This file is indexed.

/usr/src/gcc-8/debian/patches/libffi-riscv.diff is in gcc-8-source 8-20180414-1ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
# DP: Backport RISC-V support, taken from libffi commit 3840d49aaa

Index: b/src/libffi/Makefile.am
===================================================================
--- a/src/libffi/Makefile.am
+++ b/src/libffi/Makefile.am
@@ -138,6 +138,7 @@ noinst_HEADERS = \
 	src/or1k/ffitarget.h						\
 	src/pa/ffitarget.h						\
 	src/powerpc/ffitarget.h src/powerpc/asm.h src/powerpc/ffi_powerpc.h \
+	src/riscv/ffitarget.h						\
 	src/s390/ffitarget.h						\
 	src/sh/ffitarget.h						\
 	src/sh64/ffitarget.h						\
@@ -173,6 +174,7 @@ EXTRA_libffi_la_SOURCES = \
 	 src/powerpc/linux64_closure.S src/powerpc/ppc_closure.S	\
 	 src/powerpc/aix.S src/powerpc/darwin.S src/powerpc/aix_closure.S \
 	 src/powerpc/darwin_closure.S src/powerpc/ffi_darwin.c		\
+	src/riscv/ffi.c src/riscv/sysv.S				\
 	src/s390/ffi.c src/s390/sysv.S					\
 	src/sh/ffi.c src/sh/sysv.S					\
 	src/sh64/ffi.c src/sh64/sysv.S					\
Index: b/src/libffi/Makefile.in
===================================================================
--- a/src/libffi/Makefile.in
+++ b/src/libffi/Makefile.in
@@ -432,6 +432,7 @@ noinst_HEADERS = \
 	src/or1k/ffitarget.h						\
 	src/pa/ffitarget.h						\
 	src/powerpc/ffitarget.h src/powerpc/asm.h src/powerpc/ffi_powerpc.h \
+	src/riscv/ffitarget.h						\
 	src/s390/ffitarget.h						\
 	src/sh/ffitarget.h						\
 	src/sh64/ffitarget.h						\
@@ -467,6 +468,7 @@ EXTRA_libffi_la_SOURCES = \
 	 src/powerpc/linux64_closure.S src/powerpc/ppc_closure.S	\
 	 src/powerpc/aix.S src/powerpc/darwin.S src/powerpc/aix_closure.S \
 	 src/powerpc/darwin_closure.S src/powerpc/ffi_darwin.c		\
+	src/riscv/ffi.c src/riscv/sysv.S				\
 	src/s390/ffi.c src/s390/sysv.S					\
 	src/sh/ffi.c src/sh/sysv.S					\
 	src/sh64/ffi.c src/sh64/sysv.S					\
@@ -831,6 +833,16 @@ src/powerpc/darwin_closure.lo: src/power
 	src/powerpc/$(DEPDIR)/$(am__dirstamp)
 src/powerpc/ffi_darwin.lo: src/powerpc/$(am__dirstamp) \
 	src/powerpc/$(DEPDIR)/$(am__dirstamp)
+src/riscv/$(am__dirstamp):
+	@$(MKDIR_P) src/riscv
+	@: > src/riscv/$(am__dirstamp)
+src/riscv/$(DEPDIR)/$(am__dirstamp):
+	@$(MKDIR_P) src/riscv/$(DEPDIR)
+	@: > src/riscv/$(DEPDIR)/$(am__dirstamp)
+src/riscv/ffi.lo: src/riscv/$(am__dirstamp) \
+	src/riscv/$(DEPDIR)/$(am__dirstamp)
+src/riscv/sysv.lo: src/riscv/$(am__dirstamp) \
+	src/riscv/$(DEPDIR)/$(am__dirstamp)
 src/s390/$(am__dirstamp):
 	@$(MKDIR_P) src/s390
 	@: > src/s390/$(am__dirstamp)
@@ -1051,6 +1063,10 @@ mostlyclean-compile:
 	-rm -f src/prep_cif.lo
 	-rm -f src/raw_api.$(OBJEXT)
 	-rm -f src/raw_api.lo
+	-rm -f src/riscv/ffi.$(OBJEXT)
+	-rm -f src/riscv/ffi.lo
+	-rm -f src/riscv/sysv.$(OBJEXT)
+	-rm -f src/riscv/sysv.lo
 	-rm -f src/s390/ffi.$(OBJEXT)
 	-rm -f src/s390/ffi.lo
 	-rm -f src/s390/sysv.$(OBJEXT)
@@ -1167,6 +1183,8 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@src/powerpc/$(DEPDIR)/linux64_closure.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@src/powerpc/$(DEPDIR)/ppc_closure.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@src/powerpc/$(DEPDIR)/sysv.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@src/riscv/$(DEPDIR)/ffi.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@src/riscv/$(DEPDIR)/sysv.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@src/s390/$(DEPDIR)/ffi.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@src/s390/$(DEPDIR)/sysv.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@src/sh/$(DEPDIR)/ffi.Plo@am__quote@
@@ -1268,6 +1286,7 @@ clean-libtool:
 	-rm -rf src/or1k/.libs src/or1k/_libs
 	-rm -rf src/pa/.libs src/pa/_libs
 	-rm -rf src/powerpc/.libs src/powerpc/_libs
+	-rm -rf src/riscv/.libs src/riscv/_libs
 	-rm -rf src/s390/.libs src/s390/_libs
 	-rm -rf src/sh/.libs src/sh/_libs
 	-rm -rf src/sh64/.libs src/sh64/_libs
@@ -1672,6 +1691,8 @@ distclean-generic:
 	-rm -f src/pa/$(am__dirstamp)
