Both riscv64 and riscv32 have:
* the same ARCH value, it is riscv
* the same arch/riscv source code tree
The only differences are:
* riscv64 uses defconfig, riscv32 uses rv32_defconfig
* riscv64 uses qemu-system-riscv64, riscv32 uses qemu-system-riscv32
* riscv32 has different compiler options (-march= and -mabi=)
So, riscv32 can share most of the settings with riscv64, there is no
need to add it as a whole new architecture but just need a flag to
record and reflect the difference.
The 32bit mips and loongarch may be able to use the same method, so,
let's use a meaningful flag: CONFIG_32BIT. If required in the future,
this flag can also be automatically loaded from
include/config/auto.conf.
With this patch, it is able to run nolibc test for rv32 like this:
$ make run ARCH=riscv32 CROSS_COMPILE=riscv64-linux-gnu- ...
Signed-off-by: Zhangjin Wu <falcon@xxxxxxxxxxx>
---
tools/testing/selftests/nolibc/Makefile | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 44088535682e..ea434a0acdc1 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -14,6 +14,12 @@ include $(srctree)/scripts/subarch.include
ARCH = $(SUBARCH)
endif
+# Allow pass ARCH=riscv|riscv32|riscv64, riscv implies riscv64
+ifneq ($(findstring xriscv,x$(ARCH)),)
+ CONFIG_32BIT := $(if $(findstring 32x,$(ARCH)x),1)
+ override ARCH := riscv
+endif
+
# kernel image names by architecture
IMAGE_i386 = arch/x86/boot/bzImage
IMAGE_x86_64 = arch/x86/boot/bzImage
@@ -34,7 +40,7 @@ DEFCONFIG_x86 = defconfig
DEFCONFIG_arm64 = defconfig
DEFCONFIG_arm = multi_v7_defconfig
DEFCONFIG_mips = malta_defconfig
-DEFCONFIG_riscv = defconfig
+DEFCONFIG_riscv = $(if $(CONFIG_32BIT),rv32_defconfig,defconfig)
DEFCONFIG_s390 = defconfig
DEFCONFIG_loongarch = defconfig
DEFCONFIG = $(DEFCONFIG_$(ARCH))
@@ -49,7 +55,7 @@ QEMU_ARCH_x86 = x86_64
QEMU_ARCH_arm64 = aarch64
QEMU_ARCH_arm = arm
QEMU_ARCH_mips = mipsel # works with malta_defconfig
-QEMU_ARCH_riscv = riscv64
+QEMU_ARCH_riscv = $(if $(CONFIG_32BIT),riscv32,riscv64)
QEMU_ARCH_s390 = s390x
QEMU_ARCH_loongarch = loongarch64
QEMU_ARCH = $(QEMU_ARCH_$(ARCH))
@@ -76,6 +82,7 @@ else
Q=@
endif
+CFLAGS_riscv = $(if $(CONFIG_32BIT),-march=rv32i -mabi=ilp32)
CFLAGS_s390 = -m64
CFLAGS_STACKPROTECTOR ?= $(call cc-option,-mstack-protector-guard=global $(call cc-option,-fstack-protector-all))
CFLAGS ?= -Os -fno-ident -fno-asynchronous-unwind-tables -std=c89 \
--
2.25.1
