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[deliverable/binutils-gdb.git] / gas / config / tc-arm.c
1 /* tc-arm.c -- Assemble for the ARM
2 Copyright (C) 1994, 95, 96, 97, 98, 1999, 2000 Free Software Foundation, Inc.
3 Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
4 Modified by David Taylor (dtaylor@armltd.co.uk)
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 2, 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, 59 Temple Place - Suite 330, Boston, MA
21 02111-1307, USA. */
22
23 #include <ctype.h>
24 #include <string.h>
25 #define NO_RELOC 0
26 #include "as.h"
27
28 /* need TARGET_CPU */
29 #include "config.h"
30 #include "subsegs.h"
31 #include "obstack.h"
32 #include "symbols.h"
33 #include "listing.h"
34
35 #ifdef OBJ_ELF
36 #include "elf/arm.h"
37 #endif
38
39 /* Types of processor to assemble for. */
40 #define ARM_1 0x00000001
41 #define ARM_2 0x00000002
42 #define ARM_3 0x00000004
43 #define ARM_250 ARM_3
44 #define ARM_6 0x00000008
45 #define ARM_7 ARM_6 /* same core instruction set */
46 #define ARM_8 ARM_6 /* same core instruction set */
47 #define ARM_9 ARM_6 /* same core instruction set */
48 #define ARM_CPU_MASK 0x0000000f
49
50 /* The following bitmasks control CPU extensions (ARM7 onwards): */
51 #define ARM_LONGMUL 0x00000010 /* allow long multiplies */
52 #define ARM_HALFWORD 0x00000020 /* allow half word loads */
53 #define ARM_THUMB 0x00000040 /* allow BX instruction */
54 #define ARM_EXT_V5 0x00000080 /* allow CLZ etc */
55 #define ARM_EXT_V5E 0x00000200 /* "El Segundo" */
56
57 /* Architectures are the sum of the base and extensions. */
58 #define ARM_ARCH_V4 (ARM_7 | ARM_LONGMUL | ARM_HALFWORD)
59 #define ARM_ARCH_V4T (ARM_ARCH_V4 | ARM_THUMB)
60 #define ARM_ARCH_V5 (ARM_ARCH_V4 | ARM_EXT_V5)
61 #define ARM_ARCH_V5T (ARM_ARCH_V5 | ARM_THUMB)
62
63 /* Some useful combinations: */
64 #define ARM_ANY 0x00ffffff
65 #define ARM_2UP (ARM_ANY - ARM_1)
66 #define ARM_ALL ARM_2UP /* Not arm1 only */
67 #define ARM_3UP 0x00fffffc
68 #define ARM_6UP 0x00fffff8 /* Includes ARM7 */
69
70 #define FPU_CORE 0x80000000
71 #define FPU_FPA10 0x40000000
72 #define FPU_FPA11 0x40000000
73 #define FPU_NONE 0
74
75 /* Some useful combinations */
76 #define FPU_ALL 0xff000000 /* Note this is ~ARM_ANY */
77 #define FPU_MEMMULTI 0x7f000000 /* Not fpu_core */
78
79
80 #ifndef CPU_DEFAULT
81 #if defined __thumb__
82 #define CPU_DEFAULT (ARM_ARCH_V4 | ARM_THUMB)
83 #else
84 #define CPU_DEFAULT ARM_ALL
85 #endif
86 #endif
87
88 #ifndef FPU_DEFAULT
89 #define FPU_DEFAULT FPU_ALL
90 #endif
91
92 #define streq(a, b) (strcmp (a, b) == 0)
93 #define skip_whitespace(str) while (* (str) == ' ') ++ (str)
94
95 static unsigned long cpu_variant = CPU_DEFAULT | FPU_DEFAULT;
96 static int target_oabi = 0;
97
98 #if defined OBJ_COFF || defined OBJ_ELF
99 /* Flags stored in private area of BFD structure */
100 static boolean uses_apcs_26 = false;
101 static boolean support_interwork = false;
102 static boolean uses_apcs_float = false;
103 static boolean pic_code = false;
104 #endif
105
106 /* This array holds the chars that always start a comment. If the
107 pre-processor is disabled, these aren't very useful. */
108 CONST char comment_chars[] = "@";
109
110 /* This array holds the chars that only start a comment at the beginning of
111 a line. If the line seems to have the form '# 123 filename'
112 .line and .file directives will appear in the pre-processed output. */
113 /* Note that input_file.c hand checks for '#' at the beginning of the
114 first line of the input file. This is because the compiler outputs
115 #NO_APP at the beginning of its output. */
116 /* Also note that comments like this one will always work. */
117 CONST char line_comment_chars[] = "#";
118
119 #ifdef TE_LINUX
120 CONST char line_separator_chars[] = ";";
121 #else
122 CONST char line_separator_chars[] = "";
123 #endif
124
125 /* Chars that can be used to separate mant
126 from exp in floating point numbers. */
127 CONST char EXP_CHARS[] = "eE";
128
129 /* Chars that mean this number is a floating point constant */
130 /* As in 0f12.456 */
131 /* or 0d1.2345e12 */
132
133 CONST char FLT_CHARS[] = "rRsSfFdDxXeEpP";
134
135 /* Prefix characters that indicate the start of an immediate
136 value. */
137 #define is_immediate_prefix(C) ((C) == '#' || (C) == '$')
138
139 #ifdef OBJ_ELF
140 symbolS * GOT_symbol; /* Pre-defined "_GLOBAL_OFFSET_TABLE_" */
141 #endif
142
143 CONST int md_reloc_size = 8; /* Size of relocation record */
144
145 static int thumb_mode = 0; /* 0: assemble for ARM, 1: assemble for Thumb,
146 2: assemble for Thumb even though target cpu
147 does not support thumb instructions. */
148 typedef struct arm_fix
149 {
150 int thumb_mode;
151 } arm_fix_data;
152
153 struct arm_it
154 {
155 CONST char * error;
156 unsigned long instruction;
157 int suffix;
158 int size;
159 struct
160 {
161 bfd_reloc_code_real_type type;
162 expressionS exp;
163 int pc_rel;
164 } reloc;
165 };
166
167 struct arm_it inst;
168
169 struct asm_shift
170 {
171 CONST char * template;
172 unsigned long value;
173 };
174
175 static CONST struct asm_shift shift[] =
176 {
177 {"asl", 0},
178 {"lsl", 0},
179 {"lsr", 0x00000020},
180 {"asr", 0x00000040},
181 {"ror", 0x00000060},
182 {"rrx", 0x00000060},
183 {"ASL", 0},
184 {"LSL", 0},
185 {"LSR", 0x00000020},
186 {"ASR", 0x00000040},
187 {"ROR", 0x00000060},
188 {"RRX", 0x00000060}
189 };
190
191 #define NO_SHIFT_RESTRICT 1
192 #define SHIFT_RESTRICT 0
193
194 #define NUM_FLOAT_VALS 8
195
196 CONST char * fp_const[] =
197 {
198 "0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "0.5", "10.0", 0
199 };
200
201 /* Number of littlenums required to hold an extended precision number. */
202 #define MAX_LITTLENUMS 6
203
204 LITTLENUM_TYPE fp_values[NUM_FLOAT_VALS][MAX_LITTLENUMS];
205
206 #define FAIL (-1)
207 #define SUCCESS (0)
208
209 #define SUFF_S 1
210 #define SUFF_D 2
211 #define SUFF_E 3
212 #define SUFF_P 4
213
214 #define CP_T_X 0x00008000
215 #define CP_T_Y 0x00400000
216 #define CP_T_Pre 0x01000000
217 #define CP_T_UD 0x00800000
218 #define CP_T_WB 0x00200000
219
220 #define CONDS_BIT (0x00100000)
221 #define LOAD_BIT (0x00100000)
222 #define TRANS_BIT (0x00200000)
223
224 struct asm_cond
225 {
226 CONST char * template;
227 unsigned long value;
228 };
229
230 /* This is to save a hash look-up in the common case. */
231 #define COND_ALWAYS 0xe0000000
232
233 static CONST struct asm_cond conds[] =
234 {
235 {"eq", 0x00000000},
236 {"ne", 0x10000000},
237 {"cs", 0x20000000}, {"hs", 0x20000000},
238 {"cc", 0x30000000}, {"ul", 0x30000000}, {"lo", 0x30000000},
239 {"mi", 0x40000000},
240 {"pl", 0x50000000},
241 {"vs", 0x60000000},
242 {"vc", 0x70000000},
243 {"hi", 0x80000000},
244 {"ls", 0x90000000},
245 {"ge", 0xa0000000},
246 {"lt", 0xb0000000},
247 {"gt", 0xc0000000},
248 {"le", 0xd0000000},
249 {"al", 0xe0000000},
250 {"nv", 0xf0000000}
251 };
252
253 /* Warning: If the top bit of the set_bits is set, then the standard
254 instruction bitmask is ignored, and the new bitmask is taken from
255 the set_bits: */
256 struct asm_flg
257 {
258 CONST char * template; /* Basic flag string */
259 unsigned long set_bits; /* Bits to set */
260 };
261
262 static CONST struct asm_flg s_flag[] =
263 {
264 {"s", CONDS_BIT},
265 {NULL, 0}
266 };
267
268 static CONST struct asm_flg ldr_flags[] =
269 {
270 {"b", 0x00400000},
271 {"t", TRANS_BIT},
272 {"bt", 0x00400000 | TRANS_BIT},
273 {"h", 0x801000b0},
274 {"sh", 0x801000f0},
275 {"sb", 0x801000d0},
276 {NULL, 0}
277 };
278
279 static CONST struct asm_flg str_flags[] =
280 {
281 {"b", 0x00400000},
282 {"t", TRANS_BIT},
283 {"bt", 0x00400000 | TRANS_BIT},
284 {"h", 0x800000b0},
285 {NULL, 0}
286 };
287
288 static CONST struct asm_flg byte_flag[] =
289 {
290 {"b", 0x00400000},
291 {NULL, 0}
292 };
293
294 static CONST struct asm_flg cmp_flags[] =
295 {
296 {"s", CONDS_BIT},
297 {"p", 0x0010f000},
298 {NULL, 0}
299 };
300
301 static CONST struct asm_flg ldm_flags[] =
302 {
303 {"ed", 0x01800000},
304 {"fd", 0x00800000},
305 {"ea", 0x01000000},
306 {"fa", 0x08000000},
307 {"ib", 0x01800000},
308 {"ia", 0x00800000},
309 {"db", 0x01000000},
310 {"da", 0x08000000},
311 {NULL, 0}
312 };
313
314 static CONST struct asm_flg stm_flags[] =
315 {
316 {"ed", 0x08000000},
317 {"fd", 0x01000000},
318 {"ea", 0x00800000},
319 {"fa", 0x01800000},
320 {"ib", 0x01800000},
321 {"ia", 0x00800000},
322 {"db", 0x01000000},
323 {"da", 0x08000000},
324 {NULL, 0}
325 };
326
327 static CONST struct asm_flg lfm_flags[] =
328 {
329 {"fd", 0x00800000},
330 {"ea", 0x01000000},
331 {NULL, 0}
332 };
333
334 static CONST struct asm_flg sfm_flags[] =
335 {
336 {"fd", 0x01000000},
337 {"ea", 0x00800000},
338 {NULL, 0}
339 };
340
341 static CONST struct asm_flg round_flags[] =
342 {
343 {"p", 0x00000020},
344 {"m", 0x00000040},
345 {"z", 0x00000060},
346 {NULL, 0}
347 };
348
349 /* The implementation of the FIX instruction is broken on some assemblers,
350 in that it accepts a precision specifier as well as a rounding specifier,
351 despite the fact that this is meaningless. To be more compatible, we
352 accept it as well, though of course it does not set any bits. */
353 static CONST struct asm_flg fix_flags[] =
354 {
355 {"p", 0x00000020},
356 {"m", 0x00000040},
357 {"z", 0x00000060},
358 {"sp", 0x00000020},
359 {"sm", 0x00000040},
360 {"sz", 0x00000060},
361 {"dp", 0x00000020},
362 {"dm", 0x00000040},
363 {"dz", 0x00000060},
364 {"ep", 0x00000020},
365 {"em", 0x00000040},
366 {"ez", 0x00000060},
367 {NULL, 0}
368 };
369
370 static CONST struct asm_flg except_flag[] =
371 {
372 {"e", 0x00400000},
373 {NULL, 0}
374 };
375
376 static CONST struct asm_flg cplong_flag[] =
377 {
378 {"l", 0x00400000},
379 {NULL, 0}
380 };
381
382 struct asm_psr
383 {
384 CONST char * template;
385 unsigned long number;
386 };
387
388 #define PSR_FIELD_MASK 0x000f0000
389
390 #define PSR_FLAGS 0x00080000
391 #define PSR_CONTROL 0x00010000 /* Undocumented instruction, its use is discouraged by ARM */
392 #define PSR_ALL 0x00090000
393
394 #define CPSR_ALL 0
395 #define SPSR_ALL 1
396 #define CPSR_FLG 2
397 #define SPSR_FLG 3
398 #define CPSR_CTL 4
399 #define SPSR_CTL 5
400
401 static CONST struct asm_psr psrs[] =
402 {
403 /* Valid <psr>'s */
404 {"cpsr", CPSR_ALL},
405 {"cpsr_all", CPSR_ALL},
406 {"spsr", SPSR_ALL},
407 {"spsr_all", SPSR_ALL},
408
409 /* Valid <psrf>'s */
410 {"cpsr_flg", CPSR_FLG},
411 {"spsr_flg", SPSR_FLG},
412
413 /* Valid <psrc>'s */
414 {"cpsr_c", CPSR_CTL},
415 {"cpsr_ctl", CPSR_CTL},
416 {"spsr_c", SPSR_CTL},
417 {"spsr_ctl", SPSR_CTL}
418 };
419
420 /* Functions called by parser. */
421 /* ARM instructions */
422 static void do_arit PARAMS ((char *, unsigned long));
423 static void do_cmp PARAMS ((char *, unsigned long));
424 static void do_mov PARAMS ((char *, unsigned long));
425 static void do_ldst PARAMS ((char *, unsigned long));
426 static void do_ldmstm PARAMS ((char *, unsigned long));
427 static void do_branch PARAMS ((char *, unsigned long));
428 static void do_swi PARAMS ((char *, unsigned long));
429 /* Pseudo Op codes */
430 static void do_adr PARAMS ((char *, unsigned long));
431 static void do_adrl PARAMS ((char *, unsigned long));
432 static void do_nop PARAMS ((char *, unsigned long));
433 /* ARM 2 */
434 static void do_mul PARAMS ((char *, unsigned long));
435 static void do_mla PARAMS ((char *, unsigned long));
436 /* ARM 3 */
437 static void do_swap PARAMS ((char *, unsigned long));
438 /* ARM 6 */
439 static void do_msr PARAMS ((char *, unsigned long));
440 static void do_mrs PARAMS ((char *, unsigned long));
441 /* ARM 7M */
442 static void do_mull PARAMS ((char *, unsigned long));
443 /* ARM THUMB */
444 static void do_bx PARAMS ((char *, unsigned long));
445
446
447 /* Coprocessor Instructions */
448 static void do_cdp PARAMS ((char *, unsigned long));
449 static void do_lstc PARAMS ((char *, unsigned long));
450 static void do_co_reg PARAMS ((char *, unsigned long));
451 static void do_fp_ctrl PARAMS ((char *, unsigned long));
452 static void do_fp_ldst PARAMS ((char *, unsigned long));
453 static void do_fp_ldmstm PARAMS ((char *, unsigned long));
454 static void do_fp_dyadic PARAMS ((char *, unsigned long));
455 static void do_fp_monadic PARAMS ((char *, unsigned long));
456 static void do_fp_cmp PARAMS ((char *, unsigned long));
457 static void do_fp_from_reg PARAMS ((char *, unsigned long));
458 static void do_fp_to_reg PARAMS ((char *, unsigned long));
459
460 static void fix_new_arm PARAMS ((fragS *, int, short, expressionS *, int, int));
461 static int arm_reg_parse PARAMS ((char **));
462 static int arm_psr_parse PARAMS ((char **));
463 static void symbol_locate PARAMS ((symbolS *, CONST char *, segT, valueT, fragS *));
464 static int add_to_lit_pool PARAMS ((void));
465 static unsigned validate_immediate PARAMS ((unsigned));
466 static unsigned validate_immediate_twopart PARAMS ((unsigned int, unsigned int *));
467 static int validate_offset_imm PARAMS ((unsigned int, int));
468 static void opcode_select PARAMS ((int));
469 static void end_of_line PARAMS ((char *));
470 static int reg_required_here PARAMS ((char **, int));
471 static int psr_required_here PARAMS ((char **, int, int));
472 static int co_proc_number PARAMS ((char **));
473 static int cp_opc_expr PARAMS ((char **, int, int));
474 static int cp_reg_required_here PARAMS ((char **, int));
475 static int fp_reg_required_here PARAMS ((char **, int));
476 static int cp_address_offset PARAMS ((char **));
477 static int cp_address_required_here PARAMS ((char **));
478 static int my_get_float_expression PARAMS ((char **));
479 static int skip_past_comma PARAMS ((char **));
480 static int walk_no_bignums PARAMS ((symbolS *));
481 static int negate_data_op PARAMS ((unsigned long *, unsigned long));
482 static int data_op2 PARAMS ((char **));
483 static int fp_op2 PARAMS ((char **));
484 static long reg_list PARAMS ((char **));
485 static void thumb_load_store PARAMS ((char *, int, int));
486 static int decode_shift PARAMS ((char **, int));
487 static int ldst_extend PARAMS ((char **, int));
488 static void thumb_add_sub PARAMS ((char *, int));
489 static void insert_reg PARAMS ((int));
490 static void thumb_shift PARAMS ((char *, int));
491 static void thumb_mov_compare PARAMS ((char *, int));
492 static void set_constant_flonums PARAMS ((void));
493 static valueT md_chars_to_number PARAMS ((char *, int));
494 static void insert_reg_alias PARAMS ((char *, int));
495 static void output_inst PARAMS ((void));
496 #ifdef OBJ_ELF
497 static bfd_reloc_code_real_type arm_parse_reloc PARAMS ((void));
498 #endif
499
500 /* ARM instructions take 4bytes in the object file, Thumb instructions
501 take 2: */
502 #define INSN_SIZE 4
503
504 /* LONGEST_INST is the longest basic instruction name without conditions or
505 flags. ARM7M has 4 of length 5. */
506
507 #define LONGEST_INST 5
508
509
510 struct asm_opcode
511 {
512 CONST char * template; /* Basic string to match */
513 unsigned long value; /* Basic instruction code */
514
515 /* Compulsory suffix that must follow conds. If "", then the
516 instruction is not conditional and must have no suffix. */
517 CONST char * comp_suffix;
518
519 CONST struct asm_flg * flags; /* Bits to toggle if flag 'n' set */
520 unsigned long variants; /* Which CPU variants this exists for */
521 /* Function to call to parse args */
522 void (* parms) PARAMS ((char *, unsigned long));
523 };
524
525 static CONST struct asm_opcode insns[] =
526 {
527 /* ARM Instructions */
528 {"and", 0x00000000, NULL, s_flag, ARM_ANY, do_arit},
529 {"eor", 0x00200000, NULL, s_flag, ARM_ANY, do_arit},
530 {"sub", 0x00400000, NULL, s_flag, ARM_ANY, do_arit},
531 {"rsb", 0x00600000, NULL, s_flag, ARM_ANY, do_arit},
532 {"add", 0x00800000, NULL, s_flag, ARM_ANY, do_arit},
533 {"adc", 0x00a00000, NULL, s_flag, ARM_ANY, do_arit},
534 {"sbc", 0x00c00000, NULL, s_flag, ARM_ANY, do_arit},
535 {"rsc", 0x00e00000, NULL, s_flag, ARM_ANY, do_arit},
536 {"orr", 0x01800000, NULL, s_flag, ARM_ANY, do_arit},
537 {"bic", 0x01c00000, NULL, s_flag, ARM_ANY, do_arit},
538 {"tst", 0x01000000, NULL, cmp_flags, ARM_ANY, do_cmp},
539 {"teq", 0x01200000, NULL, cmp_flags, ARM_ANY, do_cmp},
540 {"cmp", 0x01400000, NULL, cmp_flags, ARM_ANY, do_cmp},
541 {"cmn", 0x01600000, NULL, cmp_flags, ARM_ANY, do_cmp},
542 {"mov", 0x01a00000, NULL, s_flag, ARM_ANY, do_mov},
543 {"mvn", 0x01e00000, NULL, s_flag, ARM_ANY, do_mov},
544 {"str", 0x04000000, NULL, str_flags, ARM_ANY, do_ldst},
545 {"ldr", 0x04100000, NULL, ldr_flags, ARM_ANY, do_ldst},
546 {"stm", 0x08000000, NULL, stm_flags, ARM_ANY, do_ldmstm},
547 {"ldm", 0x08100000, NULL, ldm_flags, ARM_ANY, do_ldmstm},
548 {"swi", 0x0f000000, NULL, NULL, ARM_ANY, do_swi},
549 #ifdef TE_WINCE
550 {"bl", 0x0b000000, NULL, NULL, ARM_ANY, do_branch},
551 {"b", 0x0a000000, NULL, NULL, ARM_ANY, do_branch},
552 #else
553 {"bl", 0x0bfffffe, NULL, NULL, ARM_ANY, do_branch},
554 {"b", 0x0afffffe, NULL, NULL, ARM_ANY, do_branch},
555 #endif
556
557 /* Pseudo ops */
558 {"adr", 0x028f0000, NULL, NULL, ARM_ANY, do_adr},
559 {"adrl", 0x028f0000, NULL, NULL, ARM_ANY, do_adrl},
560 {"nop", 0x01a00000, NULL, NULL, ARM_ANY, do_nop},
561
562 /* ARM 2 multiplies */
563 {"mul", 0x00000090, NULL, s_flag, ARM_2UP, do_mul},
564 {"mla", 0x00200090, NULL, s_flag, ARM_2UP, do_mla},
565
566 /* ARM 3 - swp instructions */
567 {"swp", 0x01000090, NULL, byte_flag, ARM_3UP, do_swap},
568
569 /* ARM 6 Coprocessor instructions */
570 {"mrs", 0x010f0000, NULL, NULL, ARM_6UP, do_mrs},
571 {"msr", 0x0120f000, NULL, NULL, ARM_6UP, do_msr},
572 /* ScottB: our code uses 0x0128f000 for msr.
