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

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>

diff --git a/arch/Config.in.riscv b/arch/Config.in.riscv
index bdd2672602a338142ad75816df279961e0e27039..1fc20e5de745caa07bd09f9eb6101988a3789ca2 100644 (file)
--- a/arch/Config.in.riscv
+++ b/arch/Config.in.riscv
@@ -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"