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DisassemblerTest.java
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DisassemblerTest.java
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/**
* Use disassembler to disassemble eBPF bytecode of HelloMap
*/
package me.bechberger.ebpf.samples.own;
import me.bechberger.ebpf.bcc.BPF;
public class DisassemblerTest {
public static void main(String[] args) {
try (var b = BPF.builder("""
BPF_HASH(counter_table);
int hello(void *ctx) {
u64 uid;
u64 counter = 0;
u64 *p;
uid = bpf_get_current_uid_gid() & 0xFFFFFFFF;
p = counter_table.lookup(&uid);
if (p != 0) {
counter = *p;
}
counter++;
counter_table.update(&uid, &counter);
return 0;
}
""").build()) {
var expected = """
Disassemble of BPF program hello:
0: (85) call bpf_get_current_uid_gid#15
1: (67) r0 <<= 32
2: (77) r0 >>= 32
3: (7b) *(u64*)(r10 -8) = r0
4: (18) r1 = <map at fd #4>
6: (64-bit upper word)
6: (bf) r2 = r10
7: (07) r2 += -8
8: (85) call bpf_map_lookup_elem#1
9: (b7) r1 = 1
10: (15) if r0 == 0 goto pc+2 <13>
11: (79) r1 = *(u64*)(r0 +0)
12: (07) r1 += 1
13: (7b) *(u64*)(r10 -16) = r1
14: (18) r1 = <map at fd #4>
16: (64-bit upper word)
16: (bf) r2 = r10
17: (07) r2 += -8
18: (bf) r3 = r10
19: (07) r3 += -16
20: (b7) r4 = 0
21: (85) call bpf_map_update_elem#2
22: (b7) r0 = 0
23: (95) exit
""";
var actual = b.disassemble_func("hello");
System.out.println(actual);
if (!actual.equals(expected)) {
System.out.println("Differs from the output of the similar Python program");
}
}
}
}