573 NickC: but this is wrong because the bits 16 and 19 are handled
574 by the PSR_xxx defines above. */
575
576 /* ARM 7M long multiplies - need signed/unsigned flags! */
577 {"smull", 0x00c00090, NULL, s_flag, ARM_LONGMUL, do_mull},
578 {"umull", 0x00800090, NULL, s_flag, ARM_LONGMUL, do_mull},
579 {"smlal", 0x00e00090, NULL, s_flag, ARM_LONGMUL, do_mull},
580 {"umlal", 0x00a00090, NULL, s_flag, ARM_LONGMUL, do_mull},
581
582 /* ARM THUMB interworking */
583 {"bx", 0x012fff10, NULL, NULL, ARM_THUMB, do_bx},
584
585 /* Floating point instructions */
586 {"wfs", 0x0e200110, NULL, NULL, FPU_ALL, do_fp_ctrl},
587 {"rfs", 0x0e300110, NULL, NULL, FPU_ALL, do_fp_ctrl},
588 {"wfc", 0x0e400110, NULL, NULL, FPU_ALL, do_fp_ctrl},
589 {"rfc", 0x0e500110, NULL, NULL, FPU_ALL, do_fp_ctrl},
590 {"ldf", 0x0c100100, "sdep", NULL, FPU_ALL, do_fp_ldst},
591 {"stf", 0x0c000100, "sdep", NULL, FPU_ALL, do_fp_ldst},
592 {"lfm", 0x0c100200, NULL, lfm_flags, FPU_MEMMULTI, do_fp_ldmstm},
593 {"sfm", 0x0c000200, NULL, sfm_flags, FPU_MEMMULTI, do_fp_ldmstm},
594 {"mvf", 0x0e008100, "sde", round_flags, FPU_ALL, do_fp_monadic},
595 {"mnf", 0x0e108100, "sde", round_flags, FPU_ALL, do_fp_monadic},
596 {"abs", 0x0e208100, "sde", round_flags, FPU_ALL, do_fp_monadic},
597 {"rnd", 0x0e308100, "sde", round_flags, FPU_ALL, do_fp_monadic},
598 {"sqt", 0x0e408100, "sde", round_flags, FPU_ALL, do_fp_monadic},
599 {"log", 0x0e508100, "sde", round_flags, FPU_ALL, do_fp_monadic},
600 {"lgn", 0x0e608100, "sde", round_flags, FPU_ALL, do_fp_monadic},
601 {"exp", 0x0e708100, "sde", round_flags, FPU_ALL, do_fp_monadic},
602 {"sin", 0x0e808100, "sde", round_flags, FPU_ALL, do_fp_monadic},
603 {"cos", 0x0e908100, "sde", round_flags, FPU_ALL, do_fp_monadic},
604 {"tan", 0x0ea08100, "sde", round_flags, FPU_ALL, do_fp_monadic},
605 {"asn", 0x0eb08100, "sde", round_flags, FPU_ALL, do_fp_monadic},
606 {"acs", 0x0ec08100, "sde", round_flags, FPU_ALL, do_fp_monadic},
607 {"atn", 0x0ed08100, "sde", round_flags, FPU_ALL, do_fp_monadic},
608 {"urd", 0x0ee08100, "sde", round_flags, FPU_ALL, do_fp_monadic},
609 {"nrm", 0x0ef08100, "sde", round_flags, FPU_ALL, do_fp_monadic},
610 {"adf", 0x0e000100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
611 {"suf", 0x0e200100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
612 {"rsf", 0x0e300100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
613 {"muf", 0x0e100100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
614 {"dvf", 0x0e400100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
615 {"rdf", 0x0e500100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
616 {"pow", 0x0e600100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
617 {"rpw", 0x0e700100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
618 {"rmf", 0x0e800100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
619 {"fml", 0x0e900100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
620 {"fdv", 0x0ea00100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
621 {"frd", 0x0eb00100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
622 {"pol", 0x0ec00100, "sde", round_flags, FPU_ALL, do_fp_dyadic},
623 {"cmf", 0x0e90f110, NULL, except_flag, FPU_ALL, do_fp_cmp},
624 {"cnf", 0x0eb0f110, NULL, except_flag, FPU_ALL, do_fp_cmp},
625 /* The FPA10 data sheet suggests that the 'E' of cmfe/cnfe should not
626 be an optional suffix, but part of the instruction. To be compatible,
627 we accept either. */
628 {"cmfe", 0x0ed0f110, NULL, NULL, FPU_ALL, do_fp_cmp},
629 {"cnfe", 0x0ef0f110, NULL, NULL, FPU_ALL, do_fp_cmp},
630 {"flt", 0x0e000110, "sde", round_flags, FPU_ALL, do_fp_from_reg},
631 {"fix", 0x0e100110, NULL, fix_flags, FPU_ALL, do_fp_to_reg},
632
633 /* Generic copressor instructions. */
634 {"cdp", 0x0e000000, NULL, NULL, ARM_2UP, do_cdp},
635 {"ldc", 0x0c100000, NULL, cplong_flag, ARM_2UP, do_lstc},
636 {"stc", 0x0c000000, NULL, cplong_flag, ARM_2UP, do_lstc},
637 {"mcr", 0x0e000010, NULL, NULL, ARM_2UP, do_co_reg},
638 {"mrc", 0x0e100010, NULL, NULL, ARM_2UP, do_co_reg},
639 };
640
641 /* Defines for various bits that we will want to toggle. */
642 #define INST_IMMEDIATE 0x02000000
643 #define OFFSET_REG 0x02000000
644 #define HWOFFSET_IMM 0x00400000
645 #define SHIFT_BY_REG 0x00000010
646 #define PRE_INDEX 0x01000000
647 #define INDEX_UP 0x00800000
648 #define WRITE_BACK 0x00200000
649 #define LDM_TYPE_2_OR_3 0x00400000
650
651 #define LITERAL_MASK 0xf000f000
652 #define COND_MASK 0xf0000000
653 #define OPCODE_MASK 0xfe1fffff
654 #define DATA_OP_SHIFT 21
655
656 /* Codes to distinguish the arithmetic instructions. */
657 #define OPCODE_AND 0
658 #define OPCODE_EOR 1
659 #define OPCODE_SUB 2
660 #define OPCODE_RSB 3
661 #define OPCODE_ADD 4
662 #define OPCODE_ADC 5
663 #define OPCODE_SBC 6
664 #define OPCODE_RSC 7
665 #define OPCODE_TST 8
666 #define OPCODE_TEQ 9
667 #define OPCODE_CMP 10
668 #define OPCODE_CMN 11
669 #define OPCODE_ORR 12
670 #define OPCODE_MOV 13
671 #define OPCODE_BIC 14
672 #define OPCODE_MVN 15
673
674 static void do_t_nop PARAMS ((char *));
675 static void do_t_arit PARAMS ((char *));
676 static void do_t_add PARAMS ((char *));
677 static void do_t_asr PARAMS ((char *));
678 static void do_t_branch9 PARAMS ((char *));
679 static void do_t_branch12 PARAMS ((char *));
680 static void do_t_branch23 PARAMS ((char *));
681 static void do_t_bx PARAMS ((char *));
682 static void do_t_compare PARAMS ((char *));
683 static void do_t_ldmstm PARAMS ((char *));
684 static void do_t_ldr PARAMS ((char *));
685 static void do_t_ldrb PARAMS ((char *));
686 static void do_t_ldrh PARAMS ((char *));
687 static void do_t_lds PARAMS ((char *));
688 static void do_t_lsl PARAMS ((char *));
689 static void do_t_lsr PARAMS ((char *));
690 static void do_t_mov PARAMS ((char *));
691 static void do_t_push_pop PARAMS ((char *));
692 static void do_t_str PARAMS ((char *));
693 static void do_t_strb PARAMS ((char *));
694 static void do_t_strh PARAMS ((char *));
695 static void do_t_sub PARAMS ((char *));
696 static void do_t_swi PARAMS ((char *));
697 static void do_t_adr PARAMS ((char *));
698
699 #define T_OPCODE_MUL 0x4340
700 #define T_OPCODE_TST 0x4200
701 #define T_OPCODE_CMN 0x42c0
702 #define T_OPCODE_NEG 0x4240
703 #define T_OPCODE_MVN 0x43c0
704
705 #define T_OPCODE_ADD_R3 0x1800
706 #define T_OPCODE_SUB_R3 0x1a00
707 #define T_OPCODE_ADD_HI 0x4400
708 #define T_OPCODE_ADD_ST 0xb000
709 #define T_OPCODE_SUB_ST 0xb080
710 #define T_OPCODE_ADD_SP 0xa800
711 #define T_OPCODE_ADD_PC 0xa000
712 #define T_OPCODE_ADD_I8 0x3000
713 #define T_OPCODE_SUB_I8 0x3800
714 #define T_OPCODE_ADD_I3 0x1c00
715 #define T_OPCODE_SUB_I3 0x1e00
716
717 #define T_OPCODE_ASR_R 0x4100
718 #define T_OPCODE_LSL_R 0x4080
719 #define T_OPCODE_LSR_R 0x40c0
720 #define T_OPCODE_ASR_I 0x1000
721 #define T_OPCODE_LSL_I 0x0000
722 #define T_OPCODE_LSR_I 0x0800
723
724 #define T_OPCODE_MOV_I8 0x2000
725 #define T_OPCODE_CMP_I8 0x2800
726 #define T_OPCODE_CMP_LR 0x4280
727 #define T_OPCODE_MOV_HR 0x4600
728 #define T_OPCODE_CMP_HR 0x4500
729
730 #define T_OPCODE_LDR_PC 0x4800
731 #define T_OPCODE_LDR_SP 0x9800
732 #define T_OPCODE_STR_SP 0x9000
733 #define T_OPCODE_LDR_IW 0x6800
734 #define T_OPCODE_STR_IW 0x6000
735 #define T_OPCODE_LDR_IH 0x8800
736 #define T_OPCODE_STR_IH 0x8000
737 #define T_OPCODE_LDR_IB 0x7800
738 #define T_OPCODE_STR_IB 0x7000
739 #define T_OPCODE_LDR_RW 0x5800
740 #define T_OPCODE_STR_RW 0x5000
741 #define T_OPCODE_LDR_RH 0x5a00
742 #define T_OPCODE_STR_RH 0x5200
743 #define T_OPCODE_LDR_RB 0x5c00
744 #define T_OPCODE_STR_RB 0x5400
745
746 #define T_OPCODE_PUSH 0xb400
747 #define T_OPCODE_POP 0xbc00
748
749 #define T_OPCODE_BRANCH 0xe7fe
750
751 static int thumb_reg PARAMS ((char ** str, int hi_lo));
752
753 #define THUMB_SIZE 2 /* Size of thumb instruction. */
754 #define THUMB_REG_LO 0x1
755 #define THUMB_REG_HI 0x2
756 #define THUMB_REG_ANY 0x3
757
758 #define THUMB_H1 0x0080
759 #define THUMB_H2 0x0040
760
761 #define THUMB_ASR 0
762 #define THUMB_LSL 1
763 #define THUMB_LSR 2
764
765 #define THUMB_MOVE 0
766 #define THUMB_COMPARE 1
767
768 #define THUMB_LOAD 0
769 #define THUMB_STORE 1
770
771 #define THUMB_PP_PC_LR 0x0100
772
773 /* These three are used for immediate shifts, do not alter. */
774 #define THUMB_WORD 2
775 #define THUMB_HALFWORD 1
776 #define THUMB_BYTE 0
777
778 struct thumb_opcode
779 {
780 CONST char * template; /* Basic string to match */
781 unsigned long value; /* Basic instruction code */
782 int size;
783 unsigned long variants; /* Which CPU variants this exists for */
784 void (* parms) PARAMS ((char *)); /* Function to call to parse args */
785 };
786
787 static CONST struct thumb_opcode tinsns[] =
788 {
789 {"adc", 0x4140, 2, ARM_THUMB, do_t_arit},
790 {"add", 0x0000, 2, ARM_THUMB, do_t_add},
791 {"and", 0x4000, 2, ARM_THUMB, do_t_arit},
792 {"asr", 0x0000, 2, ARM_THUMB, do_t_asr},
793 {"b", T_OPCODE_BRANCH, 2, ARM_THUMB, do_t_branch12},
794 {"beq", 0xd0fe, 2, ARM_THUMB, do_t_branch9},
795 {"bne", 0xd1fe, 2, ARM_THUMB, do_t_branch9},
796 {"bcs", 0xd2fe, 2, ARM_THUMB, do_t_branch9},
797 {"bhs", 0xd2fe, 2, ARM_THUMB, do_t_branch9},
798 {"bcc", 0xd3fe, 2, ARM_THUMB, do_t_branch9},
799 {"bul", 0xd3fe, 2, ARM_THUMB, do_t_branch9},
800 {"blo", 0xd3fe, 2, ARM_THUMB, do_t_branch9},
801 {"bmi", 0xd4fe, 2, ARM_THUMB, do_t_branch9},
802 {"bpl", 0xd5fe, 2, ARM_THUMB, do_t_branch9},
803 {"bvs", 0xd6fe, 2, ARM_THUMB, do_t_branch9},
804 {"bvc", 0xd7fe, 2, ARM_THUMB, do_t_branch9},
805 {"bhi", 0xd8fe, 2, ARM_THUMB, do_t_branch9},
806 {"bls", 0xd9fe, 2, ARM_THUMB, do_t_branch9},
807 {"bge", 0xdafe, 2, ARM_THUMB, do_t_branch9},
808 {"blt", 0xdbfe, 2, ARM_THUMB, do_t_branch9},
809 {"bgt", 0xdcfe, 2, ARM_THUMB, do_t_branch9},
810 {"ble", 0xddfe, 2, ARM_THUMB, do_t_branch9},
811 {"bic", 0x4380, 2, ARM_THUMB, do_t_arit},
812 {"bl", 0xf7fffffe, 4, ARM_THUMB, do_t_branch23},
813 {"bx", 0x4700, 2, ARM_THUMB, do_t_bx},
814 {"cmn", T_OPCODE_CMN, 2, ARM_THUMB, do_t_arit},
815 {"cmp", 0x0000, 2, ARM_THUMB, do_t_compare},
816 {"eor", 0x4040, 2, ARM_THUMB, do_t_arit},
817 {"ldmia", 0xc800, 2, ARM_THUMB, do_t_ldmstm},
818 {"ldr", 0x0000, 2, ARM_THUMB, do_t_ldr},
819 {"ldrb", 0x0000, 2, ARM_THUMB, do_t_ldrb},
820 {"ldrh", 0x0000, 2, ARM_THUMB, do_t_ldrh},
821 {"ldrsb", 0x5600, 2, ARM_THUMB, do_t_lds},
822 {"ldrsh", 0x5e00, 2, ARM_THUMB, do_t_lds},
823 {"ldsb", 0x5600, 2, ARM_THUMB, do_t_lds},
824 {"ldsh", 0x5e00, 2, ARM_THUMB, do_t_lds},
825 {"lsl", 0x0000, 2, ARM_THUMB, do_t_lsl},
826 {"lsr", 0x0000, 2, ARM_THUMB, do_t_lsr},
827 {"mov", 0x0000, 2, ARM_THUMB, do_t_mov},
828 {"mul", T_OPCODE_MUL, 2, ARM_THUMB, do_t_arit},
829 {"mvn", T_OPCODE_MVN, 2, ARM_THUMB, do_t_arit},
830 {"neg", T_OPCODE_NEG, 2, ARM_THUMB, do_t_arit},
831 {"orr", 0x4300, 2, ARM_THUMB, do_t_arit},
832 {"pop", 0xbc00, 2, ARM_THUMB, do_t_push_pop},
833 {"push", 0xb400, 2, ARM_THUMB, do_t_push_pop},
834 {"ror", 0x41c0, 2, ARM_THUMB, do_t_arit},
835 {"sbc", 0x4180, 2, ARM_THUMB, do_t_arit},
836 {"stmia", 0xc000, 2, ARM_THUMB, do_t_ldmstm},
837 {"str", 0x0000, 2, ARM_THUMB, do_t_str},
838 {"strb", 0x0000, 2, ARM_THUMB, do_t_strb},
839 {"strh", 0x0000, 2, ARM_THUMB, do_t_strh},
840 {"swi", 0xdf00, 2, ARM_THUMB, do_t_swi},
841 {"sub", 0x0000, 2, ARM_THUMB, do_t_sub},
842 {"tst", T_OPCODE_TST, 2, ARM_THUMB, do_t_arit},
843 /* Pseudo ops: */
844 {"adr", 0x0000, 2, ARM_THUMB, do_t_adr},
845 {"nop", 0x46C0, 2, ARM_THUMB, do_t_nop}, /* mov r8,r8 */
846 };
847
848 struct reg_entry
849 {
850 CONST char * name;
851 int number;
852 };
853
854 #define int_register(reg) ((reg) >= 0 && (reg) <= 15)
855 #define cp_register(reg) ((reg) >= 32 && (reg) <= 47)
856 #define fp_register(reg) ((reg) >= 16 && (reg) <= 23)
857
858 #define REG_PC 15
859 #define REG_LR 14
860 #define REG_SP 13
861
862 /* These are the standard names. Users can add aliases with .req */
863 static CONST struct reg_entry reg_table[] =
