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LoongArch: BPF: Clean up and decouple is32 parameter from move_imm()
The current move_imm() relies on the 'is32' parameter for both ALU32 and JMP32, forcing the helper to internally clear the upper 32 bits. However this parameter is redundant for all 64-bit immediate loads. Furthermore, it is even undesirable for load/store signed address offset computations. Clean up move_imm() by removing the 'is32' parameter which allows it to focus on loading values, while moving the zero-extension logic outward to the explicit callers. For 64-bit and load-store operations, just drop the parameter. This is preparation for later patch, no functional changes. Acked-by: Hengqi Chen <hengqi.chen@gmail.com> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Tiezhu Yang
Huacai Chen
parent
67ab1a3314
commit
b3e1c11698
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@ -194,7 +194,7 @@ static void build_prologue(struct jit_ctx *ctx)
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ctx->stack_size = stack_adjust;
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if (ctx->arena_vm_start)
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move_imm(ctx, REG_ARENA, ctx->arena_vm_start, false);
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move_imm(ctx, REG_ARENA, ctx->arena_vm_start);
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}
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static void __build_epilogue(struct jit_ctx *ctx, bool is_tail_call)
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@ -339,7 +339,7 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx, int insn)
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static void emit_store_stack_imm64(struct jit_ctx *ctx, int reg, int stack_off, u64 imm64)
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{
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move_imm(ctx, reg, imm64, false);
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move_imm(ctx, reg, imm64);
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emit_insn(ctx, std, reg, LOONGARCH_GPR_FP, stack_off);
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}
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@ -355,7 +355,7 @@ static int emit_atomic_rmw(const struct bpf_insn *insn, struct jit_ctx *ctx)
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const s32 imm = insn->imm;
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const bool isdw = BPF_SIZE(insn->code) == BPF_DW;
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move_imm(ctx, t1, off, false);
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move_imm(ctx, t1, off);
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emit_insn(ctx, addd, t1, dst, t1);
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move_reg(ctx, t3, src);
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@ -528,7 +528,7 @@ static int emit_atomic_ld_st(const struct bpf_insn *insn, struct jit_ctx *ctx)
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if (is_signed_imm12(off)) {
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emit_insn(ctx, ldbu, dst, src, off);
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} else {
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move_imm(ctx, t1, off, false);
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move_imm(ctx, t1, off);
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emit_insn(ctx, ldxbu, dst, src, t1);
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}
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break;
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@ -536,7 +536,7 @@ static int emit_atomic_ld_st(const struct bpf_insn *insn, struct jit_ctx *ctx)
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if (is_signed_imm12(off)) {
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emit_insn(ctx, ldhu, dst, src, off);
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} else {
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move_imm(ctx, t1, off, false);
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move_imm(ctx, t1, off);
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emit_insn(ctx, ldxhu, dst, src, t1);
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}
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break;
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@ -544,7 +544,7 @@ static int emit_atomic_ld_st(const struct bpf_insn *insn, struct jit_ctx *ctx)
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if (is_signed_imm12(off)) {
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emit_insn(ctx, ldwu, dst, src, off);
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} else {
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move_imm(ctx, t1, off, false);
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move_imm(ctx, t1, off);
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emit_insn(ctx, ldxwu, dst, src, t1);
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}
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break;
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@ -552,7 +552,7 @@ static int emit_atomic_ld_st(const struct bpf_insn *insn, struct jit_ctx *ctx)
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if (is_signed_imm12(off)) {
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emit_insn(ctx, ldd, dst, src, off);
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} else {
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move_imm(ctx, t1, off, false);
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move_imm(ctx, t1, off);
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emit_insn(ctx, ldxd, dst, src, t1);
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}
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break;
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@ -567,7 +567,7 @@ static int emit_atomic_ld_st(const struct bpf_insn *insn, struct jit_ctx *ctx)
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if (is_signed_imm12(off)) {
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emit_insn(ctx, stb, src, dst, off);
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} else {
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move_imm(ctx, t1, off, false);
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move_imm(ctx, t1, off);
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emit_insn(ctx, stxb, src, dst, t1);
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}
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break;
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@ -575,7 +575,7 @@ static int emit_atomic_ld_st(const struct bpf_insn *insn, struct jit_ctx *ctx)
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if (is_signed_imm12(off)) {
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emit_insn(ctx, sth, src, dst, off);
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} else {
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move_imm(ctx, t1, off, false);
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move_imm(ctx, t1, off);
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emit_insn(ctx, stxh, src, dst, t1);
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}
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break;
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@ -583,7 +583,7 @@ static int emit_atomic_ld_st(const struct bpf_insn *insn, struct jit_ctx *ctx)
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if (is_signed_imm12(off)) {
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emit_insn(ctx, stw, src, dst, off);
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} else {