 	-rm -f src/powerpc/$(DEPDIR)/$(am__dirstamp)
 	-rm -f src/powerpc/$(am__dirstamp)
+	-rm -f src/riscv/$(DEPDIR)/$(am__dirstamp)
+	-rm -f src/riscv/$(am__dirstamp)
 	-rm -f src/s390/$(DEPDIR)/$(am__dirstamp)
 	-rm -f src/s390/$(am__dirstamp)
 	-rm -f src/sh/$(DEPDIR)/$(am__dirstamp)
@@ -1701,7 +1722,7 @@ clean-am: clean-aminfo clean-generic cle
 
 distclean: distclean-multi distclean-recursive
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
-	-rm -rf src/$(DEPDIR) src/aarch64/$(DEPDIR) src/alpha/$(DEPDIR) src/arc/$(DEPDIR) src/arm/$(DEPDIR) src/avr32/$(DEPDIR) src/bfin/$(DEPDIR) src/cris/$(DEPDIR) src/frv/$(DEPDIR) src/ia64/$(DEPDIR) src/m32r/$(DEPDIR) src/m68k/$(DEPDIR) src/m88k/$(DEPDIR) src/metag/$(DEPDIR) src/microblaze/$(DEPDIR) src/mips/$(DEPDIR) src/moxie/$(DEPDIR) src/nios2/$(DEPDIR) src/or1k/$(DEPDIR) src/pa/$(DEPDIR) src/powerpc/$(DEPDIR) src/s390/$(DEPDIR) src/sh/$(DEPDIR) src/sh64/$(DEPDIR) src/sparc/$(DEPDIR) src/tile/$(DEPDIR) src/vax/$(DEPDIR) src/x86/$(DEPDIR) src/xtensa/$(DEPDIR)
+	-rm -rf src/$(DEPDIR) src/aarch64/$(DEPDIR) src/alpha/$(DEPDIR) src/arc/$(DEPDIR) src/arm/$(DEPDIR) src/avr32/$(DEPDIR) src/bfin/$(DEPDIR) src/cris/$(DEPDIR) src/frv/$(DEPDIR) src/ia64/$(DEPDIR) src/m32r/$(DEPDIR) src/m68k/$(DEPDIR) src/m88k/$(DEPDIR) src/metag/$(DEPDIR) src/microblaze/$(DEPDIR) src/mips/$(DEPDIR) src/moxie/$(DEPDIR) src/nios2/$(DEPDIR) src/or1k/$(DEPDIR) src/pa/$(DEPDIR) src/powerpc/$(DEPDIR) src/riscv/$(DEPDIR) src/s390/$(DEPDIR) src/sh/$(DEPDIR) src/sh64/$(DEPDIR) src/sparc/$(DEPDIR) src/tile/$(DEPDIR) src/vax/$(DEPDIR) src/x86/$(DEPDIR) src/xtensa/$(DEPDIR)
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
 	distclean-hdr distclean-libtool distclean-tags
@@ -1840,7 +1861,7 @@ installcheck-am:
 maintainer-clean: maintainer-clean-multi maintainer-clean-recursive
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
 	-rm -rf $(top_srcdir)/autom4te.cache
-	-rm -rf src/$(DEPDIR) src/aarch64/$(DEPDIR) src/alpha/$(DEPDIR) src/arc/$(DEPDIR) src/arm/$(DEPDIR) src/avr32/$(DEPDIR) src/bfin/$(DEPDIR) src/cris/$(DEPDIR) src/frv/$(DEPDIR) src/ia64/$(DEPDIR) src/m32r/$(DEPDIR) src/m68k/$(DEPDIR) src/m88k/$(DEPDIR) src/metag/$(DEPDIR) src/microblaze/$(DEPDIR) src/mips/$(DEPDIR) src/moxie/$(DEPDIR) src/nios2/$(DEPDIR) src/or1k/$(DEPDIR) src/pa/$(DEPDIR) src/powerpc/$(DEPDIR) src/s390/$(DEPDIR) src/sh/$(DEPDIR) src/sh64/$(DEPDIR) src/sparc/$(DEPDIR) src/tile/$(DEPDIR) src/vax/$(DEPDIR) src/x86/$(DEPDIR) src/xtensa/$(DEPDIR)
+	-rm -rf src/$(DEPDIR) src/aarch64/$(DEPDIR) src/alpha/$(DEPDIR) src/arc/$(DEPDIR) src/arm/$(DEPDIR) src/avr32/$(DEPDIR) src/bfin/$(DEPDIR) src/cris/$(DEPDIR) src/frv/$(DEPDIR) src/ia64/$(DEPDIR) src/m32r/$(DEPDIR) src/m68k/$(DEPDIR) src/m88k/$(DEPDIR) src/metag/$(DEPDIR) src/microblaze/$(DEPDIR) src/mips/$(DEPDIR) src/moxie/$(DEPDIR) src/nios2/$(DEPDIR) src/or1k/$(DEPDIR) src/pa/$(DEPDIR) src/powerpc/$(DEPDIR) src/riscv/$(DEPDIR) src/s390/$(DEPDIR) src/sh/$(DEPDIR) src/sh64/$(DEPDIR) src/sparc/$(DEPDIR) src/tile/$(DEPDIR) src/vax/$(DEPDIR) src/x86/$(DEPDIR) src/xtensa/$(DEPDIR)
 	-rm -f Makefile
 maintainer-clean-am: distclean-am maintainer-clean-aminfo \
 	maintainer-clean-generic maintainer-clean-vti
Index: b/src/libffi/configure.host
===================================================================
--- a/src/libffi/configure.host
+++ b/src/libffi/configure.host
@@ -195,6 +195,11 @@ case "${host}" in
 	TARGET=POWERPC; TARGETDIR=powerpc
 	;;
 
+  riscv*-*)
+	TARGET=RISCV; TARGETDIR=riscv
+	SOURCES="ffi.c sysv.S"
+	;;
+
   s390-*-* | s390x-*-*)
 	TARGET=S390; TARGETDIR=s390
 	SOURCES="ffi.c sysv.S"
Index: b/src/libffi/src/riscv/ffi.c
===================================================================
--- /dev/null
+++ b/src/libffi/src/riscv/ffi.c
@@ -0,0 +1,445 @@
+/* -----------------------------------------------------------------------
+   ffi.c - Copyright (c) 2015 Michael Knyszek <mknyszek@berkeley.edu>
