Add larch_insn_gen_beq() and larch_insn_gen_bne() helpers which will be used in BPF trampoline implementation. Co-developed-by: George Guo Signed-off-by: George Guo Co-developed-by: Youling Tang Signed-off-by: Youling Tang Signed-off-by: Chenghao Duan Reviewed-by: Hengqi Chen Reviewed-by: Huacai Chen --- 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; +} -- 2.25.1