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Getting function's address from BPF_TRACE_FENTRY BPF program

Yutaro Hayakawa
 

Hello,

Is there any way to get the address of the function in fentry type programs like
kprobe type programs does by PT_REGS_IP(pt_regs)?

I'd like to migrate my kprobe based tool[1] to fentry based one, but only this
feature is missing right now. Since the tool attaches single BPF program to
the multiple kernel functions, it needs to have function's address to identify
which function the trace data comes from.

Regards,
Yutaro
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