+                         2015 Andrew Waterman <waterman@cs.berkeley.edu>
+                         2018 Stef O'Rear <sorear2@gmail.com>
+   Based on MIPS N32/64 port
+
+   RISC-V Foreign Function Interface
+
+   Permission is hereby granted, free of charge, to any person obtaining
+   a copy of this software and associated documentation files (the
+   ``Software''), to deal in the Software without restriction, including
+   without limitation the rights to use, copy, modify, merge, publish,
+   distribute, sublicense, and/or sell copies of the Software, and to
+   permit persons to whom the Software is furnished to do so, subject to
+   the following conditions:
+
+   The above copyright notice and this permission notice shall be included
+   in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+   NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+   DEALINGS IN THE SOFTWARE.
+   ----------------------------------------------------------------------- */
+
+#include <ffi.h>
+#include <ffi_common.h>
+
+#include <stdlib.h>
+#include <stdint.h>
+
+#if __riscv_float_abi_double
+#define ABI_FLEN 64
+#define ABI_FLOAT double
+#elif __riscv_float_abi_single
+#define ABI_FLEN 32
+#define ABI_FLOAT float
+#endif
+
+#define NARGREG 8
+#define STKALIGN 16
+#define MAXCOPYARG (2 * sizeof(double))
+
+typedef struct call_context
+{
+#if ABI_FLEN
+    ABI_FLOAT fa[8];
+#endif
+    size_t a[8];
+    /* used by the assembly code to in-place construct its own stack frame */
+    char frame[16];
+} call_context;
+
+typedef struct call_builder
+{
+    call_context *aregs;
+    int used_integer;
+    int used_float;
+    size_t *used_stack;
+} call_builder;
+
+/* integer (not pointer) less than ABI XLEN */
+/* FFI_TYPE_INT does not appear to be used */
+#if __SIZEOF_POINTER__ == 8
+#define IS_INT(type) ((type) >= FFI_TYPE_UINT8 && (type) <= FFI_TYPE_SINT64)
+#else
+#define IS_INT(type) ((type) >= FFI_TYPE_UINT8 && (type) <= FFI_TYPE_SINT32)
+#endif
+
+#if ABI_FLEN
+typedef struct {
+    char as_elements, type1, offset2, type2;
+} float_struct_info;
+
+#if ABI_FLEN >= 64
+#define IS_FLOAT(type) ((type) >= FFI_TYPE_FLOAT && (type) <= FFI_TYPE_DOUBLE)
+#else
+#define IS_FLOAT(type) ((type) == FFI_TYPE_FLOAT)
+#endif
+
+static ffi_type **flatten_struct(ffi_type *in, ffi_type **out, ffi_type **out_end) {
+    int i;
+    if (out == out_end) return out;
+    if (in->type != FFI_TYPE_STRUCT) {
+        *(out++) = in;
+    } else {
+        for (i = 0; in->elements[i]; i++)
+            out = flatten_struct(in->elements[i], out, out_end);
+    }
+    return out;
+}
+
+/* Structs with at most two fields after flattening, one of which is of
+   floating point type, are passed in multiple registers if sufficient
+   registers are available. */
+static float_struct_info struct_passed_as_elements(call_builder *cb, ffi_type *top) {
+    float_struct_info ret = {0, 0, 0, 0};
+    ffi_type *fields[3];
+    int num_floats, num_ints;
+    int num_fields = flatten_struct(top, fields, fields + 3) - fields;
+
+    if (num_fields == 1) {
+        if (IS_FLOAT(fields[0]->type)) {
+            ret.as_elements = 1;
+            ret.type1 = fields[0]->type;
+        }
+    } else if (num_fields == 2) {
+        num_floats = IS_FLOAT(fields[0]->type) + IS_FLOAT(fields[1]->type);
+        num_ints = IS_INT(fields[0]->type) + IS_INT(fields[1]->type);
+        if (num_floats == 0 || num_floats + num_ints != 2)
+            return ret;
+        if (cb->used_float + num_floats > NARGREG || cb->used_integer + (2 - num_floats) > NARGREG)
+            return ret;
+        if (!IS_FLOAT(fields[0]->type) && !IS_FLOAT(fields[1]->type))
+            return ret;
+
+        ret.type1 = fields[0]->type;
+        ret.type2 = fields[1]->type;
+        ret.offset2 = ALIGN(fields[0]->size, fields[1]->alignment);
+        ret.as_elements = 1;
+    }
+
+    return ret;
+}
+#endif
+
+/* allocates a single register, float register, or XLEN-sized stack slot to a datum */
