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examples/c: demo how to get IP for uprobe and uretprobe #221

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examples/c: demo how to get IP for uprobe and uretprobe #221

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Commits on Sep 26, 2023

  1. examples/c: demo how to get IP for uprobe and uretprobe 

    Show how it's possible to fetch user-space function's address from
uprobe and uretprobe BPF programs.

When uprobe example is run, you'll see:

```
Triggering user function test_func, addr 0x402bc2...
```

in the console output. And corresponding:

```
uprobe-1805730 [036] ....1 674139.123096: bpf_trace_printk: UPROBE    IP 0x402bc2.
uprobe-1805730 [036] ....1 674139.123110: bpf_trace_printk: URETPROBE IP 0x402bc2.
```

in /sys/kernel/debug/tracing/trace_pipe.

As you can see, those IPs match exactly.

ARM might need a bit of adjustment, I'm not sure, I think ARM can have
uprobe/uretprobe breakpoint installed not at the very first byte offset within
user space function.

Signed-off-by: Andrii Nakryiko <[email protected]>
    @anakryiko
    anakryiko committed Sep 26, 2023
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