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Add const qualifiers at various places.
[binutils-gdb.git] / gas / config / tc-arc.c
1 /* tc-arc.c -- Assembler for the ARC
2 Copyright (C) 1994-2016 Free Software Foundation, Inc.
3
4 Contributor: Claudiu Zissulescu <claziss@synopsys.com>
5
6 This file is part of GAS, the GNU Assembler.
7
8 GAS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
11 any later version.
12
13 GAS is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "as.h"
24 #include "subsegs.h"
25 #include "struc-symbol.h"
26 #include "dwarf2dbg.h"
27 #include "dw2gencfi.h"
28 #include "safe-ctype.h"
29
30 #include "opcode/arc.h"
31 #include "elf/arc.h"
32
33 /* Defines section. */
34
35 #define MAX_INSN_FIXUPS 2
36 #define MAX_CONSTR_STR 20
37 #define FRAG_MAX_GROWTH 8
38
39 #ifdef DEBUG
40 # define pr_debug(fmt, args...) fprintf (stderr, fmt, ##args)
41 #else
42 # define pr_debug(fmt, args...)
43 #endif
44
45 #define MAJOR_OPCODE(x) (((x) & 0xF8000000) >> 27)
46 #define SUB_OPCODE(x) (((x) & 0x003F0000) >> 16)
47 #define LP_INSN(x) ((MAJOR_OPCODE (x) == 0x4) && \
48 (SUB_OPCODE (x) == 0x28))
49
50 /* Equal to MAX_PRECISION in atof-ieee.c. */
51 #define MAX_LITTLENUMS 6
52
53 /* Enum used to enumerate the relaxable ins operands. */
54 enum rlx_operand_type
55 {
56 EMPTY = 0,
57 REGISTER,
58 REGISTER_S, /* Register for short instruction(s). */
59 REGISTER_NO_GP, /* Is a register but not gp register specifically. */
60 REGISTER_DUP, /* Duplication of previous operand of type register. */
61 IMMEDIATE,
62 BRACKET
63 };
64
65 enum arc_rlx_types
66 {
67 ARC_RLX_NONE = 0,
68 ARC_RLX_BL_S,
69 ARC_RLX_BL,
70 ARC_RLX_B_S,
71 ARC_RLX_B,
72 ARC_RLX_ADD_U3,
73 ARC_RLX_ADD_U6,
74 ARC_RLX_ADD_LIMM,
75 ARC_RLX_LD_U7,
76 ARC_RLX_LD_S9,
77 ARC_RLX_LD_LIMM,
78 ARC_RLX_MOV_U8,
79 ARC_RLX_MOV_S12,
80 ARC_RLX_MOV_LIMM,
81 ARC_RLX_SUB_U3,
82 ARC_RLX_SUB_U6,
83 ARC_RLX_SUB_LIMM,
84 ARC_RLX_MPY_U6,
85 ARC_RLX_MPY_LIMM,
86 ARC_RLX_MOV_RU6,
87 ARC_RLX_MOV_RLIMM,
88 ARC_RLX_ADD_RRU6,
89 ARC_RLX_ADD_RRLIMM,
90 };
91
92 /* Macros section. */
93
94 #define regno(x) ((x) & 0x3F)
95 #define is_ir_num(x) (((x) & ~0x3F) == 0)
96 #define is_code_density_p(op) (((op)->subclass == CD1 || (op)->subclass == CD2))
97 #define is_br_jmp_insn_p(op) (((op)->class == BRANCH || (op)->class == JUMP))
98 #define is_kernel_insn_p(op) (((op)->class == KERNEL))
99
100 /* Generic assembler global variables which must be defined by all
101 targets. */
102
103 /* Characters which always start a comment. */
104 const char comment_chars[] = "#;";
105
106 /* Characters which start a comment at the beginning of a line. */
107 const char line_comment_chars[] = "#";
108
109 /* Characters which may be used to separate multiple commands on a
110 single line. */
111 const char line_separator_chars[] = "`";
112
113 /* Characters which are used to indicate an exponent in a floating
114 point number. */
115 const char EXP_CHARS[] = "eE";
116
117 /* Chars that mean this number is a floating point constant
118 As in 0f12.456 or 0d1.2345e12. */
119 const char FLT_CHARS[] = "rRsSfFdD";
120
121 /* Byte order. */
122 extern int target_big_endian;
123 const char *arc_target_format = DEFAULT_TARGET_FORMAT;
124 static int byte_order = DEFAULT_BYTE_ORDER;
125
126 /* By default relaxation is disabled. */
127 static int relaxation_state = 0;
128
129 extern int arc_get_mach (char *);
130
131 /* Forward declarations. */
132 static void arc_lcomm (int);
133 static void arc_option (int);
134 static void arc_extra_reloc (int);
135
136
137 const pseudo_typeS md_pseudo_table[] =
138 {
139 /* Make sure that .word is 32 bits. */
140 { "word", cons, 4 },
141
142 { "align", s_align_bytes, 0 }, /* Defaulting is invalid (0). */
143 { "lcomm", arc_lcomm, 0 },
144 { "lcommon", arc_lcomm, 0 },
145 { "cpu", arc_option, 0 },
146
147 { "tls_gd_ld", arc_extra_reloc, BFD_RELOC_ARC_TLS_GD_LD },
148 { "tls_gd_call", arc_extra_reloc, BFD_RELOC_ARC_TLS_GD_CALL },
149
150 { NULL, NULL, 0 }
151 };
152
153 const char *md_shortopts = "";
154
155 enum options
156 {
157 OPTION_EB = OPTION_MD_BASE,
158 OPTION_EL,
159
160 OPTION_ARC600,
161 OPTION_ARC601,
162 OPTION_ARC700,
163 OPTION_ARCEM,
164 OPTION_ARCHS,
165
166 OPTION_MCPU,
167 OPTION_CD,
168 OPTION_RELAX,
169
170 /* The following options are deprecated and provided here only for
171 compatibility reasons. */
172 OPTION_USER_MODE,
173 OPTION_LD_EXT_MASK,
174 OPTION_SWAP,
175 OPTION_NORM,
176 OPTION_BARREL_SHIFT,
177 OPTION_MIN_MAX,
178 OPTION_NO_MPY,
179 OPTION_EA,
180 OPTION_MUL64,
181 OPTION_SIMD,
182 OPTION_SPFP,
183 OPTION_DPFP,
184 OPTION_XMAC_D16,
185 OPTION_XMAC_24,
186 OPTION_DSP_PACKA,
187 OPTION_CRC,
188 OPTION_DVBF,
189 OPTION_TELEPHONY,
190 OPTION_XYMEMORY,
191 OPTION_LOCK,
192 OPTION_SWAPE,
193 OPTION_RTSC,
194 OPTION_FPUDA
195 };
196
197 struct option md_longopts[] =
198 {
199 { "EB", no_argument, NULL, OPTION_EB },
200 { "EL", no_argument, NULL, OPTION_EL },
201 { "mcpu", required_argument, NULL, OPTION_MCPU },
202 { "mA6", no_argument, NULL, OPTION_ARC600 },
203 { "mARC600", no_argument, NULL, OPTION_ARC600 },
204 { "mARC601", no_argument, NULL, OPTION_ARC601 },
205 { "mARC700", no_argument, NULL, OPTION_ARC700 },
206 { "mA7", no_argument, NULL, OPTION_ARC700 },
207 { "mEM", no_argument, NULL, OPTION_ARCEM },
208 { "mHS", no_argument, NULL, OPTION_ARCHS },
209 { "mcode-density", no_argument, NULL, OPTION_CD },
210 { "mrelax", no_argument, NULL, OPTION_RELAX },
211
212 /* The following options are deprecated and provided here only for
213 compatibility reasons. */
214 { "mav2em", no_argument, NULL, OPTION_ARCEM },
215 { "mav2hs", no_argument, NULL, OPTION_ARCHS },
216 { "muser-mode-only", no_argument, NULL, OPTION_USER_MODE },
217 { "mld-extension-reg-mask", required_argument, NULL, OPTION_LD_EXT_MASK },
218 { "mswap", no_argument, NULL, OPTION_SWAP },
219 { "mnorm", no_argument, NULL, OPTION_NORM },
220 { "mbarrel-shifter", no_argument, NULL, OPTION_BARREL_SHIFT },
221 { "mbarrel_shifter", no_argument, NULL, OPTION_BARREL_SHIFT },
222 { "mmin-max", no_argument, NULL, OPTION_MIN_MAX },
223 { "mmin_max", no_argument, NULL, OPTION_MIN_MAX },
224 { "mno-mpy", no_argument, NULL, OPTION_NO_MPY },
225 { "mea", no_argument, NULL, OPTION_EA },
226 { "mEA", no_argument, NULL, OPTION_EA },
227 { "mmul64", no_argument, NULL, OPTION_MUL64 },
228 { "msimd", no_argument, NULL, OPTION_SIMD},
229 { "mspfp", no_argument, NULL, OPTION_SPFP},
230 { "mspfp-compact", no_argument, NULL, OPTION_SPFP},
231 { "mspfp_compact", no_argument, NULL, OPTION_SPFP},
232 { "mspfp-fast", no_argument, NULL, OPTION_SPFP},
233 { "mspfp_fast", no_argument, NULL, OPTION_SPFP},
234 { "mdpfp", no_argument, NULL, OPTION_DPFP},
235 { "mdpfp-compact", no_argument, NULL, OPTION_DPFP},
236 { "mdpfp_compact", no_argument, NULL, OPTION_DPFP},
237 { "mdpfp-fast", no_argument, NULL, OPTION_DPFP},
238 { "mdpfp_fast", no_argument, NULL, OPTION_DPFP},
239 { "mmac-d16", no_argument, NULL, OPTION_XMAC_D16},
240 { "mmac_d16", no_argument, NULL, OPTION_XMAC_D16},
241 { "mmac-24", no_argument, NULL, OPTION_XMAC_24},
242 { "mmac_24", no_argument, NULL, OPTION_XMAC_24},
243 { "mdsp-packa", no_argument, NULL, OPTION_DSP_PACKA},
244 { "mdsp_packa", no_argument, NULL, OPTION_DSP_PACKA},
245 { "mcrc", no_argument, NULL, OPTION_CRC},
246 { "mdvbf", no_argument, NULL, OPTION_DVBF},
247 { "mtelephony", no_argument, NULL, OPTION_TELEPHONY},
248 { "mxy", no_argument, NULL, OPTION_XYMEMORY},
249 { "mlock", no_argument, NULL, OPTION_LOCK},
250 { "mswape", no_argument, NULL, OPTION_SWAPE},
251 { "mrtsc", no_argument, NULL, OPTION_RTSC},
252 { "mfpuda", no_argument, NULL, OPTION_FPUDA},
253
254 { NULL, no_argument, NULL, 0 }
255 };
256
257 size_t md_longopts_size = sizeof (md_longopts);
258
259 /* Local data and data types. */
260
261 /* Used since new relocation types are introduced in this
262 file (DUMMY_RELOC_LITUSE_*). */
263 typedef int extended_bfd_reloc_code_real_type;
264
265 struct arc_fixup
266 {
267 expressionS exp;
268
269 extended_bfd_reloc_code_real_type reloc;
270
271 /* index into arc_operands. */
272 unsigned int opindex;
273
274 /* PC-relative, used by internals fixups. */
275 unsigned char pcrel;
276
277 /* TRUE if this fixup is for LIMM operand. */
278 bfd_boolean islong;
279 };
280
281 struct arc_insn
282 {
283 unsigned int insn;
284 int nfixups;
285 struct arc_fixup fixups[MAX_INSN_FIXUPS];
286 long limm;
287 bfd_boolean short_insn; /* Boolean value: TRUE if current insn is
288 short. */
289 bfd_boolean has_limm; /* Boolean value: TRUE if limm field is
290 valid. */
291 bfd_boolean relax; /* Boolean value: TRUE if needs
292 relaxation. */
293 };
294
295 /* Structure to hold any last two instructions. */
296 static struct arc_last_insn
297 {
298 /* Saved instruction opcode. */
299 const struct arc_opcode *opcode;
300
301 /* Boolean value: TRUE if current insn is short. */
302 bfd_boolean has_limm;
303
304 /* Boolean value: TRUE if current insn has delay slot. */
305 bfd_boolean has_delay_slot;
306 } arc_last_insns[2];
307
308 /* Forward declaration. */
309 static void assemble_insn
310 (const struct arc_opcode *, const expressionS *, int,
311 const struct arc_flags *, int, struct arc_insn *);
312
313 /* The cpu for which we are generating code. */
314 static unsigned arc_target = ARC_OPCODE_BASE;
315 static const char *arc_target_name = "<all>";
316 static unsigned arc_features = 0x00;
317
318 /* The default architecture. */
319 static int arc_mach_type = bfd_mach_arc_arcv2;
320
321 /* Non-zero if the cpu type has been explicitly specified. */
322 static int mach_type_specified_p = 0;
323
324 /* The hash table of instruction opcodes. */
325 static struct hash_control *arc_opcode_hash;
326
327 /* The hash table of register symbols. */
328 static struct hash_control *arc_reg_hash;
329
330 /* A table of CPU names and opcode sets. */
331 static const struct cpu_type
332 {
333 const char *name;
334 unsigned flags;
335 int mach;
336 unsigned eflags;
337 unsigned features;
338 }
339 cpu_types[] =
340 {
341 { "arc600", ARC_OPCODE_ARC600, bfd_mach_arc_arc600,
342 E_ARC_MACH_ARC600, 0x00},
343 { "arc700", ARC_OPCODE_ARC700, bfd_mach_arc_arc700,
344 E_ARC_MACH_ARC700, 0x00},
345 { "arcem", ARC_OPCODE_ARCv2EM, bfd_mach_arc_arcv2,
346 EF_ARC_CPU_ARCV2EM, ARC_CD},
347 { "archs", ARC_OPCODE_ARCv2HS, bfd_mach_arc_arcv2,
348 EF_ARC_CPU_ARCV2HS, ARC_CD},
349 { "all", ARC_OPCODE_BASE, bfd_mach_arc_arcv2,
350 0x00, 0x00 },
351 { 0, 0, 0, 0, 0 }
352 };
353
354 /* Used by the arc_reloc_op table. Order is important. */
355 #define O_gotoff O_md1 /* @gotoff relocation. */
356 #define O_gotpc O_md2 /* @gotpc relocation. */
357 #define O_plt O_md3 /* @plt relocation. */
358 #define O_sda O_md4 /* @sda relocation. */
359 #define O_pcl O_md5 /* @pcl relocation. */
360 #define O_tlsgd O_md6 /* @tlsgd relocation. */
361 #define O_tlsie O_md7 /* @tlsie relocation. */
362 #define O_tpoff9 O_md8 /* @tpoff9 relocation. */
363 #define O_tpoff O_md9 /* @tpoff relocation. */
364 #define O_dtpoff9 O_md10 /* @dtpoff9 relocation. */
365 #define O_dtpoff O_md11 /* @dtpoff relocation. */
366 #define O_last O_dtpoff
367
368 /* Used to define a bracket as operand in tokens. */
369 #define O_bracket O_md32
370
371 /* Dummy relocation, to be sorted out. */
372 #define DUMMY_RELOC_ARC_ENTRY (BFD_RELOC_UNUSED + 1)
373
374 #define USER_RELOC_P(R) ((R) >= O_gotoff && (R) <= O_last)
375
376 /* A table to map the spelling of a relocation operand into an appropriate
377 bfd_reloc_code_real_type type. The table is assumed to be ordered such
378 that op-O_literal indexes into it. */
379 #define ARC_RELOC_TABLE(op) \
380 (&arc_reloc_op[ ((!USER_RELOC_P (op)) \
381 ? (abort (), 0) \
382 : (int) (op) - (int) O_gotoff) ])
383
384 #define DEF(NAME, RELOC, REQ) \
385 { #NAME, sizeof (#NAME)-1, O_##NAME, RELOC, REQ}
386
387 static const struct arc_reloc_op_tag
388 {
389 /* String to lookup. */
390 const char *name;
391 /* Size of the string. */
392 size_t length;
393 /* Which operator to use. */
394 operatorT op;
395 extended_bfd_reloc_code_real_type reloc;
396 /* Allows complex relocation expression like identifier@reloc +
397 const. */
398 unsigned int complex_expr : 1;
399 }
400 arc_reloc_op[] =
401 {
402 DEF (gotoff, BFD_RELOC_ARC_GOTOFF, 1),
403 DEF (gotpc, BFD_RELOC_ARC_GOTPC32, 0),
404 DEF (plt, BFD_RELOC_ARC_PLT32, 0),
405 DEF (sda, DUMMY_RELOC_ARC_ENTRY, 1),
406 DEF (pcl, BFD_RELOC_ARC_PC32, 1),
407 DEF (tlsgd, BFD_RELOC_ARC_TLS_GD_GOT, 0),
408 DEF (tlsie, BFD_RELOC_ARC_TLS_IE_GOT, 0),
409 DEF (tpoff9, BFD_RELOC_ARC_TLS_LE_S9, 0),
410 DEF (tpoff, BFD_RELOC_ARC_TLS_LE_32, 1),
411 DEF (dtpoff9, BFD_RELOC_ARC_TLS_DTPOFF_S9, 0),
412 DEF (dtpoff, BFD_RELOC_ARC_TLS_DTPOFF, 0),
413 };
414
415 static const int arc_num_reloc_op
416 = sizeof (arc_reloc_op) / sizeof (*arc_reloc_op);
417
418 /* Structure for relaxable instruction that have to be swapped with a
419 smaller alternative instruction. */
420 struct arc_relaxable_ins
421 {
422 /* Mnemonic that should be checked. */
423 const char *mnemonic_r;
424
425 /* Operands that should be checked.