+static void marshal_atom(call_builder *cb, int type, void *data) {
+    size_t value = 0;
+    switch (type) {
+        case FFI_TYPE_UINT8: value = *(uint8_t *)data; break;
+        case FFI_TYPE_SINT8: value = *(int8_t *)data; break;
+        case FFI_TYPE_UINT16: value = *(uint16_t *)data; break;
+        case FFI_TYPE_SINT16: value = *(int16_t *)data; break;
+        /* 32-bit quantities are always sign-extended in the ABI */
+        case FFI_TYPE_UINT32: value = *(int32_t *)data; break;
+        case FFI_TYPE_SINT32: value = *(int32_t *)data; break;
+#if __SIZEOF_POINTER__ == 8
+        case FFI_TYPE_UINT64: value = *(uint64_t *)data; break;
+        case FFI_TYPE_SINT64: value = *(int64_t *)data; break;
+#endif
+        case FFI_TYPE_POINTER: value = *(size_t *)data; break;
+
+        /* float values may be recoded in an implementation-defined way
+           by hardware conforming to 2.1 or earlier, so use asm to
+           reinterpret floats as doubles */
+#if ABI_FLEN >= 32
+        case FFI_TYPE_FLOAT:
+            asm("" : "=f"(cb->aregs->fa[cb->used_float++]) : "0"(*(float *)data));
+            return;
+#endif
+#if ABI_FLEN >= 64
+        case FFI_TYPE_DOUBLE:
+            asm("" : "=f"(cb->aregs->fa[cb->used_float++]) : "0"(*(double *)data));
+            return;
+#endif
+        default: FFI_ASSERT(0); break;
+    }
+
+    if (cb->used_integer == NARGREG) {
+        *cb->used_stack++ = value;
+    } else {
+        cb->aregs->a[cb->used_integer++] = value;
+    }
+}
+
+static void unmarshal_atom(call_builder *cb, int type, void *data) {
+    size_t value;
+    switch (type) {
+#if ABI_FLEN >= 32
+        case FFI_TYPE_FLOAT:
+            asm("" : "=f"(*(float *)data) : "0"(cb->aregs->fa[cb->used_float++]));
+            return;
+#endif
+#if ABI_FLEN >= 64
+        case FFI_TYPE_DOUBLE:
+            asm("" : "=f"(*(double *)data) : "0"(cb->aregs->fa[cb->used_float++]));
+            return;
+#endif
+    }
+
+    if (cb->used_integer == NARGREG) {
+        value = *cb->used_stack++;
+    } else {
+        value = cb->aregs->a[cb->used_integer++];
+    }
+
+    switch (type) {
+        case FFI_TYPE_UINT8: *(uint8_t *)data = value; break;
+        case FFI_TYPE_SINT8: *(uint8_t *)data = value; break;
+        case FFI_TYPE_UINT16: *(uint16_t *)data = value; break;
+        case FFI_TYPE_SINT16: *(uint16_t *)data = value; break;
+        case FFI_TYPE_UINT32: *(uint32_t *)data = value; break;
+        case FFI_TYPE_SINT32: *(uint32_t *)data = value; break;
+#if __SIZEOF_POINTER__ == 8
+        case FFI_TYPE_UINT64: *(uint64_t *)data = value; break;
+        case FFI_TYPE_SINT64: *(uint64_t *)data = value; break;
+#endif
+        case FFI_TYPE_POINTER: *(size_t *)data = value; break;
+        default: FFI_ASSERT(0); break;
+    }
+}
+
+/* adds an argument to a call, or a not by reference return value */
+static void marshal(call_builder *cb, ffi_type *type, int var, void *data) {
+    size_t realign[2];
+
+#if ABI_FLEN
+    if (!var && type->type == FFI_TYPE_STRUCT) {
+        float_struct_info fsi = struct_passed_as_elements(cb, type);
+        if (fsi.as_elements) {
+            marshal_atom(cb, fsi.type1, data);
+            if (fsi.offset2)
+                marshal_atom(cb, fsi.type2, ((char*)data) + fsi.offset2);
+            return;
+        }
+    }
+
+    if (!var && cb->used_float < NARGREG && IS_FLOAT(type->type)) {
+        marshal_atom(cb, type->type, data);
+        return;
+    }
+#endif
+
+    if (type->size > 2 * __SIZEOF_POINTER__) {
+        /* pass by reference */
+        marshal_atom(cb, FFI_TYPE_POINTER, &data);
+    } else if (IS_INT(type->type) || type->type == FFI_TYPE_POINTER) {
+        marshal_atom(cb, type->type, data);
+    } else {
+        /* overlong integers, soft-float floats, and structs without special
+           float handling are treated identically from this point on */
+
+        /* variadics are aligned even in registers */
