From: Miod Vallat <miod@online.fr>
To: linux-mips@linux-mips.org
Subject: Re: gcc-4.8+ and R10000+
Date: Mon, 8 Sep 2014 08:11:51 +0000 (UTC) [thread overview]
Message-ID: <loom.20140908T100138-568@post.gmane.org> (raw)
In-Reply-To: 540C165F.7030307@gentoo.org
> Disassembling a statically-built copy of the "sln" binary generated by
> glibc's compile phase, there are slight differences in how gcc-4.7 and
> gcc-4.8 are compiling the __lll_lock_wait_private function. The key
> differences in the output asm are
> this:
[...]
> gcc-4.8:
> x+4 <START>
> ...
> x+24 bne v1,v0,<x+56>
> ...
> x+32 0x7c03e83b /* rdhwr */
> x+36 li a2,2
> x+40 lw a1,-29832(v1)
> x+44 move a3,zero
> x+48 li v0,4238
> x+52 syscall
> * x+56 ll v0,0(s0)
> * x+60 li at,2
> * x+64 sc at,0
Note how the sc address is no longer 0(s0). Since the address does
not match the address used in the ll instruction, sc will always
fail on the R10k.
Miod
next prev parent reply other threads:[~2014-09-08 8:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-07 8:25 gcc-4.8+ and R10000+ Joshua Kinard
2014-09-08 8:11 ` Miod Vallat [this message]
2014-09-08 9:44 ` Joshua Kinard
2014-09-22 9:31 ` Joshua Kinard
2014-09-22 9:31 ` Joshua Kinard
2014-09-28 19:34 ` Maciej W. Rozycki
2014-09-29 5:18 ` Joshua Kinard
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