RISC-V: move some stray __RISCV_INSN_FUNCS definitions from kprobes

The __RISCV_INSN_FUNCS originally declared riscv_insn_is_* functions inside
the kprobes implementation. This got moved into a central header in
commit ec5f9087 ("RISC-V: Move riscv_insn_is_* macros into a common header").

Though it looks like I overlooked two of them, so fix that. FENCE itself is
an instruction defined directly by its own opcode, while the created
riscv_isn_is_system function covers all instructions defined under the SYSTEM
opcode.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Link: https://lore.kernel.org/r/20230113211955.3534431-1-heiko@sntech.deSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/include/asm/insn.h

@@ -128,6 +128,7 @@
 #define RVC_C2_RD_OPOFF		7
 
 /* parts of opcode for RVG*/
+#define RVG_OPCODE_FENCE	0x0f
 #define RVG_OPCODE_AUIPC	0x17
 #define RVG_OPCODE_BRANCH	0x63
 #define RVG_OPCODE_JALR		0x67
@@ -163,6 +164,7 @@
 #define RVG_MATCH_AUIPC		(RVG_OPCODE_AUIPC)
 #define RVG_MATCH_JALR		(RV_ENCODE_FUNCT3(JALR) | RVG_OPCODE_JALR)
 #define RVG_MATCH_JAL		(RVG_OPCODE_JAL)
+#define RVG_MATCH_FENCE		(RVG_OPCODE_FENCE)
 #define RVG_MATCH_BEQ		(RV_ENCODE_FUNCT3(BEQ) | RVG_OPCODE_BRANCH)
 #define RVG_MATCH_BNE		(RV_ENCODE_FUNCT3(BNE) | RVG_OPCODE_BRANCH)
 #define RVG_MATCH_BLT		(RV_ENCODE_FUNCT3(BLT) | RVG_OPCODE_BRANCH)
@@ -182,6 +184,7 @@
 #define RVG_MASK_AUIPC		(RV_INSN_OPCODE_MASK)
 #define RVG_MASK_JALR		(RV_INSN_FUNCT3_MASK | RV_INSN_OPCODE_MASK)
 #define RVG_MASK_JAL		(RV_INSN_OPCODE_MASK)
+#define RVG_MASK_FENCE		(RV_INSN_OPCODE_MASK)
 #define RVC_MASK_C_JALR		(RVC_INSN_FUNCT4_MASK | RVC_INSN_J_RS2_MASK | RVC_INSN_OPCODE_MASK)
 #define RVC_MASK_C_JR		(RVC_INSN_FUNCT4_MASK | RVC_INSN_J_RS2_MASK | RVC_INSN_OPCODE_MASK)
 #define RVC_MASK_C_JAL		(RVC_INSN_FUNCT3_MASK | RVC_INSN_OPCODE_MASK)
@@ -233,6 +236,13 @@ __RISCV_INSN_FUNCS(c_bnez, RVC_MASK_C_BNEZ, RVC_MATCH_C_BNEZ)
 __RISCV_INSN_FUNCS(c_ebreak, RVC_MASK_C_EBREAK, RVC_MATCH_C_EBREAK)
 __RISCV_INSN_FUNCS(ebreak, RVG_MASK_EBREAK, RVG_MATCH_EBREAK)
 __RISCV_INSN_FUNCS(sret, RVG_MASK_SRET, RVG_MATCH_SRET)
+__RISCV_INSN_FUNCS(fence, RVG_MASK_FENCE, RVG_MATCH_FENCE);
+
+/* special case to catch _any_ system instruction */
+static __always_inline bool riscv_insn_is_system(u32 code)
+{
+	return (code & RV_INSN_OPCODE_MASK) == RVG_OPCODE_SYSTEM;
+}
 
 /* special case to catch _any_ branch instruction */
 static __always_inline bool riscv_insn_is_branch(u32 code)

arch/riscv/kernel/probes/simulate-insn.h

@@ -12,9 +12,6 @@
 		}							\
 	} while (0)
 
-__RISCV_INSN_FUNCS(system,	0x7f, 0x73);
-__RISCV_INSN_FUNCS(fence,	0x7f, 0x0f);
-
 #define RISCV_INSN_SET_SIMULATE(name, code)				\
 	do {								\
 		if (riscv_insn_is_##name(code)) {			\