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arch: add support for RISC-V 64-bit (riscv64) architecture

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This enables a riscv64 system to be built with a Buildroot generated
toolchain (gcc >= 7.x, binutils >= 2.30, glibc only).

This configuration has been used to successfully build a qemu-bootable
riscv-linux-4.15 kernel (https://github.com/riscv/riscv-linux.git).

Signed-off-by: Mark Corbin <mark.corbin@embecosm.com>
[Thomas:
 - simplify arch.mk.riscv by directly setting GCC_TARGET_ARCH
 - simplify glibc.mk changes by using GLIBC_CONF_ENV.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Mark Corbin 2018-09-12 11:22:54 +01:00 committed by Thomas Petazzoni
parent 03e2bad868
commit 9b3d52b400
9 changed files with 167 additions and 2 deletions

4
DEVELOPERS
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@ -1298,6 +1298,10 @@ F: package/lynx/
N: Mario Rugiero <mrugiero@gmail.com>
F: package/ratpoison/
N: Mark Corbin <mark.corbin@embecosm.com>
F: arch/arch.mk.riscv
F: arch/Config.in.riscv
N: Markos Chandras <markos.chandras@imgtec.com>
F: package/harfbuzz/
F: package/libsecret/

1
Makefile
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@ -433,6 +433,7 @@ KERNEL_ARCH := $(shell echo "$(ARCH)" | sed -e "s/-.*//" \
-e s/parisc64/parisc/ \
-e s/powerpc64.*/powerpc/ \
-e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
-e s/riscv.*/riscv/ \
-e s/sh.*/sh/ \
-e s/microblazeel/microblaze/)

15
arch/Config.in
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@ -198,6 +198,17 @@ config BR2_powerpc64le
http://www.power.org/
http://en.wikipedia.org/wiki/Powerpc
config BR2_riscv
bool "RISCV"
select BR2_ARCH_HAS_MMU_MANDATORY
select BR2_ARCH_NEEDS_GCC_AT_LEAST_7
help
RISC-V is an open, free Instruction Set Architecture created
by the UC Berkeley Architecture Research group and supported
and promoted by RISC-V Foundation.
https://riscv.org/
https://en.wikipedia.org/wiki/RISC-V
config BR2_sh
bool "SuperH"
select BR2_ARCH_HAS_MMU_OPTIONAL
@ -423,6 +434,10 @@ if BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le
source "arch/Config.in.powerpc"
endif
if BR2_riscv
source "arch/Config.in.riscv"
endif
if BR2_sh
source "arch/Config.in.sh"
endif

102
arch/Config.in.riscv Normal file
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@ -0,0 +1,102 @@
# RISC-V CPU ISA extensions.
config BR2_RISCV_ISA_RVI
bool
config BR2_RISCV_ISA_RVM
bool
config BR2_RISCV_ISA_RVA
bool
config BR2_RISCV_ISA_RVF
bool
config BR2_RISCV_ISA_RVD
bool
config BR2_RISCV_ISA_RVC
bool
choice
prompt "Target Architecture Variant"
default BR2_riscv_g
config BR2_riscv_g
bool "General purpose (G)"
select BR2_RISCV_ISA_RVI
select BR2_RISCV_ISA_RVM
select BR2_RISCV_ISA_RVA
select BR2_RISCV_ISA_RVF
select BR2_RISCV_ISA_RVD
help
General purpose (G) is equivalent to IMAFD.
config BR2_riscv_custom
bool "Custom architecture"
select BR2_RISCV_ISA_RVI
select BR2_RISCV_ISA_CUSTOM_RVA
endchoice
if BR2_riscv_custom
comment "Instruction Set Extensions"
config BR2_RISCV_ISA_CUSTOM_RVM
bool "Integer Multiplication and Division (M)"
select BR2_RISCV_ISA_RVM
config BR2_RISCV_ISA_CUSTOM_RVA
bool "Atomic Instructions (A)"
select BR2_RISCV_ISA_RVA
config BR2_RISCV_ISA_CUSTOM_RVF
bool "Single-precision Floating-point (F)"
select BR2_RISCV_ISA_RVF
config BR2_RISCV_ISA_CUSTOM_RVD
bool "Double-precision Floating-point (D)"
depends on BR2_RISCV_ISA_RVF
select BR2_RISCV_ISA_RVD
config BR2_RISCV_ISA_CUSTOM_RVC
bool "Compressed Instructions (C)"
select BR2_RISCV_ISA_RVC
endif
config BR2_RISCV_64
bool
default y
select BR2_ARCH_IS_64
choice
prompt "Target ABI"
default BR2_RISCV_ABI_LP64
config BR2_RISCV_ABI_LP64
bool "lp64"
depends on BR2_ARCH_IS_64
config BR2_RISCV_ABI_LP64F
bool "lp64f"
depends on BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
config BR2_RISCV_ABI_LP64D
bool "lp64d"
depends on BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
endchoice
config BR2_ARCH
default "riscv64" if BR2_ARCH_IS_64
config BR2_ENDIAN
default "LITTLE"
config BR2_GCC_TARGET_ABI
default "lp64" if BR2_RISCV_ABI_LP64
default "lp64f" if BR2_RISCV_ABI_LP64F
default "lp64d" if BR2_RISCV_ABI_LP64D
config BR2_READELF_ARCH_NAME
default "RISC-V"

