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| author | James Hogan <james.hogan@imgtec.com> | 2016-05-16 13:50:04 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-05-17 11:06:04 +0200 |
| commit | bad50d79255a8a479ea63bea89e859bf08fd0f24 (patch) | |
| tree | 2c4f05e03c679cfb72741634beb3b1d3d5fbdcd8 /arch/mips/Makefile | |
| parent | MIPS: perf: Fix I6400 event numbers (diff) | |
| download | linux-bad50d79255a8a479ea63bea89e859bf08fd0f24.tar.xz linux-bad50d79255a8a479ea63bea89e859bf08fd0f24.zip | |
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/$1), and specify
guest CP0 registers numerically in the gc0 macros.
Fixes: 7eb91118227d ("MIPS: Add guest CP0 accessors")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-next@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13255/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Makefile')
| -rw-r--r-- | arch/mips/Makefile | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile index c0b002a09bef..efd7a9dc93c4 100644 --- a/arch/mips/Makefile +++ b/arch/mips/Makefile @@ -200,6 +200,8 @@ ifeq ($(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 |