summaryrefslogtreecommitdiff
path: root/Build/source/libs/luajit/LuaJIT-src/dynasm/dasm_arm.lua
blob: e2ed922a3c68d6ebf42c47ab5c02914492b5fb60 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
------------------------------------------------------------------------------
-- DynASM ARM module.
--
-- Copyright (C) 2005-2016 Mike Pall. All rights reserved.
-- See dynasm.lua for full copyright notice.
------------------------------------------------------------------------------

-- Module information:
local _info = {
  arch =	"arm",
  description =	"DynASM ARM module",
  version =	"1.4.0",
  vernum =	 10400,
  release =	"2015-10-18",
  author =	"Mike Pall",
  license =	"MIT",
}

-- Exported glue functions for the arch-specific module.
local _M = { _info = _info }

-- Cache library functions.
local type, tonumber, pairs, ipairs = type, tonumber, pairs, ipairs
local assert, setmetatable, rawget = assert, setmetatable, rawget
local _s = string
local sub, format, byte, char = _s.sub, _s.format, _s.byte, _s.char
local match, gmatch, gsub = _s.match, _s.gmatch, _s.gsub
local concat, sort, insert = table.concat, table.sort, table.insert
local bit = bit or require("bit")
local band, shl, shr, sar = bit.band, bit.lshift, bit.rshift, bit.arshift
local ror, tohex = bit.ror, bit.tohex

-- Inherited tables and callbacks.
local g_opt, g_arch
local wline, werror, wfatal, wwarn

-- Action name list.
-- CHECK: Keep this in sync with the C code!
local action_names = {
  "STOP", "SECTION", "ESC", "REL_EXT",
  "ALIGN", "REL_LG", "LABEL_LG",
  "REL_PC", "LABEL_PC", "IMM", "IMM12", "IMM16", "IMML8", "IMML12", "IMMV8",
}

-- Maximum number of section buffer positions for dasm_put().
-- CHECK: Keep this in sync with the C code!
local maxsecpos = 25 -- Keep this low, to avoid excessively long C lines.

-- Action name -> action number.
local map_action = {}
for n,name in ipairs(action_names) do
  map_action[name] = n-1
end

-- Action list buffer.
local actlist = {}

-- Argument list for next dasm_put(). Start with offset 0 into action list.
local actargs = { 0 }

-- Current number of section buffer positions for dasm_put().
local secpos = 1

------------------------------------------------------------------------------

-- Dump action names and numbers.
local function dumpactions(out)
  out:write("DynASM encoding engine action codes:\n")
  for n,name in ipairs(action_names) do
    local num = map_action[name]
    out:write(format("  %-10s %02X  %d\n", name, num, num))
  end
  out:write("\n")
end

-- Write action list buffer as a huge static C array.
local function writeactions(out, name)
  local nn = #actlist
  if nn == 0 then nn = 1; actlist[0] = map_action.STOP end
  out:write("static const unsigned int ", name, "[", nn, "] = {\n")
  for i = 1,nn-1 do
    assert(out:write("0x", tohex(actlist[i]), ",\n"))
  end
  assert(out:write("0x", tohex(actlist[nn]), "\n};\n\n"))
end

------------------------------------------------------------------------------

-- Add word to action list.
local function wputxw(n)
  assert(n >= 0 and n <= 0xffffffff and n % 1 == 0, "word out of range")
  actlist[#actlist+1] = n
end

-- Add action to list with optional arg. Advance buffer pos, too.
local function waction(action, val, a, num)
  local w = assert(map_action[action], "bad action name `"..action.."'")
  wputxw(w * 0x10000 + (val or 0))
  if a then actargs[#actargs+1] = a end
  if a or num then secpos = secpos + (num or 1) end
end

-- Flush action list (intervening C code or buffer pos overflow).
local function wflush(term)
  if #actlist == actargs[1] then return end -- Nothing to flush.
  if not term then waction("STOP") end -- Terminate action list.
  wline(format("dasm_put(Dst, %s);", concat(actargs, ", ")), true)
  actargs = { #actlist } -- Actionlist offset is 1st arg to next dasm_put().
  secpos = 1 -- The actionlist offset occupies a buffer position, too.
end

-- Put escaped word.
local function wputw(n)
  if n <= 0x000fffff then waction("ESC") end
  wputxw(n)
end

-- Reserve position for word.
local function wpos()
  local pos = #actlist+1
  actlist[pos] = ""
  return pos
end

-- Store word to reserved position.
local function wputpos(pos, n)
  assert(n >= 0 and n <= 0xffffffff and n % 1 == 0, "word out of range")
  if n <= 0x000fffff then
    insert(actlist, pos+1, n)
    n = map_action.ESC * 0x10000
  end
  actlist[pos] = n
end

------------------------------------------------------------------------------

-- Global label name -> global label number. With auto assignment on 1st use.
local next_global = 20
local map_global = setmetatable({}, { __index = function(t, name)
  if not match(name, "^[%a_][%w_]*$") then werror("bad global label") end
  local n = next_global
  if n > 2047 then werror("too many global labels") end
  next_global = n + 1
  t[name] = n
  return n
end})

-- Dump global labels.
local function dumpglobals(out, lvl)
  local t = {}
  for name, n in pairs(map_global) do t[n] = name end
  out:write("Global labels:\n")
  for i=20,next_global-1 do
    out:write(format("  %s\n", t[i]))
  end
  out:write("\n")
end

-- Write global label enum.
local function writeglobals(out, prefix)
  local t = {}
  for name, n in pairs(map_global) do t[n] = name end
  out:write("enum {\n")
  for i=20,next_global-1 do
    out:write("  ", prefix, t[i], ",\n")
  end
  out:write("  ", prefix, "_MAX\n};\n")
end

