forked from mirror/tinycc
-
Notifications
You must be signed in to change notification settings - Fork 0
/
tccasm.c
1318 lines (1240 loc) · 36.2 KB
/
tccasm.c
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
/*
* GAS like assembler for TCC
*
* Copyright (c) 2001-2004 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define USING_GLOBALS
#include "tcc.h"
#ifdef CONFIG_TCC_ASM
static Section *last_text_section; /* to handle .previous asm directive */
ST_FUNC int asm_get_local_label_name(TCCState *s1, unsigned int n)
{
char buf[64];
snprintf(buf, sizeof(buf), "L..%u", n);
return tok_alloc_const(buf);
}
static int tcc_assemble_internal(TCCState *s1, int do_preprocess, int global);
static Sym* asm_new_label(TCCState *s1, int label, int is_local);
static Sym* asm_new_label1(TCCState *s1, int label, int is_local, int sh_num, int value);
/* If a C name has an _ prepended then only asm labels that start
with _ are representable in C, by removing the first _. ASM names
without _ at the beginning don't correspond to C names, but we use
the global C symbol table to track ASM names as well, so we need to
transform those into ones that don't conflict with a C name,
so prepend a '.' for them, but force the ELF asm name to be set. */
static int asm2cname(int v, int *addeddot)
{
const char *name;
*addeddot = 0;
if (!tcc_state->leading_underscore)
return v;
name = get_tok_str(v, NULL);
if (!name)
return v;
if (name[0] == '_') {
v = tok_alloc_const(name + 1);
} else if (!strchr(name, '.')) {
char newname[256];
snprintf(newname, sizeof newname, ".%s", name);
v = tok_alloc_const(newname);
*addeddot = 1;
}
return v;
}
static Sym *asm_label_find(int v)
{
Sym *sym;
int addeddot;
v = asm2cname(v, &addeddot);
sym = sym_find(v);
while (sym && sym->sym_scope && !(sym->type.t & VT_STATIC))
sym = sym->prev_tok;
return sym;
}
static Sym *asm_label_push(int v)
{
int addeddot, v2 = asm2cname(v, &addeddot);
/* We always add VT_EXTERN, for sym definition that's tentative
(for .set, removed for real defs), for mere references it's correct
as is. */
Sym *sym = global_identifier_push(v2, VT_ASM | VT_EXTERN | VT_STATIC, 0);
if (addeddot)
sym->asm_label = v;
return sym;
}
/* Return a symbol we can use inside the assembler, having name NAME.
Symbols from asm and C source share a namespace. If we generate
an asm symbol it's also a (file-global) C symbol, but it's
either not accessible by name (like "L.123"), or its type information
is such that it's not usable without a proper C declaration.
Sometimes we need symbols accessible by name from asm, which
are anonymous in C, in this case CSYM can be used to transfer
all information from that symbol to the (possibly newly created)
asm symbol. */
ST_FUNC Sym* get_asm_sym(int name, Sym *csym)
{
Sym *sym = asm_label_find(name);
if (!sym) {
sym = asm_label_push(name);
if (csym)
sym->c = csym->c;
}
return sym;
}
static Sym* asm_section_sym(TCCState *s1, Section *sec)
{
char buf[100]; int label; Sym *sym;
snprintf(buf, sizeof buf, "L.%s", sec->name);
label = tok_alloc_const(buf);
sym = asm_label_find(label);
return sym ? sym : asm_new_label1(s1, label, 1, sec->sh_num, 0);
}
/* We do not use the C expression parser to handle symbols. Maybe the
C expression parser could be tweaked to do so. */
static void asm_expr_unary(TCCState *s1, ExprValue *pe)
{
Sym *sym;
int op, label;
uint64_t n;
const char *p;
switch(tok) {
case TOK_PPNUM:
p = tokc.str.data;
n = strtoull(p, (char **)&p, 0);
if (*p == 'b' || *p == 'f') {
