linux-kernel - [PATCH 02/11] riscv: kprobes: Move branch

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Message-Id: <71c57502962d8b2663fd2fb74738374e1ead740d.1746997351.git.namcao@linutronix.de>
Date: Sun, 11 May 2025 23:17:54 +0200
From: Nam Cao <namcao@...utronix.de>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Nam Cao <namcao@...utronix.de>
Subject: [PATCH 02/11] riscv: kprobes: Move branch_funct3 to insn.h

Similar to other instruction-processing macros/functions, branch_funct3
should be in insn.h.

Move it into insn.h as RV_EXTRACT_FUNCT3. This new name matches the style
in insn.h.

Signed-off-by: Nam Cao <namcao@...utronix.de>
---
 arch/riscv/include/asm/insn.h            | 4 ++++
 arch/riscv/kernel/probes/simulate-insn.c | 5 +----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/include/asm/insn.h b/arch/riscv/include/asm/insn.h
index debac13a3476..80901b36fd22 100644
--- a/arch/riscv/include/asm/insn.h
+++ b/arch/riscv/include/asm/insn.h
@@ -292,6 +292,10 @@ static __always_inline bool riscv_insn_is_c_jalr(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_FUNCT3(x) \
+	({typeof(x) x_ = (x); \
+	(RV_X(x_, RV_INSN_FUNCT3_OPOFF, RV_INSN_FUNCT3_MASK >> RV_INSN_FUNCT3_OPOFF)); })
+
 #define RV_EXTRACT_RS1_REG(x) \
 	({typeof(x) x_ = (x); \
 	(RV_X(x_, RVG_RS1_OPOFF, RVG_RS1_MASK)); })
diff --git a/arch/riscv/kernel/probes/simulate-insn.c b/arch/riscv/kernel/probes/simulate-insn.c
index 77be381bb8b4..d5f74fadbc3a 100644
--- a/arch/riscv/kernel/probes/simulate-insn.c
+++ b/arch/riscv/kernel/probes/simulate-insn.c
@@ -121,9 +121,6 @@ bool __kprobes simulate_auipc(u32 opcode, unsigned long addr, struct pt_regs *re
 #define branch_rs1_idx(opcode) \
 	(((opcode) >> 15) & 0x1f)
 
-#define branch_funct3(opcode) \
-	(((opcode) >> 12) & 0x7)
-
 #define branch_imm(opcode) \
 	(((((opcode) >>  8) & 0xf ) <<  1) | \
 	 ((((opcode) >> 25) & 0x3f) <<  5) | \
@@ -158,7 +155,7 @@ bool __kprobes simulate_branch(u32 opcode, unsigned long addr, struct pt_regs *r
 		return false;
 
 	offset_tmp = branch_offset(opcode);
-	switch (branch_funct3(opcode)) {
+	switch (RV_EXTRACT_FUNCT3(opcode)) {
 	case RVG_FUNCT3_BEQ:
 		offset = (rs1_val == rs2_val) ? offset_tmp : 4;
 		break;
-- 
2.39.5