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From: Aneesh V <aneesh@ti.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 2/4] arm: add %function attribute to assembly functions
Date: Mon, 20 Feb 2012 21:38:24 +0530	[thread overview]
Message-ID: <4F426FF8.3050307@ti.com> (raw)
In-Reply-To: <4F3FD679.9030509@aribaud.net>

On Saturday 18 February 2012 10:18 PM, Albert ARIBAUD wrote:
> Hi Aneesh,
>

[...]

>>> I will get back with more details on the Linaro GCC 2012.01 later.
>>
>> I meant "the Linaro GCC 2012.01 tool-chain problem"
>>
>> This is a different problem. Some of the .rodata symbols are given an
>> odd address although they should be aligned to at least 2-byte boundary
>> ). In fact the data is actually put at the even address but the symbol's
>> value is +1 of the actual address. This is the ARM convention for Thumb
>> functions, but they have applied it here for data too. That's the
>> problem. I see that this doesn't happen to all the .rodata in SPL.
>> Neither could I reproduce it with a small program. But the workaround
>> for this problem is to avoid -fdata-sections. The following patch works
>> around it.
>>
>> diff --git a/config.mk b/config.mk
>> index ddaa477..723286a 100644
>> --- a/config.mk
>> +++ b/config.mk
>> @@ -190,7 +190,7 @@ CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \
>>
>> # Enable garbage collection of un-used sections for SPL
>> ifeq ($(CONFIG_SPL_BUILD),y)
>> -CPPFLAGS += -ffunction-sections -fdata-sections
>> +CPPFLAGS += -ffunction-sections
>> LDFLAGS_FINAL += --gc-sections
>> endif
>>
>> Will you take a patch to make -fdata-sections optional, that is, having
>> it under something like CONFIG_SYS_SPL_NO_FDATA_SECTIONS?
>
> Hmm... considering you're seeing the issue in a fairly new toolchain
> release, I prefer notifying the toolchain makers, rather than removing
> the -fdata-sections from SPL even for specific boards. Can you go and
> see why the Linaro toolchain generated odd "thumb data" at all and get
> this fixed?

I tried investigating a bit. As I mentioned earlier it doesn't happen
with some other files that use the same compiler and linker commands.
So, I don't know what's going on. Also, I couldn't reproduce it with a
simple program unlike in the other cases. Anyway, I have notified
tool-chain folks at Linaro:

http://article.gmane.org/gmane.linux.linaro.toolchain/2096

br,
Aneesh

  reply	other threads:[~2012-02-20 16:08 UTC|newest]