864 {
865 /* Processor Register Numbers. */
866 {"r0", 0}, {"r1", 1}, {"r2", 2}, {"r3", 3},
867 {"r4", 4}, {"r5", 5}, {"r6", 6}, {"r7", 7},
868 {"r8", 8}, {"r9", 9}, {"r10", 10}, {"r11", 11},
869 {"r12", 12}, {"r13", REG_SP},{"r14", REG_LR},{"r15", REG_PC},
870 /* APCS conventions. */
871 {"a1", 0}, {"a2", 1}, {"a3", 2}, {"a4", 3},
872 {"v1", 4}, {"v2", 5}, {"v3", 6}, {"v4", 7}, {"v5", 8},
873 {"v6", 9}, {"sb", 9}, {"v7", 10}, {"sl", 10},
874 {"fp", 11}, {"ip", 12}, {"sp", REG_SP},{"lr", REG_LR},{"pc", REG_PC},
875 /* ATPCS additions to APCS conventions. */
876 {"wr", 7}, {"v8", 11},
877 /* FP Registers. */
878 {"f0", 16}, {"f1", 17}, {"f2", 18}, {"f3", 19},
879 {"f4", 20}, {"f5", 21}, {"f6", 22}, {"f7", 23},
880 {"c0", 32}, {"c1", 33}, {"c2", 34}, {"c3", 35},
881 {"c4", 36}, {"c5", 37}, {"c6", 38}, {"c7", 39},
882 {"c8", 40}, {"c9", 41}, {"c10", 42}, {"c11", 43},
883 {"c12", 44}, {"c13", 45}, {"c14", 46}, {"c15", 47},
884 {"cr0", 32}, {"cr1", 33}, {"cr2", 34}, {"cr3", 35},
885 {"cr4", 36}, {"cr5", 37}, {"cr6", 38}, {"cr7", 39},
886 {"cr8", 40}, {"cr9", 41}, {"cr10", 42}, {"cr11", 43},
887 {"cr12", 44}, {"cr13", 45}, {"cr14", 46}, {"cr15", 47},
888 /* ATPCS additions to float register names. */
889 {"s0",16}, {"s1",17}, {"s2",18}, {"s3",19},
890 {"s4",20}, {"s5",21}, {"s6",22}, {"s7",23},
891 {"d0",16}, {"d1",17}, {"d2",18}, {"d3",19},
892 {"d4",20}, {"d5",21}, {"d6",22}, {"d7",23},
893 /* FIXME: At some point we need to add VFP register names. */
894 /* Array terminator. */
895 {NULL, 0}
896 };
897
898 #define BAD_ARGS _("Bad arguments to instruction")
899 #define BAD_PC _("r15 not allowed here")
900 #define BAD_FLAGS _("Instruction should not have flags")
901 #define BAD_COND _("Instruction is not conditional")
902
903 static struct hash_control * arm_ops_hsh = NULL;
904 static struct hash_control * arm_tops_hsh = NULL;
905 static struct hash_control * arm_cond_hsh = NULL;
906 static struct hash_control * arm_shift_hsh = NULL;
907 static struct hash_control * arm_reg_hsh = NULL;
908 static struct hash_control * arm_psr_hsh = NULL;
909
910 /* This table describes all the machine specific pseudo-ops the assembler
911 has to support. The fields are:
912 pseudo-op name without dot
913 function to call to execute this pseudo-op
914 Integer arg to pass to the function. */
915
916 static void s_req PARAMS ((int));
917 static void s_align PARAMS ((int));
918 static void s_bss PARAMS ((int));
919 static void s_even PARAMS ((int));
920 static void s_ltorg PARAMS ((int));
921 static void s_arm PARAMS ((int));
922 static void s_thumb PARAMS ((int));
923 static void s_code PARAMS ((int));
924 static void s_force_thumb PARAMS ((int));
925 static void s_thumb_func PARAMS ((int));
926 static void s_thumb_set PARAMS ((int));
927 static void arm_s_text PARAMS ((int));
928 static void arm_s_data PARAMS ((int));
929 #ifdef OBJ_ELF
930 static void arm_s_section PARAMS ((int));
931 static void s_arm_elf_cons PARAMS ((int));
932 #endif
933
934 static int my_get_expression PARAMS ((expressionS *, char **));
935
936 CONST pseudo_typeS md_pseudo_table[] =
937 {
938 { "req", s_req, 0 }, /* Never called becasue '.req' does not start line */
939 { "bss", s_bss, 0 },
940 { "align", s_align, 0 },
941 { "arm", s_arm, 0 },
942 { "thumb", s_thumb, 0 },
943 { "code", s_code, 0 },
944 { "force_thumb", s_force_thumb, 0 },
945 { "thumb_func", s_thumb_func, 0 },
946 { "thumb_set", s_thumb_set, 0 },
947 { "even", s_even, 0 },
948 { "ltorg", s_ltorg, 0 },
949 { "pool", s_ltorg, 0 },
950 /* Allow for the effect of section changes. */
951 { "text", arm_s_text, 0 },
952 { "data", arm_s_data, 0 },
953 #ifdef OBJ_ELF
954 { "section", arm_s_section, 0 },
955 { "section.s", arm_s_section, 0 },
956 { "sect", arm_s_section, 0 },
957 { "sect.s", arm_s_section, 0 },
958 { "word", s_arm_elf_cons, 4 },
959 { "long", s_arm_elf_cons, 4 },
960 #else
961 { "word", cons, 4},
962 #endif
963 { "extend", float_cons, 'x' },
964 { "ldouble", float_cons, 'x' },
965 { "packed", float_cons, 'p' },
966 { 0, 0, 0 }
967 };
968
969 /* Stuff needed to resolve the label ambiguity
970 As:
971 ...
972 label: <insn>
973 may differ from:
974 ...
975 label:
976 <insn>
977 */
978
979 symbolS * last_label_seen;
980 static int label_is_thumb_function_name = false;
981
982 /* Literal stuff */
983
984 #define MAX_LITERAL_POOL_SIZE 1024
985
986 typedef struct literalS
987 {
988 struct expressionS exp;
989 struct arm_it * inst;
990 } literalT;
991
992 literalT literals[MAX_LITERAL_POOL_SIZE];
993 int next_literal_pool_place = 0; /* Next free entry in the pool */
994 int lit_pool_num = 1; /* Next literal pool number */
995 symbolS * current_poolP = NULL;
996
997 static int
998 add_to_lit_pool ()
999 {
1000 int lit_count = 0;
1001
1002 if (current_poolP == NULL)
1003 current_poolP = symbol_create (FAKE_LABEL_NAME, undefined_section,
1004 (valueT) 0, &zero_address_frag);
1005
1006 /* Check if this literal value is already in the pool: */
1007 while (lit_count < next_literal_pool_place)
1008 {
1009 if (literals[lit_count].exp.X_op == inst.reloc.exp.X_op
1010 && inst.reloc.exp.X_op == O_constant
1011 && literals[lit_count].exp.X_add_number
1012 == inst.reloc.exp.X_add_number
1013 && literals[lit_count].exp.X_unsigned == inst.reloc.exp.X_unsigned)
1014 break;
1015 lit_count++;
1016 }
1017
1018 if (lit_count == next_literal_pool_place) /* new entry */
1019 {
1020 if (next_literal_pool_place > MAX_LITERAL_POOL_SIZE)
1021 {
1022 inst.error = _("Literal Pool Overflow");
1023 return FAIL;
1024 }
1025
1026 literals[next_literal_pool_place].exp = inst.reloc.exp;
1027 lit_count = next_literal_pool_place++;
1028 }
1029
1030 inst.reloc.exp.X_op = O_symbol;
1031 inst.reloc.exp.X_add_number = (lit_count) * 4 - 8;
1032 inst.reloc.exp.X_add_symbol = current_poolP;
1033
1034 return SUCCESS;
1035 }
1036
1037 /* Can't use symbol_new here, so have to create a symbol and then at
1038 a later date assign it a value. Thats what these functions do. */
1039 static void
1040 symbol_locate (symbolP, name, segment, valu, frag)
1041 symbolS * symbolP;
1042 CONST char * name; /* It is copied, the caller can modify */
1043 segT segment; /* Segment identifier (SEG_<something>) */
1044 valueT valu; /* Symbol value */
1045 fragS * frag; /* Associated fragment */
1046 {
1047 unsigned int name_length;
1048 char * preserved_copy_of_name;
1049
1050 name_length = strlen (name) + 1; /* +1 for \0 */
1051 obstack_grow (&notes, name, name_length);
1052 preserved_copy_of_name = obstack_finish (&notes);
1053 #ifdef STRIP_UNDERSCORE
1054 if (preserved_copy_of_name[0] == '_')
1055 preserved_copy_of_name++;
1056 #endif
1057
1058 #ifdef tc_canonicalize_symbol_name
1059 preserved_copy_of_name =
1060 tc_canonicalize_symbol_name (preserved_copy_of_name);
1061 #endif
1062
1063 S_SET_NAME (symbolP, preserved_copy_of_name);
1064
1065 S_SET_SEGMENT (symbolP, segment);
1066 S_SET_VALUE (symbolP, valu);
1067 symbol_clear_list_pointers(symbolP);
1068
1069 symbol_set_frag (symbolP, frag);
1070
1071 /* Link to end of symbol chain. */
1072 {
1073 extern int symbol_table_frozen;
1074 if (symbol_table_frozen)
1075 abort ();
1076 }
1077
1078 symbol_append (symbolP, symbol_lastP, & symbol_rootP, & symbol_lastP);
1079
1080 obj_symbol_new_hook (symbolP);
1081
1082 #ifdef tc_symbol_new_hook
1083 tc_symbol_new_hook (symbolP);
1084 #endif
1085
1086 #ifdef DEBUG_SYMS
1087 verify_symbol_chain (symbol_rootP, symbol_lastP);
1088 #endif /* DEBUG_SYMS */
1089 }
1090
1091 /* Check that an immediate is valid, and if so,
1092 convert it to the right format. */
1093 static unsigned int
1094 validate_immediate (val)
1095 unsigned int val;
1096 {
1097 unsigned int a;
1098 unsigned int i;
1099
1100 #define rotate_left(v, n) (v << n | v >> (32 - n))
1101
1102 for (i = 0; i < 32; i += 2)
1103 if ((a = rotate_left (val, i)) <= 0xff)
1104 return a | (i << 7); /* 12-bit pack: [shift-cnt,const] */
1105
1106 return FAIL;
1107 }
1108
1109 /* Check to see if an immediate can be computed as two seperate immediate
1110 values, added together. We already know that this value cannot be
1111 computed by just one ARM instruction. */
1112 static unsigned int
1113 validate_immediate_twopart (val, highpart)
1114 unsigned int val;
1115 unsigned int * highpart;
1116 {
1117 unsigned int a;
1118 unsigned int i;
1119
1120 for (i = 0; i < 32; i += 2)
1121 if (((a = rotate_left (val, i)) & 0xff) != 0)
1122 {
1123 if (a & 0xff00)
1124 {
1125 if (a & ~ 0xffff)
1126 continue;
1127 * highpart = (a >> 8) | ((i + 24) << 7);
1128 }
1129 else if (a & 0xff0000)
1130 {
1131 if (a & 0xff000000)
1132 continue;
1133
1134 * highpart = (a >> 16) | ((i + 16) << 7);
1135 }
1136 else
1137 {
1138 assert (a & 0xff000000);
1139
1140 * highpart = (a >> 24) | ((i + 8) << 7);
1141 }
1142
1143 return (a & 0xff) | (i << 7);
1144 }
1145
1146 return FAIL;
1147 }
1148
1149 static int
1150 validate_offset_imm (val, hwse)
1151 unsigned int val;
1152 int hwse;
1153 {
1154 if ((hwse && val > 255) || val > 4095)
1155 return FAIL;
1156 return val;
1157 }
1158
1159
1160 static void
1161 s_req (a)
1162 int a ATTRIBUTE_UNUSED;
1163 {
1164 as_bad (_("Invalid syntax for .req directive."));
1165 }
1166
1167 static void
1168 s_bss (ignore)
1169 int ignore ATTRIBUTE_UNUSED;
1170 {
1171 /* We don't support putting frags in the BSS segment, we fake it by
1172 marking in_bss, then looking at s_skip for clues?.. */
1173 subseg_set (bss_section, 0);
1174 demand_empty_rest_of_line ();
1175 }
1176
1177 static void
1178 s_even (ignore)
1179 int ignore ATTRIBUTE_UNUSED;
1180 {
1181 if (!need_pass_2) /* Never make frag if expect extra pass. */
1182 frag_align (1, 0, 0);
1183
1184 record_alignment (now_seg, 1);
1185
1186 demand_empty_rest_of_line ();
1187 }
1188
1189 static void
1190 s_ltorg (ignored)
1191 int ignored ATTRIBUTE_UNUSED;
1192 {
1193 int lit_count = 0;
1194 char sym_name[20];
1195
1196 if (current_poolP == NULL)
1197 return;
1198
1199 /* Align pool as you have word accesses */
1200 /* Only make a frag if we have to ... */
1201 if (!need_pass_2)
1202 frag_align (2, 0, 0);
1203
1204 record_alignment (now_seg, 2);
1205
1206 sprintf (sym_name, "$$lit_\002%x", lit_pool_num++);
1207
1208 symbol_locate (current_poolP, sym_name, now_seg,
1209 (valueT) frag_now_fix (), frag_now);
1210 symbol_table_insert (current_poolP);
1211
1212 ARM_SET_THUMB (current_poolP, thumb_mode);
1213
1214 #if defined OBJ_COFF || defined OBJ_ELF
1215 ARM_SET_INTERWORK (current_poolP, support_interwork);
1216 #endif
1217
1218 while (lit_count < next_literal_pool_place)
1219 /* First output the expression in the instruction to the pool. */
1220 emit_expr (&(literals[lit_count++].exp), 4); /* .word */
1221
1222 next_literal_pool_place = 0;
1223 current_poolP = NULL;
1224 }
1225
1226 static void
1227 s_align (unused) /* Same as s_align_ptwo but align 0 => align 2 */
1228 int unused ATTRIBUTE_UNUSED;
1229 {
1230 register int temp;
1231 register long temp_fill;
1232 long max_alignment = 15;
1233
1234 temp = get_absolute_expression ();
1235 if (temp > max_alignment)
1236 as_bad (_("Alignment too large: %d. assumed."), temp = max_alignment);
1237 else if (temp < 0)
1238 {
1239 as_bad (_("Alignment negative. 0 assumed."));
1240 temp = 0;
1241 }
1242
1243 if (*input_line_pointer == ',')
1244 {
1245 input_line_pointer++;
1246 temp_fill = get_absolute_expression ();
1247 }
1248 else
1249 temp_fill = 0;
1250
1251 if (!temp)
1252 temp = 2;
1253
1254 /* Only make a frag if we HAVE to. . . */
1255 if (temp && !need_pass_2)
1256 frag_align (temp, (int) temp_fill, 0);
1257 demand_empty_rest_of_line ();
1258
1259 record_alignment (now_seg, temp);
1260 }
1261
1262 static void
1263 s_force_thumb (ignore)
1264 int ignore ATTRIBUTE_UNUSED;
1265 {
1266 /* If we are not already in thumb mode go into it, EVEN if
1267 the target processor does not support thumb instructions.
