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cmake: gcc: target_arm: Force FP hard ABI for DCLS

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When Dual-redundant Core Lock-step (DCLS) topology is used, the VFP
registers across the two redundant cores must be manually initialised
and synchronised, and this requires the `-mfloat-abi=hard` option to
be specified.

This commit forces the use of FP "hard" ABI on the VFP-equipped cores
that are configured in DCLS topology.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2020-03-31 10:06:32 +09:00
commit 18398948db
1 changed files with 11 additions and 4 deletions
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15
cmake/compiler/gcc/target_arm.cmake
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@ -14,12 +14,19 @@ if(CONFIG_FPU)
list(APPEND TOOLCHAIN_C_FLAGS -mfpu=${GCC_M_FPU})
list(APPEND TOOLCHAIN_LD_FLAGS -mfpu=${GCC_M_FPU})
if (CONFIG_FP_SOFTABI)
list(APPEND TOOLCHAIN_C_FLAGS -mfloat-abi=softfp)
list(APPEND TOOLCHAIN_LD_FLAGS -mfloat-abi=softfp)
elseif(CONFIG_FP_HARDABI)
if(CONFIG_CPU_HAS_DCLS AND NOT CONFIG_FP_HARDABI)
# If the processor is equipped with VFP and configured in DCLS topology,
# the FP "hard" ABI must be used in order to facilitate the FP register
# initialisation and synchronisation.
set(FORCE_FP_HARDABI TRUE)
endif()
if (CONFIG_FP_HARDABI OR FORCE_FP_HARDABI)
list(APPEND TOOLCHAIN_C_FLAGS -mfloat-abi=hard)
list(APPEND TOOLCHAIN_LD_FLAGS -mfloat-abi=hard)
elseif(CONFIG_FP_SOFTABI)
list(APPEND TOOLCHAIN_C_FLAGS -mfloat-abi=softfp)
list(APPEND TOOLCHAIN_LD_FLAGS -mfloat-abi=softfp)
endif()
endif()