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-06 11:37 [U-Boot] [RFC PATCH 0/4] Enable Thumb build for ARM platforms Aneesh V
2012-02-06 11:37 ` [U-Boot] [RFC PATCH 1/4] ARM: enable Thumb build Aneesh V
2012-02-06 18:45   ` Tom Rini
2012-02-07  7:43     ` Aneesh V
2012-02-06 11:37 ` [U-Boot] [RFC PATCH 2/4] OMAP3+: fix issues with " Aneesh V
2012-02-06 21:06   ` Albert ARIBAUD
2012-02-07  7:49     ` Aneesh V
2012-02-09  8:58     ` Aneesh V
2012-02-06 11:37 ` [U-Boot] [RFC PATCH 3/4] OMAP3+: Use -march=armv7-a and thereby enable Thumb-2 Aneesh V
2012-02-06 11:37 ` [U-Boot] [RFC PATCH 4/4] OMAP4: enable Thumb build Aneesh V
2012-02-06 12:26 ` [U-Boot] [RFC PATCH 0/4] Enable Thumb build for ARM platforms Aneesh V
2012-02-06 13:22   ` Aneesh V
2012-02-15 13:57 ` [U-Boot] [PATCH " Aneesh V
2012-02-15 13:57 ` [U-Boot] [PATCH 1/4] ARM: enable Thumb build Aneesh V
2012-02-15 13:57 ` [U-Boot] [PATCH 2/4] arm: add %function attribute to assembly functions Aneesh V
2012-02-17 11:09   ` Aneesh V
2012-02-18 10:13     ` Albert ARIBAUD
2012-02-18 13:24       ` Aneesh V
2012-02-18 15:04         ` Albert ARIBAUD
2012-02-18 16:34         ` Aneesh V
2012-02-18 16:48           ` Albert ARIBAUD
2012-02-20 16:08             ` Aneesh V [this message]
2012-02-23 11:06               ` Aneesh V
2012-02-17 17:13   ` Mike Frysinger
2012-02-18 11:12     ` Aneesh V
2012-02-18 11:34       ` Albert ARIBAUD
2012-02-18 22:03   ` Simon Glass
2012-02-19  7:15     ` Mike Frysinger
2012-02-20 20:07       ` Tom Rini
2012-02-20 21:53         ` Simon Glass
2012-02-21  4:19           ` Mike Frysinger
2012-02-21  4:44             ` Simon Glass
2012-02-21 14:33             ` Tom Rini
2012-02-21 15:42               ` Mike Frysinger
2012-02-21 18:03                 ` Aneesh V
2012-02-21 19:28                   ` Mike Frysinger
2012-02-21 20:01                     ` Aneesh V
2012-02-21  4:18         ` Mike Frysinger
2012-02-15 13:57 ` [U-Boot] [PATCH 3/4] armv7: Use -march=armv7-a and thereby enable Thumb-2 Aneesh V
2012-02-15 13:57 ` [U-Boot] [PATCH 4/4] OMAP4: enable Thumb build Aneesh V
2012-02-23 13:39 ` [U-Boot] [PATCH v2 1/5] arm: adapt asm/linkage.h from Linux Aneesh V
2012-02-23 14:01   ` Aneesh V
2012-02-23 13:39 ` [U-Boot] [PATCH v2 2/5] armv7: add appropriate headers for assembly functions Aneesh V
2012-02-23 13:39 ` [U-Boot] [PATCH v2 3/5] ARM: enable Thumb build Aneesh V
2012-02-23 14:57   ` Mike Frysinger
2012-02-23 17:28     ` Aneesh V
2012-02-23 17:34       ` Tom Rini
2012-02-23 17:49         ` Aneesh V
2012-02-23 17:51           ` Tom Rini
2012-02-23 18:09             ` Aneesh V
2012-02-23 18:13               ` Aneesh V
2012-02-23 18:05           ` Mike Frysinger
2012-02-23 18:04       ` Mike Frysinger
2012-02-23 18:12         ` Aneesh V
2012-02-23 13:39 ` [U-Boot] [PATCH v2 4/5] armv7: Use -march=armv7-a and thereby enable Thumb-2 Aneesh V
2012-02-23 13:39 ` [U-Boot] [PATCH v2 5/5] OMAP4: enable Thumb build Aneesh V
2012-02-23 14:06 ` [U-Boot] [PATCH v3 1/6] arm: adapt asm/linkage.h from Linux Aneesh V
2012-02-23 14:59   ` Mike Frysinger
2012-02-23 15:24     ` Tom Rini
2012-02-23 16:57       ` Mike Frysinger
2012-02-23 17:40     ` Aneesh V
2012-02-23 23:52       ` Mike Frysinger
2012-02-24 10:30         ` Aneesh V
2012-02-23 14:06 ` [U-Boot] [PATCH v3 2/6] armv7: add appropriate headers for assembly functions Aneesh V
2012-02-23 14:59   ` Mike Frysinger
2012-02-23 14:06 ` [U-Boot] [PATCH v3 3/6] ARM: enable Thumb build Aneesh V
2012-02-23 14:06 ` [U-Boot] [PATCH v3 4/6] armv7: Use -march=armv7-a and thereby enable Thumb-2 Aneesh V
2012-02-23 15:05   ` Mike Frysinger
2012-02-23 17:50     ` Aneesh V
2012-02-23 14:06 ` [U-Boot] [PATCH v3 5/6] omap4+: Avoid using __attribute__ ((__packed__)) Aneesh V
2012-02-23 14:21   ` Tom Rini
2012-02-23 14:56     ` Aneesh V
2012-02-23 15:03       ` Mike Frysinger
2012-02-23 15:03     ` Mike Frysinger
2012-02-23 15:42       ` Aneesh V
2012-02-23 14:06 ` [U-Boot] [PATCH v3 6/6] OMAP4: enable Thumb build Aneesh V
2012-03-08 17:10 ` [U-Boot] [PATCH 1/6] arm: adapt asm/linkage.h from Linux Aneesh V
2012-03-08 17:14   ` Aneesh V
2012-03-08 17:10 ` [U-Boot] [PATCH 2/6] armv7: add appropriate headers for assembly functions Aneesh V
2012-03-08 17:10 ` [U-Boot] [PATCH 3/6] ARM: enable Thumb build Aneesh V
2012-03-08 17:10 ` [U-Boot] [PATCH 4/6] armv7: Use -march=armv7-a and thereby enable Thumb-2 Aneesh V
2012-03-08 17:10 ` [U-Boot] [PATCH 5/6] omap4+: Avoid using __attribute__ ((__packed__)) Aneesh V
2012-03-08 17:10 ` [U-Boot] [PATCH 6/6] OMAP4: enable Thumb build Aneesh V

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