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domenico
2025-06-24 14:35:53 +02:00
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package/boot/uboot-sifiveu/patches/0009-riscv-Fix-build-against-binutils.patch Normal file
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@@ -0,0 +1,48 @@
commit 1dde977518f13824b847e23275001191139bc384
Author: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Date: Mon Oct 3 18:07:54 2022 +0200
riscv: Fix build against binutils 2.38
The following description is copied from the equivalent patch for the
Linux Kernel proposed by Aurelien Jarno:
>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:
arch/riscv/cpu/mtrap.S: Assembler messages:
arch/riscv/cpu/mtrap.S:65: Error: unrecognized opcode `csrr a0,scause'
arch/riscv/cpu/mtrap.S:66: Error: unrecognized opcode `csrr a1,sepc'
arch/riscv/cpu/mtrap.S:67: Error: unrecognized opcode `csrr a2,stval'
arch/riscv/cpu/mtrap.S:70: Error: unrecognized opcode `csrw sepc,a0'
Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Christian Stewart <christian@paral.in>
Reviewed-by: Rick Chen <rick@andestech.com>
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -24,7 +24,16 @@ ifeq ($(CONFIG_CMODEL_MEDANY),y)
CMODEL = medany
endif
-ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C) -mabi=$(ABI) \
+RISCV_MARCH = $(ARCH_BASE)$(ARCH_A)$(ARCH_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 := $(call cc-option-yn, -mabi=$(ABI) -march=$(RISCV_MARCH)_zicsr_zifencei)
+ifeq ($(toolchain-need-zicsr-zifencei),y)
+ RISCV_MARCH := $(RISCV_MARCH)_zicsr_zifencei
+endif
+
+ARCH_FLAGS = -march=$(RISCV_MARCH) -mabi=$(ABI) \
-mcmodel=$(CMODEL)
PLATFORM_CPPFLAGS += $(ARCH_FLAGS)