426 Indexes of operands from operand array. */
427 enum rlx_operand_type operands[6];
428
429 /* Flags that should be checked. */
430 unsigned flag_classes[5];
431
432 /* Mnemonic (smaller) alternative to be used later for relaxation. */
433 const char *mnemonic_alt;
434
435 /* Index of operand that generic relaxation has to check. */
436 unsigned opcheckidx;
437
438 /* Base subtype index used. */
439 enum arc_rlx_types subtype;
440 };
441
442 #define RELAX_TABLE_ENTRY(BITS, ISSIGNED, SIZE, NEXT) \
443 { (ISSIGNED) ? ((1 << ((BITS) - 1)) - 1) : ((1 << (BITS)) - 1), \
444 (ISSIGNED) ? -(1 << ((BITS) - 1)) : 0, \
445 (SIZE), \
446 (NEXT) } \
447
448 #define RELAX_TABLE_ENTRY_MAX(ISSIGNED, SIZE, NEXT) \
449 { (ISSIGNED) ? 0x7FFFFFFF : 0xFFFFFFFF, \
450 (ISSIGNED) ? -(0x7FFFFFFF) : 0, \
451 (SIZE), \
452 (NEXT) } \
453
454
455 /* ARC relaxation table. */
456 const relax_typeS md_relax_table[] =
457 {
458 /* Fake entry. */
459 {0, 0, 0, 0},
460
461 /* BL_S s13 ->
462 BL s25. */
463 RELAX_TABLE_ENTRY(13, 1, 2, ARC_RLX_BL),
464 RELAX_TABLE_ENTRY(25, 1, 4, ARC_RLX_NONE),
465
466 /* B_S s10 ->
467 B s25. */
468 RELAX_TABLE_ENTRY(10, 1, 2, ARC_RLX_B),
469 RELAX_TABLE_ENTRY(25, 1, 4, ARC_RLX_NONE),
470
471 /* ADD_S c,b, u3 ->
472 ADD<.f> a,b,u6 ->
473 ADD<.f> a,b,limm. */
474 RELAX_TABLE_ENTRY(3, 0, 2, ARC_RLX_ADD_U6),
475 RELAX_TABLE_ENTRY(6, 0, 4, ARC_RLX_ADD_LIMM),
476 RELAX_TABLE_ENTRY_MAX(0, 8, ARC_RLX_NONE),
477
478 /* LD_S a, [b, u7] ->
479 LD<zz><.x><.aa><.di> a, [b, s9] ->
480 LD<zz><.x><.aa><.di> a, [b, limm] */
481 RELAX_TABLE_ENTRY(7, 0, 2, ARC_RLX_LD_S9),
482 RELAX_TABLE_ENTRY(9, 1, 4, ARC_RLX_LD_LIMM),
483 RELAX_TABLE_ENTRY_MAX(1, 8, ARC_RLX_NONE),
484
485 /* MOV_S b, u8 ->
486 MOV<.f> b, s12 ->
487 MOV<.f> b, limm. */
488 RELAX_TABLE_ENTRY(8, 0, 2, ARC_RLX_MOV_S12),
489 RELAX_TABLE_ENTRY(8, 0, 4, ARC_RLX_MOV_LIMM),
490 RELAX_TABLE_ENTRY_MAX(0, 8, ARC_RLX_NONE),
491
492 /* SUB_S c, b, u3 ->
493 SUB<.f> a, b, u6 ->
494 SUB<.f> a, b, limm. */
495 RELAX_TABLE_ENTRY(3, 0, 2, ARC_RLX_SUB_U6),
496 RELAX_TABLE_ENTRY(6, 0, 4, ARC_RLX_SUB_LIMM),
497 RELAX_TABLE_ENTRY_MAX(0, 8, ARC_RLX_NONE),
498
499 /* MPY<.f> a, b, u6 ->
500 MPY<.f> a, b, limm. */
501 RELAX_TABLE_ENTRY(6, 0, 4, ARC_RLX_MPY_LIMM),
502 RELAX_TABLE_ENTRY_MAX(0, 8, ARC_RLX_NONE),
503
504 /* MOV<.f><.cc> b, u6 ->
505 MOV<.f><.cc> b, limm. */
506 RELAX_TABLE_ENTRY(6, 0, 4, ARC_RLX_MOV_RLIMM),
507 RELAX_TABLE_ENTRY_MAX(0, 8, ARC_RLX_NONE),
508
509 /* ADD<.f><.cc> b, b, u6 ->
510 ADD<.f><.cc> b, b, limm. */
511 RELAX_TABLE_ENTRY(6, 0, 4, ARC_RLX_ADD_RRLIMM),
512 RELAX_TABLE_ENTRY_MAX(0, 8, ARC_RLX_NONE),
513 };
514
515 /* Order of this table's entries matters! */
516 const struct arc_relaxable_ins arc_relaxable_insns[] =
517 {
518 { "bl", { IMMEDIATE }, { 0 }, "bl_s", 0, ARC_RLX_BL_S },
519 { "b", { IMMEDIATE }, { 0 }, "b_s", 0, ARC_RLX_B_S },
520 { "add", { REGISTER, REGISTER_DUP, IMMEDIATE }, { 5, 1, 0 }, "add",
521 2, ARC_RLX_ADD_RRU6},
522 { "add", { REGISTER_S, REGISTER_S, IMMEDIATE }, { 0 }, "add_s", 2,
523 ARC_RLX_ADD_U3 },
524 { "add", { REGISTER, REGISTER, IMMEDIATE }, { 5, 0 }, "add", 2,
525 ARC_RLX_ADD_U6 },
526 { "ld", { REGISTER_S, BRACKET, REGISTER_S, IMMEDIATE, BRACKET },
527 { 0 }, "ld_s", 3, ARC_RLX_LD_U7 },
528 { "ld", { REGISTER, BRACKET, REGISTER_NO_GP, IMMEDIATE, BRACKET },
529 { 11, 4, 14, 17, 0 }, "ld", 3, ARC_RLX_LD_S9 },
530 { "mov", { REGISTER_S, IMMEDIATE }, { 0 }, "mov_s", 1, ARC_RLX_MOV_U8 },
531 { "mov", { REGISTER, IMMEDIATE }, { 5, 0 }, "mov", 1, ARC_RLX_MOV_S12 },
532 { "mov", { REGISTER, IMMEDIATE }, { 5, 1, 0 },"mov", 1, ARC_RLX_MOV_RU6 },
533 { "sub", { REGISTER_S, REGISTER_S, IMMEDIATE }, { 0 }, "sub_s", 2,
534 ARC_RLX_SUB_U3 },
535 { "sub", { REGISTER, REGISTER, IMMEDIATE }, { 5, 0 }, "sub", 2,
536 ARC_RLX_SUB_U6 },
537 { "mpy", { REGISTER, REGISTER, IMMEDIATE }, { 5, 0 }, "mpy", 2,
538 ARC_RLX_MPY_U6 },
539 };
540
541 const unsigned arc_num_relaxable_ins = ARRAY_SIZE (arc_relaxable_insns);
542
543 /* Flags to set in the elf header. */
544 static flagword arc_eflag = 0x00;
545
546 /* Pre-defined "_GLOBAL_OFFSET_TABLE_". */
547 symbolS * GOT_symbol = 0;
548
549 /* Set to TRUE when we assemble instructions. */
550 static bfd_boolean assembling_insn = FALSE;
551
552 /* Functions implementation. */
553
554 /* Like md_number_to_chars but used for limms. The 4-byte limm value,
555 is encoded as 'middle-endian' for a little-endian target. FIXME!
556 this function is used for regular 4 byte instructions as well. */
557
558 static void
559 md_number_to_chars_midend (char *buf, valueT val, int n)
560 {
561 if (n == 4)
562 {
563 md_number_to_chars (buf, (val & 0xffff0000) >> 16, 2);
564 md_number_to_chars (buf + 2, (val & 0xffff), 2);
565 }
566 else
567 {
568 md_number_to_chars (buf, val, n);
569 }
570 }
571
572 /* Here ends all the ARCompact extension instruction assembling
573 stuff. */
574
575 static void
576 arc_extra_reloc (int r_type)
577 {
578 char *sym_name, c;
579 symbolS *sym, *lab = NULL;
580
581 if (*input_line_pointer == '@')
582 input_line_pointer++;
583 c = get_symbol_name (&sym_name);
584 sym = symbol_find_or_make (sym_name);
585 restore_line_pointer (c);
586 if (c == ',' && r_type == BFD_RELOC_ARC_TLS_GD_LD)
587 {
588 ++input_line_pointer;
589 char *lab_name;
590 c = get_symbol_name (&lab_name);
591 lab = symbol_find_or_make (lab_name);
592 restore_line_pointer (c);
593 }
594
595 /* These relocations exist as a mechanism for the compiler to tell the
596 linker how to patch the code if the tls model is optimised. However,
597 the relocation itself does not require any space within the assembler
598 fragment, and so we pass a size of 0.
599
600 The lines that generate these relocations look like this:
601
602 .tls_gd_ld @.tdata`bl __tls_get_addr@plt
603
604 The '.tls_gd_ld @.tdata' is processed first and generates the
605 additional relocation, while the 'bl __tls_get_addr@plt' is processed
606 second and generates the additional branch.
607
608 It is possible that the additional relocation generated by the
609 '.tls_gd_ld @.tdata' will be attached at the very end of one fragment,
610 while the 'bl __tls_get_addr@plt' will be generated as the first thing
611 in the next fragment. This will be fine; both relocations will still
612 appear to be at the same address in the generated object file.
613 However, this only works as the additional relocation is generated
614 with size of 0 bytes. */
615 fixS *fixP
616 = fix_new (frag_now, /* Which frag? */
617 frag_now_fix (), /* Where in that frag? */
618 0, /* size: 1, 2, or 4 usually. */
619 sym, /* X_add_symbol. */
620 0, /* X_add_number. */
621 FALSE, /* TRUE if PC-relative relocation. */
622 r_type /* Relocation type. */);
623 fixP->fx_subsy = lab;
624 }
625
626 static symbolS *
627 arc_lcomm_internal (int ignore ATTRIBUTE_UNUSED,
628 symbolS *symbolP, addressT size)
629 {
630 addressT align = 0;
631 SKIP_WHITESPACE ();
632
633 if (*input_line_pointer == ',')
634 {
635 align = parse_align (1);
636
637 if (align == (addressT) -1)
638 return NULL;
639 }
640 else
641 {
642 if (size >= 8)
643 align = 3;
644 else if (size >= 4)
645 align = 2;
646 else if (size >= 2)
647 align = 1;
648 else
649 align = 0;
650 }
651
652 bss_alloc (symbolP, size, align);
653 S_CLEAR_EXTERNAL (symbolP);
654
655 return symbolP;
656 }
657
658 static void
659 arc_lcomm (int ignore)
660 {
661 symbolS *symbolP = s_comm_internal (ignore, arc_lcomm_internal);
662
663 if (symbolP)
664 symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;
665 }
666
667 /* Select the cpu we're assembling for. */
668
669 static void
670 arc_option (int ignore ATTRIBUTE_UNUSED)
671 {
672 int mach = -1;
673 char c;
674 char *cpu;
675
676 c = get_symbol_name (&cpu);
677 mach = arc_get_mach (cpu);
678
679 if (mach == -1)
680 goto bad_cpu;
681
682 if (!mach_type_specified_p)
683 {
684 if ((!strcmp ("ARC600", cpu))
685 || (!strcmp ("ARC601", cpu))
686 || (!strcmp ("A6", cpu)))
687 {
688 md_parse_option (OPTION_MCPU, "arc600");
689 }
690 else if ((!strcmp ("ARC700", cpu))
691 || (!strcmp ("A7", cpu)))
692 {
693 md_parse_option (OPTION_MCPU, "arc700");
694 }
695 else if (!strcmp ("EM", cpu))
696 {
697 md_parse_option (OPTION_MCPU, "arcem");
698 }
699 else if (!strcmp ("HS", cpu))
700 {
701 md_parse_option (OPTION_MCPU, "archs");
702 }
703 else
704 as_fatal ("could not find the architecture");
705
706 if (!bfd_set_arch_mach (stdoutput, bfd_arch_arc, mach))
707 as_fatal ("could not set architecture and machine");
708 }
709 else
710 if (arc_mach_type != mach)
711 as_warn ("Command-line value overrides \".cpu\" directive");
712
713 restore_line_pointer (c);
714 demand_empty_rest_of_line ();
715 return;
716
717 bad_cpu:
718 restore_line_pointer (c);
719 as_bad ("invalid identifier for \".cpu\"");
720 ignore_rest_of_line ();
721 }
722
723 /* Smartly print an expression. */
724
725 static void
726 debug_exp (expressionS *t)
727 {
728 const char *name ATTRIBUTE_UNUSED;
729 const char *namemd ATTRIBUTE_UNUSED;
730
731 pr_debug ("debug_exp: ");
732
733 switch (t->X_op)
734 {
735 default: name = "unknown"; break;
736 case O_illegal: name = "O_illegal"; break;
737 case O_absent: name = "O_absent"; break;
738 case O_constant: name = "O_constant"; break;
739 case O_symbol: name = "O_symbol"; break;
740 case O_symbol_rva: name = "O_symbol_rva"; break;
741 case O_register: name = "O_register"; break;
742 case O_big: name = "O_big"; break;
743 case O_uminus: name = "O_uminus"; break;
744 case O_bit_not: name = "O_bit_not"; break;
745 case O_logical_not: name = "O_logical_not"; break;
746 case O_multiply: name = "O_multiply"; break;
747 case O_divide: name = "O_divide"; break;
748 case O_modulus: name = "O_modulus"; break;
749 case O_left_shift: name = "O_left_shift"; break;
750 case O_right_shift: name = "O_right_shift"; break;
751 case O_bit_inclusive_or: name = "O_bit_inclusive_or"; break;
752 case O_bit_or_not: name = "O_bit_or_not"; break;
753 case O_bit_exclusive_or: name = "O_bit_exclusive_or"; break;
754 case O_bit_and: name = "O_bit_and"; break;
755 case O_add: name = "O_add"; break;
756 case O_subtract: name = "O_subtract"; break;
757 case O_eq: name = "O_eq"; break;
758 case O_ne: name = "O_ne"; break;
759 case O_lt: name = "O_lt"; break;
760 case O_le: name = "O_le"; break;
761 case O_ge: name = "O_ge"; break;
762 case O_gt: name = "O_gt"; break;
763 case O_logical_and: name = "O_logical_and"; break;
764 case O_logical_or: name = "O_logical_or"; break;
765 case O_index: name = "O_index"; break;
766 case O_bracket: name = "O_bracket"; break;
767 }
768
769 switch (t->X_md)
770 {
771 default: namemd = "unknown"; break;
772 case O_gotoff: namemd = "O_gotoff"; break;
773 case O_gotpc: namemd = "O_gotpc"; break;
774 case O_plt: namemd = "O_plt"; break;
775 case O_sda: namemd = "O_sda"; break;
