Hi Barry. I think the toolchain is operating correctly here. The
current version recognises a divide followed by a modulo and optimises
this into a call to the standard EABI function __aeabi__uldivmod().
Note the code:
do_div(Kpart, source);
K = Kpart & 0xFFFFFFFF;
/* Check if we need to round */
if ((K % 10) >= 5)
K += 5;
This function is provided by libgcc for normal applications. The
kernel provides it's own versions in arch/arm/lib/lib1funcs.s but is
missing __aeabi_uldivmod (note the 'l' for 64 bit).
-- Michael
On Tue, Apr 26, 2011 at 12:45 AM, Barry Song <21cn...@gmail.com> wrote:
> Hi All,
> I am using 2011.3 4.5 linaro GCC(armv7-a vfpv3d16) to compile kernel
> and modules. I select to compile all codecs as modules:
> "config SND_SOC_ALL_CODECS
> tristate "Build all ASoC CODEC drivers"
> "
> as M and I2C/SPI too.
>
> Then in the kernel dir, run "make" to get both vmlinux and modules, I
> found snd-soc-wm8974.ko, snd-soc-wm8940.ko and snd-soc-wm8510.ko will
> fail due to "__aeabi_uldivmod undefined".
>
> If i comment do_div() in these codec drivers, this issue will
> disappear. But it is strange there are many codecs which use do_div()
> too, for example:
> sound/soc/codecs/max98088.c
> sound/soc/codecs/max9850.c
> sound/soc/codecs/wm8350.c
> sound/soc/codecs/wm8400.c
> sound/soc/codecs/wm8510.c
> sound/soc/codecs/wm8580.c
> sound/soc/codecs/wm8753.c
> sound/soc/codecs/wm8804.c
> sound/soc/codecs/wm8900.c
> sound/soc/codecs/wm8904.c
> sound/soc/codecs/wm8940.c
> sound/soc/codecs/wm8955.c
> sound/soc/codecs/wm8960.c
> sound/soc/codecs/wm8974.c
> sound/soc/codecs/wm8978.c
> sound/soc/codecs/wm8985.c
> sound/soc/codecs/wm8990.c
> sound/soc/codecs/wm8991.c
> sound/soc/codecs/wm8993.c
> sound/soc/codecs/wm8994.c
> sound/soc/codecs/wm8995.c
> sound/soc/codecs/wm9081.c
>
> but others can pass the compiling except those 3 modules. Is it due to
> a wrong optimization by gcc?
>
> Other information:
> 1. old tool-chains we are using can pass the compiling of the 3 modules.
> 2. If i built all codecs into kernel image, these 3 drivers don't
> report error while compiling.
>
> Thanks
> Barry
>
> _______________________________________________
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> linaro-toolchain@lists.linaro.org
> http://lists.linaro.org/mailman/listinfo/linaro-toolchain
>
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