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move_imm(ctx, t1, off, false);
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move_imm(ctx, t1, off);
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emit_insn(ctx, stxw, src, dst, t1);
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}
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break;
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@ -591,7 +591,7 @@ static int emit_atomic_ld_st(const struct bpf_insn *insn, struct jit_ctx *ctx)
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if (is_signed_imm12(off)) {
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emit_insn(ctx, std, src, dst, off);
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} else {
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move_imm(ctx, t1, off, false);
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move_imm(ctx, t1, off);
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emit_insn(ctx, stxd, src, dst, t1);
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}
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break;
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@ -716,7 +716,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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if (insn_is_cast_user(insn)) {
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move_reg(ctx, t1, src);
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emit_zext_32(ctx, t1, true);
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move_imm(ctx, dst, (ctx->user_vm_start >> 32) << 32, false);
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move_imm(ctx, dst, (ctx->user_vm_start >> 32) << 32);
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emit_insn(ctx, beq, t1, LOONGARCH_GPR_ZERO, 2);
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emit_insn(ctx, or, t1, dst, t1);
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move_reg(ctx, dst, t1);
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@ -753,7 +753,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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/* dst = imm */
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case BPF_ALU | BPF_MOV | BPF_K:
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case BPF_ALU64 | BPF_MOV | BPF_K:
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move_imm(ctx, dst, imm, is32);
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move_imm(ctx, dst, imm);
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emit_zext_32(ctx, dst, is32);
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break;
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/* dst = dst + src */
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@ -769,7 +770,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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if (is_signed_imm12(imm)) {
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emit_insn(ctx, addid, dst, dst, imm);
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} else {
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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emit_zext_32(ctx, t1, is32);
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emit_insn(ctx, addd, dst, dst, t1);
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}
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emit_zext_32(ctx, dst, is32);
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@ -788,7 +790,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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if (is_signed_imm12(-imm)) {
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emit_insn(ctx, addid, dst, dst, -imm);
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} else {
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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emit_zext_32(ctx, t1, is32);
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emit_insn(ctx, subd, dst, dst, t1);
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}
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emit_zext_32(ctx, dst, is32);
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@ -804,7 +807,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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/* dst = dst * imm */
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case BPF_ALU | BPF_MUL | BPF_K:
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case BPF_ALU64 | BPF_MUL | BPF_K:
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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emit_zext_32(ctx, t1, is32);
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emit_insn(ctx, muld, dst, dst, t1);
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emit_zext_32(ctx, dst, is32);
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break;
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@ -831,12 +835,13 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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case BPF_ALU | BPF_DIV | BPF_K:
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case BPF_ALU64 | BPF_DIV | BPF_K:
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if (!off) {
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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emit_zext_32(ctx, t1, is32);
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emit_zext_32(ctx, dst, is32);
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emit_insn(ctx, divdu, dst, dst, t1);
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emit_zext_32(ctx, dst, is32);
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} else {
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move_imm(ctx, t1, imm, false);
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move_imm(ctx, t1, imm);
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emit_sext_32(ctx, t1, is32);
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emit_sext_32(ctx, dst, is32);
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emit_insn(ctx, divd, dst, dst, t1);
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@ -866,12 +871,13 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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case BPF_ALU | BPF_MOD | BPF_K:
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case BPF_ALU64 | BPF_MOD | BPF_K:
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if (!off) {
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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emit_zext_32(ctx, t1, is32);
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emit_zext_32(ctx, dst, is32);
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emit_insn(ctx, moddu, dst, dst, t1);
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emit_zext_32(ctx, dst, is32);
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} else {
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move_imm(ctx, t1, imm, false);
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move_imm(ctx, t1, imm);
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emit_sext_32(ctx, t1, is32);
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emit_sext_32(ctx, dst, is32);
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emit_insn(ctx, modd, dst, dst, t1);
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@ -899,7 +905,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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if (is_unsigned_imm12(imm)) {
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emit_insn(ctx, andi, dst, dst, imm);
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} else {
