add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/riscv/net/bpf_jit_core.c
..
..
@@ -83,6 +83,12 @@
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 		prog = orig_prog;
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 		goto out_offset;
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 	}
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+
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+	if (build_body(ctx, extra_pass, NULL)) {
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+		prog = orig_prog;
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+		goto out_offset;
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+	}
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+
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 	for (i = 0; i < prog->len; i++) {
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 		prev_ninsns += 32;
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 		ctx->offset[i] = prev_ninsns;
..
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@@ -91,11 +97,15 @@
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 	for (i = 0; i < NR_JIT_ITERATIONS; i++) {
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 		pass++;
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 		ctx->ninsns = 0;
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+
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+		bpf_jit_build_prologue(ctx);
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+		ctx->prologue_len = ctx->ninsns;
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+
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 		if (build_body(ctx, extra_pass, ctx->offset)) {
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 			prog = orig_prog;
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 			goto out_offset;
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 		}
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-		bpf_jit_build_prologue(ctx);
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+
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 		ctx->epilogue_offset = ctx->ninsns;
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 		bpf_jit_build_epilogue(ctx);
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@@ -153,6 +163,10 @@
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 	bpf_flush_icache(jit_data->header, ctx->insns + ctx->ninsns);
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 	if (!prog->is_func || extra_pass) {
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+		bpf_jit_binary_lock_ro(jit_data->header);
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+		for (i = 0; i < prog->len; i++)
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+			ctx->offset[i] = ninsns_rvoff(ctx->offset[i]);
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+		bpf_prog_fill_jited_linfo(prog, ctx->offset);
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 out_offset:
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 		kfree(ctx->offset);
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 		kfree(jit_data);
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@@ -165,3 +179,16 @@
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 					   tmp : orig_prog);
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 	return prog;
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 }
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+
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+void *bpf_jit_alloc_exec(unsigned long size)
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+{
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+	return __vmalloc_node_range(size, PAGE_SIZE, BPF_JIT_REGION_START,
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+				    BPF_JIT_REGION_END, GFP_KERNEL,
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+				    PAGE_KERNEL, 0, NUMA_NO_NODE,
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+				    __builtin_return_address(0));
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+}
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+
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+void bpf_jit_free_exec(void *addr)
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+{
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+	return vfree(addr);
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+}