/* backward or forward label */
label = asm_get_local_label_name(s1, n);
sym = asm_label_find(label);
if (*p == 'b') {
/* backward : find the last corresponding defined label */
if (sym && (!sym->c || elfsym(sym)->st_shndx == SHN_UNDEF))
sym = sym->prev_tok;
if (!sym)
tcc_error("local label '%d' not found backward", (int)n);
} else {
/* forward */
if (!sym || (sym->c && elfsym(sym)->st_shndx != SHN_UNDEF)) {
/* if the last label is defined, then define a new one */
sym = asm_label_push(label);
}
}
pe->v = 0;
pe->sym = sym;
pe->pcrel = 0;
} else if (*p == '\0') {
pe->v = n;
pe->sym = NULL;
pe->pcrel = 0;
} else {
tcc_error("invalid number syntax");
}
next();
break;
case '+':
next();
asm_expr_unary(s1, pe);
break;
case '-':
case '~':
op = tok;
next();
asm_expr_unary(s1, pe);
if (pe->sym)
tcc_error("invalid operation with label");
if (op == '-')
pe->v = -pe->v;
else
pe->v = ~pe->v;
break;
case TOK_CCHAR:
case TOK_LCHAR:
pe->v = tokc.i;
pe->sym = NULL;
pe->pcrel = 0;
next();
break;
case '(':
next();
asm_expr(s1, pe);
skip(')');
break;
case '.':
pe->v = ind;
pe->sym = asm_section_sym(s1, cur_text_section);
pe->pcrel = 0;
next();
break;
default:
if (tok >= TOK_IDENT) {
ElfSym *esym;
/* label case : if the label was not found, add one */
sym = get_asm_sym(tok, NULL);
esym = elfsym(sym);
if (esym && esym->st_shndx == SHN_ABS) {
/* if absolute symbol, no need to put a symbol value */
pe->v = esym->st_value;
pe->sym = NULL;
pe->pcrel = 0;
} else {
pe->v = 0;
pe->sym = sym;
pe->pcrel = 0;
}
next();
} else {
tcc_error("bad expression syntax [%s]", get_tok_str(tok, &tokc));
}
break;
}
}
static void asm_expr_prod(TCCState *s1, ExprValue *pe)
{
int op;
ExprValue e2;
asm_expr_unary(s1, pe);
for(;;) {
op = tok;
if (op != '*' && op != '/' && op != '%' &&
op != TOK_SHL && op != TOK_SAR)
break;
next();
asm_expr_unary(s1, &e2);
if (pe->sym || e2.sym)
tcc_error("invalid operation with label");
switch(op) {
case '*':
pe->v *= e2.v;
break;
case '/':
if (e2.v == 0) {
div_error:
tcc_error("division by zero");
}
pe->v /= e2.v;
break;
case '%':
if (e2.v == 0)
goto div_error;
pe->v %= e2.v;
break;
case TOK_SHL:
pe->v <<= e2.v;
break;
default:
case TOK_SAR:
pe->v >>= e2.v;
break;
}
}
}
static void asm_expr_logic(TCCState *s1, ExprValue *pe)
{
int op;
ExprValue e2;
asm_expr_prod(s1, pe);
for(;;) {
op = tok;
if (op != '&' && op != '|' && op != '^')
break;
next();
asm_expr_prod(s1, &e2);
if (pe->sym || e2.sym)
tcc_error("invalid operation with label");
switch(op) {
case '&':
pe->v &= e2.v;
break;
case '|':
pe->v |= e2.v;
break;
default:
case '^':
pe->v ^= e2.v;
break;
}
}
}
static inline void asm_expr_sum(TCCState *s1, ExprValue *pe)
{
int op;
ExprValue e2;
asm_expr_logic(s1, pe);
for(;;) {
op = tok;
if (op != '+' && op != '-')
break;
next();
asm_expr_logic(s1, &e2);
if (op == '+') {
if (pe->sym != NULL && e2.sym != NULL)
goto cannot_relocate;
pe->v += e2.v;
if (pe->sym == NULL && e2.sym != NULL)
pe->sym = e2.sym;
} else {
pe->v -= e2.v;
/* NOTE: we are less powerful than gas in that case
because we store only one symbol in the expression */
if (!e2.sym) {
/* OK */
} else if (pe->sym == e2.sym) {
/* OK */
pe->sym = NULL; /* same symbols can be subtracted to NULL */
} else {
ElfSym *esym1, *esym2;
esym1 = elfsym(pe->sym);
esym2 = elfsym(e2.sym);
if (esym1 && esym1->st_shndx == esym2->st_shndx
&& esym1->st_shndx != SHN_UNDEF) {
/* we also accept defined symbols in the same section */
pe->v += esym1->st_value - esym2->st_value;