1268 This is used by gcc/config/arm/lib1funcs.asm for example
1269 to compile interworking support functions even if the
1270 target processor should not support interworking. */
1271
1272 if (! thumb_mode)
1273 {
1274 thumb_mode = 2;
1275
1276 record_alignment (now_seg, 1);
1277 }
1278
1279 demand_empty_rest_of_line ();
1280 }
1281
1282 static void
1283 s_thumb_func (ignore)
1284 int ignore ATTRIBUTE_UNUSED;
1285 {
1286 /* The following label is the name/address of the start of a Thumb function.
1287 We need to know this for the interworking support. */
1288
1289 label_is_thumb_function_name = true;
1290
1291 demand_empty_rest_of_line ();
1292 }
1293
1294 /* Perform a .set directive, but also mark the alias as
1295 being a thumb function. */
1296
1297 static void
1298 s_thumb_set (equiv)
1299 int equiv;
1300 {
1301 /* XXX the following is a duplicate of the code for s_set() in read.c
1302 We cannot just call that code as we need to get at the symbol that
1303 is created. */
1304 register char * name;
1305 register char delim;
1306 register char * end_name;
1307 register symbolS * symbolP;
1308
1309 /*
1310 * Especial apologies for the random logic:
1311 * this just grew, and could be parsed much more simply!
1312 * Dean in haste.
1313 */
1314 name = input_line_pointer;
1315 delim = get_symbol_end ();
1316 end_name = input_line_pointer;
1317 *end_name = delim;
1318
1319 SKIP_WHITESPACE ();
1320
1321 if (*input_line_pointer != ',')
1322 {
1323 *end_name = 0;
1324 as_bad (_("Expected comma after name \"%s\""), name);
1325 *end_name = delim;
1326 ignore_rest_of_line ();
1327 return;
1328 }
1329
1330 input_line_pointer++;
1331 *end_name = 0;
1332
1333 if (name[0] == '.' && name[1] == '\0')
1334 {
1335 /* XXX - this should not happen to .thumb_set */
1336 abort ();
1337 }
1338
1339 if ((symbolP = symbol_find (name)) == NULL
1340 && (symbolP = md_undefined_symbol (name)) == NULL)
1341 {
1342 #ifndef NO_LISTING
1343 /* When doing symbol listings, play games with dummy fragments living
1344 outside the normal fragment chain to record the file and line info
1345 for this symbol. */
1346 if (listing & LISTING_SYMBOLS)
1347 {
1348 extern struct list_info_struct * listing_tail;
1349 fragS * dummy_frag = (fragS *) xmalloc (sizeof(fragS));
1350 memset (dummy_frag, 0, sizeof(fragS));
1351 dummy_frag->fr_type = rs_fill;
1352 dummy_frag->line = listing_tail;
1353 symbolP = symbol_new (name, undefined_section, 0, dummy_frag);
1354 dummy_frag->fr_symbol = symbolP;
1355 }
1356 else
1357 #endif
1358 symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
1359
1360 #ifdef OBJ_COFF
1361 /* "set" symbols are local unless otherwise specified. */
1362 SF_SET_LOCAL (symbolP);
1363 #endif /* OBJ_COFF */
1364 } /* make a new symbol */
1365
1366 symbol_table_insert (symbolP);
1367
1368 * end_name = delim;
1369
1370 if (equiv
1371 && S_IS_DEFINED (symbolP)
1372 && S_GET_SEGMENT (symbolP) != reg_section)
1373 as_bad (_("symbol `%s' already defined"), S_GET_NAME (symbolP));
1374
1375 pseudo_set (symbolP);
1376
1377 demand_empty_rest_of_line ();
1378
1379 /* XXX Now we come to the Thumb specific bit of code. */
1380
1381 THUMB_SET_FUNC (symbolP, 1);
1382 ARM_SET_THUMB (symbolP, 1);
1383 #if defined OBJ_ELF || defined OBJ_COFF
1384 ARM_SET_INTERWORK (symbolP, support_interwork);
1385 #endif
1386 }
1387
1388 /* If we change section we must dump the literal pool first. */
1389 static void
1390 arm_s_text (ignore)
1391 int ignore;
1392 {
1393 if (now_seg != text_section)
1394 s_ltorg (0);
1395
1396 #ifdef OBJ_ELF
1397 obj_elf_text (ignore);
1398 #else
1399 s_text (ignore);
1400 #endif
1401 }
1402
1403 static void
1404 arm_s_data (ignore)
1405 int ignore;
1406 {
1407 if (flag_readonly_data_in_text)
1408 {
1409 if (now_seg != text_section)
1410 s_ltorg (0);
1411 }
1412 else if (now_seg != data_section)
1413 s_ltorg (0);
1414
1415 #ifdef OBJ_ELF
1416 obj_elf_data (ignore);
1417 #else
1418 s_data (ignore);
1419 #endif
1420 }
1421
1422 #ifdef OBJ_ELF
1423 static void
1424 arm_s_section (ignore)
1425 int ignore;
1426 {
1427 s_ltorg (0);
1428
1429 obj_elf_section (ignore);
1430 }
1431 #endif
1432
1433 static void
1434 opcode_select (width)
1435 int width;
1436 {
1437 switch (width)
1438 {
1439 case 16:
1440 if (! thumb_mode)
1441 {
1442 if (! (cpu_variant & ARM_THUMB))
1443 as_bad (_("selected processor does not support THUMB opcodes"));
1444 thumb_mode = 1;
1445 /* No need to force the alignment, since we will have been
1446 coming from ARM mode, which is word-aligned. */
1447 record_alignment (now_seg, 1);
1448 }
1449 break;
1450
1451 case 32:
1452 if (thumb_mode)
1453 {
1454 if ((cpu_variant & ARM_ANY) == ARM_THUMB)
1455 as_bad (_("selected processor does not support ARM opcodes"));
1456 thumb_mode = 0;
1457 if (!need_pass_2)
1458 frag_align (2, 0, 0);
1459 record_alignment (now_seg, 1);
1460 }
1461 break;
1462
1463 default:
1464 as_bad (_("invalid instruction size selected (%d)"), width);
1465 }
1466 }
1467
1468 static void
1469 s_arm (ignore)
1470 int ignore ATTRIBUTE_UNUSED;
1471 {
1472 opcode_select (32);
1473 demand_empty_rest_of_line ();
1474 }
1475
1476 static void
1477 s_thumb (ignore)
1478 int ignore ATTRIBUTE_UNUSED;
1479 {
1480 opcode_select (16);
1481 demand_empty_rest_of_line ();
1482 }
1483
1484 static void
1485 s_code (unused)
1486 int unused ATTRIBUTE_UNUSED;
1487 {
1488 register int temp;
1489
1490 temp = get_absolute_expression ();
1491 switch (temp)
1492 {
1493 case 16:
1494 case 32:
1495 opcode_select (temp);
1496 break;
1497
1498 default:
1499 as_bad (_("invalid operand to .code directive (%d) (expecting 16 or 32)"), temp);
1500 }
1501 }
1502
1503 static void
1504 end_of_line (str)
1505 char * str;
1506 {
1507 skip_whitespace (str);
1508
1509 if (* str != '\0')
1510 inst.error = _("Garbage following instruction");
1511 }
1512
1513 static int
1514 skip_past_comma (str)
1515 char ** str;
1516 {
1517 char *p = *str, c;
1518 int comma = 0;
1519
1520 while ((c = *p) == ' ' || c == ',')
1521 {
1522 p++;
1523 if (c == ',' && comma++)
1524 return FAIL;
1525 }
1526
1527 if (c == '\0')
1528 return FAIL;
1529
1530 *str = p;
1531 return comma ? SUCCESS : FAIL;
1532 }
1533
1534 /* A standard register must be given at this point.
1535 Shift is the place to put it in inst.instruction.
1536 Restores input start point on err.
1537 Returns the reg#, or FAIL. */
1538 static int
1539 reg_required_here (str, shift)
1540 char ** str;
1541 int shift;
1542 {
1543 static char buff [128]; /* XXX */
1544 int reg;
1545 char * start = *str;
1546
1547 if ((reg = arm_reg_parse (str)) != FAIL && int_register (reg))
1548 {
1549 if (shift >= 0)
1550 inst.instruction |= reg << shift;
1551 return reg;
1552 }
1553
1554 /* Restore the start point, we may have got a reg of the wrong class. */
1555 *str = start;
1556
1557 /* In the few cases where we might be able to accept something else
1558 this error can be overridden. */
1559 sprintf (buff, _("Register expected, not '%.100s'"), start);
1560 inst.error = buff;
1561
1562 return FAIL;
1563 }
1564
1565 static int
1566 psr_required_here (str, cpsr, spsr)
1567 char ** str;
1568 int cpsr;
1569 int spsr;
1570 {
1571 int psr;
1572 char * start = *str;
1573 psr = arm_psr_parse (str);
1574
1575 if (psr == cpsr || psr == spsr)
1576 {
1577 if (psr == spsr)
1578 inst.instruction |= 1 << 22;
1579
1580 return SUCCESS;
1581 }
1582
1583 /* In the few cases where we might be able to accept something else
1584 this error can be overridden. */
1585 inst.error = _("<psr(f)> expected");
1586
1587 /* Restore the start point. */
1588 *str = start;
1589 return FAIL;
1590 }
1591
1592 static int
1593 co_proc_number (str)
1594 char ** str;
1595 {
1596 int processor, pchar;
1597
1598 skip_whitespace (* str);
1599
1600 /* The data sheet seems to imply that just a number on its own is valid
1601 here, but the RISC iX assembler seems to accept a prefix 'p'. We will
1602 accept either. */
1603 if (**str == 'p' || **str == 'P')
1604 (*str)++;
1605
1606 pchar = *(*str)++;
1607 if (pchar >= '0' && pchar <= '9')
1608 {
1609 processor = pchar - '0';
1610 if (**str >= '0' && **str <= '9')
1611 {
1612 processor = processor * 10 + *(*str)++ - '0';
1613 if (processor > 15)
1614 {
1615 inst.error = _("Illegal co-processor number");
1616 return FAIL;
1617 }
1618 }
1619 }
1620 else
1621 {
1622 inst.error = _("Bad or missing co-processor number");
1623 return FAIL;
1624 }
1625
1626 inst.instruction |= processor << 8;
1627 return SUCCESS;
1628 }
1629
1630 static int
1631 cp_opc_expr (str, where, length)
1632 char ** str;
1633 int where;
1634 int length;
1635 {
1636 expressionS expr;
1637
1638 skip_whitespace (* str);
1639
1640 memset (&expr, '\0', sizeof (expr));
1641
1642 if (my_get_expression (&expr, str))
1643 return FAIL;
1644 if (expr.X_op != O_constant)
1645 {
1646 inst.error = _("bad or missing expression");
1647 return FAIL;
1648 }
1649
1650 if ((expr.X_add_number & ((1 << length) - 1)) != expr.X_add_number)
1651 {
1652 inst.error = _("immediate co-processor expression too large");
1653 return FAIL;
1654 }
1655
1656 inst.instruction |= expr.X_add_number << where;
1657 return SUCCESS;
1658 }
1659
1660 static int
1661 cp_reg_required_here (str, where)
1662 char ** str;
1663 int where;
1664 {
1665 int reg;
1666 char * start = *str;
1667
1668 if ((reg = arm_reg_parse (str)) != FAIL && cp_register (reg))
1669 {
1670 reg &= 15;
1671 inst.instruction |= reg << where;
1672 return reg;
1673 }
1674
1675 /* In the few cases where we might be able to accept something else
1676 this error can be overridden. */
1677 inst.error = _("Co-processor register expected");
1678
1679 /* Restore the start point. */
1680 *str = start;
1681 return FAIL;
1682 }
1683
1684 static int
1685 fp_reg_required_here (str, where)
1686 char ** str;
1687 int where;
1688 {
1689 int reg;
1690 char * start = *str;
1691
1692 if ((reg = arm_reg_parse (str)) != FAIL && fp_register (reg))
1693 {
1694 reg &= 7;
1695 inst.instruction |= reg << where;
1696 return reg;
1697 }
1698
1699 /* In the few cases where we might be able to accept something else
1700 this error can be overridden. */
1701 inst.error = _("Floating point register expected");
1702
1703 /* Restore the start point. */
1704 *str = start;
1705 return FAIL;
1706 }
1707
1708 static int
1709 cp_address_offset (str)
1710 char ** str;
1711 {
1712 int offset;
1713
1714 skip_whitespace (* str);
1715
1716 if (! is_immediate_prefix (**str))
1717 {
1718 inst.error = _("immediate expression expected");
1719 return FAIL;
1720 }
1721
1722 (*str)++;
1723
1724 if (my_get_expression (& inst.reloc.exp, str))
1725 return FAIL;
1726
1727 if (inst.reloc.exp.X_op == O_constant)
1728 {
1729 offset = inst.reloc.exp.X_add_number;
1730
1731 if (offset & 3)
1732 {
1733 inst.error = _("co-processor address must be word aligned");
1734 return FAIL;
1735 }
1736
1737 if (offset > 1023 || offset < -1023)
1738 {
1739 inst.error = _("offset too large");
1740 return FAIL;
1741 }
1742
1743 if (offset >= 0)
1744 inst.instruction |= INDEX_UP;
1745 else
1746 offset = -offset;
1747
1748 inst.instruction |= offset >> 2;
1749 }
1750 else
1751 inst.reloc.type = BFD_RELOC_ARM_CP_OFF_IMM;
1752
1753 return SUCCESS;
1754 }
1755
1756 static int
1757 cp_address_required_here (str)
1758 char ** str;
1759 {
1760 char * p = * str;
1761 int pre_inc = 0;
1762 int write_back = 0;
1763
1764 if (*p == '[')
1765 {
1766 int reg;
1767
1768 p++;
1769 skip_whitespace (p);
1770
1771 if ((reg = reg_required_here (& p, 16)) == FAIL)
1772 return FAIL;
1773
1774 skip_whitespace (p);
1775
1776 if (*p == ']')
1777 {
1778 p++;
1779
1780 if (skip_past_comma (& p) == SUCCESS)
1781 {
1782 /* [Rn], #expr */
1783 write_back = WRITE_BACK;
1784
1785 if (reg == REG_PC)
1786 {
1787 inst.error = _("pc may not be used in post-increment");
1788 return FAIL;
1789 }
1790
1791 if (cp_address_offset (& p) == FAIL)
1792 return FAIL;
1793 }
1794 else
1795 pre_inc = PRE_INDEX | INDEX_UP;
1796 }
1797 else
1798 {
1799 /* '['Rn, #expr']'[!] */
1800
1801 if (skip_past_comma (& p) == FAIL)
1802 {
1803 inst.error = _("pre-indexed expression expected");
1804 return FAIL;
1805 }
1806
1807 pre_inc = PRE_INDEX;
1808
1809 if (cp_address_offset (& p) == FAIL)
1810 return FAIL;
1811
1812 skip_whitespace (p);
1813
1814 if (*p++ != ']')
1815 {
1816 inst.error = _("missing ]");
1817 return FAIL;
1818 }
1819
1820 skip_whitespace (p);
1821
1822 if (*p == '!')
