forked from ocaml-flambda/flambda-backend
-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy patharm64.S
1317 lines (1221 loc) · 43.8 KB
/
arm64.S
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
/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Gallium, INRIA Rocquencourt */
/* Tom Kelly, OCaml Labs Consultancy, UK */
/* */
/* Copyright 2013 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* Copyright 2022 OCaml Labs Consultancy Ltd. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
/* Asm part of the runtime system, ARM processor, 64-bit mode */
/* Must be preprocessed by cpp */
#include "caml/m.h"
/* Special registers */
#define DOMAIN_STATE_PTR x28
#define TRAP_PTR x26
#define ALLOC_PTR x27
#define ADDITIONAL_ARG x8
#define STACK_ARG_BEGIN x20
#define STACK_ARG_END x21
#define TMP x16
#define TMP2 x17
#define C_ARG_1 x0
#define C_ARG_2 x1
#define C_ARG_3 x2
#define C_ARG_4 x3
/* Support for CFI directives */
#if defined(ASM_CFI_SUPPORTED)
#define CFI_STARTPROC .cfi_startproc
#define CFI_ENDPROC .cfi_endproc
#define CFI_ADJUST(n) .cfi_adjust_cfa_offset n
#define CFI_REGISTER(r1,r2) .cfi_register r1,r2
#define CFI_OFFSET(r,n) .cfi_offset r,n
#define CFI_DEF_CFA_REGISTER(r) .cfi_def_cfa_register r
#define CFI_SIGNAL_FRAME .cfi_signal_frame
#define CFI_REMEMBER_STATE .cfi_remember_state
#define CFI_RESTORE_STATE .cfi_restore_state
#else
#define CFI_STARTPROC
#define CFI_ENDPROC
#define CFI_ADJUST(n)
#define CFI_REGISTER(r1,r2)
#define CFI_OFFSET(r,n)
#define CFI_DEF_CFA_REGISTER(r)
#define CFI_SIGNAL_FRAME
#define CFI_REMEMBER_STATE
#define CFI_RESTORE_STATE
#endif
/* DWARF
These constants are taken from:
DWARF Debugging Information Format, Version 3
http://dwarfstd.org/doc/Dwarf3.pdf
with the ARM64 specific register numbers coming from
Table 4 ("Mapping from DWARF register numbers to Arm
64-bit architecture registers") of:
https://developer.arm.com/documentation/ihi0057/latest
*/
#define DW_CFA_def_cfa_expression 0x0f
#define DW_REG_x21 21
#define DW_REG_sp 31
#define DW_OP_breg 0x70
#define DW_OP_deref 0x06
#define DW_OP_plus_uconst 0x23
.set domain_curr_field, 0
#if defined(SYS_macosx)
#define DOMAIN_STATE(c_type, name) DOMAIN_STATE c_type, name
.macro DOMAIN_STATE c_type, name
.equ domain_field_caml_\name, domain_curr_field
.set domain_curr_field, domain_curr_field + 1
.endm
#else
#define DOMAIN_STATE(c_type, name) \
.equ domain_field_caml_##name, domain_curr_field ; \
.set domain_curr_field, domain_curr_field + 1
#endif
#include "../runtime/caml/domain_state.tbl"
#undef DOMAIN_STATE
#define Caml_state(var) [DOMAIN_STATE_PTR, 8*domain_field_caml_##var]
/* Globals and labels */
#if defined(SYS_macosx)
#define G(sym) _##sym
#define L(lbl) L##lbl
#else
#define G(sym) sym
#define L(lbl) .L##lbl
#endif
#if defined(SYS_macosx)
#define ADDRGLOBAL(reg,symb) ADDRGLOBAL reg, symb
.macro ADDRGLOBAL reg, symb
adrp TMP2, G(\symb)@GOTPAGE
ldr \reg, [TMP2, G(\symb)@GOTPAGEOFF]
.endm
#elif defined(__PIC__)
#define ADDRGLOBAL(reg,symb) \