-- Write global label names.
local function writeglobalnames(out, name)
  local t = {}
  for name, n in pairs(map_global) do t[n] = name end
  out:write("static const char *const ", name, "[] = {\n")
  for i=20,next_global-1 do
    out:write("  \"", t[i], "\",\n")
  end
  out:write("  (const char *)0\n};\n")
end

------------------------------------------------------------------------------

-- Extern label name -> extern label number. With auto assignment on 1st use.
local next_extern = 0
local map_extern_ = {}
local map_extern = setmetatable({}, { __index = function(t, name)
  -- No restrictions on the name for now.
  local n = next_extern
  if n > 2047 then werror("too many extern labels") end
  next_extern = n + 1
  t[name] = n
  map_extern_[n] = name
  return n
end})

-- Dump extern labels.
local function dumpexterns(out, lvl)
  out:write("Extern labels:\n")
  for i=0,next_extern-1 do
    out:write(format("  %s\n", map_extern_[i]))
  end
  out:write("\n")
end

-- Write extern label names.
local function writeexternnames(out, name)
  out:write("static const char *const ", name, "[] = {\n")
  for i=0,next_extern-1 do
    out:write("  \"", map_extern_[i], "\",\n")
  end
  out:write("  (const char *)0\n};\n")
end

------------------------------------------------------------------------------

-- Arch-specific maps.

-- Ext. register name -> int. name.
local map_archdef = { sp = "r13", lr = "r14", pc = "r15", }

-- Int. register name -> ext. name.
local map_reg_rev = { r13 = "sp", r14 = "lr", r15 = "pc", }

local map_type = {}		-- Type name -> { ctype, reg }
local ctypenum = 0		-- Type number (for Dt... macros).

-- Reverse defines for registers.
function _M.revdef(s)
  return map_reg_rev[s] or s
end

local map_shift = { lsl = 0, lsr = 1, asr = 2, ror = 3, }

local map_cond = {
  eq = 0, ne = 1, cs = 2, cc = 3, mi = 4, pl = 5, vs = 6, vc = 7,
  hi = 8, ls = 9, ge = 10, lt = 11, gt = 12, le = 13, al = 14,
  hs = 2, lo = 3,
}

------------------------------------------------------------------------------

-- Template strings for ARM instructions.
local map_op = {
  -- Basic data processing instructions.
  and_3 = "e0000000DNPs",
  eor_3 = "e0200000DNPs",
  sub_3 = "e0400000DNPs",
  rsb_3 = "e0600000DNPs",
  add_3 = "e0800000DNPs",
  adc_3 = "e0a00000DNPs",
  sbc_3 = "e0c00000DNPs",
  rsc_3 = "e0e00000DNPs",
  tst_2 = "e1100000NP",
  teq_2 = "e1300000NP",
  cmp_2 = "e1500000NP",
  cmn_2 = "e1700000NP",
  orr_3 = "e1800000DNPs",
  mov_2 = "e1a00000DPs",
  bic_3 = "e1c00000DNPs",
  mvn_2 = "e1e00000DPs",

  and_4 = "e0000000DNMps",
  eor_4 = "e0200000DNMps",
  sub_4 = "e0400000DNMps",
  rsb_4 = "e0600000DNMps",
  add_4 = "e0800000DNMps",
  adc_4 = "e0a00000DNMps",
  sbc_4 = "e0c00000DNMps",
  rsc_4 = "e0e00000DNMps",
  tst_3 = "e1100000NMp",
  teq_3 = "e1300000NMp",
  cmp_3 = "e1500000NMp",
  cmn_3 = "e1700000NMp",
  orr_4 = "e1800000DNMps",
  mov_3 = "e1a00000DMps",
  bic_4 = "e1c00000DNMps",
  mvn_3 = "e1e00000DMps",

  lsl_3 = "e1a00000DMws",
  lsr_3 = "e1a00020DMws",
  asr_3 = "e1a00040DMws",
  ror_3 = "e1a00060DMws",
  rrx_2 = "e1a00060DMs",

  -- Multiply and multiply-accumulate.
  mul_3 = "e0000090NMSs",
  mla_4 = "e0200090NMSDs",
  umaal_4 = "e0400090DNMSs",	-- v6
  mls_4 = "e0600090DNMSs",	-- v6T2
  umull_4 = "e0800090DNMSs",
  umlal_4 = "e0a00090DNMSs",
  smull_4 = "e0c00090DNMSs",
  smlal_4 = "e0e00090DNMSs",

  -- Halfword multiply and multiply-accumulate.
  smlabb_4 = "e1000080NMSD",	-- v5TE
  smlatb_4 = "e10000a0NMSD",	-- v5TE
  smlabt_4 = "e10000c0NMSD",	-- v5TE
  smlatt_4 = "e10000e0NMSD",	-- v5TE
  smlawb_4 = "e1200080NMSD",	-- v5TE
  smulwb_3 = "e12000a0NMS",	-- v5TE
  smlawt_4 = "e12000c0NMSD",	-- v5TE
  smulwt_3 = "e12000e0NMS",	-- v5TE
  smlalbb_4 = "e1400080NMSD",	-- v5TE
  smlaltb_4 = "e14000a0NMSD",	-- v5TE
  smlalbt_4 = "e14000c0NMSD",	-- v5TE
  smlaltt_4 = "e14000e0NMSD",	-- v5TE
  smulbb_3 = "e1600080NMS",	-- v5TE
  smultb_3 = "e16000a0NMS",	-- v5TE
  smulbt_3 = "e16000c0NMS",	-- v5TE
  smultt_3 = "e16000e0NMS",	-- v5TE

