diff options
Diffstat (limited to 'target/linux/patches/5.10.100/riscv.patch')
| -rw-r--r-- | target/linux/patches/5.10.100/riscv.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/target/linux/patches/5.10.100/riscv.patch b/target/linux/patches/5.10.100/riscv.patch new file mode 100644 index 000000000..cc9018d47 --- /dev/null +++ b/target/linux/patches/5.10.100/riscv.patch @@ -0,0 +1,52 @@ +From 6df2a016c0c8a3d0933ef33dd192ea6606b115e3 Mon Sep 17 00:00:00 2001 +From: Aurelien Jarno <aurelien@aurel32.net> +Date: Wed, 26 Jan 2022 18:14:42 +0100 +Subject: riscv: fix build with binutils 2.38 + +From version 2.38, binutils default to ISA spec version 20191213. This +means that the csr read/write (csrr*/csrw*) instructions and fence.i +instruction has separated from the `I` extension, become two standalone +extensions: Zicsr and Zifencei. As the kernel uses those instruction, +this causes the following build failure: + + CC arch/riscv/kernel/vdso/vgettimeofday.o + <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h: Assembler messages: + <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01' + <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01' + <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01' + <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01' + +The fix is to specify those extensions explicitely in -march. However as +older binutils version do not support this, we first need to detect +that. + +Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> +Tested-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> +Cc: stable@vger.kernel.org +Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> +--- + arch/riscv/Makefile | 6 ++++++ + 1 file changed, 6 insertions(+) + +(limited to 'arch/riscv') + +diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile +index 8a107ed18b0dc..7d81102cffd48 100644 +--- a/arch/riscv/Makefile ++++ b/arch/riscv/Makefile +@@ -50,6 +50,12 @@ riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima + riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima + riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd + riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c ++ ++# Newer binutils versions default to ISA spec version 20191213 which moves some ++# instructions from the I extension to the Zicsr and Zifencei extensions. ++toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei) ++riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei ++ + KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) + KBUILD_AFLAGS += -march=$(riscv-march-y) + +-- +cgit + |