MODINFOMD_SSYM
file_addmetadata(fp, MODINFOMD_SSYM, sizeof (ssym), &ssym);
md = file_findmetadata(fp, MODINFOMD_SSYM);
MODINFOMD_SSYM, MODINFOMD_ESYM, MODINFOMD_KERNEND,
md = file_findmetadata(kfp, MODINFOMD_SSYM);