[PATCH v4 10/12] RISC-V: add rd reg parsing to insn.h header

[Heiko Stuebner]

From: Heiko Stuebner <heiko.stuebner at vrull.eu>

Add a macro to allow parsing of the rd register from an instruction.

Reviewed-by: Conor Dooley <conor.dooley at microchip.com>
Reviewed-by: Andrew Jones <ajones at ventanamicro.com>
Signed-off-by: Heiko Stuebner <heiko.stuebner at vrull.eu>
---
 arch/riscv/include/asm/insn.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/include/asm/insn.h b/arch/riscv/include/asm/insn.h
index 21ec817abec1..2a23890b4577 100644
--- a/arch/riscv/include/asm/insn.h
+++ b/arch/riscv/include/asm/insn.h
@@ -60,6 +60,7 @@
 #define RVG_RS1_OPOFF		15
 #define RVG_RS2_OPOFF		20
 #define RVG_RD_OPOFF		7
+#define RVG_RD_MASK		GENMASK(4, 0)
 
 /* The bit field of immediate value in RVC J instruction */
 #define RVC_J_IMM_SIGN_OPOFF	12
@@ -244,6 +245,10 @@ static __always_inline bool riscv_insn_is_branch(u32 code)
 #define RV_X(X, s, mask)  (((X) >> (s)) & (mask))
 #define RVC_X(X, s, mask) RV_X(X, s, mask)
 
+#define RV_EXTRACT_RD_REG(x) \
+	({typeof(x) x_ = (x); \
+	(RV_X(x_, RVG_RD_OPOFF, RVG_RD_MASK)); })
+
 #define RV_EXTRACT_UTYPE_IMM(x) \
 	({typeof(x) x_ = (x); \
 	(RV_X(x_, RV_U_IMM_31_12_OPOFF, RV_U_IMM_31_12_MASK)); })
-- 
2.35.1