From 8e4789d288e0155db1929b5672252429e52b36a8 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Wed, 22 Nov 2017 11:30:30 +0000 Subject: MIPS: XPA: Use XPA instructions in assembly Utilise XPA instructions MFHC0 & MTHC0 in inline assembly instead of directly encoding them with the _ASM_INSN* macros, and transparently implement these instructions as assembler macros if the toolchain doesn't support them natively, using the recently introduced assembler macro helpers. The old direct encodings were restricted to using the register $at, so this allows the extra register moves to go away (saving a grand total of 24 bytes). Signed-off-by: James Hogan Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/17775/ --- arch/mips/Makefile | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/mips/Makefile') diff --git a/arch/mips/Makefile b/arch/mips/Makefile index 0f20f84de53b8..d1ca839c3981e 100644 --- a/arch/mips/Makefile +++ b/arch/mips/Makefile @@ -216,6 +216,12 @@ cflags-$(toolchain-msa) += -DTOOLCHAIN_SUPPORTS_MSA endif toolchain-virt := $(call cc-option-yn,$(mips-cflags) -mvirt) cflags-$(toolchain-virt) += -DTOOLCHAIN_SUPPORTS_VIRT +# For -mmicromips, use -Wa,-fatal-warnings to catch unsupported -mxpa which +# only warns +xpa-cflags-y := $(mips-cflags) +xpa-cflags-$(micromips-ase) += -mmicromips -Wa$(comma)-fatal-warnings +toolchain-xpa := $(call cc-option-yn,$(xpa-cflags-y) -mxpa) +cflags-$(toolchain-xpa) += -DTOOLCHAIN_SUPPORTS_XPA # # Firmware support -- cgit v1.2.3