* sysdeps/unix/sysv/linux/sh/____longjmp_chk.S: New file, based on
> 	sysdeps/sh/____longjmp_chk.S.

I forgot to say: this code if not optimal because of the four registers
that are spilled onto the stack around the sigaltstack system call, but I
implemented it this way in order to avoid restructuring all the different
cases in sysdeps/sh/sh{3,4}/__longjmp.S -- ____longjmp_chk surely is not
used in a time-critical execution path, and it's only a few additional
CPU instructions/memory cycles anyway.

GrÃÃe,
 Thomas

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References:
- SH: ____longjmp_chk for GNU/Linux with sigaltstack support
  - From: Thomas Schwinge

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