Unverified Commit 3478ba99 authored Nov 22, 2017 by James Hogan

MIPS: XPA: Allow use of $0 (zero) to MTHC0

Tweak __writex_32bit_c0_register() to allow the compiler to use $0 (the
zero register) as an input to the mthc0 instruction.

Signed-off-by: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17774/

parent 8e4789d2

arch/mips/include/asm/mipsregs.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -1537,10 +1537,10 @@ do { \
		" .set push \n" \
		" .set mips32r2 \n" \
		_ASM_SET_XPA \
		" mthc0 %0, $%1 \n" \
		" mthc0 %z0, $%1 \n" \
		" .set pop \n" \
		: \
		: "r" (value), "i" (register)); \
		: "Jr" (value), "i" (register)); \
		} while (0)

		#define read_c0_index() __read_32bit_c0_register($0, 0)