Commit bfc0a330 authored by Jiaxun Yang's avatar Jiaxun Yang Committed by Thomas Bogendoerfer
Browse files

MIPS: Fallback CPU -march flag to ISA level if unsupported 

LLVM does not implement some of -march options. However those options
are not mandatory for kernel to build for those CPUs.

Fallback -march CFLAG to ISA level if unsupported by toolchain so
we can get those kernel to build with LLVM.

Link: https://github.com/ClangBuiltLinux/linux/issues/1544


Reported-by: default avatarNathan Chancellor <nathan@kernel.org>
Signed-off-by: default avatarJiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
parent 1d59822a

arch/mips/Makefile

+17 −13
Original line number Diff line number Diff line
@@ -148,10 +148,10 @@ cflags-y += $(call cc-option,-Wa$(comma)-mno-fix-loongson3-llsc,) 
#

# CPU-dependent compiler/assembler options for optimization.

#

cflags-$(CONFIG_CPU_R3000)	+= -march=r3000

cflags-$(CONFIG_CPU_R4300)	+= -march=r4300 -Wa,--trap

cflags-$(CONFIG_CPU_R4X00)	+= -march=r4600 -Wa,--trap

cflags-$(CONFIG_CPU_TX49XX)	+= -march=r4600 -Wa,--trap

cflags-$(CONFIG_CPU_R3000)	+= $(call cc-option,-march=r3000,-march=mips1)

cflags-$(CONFIG_CPU_R4300)	+= $(call cc-option,-march=r4300,-march=mips3) -Wa,--trap

cflags-$(CONFIG_CPU_R4X00)	+= $(call cc-option,-march=r4600,-march=mips3) -Wa,--trap

cflags-$(CONFIG_CPU_TX49XX)	+= $(call cc-option,-march=r4600,-march=mips3) -Wa,--trap

cflags-$(CONFIG_CPU_MIPS32_R1)	+= -march=mips32 -Wa,--trap

cflags-$(CONFIG_CPU_MIPS32_R2)	+= -march=mips32r2 -Wa,--trap

cflags-$(CONFIG_CPU_MIPS32_R5)	+= -march=mips32r5 -Wa,--trap -modd-spreg
@@ -160,26 +160,30 @@ cflags-$(CONFIG_CPU_MIPS64_R1) += -march=mips64 -Wa,--trap 
cflags-$(CONFIG_CPU_MIPS64_R2)	+= -march=mips64r2 -Wa,--trap

cflags-$(CONFIG_CPU_MIPS64_R5)	+= -march=mips64r5 -Wa,--trap

cflags-$(CONFIG_CPU_MIPS64_R6)	+= -march=mips64r6 -Wa,--trap

cflags-$(CONFIG_CPU_P5600)	+= -march=p5600 -Wa,--trap -modd-spreg

cflags-$(CONFIG_CPU_R5000)	+= -march=r5000 -Wa,--trap

cflags-$(CONFIG_CPU_R5500)	+= $(call cc-option,-march=r5500,-march=r5000) \

cflags-$(CONFIG_CPU_P5600)	+= $(call cc-option,-march=p5600,-march=mips32r5) \

			-Wa,--trap -modd-spreg

cflags-$(CONFIG_CPU_R5000)	+= $(call cc-option,-march=r5000,-march=mips4) \

			-Wa,--trap

cflags-$(CONFIG_CPU_NEVADA)	+= $(call cc-option,-march=rm5200,-march=r5000) \

cflags-$(CONFIG_CPU_R5500)	+= $(call cc-option,-march=r5500,-march=mips4) \

			-Wa,--trap

cflags-$(CONFIG_CPU_RM7000)	+= $(call cc-option,-march=rm7000,-march=r5000) \

cflags-$(CONFIG_CPU_NEVADA)	+= $(call cc-option,-march=rm5200,-march=mips4) \

			-Wa,--trap

cflags-$(CONFIG_CPU_SB1)	+= $(call cc-option,-march=sb1,-march=r5000) \

cflags-$(CONFIG_CPU_RM7000)	+= $(call cc-option,-march=rm7000,-march=mips4) \

			-Wa,--trap

cflags-$(CONFIG_CPU_SB1)	+= $(call cc-option,-march=sb1,-march=mips64) \

			-Wa,--trap

cflags-$(CONFIG_CPU_SB1)	+= $(call cc-option,-mno-mdmx)

cflags-$(CONFIG_CPU_SB1)	+= $(call cc-option,-mno-mips3d)

cflags-$(CONFIG_CPU_R10000)	+= $(call cc-option,-march=r10000,-march=r8000) \

cflags-$(CONFIG_CPU_R10000)	+= $(call cc-option,-march=r10000,-march=mips4) \

			-Wa,--trap

cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += -march=octeon -Wa,--trap

cflags-$(CONFIG_CAVIUM_CN63XXP1) += -Wa,-mfix-cn63xxp1

cflags-$(CONFIG_CPU_BMIPS)	+= -march=mips32 -Wa,-mips32 -Wa,--trap



cflags-$(CONFIG_CPU_LOONGSON2E) += -march=loongson2e -Wa,--trap

cflags-$(CONFIG_CPU_LOONGSON2F) += -march=loongson2f -Wa,--trap

cflags-$(CONFIG_CPU_LOONGSON2E) += \

			$(call cc-option,-march=loongson2e,-march=mips3) -Wa,--trap

cflags-$(CONFIG_CPU_LOONGSON2F) += \

			$(call cc-option,-march=loongson2f,-march=mips3) -Wa,--trap

# Some -march= flags enable MMI instructions, and GCC complains about that

# support being enabled alongside -msoft-float. Thus explicitly disable MMI.

cflags-$(CONFIG_CPU_LOONGSON2EF) += $(call cc-option,-mno-loongson-mmi)