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authorJames Hogan <james.hogan@imgtec.com>2016-05-16 12:50:04 +0100
committerRalf Baechle <ralf@linux-mips.org>2016-05-17 11:06:04 +0200
commitbad50d79255a8a479ea63bea89e859bf08fd0f24 (patch)
tree2c4f05e03c679cfb72741634beb3b1d3d5fbdcd8 /arch/mips/Makefile
parentfd716fca10fc3dc0f18b8c16d4ecfa6d93f010d2 (diff)
downloadop-kernel-dev-bad50d79255a8a479ea63bea89e859bf08fd0f24.zip
op-kernel-dev-bad50d79255a8a479ea63bea89e859bf08fd0f24.tar.gz
MIPS: Fix VZ probe gas errors with binutils <2.24
The VZ guest register & TLB access macros introduced in commit "MIPS: Add guest CP0 accessors" use VZ ASE specific instructions that aren't understood by versions of binutils prior to 2.24. Add a check for whether the toolchain supports the -mvirt option, similar to the MSA toolchain check, and implement the accessors using .word if not. Due to difficulty in converting compiler specified registers (e.g. "$3") to usable numbers (e.g. "3") in inline asm, we need to copy to/from a temporary register, namely the assembler temporary (at/$1), and specify guest CP0 registers numerically in the gc0 macros. Fixes: 7eb91118227d ("MIPS: Add guest CP0 accessors") Signed-off-by: James Hogan <james.hogan@imgtec.com> Reported-by: Guenter Roeck <linux@roeck-us.net> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: linux-next@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13255/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Makefile')
-rw-r--r--arch/mips/Makefile2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index c0b002a..efd7a9d 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -200,6 +200,8 @@ ifeq ($(CONFIG_CPU_HAS_MSA),y)
toolchain-msa := $(call cc-option-yn,$(mips-cflags) -mhard-float -mfp64 -Wa$(comma)-mmsa)
cflags-$(toolchain-msa) += -DTOOLCHAIN_SUPPORTS_MSA
endif
+toolchain-virt := $(call cc-option-yn,$(mips-cflags) -mvirt)
+cflags-$(toolchain-virt) += -DTOOLCHAIN_SUPPORTS_VIRT
cflags-$(CONFIG_MIPS_COMPACT_BRANCHES_NEVER) += -mcompact-branches=never
cflags-$(CONFIG_MIPS_COMPACT_BRANCHES_OPTIMAL) += -mcompact-branches=optimal
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