  -- Miscellaneous data processing instructions.
  clz_2 = "e16f0f10DM", -- v5T
  rev_2 = "e6bf0f30DM", -- v6
  rev16_2 = "e6bf0fb0DM", -- v6
  revsh_2 = "e6ff0fb0DM", -- v6
  sel_3 = "e6800fb0DNM", -- v6
  usad8_3 = "e780f010NMS", -- v6
  usada8_4 = "e7800010NMSD", -- v6
  rbit_2 = "e6ff0f30DM", -- v6T2
  movw_2 = "e3000000DW", -- v6T2
  movt_2 = "e3400000DW", -- v6T2
  -- Note: the X encodes width-1, not width.
  sbfx_4 = "e7a00050DMvX", -- v6T2
  ubfx_4 = "e7e00050DMvX", -- v6T2
  -- Note: the X encodes the msb field, not the width.
  bfc_3 = "e7c0001fDvX", -- v6T2
  bfi_4 = "e7c00010DMvX", -- v6T2

  -- Packing and unpacking instructions.
  pkhbt_3 = "e6800010DNM", pkhbt_4 = "e6800010DNMv", -- v6
  pkhtb_3 = "e6800050DNM", pkhtb_4 = "e6800050DNMv", -- v6
  sxtab_3 = "e6a00070DNM", sxtab_4 = "e6a00070DNMv", -- v6
  sxtab16_3 = "e6800070DNM", sxtab16_4 = "e6800070DNMv", -- v6
  sxtah_3 = "e6b00070DNM", sxtah_4 = "e6b00070DNMv", -- v6
  sxtb_2 = "e6af0070DM", sxtb_3 = "e6af0070DMv", -- v6
  sxtb16_2 = "e68f0070DM", sxtb16_3 = "e68f0070DMv", -- v6
  sxth_2 = "e6bf0070DM", sxth_3 = "e6bf0070DMv", -- v6
  uxtab_3 = "e6e00070DNM", uxtab_4 = "e6e00070DNMv", -- v6
  uxtab16_3 = "e6c00070DNM", uxtab16_4 = "e6c00070DNMv", -- v6
  uxtah_3 = "e6f00070DNM", uxtah_4 = "e6f00070DNMv", -- v6
  uxtb_2 = "e6ef0070DM", uxtb_3 = "e6ef0070DMv", -- v6
  uxtb16_2 = "e6cf0070DM", uxtb16_3 = "e6cf0070DMv", -- v6
  uxth_2 = "e6ff0070DM", uxth_3 = "e6ff0070DMv", -- v6

  -- Saturating instructions.
  qadd_3 = "e1000050DMN",	-- v5TE
  qsub_3 = "e1200050DMN",	-- v5TE
  qdadd_3 = "e1400050DMN",	-- v5TE
  qdsub_3 = "e1600050DMN",	-- v5TE
  -- Note: the X for ssat* encodes sat_imm-1, not sat_imm.
  ssat_3 = "e6a00010DXM", ssat_4 = "e6a00010DXMp", -- v6
  usat_3 = "e6e00010DXM", usat_4 = "e6e00010DXMp", -- v6
  ssat16_3 = "e6a00f30DXM", -- v6
  usat16_3 = "e6e00f30DXM", -- v6

  -- Parallel addition and subtraction.
  sadd16_3 = "e6100f10DNM", -- v6
  sasx_3 = "e6100f30DNM", -- v6
  ssax_3 = "e6100f50DNM", -- v6
  ssub16_3 = "e6100f70DNM", -- v6
  sadd8_3 = "e6100f90DNM", -- v6
  ssub8_3 = "e6100ff0DNM", -- v6
  qadd16_3 = "e6200f10DNM", -- v6
  qasx_3 = "e6200f30DNM", -- v6
  qsax_3 = "e6200f50DNM", -- v6
  qsub16_3 = "e6200f70DNM", -- v6
  qadd8_3 = "e6200f90DNM", -- v6
  qsub8_3 = "e6200ff0DNM", -- v6
  shadd16_3 = "e6300f10DNM", -- v6
  shasx_3 = "e6300f30DNM", -- v6
  shsax_3 = "e6300f50DNM", -- v6
  shsub16_3 = "e6300f70DNM", -- v6
  shadd8_3 = "e6300f90DNM", -- v6
  shsub8_3 = "e6300ff0DNM", -- v6
  uadd16_3 = "e6500f10DNM", -- v6
  uasx_3 = "e6500f30DNM", -- v6
  usax_3 = "e6500f50DNM", -- v6
  usub16_3 = "e6500f70DNM", -- v6
  uadd8_3 = "e6500f90DNM", -- v6
  usub8_3 = "e6500ff0DNM", -- v6
  uqadd16_3 = "e6600f10DNM", -- v6
  uqasx_3 = "e6600f30DNM", -- v6
  uqsax_3 = "e6600f50DNM", -- v6
  uqsub16_3 = "e6600f70DNM", -- v6
  uqadd8_3 = "e6600f90DNM", -- v6
  uqsub8_3 = "e6600ff0DNM", -- v6
  uhadd16_3 = "e6700f10DNM", -- v6
  uhasx_3 = "e6700f30DNM", -- v6
  uhsax_3 = "e6700f50DNM", -- v6
  uhsub16_3 = "e6700f70DNM", -- v6
  uhadd8_3 = "e6700f90DNM", -- v6
  uhsub8_3 = "e6700ff0DNM", -- v6

