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LoongArch: Add larch_insn_gen_{beq,bne} helpers

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Add larch_insn_gen_beq() and larch_insn_gen_bne() helpers which will be
used in BPF trampoline implementation.

Reviewed-by: Hengqi Chen <hengqi.chen@gmail.com>
Co-developed-by: George Guo <guodongtai@kylinos.cn>
Signed-off-by: George Guo <guodongtai@kylinos.cn>
Co-developed-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Chenghao Duan 2025-08-03 22:49:50 +08:00 committed by Huacai Chen
parent 2362e8124e
commit 6ab55e0a9e
2 changed files with 30 additions and 0 deletions
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2
arch/loongarch/include/asm/inst.h
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@ -510,6 +510,8 @@ u32 larch_insn_gen_move(enum loongarch_gpr rd, enum loongarch_gpr rj);
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_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);
u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm);
static inline bool signed_imm_check(long val, unsigned int bit)

28
arch/loongarch/kernel/inst.c
View File

@ -323,6 +323,34 @@ u32 larch_insn_gen_lu52id(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;
}
u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm)
{
union loongarch_instruction insn;