adrp TMP2, :got:G(symb); \
ldr reg, [TMP2, #:got_lo12:G(symb)]
#else
#define ADDRGLOBAL(reg,symb) \
adrp reg, G(symb); \
add reg, reg, #:lo12:G(symb)
#endif
#if defined(FUNCTION_SECTIONS)
#define TEXT_SECTION(name) .section .text.caml.##name,"ax",%progbits
#else
#define TEXT_SECTION(name)
#endif
#if defined(FUNCTION_SECTIONS)
TEXT_SECTION(caml_hot.code_begin)
.globl G(caml_hot.code_begin)
.globl G(caml_hot__code_begin)
G(caml_hot.code_begin):
G(caml_hot__code_begin):
TEXT_SECTION(caml_hot.code_end)
.globl G(caml_hot.code_end)
.globl G(caml_hot__code_end)
G(caml_hot.code_end):
G(caml_hot__code_end):
#endif
#if defined(SYS_macosx)
#define FUNCTION(name) FUNCTION name
.macro FUNCTION name
TEXT_SECTION(G(\name))
.align 2
.globl G(\name)
G(\name):
.endm
#define END_FUNCTION(name)
#define OBJECT(name) OBJECT name
.macro OBJECT name
.data
.align 3
.globl G(\name)
G(\name):
.endm
#define END_OBJECT(name)
#else
#define FUNCTION(name) \
TEXT_SECTION(name); \
.align 2; \
.globl G(name); \
.type G(name), %function; \
G(name):
#define END_FUNCTION(name) \
.size G(name), .-G(name)
#define OBJECT(name) \
.data; \
.align 3; \
.globl G(name); \
.type G(name), %object; \
G(name):
#define END_OBJECT(name) \
.size G(name), .-G(name)
#endif
/* Stack switching operations */
/* struct stack_info */
#define Stack_sp(reg) [reg]
#define Stack_sp_offset 0
#define Stack_exception(reg) [reg, #8]
#define Stack_handler(reg) [reg, #16]
#define Stack_handler_from_cont(reg) [reg, #15]
/* struct c_stack_link */
#define Cstack_stack(reg) [reg]
#define Cstack_sp(reg) [reg, #8]
#define Cstack_sp_offset 8
#define Cstack_prev(reg) [reg, #16]
#define Cstack_async_exn_handler(reg) [reg, #24]
/* struct stack_handler */
#define Handler_value(reg) [reg]
#define Handler_exception(reg) [reg, #8]
#define Handler_effect(reg) [reg, #16]
#define Handler_parent(reg) [reg, #24]
#define Handler_parent_offset 24
/* Switch from OCaml to C stack. */
.macro SWITCH_OCAML_TO_C
/* Fill in Caml_state->current_stack->sp */
ldr TMP, Caml_state(current_stack)
mov TMP2, sp
str TMP2, Stack_sp(TMP)
/* Fill in Caml_state->c_stack */
ldr TMP2, Caml_state(c_stack)
str TMP, Cstack_stack(TMP2)
mov TMP, sp
str TMP, Cstack_sp(TMP2)
/* Switch to C stack */
mov sp, TMP2
#ifdef ASM_CFI_SUPPORTED
CFI_REMEMBER_STATE
/* sp points to the c_stack_link. */
.cfi_escape DW_CFA_def_cfa_expression, 5, \
DW_OP_breg + DW_REG_sp, Cstack_sp_offset, DW_OP_deref, \
DW_OP_plus_uconst, 16 /* fp + retaddr */
#endif
.endm
/* Switch from C to OCaml stack. */
.macro SWITCH_C_TO_OCAML
ldr TMP, Cstack_sp(sp)
mov sp, TMP
CFI_RESTORE_STATE
.endm
/* Save all of the registers that may be in use to a free gc_regs bucket
and store ALLOC_PTR and TRAP_PTR back to Caml_state
At the end the saved registers are placed in Caml_state(gc_regs)
*/
.macro SAVE_ALL_REGS
/* First, save the young_ptr & exn_handler */
str ALLOC_PTR, Caml_state(young_ptr)
str TRAP_PTR, Caml_state(exn_handler)
/* Now, use TMP to point to the gc_regs bucket */
ldr TMP, Caml_state(gc_regs_buckets)
