linux-kernel - [PATCH v3 1/5] LoongArch: Add the function to generate the beq and bne assembly instructions.

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Message-Id: <20250709055029.723243-2-duanchenghao@kylinos.cn>
Date: Wed,  9 Jul 2025 13:50:25 +0800
From: Chenghao Duan <duanchenghao@...inos.cn>
To: ast@...nel.org,
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	Youling Tang <tangyouling@...inos.cn>
Subject: [PATCH v3 1/5] LoongArch: Add the function to generate the beq and bne assembly instructions.

Add branch jump function:
larch_insn_gen_beq
larch_insn_gen_bne

Co-developed-by: George Guo <guodongtai@...inos.cn>
Signed-off-by: George Guo <guodongtai@...inos.cn>
Co-developed-by: Youling Tang <tangyouling@...inos.cn>
Signed-off-by: Youling Tang <tangyouling@...inos.cn>
Signed-off-by: Chenghao Duan <duanchenghao@...inos.cn>
---
 arch/loongarch/include/asm/inst.h |  2 ++
 arch/loongarch/kernel/inst.c      | 28 ++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h
index 3089785ca..2ae96a35d 100644
--- a/arch/loongarch/include/asm/inst.h
+++ b/arch/loongarch/include/asm/inst.h
@@ -511,6 +511,8 @@ u32 larch_insn_gen_lu12iw(enum loongarch_gpr rd, int imm);
 u32 larch_insn_gen_lu32id(enum loongarch_gpr rd, int imm);
 u32 larch_insn_gen_lu52id(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm);
 u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm);
+u32 larch_insn_gen_beq(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm);
+u32 larch_insn_gen_bne(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm);
 
 static inline bool signed_imm_check(long val, unsigned int bit)
 {
diff --git a/arch/loongarch/kernel/inst.c b/arch/loongarch/kernel/inst.c
index 14d7d700b..674e3b322 100644
--- a/arch/loongarch/kernel/inst.c
+++ b/arch/loongarch/kernel/inst.c
@@ -336,3 +336,31 @@ u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm)
 
 	return insn.word;
 }
+
+u32 larch_insn_gen_beq(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm)
+{
+	union loongarch_instruction insn;
+
+	if ((imm & 3) || imm < -SZ_128K || imm >= SZ_128K) {
+		pr_warn("The generated beq instruction is out of range.\n");
+		return INSN_BREAK;
+	}
+
+	emit_beq(&insn, rj, rd, imm >> 2);
+
+	return insn.word;
+}
+
+u32 larch_insn_gen_bne(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm)
+{
+	union loongarch_instruction insn;
+
+	if ((imm & 3) || imm < -SZ_128K || imm >= SZ_128K) {
+		pr_warn("The generated bne instruction is out of range.\n");
+		return INSN_BREAK;
+	}
+
+	emit_bne(&insn, rj, rd, imm >> 2);
+
+	return insn.word;
+}
-- 
2.43.0