1823 {
1824 if (reg == REG_PC)
1825 {
1826 inst.error = _("pc may not be used with write-back");
1827 return FAIL;
1828 }
1829
1830 p++;
1831 write_back = WRITE_BACK;
1832 }
1833 }
1834 }
1835 else
1836 {
1837 if (my_get_expression (&inst.reloc.exp, &p))
1838 return FAIL;
1839
1840 inst.reloc.type = BFD_RELOC_ARM_CP_OFF_IMM;
1841 inst.reloc.exp.X_add_number -= 8; /* PC rel adjust */
1842 inst.reloc.pc_rel = 1;
1843 inst.instruction |= (REG_PC << 16);
1844 pre_inc = PRE_INDEX;
1845 }
1846
1847 inst.instruction |= write_back | pre_inc;
1848 *str = p;
1849 return SUCCESS;
1850 }
1851
1852 static void
1853 do_nop (str, flags)
1854 char * str;
1855 unsigned long flags;
1856 {
1857 /* Do nothing really. */
1858 inst.instruction |= flags; /* This is pointless. */
1859 end_of_line (str);
1860 return;
1861 }
1862
1863 static void
1864 do_mrs (str, flags)
1865 char *str;
1866 unsigned long flags;
1867 {
1868 /* Only one syntax. */
1869 skip_whitespace (str);
1870
1871 if (reg_required_here (&str, 12) == FAIL)
1872 {
1873 inst.error = BAD_ARGS;
1874 return;
1875 }
1876
1877 if (skip_past_comma (&str) == FAIL
1878 || psr_required_here (& str, CPSR_ALL, SPSR_ALL) == FAIL)
1879 {
1880 inst.error = _("<psr> expected");
1881 return;
1882 }
1883
1884 inst.instruction |= flags;
1885 end_of_line (str);
1886 return;
1887 }
1888
1889 /* Three possible forms: "<psr>, Rm", "<psrf>, Rm", "<psrf>, #expression". */
1890 static void
1891 do_msr (str, flags)
1892 char * str;
1893 unsigned long flags;
1894 {
1895 int reg;
1896
1897 skip_whitespace (str);
1898
1899 if (psr_required_here (&str, CPSR_ALL, SPSR_ALL) == SUCCESS)
1900 {
1901 inst.instruction |= PSR_ALL;
1902
1903 /* Sytax should be "<psr>, Rm" */
1904 if (skip_past_comma (&str) == FAIL
1905 || (reg = reg_required_here (&str, 0)) == FAIL)
1906 {
1907 inst.error = BAD_ARGS;
1908 return;
1909 }
1910 }
1911 else
1912 {
1913 if (psr_required_here (& str, CPSR_FLG, SPSR_FLG) == SUCCESS)
1914 inst.instruction |= PSR_FLAGS;
1915 else if (psr_required_here (& str, CPSR_CTL, SPSR_CTL) == SUCCESS)
1916 inst.instruction |= PSR_CONTROL;
1917 else
1918 {
1919 inst.error = BAD_ARGS;
1920 return;
1921 }
1922
1923 if (skip_past_comma (&str) == FAIL)
1924 {
1925 inst.error = BAD_ARGS;
1926 return;
1927 }
1928
1929 /* Syntax could be "<psrf>, rm", "<psrf>, #expression" */
1930
1931 if ((reg = reg_required_here (& str, 0)) != FAIL)
1932 ;
1933 /* Immediate expression. */
1934 else if (is_immediate_prefix (* str))
1935 {
1936 str ++;
1937 inst.error = NULL;
1938
1939 if (my_get_expression (& inst.reloc.exp, & str))
1940 {
1941 inst.error = _("Register or shift expression expected");
1942 return;
1943 }
1944
1945 if (inst.reloc.exp.X_add_symbol)
1946 {
1947 inst.reloc.type = BFD_RELOC_ARM_IMMEDIATE;
1948 inst.reloc.pc_rel = 0;
1949 }
1950 else
1951 {
1952 unsigned value = validate_immediate (inst.reloc.exp.X_add_number);
1953 if (value == (unsigned) FAIL)
1954 {
1955 inst.error = _("Invalid constant");
1956 return;
1957 }
1958
1959 inst.instruction |= value;
1960 }
1961
1962 flags |= INST_IMMEDIATE;
1963 }
1964 else
1965 {
1966 inst.error = _("Error: unrecognised syntax for second argument to msr instruction");
1967 return;
1968 }
1969 }
1970
1971 inst.error = NULL;
1972 inst.instruction |= flags;
1973 end_of_line (str);
1974 return;
1975 }
1976
1977 /* Long Multiply Parser
1978 UMULL RdLo, RdHi, Rm, Rs
1979 SMULL RdLo, RdHi, Rm, Rs
1980 UMLAL RdLo, RdHi, Rm, Rs
1981 SMLAL RdLo, RdHi, Rm, Rs
1982 */
1983 static void
1984 do_mull (str, flags)
1985 char * str;
1986 unsigned long flags;
1987 {
1988 int rdlo, rdhi, rm, rs;
1989
1990 /* Only one format "rdlo, rdhi, rm, rs" */
1991 skip_whitespace (str);
1992
1993 if ((rdlo = reg_required_here (&str, 12)) == FAIL)
1994 {
1995 inst.error = BAD_ARGS;
1996 return;
1997 }
1998
1999 if (skip_past_comma (&str) == FAIL
2000 || (rdhi = reg_required_here (&str, 16)) == FAIL)
2001 {
2002 inst.error = BAD_ARGS;
2003 return;
2004 }
2005
2006 if (skip_past_comma (&str) == FAIL
2007 || (rm = reg_required_here (&str, 0)) == FAIL)
2008 {
2009 inst.error = BAD_ARGS;
2010 return;
2011 }
2012
2013 /* rdhi, rdlo and rm must all be different */
2014 if (rdlo == rdhi || rdlo == rm || rdhi == rm)
2015 as_tsktsk (_("rdhi, rdlo and rm must all be different"));
2016
2017 if (skip_past_comma (&str) == FAIL
2018 || (rs = reg_required_here (&str, 8)) == FAIL)
2019 {
2020 inst.error = BAD_ARGS;
2021 return;
2022 }
2023
2024 if (rdhi == REG_PC || rdhi == REG_PC || rdhi == REG_PC || rdhi == REG_PC)
2025 {
2026 inst.error = BAD_PC;
2027 return;
2028 }
2029
2030 inst.instruction |= flags;
2031 end_of_line (str);
2032 return;
2033 }
2034
2035 static void
2036 do_mul (str, flags)
2037 char * str;
2038 unsigned long flags;
2039 {
2040 int rd, rm;
2041
2042 /* Only one format "rd, rm, rs" */
2043 skip_whitespace (str);
2044
2045 if ((rd = reg_required_here (&str, 16)) == FAIL)
2046 {
2047 inst.error = BAD_ARGS;
2048 return;
2049 }
2050
2051 if (rd == REG_PC)
2052 {
2053 inst.error = BAD_PC;
2054 return;
2055 }
2056
2057 if (skip_past_comma (&str) == FAIL
2058 || (rm = reg_required_here (&str, 0)) == FAIL)
2059 {
2060 inst.error = BAD_ARGS;
2061 return;
2062 }
2063
2064 if (rm == REG_PC)
2065 {
2066 inst.error = BAD_PC;
2067 return;
2068 }
2069
2070 if (rm == rd)
2071 as_tsktsk (_("rd and rm should be different in mul"));
2072
2073 if (skip_past_comma (&str) == FAIL
2074 || (rm = reg_required_here (&str, 8)) == FAIL)
2075 {
2076 inst.error = BAD_ARGS;
2077 return;
2078 }
2079
2080 if (rm == REG_PC)
2081 {
2082 inst.error = BAD_PC;
2083 return;
2084 }
2085
2086 inst.instruction |= flags;
2087 end_of_line (str);
2088 return;
2089 }
2090
2091 static void
2092 do_mla (str, flags)
2093 char * str;
2094 unsigned long flags;
2095 {
2096 int rd, rm;
2097
2098 /* Only one format "rd, rm, rs, rn" */
2099 skip_whitespace (str);
2100
2101 if ((rd = reg_required_here (&str, 16)) == FAIL)
2102 {
2103 inst.error = BAD_ARGS;
2104 return;
2105 }
2106
2107 if (rd == REG_PC)
2108 {
2109 inst.error = BAD_PC;
2110 return;
2111 }
2112
2113 if (skip_past_comma (&str) == FAIL
2114 || (rm = reg_required_here (&str, 0)) == FAIL)
2115 {
2116 inst.error = BAD_ARGS;
2117 return;
2118 }
2119
2120 if (rm == REG_PC)
2121 {
2122 inst.error = BAD_PC;
2123 return;
2124 }
2125
2126 if (rm == rd)
2127 as_tsktsk (_("rd and rm should be different in mla"));
2128
2129 if (skip_past_comma (&str) == FAIL
2130 || (rd = reg_required_here (&str, 8)) == FAIL
2131 || skip_past_comma (&str) == FAIL
2132 || (rm = reg_required_here (&str, 12)) == FAIL)
2133 {
2134 inst.error = BAD_ARGS;
2135 return;
2136 }
2137
2138 if (rd == REG_PC || rm == REG_PC)
2139 {
2140 inst.error = BAD_PC;
2141 return;
2142 }
2143
2144 inst.instruction |= flags;
2145 end_of_line (str);
2146 return;
2147 }
2148
2149 /* Returns the index into fp_values of a floating point number, or -1 if
2150 not in the table. */
2151 static int
2152 my_get_float_expression (str)
2153 char ** str;
2154 {
2155 LITTLENUM_TYPE words[MAX_LITTLENUMS];
2156 char * save_in;
2157 expressionS exp;
2158 int i;
2159 int j;
2160
2161 memset (words, 0, MAX_LITTLENUMS * sizeof (LITTLENUM_TYPE));
2162 /* Look for a raw floating point number */
2163 if ((save_in = atof_ieee (*str, 'x', words)) != NULL
2164 && (is_end_of_line [(int)(*save_in)] || *save_in == '\0'))
2165 {
2166 for (i = 0; i < NUM_FLOAT_VALS; i++)
2167 {
2168 for (j = 0; j < MAX_LITTLENUMS; j++)
2169 {
2170 if (words[j] != fp_values[i][j])
2171 break;
2172 }
2173
2174 if (j == MAX_LITTLENUMS)
2175 {
2176 *str = save_in;
2177 return i;
2178 }
2179 }
2180 }
2181
2182 /* Try and parse a more complex expression, this will probably fail
2183 unless the code uses a floating point prefix (eg "0f") */
2184 save_in = input_line_pointer;
2185 input_line_pointer = *str;
2186 if (expression (&exp) == absolute_section
2187 && exp.X_op == O_big
2188 && exp.X_add_number < 0)
2189 {
2190 /* FIXME: 5 = X_PRECISION, should be #define'd where we can use it.
2191 Ditto for 15. */
2192 if (gen_to_words (words, 5, (long)15) == 0)
2193 {
2194 for (i = 0; i < NUM_FLOAT_VALS; i++)
2195 {
2196 for (j = 0; j < MAX_LITTLENUMS; j++)
2197 {
2198 if (words[j] != fp_values[i][j])
2199 break;
2200 }
2201
2202 if (j == MAX_LITTLENUMS)
2203 {
2204 *str = input_line_pointer;
2205 input_line_pointer = save_in;
2206 return i;
2207 }
2208 }
2209 }
2210 }
2211
2212 *str = input_line_pointer;
2213 input_line_pointer = save_in;
2214 return -1;
2215 }
2216
2217 /* Return true if anything in the expression is a bignum */
2218 static int
2219 walk_no_bignums (sp)
2220 symbolS * sp;
2221 {
2222 if (symbol_get_value_expression (sp)->X_op == O_big)
2223 return 1;
2224
2225 if (symbol_get_value_expression (sp)->X_add_symbol)
2226 {
2227 return (walk_no_bignums (symbol_get_value_expression (sp)->X_add_symbol)
2228 || (symbol_get_value_expression (sp)->X_op_symbol
2229 && walk_no_bignums (symbol_get_value_expression (sp)->X_op_symbol)));
2230 }
2231
2232 return 0;
2233 }
2234
2235 static int
2236 my_get_expression (ep, str)
2237 expressionS * ep;
2238 char ** str;
2239 {
2240 char * save_in;
2241 segT seg;
2242
2243 save_in = input_line_pointer;
2244 input_line_pointer = *str;
2245 seg = expression (ep);
2246
2247 #ifdef OBJ_AOUT
2248 if (seg != absolute_section
2249 && seg != text_section
2250 && seg != data_section
2251 && seg != bss_section
2252 && seg != undefined_section)
2253 {
2254 inst.error = _("bad_segment");
2255 *str = input_line_pointer;
2256 input_line_pointer = save_in;
2257 return 1;
2258 }
2259 #endif
2260
2261 /* Get rid of any bignums now, so that we don't generate an error for which
2262 we can't establish a line number later on. Big numbers are never valid
2263 in instructions, which is where this routine is always called. */
2264 if (ep->X_op == O_big
2265 || (ep->X_add_symbol
2266 && (walk_no_bignums (ep->X_add_symbol)
2267 || (ep->X_op_symbol
2268 && walk_no_bignums (ep->X_op_symbol)))))
2269 {
2270 inst.error = _("Invalid constant");
2271 *str = input_line_pointer;
2272 input_line_pointer = save_in;
2273 return 1;
2274 }
2275
2276 *str = input_line_pointer;
2277 input_line_pointer = save_in;
2278 return 0;
2279 }
2280
2281 /* unrestrict should be one if <shift> <register> is permitted for this
2282 instruction */
2283
2284 static int
2285 decode_shift (str, unrestrict)
2286 char ** str;
2287 int unrestrict;
2288 {
2289 struct asm_shift * shft;
2290 char * p;
2291 char c;
2292
2293 skip_whitespace (* str);
2294
2295 for (p = *str; isalpha (*p); p++)
2296 ;
2297
2298 if (p == *str)
2299 {
2300 inst.error = _("Shift expression expected");
2301 return FAIL;
2302 }
2303
2304 c = *p;
2305 *p = '\0';
2306 shft = (struct asm_shift *) hash_find (arm_shift_hsh, *str);
2307 *p = c;
2308 if (shft)
2309 {
2310 if (!strncmp (*str, "rrx", 3)
2311 || !strncmp (*str, "RRX", 3))
2312 {
2313 *str = p;
2314 inst.instruction |= shft->value;
2315 return SUCCESS;
2316 }
2317
2318 skip_whitespace (p);
2319
2320 if (unrestrict && reg_required_here (&p, 8) != FAIL)
2321 {
2322 inst.instruction |= shft->value | SHIFT_BY_REG;
2323 *str = p;
2324 return SUCCESS;
2325 }
2326 else if (is_immediate_prefix (* p))
2327 {
2328 inst.error = NULL;
2329 p++;
2330 if (my_get_expression (&inst.reloc.exp, &p))
2331 return FAIL;
2332
2333 /* Validate some simple #expressions */
2334 if (inst.reloc.exp.X_op == O_constant)
2335 {
2336 unsigned num = inst.reloc.exp.X_add_number;
2337
2338 /* Reject operations greater than 32, or lsl #32 */
2339 if (num > 32 || (num == 32 && shft->value == 0))
2340 {
2341 inst.error = _("Invalid immediate shift");
2342 return FAIL;
2343 }
2344
2345 /* Shifts of zero should be converted to lsl (which is zero)*/
2346 if (num == 0)
2347 {
2348 *str = p;
2349 return SUCCESS;
2350 }
2351
2352 /* Shifts of 32 are encoded as 0, for those shifts that
2353 support it. */
2354 if (num == 32)
2355 num = 0;
2356
2357 inst.instruction |= (num << 7) | shft->value;
2358 *str = p;
2359 return SUCCESS;
2360 }
2361
2362 inst.reloc.type = BFD_RELOC_ARM_SHIFT_IMM;
2363 inst.reloc.pc_rel = 0;
2364 inst.instruction |= shft->value;
2365 *str = p;
2366 return SUCCESS;
2367 }
2368 else
2369 {
2370 inst.error = unrestrict ? _("shift requires register or #expression")
2371 : _("shift requires #expression");
2372 *str = p;
2373 return FAIL;
2374 }
2375 }
2376
2377 inst.error = _("Shift expression expected");
2378 return FAIL;
2379 }
2380
2381 /* Do those data_ops which can take a negative immediate constant */
2382 /* by altering the instuction. A bit of a hack really */
2383 /* MOV <-> MVN
2384 AND <-> BIC
2385 ADC <-> SBC
2386 by inverting the second operand, and
2387 ADD <-> SUB
2388 CMP <-> CMN
2389 by negating the second operand.