ldr TMP2, [TMP, 0] /* next ptr */
str TMP2, Caml_state(gc_regs_buckets)
/* Save allocatable registers */
stp x0, x1, [TMP, 16]
stp x2, x3, [TMP, 32]
stp x4, x5, [TMP, 48]
stp x6, x7, [TMP, 64]
stp x8, x9, [TMP, 80]
stp x10, x11, [TMP, 96]
stp x12, x13, [TMP, 112]
stp x14, x15, [TMP, 128]
stp x19, x20, [TMP, 144]
stp x21, x22, [TMP, 160]
stp x23, x24, [TMP, 176]
str x25, [TMP, 192]
/* Save caller-save floating-point registers
(callee-saves are preserved by C functions) */
stp d0, d1, [TMP, 208]
stp d2, d3, [TMP, 224]
stp d4, d5, [TMP, 240]
stp d6, d7, [TMP, 256]
stp d16, d17, [TMP, 272]
stp d18, d19, [TMP, 288]
stp d20, d21, [TMP, 304]
stp d22, d23, [TMP, 320]
stp d24, d25, [TMP, 336]
stp d26, d27, [TMP, 352]
stp d28, d29, [TMP, 368]
stp d30, d31, [TMP, 384]
add TMP, TMP, #16
str TMP, Caml_state(gc_regs)
.endm
/* Undo SAVE_ALL_REGS by loading the registers saved in Caml_state(gc_regs)
and refreshing ALLOC_PTR & TRAP_PTR from Caml_state */
.macro RESTORE_ALL_REGS
/* Restore x0, x1, freeing up the next ptr slot */
ldr TMP, Caml_state(gc_regs)
sub TMP, TMP, #16
/* Restore registers */
ldp x0, x1, [TMP, 16]
ldp x2, x3, [TMP, 32]
ldp x4, x5, [TMP, 48]
ldp x6, x7, [TMP, 64]
ldp x8, x9, [TMP, 80]
ldp x10, x11, [TMP, 96]
ldp x12, x13, [TMP, 112]
ldp x14, x15, [TMP, 128]
ldp x19, x20, [TMP, 144]
ldp x21, x22, [TMP, 160]
ldp x23, x24, [TMP, 176]
ldr x25, [TMP, 192]
ldp d0, d1, [TMP, 208]
ldp d2, d3, [TMP, 224]
ldp d4, d5, [TMP, 240]
ldp d6, d7, [TMP, 256]
ldp d16, d17, [TMP, 272]
ldp d18, d19, [TMP, 288]
ldp d20, d21, [TMP, 304]
ldp d22, d23, [TMP, 320]
ldp d24, d25, [TMP, 336]
ldp d26, d27, [TMP, 352]
ldp d28, d29, [TMP, 368]
ldp d30, d31, [TMP, 384]
/* Put gc_regs struct back in bucket linked list */
ldr TMP2, Caml_state(gc_regs_buckets)
str TMP2, [TMP, 0] /* next ptr */
str TMP, Caml_state(gc_regs_buckets)
/* Reload new allocation pointer & exn handler */
ldr ALLOC_PTR, Caml_state(young_ptr)
ldr TRAP_PTR, Caml_state(exn_handler)
.endm
#if defined(WITH_THREAD_SANITIZER) /* { */
/* Push the current value of the link register to the stack. */
.macro TSAN_SETUP_C_CALL
CFI_OFFSET(30, -16)
str x30, [sp, -16]!
CFI_ADJUST(16)
.endm
/* Restore the value of the link register from the stack. */
.macro TSAN_CLEANUP_AFTER_C_CALL
ldr x30, [sp], 16
CFI_ADJUST(-16)
.endm
/* Invoke a C function, switching back and forth the OCaml and C stacks. */
.macro TSAN_C_CALL fun
SWITCH_OCAML_TO_C
TSAN_SETUP_C_CALL
bl \fun
TSAN_CLEANUP_AFTER_C_CALL
SWITCH_C_TO_OCAML
.endm
/* Invoke __tsan_func_entry(return address in the caller) */
.macro TSAN_ENTER_FUNCTION
mov x0, x30 /* arg1: return address in caller */
TSAN_C_CALL G(__tsan_func_entry)
.endm
/* Invoke __tsan_func_exit(0) */
.macro TSAN_EXIT_FUNCTION
mov x0, xzr
TSAN_C_CALL G(__tsan_func_exit)
.endm
/* This is similar to SAVE_ALL_REGS, but only saving the caller-saved
registers. */
.macro TSAN_SAVE_CALLER_REGS
/* First, save the young_ptr & exn_handler */
str ALLOC_PTR, Caml_state(young_ptr)
str TRAP_PTR, Caml_state(exn_handler)