pe->sym = NULL;
} else if (esym2->st_shndx == cur_text_section->sh_num) {
/* When subtracting a defined symbol in current section
this actually makes the value PC-relative. */
pe->v -= esym2->st_value - ind - 4;
pe->pcrel = 1;
e2.sym = NULL;
} else {
cannot_relocate:
tcc_error("invalid operation with label");
}
}
}
}
}
static inline void asm_expr_cmp(TCCState *s1, ExprValue *pe)
{
int op;
ExprValue e2;
asm_expr_sum(s1, pe);
for(;;) {
op = tok;
if (op != TOK_EQ && op != TOK_NE
&& (op > TOK_GT || op < TOK_ULE))
break;
next();
asm_expr_sum(s1, &e2);
if (pe->sym || e2.sym)
tcc_error("invalid operation with label");
switch(op) {
case TOK_EQ:
pe->v = pe->v == e2.v;
break;
case TOK_NE:
pe->v = pe->v != e2.v;
break;
case TOK_LT:
pe->v = (int64_t)pe->v < (int64_t)e2.v;
break;
case TOK_GE:
pe->v = (int64_t)pe->v >= (int64_t)e2.v;
break;
case TOK_LE:
pe->v = (int64_t)pe->v <= (int64_t)e2.v;
break;
case TOK_GT:
pe->v = (int64_t)pe->v > (int64_t)e2.v;
break;
default:
break;
}
/* GAS compare results are -1/0 not 1/0. */
pe->v = -(int64_t)pe->v;
}
}
ST_FUNC void asm_expr(TCCState *s1, ExprValue *pe)
{
asm_expr_cmp(s1, pe);
}
ST_FUNC int asm_int_expr(TCCState *s1)
{
ExprValue e;
asm_expr(s1, &e);
if (e.sym)
expect("constant");
return e.v;
}
static Sym* asm_new_label1(TCCState *s1, int label, int is_local,
int sh_num, int value)
{
Sym *sym;
ElfSym *esym;
sym = asm_label_find(label);
if (sym) {
esym = elfsym(sym);
/* A VT_EXTERN symbol, even if it has a section is considered
overridable. This is how we "define" .set targets. Real
definitions won't have VT_EXTERN set. */
if (esym && esym->st_shndx != SHN_UNDEF) {
/* the label is already defined */
if (IS_ASM_SYM(sym)
&& (is_local == 1 || (sym->type.t & VT_EXTERN)))
goto new_label;
if (!(sym->type.t & VT_EXTERN))
tcc_error("assembler label '%s' already defined",
get_tok_str(label, NULL));
}
} else {
new_label:
sym = asm_label_push(label);
}
if (!sym->c)
put_extern_sym2(sym, SHN_UNDEF, 0, 0, 1);
esym = elfsym(sym);
esym->st_shndx = sh_num;
esym->st_value = value;
if (is_local != 2)
sym->type.t &= ~VT_EXTERN;
return sym;
}
static Sym* asm_new_label(TCCState *s1, int label, int is_local)
{
return asm_new_label1(s1, label, is_local, cur_text_section->sh_num, ind);
}
/* Set the value of LABEL to that of some expression (possibly
involving other symbols). LABEL can be overwritten later still. */
static Sym* set_symbol(TCCState *s1, int label)
{
long n;
ExprValue e;
Sym *sym;
ElfSym *esym;
next();
asm_expr(s1, &e);
n = e.v;
esym = elfsym(e.sym);
if (esym)
n += esym->st_value;
sym = asm_new_label1(s1, label, 2, esym ? esym->st_shndx : SHN_ABS, n);
elfsym(sym)->st_other |= ST_ASM_SET;
return sym;
}
static void use_section1(TCCState *s1, Section *sec)
{
cur_text_section->data_offset = ind;
cur_text_section = sec;
ind = cur_text_section->data_offset;
}
static void use_section(TCCState *s1, const char *name)
{
Section *sec;
sec = find_section(s1, name);
use_section1(s1, sec);
}
static void push_section(TCCState *s1, const char *name)
{
Section *sec = find_section(s1, name);
sec->prev = cur_text_section;
use_section1(s1, sec);
}
static void pop_section(TCCState *s1)
{
Section *prev = cur_text_section->prev;
if (!prev)
tcc_error(".popsection without .pushsection");
cur_text_section->prev = NULL;
use_section1(s1, prev);
}
static void asm_parse_directive(TCCState *s1, int global)
{
int n, offset, v, size, tok1;
Section *sec;
uint8_t *ptr;
/* assembler directive */
sec = cur_text_section;