2390 */
2391 static int
2392 negate_data_op (instruction, value)
2393 unsigned long * instruction;
2394 unsigned long value;
2395 {
2396 int op, new_inst;
2397 unsigned long negated, inverted;
2398
2399 negated = validate_immediate (-value);
2400 inverted = validate_immediate (~value);
2401
2402 op = (*instruction >> DATA_OP_SHIFT) & 0xf;
2403 switch (op)
2404 {
2405 /* First negates */
2406 case OPCODE_SUB: /* ADD <-> SUB */
2407 new_inst = OPCODE_ADD;
2408 value = negated;
2409 break;
2410
2411 case OPCODE_ADD:
2412 new_inst = OPCODE_SUB;
2413 value = negated;
2414 break;
2415
2416 case OPCODE_CMP: /* CMP <-> CMN */
2417 new_inst = OPCODE_CMN;
2418 value = negated;
2419 break;
2420
2421 case OPCODE_CMN:
2422 new_inst = OPCODE_CMP;
2423 value = negated;
2424 break;
2425
2426 /* Now Inverted ops */
2427 case OPCODE_MOV: /* MOV <-> MVN */
2428 new_inst = OPCODE_MVN;
2429 value = inverted;
2430 break;
2431
2432 case OPCODE_MVN:
2433 new_inst = OPCODE_MOV;
2434 value = inverted;
2435 break;
2436
2437 case OPCODE_AND: /* AND <-> BIC */
2438 new_inst = OPCODE_BIC;
2439 value = inverted;
2440 break;
2441
2442 case OPCODE_BIC:
2443 new_inst = OPCODE_AND;
2444 value = inverted;
2445 break;
2446
2447 case OPCODE_ADC: /* ADC <-> SBC */
2448 new_inst = OPCODE_SBC;
2449 value = inverted;
2450 break;
2451
2452 case OPCODE_SBC:
2453 new_inst = OPCODE_ADC;
2454 value = inverted;
2455 break;
2456
2457 /* We cannot do anything */
2458 default:
2459 return FAIL;
2460 }
2461
2462 if (value == (unsigned) FAIL)
2463 return FAIL;
2464
2465 *instruction &= OPCODE_MASK;
2466 *instruction |= new_inst << DATA_OP_SHIFT;
2467 return value;
2468 }
2469
2470 static int
2471 data_op2 (str)
2472 char ** str;
2473 {
2474 int value;
2475 expressionS expr;
2476
2477 skip_whitespace (* str);
2478
2479 if (reg_required_here (str, 0) != FAIL)
2480 {
2481 if (skip_past_comma (str) == SUCCESS)
2482 /* Shift operation on register. */
2483 return decode_shift (str, NO_SHIFT_RESTRICT);
2484
2485 return SUCCESS;
2486 }
2487 else
2488 {
2489 /* Immediate expression */
2490 if (is_immediate_prefix (**str))
2491 {
2492 (*str)++;
2493 inst.error = NULL;
2494
2495 if (my_get_expression (&inst.reloc.exp, str))
2496 return FAIL;
2497
2498 if (inst.reloc.exp.X_add_symbol)
2499 {
2500 inst.reloc.type = BFD_RELOC_ARM_IMMEDIATE;
2501 inst.reloc.pc_rel = 0;
2502 }
2503 else
2504 {
2505 if (skip_past_comma (str) == SUCCESS)
2506 {
2507 /* #x, y -- ie explicit rotation by Y */
2508 if (my_get_expression (&expr, str))
2509 return FAIL;
2510
2511 if (expr.X_op != O_constant)
2512 {
2513 inst.error = _("Constant expression expected");
2514 return FAIL;
2515 }
2516
2517 /* Rotate must be a multiple of 2 */
2518 if (((unsigned) expr.X_add_number) > 30
2519 || (expr.X_add_number & 1) != 0
2520 || ((unsigned) inst.reloc.exp.X_add_number) > 255)
2521 {
2522 inst.error = _("Invalid constant");
2523 return FAIL;
2524 }
2525 inst.instruction |= INST_IMMEDIATE;
2526 inst.instruction |= inst.reloc.exp.X_add_number;
2527 inst.instruction |= expr.X_add_number << 7;
2528 return SUCCESS;
2529 }
2530
2531 /* Implicit rotation, select a suitable one */
2532 value = validate_immediate (inst.reloc.exp.X_add_number);
2533
2534 if (value == FAIL)
2535 {
2536 /* Can't be done, perhaps the code reads something like
2537 "add Rd, Rn, #-n", where "sub Rd, Rn, #n" would be ok */
2538 if ((value = negate_data_op (&inst.instruction,
2539 inst.reloc.exp.X_add_number))
2540 == FAIL)
2541 {
2542 inst.error = _("Invalid constant");
2543 return FAIL;
2544 }
2545 }
2546
2547 inst.instruction |= value;
2548 }
2549
2550 inst.instruction |= INST_IMMEDIATE;
2551 return SUCCESS;
2552 }
2553
2554 (*str)++;
2555 inst.error = _("Register or shift expression expected");
2556 return FAIL;
2557 }
2558 }
2559
2560 static int
2561 fp_op2 (str)
2562 char ** str;
2563 {
2564 skip_whitespace (* str);
2565
2566 if (fp_reg_required_here (str, 0) != FAIL)
2567 return SUCCESS;
2568 else
2569 {
2570 /* Immediate expression */
2571 if (*((*str)++) == '#')
2572 {
2573 int i;
2574
2575 inst.error = NULL;
2576
2577 skip_whitespace (* str);
2578
2579 /* First try and match exact strings, this is to guarantee that
2580 some formats will work even for cross assembly */
2581
2582 for (i = 0; fp_const[i]; i++)
2583 {
2584 if (strncmp (*str, fp_const[i], strlen (fp_const[i])) == 0)
2585 {
2586 char *start = *str;
2587
2588 *str += strlen (fp_const[i]);
2589 if (is_end_of_line[(int)**str] || **str == '\0')
2590 {
2591 inst.instruction |= i + 8;
2592 return SUCCESS;
2593 }
2594 *str = start;
2595 }
2596 }
2597
2598 /* Just because we didn't get a match doesn't mean that the
2599 constant isn't valid, just that it is in a format that we
2600 don't automatically recognize. Try parsing it with
2601 the standard expression routines. */
2602 if ((i = my_get_float_expression (str)) >= 0)
2603 {
2604 inst.instruction |= i + 8;
2605 return SUCCESS;
2606 }
2607
2608 inst.error = _("Invalid floating point immediate expression");
2609 return FAIL;
2610 }
2611 inst.error = _("Floating point register or immediate expression expected");
2612 return FAIL;
2613 }
2614 }
2615
2616 static void
2617 do_arit (str, flags)
2618 char * str;
2619 unsigned long flags;
2620 {
2621 skip_whitespace (str);
2622
2623 if (reg_required_here (&str, 12) == FAIL
2624 || skip_past_comma (&str) == FAIL
2625 || reg_required_here (&str, 16) == FAIL
2626 || skip_past_comma (&str) == FAIL
2627 || data_op2 (&str) == FAIL)
2628 {
2629 if (!inst.error)
2630 inst.error = BAD_ARGS;
2631 return;
2632 }
2633
2634 inst.instruction |= flags;
2635 end_of_line (str);
2636 return;
2637 }
2638
2639 static void
2640 do_adr (str, flags)
2641 char * str;
2642 unsigned long flags;
2643 {
2644 /* This is a pseudo-op of the form "adr rd, label" to be converted
2645 into a relative address of the form "add rd, pc, #label-.-8" */
2646
2647 skip_whitespace (str);
2648
2649 if (reg_required_here (&str, 12) == FAIL
2650 || skip_past_comma (&str) == FAIL
2651 || my_get_expression (&inst.reloc.exp, &str))
2652 {
2653 if (!inst.error)
2654 inst.error = BAD_ARGS;
2655 return;
2656 }
2657 /* Frag hacking will turn this into a sub instruction if the offset turns
2658 out to be negative. */
2659 inst.reloc.type = BFD_RELOC_ARM_IMMEDIATE;
2660 inst.reloc.exp.X_add_number -= 8; /* PC relative adjust */
2661 inst.reloc.pc_rel = 1;
2662 inst.instruction |= flags;
2663 end_of_line (str);
2664 return;
2665 }
2666
2667 static void
2668 do_adrl (str, flags)
2669 char * str;
2670 unsigned long flags;
2671 {
2672 /* This is a pseudo-op of the form "adrl rd, label" to be converted
2673 into a relative address of the form:
2674 add rd, pc, #low(label-.-8)"
2675 add rd, rd, #high(label-.-8)" */
2676
2677 skip_whitespace (str);
2678
2679 if (reg_required_here (& str, 12) == FAIL
2680 || skip_past_comma (& str) == FAIL
2681 || my_get_expression (& inst.reloc.exp, & str))
2682 {
2683 if (!inst.error)
2684 inst.error = BAD_ARGS;
2685 return;
2686 }
2687
2688 end_of_line (str);
2689
2690 /* Frag hacking will turn this into a sub instruction if the offset turns
2691 out to be negative. */
2692 inst.reloc.type = BFD_RELOC_ARM_ADRL_IMMEDIATE;
2693 inst.reloc.exp.X_add_number -= 8; /* PC relative adjust */
2694 inst.reloc.pc_rel = 1;
2695 inst.instruction |= flags;
2696 inst.size = INSN_SIZE * 2;
2697
2698 return;
2699 }
2700
2701 static void
2702 do_cmp (str, flags)
2703 char * str;
2704 unsigned long flags;
2705 {
2706 skip_whitespace (str);
2707
2708 if (reg_required_here (&str, 16) == FAIL)
2709 {
2710 if (!inst.error)
2711 inst.error = BAD_ARGS;
2712 return;
2713 }
2714
2715 if (skip_past_comma (&str) == FAIL
2716 || data_op2 (&str) == FAIL)
2717 {
2718 if (!inst.error)
2719 inst.error = BAD_ARGS;
2720 return;
2721 }
2722
2723 inst.instruction |= flags;
2724 if ((flags & 0x0000f000) == 0)
2725 inst.instruction |= CONDS_BIT;
2726
2727 end_of_line (str);
2728 return;
2729 }
2730
2731 static void
2732 do_mov (str, flags)
2733 char * str;
2734 unsigned long flags;
2735 {
2736 skip_whitespace (str);
2737
2738 if (reg_required_here (&str, 12) == FAIL)
2739 {
2740 if (!inst.error)
2741 inst.error = BAD_ARGS;
2742 return;
2743 }
2744
2745 if (skip_past_comma (&str) == FAIL
2746 || data_op2 (&str) == FAIL)
2747 {
2748 if (!inst.error)
2749 inst.error = BAD_ARGS;
2750 return;
2751 }
2752
2753 inst.instruction |= flags;
2754 end_of_line (str);
2755 return;
2756 }
2757
2758 static int
2759 ldst_extend (str, hwse)
2760 char ** str;
2761 int hwse;
2762 {
2763 int add = INDEX_UP;
2764
2765 switch (**str)
2766 {
2767 case '#':
2768 case '$':
2769 (*str)++;
2770 if (my_get_expression (& inst.reloc.exp, str))
2771 return FAIL;
2772
2773 if (inst.reloc.exp.X_op == O_constant)
2774 {
2775 int value = inst.reloc.exp.X_add_number;
2776
2777 if ((hwse && (value < -255 || value > 255))
2778 || (value < -4095 || value > 4095))
2779 {
2780 inst.error = _("address offset too large");
2781 return FAIL;
2782 }
2783
2784 if (value < 0)
2785 {
2786 value = -value;
2787 add = 0;
2788 }
2789
2790 /* Halfword and signextension instructions have the
2791 immediate value split across bits 11..8 and bits 3..0 */
2792 if (hwse)
2793 inst.instruction |= add | HWOFFSET_IMM | ((value >> 4) << 8) | (value & 0xF);
2794 else
2795 inst.instruction |= add | value;
2796 }
2797 else
2798 {
2799 if (hwse)
2800 {
2801 inst.instruction |= HWOFFSET_IMM;
2802 inst.reloc.type = BFD_RELOC_ARM_OFFSET_IMM8;
2803 }
2804 else
2805 inst.reloc.type = BFD_RELOC_ARM_OFFSET_IMM;
2806 inst.reloc.pc_rel = 0;
2807 }
2808 return SUCCESS;
2809
2810 case '-':
2811 add = 0; /* and fall through */
2812 case '+':
2813 (*str)++; /* and fall through */
2814 default:
2815 if (reg_required_here (str, 0) == FAIL)
2816 return FAIL;
2817
2818 if (hwse)
2819 inst.instruction |= add;
2820 else
2821 {
2822 inst.instruction |= add | OFFSET_REG;
2823 if (skip_past_comma (str) == SUCCESS)
2824 return decode_shift (str, SHIFT_RESTRICT);
2825 }
2826
2827 return SUCCESS;
2828 }
2829 }
2830
2831 static void
2832 do_ldst (str, flags)
2833 char * str;
2834 unsigned long flags;
2835 {
2836 int halfword = 0;
2837 int pre_inc = 0;
2838 int conflict_reg;
2839 int value;
2840
2841 /* This is not ideal, but it is the simplest way of dealing with the
2842 ARM7T halfword instructions (since they use a different
2843 encoding, but the same mnemonic): */
2844 halfword = (flags & 0x80000000) != 0;
2845 if (halfword)
2846 {
2847 /* This is actually a load/store of a halfword, or a
2848 signed-extension load */
2849 if ((cpu_variant & ARM_HALFWORD) == 0)
2850 {
2851 inst.error
2852 = _("Processor does not support halfwords or signed bytes");
2853 return;
2854 }
2855
2856 inst.instruction = (inst.instruction & COND_MASK)
2857 | (flags & ~COND_MASK);
2858
2859 flags = 0;
2860 }
2861
2862 skip_whitespace (str);
2863
2864 if ((conflict_reg = reg_required_here (& str, 12)) == FAIL)
2865 {
2866 if (!inst.error)
2867 inst.error = BAD_ARGS;
2868 return;
2869 }
2870
2871 if (skip_past_comma (& str) == FAIL)
2872 {
2873 inst.error = _("Address expected");
2874 return;
2875 }
2876
2877 if (*str == '[')
2878 {
2879 int reg;
2880
2881 str++;
2882
2883 skip_whitespace (str);
2884
2885 if ((reg = reg_required_here (&str, 16)) == FAIL)
2886 return;
2887
2888 /* Conflicts can occur on stores as well as loads. */
2889 conflict_reg = (conflict_reg == reg);
2890
2891 skip_whitespace (str);
2892
2893 if (*str == ']')
2894 {
2895 str ++;
2896
2897 if (skip_past_comma (&str) == SUCCESS)
2898 {
2899 /* [Rn],... (post inc) */
2900 if (ldst_extend (&str, halfword) == FAIL)
2901 return;
2902 if (conflict_reg)
2903 as_warn (_("%s register same as write-back base"),
2904 (inst.instruction & LOAD_BIT) ? _("destination") : _("source") );
2905 }
2906 else
2907 {
2908 /* [Rn] */
2909 if (halfword)
2910 inst.instruction |= HWOFFSET_IMM;
2911
2912 skip_whitespace (str);
2913
2914 if (*str == '!')
2915 {
2916 if (conflict_reg)
2917 as_warn (_("%s register same as write-back base"),
2918 (inst.instruction & LOAD_BIT) ? _("destination") : _("source") );
2919 str++;
2920 inst.instruction |= WRITE_BACK;
2921 }
2922
2923 flags |= INDEX_UP;
2924 if (! (flags & TRANS_BIT))
2925 pre_inc = 1;
2926 }
2927 }
2928 else
2929 {
2930 /* [Rn,...] */
2931 if (skip_past_comma (&str) == FAIL)
2932 {
2933 inst.error = _("pre-indexed expression expected");
2934 return;
2935 }
2936
2937 pre_inc = 1;
2938 if (ldst_extend (&str, halfword) == FAIL)
2939 return;
2940
2941 skip_whitespace (str);
2942
2943 if (*str++ != ']')
2944 {
2945 inst.error = _("missing ]");
2946 return;
2947 }
2948
2949 skip_whitespace (str);
2950
2951 if (*str == '!')