  -- Load/store instructions.
  str_2 = "e4000000DL", str_3 = "e4000000DL", str_4 = "e4000000DL",
  strb_2 = "e4400000DL", strb_3 = "e4400000DL", strb_4 = "e4400000DL",
  ldr_2 = "e4100000DL", ldr_3 = "e4100000DL", ldr_4 = "e4100000DL",
  ldrb_2 = "e4500000DL", ldrb_3 = "e4500000DL", ldrb_4 = "e4500000DL",
  strh_2 = "e00000b0DL", strh_3 = "e00000b0DL",
  ldrh_2 = "e01000b0DL", ldrh_3 = "e01000b0DL",
  ldrd_2 = "e00000d0DL", ldrd_3 = "e00000d0DL", -- v5TE
  ldrsb_2 = "e01000d0DL", ldrsb_3 = "e01000d0DL",
  strd_2 = "e00000f0DL", strd_3 = "e00000f0DL", -- v5TE
  ldrsh_2 = "e01000f0DL", ldrsh_3 = "e01000f0DL",

  ldm_2 = "e8900000oR", ldmia_2 = "e8900000oR", ldmfd_2 = "e8900000oR",
  ldmda_2 = "e8100000oR", ldmfa_2 = "e8100000oR",
  ldmdb_2 = "e9100000oR", ldmea_2 = "e9100000oR",
  ldmib_2 = "e9900000oR", ldmed_2 = "e9900000oR",
  stm_2 = "e8800000oR", stmia_2 = "e8800000oR", stmfd_2 = "e8800000oR",
  stmda_2 = "e8000000oR", stmfa_2 = "e8000000oR",
  stmdb_2 = "e9000000oR", stmea_2 = "e9000000oR",
  stmib_2 = "e9800000oR", stmed_2 = "e9800000oR",
  pop_1 = "e8bd0000R", push_1 = "e92d0000R",

  -- Branch instructions.
  b_1 = "ea000000B",
  bl_1 = "eb000000B",
  blx_1 = "e12fff30C",
  bx_1 = "e12fff10M",

  -- Miscellaneous instructions.
  nop_0 = "e1a00000",
  mrs_1 = "e10f0000D",
  bkpt_1 = "e1200070K", -- v5T
  svc_1 = "ef000000T", swi_1 = "ef000000T",
  ud_0 = "e7f001f0",

  -- VFP instructions.
  ["vadd.f32_3"] = "ee300a00dnm",
  ["vadd.f64_3"] = "ee300b00Gdnm",
  ["vsub.f32_3"] = "ee300a40dnm",
  ["vsub.f64_3"] = "ee300b40Gdnm",
  ["vmul.f32_3"] = "ee200a00dnm",
  ["vmul.f64_3"] = "ee200b00Gdnm",
  ["vnmul.f32_3"] = "ee200a40dnm",
  ["vnmul.f64_3"] = "ee200b40Gdnm",
  ["vmla.f32_3"] = "ee000a00dnm",
  ["vmla.f64_3"] = "ee000b00Gdnm",
  ["vmls.f32_3"] = "ee000a40dnm",
  ["vmls.f64_3"] = "ee000b40Gdnm",
  ["vnmla.f32_3"] = "ee100a40dnm",
  ["vnmla.f64_3"] = "ee100b40Gdnm",
  ["vnmls.f32_3"] = "ee100a00dnm",
  ["vnmls.f64_3"] = "ee100b00Gdnm",
  ["vdiv.f32_3"] = "ee800a00dnm",
  ["vdiv.f64_3"] = "ee800b00Gdnm",

  ["vabs.f32_2"] = "eeb00ac0dm",
  ["vabs.f64_2"] = "eeb00bc0Gdm",
  ["vneg.f32_2"] = "eeb10a40dm",
  ["vneg.f64_2"] = "eeb10b40Gdm",
  ["vsqrt.f32_2"] = "eeb10ac0dm",
  ["vsqrt.f64_2"] = "eeb10bc0Gdm",
  ["vcmp.f32_2"] = "eeb40a40dm",
  ["vcmp.f64_2"] = "eeb40b40Gdm",
  ["vcmpe.f32_2"] = "eeb40ac0dm",
  ["vcmpe.f64_2"] = "eeb40bc0Gdm",
  ["vcmpz.f32_1"] = "eeb50a40d",
  ["vcmpz.f64_1"] = "eeb50b40Gd",
  ["vcmpze.f32_1"] = "eeb50ac0d",
  ["vcmpze.f64_1"] = "eeb50bc0Gd",

  vldr_2 = "ed100a00dl|ed100b00Gdl",
  vstr_2 = "ed000a00dl|ed000b00Gdl",
  vldm_2 = "ec900a00or",
  vldmia_2 = "ec900a00or",
  vldmdb_2 = "ed100a00or",
  vpop_1 = "ecbd0a00r",
  vstm_2 = "ec800a00or",
  vstmia_2 = "ec800a00or",
  vstmdb_2 = "ed000a00or",
  vpush_1 = "ed2d0a00r",

  ["vmov.f32_2"] = "eeb00a40dm|eeb00a00dY",	-- #imm is VFPv3 only
  ["vmov.f64_2"] = "eeb00b40Gdm|eeb00b00GdY",	-- #imm is VFPv3 only
  vmov_2 = "ee100a10Dn|ee000a10nD",
  vmov_3 = "ec500a10DNm|ec400a10mDN|ec500b10GDNm|ec400b10GmDN",

  vmrs_0 = "eef1fa10",
  vmrs_1 = "eef10a10D",
  vmsr_1 = "eee10a10D",

  ["vcvt.s32.f32_2"] = "eebd0ac0dm",
  ["vcvt.s32.f64_2"] = "eebd0bc0dGm",
  ["vcvt.u32.f32_2"] = "eebc0ac0dm",
  ["vcvt.u32.f64_2"] = "eebc0bc0dGm",
  ["vcvtr.s32.f32_2"] = "eebd0a40dm",
  ["vcvtr.s32.f64_2"] = "eebd0b40dGm",
  ["vcvtr.u32.f32_2"] = "eebc0a40dm",
  ["vcvtr.u32.f64_2"] = "eebc0b40dGm",
  ["vcvt.f32.s32_2"] = "eeb80ac0dm",
  ["vcvt.f64.s32_2"] = "eeb80bc0GdFm",
  ["vcvt.f32.u32_2"] = "eeb80a40dm",
  ["vcvt.f64.u32_2"] = "eeb80b40GdFm",
  ["vcvt.f32.f64_2"] = "eeb70bc0dGm",
  ["vcvt.f64.f32_2"] = "eeb70ac0GdFm",

