[RFC PATCH 09/13] bpf tools: Register extern functions for ubpf programs

Introduce libbpf_register_ubpf_func(), allow caller (perf) to register extern functions. Registered functions are stored into an array and registered to each ubpf_vm when loading. Signed-off-by: Wang Nan Cc: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov

[RFC PATCH 09/13] bpf tools: Register extern functions for ubpf programs

Introduce libbpf_register_ubpf_func(), allow caller (perf) to register extern functions. Registered functions are stored into an array and registered to each ubpf_vm when loading. Signed-off-by: Wang Nan Cc: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Brendan Gregg Cc: Jiri Olsa Cc: