Andrii Nakryiko c5a7244759
bpf: move subprog call logic back to verifier.c ...
Subprog call logic in btf_check_subprog_call() currently has both a lot
of BTF parsing logic (which is, presumably, what justified putting it
into btf.c), but also a bunch of register state checks, some of each
utilize deep verifier logic helpers, necessarily exported from
verifier.c: check_ptr_off_reg(), check_func_arg_reg_off(),
and check_mem_reg().
Going forward, btf_check_subprog_call() will have a minimum of
BTF-related logic, but will get more internal verifier logic related to
register state manipulation. So move it into verifier.c to minimize
amount of verifier-specific logic exposed to btf.c.
We do this move before refactoring btf_check_func_arg_match() to
preserve as much history post-refactoring as possible.
No functional changes.
Acked-by: Eduard Zingerman <eddyz87@gmail.com >
Signed-off-by: Andrii Nakryiko <andrii@kernel.org >
Link: https://lore.kernel.org/r/20231215011334.2307144-5-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org >
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