+        if (type->alignment > __SIZEOF_POINTER__) {
+            if (var)
+                cb->used_integer = ALIGN(cb->used_integer, 2);
+            cb->used_stack = (size_t *)ALIGN(cb->used_stack, 2*__SIZEOF_POINTER__);
+        }
+
+        memcpy(realign, data, type->size);
+        if (type->size > 0)
+            marshal_atom(cb, FFI_TYPE_POINTER, realign);
+        if (type->size > __SIZEOF_POINTER__)
+            marshal_atom(cb, FFI_TYPE_POINTER, realign + 1);
+    }
+}
+
+/* for arguments passed by reference returns the pointer, otherwise the arg is copied (up to MAXCOPYARG bytes) */
+static void *unmarshal(call_builder *cb, ffi_type *type, int var, void *data) {
+    size_t realign[2];
+    void *pointer;
+
+#if ABI_FLEN
+    if (!var && type->type == FFI_TYPE_STRUCT) {
+        float_struct_info fsi = struct_passed_as_elements(cb, type);
+        if (fsi.as_elements) {
+            unmarshal_atom(cb, fsi.type1, data);
+            if (fsi.offset2)
+                unmarshal_atom(cb, fsi.type2, ((char*)data) + fsi.offset2);
+            return data;
+        }
+    }
+
+    if (!var && cb->used_float < NARGREG && IS_FLOAT(type->type)) {
+        unmarshal_atom(cb, type->type, data);
+        return data;
+    }
+#endif
+
+    if (type->size > 2 * __SIZEOF_POINTER__) {
+        /* pass by reference */
+        unmarshal_atom(cb, FFI_TYPE_POINTER, (char*)&pointer);
+        return pointer;
+    } else if (IS_INT(type->type) || type->type == FFI_TYPE_POINTER) {
+        unmarshal_atom(cb, type->type, data);
+        return data;
+    } else {
+        /* overlong integers, soft-float floats, and structs without special
+           float handling are treated identically from this point on */
+
+        /* variadics are aligned even in registers */
+        if (type->alignment > __SIZEOF_POINTER__) {
+            if (var)
+                cb->used_integer = ALIGN(cb->used_integer, 2);
+            cb->used_stack = (size_t *)ALIGN(cb->used_stack, 2*__SIZEOF_POINTER__);
+        }
+
+        if (type->size > 0)
+            unmarshal_atom(cb, FFI_TYPE_POINTER, realign);
+        if (type->size > __SIZEOF_POINTER__)
+            unmarshal_atom(cb, FFI_TYPE_POINTER, realign + 1);
+        memcpy(data, realign, type->size);
+        return data;
+    }
+}
+
+static int passed_by_ref(call_builder *cb, ffi_type *type, int var) {
+#if ABI_FLEN
+    if (!var && type->type == FFI_TYPE_STRUCT) {
+        float_struct_info fsi = struct_passed_as_elements(cb, type);
+        if (fsi.as_elements) return 0;
+    }
+#endif
+
+    return type->size > 2 * __SIZEOF_POINTER__;
+}
+
+/* Perform machine dependent cif processing */
+ffi_status ffi_prep_cif_machdep(ffi_cif *cif) {
+    cif->riscv_nfixedargs = cif->nargs;
+    return FFI_OK;
+}
+
+/* Perform machine dependent cif processing when we have a variadic function */
+
+ffi_status ffi_prep_cif_machdep_var(ffi_cif *cif, unsigned int nfixedargs, unsigned int ntotalargs) {
+    cif->riscv_nfixedargs = nfixedargs;
+    return FFI_OK;
+}
+
+/* Low level routine for calling functions */
+extern void ffi_call_asm(void *stack, struct call_context *regs, void (*fn)(void)) FFI_HIDDEN;
+
+void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
+{
+    /* this is a conservative estimate, assuming a complex return value and
+       that all remaining arguments are long long / __int128 */
+    size_t arg_bytes = cif->nargs <= 3 ? 0 :
+        ALIGN(2 * sizeof(size_t) * (cif->nargs - 3), STKALIGN);
+    size_t rval_bytes = 0;
+    if (rvalue == NULL && cif->rtype->size > 2*__SIZEOF_POINTER__)
+        rval_bytes = ALIGN(cif->rtype->size, STKALIGN);
+    size_t alloc_size = arg_bytes + rval_bytes + sizeof(call_context);
+
+    /* the assembly code will deallocate all stack data at lower addresses
+       than the argument region, so we need to allocate the frame and the
+       return value after the arguments in a single allocation */
