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Subject[PATCH v1 2/4] LoongArch: Add larch_insn_gen_break() to generate break insns
Date
There exist various break insns such as BRK_KPROBE_BP, BRK_KPROBE_SSTEPBP,
BRK_UPROBE_BP and BRK_UPROBE_XOLBP, add larch_insn_gen_break() to generate
break insns simpler and easier, this is preparation for later patch.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
arch/loongarch/include/asm/inst.h | 12 ++++++++++++
arch/loongarch/kernel/inst.c | 9 +++++++++
2 files changed, 21 insertions(+)

diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h
index af494b5..95b3c20 100644
--- a/arch/loongarch/include/asm/inst.h
+++ b/arch/loongarch/include/asm/inst.h
@@ -456,6 +456,8 @@ u32 larch_insn_gen_nop(void);
u32 larch_insn_gen_b(unsigned long pc, unsigned long dest);
u32 larch_insn_gen_bl(unsigned long pc, unsigned long dest);

+u32 larch_insn_gen_break(int imm);
+
u32 larch_insn_gen_or(enum loongarch_gpr rd, enum loongarch_gpr rj, enum loongarch_gpr rk);
u32 larch_insn_gen_move(enum loongarch_gpr rd, enum loongarch_gpr rj);

@@ -474,6 +476,16 @@ static inline bool unsigned_imm_check(unsigned long val, unsigned int bit)
return val < (1UL << bit);
}

+#define DEF_EMIT_REG0I15_FORMAT(NAME, OP) \
+static inline void emit_##NAME(union loongarch_instruction *insn, \
+ int imm) \
+{ \
+ insn->reg0i15_format.opcode = OP; \
+ insn->reg0i15_format.immediate = imm; \
+}
+
+DEF_EMIT_REG0I15_FORMAT(break, break_op)
+
#define DEF_EMIT_REG0I26_FORMAT(NAME, OP) \
static inline void emit_##NAME(union loongarch_instruction *insn, \
int offset) \
diff --git a/arch/loongarch/kernel/inst.c b/arch/loongarch/kernel/inst.c
index 258ef26..31b8efe 100644
--- a/arch/loongarch/kernel/inst.c
+++ b/arch/loongarch/kernel/inst.c
@@ -208,6 +208,15 @@ u32 larch_insn_gen_bl(unsigned long pc, unsigned long dest)
return insn.word;
}

+u32 larch_insn_gen_break(int imm)
+{
+ union loongarch_instruction insn;
+
+ emit_break(&insn, imm);
+
+ return insn.word;
+}
+
u32 larch_insn_gen_or(enum loongarch_gpr rd, enum loongarch_gpr rj, enum loongarch_gpr rk)
{
union loongarch_instruction insn;
--
2.1.0
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