2952 {
2953 if (conflict_reg)
2954 as_warn (_("%s register same as write-back base"),
2955 (inst.instruction & LOAD_BIT) ? _("destination") : _("source") );
2956 str++;
2957 inst.instruction |= WRITE_BACK;
2958 }
2959 }
2960 }
2961 else if (*str == '=')
2962 {
2963 /* Parse an "ldr Rd, =expr" instruction; this is another pseudo op */
2964 str++;
2965
2966 skip_whitespace (str);
2967
2968 if (my_get_expression (&inst.reloc.exp, &str))
2969 return;
2970
2971 if (inst.reloc.exp.X_op != O_constant
2972 && inst.reloc.exp.X_op != O_symbol)
2973 {
2974 inst.error = _("Constant expression expected");
2975 return;
2976 }
2977
2978 if (inst.reloc.exp.X_op == O_constant
2979 && (value = validate_immediate(inst.reloc.exp.X_add_number)) != FAIL)
2980 {
2981 /* This can be done with a mov instruction */
2982 inst.instruction &= LITERAL_MASK;
2983 inst.instruction |= INST_IMMEDIATE | (OPCODE_MOV << DATA_OP_SHIFT);
2984 inst.instruction |= (flags & COND_MASK) | (value & 0xfff);
2985 end_of_line(str);
2986 return;
2987 }
2988 else
2989 {
2990 /* Insert into literal pool */
2991 if (add_to_lit_pool () == FAIL)
2992 {
2993 if (!inst.error)
2994 inst.error = _("literal pool insertion failed");
2995 return;
2996 }
2997
2998 /* Change the instruction exp to point to the pool */
2999 if (halfword)
3000 {
3001 inst.instruction |= HWOFFSET_IMM;
3002 inst.reloc.type = BFD_RELOC_ARM_HWLITERAL;
3003 }
3004 else
3005 inst.reloc.type = BFD_RELOC_ARM_LITERAL;
3006 inst.reloc.pc_rel = 1;
3007 inst.instruction |= (REG_PC << 16);
3008 pre_inc = 1;
3009 }
3010 }
3011 else
3012 {
3013 if (my_get_expression (&inst.reloc.exp, &str))
3014 return;
3015
3016 if (halfword)
3017 {
3018 inst.instruction |= HWOFFSET_IMM;
3019 inst.reloc.type = BFD_RELOC_ARM_OFFSET_IMM8;
3020 }
3021 else
3022 inst.reloc.type = BFD_RELOC_ARM_OFFSET_IMM;
3023 #ifndef TE_WINCE
3024 inst.reloc.exp.X_add_number -= 8; /* PC rel adjust */
3025 #endif
3026 inst.reloc.pc_rel = 1;
3027 inst.instruction |= (REG_PC << 16);
3028 pre_inc = 1;
3029 }
3030
3031 if (pre_inc && (flags & TRANS_BIT))
3032 inst.error = _("Pre-increment instruction with translate");
3033
3034 inst.instruction |= flags | (pre_inc ? PRE_INDEX : 0);
3035 end_of_line (str);
3036 return;
3037 }
3038
3039 static long
3040 reg_list (strp)
3041 char ** strp;
3042 {
3043 char * str = *strp;
3044 long range = 0;
3045 int another_range;
3046
3047 /* We come back here if we get ranges concatenated by '+' or '|' */
3048 do
3049 {
3050 another_range = 0;
3051
3052 if (*str == '{')
3053 {
3054 int in_range = 0;
3055 int cur_reg = -1;
3056
3057 str++;
3058 do
3059 {
3060 int reg;
3061
3062 skip_whitespace (str);
3063
3064 if ((reg = reg_required_here (& str, -1)) == FAIL)
3065 return FAIL;
3066
3067 if (in_range)
3068 {
3069 int i;
3070
3071 if (reg <= cur_reg)
3072 {
3073 inst.error = _("Bad range in register list");
3074 return FAIL;
3075 }
3076
3077 for (i = cur_reg + 1; i < reg; i++)
3078 {
3079 if (range & (1 << i))
3080 as_tsktsk
3081 (_("Warning: Duplicated register (r%d) in register list"),
3082 i);
3083 else
3084 range |= 1 << i;
3085 }
3086 in_range = 0;
3087 }
3088
3089 if (range & (1 << reg))
3090 as_tsktsk (_("Warning: Duplicated register (r%d) in register list"),
3091 reg);
3092 else if (reg <= cur_reg)
3093 as_tsktsk (_("Warning: Register range not in ascending order"));
3094
3095 range |= 1 << reg;
3096 cur_reg = reg;
3097 } while (skip_past_comma (&str) != FAIL
3098 || (in_range = 1, *str++ == '-'));
3099 str--;
3100 skip_whitespace (str);
3101
3102 if (*str++ != '}')
3103 {
3104 inst.error = _("Missing `}'");
3105 return FAIL;
3106 }
3107 }
3108 else
3109 {
3110 expressionS expr;
3111
3112 if (my_get_expression (&expr, &str))
3113 return FAIL;
3114
3115 if (expr.X_op == O_constant)
3116 {
3117 if (expr.X_add_number
3118 != (expr.X_add_number & 0x0000ffff))
3119 {
3120 inst.error = _("invalid register mask");
3121 return FAIL;
3122 }
3123
3124 if ((range & expr.X_add_number) != 0)
3125 {
3126 int regno = range & expr.X_add_number;
3127
3128 regno &= -regno;
3129 regno = (1 << regno) - 1;
3130 as_tsktsk
3131 (_("Warning: Duplicated register (r%d) in register list"),
3132 regno);
3133 }
3134
3135 range |= expr.X_add_number;
3136 }
3137 else
3138 {
3139 if (inst.reloc.type != 0)
3140 {
3141 inst.error = _("expression too complex");
3142 return FAIL;
3143 }
3144
3145 memcpy (&inst.reloc.exp, &expr, sizeof (expressionS));
3146 inst.reloc.type = BFD_RELOC_ARM_MULTI;
3147 inst.reloc.pc_rel = 0;
3148 }
3149 }
3150
3151 skip_whitespace (str);
3152
3153 if (*str == '|' || *str == '+')
3154 {
3155 str++;
3156 another_range = 1;
3157 }
3158 } while (another_range);
3159
3160 *strp = str;
3161 return range;
3162 }
3163
3164 static void
3165 do_ldmstm (str, flags)
3166 char * str;
3167 unsigned long flags;
3168 {
3169 int base_reg;
3170 long range;
3171
3172 skip_whitespace (str);
3173
3174 if ((base_reg = reg_required_here (&str, 16)) == FAIL)
3175 return;
3176
3177 if (base_reg == REG_PC)
3178 {
3179 inst.error = _("r15 not allowed as base register");
3180 return;
3181 }
3182
3183 skip_whitespace (str);
3184
3185 if (*str == '!')
3186 {
3187 flags |= WRITE_BACK;
3188 str++;
3189 }
3190
3191 if (skip_past_comma (&str) == FAIL
3192 || (range = reg_list (&str)) == FAIL)
3193 {
3194 if (! inst.error)
3195 inst.error = BAD_ARGS;
3196 return;
3197 }
3198
3199 if (*str == '^')
3200 {
3201 str++;
3202 flags |= LDM_TYPE_2_OR_3;
3203 }
3204
3205 inst.instruction |= flags | range;
3206 end_of_line (str);
3207 return;
3208 }
3209
3210 static void
3211 do_swi (str, flags)
3212 char * str;
3213 unsigned long flags;
3214 {
3215 skip_whitespace (str);
3216
3217 /* Allow optional leading '#'. */
3218 if (is_immediate_prefix (*str))
3219 str++;
3220
3221 if (my_get_expression (& inst.reloc.exp, & str))
3222 return;
3223
3224 inst.reloc.type = BFD_RELOC_ARM_SWI;
3225 inst.reloc.pc_rel = 0;
3226 inst.instruction |= flags;
3227
3228 end_of_line (str);
3229
3230 return;
3231 }
3232
3233 static void
3234 do_swap (str, flags)
3235 char * str;
3236 unsigned long flags;
3237 {
3238 int reg;
3239
3240 skip_whitespace (str);
3241
3242 if ((reg = reg_required_here (&str, 12)) == FAIL)
3243 return;
3244
3245 if (reg == REG_PC)
3246 {
3247 inst.error = _("r15 not allowed in swap");
3248 return;
3249 }
3250
3251 if (skip_past_comma (&str) == FAIL
3252 || (reg = reg_required_here (&str, 0)) == FAIL)
3253 {
3254 if (!inst.error)
3255 inst.error = BAD_ARGS;
3256 return;
3257 }
3258
3259 if (reg == REG_PC)
3260 {
3261 inst.error = _("r15 not allowed in swap");
3262 return;
3263 }
3264
3265 if (skip_past_comma (&str) == FAIL
3266 || *str++ != '[')
3267 {
3268 inst.error = BAD_ARGS;
3269 return;
3270 }
3271
3272 skip_whitespace (str);
3273
3274 if ((reg = reg_required_here (&str, 16)) == FAIL)
3275 return;
3276
3277 if (reg == REG_PC)
3278 {
3279 inst.error = BAD_PC;
3280 return;
3281 }
3282
3283 skip_whitespace (str);
3284
3285 if (*str++ != ']')
3286 {
3287 inst.error = _("missing ]");
3288 return;
3289 }
3290
3291 inst.instruction |= flags;
3292 end_of_line (str);
3293 return;
3294 }
3295
3296 static void
3297 do_branch (str, flags)
3298 char * str;
3299 unsigned long flags ATTRIBUTE_UNUSED;
3300 {
3301 if (my_get_expression (&inst.reloc.exp, &str))
3302 return;
3303
3304 #ifdef OBJ_ELF
3305 {
3306 char * save_in;
3307
3308 /* ScottB: February 5, 1998 */
3309 /* Check to see of PLT32 reloc required for the instruction. */
3310
3311 /* arm_parse_reloc() works on input_line_pointer.
3312 We actually want to parse the operands to the branch instruction
3313 passed in 'str'. Save the input pointer and restore it later. */
3314 save_in = input_line_pointer;
3315 input_line_pointer = str;
3316 if (inst.reloc.exp.X_op == O_symbol
3317 && *str == '('
3318 && arm_parse_reloc () == BFD_RELOC_ARM_PLT32)
3319 {
3320 inst.reloc.type = BFD_RELOC_ARM_PLT32;
3321 inst.reloc.pc_rel = 0;
3322 /* Modify str to point to after parsed operands, otherwise
3323 end_of_line() will complain about the (PLT) left in str. */
3324 str = input_line_pointer;
3325 }
3326 else
3327 {
3328 inst.reloc.type = BFD_RELOC_ARM_PCREL_BRANCH;
3329 inst.reloc.pc_rel = 1;
3330 }
3331 input_line_pointer = save_in;
3332 }
3333 #else
3334 inst.reloc.type = BFD_RELOC_ARM_PCREL_BRANCH;
3335 inst.reloc.pc_rel = 1;
3336 #endif /* OBJ_ELF */
3337
3338 end_of_line (str);
3339 return;
3340 }
3341
3342 static void
3343 do_bx (str, flags)
3344 char * str;
3345 unsigned long flags ATTRIBUTE_UNUSED;
3346 {
3347 int reg;
3348
3349 skip_whitespace (str);
3350
3351 if ((reg = reg_required_here (&str, 0)) == FAIL)
3352 {
3353 inst.error = BAD_ARGS;
3354 return;
3355 }
3356
3357 if (reg == REG_PC)
3358 inst.error = BAD_PC;
3359
3360 end_of_line (str);
3361 }
3362
3363 static void
3364 do_cdp (str, flags)
3365 char * str;
3366 unsigned long flags ATTRIBUTE_UNUSED;
3367 {
3368 /* Co-processor data operation.
3369 Format: CDP{cond} CP#,<expr>,CRd,CRn,CRm{,<expr>} */
3370 skip_whitespace (str);
3371
3372 if (co_proc_number (&str) == FAIL)
3373 {
3374 if (!inst.error)
3375 inst.error = BAD_ARGS;
3376 return;
3377 }
3378
3379 if (skip_past_comma (&str) == FAIL
3380 || cp_opc_expr (&str, 20,4) == FAIL)
3381 {
3382 if (!inst.error)
3383 inst.error = BAD_ARGS;
3384 return;
3385 }
3386
3387 if (skip_past_comma (&str) == FAIL
3388 || cp_reg_required_here (&str, 12) == FAIL)
3389 {
3390 if (!inst.error)
3391 inst.error = BAD_ARGS;
3392 return;
3393 }
3394
3395 if (skip_past_comma (&str) == FAIL
3396 || cp_reg_required_here (&str, 16) == FAIL)
3397 {
3398 if (!inst.error)
3399 inst.error = BAD_ARGS;
3400 return;
3401 }
3402
3403 if (skip_past_comma (&str) == FAIL
3404 || cp_reg_required_here (&str, 0) == FAIL)
3405 {
3406 if (!inst.error)
3407 inst.error = BAD_ARGS;
3408 return;
3409 }
3410
3411 if (skip_past_comma (&str) == SUCCESS)
3412 {
3413 if (cp_opc_expr (&str, 5, 3) == FAIL)
3414 {
3415 if (!inst.error)
3416 inst.error = BAD_ARGS;
3417 return;
3418 }
3419 }
3420
3421 end_of_line (str);
3422 return;
3423 }
3424
3425 static void
3426 do_lstc (str, flags)
3427 char * str;
3428 unsigned long flags;
3429 {
3430 /* Co-processor register load/store.
3431 Format: <LDC|STC{cond}[L] CP#,CRd,<address> */
3432
3433 skip_whitespace (str);
3434
3435 if (co_proc_number (&str) == FAIL)
3436 {
3437 if (!inst.error)
3438 inst.error = BAD_ARGS;
3439 return;
3440 }
3441
3442 if (skip_past_comma (&str) == FAIL
3443 || cp_reg_required_here (&str, 12) == FAIL)
3444 {
3445 if (!inst.error)
3446 inst.error = BAD_ARGS;
3447 return;
3448 }
3449
3450 if (skip_past_comma (&str) == FAIL
3451 || cp_address_required_here (&str) == FAIL)
3452 {
3453 if (! inst.error)
3454 inst.error = BAD_ARGS;
3455 return;
3456 }
3457
3458 inst.instruction |= flags;
3459 end_of_line (str);
3460 return;
3461 }
3462
3463 static void
3464 do_co_reg (str, flags)
3465 char * str;
3466 unsigned long flags;
3467 {
3468 /* Co-processor register transfer.
3469 Format: <MCR|MRC>{cond} CP#,<expr1>,Rd,CRn,CRm{,<expr2>} */
3470
3471 skip_whitespace (str);
3472
3473 if (co_proc_number (&str) == FAIL)
3474 {
3475 if (!inst.error)
3476 inst.error = BAD_ARGS;
3477 return;
3478 }
3479
3480 if (skip_past_comma (&str) == FAIL
3481 || cp_opc_expr (&str, 21, 3) == FAIL)
3482 {
3483 if (!inst.error)
3484 inst.error = BAD_ARGS;
3485 return;
3486 }
3487
3488 if (skip_past_comma (&str) == FAIL
3489 || reg_required_here (&str, 12) == FAIL)
3490 {
3491 if (!inst.error)
3492 inst.error = BAD_ARGS;
3493 return;
3494 }
3495
3496 if (skip_past_comma (&str) == FAIL
3497 || cp_reg_required_here (&str, 16) == FAIL)
3498 {
3499 if (!inst.error)
3500 inst.error = BAD_ARGS;
3501 return;
3502 }
3503
3504 if (skip_past_comma (&str) == FAIL
3505 || cp_reg_required_here (&str, 0) == FAIL)
3506 {
3507 if (!inst.error)
3508 inst.error = BAD_ARGS;
3509 return;
3510 }
3511
3512 if (skip_past_comma (&str) == SUCCESS)
3513 {
3514 if (cp_opc_expr (&str, 5, 3) == FAIL)
3515 {
3516 if (!inst.error)
3517 inst.error = BAD_ARGS;
3518 return;
3519 }
3520 }
3521 if (flags)
3522 {
3523 inst.error = BAD_COND;
3524 }
3525
3526 end_of_line (str);
3527 return;
3528 }
3529
3530 static void
3531 do_fp_ctrl (str, flags)
3532 char * str;
3533 unsigned long flags ATTRIBUTE_UNUSED;
3534 {
3535 /* FP control registers.
3536 Format: <WFS|RFS|WFC|RFC>{cond} Rn */
3537
3538 skip_whitespace (str);
3539
3540 if (reg_required_here (&str, 12) == FAIL)
3541 {
3542 if (!inst.error)
3543 inst.error = BAD_ARGS;
3544 return;
3545 }
3546
3547 end_of_line (str);
3548 return;
3549 }
3550
3551 static void
3552 do_fp_ldst (str, flags)
3553 char * str;
3554 unsigned long flags ATTRIBUTE_UNUSED;
3555 {
3556 skip_whitespace (str);
3557
3558 switch (inst.suffix)
3559 {
3560 case SUFF_S:
3561 break;
3562 case SUFF_D:
3563 inst.instruction |= CP_T_X;
3564 break;
3565 case SUFF_E:
3566 inst.instruction |= CP_T_Y;
3567 break;
3568 case SUFF_P:
3569 inst.instruction |= CP_T_X | CP_T_Y;
3570 break;
3571 default:
3572 abort ();
3573 }
3574
3575 if (fp_reg_required_here (&str, 12) == FAIL)
3576 {
3577 if (!inst.error)
3578 inst.error = BAD_ARGS;
3579 return;
3580 }
3581
3582 if (skip_past_comma (&str) == FAIL
3583 || cp_address_required_here (&str) == FAIL)
3584 {
3585 if (!inst.error)
3586 inst.error = BAD_ARGS;
3587 return;
3588 }
3589
3590 end_of_line (str);
3591 }
3592
3593 static void
3594 do_fp_ldmstm (str, flags)
3595 char * str;
3596 unsigned long flags;
3597 {
3598 int num_regs;
3599
3600 skip_whitespace (str);
3601
3602 if (fp_reg_required_here (&str, 12) == FAIL)
3603 {
3604 if (! inst.error)
3605 inst.error = BAD_ARGS;
3606 return;
3607 }
3608
3609 /* Get Number of registers to transfer */
3610 if (skip_past_comma (&str) == FAIL
3611 || my_get_expression (&inst.reloc.exp, &str))
3612 {
3613 if (! inst.error)
3614 inst.error = _("constant expression expected");
3615 return;
3616 }
3617
3618 if (inst.reloc.exp.X_op != O_constant)
3619 {
3620 inst.error = _("Constant value required for number of registers");
3621 return;
3622 }
3623
3624 num_regs = inst.reloc.exp.X_add_number;
3625
3626 if (num_regs < 1 || num_regs > 4)
3627 {
3628 inst.error = _("number of registers must be in the range [1:4]");
3629 return;
3630 }
3631
3632 switch (num_regs)
3633 {
3634 case 1:
3635 inst.instruction |= CP_T_X;
3636 break;
3637 case 2:
3638 inst.instruction |= CP_T_Y;
3639 break;
3640 case 3:
3641 inst.instruction |= CP_T_Y | CP_T_X;
3642 break;
3643 case 4:
3644 break;
3645 default:
3646 abort ();
3647 }
3648
3649 if (flags)
3650 {
3651 int reg;
3652 int write_back;
3653 int offset;
3654
3655 /* The instruction specified "ea" or "fd", so we can only accept
3656 [Rn]{!}. The instruction does not really support stacking or
3657 unstacking, so we have to emulate these by setting appropriate
3658 bits and offsets. */
3659 if (skip_past_comma (&str) == FAIL
3660 || *str != '[')
3661 {
3662 if (! inst.error)
3663 inst.error = BAD_ARGS;
3664 return;
3665 }
3666
3667 str++;
3668 skip_whitespace (str);
3669
3670 if ((reg = reg_required_here (&str, 16)) == FAIL)
3671 return;
3672
3673 skip_whitespace (str);
3674
3675 if (*str != ']')
3676 {
3677 inst.error = BAD_ARGS;
3678 return;
3679 }
3680
3681 str++;
3682 if (*str == '!')
