efHeterogeneousSynchronization main.c 庞乐 commit at 2021-03-09

efHeterogeneousSynchronization/main.c

@@ -207,3 +207,18 @@ static void build_prologue(struct jit_ctx *ctx)
 		emit(ARM_SUB_R(r_skb_hl, r_skb_hl, r_scratch), ctx);
 	}
 
+	if (ctx->flags & FLAG_NEED_X_RESET)
+		emit(ARM_MOV_I(r_X, 0), ctx);
+
+	/* do not leak kernel data to userspace */
+	if ((first_inst != BPF_S_RET_K) && !(is_load_to_a(first_inst)))
+		emit(ARM_MOV_I(r_A, 0), ctx);
+
+	/* stack space for the BPF_MEM words */
+	if (ctx->seen & SEEN_MEM)
+		emit(ARM_SUB_I(ARM_SP, ARM_SP, mem_words_used(ctx) * 4), ctx);
+}
+
+static void build_epilogue(struct jit_ctx *ctx)
+{
+	u16 reg_set = saved_regs(ctx);