case macho.LoadCmdDysymtab:
			err = machoUpdateLoadCommand(reader, linkseg, linkoffset, &macho.DysymtabCmd{}, "Tocoffset", "Modtaboff", "Extrefsymoff", "Indirectsymoff", "Extreloff", "Locreloff")
		case LC_CODE_SIGNATURE, LC_SEGMENT_SPLIT_INFO, LC_FUNCTION_STARTS, LC_DATA_IN_CODE, LC_DYLIB_CODE_SIGN_DRS,
			LC_DYLD_EXPORTS_TRIE, LC_DYLD_CHAINED_FIXUPS:

	ml.data[12] = uint32(base + s1)     /* indirectsymoff */
	ml.data[13] = uint32((s2 + s3) / 4) /* nindirectsyms */

	ml.data[14] = 0 /* extreloff */
	ml.data[15] = 0 /* nextrel */
	ml.data[16] = 0 /* locreloff */
	ml.data[17] = 0 /* nlocrel */
}

func doMachoLink(ctxt *Link) int64 {
	machosymtab(ctxt)
	machoDyldInfo(ctxt)

	ldr := ctxt.loader

	// write data that will be linkedit section

	MemBytes int      // size of memory argument in bytes: 1, 2, 4, 8, 16, and so on.
	Len      int      // length of encoded instruction in bytes
	PCRel    int      // length of PC-relative address in instruction encoding
	PCRelOff int      // index of start of PC-relative address in instruction encoding
}

// Prefixes is an array of prefixes associated with a single instruction.
// The prefixes are listed in the same order as found in the instruction:

		{"DysymtabCmd.Iextdefsym", Field, 0},
		{"DysymtabCmd.Ilocalsym", Field, 0},
		{"DysymtabCmd.Indirectsymoff", Field, 0},
		{"DysymtabCmd.Iundefsym", Field, 0},
		{"DysymtabCmd.Len", Field, 0},
		{"DysymtabCmd.Locreloff", Field, 0},
		{"DysymtabCmd.Modtaboff", Field, 0},
		{"DysymtabCmd.Nextdefsym", Field, 0},
		{"DysymtabCmd.Nextrefsyms", Field, 0},
		{"DysymtabCmd.Nextrel", Field, 0},
		{"DysymtabCmd.Nindirectsyms", Field, 0},