提交 bad50d79 编写于 作者: J James Hogan 提交者: Ralf Baechle

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: 7eb91118 ("MIPS: Add guest CP0 accessors")
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Reported-by: NGuenter 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: NRalf Baechle <ralf@linux-mips.org>
上级 fd716fca
......@@ -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
......
此差异已折叠。
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