switch(tok) {
case TOK_ASMDIR_align:
case TOK_ASMDIR_balign:
case TOK_ASMDIR_p2align:
case TOK_ASMDIR_skip:
case TOK_ASMDIR_space:
tok1 = tok;
next();
n = asm_int_expr(s1);
if (tok1 == TOK_ASMDIR_p2align)
{
if (n < 0 || n > 30)
tcc_error("invalid p2align, must be between 0 and 30");
n = 1 << n;
tok1 = TOK_ASMDIR_align;
}
if (tok1 == TOK_ASMDIR_align || tok1 == TOK_ASMDIR_balign) {
if (n < 0 || (n & (n-1)) != 0)
tcc_error("alignment must be a positive power of two");
offset = (ind + n - 1) & -n;
size = offset - ind;
/* the section must have a compatible alignment */
if (sec->sh_addralign < n)
sec->sh_addralign = n;
} else {
if (n < 0)
n = 0;
size = n;
}
v = 0;
if (tok == ',') {
next();
v = asm_int_expr(s1);
}
zero_pad:
if (sec->sh_type != SHT_NOBITS) {
sec->data_offset = ind;
ptr = section_ptr_add(sec, size);
memset(ptr, v, size);
}
ind += size;
break;
case TOK_ASMDIR_quad:
#ifdef TCC_TARGET_X86_64
size = 8;
goto asm_data;
#else
next();
for(;;) {
uint64_t vl;
const char *p;
p = tokc.str.data;
if (tok != TOK_PPNUM) {
error_constant:
tcc_error("64 bit constant");
}
vl = strtoll(p, (char **)&p, 0);
if (*p != '\0')
goto error_constant;
next();
if (sec->sh_type != SHT_NOBITS) {
/* XXX: endianness */
gen_le32(vl);
gen_le32(vl >> 32);
} else {
ind += 8;
}
if (tok != ',')
break;
next();
}
break;
#endif
case TOK_ASMDIR_byte:
size = 1;
goto asm_data;
case TOK_ASMDIR_word:
case TOK_ASMDIR_short:
size = 2;
goto asm_data;
case TOK_ASMDIR_long:
case TOK_ASMDIR_int:
size = 4;
asm_data:
next();
for(;;) {
ExprValue e;
asm_expr(s1, &e);
if (sec->sh_type != SHT_NOBITS) {
if (size == 4) {
gen_expr32(&e);
#ifdef TCC_TARGET_X86_64
} else if (size == 8) {
gen_expr64(&e);
#endif
} else {
if (e.sym)
expect("constant");
if (size == 1)
g(e.v);
else
gen_le16(e.v);
}
} else {
ind += size;
}
if (tok != ',')
break;
next();
}
break;
case TOK_ASMDIR_fill:
{
int repeat, size, val, i, j;
uint8_t repeat_buf[8];
next();
repeat = asm_int_expr(s1);
if (repeat < 0) {
tcc_error("repeat < 0; .fill ignored");
break;
}
size = 1;
val = 0;
if (tok == ',') {
next();
size = asm_int_expr(s1);
if (size < 0) {
tcc_error("size < 0; .fill ignored");
break;
}
if (size > 8)
size = 8;
if (tok == ',') {
next();
val = asm_int_expr(s1);
}
}
/* XXX: endianness */
repeat_buf[0] = val;
repeat_buf[1] = val >> 8;
repeat_buf[2] = val >> 16;
repeat_buf[3] = val >> 24;
repeat_buf[4] = 0;
repeat_buf[5] = 0;
repeat_buf[6] = 0;
repeat_buf[7] = 0;
for(i = 0; i < repeat; i++) {
for(j = 0; j < size; j++) {
g(repeat_buf[j]);
}
}
}
break;
case TOK_ASMDIR_rept:
{
int repeat;
TokenString *init_str;
next();
repeat = asm_int_expr(s1);
init_str = tok_str_alloc();
while (next(), tok != TOK_ASMDIR_endr) {
if (tok == CH_EOF)
tcc_error("we at end of file, .endr not found");
tok_str_add_tok(init_str);
}
tok_str_add(init_str, -1);
tok_str_add(init_str, 0);
begin_macro(init_str, 1);
while (repeat-- > 0) {
tcc_assemble_internal(s1, (parse_flags & PARSE_FLAG_PREPROCESS),
global);
macro_ptr = init_str->str;
}
end_macro();
next();
break;
}
case TOK_ASMDIR_org:
{
unsigned long n;
ExprValue e;
ElfSym *esym;
next();
asm_expr(s1, &e);
n = e.v;
esym = elfsym(e.sym);
if (esym) {
if (esym->st_shndx != cur_text_section->sh_num)
expect("constant or same-section symbol");
n += esym->st_value;
}
if (n < ind)
tcc_error("attempt to .org backwards");
v = 0;
size = n - ind;
goto zero_pad;
}
break;
case TOK_ASMDIR_set:
next();
tok1 = tok;
next();
/* Also accept '.set stuff', but don't do anything with this.