  -- VFPv4 only:
  ["vfma.f32_3"] = "eea00a00dnm",
  ["vfma.f64_3"] = "eea00b00Gdnm",
  ["vfms.f32_3"] = "eea00a40dnm",
  ["vfms.f64_3"] = "eea00b40Gdnm",
  ["vfnma.f32_3"] = "ee900a40dnm",
  ["vfnma.f64_3"] = "ee900b40Gdnm",
  ["vfnms.f32_3"] = "ee900a00dnm",
  ["vfnms.f64_3"] = "ee900b00Gdnm",

  -- NYI: Advanced SIMD instructions.

  -- NYI: I have no need for these instructions right now:
  -- swp, swpb, strex, ldrex, strexd, ldrexd, strexb, ldrexb, strexh, ldrexh
  -- msr, nopv6, yield, wfe, wfi, sev, dbg, bxj, smc, srs, rfe
  -- cps, setend, pli, pld, pldw, clrex, dsb, dmb, isb
  -- stc, ldc, mcr, mcr2, mrc, mrc2, mcrr, mcrr2, mrrc, mrrc2, cdp, cdp2
}

-- Add mnemonics for "s" variants.
do
  local t = {}
  for k,v in pairs(map_op) do
    if sub(v, -1) == "s" then
      local v2 = sub(v, 1, 2)..char(byte(v, 3)+1)..sub(v, 4, -2)
      t[sub(k, 1, -3).."s"..sub(k, -2)] = v2
    end
  end
  for k,v in pairs(t) do
    map_op[k] = v
  end
end

------------------------------------------------------------------------------

local function parse_gpr(expr)
  local tname, ovreg = match(expr, "^([%w_]+):(r1?[0-9])$")
  local tp = map_type[tname or expr]
  if tp then
    local reg = ovreg or tp.reg
    if not reg then
      werror("type `"..(tname or expr).."' needs a register override")
    end
    expr = reg
  end
  local r = match(expr, "^r(1?[0-9])$")
  if r then
    r = tonumber(r)
    if r <= 15 then return r, tp end
  end
  werror("bad register name `"..expr.."'")
end

local function parse_gpr_pm(expr)
  local pm, expr2 = match(expr, "^([+-]?)(.*)$")
  return parse_gpr(expr2), (pm == "-")
end

local function parse_vr(expr, tp)
  local t, r = match(expr, "^([sd])([0-9]+)$")
  if t == tp then
    r = tonumber(r)
    if r <= 31 then
      if t == "s" then return shr(r, 1), band(r, 1) end
      return band(r, 15), shr(r, 4)
    end
  end
  werror("bad register name `"..expr.."'")
end

local function parse_reglist(reglist)
  reglist = match(reglist, "^{%s*([^}]*)}$")
  if not reglist then werror("register list expected") end
  local rr = 0
  for p in gmatch(reglist..",", "%s*([^,]*),") do
    local rbit = shl(1, parse_gpr(gsub(p, "%s+$", "")))
    if band(rr, rbit) ~= 0 then
      werror("duplicate register `"..p.."'")
    end
    rr = rr + rbit
  end
  return rr
end

local function parse_vrlist(reglist)
  local ta, ra, tb, rb = match(reglist,
			   "^{%s*([sd])([0-9]+)%s*%-%s*([sd])([0-9]+)%s*}$")
  ra, rb = tonumber(ra), tonumber(rb)
  if ta and ta == tb and ra and rb and ra <= 31 and rb <= 31 and ra <= rb then
    local nr = rb+1 - ra
    if ta == "s" then
      return shl(shr(ra,1),12)+shl(band(ra,1),22) + nr
    else
      return shl(band(ra,15),12)+shl(shr(ra,4),22) + nr*2 + 0x100
    end
  end
  werror("register list expected")
end

local function parse_imm(imm, bits, shift, scale, signed)
  imm = match(imm, "^#(.*)$")
  if not imm then werror("expected immediate operand") end
  local n = tonumber(imm)
  if n then
    local m = sar(n, scale)
    if shl(m, scale) == n then
      if signed then
	local s = sar(m, bits-1)
	if s == 0 then return shl(m, shift)
	elseif s == -1 then return shl(m + shl(1, bits), shift) end
      else
	if sar(m, bits) == 0 then return shl(m, shift) end
      end
    end
    werror("out of range immediate `"..imm.."'")
  else
    waction("IMM", (signed and 32768 or 0)+scale*1024+bits*32+shift, imm)
    return 0
  end
end

local function parse_imm12(imm)
  local n = tonumber(imm)
  if n then
    local m = band(n)
    for i=0,-15,-1 do
      if shr(m, 8) == 0 then return m + shl(band(i, 15), 8) end
      m = ror(m, 2)
    end
    werror("out of range immediate `"..imm.."'")
  else
    waction("IMM12", 0, imm)
    return 0
  end
end

