examples/c: demo how to get IP for uprobe and uretprobe #221
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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]>
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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:
in the console output. And corresponding:
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.