+    size_t alloc_base;
+    /* Argument region must be 16-byte aligned */
+    if (_Alignof(max_align_t) >= STKALIGN) {
+        /* since sizeof long double is normally 16, the compiler will
+           guarantee alloca alignment to at least that much */
+        alloc_base = (size_t)alloca(alloc_size);
+    } else {
+        alloc_base = ALIGN(alloca(alloc_size + STKALIGN - 1), STKALIGN);
+    }
+
+    if (rval_bytes)
+        rvalue = (void*)(alloc_base + arg_bytes);
+
+    call_builder cb;
+    cb.used_float = cb.used_integer = 0;
+    cb.aregs = (call_context*)(alloc_base + arg_bytes + rval_bytes);
+    cb.used_stack = (void*)alloc_base;
+
+    int return_by_ref = passed_by_ref(&cb, cif->rtype, 0);
+    if (return_by_ref)
+        marshal(&cb, &ffi_type_pointer, 0, &rvalue);
+
+    int i;
+    for (i = 0; i < cif->nargs; i++)
+        marshal(&cb, cif->arg_types[i], i >= cif->riscv_nfixedargs, avalue[i]);
+
+    ffi_call_asm((void*)alloc_base, cb.aregs, fn);
+
+    cb.used_float = cb.used_integer = 0;
+    if (!return_by_ref && rvalue)
+        unmarshal(&cb, cif->rtype, 0, rvalue);
+}
+
+extern void ffi_closure_asm(void) FFI_HIDDEN;
+
+ffi_status ffi_prep_closure_loc(ffi_closure *closure, ffi_cif *cif, void (*fun)(ffi_cif*,void*,void**,void*), void *user_data, void *codeloc)
+{
+    uint32_t *tramp = (uint32_t *) &closure->tramp[0];
+    uint64_t fn = (uint64_t) (uintptr_t) ffi_closure_asm;
+
+    if (cif->abi <= FFI_FIRST_ABI || cif->abi >= FFI_LAST_ABI)
+        return FFI_BAD_ABI;
+
+    /* we will call ffi_closure_inner with codeloc, not closure, but as long
+       as the memory is readable it should work */
+
+    tramp[0] = 0x00000317; /* auipc t1, 0 (i.e. t0 <- codeloc) */
+#if __SIZEOF_POINTER__ == 8
+    tramp[1] = 0x01033383; /* ld t2, 16(t1) */
+#else
+    tramp[1] = 0x01032383; /* lw t2, 16(t1) */
+#endif
+    tramp[2] = 0x00038067; /* jr t2 */
+    tramp[3] = 0x00000013; /* nop */
+    tramp[4] = fn;
+    tramp[5] = fn >> 32;
+
+    closure->cif = cif;
+    closure->fun = fun;
+    closure->user_data = user_data;
+
+    __builtin___clear_cache(codeloc, codeloc + FFI_TRAMPOLINE_SIZE);
+
+    return FFI_OK;
+}
+
+/* Called by the assembly code with aregs pointing to saved argument registers
+   and stack pointing to the stacked arguments.  Return values passed in
+   registers will be reloaded from aregs. */
+void FFI_HIDDEN ffi_closure_inner(size_t *stack, call_context *aregs, ffi_closure *closure) {
+    ffi_cif *cif = closure->cif;
+    void **avalue = alloca(cif->nargs * sizeof(void*));
+    /* storage for arguments which will be copied by unmarshal().  We could
+       theoretically avoid the copies in many cases and use at most 128 bytes
+       of memory, but allocating disjoint storage for each argument is
+       simpler. */
+    char *astorage = alloca(cif->nargs * MAXCOPYARG);
+    void *rvalue;
+    call_builder cb;
+    int return_by_ref;
+    int i;
+
+    cb.aregs = aregs;
+    cb.used_integer = cb.used_float = 0;
+    cb.used_stack = stack;
+
+    return_by_ref = passed_by_ref(&cb, cif->rtype, 0);
+    if (return_by_ref)
+        unmarshal(&cb, &ffi_type_pointer, 0, &rvalue);
+    else
+        rvalue = alloca(cif->rtype->size);
+
+    for (i = 0; i < cif->nargs; i++)
+        avalue[i] = unmarshal(&cb, cif->arg_types[i],
+            i >= cif->riscv_nfixedargs, astorage + i*MAXCOPYARG);
+
+    (closure->fun)(cif, rvalue, avalue, closure->user_data);
+
+    if (!return_by_ref && cif->rtype->type != FFI_TYPE_VOID) {
+        cb.used_integer = cb.used_float = 0;
+        marshal(&cb, cif->rtype, 0, rvalue);
+    }
+}
Index: b/src/libffi/src/riscv/ffitarget.h
===================================================================
--- /dev/null
+++ b/src/libffi/src/riscv/ffitarget.h
@@ -0,0 +1,68 @@
+/* -----------------------------------------------------------------*-C-*-
+   ffitarget.h - 2014 Michael Knyszek
+
+   Target configuration macros for RISC-V.
