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libbpf: Support kfunc detection in light skeleton.

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Teach gen_loader to find {btf_id, btf_obj_fd} of kernel variables and kfuncs
and populate corresponding ld_imm64 and bpf_call insns.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230321203854.3035-4-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov
2023-03-21 13:38:53 -07:00
committed by Andrii Nakryiko
parent a5464a5b0e
commit 68cd7cd386
3 changed files with 27 additions and 22 deletions
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7
src/libbpf.c
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@@ -7070,18 +7070,21 @@ static int bpf_program_record_relos(struct bpf_program *prog)
for (i = 0; i < prog->nr_reloc; i++) {
struct reloc_desc *relo = &prog->reloc_desc[i];
struct extern_desc *ext = &obj->externs[relo->sym_off];
int kind;
switch (relo->type) {
case RELO_EXTERN_LD64:
if (ext->type != EXT_KSYM)
continue;
kind = btf_is_var(btf__type_by_id(obj->btf, ext->btf_id)) ?
BTF_KIND_VAR : BTF_KIND_FUNC;
bpf_gen__record_extern(obj->gen_loader, ext->name,
ext->is_weak, !ext->ksym.type_id,
BTF_KIND_VAR, relo->insn_idx);
true, kind, relo->insn_idx);
break;
case RELO_EXTERN_CALL:
bpf_gen__record_extern(obj->gen_loader, ext->name,
ext->is_weak, false, BTF_KIND_FUNC,
ext->is_weak, false, false, BTF_KIND_FUNC,
relo->insn_idx);
break;
case RELO_CORE: {