On 11/12/12 19:39, Matthew Gretton-Dann wrote:
On 10 December 2012 14:53, Zhangfei Gao <zhangfei....@linaro.org> wrote:
We met build error when using arm-linux-gnueabihf-gcc 3.7.3 for Huawei
s40v200 kernel, which is 3.0.8, log is below.
HAVE issue:
gcc-linaro-arm-linux-gnueabihf-4.7-2012.11-20121123_linux.tar.bz2
gcc-linaro-arm-linux-gnueabihf-4.7-2012.10-20121022_linux.tar.bz2
gcc-linaro-arm-linux-gnueabi-2012.03-20120326_linux.tar.bz2, with build flag
--with-float=softfp
NO issue:
arm-eabi-gcc 4.4.0, which comes from android package.
Any suggestion?
Thanks
make[1]: `include/generated/mach-types.h' is up to date.
CALL scripts/checksyscalls.sh
CHK include/generated/compile.h
AS arch/arm/mach-godbox/hi_pm_sleep.o
arch/arm/mach-godbox/hi_pm_sleep.S: Assembler messages:
arch/arm/mach-godbox/hi_pm_sleep.S:456: Error: selected processor does not
support requested special purpose register -- `mrs r10,FPEXC'
arch/arm/mach-godbox/hi_pm_sleep.S:456: Error: selected processor does not
support requested special purpose register -- `msr FPEXC,r2'
arch/arm/mach-godbox/hi_pm_sleep.S:456: Error: selected processor does not
support requested special purpose register -- `mrs r2,FPSCR'
arch/arm/mach-godbox/hi_pm_sleep.S:546: Error: selected processor does not
support requested special purpose register -- `msr FPEXC,r2'
arch/arm/mach-godbox/hi_pm_sleep.S:546: Error: selected processor does not
support requested special purpose register -- `msr FPSCR,r10'
arch/arm/mach-godbox/hi_pm_sleep.S:546: Error: selected processor does not
support requested special purpose register -- `msr FPEXC,r9'
make[1]: *** [arch/arm/mach-godbox/hi_pm_sleep.o] Error 1
make: *** [arch/arm/mach-godbox] Error 2
make: *** Waiting for unfinished jobs....
Can you show me the complete command line for assembling
arch/arm/mach-godbox/hi_pm_sleep.S into
arch/arm/mach-godbox/hi_pm_sleep.o please? And also the output of gcc
-v?
My guess is that you are building GCC yourself have specified
--with-float=softfp, but not specified the actual floating point
architecture with --with-fpu= on the GCC configure line. See the
documentation for -mfpu= in the GCC manuals to see what values are
valid here (again guessing but you probably want --with-fpu=vfpv3 or
--with-fpu=neon - but I don't know what architecture you are actually
compiling for).
Hmm, building the kernel with floating-point enabled is probably a
no-no! The kernel has to preserve the user-space floating point context
as it isn't saved on kernel entry. IIRC, insns in the kernel that
really must access the co-processors have to use generic instrucions
(MCR/MRC/LDC/STC, etc).
However, you might get a more useful answer if you talked to the kernel
folk.
R.
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