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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emit_zext_32(ctx, t1, is32);
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emit_insn(ctx, and, dst, dst, t1);
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}
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emit_zext_32(ctx, dst, is32);
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@ -918,7 +925,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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if (is_unsigned_imm12(imm)) {
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emit_insn(ctx, ori, dst, dst, imm);
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} else {
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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emit_zext_32(ctx, t1, is32);
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emit_insn(ctx, or, dst, dst, t1);
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}
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emit_zext_32(ctx, dst, is32);
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@ -937,7 +945,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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if (is_unsigned_imm12(imm)) {
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emit_insn(ctx, xori, dst, dst, imm);
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} else {
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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emit_zext_32(ctx, t1, is32);
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emit_insn(ctx, xor, dst, dst, t1);
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}
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emit_zext_32(ctx, dst, is32);
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@ -1097,7 +1106,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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case BPF_JMP32 | BPF_JSLE | BPF_K:
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jmp_offset = bpf2la_offset(i, off, ctx);
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if (imm) {
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move_imm(ctx, t1, imm, false);
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move_imm(ctx, t1, imm);
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tm = t1;
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} else {
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/* If imm is 0, simply use zero register. */
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@ -1129,7 +1138,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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case BPF_JMP | BPF_JSET | BPF_K:
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case BPF_JMP32 | BPF_JSET | BPF_K:
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jmp_offset = bpf2la_offset(i, off, ctx);
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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emit_zext_32(ctx, t1, is32);
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emit_insn(ctx, and, t1, dst, t1);
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emit_zext_32(ctx, t1, is32);
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if (emit_cond_jmp(ctx, cond, t1, LOONGARCH_GPR_ZERO, jmp_offset) < 0)
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@ -1227,7 +1237,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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if (bpf_pseudo_func(insn))
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move_addr(ctx, dst, imm64);
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else
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move_imm(ctx, dst, imm64, is32);
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move_imm(ctx, dst, imm64);
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return 1;
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}
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@ -1268,7 +1278,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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else
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emit_insn(ctx, ldbu, dst, src, off);
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} else {
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move_imm(ctx, t1, off, is32);
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move_imm(ctx, t1, off);
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if (sign_extend)
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emit_insn(ctx, ldxb, dst, src, t1);
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else
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@ -1282,7 +1292,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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else
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emit_insn(ctx, ldhu, dst, src, off);
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} else {
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move_imm(ctx, t1, off, is32);
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move_imm(ctx, t1, off);
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if (sign_extend)
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emit_insn(ctx, ldxh, dst, src, t1);
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else
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@ -1296,7 +1306,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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else
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emit_insn(ctx, ldwu, dst, src, off);
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} else {
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move_imm(ctx, t1, off, is32);
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move_imm(ctx, t1, off);
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if (sign_extend)
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emit_insn(ctx, ldxw, dst, src, t1);
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else
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@ -1304,7 +1314,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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}
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break;
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case BPF_DW:
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move_imm(ctx, t1, off, is32);
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move_imm(ctx, t1, off);
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emit_insn(ctx, ldxd, dst, src, t1);
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break;
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}
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@ -1331,42 +1341,42 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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switch (BPF_SIZE(code)) {
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case BPF_B:
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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if (is_signed_imm12(off)) {
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emit_insn(ctx, stb, t1, dst, off);
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} else {
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move_imm(ctx, t2, off, is32);
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move_imm(ctx, t2, off);
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emit_insn(ctx, stxb, t1, dst, t2);
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}
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break;