/* Now, use TMP to point to the gc_regs bucket */
ldr TMP, Caml_state(gc_regs_buckets)
ldr TMP2, [TMP, 0] /* next ptr */
str TMP2, Caml_state(gc_regs_buckets)
/* Save caller-saved registers */
stp x0, x1, [TMP, 16]
stp x2, x3, [TMP, 32]
stp x4, x5, [TMP, 48]
stp x6, x7, [TMP, 64]
stp x8, x9, [TMP, 80]
stp x10, x11, [TMP, 96]
stp x12, x13, [TMP, 112]
stp x14, x15, [TMP, 128]
/* Save caller-save floating-point registers */
stp d0, d1, [TMP, 208]
stp d2, d3, [TMP, 224]
stp d4, d5, [TMP, 240]
stp d6, d7, [TMP, 256]
stp d16, d17, [TMP, 272]
stp d18, d19, [TMP, 288]
stp d20, d21, [TMP, 304]
stp d22, d23, [TMP, 320]
stp d24, d25, [TMP, 336]
stp d26, d27, [TMP, 352]
stp d28, d29, [TMP, 368]
stp d30, d31, [TMP, 384]
add TMP, TMP, #16
str TMP, Caml_state(gc_regs)
.endm
/* This is similar to RESTORE_ALL_REGS, but only restoring the caller-saved
registers. */
.macro TSAN_RESTORE_CALLER_REGS
/* Restore x0, x1, freeing up the next ptr slot */
ldr TMP, Caml_state(gc_regs)
sub TMP, TMP, #16
/* Restore registers */
ldp x0, x1, [TMP, 16]
ldp x2, x3, [TMP, 32]
ldp x4, x5, [TMP, 48]
ldp x6, x7, [TMP, 64]
ldp x8, x9, [TMP, 80]
ldp x10, x11, [TMP, 96]
ldp x12, x13, [TMP, 112]
ldp x14, x15, [TMP, 128]
ldp d0, d1, [TMP, 208]
ldp d2, d3, [TMP, 224]
ldp d4, d5, [TMP, 240]
ldp d6, d7, [TMP, 256]
ldp d16, d17, [TMP, 272]
ldp d18, d19, [TMP, 288]
ldp d20, d21, [TMP, 304]
ldp d22, d23, [TMP, 320]
ldp d24, d25, [TMP, 336]
ldp d26, d27, [TMP, 352]
ldp d28, d29, [TMP, 368]
ldp d30, d31, [TMP, 384]
/* Put gc_regs struct back in bucket linked list */
ldr TMP2, Caml_state(gc_regs_buckets)
str TMP2, [TMP, 0] /* next ptr */
str TMP, Caml_state(gc_regs_buckets)
/* Reload new allocation pointer & exn handler */
ldr ALLOC_PTR, Caml_state(young_ptr)
ldr TRAP_PTR, Caml_state(exn_handler)
.endm
#else /* } { */
.macro TSAN_ENTER_FUNCTION
.endm
.macro TSAN_EXIT_FUNCTION
.endm
.macro TSAN_SAVE_CALLER_REGS
.endm
.macro TSAN_RESTORE_CALLER_REGS
.endm
#endif /* } WITH_THREAD_SANITIZER */
/* Allocation functions and GC interface */
TEXT_SECTION(caml_system__code_begin)
.globl G(caml_system__code_begin)
G(caml_system__code_begin):
FUNCTION(caml_call_realloc_stack)
CFI_STARTPROC
CFI_SIGNAL_FRAME
/* Save return address and frame pointer */
CFI_OFFSET(29, -16)
CFI_OFFSET(30, -8)
stp x29, x30, [sp, -16]!
CFI_ADJUST(16)
add x29, sp, #0
/* Save all registers (including ALLOC_PTR & TRAP_PTR) */
SAVE_ALL_REGS
ldr C_ARG_1, [sp, 16] /* argument */
SWITCH_OCAML_TO_C
bl G(caml_try_realloc_stack)
SWITCH_C_TO_OCAML
cbz x0, 1f
RESTORE_ALL_REGS
/* Free stack space and return to caller */
ldp x29, x30, [sp], 16
ret
1: RESTORE_ALL_REGS
/* Raise the Stack_overflow exception */
ldp x29, x30, [sp], 16
add sp, sp, 16 /* pop argument */
ADDRGLOBAL(x0, caml_exn_Stack_overflow)
b G(caml_raise_async)
CFI_ENDPROC
END_FUNCTION(caml_call_realloc_stack)
FUNCTION(caml_call_gc)
CFI_STARTPROC
L(caml_call_gc):
CFI_SIGNAL_FRAME
/* Save return address and frame pointer */
CFI_OFFSET(29, -16)
CFI_OFFSET(30, -8)
stp x29, x30, [sp, -16]!