local function parse_imm16(imm)
  imm = match(imm, "^#(.*)$")
  if not imm then werror("expected immediate operand") end
  local n = tonumber(imm)
  if n then
    if shr(n, 16) == 0 then return band(n, 0x0fff) + shl(band(n, 0xf000), 4) end
    werror("out of range immediate `"..imm.."'")
  else
    waction("IMM16", 32*16, imm)
    return 0
  end
end

local function parse_imm_load(imm, ext)
  local n = tonumber(imm)
  if n then
    if ext then
      if n >= -255 and n <= 255 then
	local up = 0x00800000
	if n < 0 then n = -n; up = 0 end
	return shl(band(n, 0xf0), 4) + band(n, 0x0f) + up
      end
    else
      if n >= -4095 and n <= 4095 then
	if n >= 0 then return n+0x00800000 end
	return -n
      end
    end
    werror("out of range immediate `"..imm.."'")
  else
    waction(ext and "IMML8" or "IMML12", 32768 + shl(ext and 8 or 12, 5), imm)
    return 0
  end
end

local function parse_shift(shift, gprok)
  if shift == "rrx" then
    return 3 * 32
  else
    local s, s2 = match(shift, "^(%S+)%s*(.*)$")
    s = map_shift[s]
    if not s then werror("expected shift operand") end
    if sub(s2, 1, 1) == "#" then
      return parse_imm(s2, 5, 7, 0, false) + shl(s, 5)
    else
      if not gprok then werror("expected immediate shift operand") end
      return shl(parse_gpr(s2), 8) + shl(s, 5) + 16
    end
  end
end

local function parse_label(label, def)
  local prefix = sub(label, 1, 2)
  -- =>label (pc label reference)
  if prefix == "=>" then
    return "PC", 0, sub(label, 3)
  end
  -- ->name (global label reference)
  if prefix == "->" then
    return "LG", map_global[sub(label, 3)]
  end
  if def then
    -- [1-9] (local label definition)
    if match(label, "^[1-9]$") then
      return "LG", 10+tonumber(label)
    end
  else
    -- [<>][1-9] (local label reference)
    local dir, lnum = match(label, "^([<>])([1-9])$")
    if dir then -- Fwd: 1-9, Bkwd: 11-19.
      return "LG", lnum + (dir == ">" and 0 or 10)
    end
    -- extern label (extern label reference)
    local extname = match(label, "^extern%s+(%S+)$")
    if extname then
      return "EXT", map_extern[extname]
    end
  end
  werror("bad label `"..label.."'")
end

local function parse_load(params, nparams, n, op)
  local oplo = band(op, 255)
  local ext, ldrd = (oplo ~= 0), (oplo == 208)
  local d
  if (ldrd or oplo == 240) then
    d = band(shr(op, 12), 15)
    if band(d, 1) ~= 0 then werror("odd destination register") end
  end
  local pn = params[n]
  local p1, wb = match(pn, "^%[%s*(.-)%s*%](!?)$")
  local p2 = params[n+1]
  if not p1 then
    if not p2 then
      if match(pn, "^[<>=%-]") or match(pn, "^extern%s+") then
	local mode, n, s = parse_label(pn, false)
	waction("REL_"..mode, n + (ext and 0x1800 or 0x0800), s, 1)
	return op + 15 * 65536 + 0x01000000 + (ext and 0x00400000 or 0)
      end
      local reg, tailr = match(pn, "^([%w_:]+)%s*(.*)$")
      if reg and tailr ~= "" then
	local d, tp = parse_gpr(reg)
	if tp then
	  waction(ext and "IMML8" or "IMML12", 32768 + 32*(ext and 8 or 12),
		  format(tp.ctypefmt, tailr))
	  return op + shl(d, 16) + 0x01000000 + (ext and 0x00400000 or 0)
	end
      end
    end
    werror("expected address operand")
  end
  if wb == "!" then op = op + 0x00200000 end
  if p2 then
    if wb == "!" then werror("bad use of '!'") end
    local p3 = params[n+2]
    op = op + shl(parse_gpr(p1), 16)
    local imm = match(p2, "^#(.*)$")
    if imm then
      local m = parse_imm_load(imm, ext)
      if p3 then werror("too many parameters") end
      op = op + m + (ext and 0x00400000 or 0)
    else
      local m, neg = parse_gpr_pm(p2)
      if ldrd and (m == d or m-1 == d) then werror("register conflict") end
      op = op + m + (neg and 0 or 0x00800000) + (ext and 0 or 0x02000000)
      if p3 then op = op + parse_shift(p3) end
    end
  else
    local p1a, p2 = match(p1, "^([^,%s]*)%s*(.*)$")
    op = op + shl(parse_gpr(p1a), 16) + 0x01000000
    if p2 ~= "" then
      local imm = match(p2, "^,%s*#(.*)$")
      if imm then
	local m = parse_imm_load(imm, ext)
	op = op + m + (ext and 0x00400000 or 0)
      else
	local p2a, p3 = match(p2, "^,%s*([^,%s]*)%s*,?%s*(.*)$")
	local m, neg = parse_gpr_pm(p2a)
	if ldrd and (m == d or m-1 == d) then werror("register conflict") end
	op = op + m + (neg and 0 or 0x00800000) + (ext and 0 or 0x02000000)
	if p3 ~= "" then
	  if ext then werror("too many parameters") end
	  op = op + parse_shift(p3)
	end
      end
    else
      if wb == "!" then werror("bad use of '!'") end
      op = op + (ext and 0x00c00000 or 0x00800000)
    end
  end
  return op
end

