From: Mike Frysinger <vapier@gentoo.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] [x86] Wrap small helper functions from libgcc to avoid an ABI mismatch
Date: Tue, 8 Nov 2011 08:33:06 -0500 [thread overview]
Message-ID: <201111080833.14523.vapier@gentoo.org> (raw)
In-Reply-To: <1320744464-833-1-git-send-email-gabeblack@chromium.org>
On Tuesday 08 November 2011 04:27:44 Gabe Black wrote:
> When gcc compiles some 64 bit operations on a 32 bit machine, it generates
> calls to small functions instead of instructions which do the job directly.
> Those functions are defined in libgcc and transparently provide whatever
> functionality was necessary. Unfortunately, u-boot can be built with a
> non-standard ABI when libgcc isn't. When the two are linked together, very
> confusing bugs can crop up, for instance seemingly normal integer division
> or modulus getting the wrong answer or even raising a spurious divide by
> zero exception.
might be good to explicitly mention that this is due to u-boot using -mregparm
> --- a/arch/x86/config.mk
> +++ b/arch/x86/config.mk
>
> +LDSCRIPT := $(SRCTREE)/$(CPUDIR)/u-boot.lds
looks like some old code sneaked in. bad rebase ?
-mike
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next prev parent reply other threads:[~2011-11-08 13:33 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-08 9:27 [U-Boot] [PATCH] [x86] Wrap small helper functions from libgcc to avoid an ABI mismatch Gabe Black
2011-11-08 13:33 ` Mike Frysinger [this message]
2011-11-08 22:27 ` Gabe Black
2011-11-08 22:34 ` [U-Boot] [PATCH v2] x86: " Gabe Black
2011-11-08 23:14 ` Graeme Russ
2011-11-09 4:49 ` Mike Frysinger
2011-11-09 3:57 ` Graeme Russ
2011-11-09 5:34 ` Mike Frysinger
2011-11-17 9:01 ` [U-Boot] [PATCH v3] " Gabe Black
2011-11-17 9:13 ` Gabe Black
2011-11-30 11:03 ` Graeme Russ
2011-11-09 3:05 ` [U-Boot] [PATCH v2] " Graeme Russ
2011-11-09 10:32 ` [U-Boot] [RFC] x86: Do no use reparm as it break libgcc linkage Graeme Russ
2011-11-09 17:12 ` Mike Frysinger
2011-11-09 21:42 ` Graeme Russ
2011-11-10 4:13 ` Mike Frysinger
2011-11-10 4:22 ` Graeme Russ
2011-11-10 5:10 ` Graeme Russ
2011-11-10 17:15 ` Mike Frysinger
2011-11-10 22:53 ` Graeme Russ
2011-11-11 0:23 ` Mike Frysinger
2011-11-11 1:23 ` Graeme Russ
2011-11-11 1:40 ` Mike Frysinger
2011-11-11 1:51 ` Graeme Russ
2011-11-11 1:55 ` Mike Frysinger
2011-11-11 1:59 ` Graeme Russ
2011-11-11 2:10 ` Gabe Black
2011-11-11 2:22 ` Graeme Russ
2011-11-11 2:41 ` Gabe Black
2011-11-11 4:49 ` Graeme Russ
2011-11-11 5:04 ` Mike Frysinger
2011-11-11 5:16 ` Graeme Russ
2011-11-11 16:24 ` Mike Frysinger
2011-11-11 2:44 ` Mike Frysinger
2011-11-11 19:59 ` Scott Wood
2011-11-16 23:00 ` Graeme Russ
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