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riscv: support building double-float modules

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The riscv32 toolchain for GCC-12 provided by kernel.org contains libgcc.a
compiled for double-float. To link to it we have to adjust how we build
U-Boot.

As U-Boot actually does not use floating point at all this should not
make a significant difference for the produced binaries.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
This commit is contained in:
Heinrich Schuchardt 2022-10-12 14:59:51 +02:00 committed by Leo Yu-Chi Liang
parent f22db44c1b
commit e67f34f778
2 changed files with 27 additions and 3 deletions
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15
arch/riscv/Kconfig
View File

@ -152,6 +152,21 @@ config RISCV_ISA_C
when building U-Boot, which results in compressed instructions in the
U-Boot binary.
config RISCV_ISA_F
bool "Standard extension for Single-Precision Floating Point"
default y
help
Adds "F" to the ISA string passed to the compiler.
config RISCV_ISA_D
bool "Standard extension for Double-Precision Floating Point"
depends on RISCV_ISA_F
default y
help
Adds "D" to the ISA string passed to the compiler and changes the
riscv32 ABI from ilp32 to ilp32d and the riscv64 ABI from lp64 to
lp64d.
config RISCV_ISA_A
def_bool y

15
arch/riscv/Makefile
View File

@ -5,15 +5,22 @@
ifeq ($(CONFIG_ARCH_RV64I),y)
ARCH_BASE = rv64im
ABI = lp64
ABI_BASE = lp64
endif
ifeq ($(CONFIG_ARCH_RV32I),y)
ARCH_BASE = rv32im
ABI = ilp32
ABI_BASE = ilp32
endif
ifeq ($(CONFIG_RISCV_ISA_A),y)
ARCH_A = a
endif
ifeq ($(CONFIG_RISCV_ISA_F),y)
ARCH_F = f
endif
ifeq ($(CONFIG_RISCV_ISA_D),y)
ARCH_D = d
ABI_D = d
endif
ifeq ($(CONFIG_RISCV_ISA_C),y)
ARCH_C = c
endif
@ -24,7 +31,9 @@ ifeq ($(CONFIG_CMODEL_MEDANY),y)
CMODEL = medany
endif
RISCV_MARCH = $(ARCH_BASE)$(ARCH_A)$(ARCH_C)
RISCV_MARCH = $(ARCH_BASE)$(ARCH_A)$(ARCH_F)$(ARCH_D)$(ARCH_C)
ABI = $(ABI_BASE)$(ABI_D)
# Newer binutils versions default to ISA spec version 20191213 which moves some
# instructions from the I extension to the Zicsr and Zifencei extensions.