776 case O_pcl: namemd = "O_pcl"; break;
777 case O_tlsgd: namemd = "O_tlsgd"; break;
778 case O_tlsie: namemd = "O_tlsie"; break;
779 case O_tpoff9: namemd = "O_tpoff9"; break;
780 case O_tpoff: namemd = "O_tpoff"; break;
781 case O_dtpoff9: namemd = "O_dtpoff9"; break;
782 case O_dtpoff: namemd = "O_dtpoff"; break;
783 }
784
785 pr_debug ("%s (%s, %s, %d, %s)", name,
786 (t->X_add_symbol) ? S_GET_NAME (t->X_add_symbol) : "--",
787 (t->X_op_symbol) ? S_GET_NAME (t->X_op_symbol) : "--",
788 (int) t->X_add_number,
789 (t->X_md) ? namemd : "--");
790 pr_debug ("\n");
791 fflush (stderr);
792 }
793
794 /* Parse the arguments to an opcode. */
795
796 static int
797 tokenize_arguments (char *str,
798 expressionS *tok,
799 int ntok)
800 {
801 char *old_input_line_pointer;
802 bfd_boolean saw_comma = FALSE;
803 bfd_boolean saw_arg = FALSE;
804 int brk_lvl = 0;
805 int num_args = 0;
806 int i;
807 size_t len;
808 const struct arc_reloc_op_tag *r;
809 expressionS tmpE;
810 char *reloc_name, c;
811
812 memset (tok, 0, sizeof (*tok) * ntok);
813
814 /* Save and restore input_line_pointer around this function. */
815 old_input_line_pointer = input_line_pointer;
816 input_line_pointer = str;
817
818 while (*input_line_pointer)
819 {
820 SKIP_WHITESPACE ();
821 switch (*input_line_pointer)
822 {
823 case '\0':
824 goto fini;
825
826 case ',':
827 input_line_pointer++;
828 if (saw_comma || !saw_arg)
829 goto err;
830 saw_comma = TRUE;
831 break;
832
833 case '}':
834 case ']':
835 ++input_line_pointer;
836 --brk_lvl;
837 if (!saw_arg)
838 goto err;
839 tok->X_op = O_bracket;
840 ++tok;
841 ++num_args;
842 break;
843
844 case '{':
845 case '[':
846 input_line_pointer++;
847 if (brk_lvl)
848 goto err;
849 ++brk_lvl;
850 tok->X_op = O_bracket;
851 ++tok;
852 ++num_args;
853 break;
854
855 case '@':
856 /* We have labels, function names and relocations, all
857 starting with @ symbol. Sort them out. */
858 if (saw_arg && !saw_comma)
859 goto err;
860
861 /* Parse @label. */
862 tok->X_op = O_symbol;
863 tok->X_md = O_absent;
864 expression (tok);
865 if (*input_line_pointer != '@')
866 goto normalsymbol; /* This is not a relocation. */
867
868 relocationsym:
869
870 /* A relocation opernad has the following form
871 @identifier@relocation_type. The identifier is already
872 in tok! */
873 if (tok->X_op != O_symbol)
874 {
875 as_bad (_("No valid label relocation operand"));
876 goto err;
877 }
878
879 /* Parse @relocation_type. */
880 input_line_pointer++;
881 c = get_symbol_name (&reloc_name);
882 len = input_line_pointer - reloc_name;
883 if (len == 0)
884 {
885 as_bad (_("No relocation operand"));
886 goto err;
887 }
888
889 /* Go through known relocation and try to find a match. */
890 r = &arc_reloc_op[0];
891 for (i = arc_num_reloc_op - 1; i >= 0; i--, r++)
892 if (len == r->length
893 && memcmp (reloc_name, r->name, len) == 0)
894 break;
895 if (i < 0)
896 {
897 as_bad (_("Unknown relocation operand: @%s"), reloc_name);
898 goto err;
899 }
900
901 *input_line_pointer = c;
902 SKIP_WHITESPACE_AFTER_NAME ();
903 /* Extra check for TLS: base. */
904 if (*input_line_pointer == '@')
905 {
906 symbolS *base;
907 if (tok->X_op_symbol != NULL
908 || tok->X_op != O_symbol)
909 {
910 as_bad (_("Unable to parse TLS base: %s"),
911 input_line_pointer);
912 goto err;
913 }
914 input_line_pointer++;
915 char *sym_name;
916 c = get_symbol_name (&sym_name);
917 base = symbol_find_or_make (sym_name);
918 tok->X_op = O_subtract;
919 tok->X_op_symbol = base;
920 restore_line_pointer (c);
921 tmpE.X_add_number = 0;
922 }
923 else if ((*input_line_pointer != '+')
924 && (*input_line_pointer != '-'))
925 {
926 tmpE.X_add_number = 0;
927 }
928 else
929 {
930 /* Parse the constant of a complex relocation expression
931 like @identifier@reloc +/- const. */
932 if (! r->complex_expr)
933 {
934 as_bad (_("@%s is not a complex relocation."), r->name);
935 goto err;
936 }
937 expression (&tmpE);
938 if (tmpE.X_op != O_constant)
939 {
940 as_bad (_("Bad expression: @%s + %s."),
941 r->name, input_line_pointer);
942 goto err;
943 }
944 }
945
946 tok->X_md = r->op;
947 tok->X_add_number = tmpE.X_add_number;
948
949 debug_exp (tok);
950
951 saw_comma = FALSE;
952 saw_arg = TRUE;
953 tok++;
954 num_args++;
955 break;
956
957 case '%':
958 /* Can be a register. */
959 ++input_line_pointer;
960 /* Fall through. */
961 default:
962
963 if (saw_arg && !saw_comma)
964 goto err;
965
966 tok->X_op = O_absent;
967 tok->X_md = O_absent;
968 expression (tok);
969
970 /* Legacy: There are cases when we have
971 identifier@relocation_type, if it is the case parse the
972 relocation type as well. */
973 if (*input_line_pointer == '@')
974 goto relocationsym;
975
976 normalsymbol:
977 debug_exp (tok);
978
979 if (tok->X_op == O_illegal || tok->X_op == O_absent)
980 goto err;
981
982 saw_comma = FALSE;
983 saw_arg = TRUE;
984 tok++;
985 num_args++;
986 break;
987 }
988 }
989
990 fini:
991 if (saw_comma || brk_lvl)
992 goto err;
993 input_line_pointer = old_input_line_pointer;
994
995 return num_args;
996
997 err:
998 if (brk_lvl)
999 as_bad (_("Brackets in operand field incorrect"));
1000 else if (saw_comma)
1001 as_bad (_("extra comma"));
1002 else if (!saw_arg)
1003 as_bad (_("missing argument"));
1004 else
1005 as_bad (_("missing comma or colon"));
1006 input_line_pointer = old_input_line_pointer;
1007 return -1;
1008 }
1009
1010 /* Parse the flags to a structure. */
1011
1012 static int
1013 tokenize_flags (const char *str,
1014 struct arc_flags flags[],
1015 int nflg)
1016 {
1017 char *old_input_line_pointer;
1018 bfd_boolean saw_flg = FALSE;
1019 bfd_boolean saw_dot = FALSE;
1020 int num_flags = 0;
1021 size_t flgnamelen;
1022
1023 memset (flags, 0, sizeof (*flags) * nflg);
1024
1025 /* Save and restore input_line_pointer around this function. */
1026 old_input_line_pointer = input_line_pointer;
1027 input_line_pointer = (char *) str;
1028
1029 while (*input_line_pointer)
1030 {
1031 switch (*input_line_pointer)
1032 {
1033 case ' ':
1034 case '\0':
1035 goto fini;
1036
1037 case '.':
1038 input_line_pointer++;
1039 if (saw_dot)
1040 goto err;
1041 saw_dot = TRUE;
1042 saw_flg = FALSE;
1043 break;
1044
1045 default:
1046 if (saw_flg && !saw_dot)
1047 goto err;
1048
1049 if (num_flags >= nflg)
1050 goto err;
1051
1052 flgnamelen = strspn (input_line_pointer, "abcdefghilmnopqrstvwxz");
1053 if (flgnamelen > MAX_FLAG_NAME_LENGHT)
1054 goto err;
1055
1056 memcpy (flags->name, input_line_pointer, flgnamelen);
1057
1058 input_line_pointer += flgnamelen;
1059 flags++;
1060 saw_dot = FALSE;
1061 saw_flg = TRUE;
1062 num_flags++;
1063 break;
1064 }
1065 }
1066
1067 fini:
1068 input_line_pointer = old_input_line_pointer;
1069 return num_flags;
1070
1071 err:
1072 if (saw_dot)
1073 as_bad (_("extra dot"));
1074 else if (!saw_flg)
1075 as_bad (_("unrecognized flag"));
1076 else
1077 as_bad (_("failed to parse flags"));
1078 input_line_pointer = old_input_line_pointer;
1079 return -1;
1080 }
1081
1082 /* Apply the fixups in order. */
1083
1084 static void
1085 apply_fixups (struct arc_insn *insn, fragS *fragP, int fix)
1086 {
1087 int i;
1088
1089 for (i = 0; i < insn->nfixups; i++)
1090 {
1091 struct arc_fixup *fixup = &insn->fixups[i];
1092 int size, pcrel, offset = 0;
1093
1094 /* FIXME! the reloc size is wrong in the BFD file.
1095 When it is fixed please delete me. */
1096 size = (insn->short_insn && !fixup->islong) ? 2 : 4;
1097
1098 if (fixup->islong)
1099 offset = (insn->short_insn) ? 2 : 4;
1100
1101 /* Some fixups are only used internally, thus no howto. */
1102 if ((int) fixup->reloc == 0)
1103 as_fatal (_("Unhandled reloc type"));
1104
1105 if ((int) fixup->reloc < 0)
1106 {
1107 /* FIXME! the reloc size is wrong in the BFD file.
1108 When it is fixed please enable me.
1109 size = (insn->short_insn && !fixup->islong) ? 2 : 4; */
1110 pcrel = fixup->pcrel;
1111 }
1112 else
1113 {
1114 reloc_howto_type *reloc_howto =
1115 bfd_reloc_type_lookup (stdoutput,
1116 (bfd_reloc_code_real_type) fixup->reloc);
1117 gas_assert (reloc_howto);
1118
1119 /* FIXME! the reloc size is wrong in the BFD file.
1120 When it is fixed please enable me.
1121 size = bfd_get_reloc_size (reloc_howto); */
1122 pcrel = reloc_howto->pc_relative;
1123 }
1124
1125 pr_debug ("%s:%d: apply_fixups: new %s fixup (PCrel:%s) of size %d @ \
1126 offset %d + %d\n",
1127 fragP->fr_file, fragP->fr_line,
1128 (fixup->reloc < 0) ? "Internal" :
1129 bfd_get_reloc_code_name (fixup->reloc),
1130 pcrel ? "Y" : "N",
1131 size, fix, offset);
1132 fix_new_exp (fragP, fix + offset,
1133 size, &fixup->exp, pcrel, fixup->reloc);
1134
1135 /* Check for ZOLs, and update symbol info if any. */
1136 if (LP_INSN (insn->insn))
1137 {
1138 gas_assert (fixup->exp.X_add_symbol);
1139 ARC_SET_FLAG (fixup->exp.X_add_symbol, ARC_FLAG_ZOL);
1140 }
1141 }
1142 }
1143
1144 /* Actually output an instruction with its fixup. */
1145
1146 static void
1147 emit_insn0 (struct arc_insn *insn, char *where, bfd_boolean relax)
1148 {
1149 char *f = where;
1150
1151 pr_debug ("Emit insn : 0x%x\n", insn->insn);
1152 pr_debug ("\tShort : 0x%d\n", insn->short_insn);
1153 pr_debug ("\tLong imm: 0x%lx\n", insn->limm);
1154
1155 /* Write out the instruction. */
1156 if (insn->short_insn)
1157 {
1158 if (insn->has_limm)
1159 {
1160 if (!relax)
1161 f = frag_more (6);
1162 md_number_to_chars (f, insn->insn, 2);
1163 md_number_to_chars_midend (f + 2, insn->limm, 4);
1164 dwarf2_emit_insn (6);
1165 }
1166 else
1167 {
1168 if (!relax)
1169 f = frag_more (2);
1170 md_number_to_chars (f, insn->insn, 2);
1171 dwarf2_emit_insn (2);
1172 }
1173 }
1174 else
1175 {
1176 if (insn->has_limm)
1177 {
1178 if (!relax)
1179 f = frag_more (8);
1180 md_number_to_chars_midend (f, insn->insn, 4);
1181 md_number_to_chars_midend (f + 4, insn->limm, 4);
1182 dwarf2_emit_insn (8);
1183 }
1184 else
1185 {
1186 if (!relax)
1187 f = frag_more (4);
1188 md_number_to_chars_midend (f, insn->insn, 4);
1189 dwarf2_emit_insn (4);
1190 }
1191 }
1192
1193 if (!relax)
1194 apply_fixups (insn, frag_now, (f - frag_now->fr_literal));
1195 }
1196
1197 static void
1198 emit_insn1 (struct arc_insn *insn)
1199 {
1200 /* How frag_var's args are currently configured:
1201 - rs_machine_dependent, to dictate it's a relaxation frag.
1202 - FRAG_MAX_GROWTH, maximum size of instruction
1203 - 0, variable size that might grow...unused by generic relaxation.
1204 - frag_now->fr_subtype, fr_subtype starting value, set previously.
1205 - s, opand expression.
1206 - 0, offset but it's unused.
1207 - 0, opcode but it's unused. */
1208 symbolS *s = make_expr_symbol (&insn->fixups[0].exp);
1209 frag_now->tc_frag_data.pcrel = insn->fixups[0].pcrel;
1210
1211 if (frag_room () < FRAG_MAX_GROWTH)
1212 {
1213 /* Handle differently when frag literal memory is exhausted.
