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riscv: set -march and -mabi based on the Kconfig configuration

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Use the new Kconfig entries to construct the ISA string for the -march
compiler flag. The -mabi compiler flag is selected based on the base
integer instruction set.

With this change, the C (compressed instructions) ISA extension is now
enabled for all boards with CONFIG_RISCV_ISA_C set. Buildman reports a
decrease in binary size of 71590 bytes.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Lukas Auer 2018-11-22 11:26:15 +01:00 committed by Andes
parent d57ffa650f
commit 0c074845e5
2 changed files with 20 additions and 4 deletions
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20
arch/riscv/Makefile
View file

@ -3,6 +3,26 @@
# Copyright (C) 2017 Andes Technology Corporation.
# Rick Chen, Andes Technology Corporation <rick@andestech.com>
ifeq ($(CONFIG_ARCH_RV64I),y)
ARCH_BASE = rv64im
ABI = lp64
endif
ifeq ($(CONFIG_ARCH_RV32I),y)
ARCH_BASE = rv32im
ABI = ilp32
endif
ifeq ($(CONFIG_RISCV_ISA_A),y)
ARCH_A = a
endif
ifeq ($(CONFIG_RISCV_ISA_C),y)
ARCH_C = c
endif
ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C) -mabi=$(ABI)
PLATFORM_CPPFLAGS += $(ARCH_FLAGS)
CFLAGS_EFI += $(ARCH_FLAGS)
head-y := arch/riscv/cpu/start.o
libs-y += arch/riscv/cpu/

4
arch/riscv/config.mk
View file

@ -14,16 +14,12 @@
64bit-emul := elf64lriscv
ifdef CONFIG_32BIT
PLATFORM_CPPFLAGS += -march=rv32ima -mabi=ilp32
PLATFORM_LDFLAGS += -m $(32bit-emul)
CFLAGS_EFI += -march=rv32ima -mabi=ilp32
EFI_LDS := elf_riscv32_efi.lds
endif
ifdef CONFIG_64BIT
PLATFORM_CPPFLAGS += -march=rv64ima -mabi=lp64
PLATFORM_LDFLAGS += -m $(64bit-emul)
CFLAGS_EFI += -march=rv64ima -mabi=lp64
EFI_LDS := elf_riscv64_efi.lds
endif