+
+   Permission is hereby granted, free of charge, to any person obtaining
+   a copy of this software and associated documentation files (the
+   ``Software''), to deal in the Software without restriction, including
+   without limitation the rights to use, copy, modify, merge, publish,
+   distribute, sublicense, and/or sell copies of the Software, and to
+   permit persons to whom the Software is furnished to do so, subject to
+   the following conditions:
+
+   The above copyright notice and this permission notice shall be included
+   in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+   NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+   DEALINGS IN THE SOFTWARE.
+
+   ----------------------------------------------------------------------- */
+
+#ifndef LIBFFI_TARGET_H
+#define LIBFFI_TARGET_H
+
+#ifndef LIBFFI_H
+#error "Please do not include ffitarget.h directly into your source.  Use ffi.h instead."
+#endif
+
+#ifndef __riscv
+#error "libffi was configured for a RISC-V target but this does not appear to be a RISC-V compiler."
+#endif
+
+#ifndef LIBFFI_ASM
+
+typedef unsigned long ffi_arg;
+typedef   signed long ffi_sarg;
+
+/* FFI_UNUSED_NN and riscv_unused are to maintain ABI compatibility with a
+   distributed Berkeley patch from 2014, and can be removed at SONAME bump */
+typedef enum ffi_abi {
+    FFI_FIRST_ABI = 0,
+    FFI_SYSV,
+    FFI_UNUSED_1,
+    FFI_UNUSED_2,
+    FFI_UNUSED_3,
+    FFI_LAST_ABI,
+
+    FFI_DEFAULT_ABI = FFI_SYSV
+} ffi_abi;
+
+#endif /* LIBFFI_ASM */
+
+/* ---- Definitions for closures ----------------------------------------- */
+
+#define FFI_CLOSURES 1
+#define FFI_TRAMPOLINE_SIZE 24
+#define FFI_NATIVE_RAW_API 0
+#define FFI_EXTRA_CIF_FIELDS unsigned riscv_nfixedargs; unsigned riscv_unused;
+#define FFI_TARGET_SPECIFIC_VARIADIC
+
+#endif
+
Index: b/src/libffi/src/riscv/sysv.S
===================================================================
--- /dev/null
+++ b/src/libffi/src/riscv/sysv.S
@@ -0,0 +1,214 @@
+/* -----------------------------------------------------------------------
+   ffi.c - Copyright (c) 2015 Michael Knyszek <mknyszek@berkeley.edu>
+                         2015 Andrew Waterman <waterman@cs.berkeley.edu>
+                         2018 Stef O'Rear <sorear2@gmail.com>
+
+   RISC-V Foreign Function Interface
+
+   Permission is hereby granted, free of charge, to any person obtaining
+   a copy of this software and associated documentation files (the
+   ``Software''), to deal in the Software without restriction, including
+   without limitation the rights to use, copy, modify, merge, publish,
+   distribute, sublicense, and/or sell copies of the Software, and to
+   permit persons to whom the Software is furnished to do so, subject to
+   the following conditions:
+
+   The above copyright notice and this permission notice shall be included
+   in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+   NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+   DEALINGS IN THE SOFTWARE.
+   ----------------------------------------------------------------------- */
+
+#define LIBFFI_ASM
+#include <fficonfig.h>
+#include <ffi.h>
+
+/* Define aliases so that we can handle all ABIs uniformly */
+
+#if __SIZEOF_POINTER__ == 8
+#define PTRS 8
+#define LARG ld
+#define SARG sd
+#else
+#define PTRS 4
+#define LARG lw
+#define SARG sw
+#endif
+
+#if __riscv_float_abi_double
+#define FLTS 8
+#define FLARG fld
+#define FSARG fsd
+#elif __riscv_float_abi_single
+#define FLTS 4
+#define FLARG flw
+#define FSARG fsw
+#else
+#define FLTS 0
+#endif
+
+#define fp s0
+
+    .text
+    .globl  ffi_call_asm
+    .type   ffi_call_asm, @function
+    .hidden ffi_call_asm
+/*
+  struct call_context {
+      floatreg fa[8];
+      intreg a[8];
+      intreg pad[rv32 ? 2 : 0];
+      intreg save_fp, save_ra;
+  }
+  void ffi_call_asm(size_t *stackargs, struct call_context *regargs,
+      void (*fn)(void));
+*/
+
+#define FRAME_LEN (8 * FLTS + 8 * PTRS + 16)
+
+ffi_call_asm:
+    .cfi_startproc
+
+    /*
+      We are NOT going to set up an ordinary stack frame.  In order to pass
+      the stacked args to the called function, we adjust our stack pointer to
+      a0, which is in the _caller's_ alloca area.  We establish our own stack
+      frame at the end of the call_context.
+
+      Anything below the arguments will be freed at this point, although we
+      preserve the call_context so that it can be read back in the caller.
