linux-kernel - [PATCH 04/10] RISC-V: KGDB: Refactor instructions

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Date:   Thu, 03 Aug 2023 19:10:29 -0700
From:   Charlie Jenkins <charlie@...osinc.com>
To:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
        bpf@...r.kernel.org
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Jason Baron <jbaron@...mai.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>, Nam Cao <namcaov@...il.com>,
        Charlie Jenkins <charlie@...osinc.com>
Subject: [PATCH 04/10] RISC-V: KGDB: Refactor instructions

Use shared instruction definitions in insn.h.

Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
---
 arch/riscv/kernel/kgdb.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/riscv/kernel/kgdb.c b/arch/riscv/kernel/kgdb.c
index 2393342ab362..e1305706120e 100644
--- a/arch/riscv/kernel/kgdb.c
+++ b/arch/riscv/kernel/kgdb.c
@@ -5,7 +5,6 @@
 
 #include <linux/ptrace.h>
 #include <linux/kdebug.h>
-#include <linux/bug.h>
 #include <linux/kgdb.h>
 #include <linux/irqflags.h>
 #include <linux/string.h>
@@ -25,12 +24,12 @@ static unsigned int stepped_opcode;
 
 static int decode_register_index(unsigned long opcode, int offset)
 {
-	return (opcode >> offset) & 0x1F;
+	return (opcode >> offset) & RV_STANDARD_REG_MASK;
 }
 
 static int decode_register_index_short(unsigned long opcode, int offset)
 {
-	return ((opcode >> offset) & 0x7) + 8;
+	return ((opcode >> offset) & RV_COMPRESSED_REG_MASK) + 8;
 }
 
 /* Calculate the new address for after a step */
@@ -43,7 +42,7 @@ static int get_step_address(struct pt_regs *regs, unsigned long *next_addr)
 
 	if (get_kernel_nofault(op_code, (void *)pc))
 		return -EINVAL;
-	if ((op_code & __INSN_LENGTH_MASK) != INSN_C_MASK) {
+	if (INSN_IS_C(op_code)) {
 		if (riscv_insn_is_c_jalr(op_code) ||
 		    riscv_insn_is_c_jr(op_code)) {
 			rs1_num = decode_register_index(op_code, RVC_C2_RS1_OPOFF);
@@ -55,14 +54,14 @@ static int get_step_address(struct pt_regs *regs, unsigned long *next_addr)
 			rs1_num = decode_register_index_short(op_code,
 							      RVC_C1_RS1_OPOFF);
 			if (!rs1_num || regs_ptr[rs1_num] == 0)
-				*next_addr = RVC_EXTRACT_BTYPE_IMM(op_code) + pc;
+				*next_addr = RVC_EXTRACT_BZ_IMM(op_code) + pc;
 			else
 				*next_addr = pc + 2;
 		} else if (riscv_insn_is_c_bnez(op_code)) {
 			rs1_num =
 			    decode_register_index_short(op_code, RVC_C1_RS1_OPOFF);
 			if (rs1_num && regs_ptr[rs1_num] != 0)
-				*next_addr = RVC_EXTRACT_BTYPE_IMM(op_code) + pc;
+				*next_addr = RVC_EXTRACT_BZ_IMM(op_code) + pc;
 			else
 				*next_addr = pc + 2;
 		} else {

-- 
2.34.1