CFI_ADJUST(16)
add x29, sp, #0
/* Store all registers (including ALLOC_PTR & TRAP_PTR) */
SAVE_ALL_REGS
TSAN_ENTER_FUNCTION
SWITCH_OCAML_TO_C
/* Call the garbage collector */
bl G(caml_garbage_collection)
SWITCH_C_TO_OCAML
TSAN_EXIT_FUNCTION
RESTORE_ALL_REGS
/* Free stack space and return to caller */
ldp x29, x30, [sp], 16
ret
CFI_ENDPROC
END_FUNCTION(caml_call_gc)
FUNCTION(caml_alloc1)
CFI_STARTPROC
ldr TMP, Caml_state(young_limit)
sub ALLOC_PTR, ALLOC_PTR, #16
cmp ALLOC_PTR, TMP
b.lo L(caml_call_gc)
ret
CFI_ENDPROC
END_FUNCTION(caml_alloc1)
FUNCTION(caml_alloc2)
CFI_STARTPROC
ldr TMP, Caml_state(young_limit)
sub ALLOC_PTR, ALLOC_PTR, #24
cmp ALLOC_PTR, TMP
b.lo L(caml_call_gc)
ret
CFI_ENDPROC
END_FUNCTION(caml_alloc2)
FUNCTION(caml_alloc3)
CFI_STARTPROC
ldr TMP, Caml_state(young_limit)
sub ALLOC_PTR, ALLOC_PTR, #32
cmp ALLOC_PTR, TMP
b.lo L(caml_call_gc)
ret
CFI_ENDPROC
END_FUNCTION(caml_alloc3)
FUNCTION(caml_allocN)
CFI_STARTPROC
ldr TMP, Caml_state(young_limit)
sub ALLOC_PTR, ALLOC_PTR, ADDITIONAL_ARG
cmp ALLOC_PTR, TMP
b.lo L(caml_call_gc)
ret
CFI_ENDPROC
END_FUNCTION(caml_allocN)
/* Reallocate the locals stack. This is like caml_call_gc, above. */
FUNCTION(caml_call_local_realloc)
CFI_STARTPROC
L(caml_call_local_realloc):
/* Save return address and frame pointer */
CFI_OFFSET(29, -16)
CFI_OFFSET(30, -8)
stp x29, x30, [sp, -16]!
CFI_ADJUST(16)
add x29, sp, #0
/* Store all registers (including ALLOC_PTR & TRAP_PTR) */
SAVE_ALL_REGS
SWITCH_OCAML_TO_C
/* Call the runtime to reallocate the local stack */
bl G(caml_local_realloc)
SWITCH_C_TO_OCAML
RESTORE_ALL_REGS
/* Free stack space and return to caller */
ldp x29, x30, [sp], 16
ret
CFI_ENDPROC
END_FUNCTION(caml_call_gc)
/* Call a C function from OCaml */
/* Function to call is in ADDITIONAL_ARG */
.macro RET_FROM_C_CALL
ldr TMP, Caml_state(action_pending)
cbnz TMP, 1f
ret
1: mov TMP, #-1
str TMP, Caml_state(young_limit)
ret
.endm
FUNCTION(caml_c_call)
CFI_STARTPROC
CFI_SIGNAL_FRAME
CFI_OFFSET(29, -16)
CFI_OFFSET(30, -8)
stp x29, x30, [sp, -16]!
CFI_ADJUST(16)
add x29, sp, #0
TSAN_SAVE_CALLER_REGS
TSAN_ENTER_FUNCTION
TSAN_RESTORE_CALLER_REGS
/* Switch from OCaml to C */
SWITCH_OCAML_TO_C
/* Make the exception handler alloc ptr available to the C code */
str ALLOC_PTR, Caml_state(young_ptr)
str TRAP_PTR, Caml_state(exn_handler)
/* Call the function */
blr ADDITIONAL_ARG
/* Reload new allocation pointer & exn handler */
ldr ALLOC_PTR, Caml_state(young_ptr)
ldr TRAP_PTR, Caml_state(exn_handler)
/* Load ocaml stack */
SWITCH_C_TO_OCAML
#if defined(WITH_THREAD_SANITIZER)
/* Save return value registers. Since the called function could be
anything, it may have returned its result (if any) either in x0
or d0:d1. */
stp x0, x1, [sp, -16]!
CFI_ADJUST(16)
stp d0, d1, [sp, -16]!
CFI_ADJUST(16)
TSAN_EXIT_FUNCTION
/* Restore return value registers */
ldp d0, d1, [sp], 16
CFI_ADJUST(-16)
ldp x0, x1, [sp], 16
CFI_ADJUST(-16)
#endif
/* Return */
ldp x29, x30, [sp], 16
RET_FROM_C_CALL
CFI_ENDPROC
END_FUNCTION(caml_c_call)
FUNCTION(caml_c_call_stack_args)
CFI_STARTPROC
CFI_SIGNAL_FRAME
/* Arguments:
C arguments : x0 to x7, d0 to d7
C function : ADDITIONAL_ARG
C stack args : begin=STACK_ARG_BEGIN
end=STACK_ARG_END */
CFI_OFFSET(29, -16)
CFI_OFFSET(30, -8)
stp x29, x30, [sp, -16]!
