From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: linux-mips@vger.kernel.org
Cc: llvm@lists.linux.dev, tsbogend@alpha.franken.de,
ndesaulniers@google.com, nathan@kernel.org,
Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: [PATCH 5/5] MIPS: Fallback CPU -march CFLAG to ISA level if unsupported
Date: Fri, 7 Apr 2023 11:27:21 +0100 [thread overview]
Message-ID: <20230407102721.14814-6-jiaxun.yang@flygoat.com> (raw)
In-Reply-To: <20230407102721.14814-1-jiaxun.yang@flygoat.com>
LLVM does not implement some of -march option. However those march
does not provide any special functionality in most cases, they just
serves as compiler's tuning target.
Fallback -march CFLAG to ISA level if unsupported by toolchain so
we can get those kernel to build with LLVM.
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
arch/mips/Makefile | 30 +++++++++++++++++-------------
1 file changed, 17 insertions(+), 13 deletions(-)
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 344fe5f00f7b..eab6abeaa45c 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -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
@@ -160,19 +160,21 @@ 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) += $(call cc-option,-march=sb1,-march=mips4) \
-Wa,--trap
cflags-$(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) += $(call cc-option,-march=octeon) -Wa,--trap
ifeq (,$(findstring march=octeon, $(cflags-$(CONFIG_CPU_CAVIUM_OCTEON))))
@@ -181,8 +183,10 @@ endif
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)
--
2.39.2 (Apple Git-143)
next prev parent reply other threads:[~2023-04-07 10:27 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-07 10:27 [PATCH 0/5] MIPS: LLVM toolchain support for more CPUs Jiaxun Yang
2023-04-07 10:27 ` [PATCH 1/5] MIPS: Move various toolchain ASE check to Kconfig Jiaxun Yang
2023-04-07 18:57 ` Nathan Chancellor
2023-04-07 22:51 ` Jiaxun Yang
2023-04-07 10:27 ` [PATCH 2/5] MIPS: Add toolchain feature dependency for microMIPS smartMIPS Jiaxun Yang
2023-04-07 22:08 ` Nick Desaulniers
2023-04-07 10:27 ` [PATCH 3/5] MIPS: Detect toolchain support of workarounds in Kconfig Jiaxun Yang
2023-04-07 22:15 ` Nick Desaulniers
2023-04-07 10:27 ` [PATCH 4/5] MIPS: Detect toolchain support of o32 ABI with 64 bit CPU Jiaxun Yang
2023-04-07 22:19 ` Nick Desaulniers
2023-04-07 22:21 ` Nick Desaulniers
2023-04-07 22:26 ` Jiaxun Yang
2023-04-07 10:27 ` Jiaxun Yang [this message]
2023-04-07 22:23 ` [PATCH 5/5] MIPS: Fallback CPU -march CFLAG to ISA level if unsupported Nick Desaulniers
2023-04-08 9:47 ` Jiaxun Yang
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