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Date: Thu, 4 Feb 2016 18:52:47 -0500
From: Rich Felker <dalias@...c.org>
To: Mahesh Bodapati <Mahesh.Bodapati@...tec.com>
Cc: Szabolcs Nagy <nsz@...t70.net>,
Jaydeep Patil <Jaydeep.Patil@...tec.com>,
Anand Takale <Anand.Takale@...tec.com>, musl@...ts.openwall.com
Subject: Re: Re: mips n64 porting review
On Wed, Feb 03, 2016 at 06:36:57PM -0500, Rich Felker wrote:
> On Wed, Feb 03, 2016 at 03:41:13PM +0000, Mahesh Bodapati wrote:
> > Hi Rich,
> > I have attached the patch which has all the MIPS n64 porting work. I
> > have created mips64port remote branch on GitHub and the repository
> > is https://github.com/MaheshBodapati/musl/tree/mips64port which has
> > the broken down patches and the base revision on which I have
> > prepared patch is v1.1.12-41-g3abb094.
>
> Some preliminary review:
One more thing that came up in reviewing syscall_cp.s was actually a
bug copied from existing code in musl, which is fixed by this commit:
http://git.musl-libc.org/cgit/musl/commit/?id=756c8af8589265e99e454fe3adcda1d0bc5e1963
In practice the code seemed to work but it was wrong with respect to
ABI requirements.
I think the way you're saving $gp on the stack in sigsetjmp.s is also
invalid since that part of the stack will have been clobbered by the
time setjmp returns a second time. You could save it inside an unused
part of the jump buffer, but it might be better to just avoid the $gp
register and instead use temp registers and possibly some pc-relative
address computations.
Rich
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