Method loadKconfigSection

elf_reader.go:1456–1486

loadKconfigSection handles the 'virtual' Datasec .kconfig that doesn't have a corresponding ELF section and exist purely in BTF.

()

// loadKconfigSection handles the 'virtual' Datasec .kconfig that doesn't
// have a corresponding ELF section and exist purely in BTF.
func (ec *elfCode) loadKconfigSection() error {
	if ec.btf == nil {
		return nil
	}

	var ds *btf.Datasec
	err := ec.btf.TypeByName(".kconfig", &ds)
	if errors.Is(err, btf.ErrNotFound) {
		return nil
	}
	if err != nil {
		return err
	}

	if ds.Size == 0 {
		return errors.New("zero-length .kconfig")
	}

	ec.kconfig = &MapSpec{
		Name:       ".kconfig",
		Type:       Array,
		KeySize:    uint32(4),
		ValueSize:  ds.Size,
		MaxEntries: 1,
		Flags:      sys.BPF_F_RDONLY_PROG,
		Key:        &btf.Int{Size: 4},
		Value:      ds,
	}

	return nil
}

// loadKsymsSection handles the 'virtual' Datasec .ksyms that doesn't
// have a corresponding ELF section and exist purely in BTF.