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arch/riscv: set the default float ABI based on ISA extensions

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This patch sets the default floating point ABI based on the ISA
extensions that have been selected rather than defaulting to soft
float.

For 64-bit:

ISA 'D' selects  lp64d
ISA 'F' selects  lp64f
Otherwise select lp64

For 32-bit:

ISA 'D' selects  ilp32d
ISA 'F' selects  ilp32f
Otherwise select ilp32

This change was proposed by Palmer Dabbelt at SiFive.

Signed-off-by: Mark Corbin <mark.corbin@embecosm.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Mark Corbin 2019-09-19 16:40:35 +01:00 committed by Thomas Petazzoni
parent 916497d7d5
commit aee39cbf27
1 changed files with 6 additions and 2 deletions
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8
arch/Config.in.riscv
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@ -80,8 +80,12 @@ endchoice
choice
prompt "Target ABI"
default BR2_RISCV_ABI_ILP32 if !BR2_ARCH_IS_64
default BR2_RISCV_ABI_LP64 if BR2_ARCH_IS_64
default BR2_RISCV_ABI_ILP32D if !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
default BR2_RISCV_ABI_ILP32F if !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
default BR2_RISCV_ABI_ILP32 if !BR2_ARCH_IS_64
default BR2_RISCV_ABI_LP64D if BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
default BR2_RISCV_ABI_LP64F if BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
default BR2_RISCV_ABI_LP64 if BR2_ARCH_IS_64
config BR2_RISCV_ABI_ILP32
bool "ilp32"