CFI_ADJUST(16)
add x29, sp, #0
/* Switch from OCaml to C */
SWITCH_OCAML_TO_C
/* Make the exception handler alloc ptr available to the C code */
str ALLOC_PTR, Caml_state(young_ptr)
str TRAP_PTR, Caml_state(exn_handler)
/* Store sp to restore after call */
mov x19, sp
/* Copy arguments from OCaml to C stack
NB: STACK_ARG_{BEGIN,END} are 16-byte aligned */
1: sub STACK_ARG_END, STACK_ARG_END, 16
cmp STACK_ARG_END, STACK_ARG_BEGIN
b.lo 2f
ldp TMP, TMP2, [STACK_ARG_END]
stp TMP, TMP2, [sp, -16]!; CFI_ADJUST(16)
b 1b
2: /* Call the function */
blr ADDITIONAL_ARG
/* Restore stack */
mov sp, x19
/* Reload new allocation pointer & exn handler */
ldr ALLOC_PTR, Caml_state(young_ptr)
ldr TRAP_PTR, Caml_state(exn_handler)
/* Switch from C to OCaml */
SWITCH_C_TO_OCAML
/* Return */
ldp x29, x30, [sp], 16
RET_FROM_C_CALL
CFI_ENDPROC
END_FUNCTION(caml_c_call_stack_args)
/* Start the OCaml program */
FUNCTION(caml_start_program)
CFI_STARTPROC
CFI_SIGNAL_FRAME
#if defined(WITH_THREAD_SANITIZER)
str x0, [sp, -16]!
CFI_ADJUST(16)
/* We can't use the TSAN_ENTER_FUNCTION macro, as it assumes to run on an
OCaml stack, and we are still on a C stack at this point. */
mov x0, x30 /* arg1: return address in caller */
TSAN_SETUP_C_CALL
bl G(__tsan_func_entry)
TSAN_CLEANUP_AFTER_C_CALL
ldr x0, [sp], 16
CFI_ADJUST(-16)
#endif
/* domain state is passed as arg from C */
mov TMP, C_ARG_1
/* Initial entry point is caml_program */
ADDRGLOBAL(TMP2, caml_program)
/* Code shared with caml_callback* */
/* Address of domain state is in TMP */
/* Address of OCaml code to call is in TMP2 */
/* Arguments to the OCaml code are in x0...x7 */
L(jump_to_caml):
/* Set up stack frame and save callee-save registers */
stp x29, x30, [sp, -160]!
CFI_ADJUST(160)
CFI_OFFSET(29, 0)
CFI_OFFSET(30, 8)
add x29, sp, #0
stp x19, x20, [sp, 16]
stp x21, x22, [sp, 32]
stp x23, x24, [sp, 48]
stp x25, x26, [sp, 64]
stp x27, x28, [sp, 80]
stp d8, d9, [sp, 96]
stp d10, d11, [sp, 112]
stp d12, d13, [sp, 128]
stp d14, d15, [sp, 144]
/* Load domain state pointer from argument */
mov DOMAIN_STATE_PTR, TMP
/* Reload allocation pointer */
ldr ALLOC_PTR, Caml_state(young_ptr)
/* Build (16-byte aligned) struct c_stack_link on the C stack */
ldr x8, Caml_state(c_stack)
ldr x9, Caml_state(async_exn_handler)
stp x8, x9, [sp, -16]!
/* C_stack_prev, C_stack_async_exn_handler */
CFI_ADJUST(16)
stp xzr, xzr, [sp, -16]! /* C_stack_stack, C_stack_sp */
CFI_ADJUST(16)
mov x8, sp
str x8, Caml_state(c_stack)
/* Load the OCaml stack */
ldr x8, Caml_state(current_stack)
ldr x8, Stack_sp(x8)
/* Store the gc_regs for callbacks during a GC */
ldr x9, Caml_state(gc_regs)
str x9, [x8, -8]!
/* Store the stack pointer to allow DWARF unwind */
mov x9, sp
str x9, [x8, -8]! /* C_stack_sp */
/* Setup a trap frame to catch exceptions escaping the OCaml code */
ldr x9, Caml_state(exn_handler)
adr x10, L(trap_handler)
stp x9, x10, [x8, -16]!