local function parse_vload(q)
  local reg, imm = match(q, "^%[%s*([^,%s]*)%s*(.*)%]$")
  if reg then
    local d = shl(parse_gpr(reg), 16)
    if imm == "" then return d end
    imm = match(imm, "^,%s*#(.*)$")
    if imm then
      local n = tonumber(imm)
      if n then
	if n >= -1020 and n <= 1020 and n%4 == 0 then
	  return d + (n >= 0 and n/4+0x00800000 or -n/4)
	end
	werror("out of range immediate `"..imm.."'")
      else
	waction("IMMV8", 32768 + 32*8, imm)
	return d
      end
    end
  else
    if match(q, "^[<>=%-]") or match(q, "^extern%s+") then
      local mode, n, s = parse_label(q, false)
      waction("REL_"..mode, n + 0x2800, s, 1)
      return 15 * 65536
    end
    local reg, tailr = match(q, "^([%w_:]+)%s*(.*)$")
    if reg and tailr ~= "" then
      local d, tp = parse_gpr(reg)
      if tp then
	waction("IMMV8", 32768 + 32*8, format(tp.ctypefmt, tailr))
	return shl(d, 16)
      end
    end
  end
  werror("expected address operand")
end

------------------------------------------------------------------------------

-- Handle opcodes defined with template strings.
local function parse_template(params, template, nparams, pos)
  local op = tonumber(sub(template, 1, 8), 16)
  local n = 1
  local vr = "s"

  -- Process each character.
  for p in gmatch(sub(template, 9), ".") do
    local q = params[n]
    if p == "D" then
      op = op + shl(parse_gpr(q), 12); n = n + 1
    elseif p == "N" then
      op = op + shl(parse_gpr(q), 16); n = n + 1
    elseif p == "S" then
      op = op + shl(parse_gpr(q), 8); n = n + 1
    elseif p == "M" then
      op = op + parse_gpr(q); n = n + 1
    elseif p == "d" then
      local r,h = parse_vr(q, vr); op = op+shl(r,12)+shl(h,22); n = n + 1
    elseif p == "n" then
      local r,h = parse_vr(q, vr); op = op+shl(r,16)+shl(h,7); n = n + 1
    elseif p == "m" then
      local r,h = parse_vr(q, vr); op = op+r+shl(h,5); n = n + 1
    elseif p == "P" then
      local imm = match(q, "^#(.*)$")
      if imm then
	op = op + parse_imm12(imm) + 0x02000000
      else
	op = op + parse_gpr(q)
      end
      n = n + 1
    elseif p == "p" then
      op = op + parse_shift(q, true); n = n + 1
    elseif p == "L" then
      op = parse_load(params, nparams, n, op)
    elseif p == "l" then
      op = op + parse_vload(q)
    elseif p == "B" then
      local mode, n, s = parse_label(q, false)
      waction("REL_"..mode, n, s, 1)
    elseif p == "C" then -- blx gpr vs. blx label.
      if match(q, "^([%w_]+):(r1?[0-9])$") or match(q, "^r(1?[0-9])$") then
	op = op + parse_gpr(q)
      else
	if op < 0xe0000000 then werror("unconditional instruction") end
	local mode, n, s = parse_label(q, false)
	waction("REL_"..mode, n, s, 1)
	op = 0xfa000000
      end
    elseif p == "F" then
      vr = "s"
    elseif p == "G" then
      vr = "d"
    elseif p == "o" then
      local r, wb = match(q, "^([^!]*)(!?)$")
      op = op + shl(parse_gpr(r), 16) + (wb == "!" and 0x00200000 or 0)
      n = n + 1
    elseif p == "R" then
      op = op + parse_reglist(q); n = n + 1
    elseif p == "r" then
      op = op + parse_vrlist(q); n = n + 1
    elseif p == "W" then
      op = op + parse_imm16(q); n = n + 1
    elseif p == "v" then
      op = op + parse_imm(q, 5, 7, 0, false); n = n + 1
    elseif p == "w" then
      local imm = match(q, "^#(.*)$")
      if imm then
	op = op + parse_imm(q, 5, 7, 0, false); n = n + 1
      else
	op = op + shl(parse_gpr(q), 8) + 16
      end
    elseif p == "X" then
      op = op + parse_imm(q, 5, 16, 0, false); n = n + 1
    elseif p == "Y" then
      local imm = tonumber(match(q, "^#(.*)$")); n = n + 1
      if not imm or shr(imm, 8) ~= 0 then
	werror("bad immediate operand")
      end
      op = op + shl(band(imm, 0xf0), 12) + band(imm, 0x0f)
    elseif p == "K" then
      local imm = tonumber(match(q, "^#(.*)$")); n = n + 1
      if not imm or shr(imm, 16) ~= 0 then
	werror("bad immediate operand")
      end
      op = op + shl(band(imm, 0xfff0), 4) + band(imm, 0x000f)
    elseif p == "T" then
      op = op + parse_imm(q, 24, 0, 0, false); n = n + 1
    elseif p == "s" then
      -- Ignored.
    else
      assert(false)
    end
  end
  wputpos(pos, op)
end

map_op[".template__"] = function(params, template, nparams)
  if not params then return template:gsub("%x%x%x%x%x%x%x%x", "") end

  -- Limit number of section buffer positions used by a single dasm_put().
  -- A single opcode needs a maximum of 3 positions.
  if secpos+3 > maxsecpos then wflush() end
  local pos = wpos()
  local lpos, apos, spos = #actlist, #actargs, secpos

  local ok, err
  for t in gmatch(template, "[^|]+") do
    ok, err = pcall(parse_template, params, t, nparams, pos)
    if ok then return end
    secpos = spos
    actlist[lpos+1] = nil
    actlist[lpos+2] = nil
    actlist[lpos+3] = nil
    actargs[apos+1] = nil
    actargs[apos+2] = nil
    actargs[apos+3] = nil
  end
  error(err, 0)
end