1214 This is used because when there's not enough memory left in
1215 the current frag, a new frag is created and the information
1216 we put into frag_now->tc_frag_data is disregarded. */
1217
1218 struct arc_relax_type relax_info_copy;
1219 relax_substateT subtype = frag_now->fr_subtype;
1220
1221 memcpy (&relax_info_copy, &frag_now->tc_frag_data,
1222 sizeof (struct arc_relax_type));
1223
1224 frag_wane (frag_now);
1225 frag_grow (FRAG_MAX_GROWTH);
1226
1227 memcpy (&frag_now->tc_frag_data, &relax_info_copy,
1228 sizeof (struct arc_relax_type));
1229
1230 frag_var (rs_machine_dependent, FRAG_MAX_GROWTH, 0,
1231 subtype, s, 0, 0);
1232 }
1233 else
1234 frag_var (rs_machine_dependent, FRAG_MAX_GROWTH, 0,
1235 frag_now->fr_subtype, s, 0, 0);
1236 }
1237
1238 static void
1239 emit_insn (struct arc_insn *insn)
1240 {
1241 if (insn->relax)
1242 emit_insn1 (insn);
1243 else
1244 emit_insn0 (insn, NULL, FALSE);
1245 }
1246
1247 /* Check whether a symbol involves a register. */
1248
1249 static bfd_boolean
1250 contains_register (symbolS *sym)
1251 {
1252 if (sym)
1253 {
1254 expressionS *ex = symbol_get_value_expression (sym);
1255
1256 return ((O_register == ex->X_op)
1257 && !contains_register (ex->X_add_symbol)
1258 && !contains_register (ex->X_op_symbol));
1259 }
1260
1261 return FALSE;
1262 }
1263
1264 /* Returns the register number within a symbol. */
1265
1266 static int
1267 get_register (symbolS *sym)
1268 {
1269 if (!contains_register (sym))
1270 return -1;
1271
1272 expressionS *ex = symbol_get_value_expression (sym);
1273 return regno (ex->X_add_number);
1274 }
1275
1276 /* Return true if a RELOC is generic. A generic reloc is PC-rel of a
1277 simple ME relocation (e.g. RELOC_ARC_32_ME, BFD_RELOC_ARC_PC32. */
1278
1279 static bfd_boolean
1280 generic_reloc_p (extended_bfd_reloc_code_real_type reloc)
1281 {
1282 if (!reloc)
1283 return FALSE;
1284
1285 switch (reloc)
1286 {
1287 case BFD_RELOC_ARC_SDA_LDST:
1288 case BFD_RELOC_ARC_SDA_LDST1:
1289 case BFD_RELOC_ARC_SDA_LDST2:
1290 case BFD_RELOC_ARC_SDA16_LD:
1291 case BFD_RELOC_ARC_SDA16_LD1:
1292 case BFD_RELOC_ARC_SDA16_LD2:
1293 case BFD_RELOC_ARC_SDA16_ST2:
1294 case BFD_RELOC_ARC_SDA32_ME:
1295 return FALSE;
1296 default:
1297 return TRUE;
1298 }
1299 }
1300
1301 /* Allocates a tok entry. */
1302
1303 static int
1304 allocate_tok (expressionS *tok, int ntok, int cidx)
1305 {
1306 if (ntok > MAX_INSN_ARGS - 2)
1307 return 0; /* No space left. */
1308
1309 if (cidx > ntok)
1310 return 0; /* Incorect args. */
1311
1312 memcpy (&tok[ntok+1], &tok[ntok], sizeof (*tok));
1313
1314 if (cidx == ntok)
1315 return 1; /* Success. */
1316 return allocate_tok (tok, ntok - 1, cidx);
1317 }
1318
1319 /* Search forward through all variants of an opcode looking for a
1320 syntax match. */
1321
1322 static const struct arc_opcode *
1323 find_opcode_match (const struct arc_opcode *first_opcode,
1324 expressionS *tok,
1325 int *pntok,
1326 struct arc_flags *first_pflag,
1327 int nflgs,
1328 int *pcpumatch)
1329 {
1330 const struct arc_opcode *opcode = first_opcode;
1331 int ntok = *pntok;
1332 int got_cpu_match = 0;
1333 expressionS bktok[MAX_INSN_ARGS];
1334 int bkntok;
1335 expressionS emptyE;
1336
1337 memset (&emptyE, 0, sizeof (emptyE));
1338 memcpy (bktok, tok, MAX_INSN_ARGS * sizeof (*tok));
1339 bkntok = ntok;
1340
1341 do
1342 {
1343 const unsigned char *opidx;
1344 const unsigned char *flgidx;
1345 int tokidx = 0;
1346 const expressionS *t = &emptyE;
1347
1348 pr_debug ("%s:%d: find_opcode_match: trying opcode 0x%08X ",
1349 frag_now->fr_file, frag_now->fr_line, opcode->opcode);
1350
1351 /* Don't match opcodes that don't exist on this
1352 architecture. */
1353 if (!(opcode->cpu & arc_target))
1354 goto match_failed;
1355
1356 if (is_code_density_p (opcode) && !(arc_features & ARC_CD))
1357 goto match_failed;
1358
1359 got_cpu_match = 1;
1360 pr_debug ("cpu ");
1361
1362 /* Check the operands. */
1363 for (opidx = opcode->operands; *opidx; ++opidx)
1364 {
1365 const struct arc_operand *operand = &arc_operands[*opidx];
1366
1367 /* Only take input from real operands. */
1368 if ((operand->flags & ARC_OPERAND_FAKE)
1369 && !(operand->flags & ARC_OPERAND_BRAKET))
1370 continue;
1371
1372 /* When we expect input, make sure we have it. */
1373 if (tokidx >= ntok)
1374 goto match_failed;
1375
1376 /* Match operand type with expression type. */
1377 switch (operand->flags & ARC_OPERAND_TYPECHECK_MASK)
1378 {
1379 case ARC_OPERAND_IR:
1380 /* Check to be a register. */
1381 if ((tok[tokidx].X_op != O_register
1382 || !is_ir_num (tok[tokidx].X_add_number))
1383 && !(operand->flags & ARC_OPERAND_IGNORE))
1384 goto match_failed;
1385
1386 /* If expect duplicate, make sure it is duplicate. */
1387 if (operand->flags & ARC_OPERAND_DUPLICATE)
1388 {
1389 /* Check for duplicate. */
1390 if (t->X_op != O_register
1391 || !is_ir_num (t->X_add_number)
1392 || (regno (t->X_add_number) !=
1393 regno (tok[tokidx].X_add_number)))
1394 goto match_failed;
1395 }
1396
1397 /* Special handling? */
1398 if (operand->insert)
1399 {
1400 const char *errmsg = NULL;
1401 (*operand->insert)(0,
1402 regno (tok[tokidx].X_add_number),
1403 &errmsg);
1404 if (errmsg)
1405 {
1406 if (operand->flags & ARC_OPERAND_IGNORE)
1407 {
1408 /* Missing argument, create one. */
1409 if (!allocate_tok (tok, ntok - 1, tokidx))
1410 goto match_failed;
1411
1412 tok[tokidx].X_op = O_absent;
1413 ++ntok;
1414 }
1415 else
1416 goto match_failed;
1417 }
1418 }
1419
1420 t = &tok[tokidx];
1421 break;
1422
1423 case ARC_OPERAND_BRAKET:
1424 /* Check if bracket is also in opcode table as
1425 operand. */
1426 if (tok[tokidx].X_op != O_bracket)
1427 goto match_failed;
1428 break;
1429
1430 case ARC_OPERAND_LIMM:
1431 case ARC_OPERAND_SIGNED:
1432 case ARC_OPERAND_UNSIGNED:
1433 switch (tok[tokidx].X_op)
1434 {
1435 case O_illegal:
1436 case O_absent:
1437 case O_register:
1438 goto match_failed;
1439
1440 case O_bracket:
1441 /* Got an (too) early bracket, check if it is an
1442 ignored operand. N.B. This procedure works only
1443 when bracket is the last operand! */
1444 if (!(operand->flags & ARC_OPERAND_IGNORE))
1445 goto match_failed;
1446 /* Insert the missing operand. */
1447 if (!allocate_tok (tok, ntok - 1, tokidx))
1448 goto match_failed;
1449
1450 tok[tokidx].X_op = O_absent;
1451 ++ntok;
1452 break;
1453
1454 case O_constant:
1455 /* Check the range. */
1456 if (operand->bits != 32
1457 && !(operand->flags & ARC_OPERAND_NCHK))
1458 {
1459 offsetT min, max, val;
1460 val = tok[tokidx].X_add_number;
1461
1462 if (operand->flags & ARC_OPERAND_SIGNED)
1463 {
1464 max = (1 << (operand->bits - 1)) - 1;
1465 min = -(1 << (operand->bits - 1));
1466 }
1467 else
1468 {
1469 max = (1 << operand->bits) - 1;
1470 min = 0;
1471 }
1472
1473 if (val < min || val > max)
1474 goto match_failed;
1475
1476 /* Check alignmets. */
1477 if ((operand->flags & ARC_OPERAND_ALIGNED32)
1478 && (val & 0x03))
1479 goto match_failed;
1480
1481 if ((operand->flags & ARC_OPERAND_ALIGNED16)
1482 && (val & 0x01))
1483 goto match_failed;
1484 }
1485 else if (operand->flags & ARC_OPERAND_NCHK)
1486 {
1487 if (operand->insert)
1488 {
1489 const char *errmsg = NULL;
1490 (*operand->insert)(0,
1491 tok[tokidx].X_add_number,
1492 &errmsg);
1493 if (errmsg)
1494 goto match_failed;
1495 }
1496 else
1497 goto match_failed;
1498 }
1499 break;
1500
1501 case O_subtract:
1502 /* Check if it is register range. */
1503 if ((tok[tokidx].X_add_number == 0)
1504 && contains_register (tok[tokidx].X_add_symbol)
1505 && contains_register (tok[tokidx].X_op_symbol))
1506 {
1507 int regs;
1508
1509 regs = get_register (tok[tokidx].X_add_symbol);
1510 regs <<= 16;
1511 regs |= get_register (tok[tokidx].X_op_symbol);
1512 if (operand->insert)
1513 {
1514 const char *errmsg = NULL;
1515 (*operand->insert)(0,
1516 regs,
1517 &errmsg);
1518 if (errmsg)
1519 goto match_failed;
1520 }
1521 else
1522 goto match_failed;
1523 break;
1524 }
1525 default:
1526 if (operand->default_reloc == 0)
1527 goto match_failed; /* The operand needs relocation. */
1528
1529 /* Relocs requiring long immediate. FIXME! make it
1530 generic and move it to a function. */
1531 switch (tok[tokidx].X_md)
1532 {
1533 case O_gotoff:
1534 case O_gotpc:
1535 case O_pcl:
1536 case O_tpoff:
1537 case O_dtpoff:
1538 case O_tlsgd:
1539 case O_tlsie:
1540 if (!(operand->flags & ARC_OPERAND_LIMM))
1541 goto match_failed;
1542 case O_absent:
1543 if (!generic_reloc_p (operand->default_reloc))
1544 goto match_failed;
1545 default:
1546 break;
1547 }
1548 break;
1549 }
1550 /* If expect duplicate, make sure it is duplicate. */
1551 if (operand->flags & ARC_OPERAND_DUPLICATE)
1552 {
1553 if (t->X_op == O_illegal
1554 || t->X_op == O_absent
1555 || t->X_op == O_register
1556 || (t->X_add_number != tok[tokidx].X_add_number))
1557 goto match_failed;
1558 }
1559 t = &tok[tokidx];
1560 break;
1561
1562 default:
1563 /* Everything else should have been fake. */
1564 abort ();
1565 }
1566
1567 ++tokidx;
1568 }
1569 pr_debug ("opr ");
1570
1571 /* Check the flags. Iterate over the valid flag classes. */
1572 int lnflg = nflgs;
1573
1574 for (flgidx = opcode->flags; *flgidx && lnflg; ++flgidx)
1575 {
1576 /* Get a valid flag class. */
1577 const struct arc_flag_class *cl_flags = &arc_flag_classes[*flgidx];
1578 const unsigned *flgopridx;
1579
1580 for (flgopridx = cl_flags->flags; *flgopridx; ++flgopridx)
1581 {
1582 const struct arc_flag_operand *flg_operand;
1583 struct arc_flags *pflag = first_pflag;
1584 int i;
1585
1586 flg_operand = &arc_flag_operands[*flgopridx];
1587 for (i = 0; i < nflgs; i++, pflag++)
1588 {
1589 /* Match against the parsed flags. */
1590 if (!strcmp (flg_operand->name, pflag->name))
1591 {
1592 /*TODO: Check if it is duplicated. */
1593 pflag->code = *flgopridx;
1594 lnflg--;
1595 break; /* goto next flag class and parsed flag. */
1596 }
1597 }
1598 }
1599 }
1600 /* Did I check all the parsed flags? */
1601 if (lnflg)
1602 goto match_failed;
1603
1604 pr_debug ("flg");
1605 /* Possible match -- did we use all of our input? */
1606 if (tokidx == ntok)
1607 {
1608 *pntok = ntok;
1609 pr_debug ("\n");
1610 return opcode;
1611 }
1612
1613 match_failed:;
1614 pr_debug ("\n");
1615 /* Restore the original parameters. */
1616 memcpy (tok, bktok, MAX_INSN_ARGS * sizeof (*tok));
1617 ntok = bkntok;
1618 }
1619 while (++opcode - arc_opcodes < (int) arc_num_opcodes
1620 && !strcmp (opcode->name, first_opcode->name));
1621
1622 if (*pcpumatch)
1623 *pcpumatch = got_cpu_match;
1624
1625 return NULL;
1626 }
1627
1628 /* Swap operand tokens. */
1629
1630 static void
1631 swap_operand (expressionS *operand_array,
1632 unsigned source,
1633 unsigned destination)
1634 {
1635 expressionS cpy_operand;
1636 expressionS *src_operand;
1637 expressionS *dst_operand;
1638 size_t size;
1639
1640 if (source == destination)
1641 return;
1642
1643 src_operand = &operand_array[source];
1644 dst_operand = &operand_array[destination];
1645 size = sizeof (expressionS);
1646
1647 /* Make copy of operand to swap with and swap. */
1648 memcpy (&cpy_operand, dst_operand, size);
1649 memcpy (dst_operand, src_operand, size);
1650 memcpy (src_operand, &cpy_operand, size);
1651 }
1652
1653 /* Check if *op matches *tok type.
1654 Returns FALSE if they don't match, TRUE if they match. */
1655
1656 static bfd_boolean
1657 pseudo_operand_match (const expressionS *tok,
1658 const struct arc_operand_operation *op)
1659 {
1660 offsetT min, max, val;
1661 bfd_boolean ret;
1662 const struct arc_operand *operand_real = &arc_operands[op->operand_idx];
1663
1664 ret = FALSE;
1665 switch (tok->X_op)
1666 {
1667 case O_constant:
1668 if (operand_real->bits == 32 && (operand_real->flags & ARC_OPERAND_LIMM))
1669 ret = 1;
1670 else if (!(operand_real->flags & ARC_OPERAND_IR))
1671 {
1672 val = tok->X_add_number + op->count;
1673 if (operand_real->flags & ARC_OPERAND_SIGNED)
1674 {
1675 max = (1 << (operand_real->bits - 1)) - 1;
1676 min = -(1 << (operand_real->bits - 1));
1677 }
1678 else
1679 {
1680 max = (1 << operand_real->bits) - 1;
1681 min = 0;
1682 }
1683 if (min <= val && val <= max)
1684 ret = TRUE;
1685 }
1686 break;
1687
1688 case O_symbol:
1689 /* Handle all symbols as long immediates or signed 9. */
1690 if (operand_real->flags & ARC_OPERAND_LIMM ||
1691 ((operand_real->flags & ARC_OPERAND_SIGNED) && operand_real->bits == 9))
1692 ret = TRUE;
1693 break;
1694
1695 case O_register:
1696 if (operand_real->flags & ARC_OPERAND_IR)
1697 ret = TRUE;
1698 break;
1699
1700 case O_bracket:
1701 if (operand_real->flags & ARC_OPERAND_BRAKET)
1702 ret = TRUE;
1703 break;
1704
1705 default:
1706 /* Unknown. */
1707 break;
1708 }
1709 return ret;
1710 }
1711
1712 /* Find pseudo instruction in array. */
1713
1714 static const struct arc_pseudo_insn *
1715 find_pseudo_insn (const char *opname,
1716 int ntok,
1717 const expressionS *tok)