mov TRAP_PTR, x8
/* Note that the async exception handler chain always goes through
Caml_state, unlike the normal exception handler chain, which goes
through the TRAP_PTR register. */
str x8, Caml_state(async_exn_handler)
/* Switch stacks and call the OCaml code */
mov sp, x8
#ifdef ASM_CFI_SUPPORTED
CFI_REMEMBER_STATE
.cfi_escape DW_CFA_def_cfa_expression, 3 + 2 + 2, \
/* sp points to the exn handler on the OCaml stack */ \
/* sp + 16 contains the C_STACK_SP */ \
DW_OP_breg + DW_REG_sp, 16 /* exn handler */, DW_OP_deref, \
/* 32 struct c_stack_link + pad */ \
/* 18*8 callee save regs */ \
/* 16 fp + ret addr */ \
/* need to split to get under 127 limit */ \
DW_OP_plus_uconst, 96, DW_OP_plus_uconst, 96
#endif
/* Call the OCaml code */
blr TMP2
L(caml_retaddr):
/* Pop the trap frame, restoring Caml_state->exn_handler */
ldr x8, [sp], 16
CFI_ADJUST(-16)
str x8, Caml_state(exn_handler)
L(return_result):
/* restore GC regs */
ldp x8, x9, [sp], 16
CFI_ADJUST(-16)
str x9, Caml_state(gc_regs)
/* Update allocation pointer */
str ALLOC_PTR, Caml_state(young_ptr)
/* Return to C stack */
ldr x8, Caml_state(current_stack)
mov x9, sp
str x9, Stack_sp(x8)
ldr x9, Caml_state(c_stack)
mov sp, x9
CFI_RESTORE_STATE
/* Restore saved async exception pointer */
ldr x8, Cstack_async_exn_handler(sp)
str x8, Caml_state(async_exn_handler)
/* Pop the struct c_stack_link */
ldr x8, Cstack_prev(sp)
add sp, sp, 32
CFI_ADJUST(-32)
str x8, Caml_state(c_stack)
#if defined(WITH_THREAD_SANITIZER)
/* We can't use the TSAN_EXIT_FUNCTION macro, as it assumes to run on an
OCaml stack, and we are back to a C stack at this point. */
str x0, [sp, -16]!
CFI_ADJUST(16)
mov x0, xzr
TSAN_SETUP_C_CALL
bl G(__tsan_func_exit)
TSAN_CLEANUP_AFTER_C_CALL
ldr x0, [sp], 16
CFI_ADJUST(-16)
#endif
/* Reload callee-save registers and return address */
ldp x19, x20, [sp, 16]
ldp x21, x22, [sp, 32]
ldp x23, x24, [sp, 48]
ldp x25, x26, [sp, 64]
ldp x27, x28, [sp, 80]
ldp d8, d9, [sp, 96]
ldp d10, d11, [sp, 112]
ldp d12, d13, [sp, 128]
ldp d14, d15, [sp, 144]
ldp x29, x30, [sp], 160
CFI_ADJUST(-160)
/* Return to C caller */
ret
CFI_ENDPROC
END_FUNCTION(caml_start_program)
/* The trap handler */
.align 2
L(trap_handler):
CFI_STARTPROC
/* Save exception pointer */
str TRAP_PTR, Caml_state(exn_handler)
/* Encode exception bucket as an exception result */
orr x0, x0, #2
/* Return it */
b L(return_result)
CFI_ENDPROC
/* Exceptions */
.macro JUMP_TO_TRAP_PTR
/* Cut stack at current trap handler */
mov sp, TRAP_PTR
/* Pop previous handler and jump to it */
ldp TRAP_PTR, TMP, [sp], 16
br TMP
.endm
/* Raise an exception from OCaml */
FUNCTION(caml_raise_exn)
CFI_STARTPROC
/* Test if backtrace is active */
ldr TMP, Caml_state(backtrace_active)
cbnz TMP, 2f
1:
JUMP_TO_TRAP_PTR
2: /* Zero backtrace_pos */
str xzr, Caml_state(backtrace_pos)
L(caml_reraise_exn_stash):
/* Preserve exception bucket in callee-save register x19 */
mov x19, x0
/* Stash the backtrace */
/* arg1: exn bucket, already in x0 */
mov x1, x30 /* arg2: pc of raise */
mov x2, sp /* arg3: sp of raise */
mov x3, TRAP_PTR /* arg4: sp of handler */
/* Switch to C stack */
ldr TMP, Caml_state(c_stack)
mov sp, TMP
bl G(caml_stash_backtrace)
/* Restore exception bucket and raise */
mov x0, x19
b 1b
CFI_ENDPROC
END_FUNCTION(caml_raise_exn)
FUNCTION(caml_reraise_exn)
CFI_STARTPROC
ldr TMP, Caml_state(backtrace_active)
cbnz TMP, L(caml_reraise_exn_stash)
JUMP_TO_TRAP_PTR
CFI_ENDPROC
END_FUNCTION(caml_reraise_exn)
#if defined(WITH_THREAD_SANITIZER)
/* When TSan support is enabled, this routine should be called just before
raising an exception. It calls __tsan_func_exit for every OCaml frame about
to be exited due to the exception.
