lib/bpf/gen_loader.c

565 	struct ksym_relo_desc *relo;
567 	relo = libbpf_reallocarray(gen->relos, gen->relo_cnt + 1, sizeof(*relo));
568 	if (!relo) {
572 	gen->relos = relo;
573 	relo += gen->relo_cnt;
574 	relo->name = name;
575 	relo->is_weak = is_weak;
576 	relo->is_typeless = is_typeless;
577 	relo->is_ld64 = is_ld64;
578 	relo->kind = kind;
579 	relo->insn_idx = insn_idx;
584 static struct ksym_desc *get_ksym_desc(struct bpf_gen *gen, struct ksym_relo_desc *relo)
591 		if (kdesc->kind == relo->kind && kdesc->is_ld64 == relo->is_ld64 &&
592 		    !strcmp(kdesc->name, relo->name)) {
604 	kdesc->name = relo->name;
605 	kdesc->kind = relo->kind;
609 	kdesc->is_ld64 = relo->is_ld64;
616 static void emit_bpf_find_by_name_kind(struct bpf_gen *gen, struct ksym_relo_desc *relo)
618 	int name_off, len = strlen(relo->name) + 1;
620 	name_off = add_data(gen, relo->name, len);
624 	emit(gen, BPF_MOV64_IMM(BPF_REG_3, relo->kind));
628 	debug_ret(gen, "find_by_name_kind(%s,%d)", relo->name, relo->kind);
635 static void emit_bpf_kallsyms_lookup_name(struct bpf_gen *gen, struct ksym_relo_desc *relo)
637 	int name_off, len = strlen(relo->name) + 1, res_off;
639 	name_off = add_data(gen, relo->name, len);
651 	debug_ret(gen, "kallsyms_lookup_name(%s,%d)", relo->name, relo->kind);
664 static void emit_relo_kfunc_btf(struct bpf_gen *gen, struct ksym_relo_desc *relo, int insn)
669 	kdesc = get_ksym_desc(gen, relo);
682 	emit_bpf_find_by_name_kind(gen, relo);
683 	if (!relo->is_weak)
689 			btf_fd_idx, relo->name);
727 		   relo->name, kdesc->ref);
732 		   relo->name, kdesc->ref);
735 static void emit_ksym_relo_log(struct bpf_gen *gen, struct ksym_relo_desc *relo,
745 		   relo->is_typeless, relo->is_weak, relo->name, ref);
748 		   relo->is_typeless, relo->is_weak, relo->name, ref);
755 				    struct ksym_relo_desc *relo, int insn)
759 	kdesc = get_ksym_desc(gen, relo);
774 	emit_bpf_kallsyms_lookup_name(gen, relo);
784 	emit_ksym_relo_log(gen, relo, kdesc->ref);
801 static void emit_relo_ksym_btf(struct bpf_gen *gen, struct ksym_relo_desc *relo, int insn)
806 	kdesc = get_ksym_desc(gen, relo);
823 	emit_bpf_find_by_name_kind(gen, relo);
824 	if (!relo->is_weak)
848 	emit_ksym_relo_log(gen, relo, kdesc->ref);
867 static void emit_relo(struct bpf_gen *gen, struct ksym_relo_desc *relo, int insns)
872 		 relo->kind, relo->name, relo->insn_idx, relo->is_ld64 ? "ld64" : "call");
873 	insn = insns + sizeof(struct bpf_insn) * relo->insn_idx;
875 	if (relo->is_ld64) {
876 		if (relo->is_typeless)
877 			emit_relo_ksym_typeless(gen, relo, insn);
879 			emit_relo_ksym_btf(gen, relo, insn);
881 		emit_relo_kfunc_btf(gen, relo, insn);