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aarch32: Allow compiling with soft-float toolchain

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ARMv7 and Cortex-A32(ARMv8/aarch32) uses "arm-linux-gnueabi" toolchain which
has both soft-float and hard-float variants and so there could be scenarios
where soft-float toolchain is used.Even though TF-A documentation recommends
to use hard-float toolchain for aarch32 but there are external projects where
we cannot mandate the selection of toolchain and for those projects at least
the build should not fail.

Current TF-A source fails to build with soft-float toolchain because assembler
does not recognizes "vmsr" instruction which is required to enable floating
point unit.

To avoid this piece of code being compiled with soft-float toolchain add
predefined macro guard " __SOFTFP__" exposed by soft-float toolchain.

Change-Id: I76ba40906a8d622dcd476dd36ab4d277a925996c
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
This commit is contained in:
Manish Pandey 2019-04-01 15:27:18 +01:00
parent 8a08e27232
commit fbd8f6c841
1 changed files with 6 additions and 1 deletions
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7
include/arch/aarch32/el3_common_macros.S
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@ -92,9 +92,14 @@
*
* FPEXC.EN: Enable access to Advanced SIMD and floating point features
* from all exception levels.
*
* __SOFTFP__: Predefined macro exposed by soft-float toolchain.
* ARMv7 and Cortex-A32(ARMv8/aarch32) has both soft-float and
* hard-float variants of toolchain, avoid compiling below code with
* soft-float toolchain as "vmsr" instruction will not be recognized.
* ---------------------------------------------------------------------
*/
#if (ARM_ARCH_MAJOR > 7) || defined(ARMV7_SUPPORTS_VFP)
#if ((ARM_ARCH_MAJOR > 7) || defined(ARMV7_SUPPORTS_VFP)) && !(__SOFTFP__)
ldr r0, =(FPEXC_RESET_VAL | FPEXC_EN_BIT)
vmsr FPEXC, r0
isb