add top-level SPDX license tag

[dpdk.git] / lib / librte_bpf / bpf_jit_x86.c

diff --git a/lib/librte_bpf/bpf_jit_x86.c b/lib/librte_bpf/bpf_jit_x86.c
index 111e028..f70cd6b 100644 (file)
--- a/lib/librte_bpf/bpf_jit_x86.c
+++ b/lib/librte_bpf/bpf_jit_x86.c
@@ -113,20 +113,6 @@ union bpf_jit_imm {
        uint8_t u8[4];
 };
 
-static size_t
-bpf_size(uint32_t bpf_op_sz)
-{
-       if (bpf_op_sz == BPF_B)
-               return sizeof(uint8_t);
-       else if (bpf_op_sz == BPF_H)
-               return sizeof(uint16_t);
-       else if (bpf_op_sz == BPF_W)
-               return sizeof(uint32_t);
-       else if (bpf_op_sz == EBPF_DW)
-               return sizeof(uint64_t);
-       return 0;
-}
-
 /*
  * In many cases for imm8 we can produce shorter code.
  */
@@ -222,6 +208,19 @@ emit_sib(struct bpf_jit_state *st, uint32_t scale, uint32_t idx, uint32_t base)
        emit_bytes(st, &v, sizeof(v));
 }
 
+/*
+ * emit OPCODE+REGIDX byte
+ */
+static void
+emit_opcode(struct bpf_jit_state *st, uint8_t ops, uint32_t reg)
+{
+       uint8_t v;
+
+       v = ops | (reg & 7);
+       emit_bytes(st, &v, sizeof(v));
+}
+
+
 /*
  * emit xchg %<sreg>, %<dreg>
  */
@@ -486,19 +485,18 @@ static void
 emit_ld_imm64(struct bpf_jit_state *st, uint32_t dreg, uint32_t imm0,
        uint32_t imm1)
 {
+       uint32_t op;
+
        const uint8_t ops = 0xB8;
 
-       if (imm1 == 0) {
-               emit_mov_imm(st, EBPF_ALU64 | EBPF_MOV | BPF_K, dreg, imm0);
-               return;
-       }
+       op = (imm1 == 0) ? BPF_ALU : EBPF_ALU64;
 
-       emit_rex(st, EBPF_ALU64, 0, dreg);
-       emit_bytes(st, &ops, sizeof(ops));
-       emit_modregrm(st, MOD_DIRECT, 0, dreg);
+       emit_rex(st, op, 0, dreg);
+       emit_opcode(st, ops, dreg);
 
        emit_imm(st, imm0, sizeof(imm0));
-       emit_imm(st, imm1, sizeof(imm1));
+       if (imm1 != 0)
+               emit_imm(st, imm1, sizeof(imm1));
 }
 
 /*
@@ -1294,7 +1292,8 @@ emit(struct bpf_jit_state *st, const struct rte_bpf *bpf)
                        break;
                /* call instructions */
                case (BPF_JMP | EBPF_CALL):
-                       emit_call(st, (uintptr_t)bpf->prm.xsym[ins->imm].func);
+                       emit_call(st,
+                               (uintptr_t)bpf->prm.xsym[ins->imm].func.val);
                        break;
                /* return instruction */
                case (BPF_JMP | EBPF_EXIT):