1718 {
1719 const struct arc_pseudo_insn *pseudo_insn = NULL;
1720 const struct arc_operand_operation *op;
1721 unsigned int i;
1722 int j;
1723
1724 for (i = 0; i < arc_num_pseudo_insn; ++i)
1725 {
1726 pseudo_insn = &arc_pseudo_insns[i];
1727 if (strcmp (pseudo_insn->mnemonic_p, opname) == 0)
1728 {
1729 op = pseudo_insn->operand;
1730 for (j = 0; j < ntok; ++j)
1731 if (!pseudo_operand_match (&tok[j], &op[j]))
1732 break;
1733
1734 /* Found the right instruction. */
1735 if (j == ntok)
1736 return pseudo_insn;
1737 }
1738 }
1739 return NULL;
1740 }
1741
1742 /* Assumes the expressionS *tok is of sufficient size. */
1743
1744 static const struct arc_opcode *
1745 find_special_case_pseudo (const char *opname,
1746 int *ntok,
1747 expressionS *tok,
1748 int *nflgs,
1749 struct arc_flags *pflags)
1750 {
1751 const struct arc_pseudo_insn *pseudo_insn = NULL;
1752 const struct arc_operand_operation *operand_pseudo;
1753 const struct arc_operand *operand_real;
1754 unsigned i;
1755 char construct_operand[MAX_CONSTR_STR];
1756
1757 /* Find whether opname is in pseudo instruction array. */
1758 pseudo_insn = find_pseudo_insn (opname, *ntok, tok);
1759
1760 if (pseudo_insn == NULL)
1761 return NULL;
1762
1763 /* Handle flag, Limited to one flag at the moment. */
1764 if (pseudo_insn->flag_r != NULL)
1765 *nflgs += tokenize_flags (pseudo_insn->flag_r, &pflags[*nflgs],
1766 MAX_INSN_FLGS - *nflgs);
1767
1768 /* Handle operand operations. */
1769 for (i = 0; i < pseudo_insn->operand_cnt; ++i)
1770 {
1771 operand_pseudo = &pseudo_insn->operand[i];
1772 operand_real = &arc_operands[operand_pseudo->operand_idx];
1773
1774 if (operand_real->flags & ARC_OPERAND_BRAKET &&
1775 !operand_pseudo->needs_insert)
1776 continue;
1777
1778 /* Has to be inserted (i.e. this token does not exist yet). */
1779 if (operand_pseudo->needs_insert)
1780 {
1781 if (operand_real->flags & ARC_OPERAND_BRAKET)
1782 {
1783 tok[i].X_op = O_bracket;
1784 ++(*ntok);
1785 continue;
1786 }
1787
1788 /* Check if operand is a register or constant and handle it
1789 by type. */
1790 if (operand_real->flags & ARC_OPERAND_IR)
1791 snprintf (construct_operand, MAX_CONSTR_STR, "r%d",
1792 operand_pseudo->count);
1793 else
1794 snprintf (construct_operand, MAX_CONSTR_STR, "%d",
1795 operand_pseudo->count);
1796
1797 tokenize_arguments (construct_operand, &tok[i], 1);
1798 ++(*ntok);
1799 }
1800
1801 else if (operand_pseudo->count)
1802 {
1803 /* Operand number has to be adjusted accordingly (by operand
1804 type). */
1805 switch (tok[i].X_op)
1806 {
1807 case O_constant:
1808 tok[i].X_add_number += operand_pseudo->count;
1809 break;
1810
1811 case O_symbol:
1812 break;
1813
1814 default:
1815 /* Ignored. */
1816 break;
1817 }
1818 }
1819 }
1820
1821 /* Swap operands if necessary. Only supports one swap at the
1822 moment. */
1823 for (i = 0; i < pseudo_insn->operand_cnt; ++i)
1824 {
1825 operand_pseudo = &pseudo_insn->operand[i];
1826
1827 if (operand_pseudo->swap_operand_idx == i)
1828 continue;
1829
1830 swap_operand (tok, i, operand_pseudo->swap_operand_idx);
1831
1832 /* Prevent a swap back later by breaking out. */
1833 break;
1834 }
1835
1836 return (const struct arc_opcode *)
1837 hash_find (arc_opcode_hash, pseudo_insn->mnemonic_r);
1838 }
1839
1840 static const struct arc_opcode *
1841 find_special_case_flag (const char *opname,
1842 int *nflgs,
1843 struct arc_flags *pflags)
1844 {
1845 unsigned int i;
1846 const char *flagnm;
1847 unsigned flag_idx, flag_arr_idx;
1848 size_t flaglen, oplen;
1849 const struct arc_flag_special *arc_flag_special_opcode;
1850 const struct arc_opcode *opcode;
1851
1852 /* Search for special case instruction. */
1853 for (i = 0; i < arc_num_flag_special; i++)
1854 {
1855 arc_flag_special_opcode = &arc_flag_special_cases[i];
1856 oplen = strlen (arc_flag_special_opcode->name);
1857
1858 if (strncmp (opname, arc_flag_special_opcode->name, oplen) != 0)
1859 continue;
1860
1861 /* Found a potential special case instruction, now test for
1862 flags. */
1863 for (flag_arr_idx = 0;; ++flag_arr_idx)
1864 {
1865 flag_idx = arc_flag_special_opcode->flags[flag_arr_idx];
1866 if (flag_idx == 0)
1867 break; /* End of array, nothing found. */
1868
1869 flagnm = arc_flag_operands[flag_idx].name;
1870 flaglen = strlen (flagnm);
1871 if (strcmp (opname + oplen, flagnm) == 0)
1872 {
1873 opcode = (const struct arc_opcode *)
1874 hash_find (arc_opcode_hash,
1875 arc_flag_special_opcode->name);
1876
1877 if (*nflgs + 1 > MAX_INSN_FLGS)
1878 break;
1879 memcpy (pflags[*nflgs].name, flagnm, flaglen);
1880 pflags[*nflgs].name[flaglen] = '\0';
1881 (*nflgs)++;
1882 return opcode;
1883 }
1884 }
1885 }
1886 return NULL;
1887 }
1888
1889 /* Used to find special case opcode. */
1890
1891 static const struct arc_opcode *
1892 find_special_case (const char *opname,
1893 int *nflgs,
1894 struct arc_flags *pflags,
1895 expressionS *tok,
1896 int *ntok)
1897 {
1898 const struct arc_opcode *opcode;
1899
1900 opcode = find_special_case_pseudo (opname, ntok, tok, nflgs, pflags);
1901
1902 if (opcode == NULL)
1903 opcode = find_special_case_flag (opname, nflgs, pflags);
1904
1905 return opcode;
1906 }
1907
1908 static void
1909 preprocess_operands (const struct arc_opcode *opcode,
1910 expressionS *tok,
1911 int ntok)
1912 {
1913 int i;
1914 size_t len;
1915 const char *p;
1916 unsigned j;
1917 const struct arc_aux_reg *auxr;
1918
1919 for (i = 0; i < ntok; i++)
1920 {
1921 switch (tok[i].X_op)
1922 {
1923 case O_illegal:
1924 case O_absent:
1925 break; /* Throw and error. */
1926
1927 case O_symbol:
1928 if (opcode->class != AUXREG)
1929 break;
1930 /* Convert the symbol to a constant if possible. */
1931 p = S_GET_NAME (tok[i].X_add_symbol);
1932 len = strlen (p);
1933
1934 auxr = &arc_aux_regs[0];
1935 for (j = 0; j < arc_num_aux_regs; j++, auxr++)
1936 if (len == auxr->length
1937 && strcasecmp (auxr->name, p) == 0)
1938 {
1939 tok[i].X_op = O_constant;
1940 tok[i].X_add_number = auxr->address;
1941 break;
1942 }
1943 break;
1944 default:
1945 break;
1946 }
1947 }
1948 }
1949
1950 /* Given an opcode name, pre-tockenized set of argumenst and the
1951 opcode flags, take it all the way through emission. */
1952
1953 static void
1954 assemble_tokens (const char *opname,
1955 expressionS *tok,
1956 int ntok,
1957 struct arc_flags *pflags,
1958 int nflgs)
1959 {
1960 bfd_boolean found_something = FALSE;
1961 const struct arc_opcode *opcode;
1962 int cpumatch = 1;
1963
1964 /* Search opcodes. */
1965 opcode = (const struct arc_opcode *) hash_find (arc_opcode_hash, opname);
1966
1967 /* Couldn't find opcode conventional way, try special cases. */
1968 if (!opcode)
1969 opcode = find_special_case (opname, &nflgs, pflags, tok, &ntok);
1970
1971 if (opcode)
1972 {
1973 pr_debug ("%s:%d: assemble_tokens: %s trying opcode 0x%08X\n",
1974 frag_now->fr_file, frag_now->fr_line, opcode->name,
1975 opcode->opcode);
1976
1977 preprocess_operands (opcode, tok, ntok);
1978
1979 found_something = TRUE;
1980 opcode = find_opcode_match (opcode, tok, &ntok, pflags, nflgs, &cpumatch);
1981 if (opcode)
1982 {
1983 struct arc_insn insn;
1984 assemble_insn (opcode, tok, ntok, pflags, nflgs, &insn);
1985 emit_insn (&insn);
1986 return;
1987 }
1988 }
1989
1990 if (found_something)
1991 {
1992 if (cpumatch)
1993 as_bad (_("inappropriate arguments for opcode '%s'"), opname);
1994 else
1995 as_bad (_("opcode '%s' not supported for target %s"), opname,
1996 arc_target_name);
1997 }
1998 else
1999 as_bad (_("unknown opcode '%s'"), opname);
2000 }
2001
2002 /* The public interface to the instruction assembler. */
2003
2004 void
2005 md_assemble (char *str)
2006 {
2007 char *opname;
2008 expressionS tok[MAX_INSN_ARGS];
2009 int ntok, nflg;
2010 size_t opnamelen;
2011 struct arc_flags flags[MAX_INSN_FLGS];
2012
2013 /* Split off the opcode. */
2014 opnamelen = strspn (str, "abcdefghijklmnopqrstuvwxyz_0123468");
2015 opname = xmalloc (opnamelen + 1);
2016 memcpy (opname, str, opnamelen);
2017 opname[opnamelen] = '\0';
2018
2019 /* Signalize we are assmbling the instructions. */
2020 assembling_insn = TRUE;
2021
2022 /* Tokenize the flags. */
2023 if ((nflg = tokenize_flags (str + opnamelen, flags, MAX_INSN_FLGS)) == -1)
2024 {
2025 as_bad (_("syntax error"));
2026 return;
2027 }
2028
2029 /* Scan up to the end of the mnemonic which must end in space or end
2030 of string. */
2031 str += opnamelen;
2032 for (; *str != '\0'; str++)
2033 if (*str == ' ')
2034 break;
2035
2036 /* Tokenize the rest of the line. */
2037 if ((ntok = tokenize_arguments (str, tok, MAX_INSN_ARGS)) < 0)
2038 {
2039 as_bad (_("syntax error"));
2040 return;
2041 }
2042
2043 /* Finish it off. */
2044 assemble_tokens (opname, tok, ntok, flags, nflg);
2045 assembling_insn = FALSE;
2046 }
2047
2048 /* Callback to insert a register into the hash table. */
2049
2050 static void
2051 declare_register (const char *name, int number)
2052 {
2053 const char *err;
2054 symbolS *regS = symbol_create (name, reg_section,
2055 number, &zero_address_frag);
2056
2057 err = hash_insert (arc_reg_hash, S_GET_NAME (regS), (void *) regS);
2058 if (err)
2059 as_fatal ("Inserting \"%s\" into register table failed: %s",
2060 name, err);
2061 }
2062
2063 /* Construct symbols for each of the general registers. */
2064
2065 static void
2066 declare_register_set (void)
2067 {
2068 int i;
2069 for (i = 0; i < 64; ++i)
2070 {
2071 char name[7];
2072
2073 sprintf (name, "r%d", i);
2074 declare_register (name, i);
2075 if ((i & 0x01) == 0)
2076 {
2077 sprintf (name, "r%dr%d", i, i+1);
2078 declare_register (name, i);
2079 }
2080 }
2081 }
2082
2083 /* Port-specific assembler initialization. This function is called
2084 once, at assembler startup time. */
2085
2086 void
2087 md_begin (void)
2088 {
2089 unsigned int i;
2090
2091 /* The endianness can be chosen "at the factory". */
2092 target_big_endian = byte_order == BIG_ENDIAN;
2093
2094 if (!bfd_set_arch_mach (stdoutput, bfd_arch_arc, arc_mach_type))
2095 as_warn (_("could not set architecture and machine"));
2096
2097 /* Set elf header flags. */
2098 bfd_set_private_flags (stdoutput, arc_eflag);
2099
2100 /* Set up a hash table for the instructions. */
2101 arc_opcode_hash = hash_new ();
2102 if (arc_opcode_hash == NULL)
2103 as_fatal (_("Virtual memory exhausted"));
2104
2105 /* Initialize the hash table with the insns. */
2106 for (i = 0; i < arc_num_opcodes;)
2107 {
2108 const char *name, *retval;
2109
2110 name = arc_opcodes[i].name;
2111 retval = hash_insert (arc_opcode_hash, name, (void *) &arc_opcodes[i]);
2112 if (retval)
2113 as_fatal (_("internal error: can't hash opcode '%s': %s"),
2114 name, retval);
2115
2116 while (++i < arc_num_opcodes
2117 && (arc_opcodes[i].name == name
2118 || !strcmp (arc_opcodes[i].name, name)))
2119 continue;
2120 }
2121
2122 /* Register declaration. */
2123 arc_reg_hash = hash_new ();
2124 if (arc_reg_hash == NULL)
2125 as_fatal (_("Virtual memory exhausted"));
2126
2127 declare_register_set ();
2128 declare_register ("gp", 26);
2129 declare_register ("fp", 27);
2130 declare_register ("sp", 28);
2131 declare_register ("ilink", 29);
2132 declare_register ("ilink1", 29);
2133 declare_register ("ilink2", 30);
2134 declare_register ("blink", 31);
2135
2136 declare_register ("mlo", 57);
2137 declare_register ("mmid", 58);
2138 declare_register ("mhi", 59);
2139
2140 declare_register ("acc1", 56);
2141 declare_register ("acc2", 57);
2142
2143 declare_register ("lp_count", 60);
2144 declare_register ("pcl", 63);
2145
2146 /* Initialize the last instructions. */
2147 memset (&arc_last_insns[0], 0, sizeof (arc_last_insns));
2148 }
2149
2150 /* Write a value out to the object file, using the appropriate
2151 endianness. */
2152
2153 void
2154 md_number_to_chars (char *buf,
2155 valueT val,
2156 int n)
2157 {
2158 if (target_big_endian)
2159 number_to_chars_bigendian (buf, val, n);
2160 else
2161 number_to_chars_littleendian (buf, val, n);
2162 }
2163
2164 /* Round up a section size to the appropriate boundary. */
2165
2166 valueT
2167 md_section_align (segT segment,
2168 valueT size)
2169 {
2170 int align = bfd_get_section_alignment (stdoutput, segment);
2171
2172 return ((size + (1 << align) - 1) & (-((valueT) 1 << align)));
2173 }
2174
2175 /* The location from which a PC relative jump should be calculated,
2176 given a PC relative reloc. */
2177
2178 long
2179 md_pcrel_from_section (fixS *fixP,
2180 segT sec)
2181 {
2182 offsetT base = fixP->fx_where + fixP->fx_frag->fr_address;
2183
2184 pr_debug ("pcrel_from_section, fx_offset = %d\n", (int) fixP->fx_offset);
2185
2186 if (fixP->fx_addsy != (symbolS *) NULL
2187 && (!S_IS_DEFINED (fixP->fx_addsy)
2188 || S_GET_SEGMENT (fixP->fx_addsy) != sec))
2189 {
2190 pr_debug ("Unknown pcrel symbol: %s\n", S_GET_NAME (fixP->fx_addsy));
2191
2192 /* The symbol is undefined (or is defined but not in this section).