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case BPF_H:
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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if (is_signed_imm12(off)) {
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emit_insn(ctx, sth, t1, dst, off);
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} else {
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move_imm(ctx, t2, off, is32);
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move_imm(ctx, t2, off);
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emit_insn(ctx, stxh, t1, dst, t2);
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}
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break;
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case BPF_W:
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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if (is_signed_imm12(off)) {
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emit_insn(ctx, stw, t1, dst, off);
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} else if (is_signed_imm14(off)) {
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emit_insn(ctx, stptrw, t1, dst, off);
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} else {
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move_imm(ctx, t2, off, is32);
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move_imm(ctx, t2, off);
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emit_insn(ctx, stxw, t1, dst, t2);
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}
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break;
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case BPF_DW:
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move_imm(ctx, t1, imm, is32);
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move_imm(ctx, t1, imm);
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if (is_signed_imm12(off)) {
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emit_insn(ctx, std, t1, dst, off);
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} else if (is_signed_imm14(off)) {
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emit_insn(ctx, stptrd, t1, dst, off);
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} else {
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move_imm(ctx, t2, off, is32);
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move_imm(ctx, t2, off);
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emit_insn(ctx, stxd, t1, dst, t2);
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}
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break;
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@ -1397,7 +1407,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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if (is_signed_imm12(off)) {
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emit_insn(ctx, stb, src, dst, off);
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} else {
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move_imm(ctx, t1, off, is32);
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move_imm(ctx, t1, off);
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emit_insn(ctx, stxb, src, dst, t1);
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}
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break;
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@ -1405,7 +1415,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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if (is_signed_imm12(off)) {
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emit_insn(ctx, sth, src, dst, off);
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} else {
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move_imm(ctx, t1, off, is32);
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move_imm(ctx, t1, off);
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emit_insn(ctx, stxh, src, dst, t1);
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}
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break;
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@ -1415,7 +1425,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
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} else if (is_signed_imm14(off)) {
|
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emit_insn(ctx, stptrw, src, dst, off);
|
||||
} else {
|
||||
move_imm(ctx, t1, off, is32);
|
||||
move_imm(ctx, t1, off);
|
||||
emit_insn(ctx, stxw, src, dst, t1);
|
||||
}
|
||||
break;
|
||||
|
|
@ -1425,7 +1435,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
|
|||
} else if (is_signed_imm14(off)) {
|
||||
emit_insn(ctx, stptrd, src, dst, off);
|
||||
} else {
|
||||
move_imm(ctx, t1, off, is32);
|
||||
move_imm(ctx, t1, off);
|
||||
emit_insn(ctx, stxd, src, dst, t1);
|
||||
}
|
||||
break;
|
||||
|
|
@ -1537,7 +1547,7 @@ static int emit_jump_and_link(struct jit_ctx *ctx, u8 rd, u64 target)
|
|||
return -EFAULT;
|
||||
}
|
||||
|
||||
move_imm(ctx, LOONGARCH_GPR_T1, target, false);
|
||||
move_imm(ctx, LOONGARCH_GPR_T1, target);
|
||||
emit_insn(ctx, jirl, rd, LOONGARCH_GPR_T1, 0);
|
||||
|
||||
return 0;
|
||||
|
|
@ -1734,7 +1744,7 @@ static int invoke_bpf_prog(struct jit_ctx *ctx, struct bpf_tramp_image *im,
|
|||
emit_insn(ctx, std, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_FP, -run_ctx_off + cookie_off);
|
||||
|
||||
/* arg1: prog */
|
||||
move_imm(ctx, LOONGARCH_GPR_A0, (const s64)p, false);
|
||||
move_imm(ctx, LOONGARCH_GPR_A0, (const s64)p);
|
||||
/* arg2: &run_ctx */
|
||||
emit_insn(ctx, addid, LOONGARCH_GPR_A1, LOONGARCH_GPR_FP, -run_ctx_off);
|
||||
ret = emit_call(ctx, (const u64)bpf_trampoline_enter(p));
|
||||
|
|
@ -1755,7 +1765,7 @@ static int invoke_bpf_prog(struct jit_ctx *ctx, struct bpf_tramp_image *im,
|
|||
/* arg1: &args_off */
|
||||
emit_insn(ctx, addid, LOONGARCH_GPR_A0, LOONGARCH_GPR_FP, -args_off);
|
||||
if (!p->jited)
|
||||
move_imm(ctx, LOONGARCH_GPR_A1, (const s64)p->insnsi, false);
|
||||
move_imm(ctx, LOONGARCH_GPR_A1, (const s64)p->insnsi);
|
||||
ret = emit_call(ctx, (const u64)p->bpf_func);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
|
@ -1772,7 +1782,7 @@ static int invoke_bpf_prog(struct jit_ctx *ctx, struct bpf_tramp_image *im,
|
|||
}
|
||||
|
||||
/* arg1: prog */
|
||||
move_imm(ctx, LOONGARCH_GPR_A0, (const s64)p, false);
|
||||
move_imm(ctx, LOONGARCH_GPR_A0, (const s64)p);
|
||||
/* arg2: prog start time */
|
||||
move_reg(ctx, LOONGARCH_GPR_A1, LOONGARCH_GPR_S1);
|
||||
/* arg3: &run_ctx */
|
||||
|
|
|
|||
|
|
@ -137,7 +137,7 @@ static inline void move_addr(struct jit_ctx *ctx, enum loongarch_gpr rd, u64 add
|
|||
emit_insn(ctx, lu52id, rd, rd, imm_63_52);
|
||||
}
|
||||
|
||||
static inline void move_imm(struct jit_ctx *ctx, enum loongarch_gpr rd, long imm, bool is32)
|
||||
static inline void move_imm(struct jit_ctx *ctx, enum loongarch_gpr rd, long imm)
|
||||
{
|
||||
long imm_11_0, imm_31_12, imm_51_32, imm_63_52, imm_51_0, imm_51_31;
|
||||
|
||||
|
|
@ -150,7 +150,7 @@ static inline void move_imm(struct jit_ctx *ctx, enum loongarch_gpr rd, long imm
|
|||
/* addiw rd, $zero, imm_11_0 */
|
||||
if (is_signed_imm12(imm)) {
|
||||
emit_insn(ctx, addiw, rd, LOONGARCH_GPR_ZERO, imm);
|
||||
goto zext;
|
||||
return;
|
||||
}
|
||||
|
||||
/* ori rd, $zero, imm_11_0 */
|
||||
|
|
@ -195,9 +195,6 @@ static inline void move_imm(struct jit_ctx *ctx, enum loongarch_gpr rd, long imm
|
|||
if (!is_signed_imm52(imm))
|
||||
emit_insn(ctx, lu52id, rd, rd, imm_63_52);
|
||||
}
|
||||
|
||||
zext:
|
||||
emit_zext_32(ctx, rd, is32);
|
||||
}
|
||||
|
||||
static inline void move_reg(struct jit_ctx *ctx, enum loongarch_gpr rd,
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user