------------------------------------------------------------------------------

-- Pseudo-opcode to mark the position where the action list is to be emitted.
map_op[".actionlist_1"] = function(params)
  if not params then return "cvar" end
  local name = params[1] -- No syntax check. You get to keep the pieces.
  wline(function(out) writeactions(out, name) end)
end

-- Pseudo-opcode to mark the position where the global enum is to be emitted.
map_op[".globals_1"] = function(params)
  if not params then return "prefix" end
  local prefix = params[1] -- No syntax check. You get to keep the pieces.
  wline(function(out) writeglobals(out, prefix) end)
end

-- Pseudo-opcode to mark the position where the global names are to be emitted.
map_op[".globalnames_1"] = function(params)
  if not params then return "cvar" end
  local name = params[1] -- No syntax check. You get to keep the pieces.
  wline(function(out) writeglobalnames(out, name) end)
end

-- Pseudo-opcode to mark the position where the extern names are to be emitted.
map_op[".externnames_1"] = function(params)
  if not params then return "cvar" end
  local name = params[1] -- No syntax check. You get to keep the pieces.
  wline(function(out) writeexternnames(out, name) end)
end

------------------------------------------------------------------------------

-- Label pseudo-opcode (converted from trailing colon form).
map_op[".label_1"] = function(params)
  if not params then return "[1-9] | ->global | =>pcexpr" end
  if secpos+1 > maxsecpos then wflush() end
  local mode, n, s = parse_label(params[1], true)
  if mode == "EXT" then werror("bad label definition") end
  waction("LABEL_"..mode, n, s, 1)
end

------------------------------------------------------------------------------

-- Pseudo-opcodes for data storage.
map_op[".long_*"] = function(params)
  if not params then return "imm..." end
  for _,p in ipairs(params) do
    local n = tonumber(p)
    if not n then werror("bad immediate `"..p.."'") end
    if n < 0 then n = n + 2^32 end
    wputw(n)
    if secpos+2 > maxsecpos then wflush() end
  end
end

-- Alignment pseudo-opcode.
map_op[".align_1"] = function(params)
  if not params then return "numpow2" end
  if secpos+1 > maxsecpos then wflush() end
  local align = tonumber(params[1])
  if align then
    local x = align
    -- Must be a power of 2 in the range (2 ... 256).
    for i=1,8 do
      x = x / 2
      if x == 1 then
	waction("ALIGN", align-1, nil, 1) -- Action byte is 2**n-1.
	return
      end
    end
  end
  werror("bad alignment")
end

------------------------------------------------------------------------------

-- Pseudo-opcode for (primitive) type definitions (map to C types).
map_op[".type_3"] = function(params, nparams)
  if not params then
    return nparams == 2 and "name, ctype" or "name, ctype, reg"
  end
  local name, ctype, reg = params[1], params[2], params[3]
  if not match(name, "^[%a_][%w_]*$") then
    werror("bad type name `"..name.."'")
  end
  local tp = map_type[name]
  if tp then
    werror("duplicate type `"..name.."'")
  end
  -- Add #type to defines. A bit unclean to put it in map_archdef.
  map_archdef["#"..name] = "sizeof("..ctype..")"
  -- Add new type and emit shortcut define.
  local num = ctypenum + 1
  map_type[name] = {
    ctype = ctype,
    ctypefmt = format("Dt%X(%%s)", num),
    reg = reg,
  }
  wline(format("#define Dt%X(_V) (int)(ptrdiff_t)&(((%s *)0)_V)", num, ctype))
  ctypenum = num
end
map_op[".type_2"] = map_op[".type_3"]

-- Dump type definitions.
local function dumptypes(out, lvl)
  local t = {}
  for name in pairs(map_type) do t[#t+1] = name end
  sort(t)
  out:write("Type definitions:\n")
  for _,name in ipairs(t) do
    local tp = map_type[name]
    local reg = tp.reg or ""
    out:write(format("  %-20s %-20s %s\n", name, tp.ctype, reg))
  end
  out:write("\n")
end

------------------------------------------------------------------------------

-- Set the current section.
function _M.section(num)
  waction("SECTION", num)
  wflush(true) -- SECTION is a terminal action.
end

------------------------------------------------------------------------------

-- Dump architecture description.
function _M.dumparch(out)
  out:write(format("DynASM %s version %s, released %s\n\n",
    _info.arch, _info.version, _info.release))
  dumpactions(out)
end

-- Dump all user defined elements.
function _M.dumpdef(out, lvl)
  dumptypes(out, lvl)
  dumpglobals(out, lvl)
  dumpexterns(out, lvl)
end

------------------------------------------------------------------------------

-- Pass callbacks from/to the DynASM core.
function _M.passcb(wl, we, wf, ww)
  wline, werror, wfatal, wwarn = wl, we, wf, ww
  return wflush
end

-- Setup the arch-specific module.
function _M.setup(arch, opt)
  g_arch, g_opt = arch, opt
end

-- Merge the core maps and the arch-specific maps.
function _M.mergemaps(map_coreop, map_def)
  setmetatable(map_op, { __index = function(t, k)
    local v = map_coreop[k]
    if v then return v end
    local k1, cc, k2 = match(k, "^(.-)(..)([._].*)$")
    local cv = map_cond[cc]
    if cv then
      local v = rawget(t, k1..k2)
      if type(v) == "string" then
	local scv = format("%x", cv)
	return gsub(scv..sub(v, 2), "|e", "|"..scv)
      end
    end
  end })
  setmetatable(map_def, { __index = map_archdef })
  return map_op, map_def
end

return _M

------------------------------------------------------------------------------