28
arch/arch.mk.riscv Normal file
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@ -0,0 +1,28 @@
#
# Configure the GCC_TARGET_ARCH variable and append the
# appropriate RISC-V ISA extensions.
#
ifeq ($(BR2_riscv),y)
ifeq ($(BR2_ARCH_IS_64),y)
GCC_TARGET_ARCH := rv64i
endif
ifeq ($(BR2_RISCV_ISA_RVM),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)m
endif
ifeq ($(BR2_RISCV_ISA_RVA),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)a
endif
ifeq ($(BR2_RISCV_ISA_RVF),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)f
endif
ifeq ($(BR2_RISCV_ISA_RVD),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)d
endif
ifeq ($(BR2_RISCV_ISA_RVC),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)c
endif
endif

2
package/binutils/Config.in.host
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@ -12,9 +12,11 @@ choice
config BR2_BINUTILS_VERSION_2_28_X
bool "binutils 2.28.1"
depends on !BR2_arc
depends on !BR2_riscv
config BR2_BINUTILS_VERSION_2_29_X
bool "binutils 2.29.1"
depends on !BR2_riscv
config BR2_BINUTILS_VERSION_2_30_X
bool "binutils 2.30"

6
package/glibc/glibc.mk
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@ -76,6 +76,12 @@ GLIBC_CONF_ENV = \
libc_cv_forced_unwind=yes \
libc_cv_ssp=no
# Override the default library locations of /lib64/<abi> and
# /usr/lib64/<abi>/ for RISC-V.
ifeq ($(BR2_riscv),y)
GLIBC_CONF_ENV += libc_cv_slibdir=/lib64 libc_cv_rtlddir=/lib
endif
# Even though we use the autotools-package infrastructure, we have to
# override the default configure commands for several reasons:
#

5
package/linux-headers/Config.in.host
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@ -29,22 +29,27 @@ config BR2_KERNEL_HEADERS_AS_KERNEL
config BR2_KERNEL_HEADERS_3_2
bool "Linux 3.2.x kernel headers"
depends on !BR2_aarch64 && !BR2_arc && !BR2_nios2
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
config BR2_KERNEL_HEADERS_4_1
bool "Linux 4.1.x kernel headers"
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
config BR2_KERNEL_HEADERS_4_4
bool "Linux 4.4.x kernel headers"
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
config BR2_KERNEL_HEADERS_4_9
bool "Linux 4.9.x kernel headers"
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
config BR2_KERNEL_HEADERS_4_14
bool "Linux 4.14.x kernel headers"
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
config BR2_KERNEL_HEADERS_4_16

6
toolchain/toolchain-buildroot/Config.in
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@ -46,14 +46,16 @@ config BR2_TOOLCHAIN_BUILDROOT_GLIBC
BR2_aarch64_be || BR2_i386 || BR2_mips || \
BR2_mipsel || BR2_mips64 || BR2_mips64el|| \
BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le || \
BR2_sh || BR2_sparc64 || BR2_x86_64 || \
BR2_microblaze || BR2_nios2 || BR2_archs38
BR2_riscv || BR2_sh || BR2_sparc64 || \
BR2_x86_64 || BR2_microblaze || BR2_nios2 || \
BR2_archs38
depends on BR2_USE_MMU
depends on !BR2_STATIC_LIBS
depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10 || !BR2_powerpc64le
depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5 || !BR2_MIPS_NAN_2008
depends on !BR2_powerpc_SPE
depends on BR2_RISCV_ISA_RVA || !BR2_riscv
select BR2_TOOLCHAIN_USES_GLIBC
# our glibc.mk enables RPC support
select BR2_TOOLCHAIN_HAS_NATIVE_RPC