2193 Let the linker figure it out. */
2194 return 0;
2195 }
2196
2197 if ((int) fixP->fx_r_type < 0)
2198 {
2199 /* These are the "internal" relocations. Align them to
2200 32 bit boundary (PCL), for the moment. */
2201 base &= ~3;
2202 }
2203 else
2204 {
2205 switch (fixP->fx_r_type)
2206 {
2207 case BFD_RELOC_ARC_PC32:
2208 /* The hardware calculates relative to the start of the
2209 insn, but this relocation is relative to location of the
2210 LIMM, compensate. The base always needs to be
2211 substracted by 4 as we do not support this type of PCrel
2212 relocation for short instructions. */
2213 base -= 4;
2214 /* Fall through. */
2215 case BFD_RELOC_ARC_PLT32:
2216 case BFD_RELOC_ARC_S25H_PCREL_PLT:
2217 case BFD_RELOC_ARC_S21H_PCREL_PLT:
2218 case BFD_RELOC_ARC_S25W_PCREL_PLT:
2219 case BFD_RELOC_ARC_S21W_PCREL_PLT:
2220
2221 case BFD_RELOC_ARC_S21H_PCREL:
2222 case BFD_RELOC_ARC_S25H_PCREL:
2223 case BFD_RELOC_ARC_S13_PCREL:
2224 case BFD_RELOC_ARC_S21W_PCREL:
2225 case BFD_RELOC_ARC_S25W_PCREL:
2226 base &= ~3;
2227 break;
2228 default:
2229 as_bad_where (fixP->fx_file, fixP->fx_line,
2230 _("unhandled reloc %s in md_pcrel_from_section"),
2231 bfd_get_reloc_code_name (fixP->fx_r_type));
2232 break;
2233 }
2234 }
2235
2236 pr_debug ("pcrel from %x + %lx = %x, symbol: %s (%x)\n",
2237 fixP->fx_frag->fr_address, fixP->fx_where, base,
2238 fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "(null)",
2239 fixP->fx_addsy ? S_GET_VALUE (fixP->fx_addsy) : 0);
2240
2241 return base;
2242 }
2243
2244 /* Given a BFD relocation find the coresponding operand. */
2245
2246 static const struct arc_operand *
2247 find_operand_for_reloc (extended_bfd_reloc_code_real_type reloc)
2248 {
2249 unsigned i;
2250
2251 for (i = 0; i < arc_num_operands; i++)
2252 if (arc_operands[i].default_reloc == reloc)
2253 return &arc_operands[i];
2254 return NULL;
2255 }
2256
2257 /* Insert an operand value into an instruction. */
2258
2259 static unsigned
2260 insert_operand (unsigned insn,
2261 const struct arc_operand *operand,
2262 offsetT val,
2263 const char *file,
2264 unsigned line)
2265 {
2266 offsetT min = 0, max = 0;
2267
2268 if (operand->bits != 32
2269 && !(operand->flags & ARC_OPERAND_NCHK)
2270 && !(operand->flags & ARC_OPERAND_FAKE))
2271 {
2272 if (operand->flags & ARC_OPERAND_SIGNED)
2273 {
2274 max = (1 << (operand->bits - 1)) - 1;
2275 min = -(1 << (operand->bits - 1));
2276 }
2277 else
2278 {
2279 max = (1 << operand->bits) - 1;
2280 min = 0;
2281 }
2282
2283 if (val < min || val > max)
2284 as_bad_value_out_of_range (_("operand"),
2285 val, min, max, file, line);
2286 }
2287
2288 pr_debug ("insert field: %ld <= %ld <= %ld in 0x%08x\n",
2289 min, val, max, insn);
2290
2291 if ((operand->flags & ARC_OPERAND_ALIGNED32)
2292 && (val & 0x03))
2293 as_bad_where (file, line,
2294 _("Unaligned operand. Needs to be 32bit aligned"));
2295
2296 if ((operand->flags & ARC_OPERAND_ALIGNED16)
2297 && (val & 0x01))
2298 as_bad_where (file, line,
2299 _("Unaligned operand. Needs to be 16bit aligned"));
2300
2301 if (operand->insert)
2302 {
2303 const char *errmsg = NULL;
2304
2305 insn = (*operand->insert) (insn, val, &errmsg);
2306 if (errmsg)
2307 as_warn_where (file, line, "%s", errmsg);
2308 }
2309 else
2310 {
2311 if (operand->flags & ARC_OPERAND_TRUNCATE)
2312 {
2313 if (operand->flags & ARC_OPERAND_ALIGNED32)
2314 val >>= 2;
2315 if (operand->flags & ARC_OPERAND_ALIGNED16)
2316 val >>= 1;
2317 }
2318 insn |= ((val & ((1 << operand->bits) - 1)) << operand->shift);
2319 }
2320 return insn;
2321 }
2322
2323 /* Apply a fixup to the object code. At this point all symbol values
2324 should be fully resolved, and we attempt to completely resolve the
2325 reloc. If we can not do that, we determine the correct reloc code
2326 and put it back in the fixup. To indicate that a fixup has been
2327 eliminated, set fixP->fx_done. */
2328
2329 void
2330 md_apply_fix (fixS *fixP,
2331 valueT *valP,
2332 segT seg)
2333 {
2334 char * const fixpos = fixP->fx_frag->fr_literal + fixP->fx_where;
2335 valueT value = *valP;
2336 unsigned insn = 0;
2337 symbolS *fx_addsy, *fx_subsy;
2338 offsetT fx_offset;
2339 segT add_symbol_segment = absolute_section;
2340 segT sub_symbol_segment = absolute_section;
2341 const struct arc_operand *operand = NULL;
2342 extended_bfd_reloc_code_real_type reloc;
2343
2344 pr_debug ("%s:%u: apply_fix: r_type=%d (%s) value=0x%lX offset=0x%lX\n",
2345 fixP->fx_file, fixP->fx_line, fixP->fx_r_type,
2346 ((int) fixP->fx_r_type < 0) ? "Internal":
2347 bfd_get_reloc_code_name (fixP->fx_r_type), value,
2348 fixP->fx_offset);
2349
2350 fx_addsy = fixP->fx_addsy;
2351 fx_subsy = fixP->fx_subsy;
2352 fx_offset = 0;
2353
2354 if (fx_addsy)
2355 {
2356 add_symbol_segment = S_GET_SEGMENT (fx_addsy);
2357 }
2358
2359 if (fx_subsy
2360 && fixP->fx_r_type != BFD_RELOC_ARC_TLS_DTPOFF
2361 && fixP->fx_r_type != BFD_RELOC_ARC_TLS_DTPOFF_S9
2362 && fixP->fx_r_type != BFD_RELOC_ARC_TLS_GD_LD)
2363 {
2364 resolve_symbol_value (fx_subsy);
2365 sub_symbol_segment = S_GET_SEGMENT (fx_subsy);
2366
2367 if (sub_symbol_segment == absolute_section)
2368 {
2369 /* The symbol is really a constant. */
2370 fx_offset -= S_GET_VALUE (fx_subsy);
2371 fx_subsy = NULL;
2372 }
2373 else
2374 {
2375 as_bad_where (fixP->fx_file, fixP->fx_line,
2376 _("can't resolve `%s' {%s section} - `%s' {%s section}"),
2377 fx_addsy ? S_GET_NAME (fx_addsy) : "0",
2378 segment_name (add_symbol_segment),
2379 S_GET_NAME (fx_subsy),
2380 segment_name (sub_symbol_segment));
2381 return;
2382 }
2383 }
2384
2385 if (fx_addsy
2386 && !S_IS_WEAK (fx_addsy))
2387 {
2388 if (add_symbol_segment == seg
2389 && fixP->fx_pcrel)
2390 {
2391 value += S_GET_VALUE (fx_addsy);
2392 value -= md_pcrel_from_section (fixP, seg);
2393 fx_addsy = NULL;
2394 fixP->fx_pcrel = FALSE;
2395 }
2396 else if (add_symbol_segment == absolute_section)
2397 {
2398 value = fixP->fx_offset;
2399 fx_offset += S_GET_VALUE (fixP->fx_addsy);
2400 fx_addsy = NULL;
2401 fixP->fx_pcrel = FALSE;
2402 }
2403 }
2404
2405 if (!fx_addsy)
2406 fixP->fx_done = TRUE;
2407
2408 if (fixP->fx_pcrel)
2409 {
2410 if (fx_addsy
2411 && ((S_IS_DEFINED (fx_addsy)
2412 && S_GET_SEGMENT (fx_addsy) != seg)
2413 || S_IS_WEAK (fx_addsy)))
2414 value += md_pcrel_from_section (fixP, seg);
2415
2416 switch (fixP->fx_r_type)
2417 {
2418 case BFD_RELOC_ARC_32_ME:
2419 /* This is a pc-relative value in a LIMM. Adjust it to the
2420 address of the instruction not to the address of the
2421 LIMM. Note: it is not anylonger valid this afirmation as
2422 the linker consider ARC_PC32 a fixup to entire 64 bit
2423 insn. */
2424 fixP->fx_offset += fixP->fx_frag->fr_address;
2425 /* Fall through. */
2426 case BFD_RELOC_32:
2427 fixP->fx_r_type = BFD_RELOC_ARC_PC32;
2428 /* Fall through. */
2429 case BFD_RELOC_ARC_PC32:
2430 /* fixP->fx_offset += fixP->fx_where - fixP->fx_dot_value; */
2431 break;
2432 default:
2433 if ((int) fixP->fx_r_type < 0)
2434 as_fatal (_("PC relative relocation not allowed for (internal) type %d"),
2435 fixP->fx_r_type);
2436 break;
2437 }
2438 }
2439
2440 pr_debug ("%s:%u: apply_fix: r_type=%d (%s) value=0x%lX offset=0x%lX\n",
2441 fixP->fx_file, fixP->fx_line, fixP->fx_r_type,
2442 ((int) fixP->fx_r_type < 0) ? "Internal":
2443 bfd_get_reloc_code_name (fixP->fx_r_type), value,
2444 fixP->fx_offset);
2445
2446
2447 /* Now check for TLS relocations. */
2448 reloc = fixP->fx_r_type;
2449 switch (reloc)
2450 {
2451 case BFD_RELOC_ARC_TLS_DTPOFF:
2452 case BFD_RELOC_ARC_TLS_LE_32:
2453 if (fixP->fx_done)
2454 break;
2455 /* Fall through. */
2456 case BFD_RELOC_ARC_TLS_GD_GOT:
2457 case BFD_RELOC_ARC_TLS_IE_GOT:
2458 S_SET_THREAD_LOCAL (fixP->fx_addsy);
2459 break;
2460
2461 case BFD_RELOC_ARC_TLS_GD_LD:
2462 gas_assert (!fixP->fx_offset);
2463 if (fixP->fx_subsy)
2464 fixP->fx_offset
2465 = (S_GET_VALUE (fixP->fx_subsy)
2466 - fixP->fx_frag->fr_address- fixP->fx_where);
2467 fixP->fx_subsy = NULL;
2468 /* Fall through. */
2469 case BFD_RELOC_ARC_TLS_GD_CALL:
2470 /* These two relocs are there just to allow ld to change the tls
2471 model for this symbol, by patching the code. The offset -
2472 and scale, if any - will be installed by the linker. */
2473 S_SET_THREAD_LOCAL (fixP->fx_addsy);
2474 break;
2475
2476 case BFD_RELOC_ARC_TLS_LE_S9:
2477 case BFD_RELOC_ARC_TLS_DTPOFF_S9:
2478 as_bad (_("TLS_*_S9 relocs are not supported yet"));
2479 break;
2480
2481 default:
2482 break;
2483 }
2484
2485 if (!fixP->fx_done)
2486 {
2487 return;
2488 }
2489
2490 /* Addjust the value if we have a constant. */
2491 value += fx_offset;
2492
2493 /* For hosts with longs bigger than 32-bits make sure that the top
2494 bits of a 32-bit negative value read in by the parser are set,
2495 so that the correct comparisons are made. */
2496 if (value & 0x80000000)
2497 value |= (-1L << 31);
2498
2499 reloc = fixP->fx_r_type;
2500 switch (reloc)
2501 {
2502 case BFD_RELOC_8:
2503 case BFD_RELOC_16:
2504 case BFD_RELOC_24:
2505 case BFD_RELOC_32:
2506 case BFD_RELOC_64:
2507 case BFD_RELOC_ARC_32_PCREL:
2508 md_number_to_chars (fixpos, value, fixP->fx_size);
2509 return;
2510
2511 case BFD_RELOC_ARC_GOTPC32:
2512 /* I cannot fix an GOTPC relocation because I need to relax it
2513 from ld rx,[pcl,@sym@gotpc] to add rx,pcl,@sym@gotpc. */
2514 as_bad (_("Unsupported operation on reloc"));
2515 return;
2516
2517 case BFD_RELOC_ARC_TLS_DTPOFF:
2518 case BFD_RELOC_ARC_TLS_LE_32:
2519 gas_assert (!fixP->fx_addsy);
2520 gas_assert (!fixP->fx_subsy);
2521
2522 case BFD_RELOC_ARC_GOTOFF:
2523 case BFD_RELOC_ARC_32_ME:
2524 case BFD_RELOC_ARC_PC32:
2525 md_number_to_chars_midend (fixpos, value, fixP->fx_size);
2526 return;
2527
2528 case BFD_RELOC_ARC_PLT32:
2529 md_number_to_chars_midend (fixpos, value, fixP->fx_size);
2530 return;
2531
2532 case BFD_RELOC_ARC_S25H_PCREL_PLT:
2533 reloc = BFD_RELOC_ARC_S25W_PCREL;
2534 goto solve_plt;
2535
2536 case BFD_RELOC_ARC_S21H_PCREL_PLT:
2537 reloc = BFD_RELOC_ARC_S21H_PCREL;
2538 goto solve_plt;
2539
2540 case BFD_RELOC_ARC_S25W_PCREL_PLT:
2541 reloc = BFD_RELOC_ARC_S25W_PCREL;
2542 goto solve_plt;
2543
2544 case BFD_RELOC_ARC_S21W_PCREL_PLT:
2545 reloc = BFD_RELOC_ARC_S21W_PCREL;
2546
2547 case BFD_RELOC_ARC_S25W_PCREL:
2548 case BFD_RELOC_ARC_S21W_PCREL:
2549 case BFD_RELOC_ARC_S21H_PCREL:
2550 case BFD_RELOC_ARC_S25H_PCREL:
2551 case BFD_RELOC_ARC_S13_PCREL:
2552 solve_plt:
2553 operand = find_operand_for_reloc (reloc);
2554 gas_assert (operand);
2555 break;
2556
2557 default:
2558 {
2559 if ((int) fixP->fx_r_type >= 0)
2560 as_fatal (_("unhandled relocation type %s"),
2561 bfd_get_reloc_code_name (fixP->fx_r_type));
2562
2563 /* The rest of these fixups needs to be completely resolved as
2564 constants. */
2565 if (fixP->fx_addsy != 0
2566 && S_GET_SEGMENT (fixP->fx_addsy) != absolute_section)
2567 as_bad_where (fixP->fx_file, fixP->fx_line,
2568 _("non-absolute expression in constant field"));
2569
2570 gas_assert (-(int) fixP->fx_r_type < (int) arc_num_operands);
2571 operand = &arc_operands[-(int) fixP->fx_r_type];
2572 break;
2573 }
2574 }
2575
2576 if (target_big_endian)
2577 {
2578 switch (fixP->fx_size)
2579 {
2580 case 4:
2581 insn = bfd_getb32 (fixpos);
2582 break;
2583 case 2:
2584 insn = bfd_getb16 (fixpos);
2585 break;
2586 default:
2587 as_bad_where (fixP->fx_file, fixP->fx_line,
2588 _("unknown fixup size"));
2589 }
2590 }
2591 else
2592 {
2593 insn = 0;
2594 switch (fixP->fx_size)
2595 {
2596 case 4:
2597 insn = bfd_getl16 (fixpos) << 16 | bfd_getl16 (fixpos + 2);
2598 break;
2599 case 2:
2600 insn = bfd_getl16 (fixpos);
2601 break;
2602 default:
2603 as_bad_where (fixP->fx_file, fixP->fx_line,
2604 _("unknown fixup size"));
2605 }
2606 }
2607
2608 insn = insert_operand (insn, operand, (offsetT) value,
2609 fixP->fx_file, fixP->fx_line);
2610
2611 md_number_to_chars_midend (fixpos, insn, fixP->fx_size);
2612 }
2613
2614 /* Prepare machine-dependent frags for relaxation.
2615
2616 Called just before relaxation starts. Any symbol that is now undefined
2617 will not become defined.
2618
2619 Return the correct fr_subtype in the frag.
2620
2621 Return the initial "guess for fr_var" to caller. The guess for fr_var
2622 is *actually* the growth beyond fr_fix. Whatever we do to grow fr_fix
2623 or fr_var contributes to our returned value.
2624
2625 Although it may not be explicit in the frag, pretend
2626 fr_var starts with a value. */
2627
2628 int
2629 md_estimate_size_before_relax (fragS *fragP,
2630 segT segment)
2631 {
2632 int growth;
2633
2634 /* If the symbol is not located within the same section AND it's not
2635 an absolute section, use the maximum. OR if the symbol is a
2636 constant AND the insn is by nature not pc-rel, use the maximum.
2637 OR if the symbol is being equated against another symbol, use the
2638 maximum. OR if the symbol is weak use the maximum. */
2639 if ((S_GET_SEGMENT (fragP->fr_symbol) != segment
2640 && S_GET_SEGMENT (fragP->fr_symbol) != absolute_section)
2641 || (symbol_constant_p (fragP->fr_symbol)
2642 && !fragP->tc_frag_data.pcrel)
2643 || symbol_equated_p (fragP->fr_symbol)
2644 || S_IS_WEAK (fragP->fr_symbol))
2645 {
2646 while (md_relax_table[fragP->fr_subtype].rlx_more != ARC_RLX_NONE)
2647 ++fragP->fr_subtype;
2648 }
2649
2650 growth = md_relax_table[fragP->fr_subtype].rlx_length;
2651 fragP->fr_var = growth;
2652
2653 pr_debug ("%s:%d: md_estimate_size_before_relax: %d\n",
2654 fragP->fr_file, fragP->fr_line, growth);
2655
2656 return growth;
2657 }
2658
2659 /* Translate internal representation of relocation info to BFD target
2660 format. */
2661
2662 arelent *
2663 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED,
2664 fixS *fixP)
2665 {
2666 arelent *reloc;
2667 bfd_reloc_code_real_type code;
2668
2669 reloc = (arelent *) xmalloc (sizeof (* reloc));
2670 reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
2671 *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy);
2672 reloc->address = fixP->fx_frag->fr_address + fixP->fx_where;
2673
2674 /* Make sure none of our internal relocations make it this far.
2675 They'd better have been fully resolved by this point. */
2676 gas_assert ((int) fixP->fx_r_type > 0);
2677
2678 code = fixP->fx_r_type;
2679
2680 /* if we have something like add gp, pcl,
2681 _GLOBAL_OFFSET_TABLE_@gotpc. */
2682 if (code == BFD_RELOC_ARC_GOTPC32
2683 && GOT_symbol
2684 && fixP->fx_addsy == GOT_symbol)
2685 code = BFD_RELOC_ARC_GOTPC;
2686
2687 reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
2688 if (reloc->howto == NULL)
2689 {
2690 as_bad_where (fixP->fx_file, fixP->fx_line,
2691 _("cannot represent `%s' relocation in object file"),
2692 bfd_get_reloc_code_name (code));
2693 return NULL;
2694 }
2695
2696 if (!fixP->fx_pcrel != !reloc->howto->pc_relative)
2697 as_fatal (_("internal error? cannot generate `%s' relocation"),
2698 bfd_get_reloc_code_name (code));
2699
2700 gas_assert (!fixP->fx_pcrel == !reloc->howto->pc_relative);
2701
2702 if (code == BFD_RELOC_ARC_TLS_DTPOFF
2703 || code == BFD_RELOC_ARC_TLS_DTPOFF_S9)
2704 {
2705 asymbol *sym
2706 = fixP->fx_subsy ? symbol_get_bfdsym (fixP->fx_subsy) : NULL;
2707 /* We just want to store a 24 bit index, but we have to wait
2708 till after write_contents has been called via
2709 bfd_map_over_sections before we can get the index from
2710 _bfd_elf_symbol_from_bfd_symbol. Thus, the write_relocs
2711 function is elf32-arc.c has to pick up the slack.
2712 Unfortunately, this leads to problems with hosts that have
2713 pointers wider than long (bfd_vma). There would be various
2714 ways to handle this, all error-prone :-( */
2715 reloc->addend = (bfd_vma) sym;
2716 if ((asymbol *) reloc->addend != sym)
2717 {
2718 as_bad ("Can't store pointer\n");
2719 return NULL;
2720 }
2721 }
2722 else
2723 reloc->addend = fixP->fx_offset;
2724
2725 return reloc;
2726 }
2727
2728 /* Perform post-processing of machine-dependent frags after relaxation.
2729 Called after relaxation is finished.
2730 In: Address of frag.
2731 fr_type == rs_machine_dependent.
2732 fr_subtype is what the address relaxed to.