It's used in GAS to set various features like '.set mips16'. */
if (tok == ',')
set_symbol(s1, tok1);
break;
case TOK_ASMDIR_globl:
case TOK_ASMDIR_global:
case TOK_ASMDIR_weak:
case TOK_ASMDIR_hidden:
tok1 = tok;
do {
Sym *sym;
next();
sym = get_asm_sym(tok, NULL);
if (tok1 != TOK_ASMDIR_hidden)
sym->type.t &= ~VT_STATIC;
if (tok1 == TOK_ASMDIR_weak)
sym->a.weak = 1;
else if (tok1 == TOK_ASMDIR_hidden)
sym->a.visibility = STV_HIDDEN;
update_storage(sym);
next();
} while (tok == ',');
break;
case TOK_ASMDIR_string:
case TOK_ASMDIR_ascii:
case TOK_ASMDIR_asciz:
{
const uint8_t *p;
int i, size, t;
t = tok;
next();
for(;;) {
if (tok != TOK_STR)
expect("string constant");
p = tokc.str.data;
size = tokc.str.size;
if (t == TOK_ASMDIR_ascii && size > 0)
size--;
for(i = 0; i < size; i++)
g(p[i]);
next();
if (tok == ',') {
next();
} else if (tok != TOK_STR) {
break;
}
}
}
break;
case TOK_ASMDIR_text:
case TOK_ASMDIR_data:
case TOK_ASMDIR_bss:
{
char sname[64];
tok1 = tok;
n = 0;
next();
if (tok != ';' && tok != TOK_LINEFEED) {
n = asm_int_expr(s1);
next();
}
if (n)
sprintf(sname, "%s%d", get_tok_str(tok1, NULL), n);
else
sprintf(sname, "%s", get_tok_str(tok1, NULL));
use_section(s1, sname);
}
break;
case TOK_ASMDIR_file:
{
char filename[512];
filename[0] = '\0';
next();
if (tok == TOK_STR)
pstrcat(filename, sizeof(filename), tokc.str.data);
else
pstrcat(filename, sizeof(filename), get_tok_str(tok, NULL));
tcc_warning_c(warn_unsupported)("ignoring .file %s", filename);
next();
}
break;
case TOK_ASMDIR_ident:
{
char ident[256];
ident[0] = '\0';
next();
if (tok == TOK_STR)
pstrcat(ident, sizeof(ident), tokc.str.data);
else
pstrcat(ident, sizeof(ident), get_tok_str(tok, NULL));
tcc_warning_c(warn_unsupported)("ignoring .ident %s", ident);
next();
}
break;
case TOK_ASMDIR_size:
{
Sym *sym;
next();
sym = asm_label_find(tok);
if (!sym) {
tcc_error("label not found: %s", get_tok_str(tok, NULL));
}
/* XXX .size name,label2-label1 */
tcc_warning_c(warn_unsupported)("ignoring .size %s,*", get_tok_str(tok, NULL));
next();
skip(',');
while (tok != TOK_LINEFEED && tok != ';' && tok != CH_EOF) {
next();
}
}
break;
case TOK_ASMDIR_type:
{
Sym *sym;
const char *newtype;
next();
sym = get_asm_sym(tok, NULL);
next();
skip(',');
if (tok == TOK_STR) {
newtype = tokc.str.data;
} else {
if (tok == '@' || tok == '%')
next();
newtype = get_tok_str(tok, NULL);
}
if (!strcmp(newtype, "function") || !strcmp(newtype, "STT_FUNC")) {
sym->type.t = (sym->type.t & ~VT_BTYPE) | VT_FUNC;
} else
tcc_warning_c(warn_unsupported)("change type of '%s' from 0x%x to '%s' ignored",
get_tok_str(sym->v, NULL), sym->type.t, newtype);
next();
}
break;
case TOK_ASMDIR_pushsection:
case TOK_ASMDIR_section:
{
char sname[256];
int old_nb_section = s1->nb_sections;
tok1 = tok;
/* XXX: support more options */
next();
sname[0] = '\0';
while (tok != ';' && tok != TOK_LINEFEED && tok != ',') {
if (tok == TOK_STR)
pstrcat(sname, sizeof(sname), tokc.str.data);
else
pstrcat(sname, sizeof(sname), get_tok_str(tok, NULL));
next();
}
if (tok == ',') {