Takes no arguments, clobbers x0, x1, x2 and potentially all
caller-saved registers of the C calling convention. */
FUNCTION(caml_tsan_exit_on_raise_asm)
CFI_STARTPROC
mov x0, x30 /* arg1: pc of raise */
mov x1, sp /* arg2: sp of raise */
mov x2, TRAP_PTR /* arg3: sp of handler */
TSAN_C_CALL G(caml_tsan_exit_on_raise)
ret
CFI_ENDPROC
END_FUNCTION(caml_tsan_exit_on_raise_asm)
#endif
/* Raise an exception from C */
FUNCTION(caml_raise_exception)
CFI_STARTPROC
/* Load the domain state ptr */
mov DOMAIN_STATE_PTR, C_ARG_1
/* Load the exception bucket */
mov x0, C_ARG_2
/* Reload trap ptr and alloc ptr */
ldr TRAP_PTR, Caml_state(exn_handler)
ldr ALLOC_PTR, Caml_state(young_ptr)
/* Discard the C stack pointer and reset to ocaml stack */
ldr TMP, Caml_state(current_stack)
ldr TMP, Stack_sp(TMP)
mov sp, TMP
#if defined(WITH_THREAD_SANITIZER)
str x0, [sp, -16]! /* preserve exception bucket */
CFI_ADJUST(16)
/* Call __tsan_func_exit for every OCaml stack frame exited due to the
exception */
mov x1, TMP
ldr x0, [x1, 8] /* arg1: pc of raise */
/* This stack address adjustment is required to compensate the
saving of x29 and x30 in SWITCH_OCAML_STACKS, which causes
Stack_sp() to be 16 bytes lower than expected. */
add x1, x1, 16 /* arg2: sp of raise */
mov x2, TRAP_PTR /* arg3: sp of handler */
TSAN_C_CALL G(caml_tsan_exit_on_raise)
ldr x0, [sp], 16
CFI_ADJUST(-16)
#endif
/* Restore frame and link on return to OCaml */
ldp x29, x30, [sp], 16
b G(caml_raise_exn)
CFI_ENDPROC
END_FUNCTION(caml_raise_exception)
/* Callback from C to OCaml */
FUNCTION(caml_callback_asm)
CFI_STARTPROC
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers x0, x1, x2 and x30 before C call */
stp x0, x1, [sp, -16]!
CFI_ADJUST(16)
stp x2, x30, [sp, -16]!
CFI_ADJUST(16)
mov x0, x30 /* return address */
bl G(__tsan_func_entry)
ldp x2, x30, [sp], 16
CFI_ADJUST(-16)
ldp x0, x1, [sp], 16
CFI_ADJUST(-16)
#endif
/* Initial shuffling of arguments */
/* (x0 = Caml_state, x1 = closure, [x2] = first arg) */
mov TMP, x0
ldr x0, [x2] /* x0 = first arg */
/* x1 = closure environment */
ldr TMP2, [x1] /* code pointer */
b L(jump_to_caml)
CFI_ENDPROC
END_FUNCTION(caml_callback_asm)
FUNCTION(caml_callback2_asm)
CFI_STARTPROC
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers x0, x1, x2 and x30 before C call */
stp x0, x1, [sp, -16]!
CFI_ADJUST(16)
stp x2, x30, [sp, -16]!
CFI_ADJUST(16)
mov x0, x30 /* return address */
bl G(__tsan_func_entry)
ldp x2, x30, [sp], 16
CFI_ADJUST(-16)
ldp x0, x1, [sp], 16
CFI_ADJUST(-16)
#endif
/* Initial shuffling of arguments */
/* (x0 = Caml_state, x1 = closure, [x2] = arg1, [x2,8] = arg2) */
mov TMP, x0
mov TMP2, x1
ldp x0, x1, [x2, 0] /* x0 = first arg, x1 = second arg */
mov x2, TMP2 /* x2 = closure environment */
ADDRGLOBAL(TMP2, caml_apply2)
b L(jump_to_caml)
CFI_ENDPROC
END_FUNCTION(caml_callback2_asm)
FUNCTION(caml_callback3_asm)
CFI_STARTPROC
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers x0, x1, x2 and x30 before C call */
stp x0, x1, [sp, -16]!
CFI_ADJUST(16)
stp x2, x30, [sp, -16]!
CFI_ADJUST(16)
mov x0, x30 /* return address */
bl G(__tsan_func_entry)
ldp x2, x30, [sp], 16
CFI_ADJUST(-16)
ldp x0, x1, [sp], 16
CFI_ADJUST(-16)
#endif