2733
2734 Out: Any fixS:s and constants are set up. */
2735
2736 void
2737 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
2738 segT segment ATTRIBUTE_UNUSED,
2739 fragS *fragP)
2740 {
2741 const relax_typeS *table_entry;
2742 char *dest;
2743 const struct arc_opcode *opcode;
2744 struct arc_insn insn;
2745 int size, fix;
2746 struct arc_relax_type *relax_arg = &fragP->tc_frag_data;
2747
2748 fix = (fragP->fr_fix < 0 ? 0 : fragP->fr_fix);
2749 dest = fragP->fr_literal + fix;
2750 table_entry = TC_GENERIC_RELAX_TABLE + fragP->fr_subtype;
2751
2752 pr_debug ("%s:%d: md_convert_frag, subtype: %d, fix: %d, var: %d\n",
2753 fragP->fr_file, fragP->fr_line,
2754 fragP->fr_subtype, fix, fragP->fr_var);
2755
2756 if (fragP->fr_subtype <= 0
2757 && fragP->fr_subtype >= arc_num_relax_opcodes)
2758 as_fatal (_("no relaxation found for this instruction."));
2759
2760 opcode = &arc_relax_opcodes[fragP->fr_subtype];
2761
2762 assemble_insn (opcode, relax_arg->tok, relax_arg->ntok, relax_arg->pflags,
2763 relax_arg->nflg, &insn);
2764
2765 apply_fixups (&insn, fragP, fix);
2766
2767 size = insn.short_insn ? (insn.has_limm ? 6 : 2) : (insn.has_limm ? 8 : 4);
2768 gas_assert (table_entry->rlx_length == size);
2769 emit_insn0 (&insn, dest, TRUE);
2770
2771 fragP->fr_fix += table_entry->rlx_length;
2772 fragP->fr_var = 0;
2773 }
2774
2775 /* We have no need to default values of symbols. We could catch
2776 register names here, but that is handled by inserting them all in
2777 the symbol table to begin with. */
2778
2779 symbolS *
2780 md_undefined_symbol (char *name)
2781 {
2782 /* The arc abi demands that a GOT[0] should be referencible as
2783 [pc+_DYNAMIC@gotpc]. Hence we convert a _DYNAMIC@gotpc to a
2784 GOTPC reference to _GLOBAL_OFFSET_TABLE_. */
2785 if (((*name == '_')
2786 && (*(name+1) == 'G')
2787 && (strcmp (name, GLOBAL_OFFSET_TABLE_NAME) == 0))
2788 || ((*name == '_')
2789 && (*(name+1) == 'D')
2790 && (strcmp (name, DYNAMIC_STRUCT_NAME) == 0)))
2791 {
2792 if (!GOT_symbol)
2793 {
2794 if (symbol_find (name))
2795 as_bad ("GOT already in symbol table");
2796
2797 GOT_symbol = symbol_new (GLOBAL_OFFSET_TABLE_NAME, undefined_section,
2798 (valueT) 0, &zero_address_frag);
2799 };
2800 return GOT_symbol;
2801 }
2802 return NULL;
2803 }
2804
2805 /* Turn a string in input_line_pointer into a floating point constant
2806 of type type, and store the appropriate bytes in *litP. The number
2807 of LITTLENUMS emitted is stored in *sizeP. An error message is
2808 returned, or NULL on OK. */
2809
2810 char *
2811 md_atof (int type, char *litP, int *sizeP)
2812 {
2813 return ieee_md_atof (type, litP, sizeP, target_big_endian);
2814 }
2815
2816 /* Called for any expression that can not be recognized. When the
2817 function is called, `input_line_pointer' will point to the start of
2818 the expression. */
2819
2820 void
2821 md_operand (expressionS *expressionP ATTRIBUTE_UNUSED)
2822 {
2823 char *p = input_line_pointer;
2824 if (*p == '@')
2825 {
2826 input_line_pointer++;
2827 expressionP->X_op = O_symbol;
2828 expression (expressionP);
2829 }
2830 }
2831
2832 /* This function is called from the function 'expression', it attempts
2833 to parse special names (in our case register names). It fills in
2834 the expression with the identified register. It returns TRUE if
2835 it is a register and FALSE otherwise. */
2836
2837 bfd_boolean
2838 arc_parse_name (const char *name,
2839 struct expressionS *e)
2840 {
2841 struct symbol *sym;
2842
2843 if (!assembling_insn)
2844 return FALSE;
2845
2846 /* Handle only registers. */
2847 if (e->X_op != O_absent)
2848 return FALSE;
2849
2850 sym = hash_find (arc_reg_hash, name);
2851 if (sym)
2852 {
2853 e->X_op = O_register;
2854 e->X_add_number = S_GET_VALUE (sym);
2855 return TRUE;
2856 }
2857 return FALSE;
2858 }
2859
2860 /* md_parse_option
2861 Invocation line includes a switch not recognized by the base assembler.
2862 See if it's a processor-specific option.
2863
2864 New options (supported) are:
2865
2866 -mcpu=<cpu name> Assemble for selected processor
2867 -EB/-mbig-endian Big-endian
2868 -EL/-mlittle-endian Little-endian
2869 -mrelax Enable relaxation
2870
2871 The following CPU names are recognized:
2872 arc700, av2em, av2hs. */
2873
2874 int
2875 md_parse_option (int c, char *arg ATTRIBUTE_UNUSED)
2876 {
2877 int cpu_flags = EF_ARC_CPU_GENERIC;
2878
2879 switch (c)
2880 {
2881 case OPTION_ARC600:
2882 case OPTION_ARC601:
2883 return md_parse_option (OPTION_MCPU, "arc600");
2884
2885 case OPTION_ARC700:
2886 return md_parse_option (OPTION_MCPU, "arc700");
2887
2888 case OPTION_ARCEM:
2889 return md_parse_option (OPTION_MCPU, "arcem");
2890
2891 case OPTION_ARCHS:
2892 return md_parse_option (OPTION_MCPU, "archs");
2893
2894 case OPTION_MCPU:
2895 {
2896 int i;
2897 char *s = alloca (strlen (arg) + 1);
2898
2899 {
2900 char *t = s;
2901 char *arg1 = arg;
2902
2903 do
2904 *t = TOLOWER (*arg1++);
2905 while (*t++);
2906 }
2907
2908 for (i = 0; cpu_types[i].name; ++i)
2909 {
2910 if (!strcmp (cpu_types[i].name, s))
2911 {
2912 arc_target = cpu_types[i].flags;
2913 arc_target_name = cpu_types[i].name;
2914 arc_features = cpu_types[i].features;
2915 arc_mach_type = cpu_types[i].mach;
2916 cpu_flags = cpu_types[i].eflags;
2917
2918 mach_type_specified_p = 1;
2919 break;
2920 }
2921 }
2922
2923 if (!cpu_types[i].name)
2924 {
2925 as_fatal (_("unknown architecture: %s\n"), arg);
2926 }
2927 break;
2928 }
2929
2930 case OPTION_EB:
2931 arc_target_format = "elf32-bigarc";
2932 byte_order = BIG_ENDIAN;
2933 break;
2934
2935 case OPTION_EL:
2936 arc_target_format = "elf32-littlearc";
2937 byte_order = LITTLE_ENDIAN;
2938 break;
2939
2940 case OPTION_CD:
2941 /* This option has an effect only on ARC EM. */
2942 if (arc_target & ARC_OPCODE_ARCv2EM)
2943 arc_features |= ARC_CD;
2944 break;
2945
2946 case OPTION_RELAX:
2947 relaxation_state = 1;
2948 break;
2949
2950 case OPTION_USER_MODE:
2951 case OPTION_LD_EXT_MASK:
2952 case OPTION_SWAP:
2953 case OPTION_NORM:
2954 case OPTION_BARREL_SHIFT:
2955 case OPTION_MIN_MAX:
2956 case OPTION_NO_MPY:
2957 case OPTION_EA:
2958 case OPTION_MUL64:
2959 case OPTION_SIMD:
2960 case OPTION_SPFP:
2961 case OPTION_DPFP:
2962 case OPTION_XMAC_D16:
2963 case OPTION_XMAC_24:
2964 case OPTION_DSP_PACKA:
2965 case OPTION_CRC:
2966 case OPTION_DVBF:
2967 case OPTION_TELEPHONY:
2968 case OPTION_XYMEMORY:
2969 case OPTION_LOCK:
2970 case OPTION_SWAPE:
2971 case OPTION_RTSC:
2972 case OPTION_FPUDA:
2973 /* Dummy options are accepted but have no effect. */
2974 break;
2975
2976 default:
2977 return 0;
2978 }
2979
2980 if (cpu_flags != EF_ARC_CPU_GENERIC)
2981 arc_eflag = (arc_eflag & ~EF_ARC_MACH_MSK) | cpu_flags;
2982
2983 return 1;
2984 }
2985
2986 void
2987 md_show_usage (FILE *stream)
2988 {
2989 fprintf (stream, _("ARC-specific assembler options:\n"));
2990
2991 fprintf (stream, " -mcpu=<cpu name>\t assemble for CPU <cpu name>\n");
2992 fprintf (stream,
2993 " -mcode-density\t enable code density option for ARC EM\n");
2994
2995 fprintf (stream, _("\
2996 -EB assemble code for a big-endian cpu\n"));
2997 fprintf (stream, _("\
2998 -EL assemble code for a little-endian cpu\n"));
2999 fprintf (stream, _("\
3000 -mrelax Enable relaxation\n"));
3001
3002 }
3003
3004 /* Find the proper relocation for the given opcode. */
3005
3006 static extended_bfd_reloc_code_real_type
3007 find_reloc (const char *name,
3008 const char *opcodename,
3009 const struct arc_flags *pflags,
3010 int nflg,
3011 extended_bfd_reloc_code_real_type reloc)
3012 {
3013 unsigned int i;
3014 int j;
3015 bfd_boolean found_flag, tmp;
3016 extended_bfd_reloc_code_real_type ret = BFD_RELOC_UNUSED;
3017
3018 for (i = 0; i < arc_num_equiv_tab; i++)
3019 {
3020 const struct arc_reloc_equiv_tab *r = &arc_reloc_equiv[i];
3021
3022 /* Find the entry. */
3023 if (strcmp (name, r->name))
3024 continue;
3025 if (r->mnemonic && (strcmp (r->mnemonic, opcodename)))
3026 continue;
3027 if (r->flags[0])
3028 {
3029 if (!nflg)
3030 continue;
3031 found_flag = FALSE;
3032 unsigned * psflg = (unsigned *)r->flags;
3033 do
3034 {
3035 tmp = FALSE;
3036 for (j = 0; j < nflg; j++)
3037 if (!strcmp (pflags[j].name,
3038 arc_flag_operands[*psflg].name))
3039 {
3040 tmp = TRUE;
3041 break;
3042 }
3043 if (!tmp)
3044 {
3045 found_flag = FALSE;
3046 break;
3047 }
3048 else
3049 {
3050 found_flag = TRUE;
3051 }
3052 ++ psflg;
3053 } while (*psflg);
3054
3055 if (!found_flag)
3056 continue;
3057 }
3058
3059 if (reloc != r->oldreloc)
3060 continue;
3061 /* Found it. */
3062 ret = r->newreloc;
3063 break;
3064 }
3065
3066 if (ret == BFD_RELOC_UNUSED)
3067 as_bad (_("Unable to find %s relocation for instruction %s"),
3068 name, opcodename);
3069 return ret;
3070 }
3071
3072 /* All the symbol types that are allowed to be used for
3073 relaxation. */
3074
3075 static bfd_boolean
3076 may_relax_expr (expressionS tok)
3077 {
3078 /* Check if we have unrelaxable relocs. */
3079 switch (tok.X_md)
3080 {
3081 default:
3082 break;
3083 case O_plt:
3084 return FALSE;
3085 }
3086
3087 switch (tok.X_op)
3088 {
3089 case O_symbol:
3090 case O_multiply:
3091 case O_divide:
3092 case O_modulus:
3093 case O_add:
3094 case O_subtract:
3095 break;
3096
3097 default:
3098 return FALSE;
3099 }
3100 return TRUE;
3101 }
3102
3103 /* Checks if flags are in line with relaxable insn. */
3104
3105 static bfd_boolean
3106 relaxable_flag (const struct arc_relaxable_ins *ins,
3107 const struct arc_flags *pflags,
3108 int nflgs)
3109 {
3110 unsigned flag_class,
3111 flag,
3112 flag_class_idx = 0,
3113 flag_idx = 0;
3114
3115 const struct arc_flag_operand *flag_opand;
3116 int i, counttrue = 0;
3117
3118 /* Iterate through flags classes. */
3119 while ((flag_class = ins->flag_classes[flag_class_idx]) != 0)
3120 {
3121 /* Iterate through flags in flag class. */
3122 while ((flag = arc_flag_classes[flag_class].flags[flag_idx])
3123 != 0)
3124 {
3125 flag_opand = &arc_flag_operands[flag];
3126 /* Iterate through flags in ins to compare. */
3127 for (i = 0; i < nflgs; ++i)
3128 {
3129 if (strcmp (flag_opand->name, pflags[i].name) == 0)
3130 ++counttrue;
3131 }
3132
3133 ++flag_idx;
3134 }
3135
3136 ++flag_class_idx;
3137 flag_idx = 0;
3138 }
3139
3140 /* If counttrue == nflgs, then all flags have been found. */
3141 return (counttrue == nflgs ? TRUE : FALSE);
3142 }
3143
3144 /* Checks if operands are in line with relaxable insn. */
3145
3146 static bfd_boolean
3147 relaxable_operand (const struct arc_relaxable_ins *ins,
3148 const expressionS *tok,
3149 int ntok)
3150 {
3151 const enum rlx_operand_type *operand = &ins->operands[0];
3152 int i = 0;
3153
3154 while (*operand != EMPTY)
3155 {
3156 const expressionS *epr = &tok[i];
3157
3158 if (i != 0 && i >= ntok)
3159 return FALSE;
3160
3161 switch (*operand)
3162 {
3163 case IMMEDIATE:
3164 if (!(epr->X_op == O_multiply
3165 || epr->X_op == O_divide
3166 || epr->X_op == O_modulus
3167 || epr->X_op == O_add
3168 || epr->X_op == O_subtract
3169 || epr->X_op == O_symbol))
3170 return FALSE;
3171 break;
3172
3173 case REGISTER_DUP:
3174 if ((i <= 0)
3175 || (epr->X_add_number != tok[i - 1].X_add_number))
3176 return FALSE;
3177 /* Fall through. */
3178 case REGISTER:
3179 if (epr->X_op != O_register)
3180 return FALSE;
3181 break;
3182
3183 case REGISTER_S:
3184 if (epr->X_op != O_register)
3185 return FALSE;
3186
3187 switch (epr->X_add_number)
3188 {
3189 case 0: case 1: case 2: case 3:
3190 case 12: case 13: case 14: case 15:
3191 break;
3192 default:
3193 return FALSE;
3194 }
3195 break;
3196
3197 case REGISTER_NO_GP:
3198 if ((epr->X_op != O_register)
3199 || (epr->X_add_number == 26)) /* 26 is the gp register. */
3200 return FALSE;
3201 break;
3202
3203 case BRACKET:
3204 if (epr->X_op != O_bracket)
3205 return FALSE;
3206 break;
3207
3208 default:
3209 /* Don't understand, bail out. */
3210 return FALSE;
3211 break;
3212 }
3213
3214 ++i;
3215 operand = &ins->operands[i];
3216 }
3217
3218 return (i == ntok ? TRUE : FALSE);
3219 }
3220
3221 /* Return TRUE if this OPDCODE is a candidate for relaxation. */
3222
3223 static bfd_boolean
3224 relax_insn_p (const struct arc_opcode *opcode,
3225 const expressionS *tok,
3226 int ntok,
3227 const struct arc_flags *pflags,
3228 int nflg)
3229 {
3230 unsigned i;
3231 bfd_boolean rv = FALSE;
3232
3233 /* Check the relaxation table. */
3234 for (i = 0; i < arc_num_relaxable_ins && relaxation_state; ++i)
3235 {
3236 const struct arc_relaxable_ins *arc_rlx_ins = &arc_relaxable_insns[i];
3237
3238 if ((strcmp (opcode->name, arc_rlx_ins->mnemonic_r) == 0)
3239 && may_relax_expr (tok[arc_rlx_ins->opcheckidx])
3240 && relaxable_operand (arc_rlx_ins, tok, ntok)
3241 && relaxable_flag (arc_rlx_ins, pflags, nflg))
3242 {
3243 rv = TRUE;
3244 frag_now->fr_subtype = arc_relaxable_insns[i].subtype;