/* skip section options */
next();
if (tok != TOK_STR)
expect("string constant");
next();
if (tok == ',') {
next();
if (tok == '@' || tok == '%')
next();
next();
}
}
last_text_section = cur_text_section;
if (tok1 == TOK_ASMDIR_section)
use_section(s1, sname);
else
push_section(s1, sname);
/* If we just allocated a new section reset its alignment to
1. new_section normally acts for GCC compatibility and
sets alignment to PTR_SIZE. The assembler behaves different. */
if (old_nb_section != s1->nb_sections)
cur_text_section->sh_addralign = 1;
}
break;
case TOK_ASMDIR_previous:
{
Section *sec;
next();
if (!last_text_section)
tcc_error("no previous section referenced");
sec = cur_text_section;
use_section1(s1, last_text_section);
last_text_section = sec;
}
break;
case TOK_ASMDIR_popsection:
next();
pop_section(s1);
break;
#ifdef TCC_TARGET_I386
case TOK_ASMDIR_code16:
{
next();
s1->seg_size = 16;
}
break;
case TOK_ASMDIR_code32:
{
next();
s1->seg_size = 32;
}
break;
#endif
#ifdef TCC_TARGET_X86_64
/* added for compatibility with GAS */
case TOK_ASMDIR_code64:
next();
break;
#endif
default:
tcc_error("unknown assembler directive '.%s'", get_tok_str(tok, NULL));
break;
}
}
/* assemble a file */
static int tcc_assemble_internal(TCCState *s1, int do_preprocess, int global)
{
int opcode;
int saved_parse_flags = parse_flags;
parse_flags = PARSE_FLAG_ASM_FILE | PARSE_FLAG_TOK_STR;
if (do_preprocess)
parse_flags |= PARSE_FLAG_PREPROCESS;
for(;;) {
next();
if (tok == TOK_EOF)
break;
parse_flags |= PARSE_FLAG_LINEFEED; /* XXX: suppress that hack */
redo:
if (tok == '#') {
/* horrible gas comment */
while (tok != TOK_LINEFEED)
next();
} else if (tok >= TOK_ASMDIR_FIRST && tok <= TOK_ASMDIR_LAST) {
asm_parse_directive(s1, global);
} else if (tok == TOK_PPNUM) {
const char *p;
int n;
p = tokc.str.data;
n = strtoul(p, (char **)&p, 10);
if (*p != '\0')
expect("':'");
/* new local label */
asm_new_label(s1, asm_get_local_label_name(s1, n), 1);
next();
skip(':');
goto redo;
} else if (tok >= TOK_IDENT) {
/* instruction or label */
opcode = tok;
next();
if (tok == ':') {
/* new label */
asm_new_label(s1, opcode, 0);
next();
goto redo;
} else if (tok == '=') {
set_symbol(s1, opcode);
goto redo;
} else {
asm_opcode(s1, opcode);
}
}
/* end of line */
if (tok != ';' && tok != TOK_LINEFEED)
expect("end of line");
parse_flags &= ~PARSE_FLAG_LINEFEED; /* XXX: suppress that hack */
}
parse_flags = saved_parse_flags;
return 0;
}
/* Assemble the current file */
ST_FUNC int tcc_assemble(TCCState *s1, int do_preprocess)
{
int ret;
tcc_debug_start(s1);
/* default section is text */
cur_text_section = text_section;
ind = cur_text_section->data_offset;
nocode_wanted = 0;
ret = tcc_assemble_internal(s1, do_preprocess, 1);
cur_text_section->data_offset = ind;
tcc_debug_end(s1);
return ret;
}
/********************************************************************/
/* GCC inline asm support */
/* assemble the string 'str' in the current C compilation unit without
C preprocessing. NOTE: str is modified by modifying the '\0' at the