+    */
+
+    .cfi_def_cfa 11, FRAME_LEN # interim CFA based on a1
+    SARG    fp, FRAME_LEN - 2*PTRS(a1)
+    .cfi_offset 8, -2*PTRS
+    SARG    ra, FRAME_LEN - 1*PTRS(a1)
+    .cfi_offset 1, -1*PTRS
+
+    addi    fp, a1, FRAME_LEN
+    mv      sp, a0
+    .cfi_def_cfa 8, 0 # our frame is fully set up
+
+    # Load arguments
+    mv      t1, a2
+
+#if FLTS
+    FLARG   fa0, -FRAME_LEN+0*FLTS(fp)
+    FLARG   fa1, -FRAME_LEN+1*FLTS(fp)
+    FLARG   fa2, -FRAME_LEN+2*FLTS(fp)
+    FLARG   fa3, -FRAME_LEN+3*FLTS(fp)
+    FLARG   fa4, -FRAME_LEN+4*FLTS(fp)
+    FLARG   fa5, -FRAME_LEN+5*FLTS(fp)
+    FLARG   fa6, -FRAME_LEN+6*FLTS(fp)
+    FLARG   fa7, -FRAME_LEN+7*FLTS(fp)
+#endif
+
+    LARG    a0, -FRAME_LEN+8*FLTS+0*PTRS(fp)
+    LARG    a1, -FRAME_LEN+8*FLTS+1*PTRS(fp)
+    LARG    a2, -FRAME_LEN+8*FLTS+2*PTRS(fp)
+    LARG    a3, -FRAME_LEN+8*FLTS+3*PTRS(fp)
+    LARG    a4, -FRAME_LEN+8*FLTS+4*PTRS(fp)
+    LARG    a5, -FRAME_LEN+8*FLTS+5*PTRS(fp)
+    LARG    a6, -FRAME_LEN+8*FLTS+6*PTRS(fp)
+    LARG    a7, -FRAME_LEN+8*FLTS+7*PTRS(fp)
+
+    /* Call */
+    jalr    t1
+
+    /* Save return values - only a0/a1 (fa0/fa1) are used */
+#if FLTS
+    FSARG   fa0, -FRAME_LEN+0*FLTS(fp)
+    FSARG   fa1, -FRAME_LEN+1*FLTS(fp)
+#endif
+
+    SARG    a0, -FRAME_LEN+8*FLTS+0*PTRS(fp)
+    SARG    a1, -FRAME_LEN+8*FLTS+1*PTRS(fp)
+
+    /* Restore and return */
+    addi    sp, fp, -FRAME_LEN
+    .cfi_def_cfa 2, FRAME_LEN
+    LARG    ra, -1*PTRS(fp)
+    .cfi_restore 1
+    LARG    fp, -2*PTRS(fp)
+    .cfi_restore 8
+    ret
+    .cfi_endproc
+    .size   ffi_call_asm, .-ffi_call_asm
+
+
+/*
+  ffi_closure_asm. Expects address of the passed-in ffi_closure in t1.
+  void ffi_closure_inner(size_t *stackargs, struct call_context *regargs,
+      ffi_closure *closure);
+*/
+
+    .globl ffi_closure_asm
+    .hidden ffi_closure_asm
+    .type ffi_closure_asm, @function
+ffi_closure_asm:
+    .cfi_startproc
+
+    addi    sp,  sp, -FRAME_LEN
+    .cfi_def_cfa_offset FRAME_LEN
+
+    /* make a frame */
+    SARG    fp, FRAME_LEN - 2*PTRS(sp)
+    .cfi_offset 8, -2*PTRS
+    SARG    ra, FRAME_LEN - 1*PTRS(sp)
+    .cfi_offset 1, -1*PTRS
+    addi    fp, sp, FRAME_LEN
+
+    /* save arguments */
+#if FLTS
+    FSARG   fa0, 0*FLTS(sp)
+    FSARG   fa1, 1*FLTS(sp)
+    FSARG   fa2, 2*FLTS(sp)
+    FSARG   fa3, 3*FLTS(sp)
+    FSARG   fa4, 4*FLTS(sp)
+    FSARG   fa5, 5*FLTS(sp)
+    FSARG   fa6, 6*FLTS(sp)
+    FSARG   fa7, 7*FLTS(sp)
+#endif
+
+    SARG    a0, 8*FLTS+0*PTRS(sp)
+    SARG    a1, 8*FLTS+1*PTRS(sp)
+    SARG    a2, 8*FLTS+2*PTRS(sp)
+    SARG    a3, 8*FLTS+3*PTRS(sp)
+    SARG    a4, 8*FLTS+4*PTRS(sp)
+    SARG    a5, 8*FLTS+5*PTRS(sp)
+    SARG    a6, 8*FLTS+6*PTRS(sp)
+    SARG    a7, 8*FLTS+7*PTRS(sp)
+
+    /* enter C */
+    addi    a0, sp, FRAME_LEN
+    mv      a1, sp
+    mv      a2, t1
+
+    call    ffi_closure_inner
+
+    /* return values */
+#if FLTS
+    FLARG   fa0, 0*FLTS(sp)
+    FLARG   fa1, 1*FLTS(sp)
+#endif
+
+    LARG    a0, 8*FLTS+0*PTRS(sp)
+    LARG    a1, 8*FLTS+1*PTRS(sp)
+
+    /* restore and return */
+    LARG    ra, FRAME_LEN-1*PTRS(sp)
+    .cfi_restore 1
+    LARG    fp, FRAME_LEN-2*PTRS(sp)
+    .cfi_restore 8
+    addi    sp, sp, FRAME_LEN
+    .cfi_def_cfa_offset 0
+    ret
+    .cfi_endproc
+    .size ffi_closure_asm, .-ffi_closure_asm