3245 memcpy (&frag_now->tc_frag_data.tok, tok,
3246 sizeof (expressionS) * ntok);
3247 memcpy (&frag_now->tc_frag_data.pflags, pflags,
3248 sizeof (struct arc_flags) * nflg);
3249 frag_now->tc_frag_data.nflg = nflg;
3250 frag_now->tc_frag_data.ntok = ntok;
3251 break;
3252 }
3253 }
3254
3255 return rv;
3256 }
3257
3258 /* Turn an opcode description and a set of arguments into
3259 an instruction and a fixup. */
3260
3261 static void
3262 assemble_insn (const struct arc_opcode *opcode,
3263 const expressionS *tok,
3264 int ntok,
3265 const struct arc_flags *pflags,
3266 int nflg,
3267 struct arc_insn *insn)
3268 {
3269 const expressionS *reloc_exp = NULL;
3270 unsigned image;
3271 const unsigned char *argidx;
3272 int i;
3273 int tokidx = 0;
3274 unsigned char pcrel = 0;
3275 bfd_boolean needGOTSymbol;
3276 bfd_boolean has_delay_slot = FALSE;
3277 extended_bfd_reloc_code_real_type reloc = BFD_RELOC_UNUSED;
3278
3279 memset (insn, 0, sizeof (*insn));
3280 image = opcode->opcode;
3281
3282 pr_debug ("%s:%d: assemble_insn: %s using opcode %x\n",
3283 frag_now->fr_file, frag_now->fr_line, opcode->name,
3284 opcode->opcode);
3285
3286 /* Handle operands. */
3287 for (argidx = opcode->operands; *argidx; ++argidx)
3288 {
3289 const struct arc_operand *operand = &arc_operands[*argidx];
3290 const expressionS *t = (const expressionS *) 0;
3291
3292 if ((operand->flags & ARC_OPERAND_FAKE)
3293 && !(operand->flags & ARC_OPERAND_BRAKET))
3294 continue;
3295
3296 if (operand->flags & ARC_OPERAND_DUPLICATE)
3297 {
3298 /* Duplicate operand, already inserted. */
3299 tokidx ++;
3300 continue;
3301 }
3302
3303 if (tokidx >= ntok)
3304 {
3305 abort ();
3306 }
3307 else
3308 t = &tok[tokidx++];
3309
3310 /* Regardless if we have a reloc or not mark the instruction
3311 limm if it is the case. */
3312 if (operand->flags & ARC_OPERAND_LIMM)
3313 insn->has_limm = TRUE;
3314
3315 switch (t->X_op)
3316 {
3317 case O_register:
3318 image = insert_operand (image, operand, regno (t->X_add_number),
3319 NULL, 0);
3320 break;
3321
3322 case O_constant:
3323 image = insert_operand (image, operand, t->X_add_number, NULL, 0);
3324 reloc_exp = t;
3325 if (operand->flags & ARC_OPERAND_LIMM)
3326 insn->limm = t->X_add_number;
3327 break;
3328
3329 case O_bracket:
3330 /* Ignore brackets. */
3331 break;
3332
3333 case O_absent:
3334 gas_assert (operand->flags & ARC_OPERAND_IGNORE);
3335 break;
3336
3337 case O_subtract:
3338 /* Maybe register range. */
3339 if ((t->X_add_number == 0)
3340 && contains_register (t->X_add_symbol)
3341 && contains_register (t->X_op_symbol))
3342 {
3343 int regs;
3344
3345 regs = get_register (t->X_add_symbol);
3346 regs <<= 16;
3347 regs |= get_register (t->X_op_symbol);
3348 image = insert_operand (image, operand, regs, NULL, 0);
3349 break;
3350 }
3351
3352 default:
3353 /* This operand needs a relocation. */
3354 needGOTSymbol = FALSE;
3355
3356 switch (t->X_md)
3357 {
3358 case O_plt:
3359 needGOTSymbol = TRUE;
3360 reloc = find_reloc ("plt", opcode->name,
3361 pflags, nflg,
3362 operand->default_reloc);
3363 break;
3364
3365 case O_gotoff:
3366 case O_gotpc:
3367 needGOTSymbol = TRUE;
3368 reloc = ARC_RELOC_TABLE (t->X_md)->reloc;
3369 break;
3370 case O_pcl:
3371 reloc = ARC_RELOC_TABLE (t->X_md)->reloc;
3372 if (ARC_SHORT (opcode->mask))
3373 as_bad_where (frag_now->fr_file, frag_now->fr_line,
3374 _("Unable to use @pcl relocation for insn %s"),
3375 opcode->name);
3376 break;
3377 case O_sda:
3378 reloc = find_reloc ("sda", opcode->name,
3379 pflags, nflg,
3380 operand->default_reloc);
3381 break;
3382 case O_tlsgd:
3383 case O_tlsie:
3384 needGOTSymbol = TRUE;
3385 /* Fall-through. */
3386
3387 case O_tpoff:
3388 case O_dtpoff:
3389 reloc = ARC_RELOC_TABLE (t->X_md)->reloc;
3390 break;
3391
3392 case O_tpoff9: /*FIXME! Check for the conditionality of
3393 the insn. */
3394 case O_dtpoff9: /*FIXME! Check for the conditionality of
3395 the insn. */
3396 as_bad (_("TLS_*_S9 relocs are not supported yet"));
3397 break;
3398
3399 default:
3400 /* Just consider the default relocation. */
3401 reloc = operand->default_reloc;
3402 break;
3403 }
3404
3405 if (needGOTSymbol && (GOT_symbol == NULL))
3406 GOT_symbol = symbol_find_or_make (GLOBAL_OFFSET_TABLE_NAME);
3407
3408 reloc_exp = t;
3409
3410 #if 0
3411 if (reloc > 0)
3412 {
3413 /* sanity checks. */
3414 reloc_howto_type *reloc_howto
3415 = bfd_reloc_type_lookup (stdoutput,
3416 (bfd_reloc_code_real_type) reloc);
3417 unsigned reloc_bitsize = reloc_howto->bitsize;
3418 if (reloc_howto->rightshift)
3419 reloc_bitsize -= reloc_howto->rightshift;
3420 if (reloc_bitsize != operand->bits)
3421 {
3422 as_bad (_("invalid relocation %s for field"),
3423 bfd_get_reloc_code_name (reloc));
3424 return;
3425 }
3426 }
3427 #endif
3428 if (insn->nfixups >= MAX_INSN_FIXUPS)
3429 as_fatal (_("too many fixups"));
3430
3431 struct arc_fixup *fixup;
3432 fixup = &insn->fixups[insn->nfixups++];
3433 fixup->exp = *t;
3434 fixup->reloc = reloc;
3435 pcrel = (operand->flags & ARC_OPERAND_PCREL) ? 1 : 0;
3436 fixup->pcrel = pcrel;
3437 fixup->islong = (operand->flags & ARC_OPERAND_LIMM) ?
3438 TRUE : FALSE;
3439 break;
3440 }
3441 }
3442
3443 /* Handle flags. */
3444 for (i = 0; i < nflg; i++)
3445 {
3446 const struct arc_flag_operand *flg_operand =
3447 &arc_flag_operands[pflags[i].code];
3448
3449 /* Check if the instruction has a delay slot. */
3450 if (!strcmp (flg_operand->name, "d"))
3451 has_delay_slot = TRUE;
3452
3453 /* There is an exceptional case when we cannot insert a flag
3454 just as it is. The .T flag must be handled in relation with
3455 the relative address. */
3456 if (!strcmp (flg_operand->name, "t")
3457 || !strcmp (flg_operand->name, "nt"))
3458 {
3459 unsigned bitYoperand = 0;
3460 /* FIXME! move selection bbit/brcc in arc-opc.c. */
3461 if (!strcmp (flg_operand->name, "t"))
3462 if (!strcmp (opcode->name, "bbit0")
3463 || !strcmp (opcode->name, "bbit1"))
3464 bitYoperand = arc_NToperand;
3465 else
3466 bitYoperand = arc_Toperand;
3467 else
3468 if (!strcmp (opcode->name, "bbit0")
3469 || !strcmp (opcode->name, "bbit1"))
3470 bitYoperand = arc_Toperand;
3471 else
3472 bitYoperand = arc_NToperand;
3473
3474 gas_assert (reloc_exp != NULL);
3475 if (reloc_exp->X_op == O_constant)
3476 {
3477 /* Check if we have a constant and solved it
3478 immediately. */
3479 offsetT val = reloc_exp->X_add_number;
3480 image |= insert_operand (image, &arc_operands[bitYoperand],
3481 val, NULL, 0);
3482 }
3483 else
3484 {
3485 struct arc_fixup *fixup;
3486
3487 if (insn->nfixups >= MAX_INSN_FIXUPS)
3488 as_fatal (_("too many fixups"));
3489
3490 fixup = &insn->fixups[insn->nfixups++];
3491 fixup->exp = *reloc_exp;
3492 fixup->reloc = -bitYoperand;
3493 fixup->pcrel = pcrel;
3494 fixup->islong = FALSE;
3495 }
3496 }
3497 else
3498 image |= (flg_operand->code & ((1 << flg_operand->bits) - 1))
3499 << flg_operand->shift;
3500 }
3501
3502 insn->relax = relax_insn_p (opcode, tok, ntok, pflags, nflg);
3503
3504 /* Short instruction? */
3505 insn->short_insn = ARC_SHORT (opcode->mask) ? TRUE : FALSE;
3506
3507 insn->insn = image;
3508
3509 /* Update last insn status. */
3510 arc_last_insns[1] = arc_last_insns[0];
3511 arc_last_insns[0].opcode = opcode;
3512 arc_last_insns[0].has_limm = insn->has_limm;
3513 arc_last_insns[0].has_delay_slot = has_delay_slot;
3514
3515 /* Check if the current instruction is legally used. */
3516 if (arc_last_insns[1].has_delay_slot
3517 && is_br_jmp_insn_p (arc_last_insns[0].opcode))
3518 as_bad_where (frag_now->fr_file, frag_now->fr_line,
3519 _("A jump/branch instruction in delay slot."));
3520 }
3521
3522 void
3523 arc_handle_align (fragS* fragP)
3524 {
3525 if ((fragP)->fr_type == rs_align_code)
3526 {
3527 char *dest = (fragP)->fr_literal + (fragP)->fr_fix;
3528 valueT count = ((fragP)->fr_next->fr_address
3529 - (fragP)->fr_address - (fragP)->fr_fix);
3530
3531 (fragP)->fr_var = 2;
3532
3533 if (count & 1)/* Padding in the gap till the next 2-byte
3534 boundary with 0s. */
3535 {
3536 (fragP)->fr_fix++;
3537 *dest++ = 0;
3538 }
3539 /* Writing nop_s. */
3540 md_number_to_chars (dest, NOP_OPCODE_S, 2);
3541 }
3542 }
3543
3544 /* Here we decide which fixups can be adjusted to make them relative
3545 to the beginning of the section instead of the symbol. Basically
3546 we need to make sure that the dynamic relocations are done
3547 correctly, so in some cases we force the original symbol to be
3548 used. */
3549
3550 int
3551 tc_arc_fix_adjustable (fixS *fixP)
3552 {
3553
3554 /* Prevent all adjustments to global symbols. */
3555 if (S_IS_EXTERNAL (fixP->fx_addsy))
3556 return 0;
3557 if (S_IS_WEAK (fixP->fx_addsy))
3558 return 0;
3559
3560 /* Adjust_reloc_syms doesn't know about the GOT. */
3561 switch (fixP->fx_r_type)
3562 {
3563 case BFD_RELOC_ARC_GOTPC32:
3564 case BFD_RELOC_ARC_PLT32:
3565 case BFD_RELOC_ARC_S25H_PCREL_PLT:
3566 case BFD_RELOC_ARC_S21H_PCREL_PLT:
3567 case BFD_RELOC_ARC_S25W_PCREL_PLT:
3568 case BFD_RELOC_ARC_S21W_PCREL_PLT:
3569 return 0;
3570
3571 default:
3572 break;
3573 }
3574
3575 return 1;
3576 }
3577
3578 /* Compute the reloc type of an expression EXP. */
3579
3580 static void
3581 arc_check_reloc (expressionS *exp,
3582 bfd_reloc_code_real_type *r_type_p)
3583 {
3584 if (*r_type_p == BFD_RELOC_32
3585 && exp->X_op == O_subtract
3586 && exp->X_op_symbol != NULL
3587 && exp->X_op_symbol->bsym->section == now_seg)
3588 *r_type_p = BFD_RELOC_ARC_32_PCREL;
3589 }
3590
3591
3592 /* Add expression EXP of SIZE bytes to offset OFF of fragment FRAG. */
3593
3594 void
3595 arc_cons_fix_new (fragS *frag,
3596 int off,
3597 int size,
3598 expressionS *exp,
3599 bfd_reloc_code_real_type r_type)
3600 {
3601 r_type = BFD_RELOC_UNUSED;
3602
3603 switch (size)
3604 {
3605 case 1:
3606 r_type = BFD_RELOC_8;
3607 break;
3608
3609 case 2:
3610 r_type = BFD_RELOC_16;
3611 break;
3612
3613 case 3:
3614 r_type = BFD_RELOC_24;
3615 break;
3616
3617 case 4:
3618 r_type = BFD_RELOC_32;
3619 arc_check_reloc (exp, &r_type);
3620 break;
3621
3622 case 8:
3623 r_type = BFD_RELOC_64;
3624 break;
3625
3626 default:
3627 as_bad (_("unsupported BFD relocation size %u"), size);
3628 r_type = BFD_RELOC_UNUSED;
3629 }
3630
3631 fix_new_exp (frag, off, size, exp, 0, r_type);
3632 }
3633
3634 /* The actual routine that checks the ZOL conditions. */
3635
3636 static void
3637 check_zol (symbolS *s)
3638 {
3639 switch (arc_mach_type)
3640 {
3641 case bfd_mach_arc_arcv2:
3642 if (arc_target & ARC_OPCODE_ARCv2EM)
3643 return;
3644
3645 if (is_br_jmp_insn_p (arc_last_insns[0].opcode)
3646 || arc_last_insns[1].has_delay_slot)
3647 as_bad (_("Jump/Branch instruction detected at the end of the ZOL label @%s"),
3648 S_GET_NAME (s));
3649
3650 break;
3651 case bfd_mach_arc_arc600:
3652
3653 if (is_kernel_insn_p (arc_last_insns[0].opcode))
3654 as_bad (_("Kernel instruction detected at the end of the ZOL label @%s"),
3655 S_GET_NAME (s));
3656
3657 if (arc_last_insns[0].has_limm
3658 && is_br_jmp_insn_p (arc_last_insns[0].opcode))
3659 as_bad (_("A jump instruction with long immediate detected at the \
3660 end of the ZOL label @%s"), S_GET_NAME (s));
3661
3662 /* Fall through. */
3663 case bfd_mach_arc_arc700:
3664 if (arc_last_insns[0].has_delay_slot)
3665 as_bad (_("An illegal use of delay slot detected at the end of the ZOL label @%s"),
3666 S_GET_NAME (s));
3667
3668 break;
3669 default:
3670 break;
3671 }
3672 }
3673
3674 /* If ZOL end check the last two instruction for illegals. */
3675 void
3676 arc_frob_label (symbolS * sym)
3677 {
3678 if (ARC_GET_FLAG (sym) & ARC_FLAG_ZOL)
3679 check_zol (sym);
3680
3681 dwarf2_emit_label (sym);
3682 }
3683
3684 /* Used because generic relaxation assumes a pc-rel value whilst we
3685 also relax instructions that use an absolute value resolved out of
3686 relative values (if that makes any sense). An example: 'add r1,
3687 r2, @.L2 - .' The symbols . and @.L2 are relative to the section
3688 but if they're in the same section we can subtract the section
3689 offset relocation which ends up in a resolved value. So if @.L2 is
3690 .text + 0x50 and . is .text + 0x10, we can say that .text + 0x50 -
3691 .text + 0x40 = 0x10. */
3692 int
3693 arc_pcrel_adjust (fragS *fragP)
3694 {
3695 if (!fragP->tc_frag_data.pcrel)
3696 return fragP->fr_address + fragP->fr_fix;
3697
3698 return 0;
3699 }
3700
3701 /* Initialize the DWARF-2 unwind information for this procedure. */
3702
3703 void
3704 tc_arc_frame_initial_instructions (void)
3705 {
3706 /* Stack pointer is register 28. */
3707 cfi_add_CFA_def_cfa_register (28);
3708 }
3709
3710 int
3711 tc_arc_regname_to_dw2regnum (char *regname)
3712 {
3713 struct symbol *sym;
3714
3715 sym = hash_find (arc_reg_hash, regname);
3716 if (sym)
3717 return S_GET_VALUE (sym);
3718
3719 return -1;
3720 }