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e8be530233
This patch cleanup the MARCH string passing to both compiler and assembler. Note that the CFLAGS should not contain "fd" before we have mechnisms like kernel_fpu_begin/end in other architectures. Signed-off-by: Alan Kao <alankao@andestech.com> Cc: Greentime Hu <greentime@andestech.com> Cc: Vincent Chen <vincentc@andestech.com> Cc: Zong Li <zong@andestech.com> Cc: Nick Hu <nickhu@andestech.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
83 lines
2.3 KiB
Makefile
83 lines
2.3 KiB
Makefile
# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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OBJCOPYFLAGS := -O binary
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LDFLAGS_vmlinux :=
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ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
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LDFLAGS_vmlinux := --no-relax
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endif
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KBUILD_AFLAGS_MODULE += -fPIC
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KBUILD_CFLAGS_MODULE += -fPIC
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KBUILD_DEFCONFIG = defconfig
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export BITS
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ifeq ($(CONFIG_ARCH_RV64I),y)
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BITS := 64
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UTS_MACHINE := riscv64
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KBUILD_CFLAGS += -mabi=lp64
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KBUILD_AFLAGS += -mabi=lp64
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KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128)
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KBUILD_LDFLAGS += -melf64lriscv
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else
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BITS := 32
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UTS_MACHINE := riscv32
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KBUILD_CFLAGS += -mabi=ilp32
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KBUILD_AFLAGS += -mabi=ilp32
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KBUILD_LDFLAGS += -melf32lriscv
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endif
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KBUILD_CFLAGS += -Wall
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# ISA string setting
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riscv-march-$(CONFIG_ARCH_RV32I) := rv32im
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riscv-march-$(CONFIG_ARCH_RV64I) := rv64im
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riscv-march-$(CONFIG_RISCV_ISA_A) := $(riscv-march-y)a
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riscv-march-y := $(riscv-march-y)fd
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riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
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KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
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KBUILD_AFLAGS += -march=$(riscv-march-y)
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KBUILD_CFLAGS += -mno-save-restore
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KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
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ifeq ($(CONFIG_CMODEL_MEDLOW),y)
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KBUILD_CFLAGS += -mcmodel=medlow
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endif
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ifeq ($(CONFIG_CMODEL_MEDANY),y)
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KBUILD_CFLAGS += -mcmodel=medany
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endif
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ifeq ($(CONFIG_MODULE_SECTIONS),y)
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KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/riscv/kernel/module.lds
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endif
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KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
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# GCC versions that support the "-mstrict-align" option default to allowing
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# unaligned accesses. While unaligned accesses are explicitly allowed in the
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# RISC-V ISA, they're emulated by machine mode traps on all extant
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# architectures. It's faster to have GCC emit only aligned accesses.
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KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
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# arch specific predefines for sparse
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CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
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head-y := arch/riscv/kernel/head.o
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core-y += arch/riscv/kernel/ arch/riscv/mm/
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libs-y += arch/riscv/lib/
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all: vmlinux
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