3683 {
3684 write_back = 1;
3685 str++;
3686 if (reg == REG_PC)
3687 {
3688 inst.error = _("R15 not allowed as base register with write-back");
3689 return;
3690 }
3691 }
3692 else
3693 write_back = 0;
3694
3695 if (flags & CP_T_Pre)
3696 {
3697 /* Pre-decrement */
3698 offset = 3 * num_regs;
3699 if (write_back)
3700 flags |= CP_T_WB;
3701 }
3702 else
3703 {
3704 /* Post-increment */
3705 if (write_back)
3706 {
3707 flags |= CP_T_WB;
3708 offset = 3 * num_regs;
3709 }
3710 else
3711 {
3712 /* No write-back, so convert this into a standard pre-increment
3713 instruction -- aesthetically more pleasing. */
3714 flags = CP_T_Pre | CP_T_UD;
3715 offset = 0;
3716 }
3717 }
3718
3719 inst.instruction |= flags | offset;
3720 }
3721 else if (skip_past_comma (&str) == FAIL
3722 || cp_address_required_here (&str) == FAIL)
3723 {
3724 if (! inst.error)
3725 inst.error = BAD_ARGS;
3726 return;
3727 }
3728
3729 end_of_line (str);
3730 }
3731
3732 static void
3733 do_fp_dyadic (str, flags)
3734 char * str;
3735 unsigned long flags;
3736 {
3737 skip_whitespace (str);
3738
3739 switch (inst.suffix)
3740 {
3741 case SUFF_S:
3742 break;
3743 case SUFF_D:
3744 inst.instruction |= 0x00000080;
3745 break;
3746 case SUFF_E:
3747 inst.instruction |= 0x00080000;
3748 break;
3749 default:
3750 abort ();
3751 }
3752
3753 if (fp_reg_required_here (&str, 12) == FAIL)
3754 {
3755 if (! inst.error)
3756 inst.error = BAD_ARGS;
3757 return;
3758 }
3759
3760 if (skip_past_comma (&str) == FAIL
3761 || fp_reg_required_here (&str, 16) == FAIL)
3762 {
3763 if (! inst.error)
3764 inst.error = BAD_ARGS;
3765 return;
3766 }
3767
3768 if (skip_past_comma (&str) == FAIL
3769 || fp_op2 (&str) == FAIL)
3770 {
3771 if (! inst.error)
3772 inst.error = BAD_ARGS;
3773 return;
3774 }
3775
3776 inst.instruction |= flags;
3777 end_of_line (str);
3778 return;
3779 }
3780
3781 static void
3782 do_fp_monadic (str, flags)
3783 char * str;
3784 unsigned long flags;
3785 {
3786 skip_whitespace (str);
3787
3788 switch (inst.suffix)
3789 {
3790 case SUFF_S:
3791 break;
3792 case SUFF_D:
3793 inst.instruction |= 0x00000080;
3794 break;
3795 case SUFF_E:
3796 inst.instruction |= 0x00080000;
3797 break;
3798 default:
3799 abort ();
3800 }
3801
3802 if (fp_reg_required_here (&str, 12) == FAIL)
3803 {
3804 if (! inst.error)
3805 inst.error = BAD_ARGS;
3806 return;
3807 }
3808
3809 if (skip_past_comma (&str) == FAIL
3810 || fp_op2 (&str) == FAIL)
3811 {
3812 if (! inst.error)
3813 inst.error = BAD_ARGS;
3814 return;
3815 }
3816
3817 inst.instruction |= flags;
3818 end_of_line (str);
3819 return;
3820 }
3821
3822 static void
3823 do_fp_cmp (str, flags)
3824 char * str;
3825 unsigned long flags;
3826 {
3827 skip_whitespace (str);
3828
3829 if (fp_reg_required_here (&str, 16) == FAIL)
3830 {
3831 if (! inst.error)
3832 inst.error = BAD_ARGS;
3833 return;
3834 }
3835
3836 if (skip_past_comma (&str) == FAIL
3837 || fp_op2 (&str) == FAIL)
3838 {
3839 if (! inst.error)
3840 inst.error = BAD_ARGS;
3841 return;
3842 }
3843
3844 inst.instruction |= flags;
3845 end_of_line (str);
3846 return;
3847 }
3848
3849 static void
3850 do_fp_from_reg (str, flags)
3851 char * str;
3852 unsigned long flags;
3853 {
3854 skip_whitespace (str);
3855
3856 switch (inst.suffix)
3857 {
3858 case SUFF_S:
3859 break;
3860 case SUFF_D:
3861 inst.instruction |= 0x00000080;
3862 break;
3863 case SUFF_E:
3864 inst.instruction |= 0x00080000;
3865 break;
3866 default:
3867 abort ();
3868 }
3869
3870 if (fp_reg_required_here (&str, 16) == FAIL)
3871 {
3872 if (! inst.error)
3873 inst.error = BAD_ARGS;
3874 return;
3875 }
3876
3877 if (skip_past_comma (&str) == FAIL
3878 || reg_required_here (&str, 12) == FAIL)
3879 {
3880 if (! inst.error)
3881 inst.error = BAD_ARGS;
3882 return;
3883 }
3884
3885 inst.instruction |= flags;
3886 end_of_line (str);
3887 return;
3888 }
3889
3890 static void
3891 do_fp_to_reg (str, flags)
3892 char * str;
3893 unsigned long flags;
3894 {
3895 skip_whitespace (str);
3896
3897 if (reg_required_here (&str, 12) == FAIL)
3898 return;
3899
3900 if (skip_past_comma (&str) == FAIL
3901 || fp_reg_required_here (&str, 0) == FAIL)
3902 {
3903 if (! inst.error)
3904 inst.error = BAD_ARGS;
3905 return;
3906 }
3907
3908 inst.instruction |= flags;
3909 end_of_line (str);
3910 return;
3911 }
3912
3913 /* Thumb specific routines */
3914
3915 /* Parse and validate that a register is of the right form, this saves
3916 repeated checking of this information in many similar cases.
3917 Unlike the 32-bit case we do not insert the register into the opcode
3918 here, since the position is often unknown until the full instruction
3919 has been parsed. */
3920 static int
3921 thumb_reg (strp, hi_lo)
3922 char ** strp;
3923 int hi_lo;
3924 {
3925 int reg;
3926
3927 if ((reg = reg_required_here (strp, -1)) == FAIL)
3928 return FAIL;
3929
3930 switch (hi_lo)
3931 {
3932 case THUMB_REG_LO:
3933 if (reg > 7)
3934 {
3935 inst.error = _("lo register required");
3936 return FAIL;
3937 }
3938 break;
3939
3940 case THUMB_REG_HI:
3941 if (reg < 8)
3942 {
3943 inst.error = _("hi register required");
3944 return FAIL;
3945 }
3946 break;
3947
3948 default:
3949 break;
3950 }
3951
3952 return reg;
3953 }
3954
3955 /* Parse an add or subtract instruction, SUBTRACT is non-zero if the opcode
3956 was SUB. */
3957 static void
3958 thumb_add_sub (str, subtract)
3959 char * str;
3960 int subtract;
3961 {
3962 int Rd, Rs, Rn = FAIL;
3963
3964 skip_whitespace (str);
3965
3966 if ((Rd = thumb_reg (&str, THUMB_REG_ANY)) == FAIL
3967 || skip_past_comma (&str) == FAIL)
3968 {
3969 if (! inst.error)
3970 inst.error = BAD_ARGS;
3971 return;
3972 }
3973
3974 if (is_immediate_prefix (*str))
3975 {
3976 Rs = Rd;
3977 str++;
3978 if (my_get_expression (&inst.reloc.exp, &str))
3979 return;
3980 }
3981 else
3982 {
3983 if ((Rs = thumb_reg (&str, THUMB_REG_ANY)) == FAIL)
3984 return;
3985
3986 if (skip_past_comma (&str) == FAIL)
3987 {
3988 /* Two operand format, shuffle the registers and pretend there
3989 are 3 */
3990 Rn = Rs;
3991 Rs = Rd;
3992 }
3993 else if (is_immediate_prefix (*str))
3994 {
3995 str++;
3996 if (my_get_expression (&inst.reloc.exp, &str))
3997 return;
3998 }
3999 else if ((Rn = thumb_reg (&str, THUMB_REG_ANY)) == FAIL)
4000 return;
4001 }
4002
4003 /* We now have Rd and Rs set to registers, and Rn set to a register or FAIL;
4004 for the latter case, EXPR contains the immediate that was found. */
4005 if (Rn != FAIL)
4006 {
4007 /* All register format. */
4008 if (Rd > 7 || Rs > 7 || Rn > 7)
4009 {
4010 if (Rs != Rd)
4011 {
4012 inst.error = _("dest and source1 must be the same register");
4013 return;
4014 }
4015
4016 /* Can't do this for SUB */
4017 if (subtract)
4018 {
4019 inst.error = _("subtract valid only on lo regs");
4020 return;
4021 }
4022
4023 inst.instruction = (T_OPCODE_ADD_HI
4024 | (Rd > 7 ? THUMB_H1 : 0)
4025 | (Rn > 7 ? THUMB_H2 : 0));
4026 inst.instruction |= (Rd & 7) | ((Rn & 7) << 3);
4027 }
4028 else
4029 {
4030 inst.instruction = subtract ? T_OPCODE_SUB_R3 : T_OPCODE_ADD_R3;
4031 inst.instruction |= Rd | (Rs << 3) | (Rn << 6);
4032 }
4033 }
4034 else
4035 {
4036 /* Immediate expression, now things start to get nasty. */
4037
4038 /* First deal with HI regs, only very restricted cases allowed:
4039 Adjusting SP, and using PC or SP to get an address. */
4040 if ((Rd > 7 && (Rd != REG_SP || Rs != REG_SP))
4041 || (Rs > 7 && Rs != REG_SP && Rs != REG_PC))
4042 {
4043 inst.error = _("invalid Hi register with immediate");
4044 return;
4045 }
4046
4047 if (inst.reloc.exp.X_op != O_constant)
4048 {
4049 /* Value isn't known yet, all we can do is store all the fragments
4050 we know about in the instruction and let the reloc hacking
4051 work it all out. */
4052 inst.instruction = (subtract ? 0x8000 : 0) | (Rd << 4) | Rs;
4053 inst.reloc.type = BFD_RELOC_ARM_THUMB_ADD;
4054 }
4055 else
4056 {
4057 int offset = inst.reloc.exp.X_add_number;
4058
4059 if (subtract)
4060 offset = -offset;
4061
4062 if (offset < 0)
4063 {
4064 offset = -offset;
4065 subtract = 1;
4066
4067 /* Quick check, in case offset is MIN_INT */
4068 if (offset < 0)
4069 {
4070 inst.error = _("immediate value out of range");
4071 return;
4072 }
4073 }
4074 else
4075 subtract = 0;
4076
4077 if (Rd == REG_SP)
4078 {
4079 if (offset & ~0x1fc)
4080 {
4081 inst.error = _("invalid immediate value for stack adjust");
4082 return;
4083 }
4084 inst.instruction = subtract ? T_OPCODE_SUB_ST : T_OPCODE_ADD_ST;
4085 inst.instruction |= offset >> 2;
4086 }
4087 else if (Rs == REG_PC || Rs == REG_SP)
4088 {
4089 if (subtract
4090 || (offset & ~0x3fc))
4091 {
4092 inst.error = _("invalid immediate for address calculation");
4093 return;
4094 }
4095 inst.instruction = (Rs == REG_PC ? T_OPCODE_ADD_PC
4096 : T_OPCODE_ADD_SP);
4097 inst.instruction |= (Rd << 8) | (offset >> 2);
4098 }
4099 else if (Rs == Rd)
4100 {
4101 if (offset & ~0xff)
4102 {
4103 inst.error = _("immediate value out of range");
4104 return;
4105 }
4106 inst.instruction = subtract ? T_OPCODE_SUB_I8 : T_OPCODE_ADD_I8;
4107 inst.instruction |= (Rd << 8) | offset;
4108 }
4109 else
4110 {
4111 if (offset & ~0x7)
4112 {
4113 inst.error = _("immediate value out of range");
4114 return;
4115 }
4116 inst.instruction = subtract ? T_OPCODE_SUB_I3 : T_OPCODE_ADD_I3;
4117 inst.instruction |= Rd | (Rs << 3) | (offset << 6);
4118 }
4119 }
4120 }
4121
4122 end_of_line (str);
4123 }
4124
4125 static void
4126 thumb_shift (str, shift)
4127 char * str;
4128 int shift;
4129 {
4130 int Rd, Rs, Rn = FAIL;
4131
4132 skip_whitespace (str);
4133
4134 if ((Rd = thumb_reg (&str, THUMB_REG_LO)) == FAIL
4135 || skip_past_comma (&str) == FAIL)
4136 {
4137 if (! inst.error)
4138 inst.error = BAD_ARGS;
4139 return;
4140 }
4141
4142 if (is_immediate_prefix (*str))
4143 {
4144 /* Two operand immediate format, set Rs to Rd. */
4145 Rs = Rd;
4146 str ++;
4147 if (my_get_expression (&inst.reloc.exp, &str))
4148 return;
4149 }
4150 else
4151 {
4152 if ((Rs = thumb_reg (&str, THUMB_REG_LO)) == FAIL)
4153 return;
4154
4155 if (skip_past_comma (&str) == FAIL)
4156 {
4157 /* Two operand format, shuffle the registers and pretend there
4158 are 3 */
4159 Rn = Rs;
4160 Rs = Rd;
4161 }
4162 else if (is_immediate_prefix (*str))
4163 {
4164 str++;
4165 if (my_get_expression (&inst.reloc.exp, &str))
4166 return;
4167 }
4168 else if ((Rn = thumb_reg (&str, THUMB_REG_LO)) == FAIL)
4169 return;
4170 }
4171
4172 /* We now have Rd and Rs set to registers, and Rn set to a register or FAIL;
4173 for the latter case, EXPR contains the immediate that was found. */
4174
4175 if (Rn != FAIL)
4176 {
4177 if (Rs != Rd)
4178 {
4179 inst.error = _("source1 and dest must be same register");
4180 return;
4181 }
4182
4183 switch (shift)
4184 {
4185 case THUMB_ASR: inst.instruction = T_OPCODE_ASR_R; break;
4186 case THUMB_LSL: inst.instruction = T_OPCODE_LSL_R; break;
4187 case THUMB_LSR: inst.instruction = T_OPCODE_LSR_R; break;
4188 }
4189
4190 inst.instruction |= Rd | (Rn << 3);
4191 }
4192 else
4193 {
4194 switch (shift)
4195 {
4196 case THUMB_ASR: inst.instruction = T_OPCODE_ASR_I; break;
4197 case THUMB_LSL: inst.instruction = T_OPCODE_LSL_I; break;
4198 case THUMB_LSR: inst.instruction = T_OPCODE_LSR_I; break;
4199 }
4200
4201 if (inst.reloc.exp.X_op != O_constant)
4202 {
4203 /* Value isn't known yet, create a dummy reloc and let reloc
4204 hacking fix it up */
4205
4206 inst.reloc.type = BFD_RELOC_ARM_THUMB_SHIFT;
4207 }
4208 else
4209 {
4210 unsigned shift_value = inst.reloc.exp.X_add_number;
4211
4212 if (shift_value > 32 || (shift_value == 32 && shift == THUMB_LSL))
4213 {
4214 inst.error = _("Invalid immediate for shift");
4215 return;
4216 }
4217
4218 /* Shifts of zero are handled by converting to LSL */
4219 if (shift_value == 0)
4220 inst.instruction = T_OPCODE_LSL_I;
4221
4222 /* Shifts of 32 are encoded as a shift of zero */
4223 if (shift_value == 32)
4224 shift_value = 0;
4225
4226 inst.instruction |= shift_value << 6;
4227 }
4228
4229 inst.instruction |= Rd | (Rs << 3);
4230 }
4231
4232 end_of_line (str);
4233 }
4234
4235 static void
4236 thumb_mov_compare (str, move)
4237 char * str;
4238 int move;
4239 {
4240 int Rd, Rs = FAIL;
4241
4242 skip_whitespace (str);
4243
4244 if ((Rd = thumb_reg (&str, THUMB_REG_ANY)) == FAIL
4245 || skip_past_comma (&str) == FAIL)
4246 {
4247 if (! inst.error)
4248 inst.error = BAD_ARGS;
4249 return;
4250 }
4251
4252 if (is_immediate_prefix (*str))
4253 {
4254 str++;
4255 if (my_get_expression (&inst.reloc.exp, &str))
4256 return;
4257 }
4258 else if ((Rs = thumb_reg (&str, THUMB_REG_ANY)) == FAIL)
4259 return;
4260
4261 if (Rs != FAIL)
4262 {
4263 if (Rs < 8 && Rd < 8)
4264 {
4265 if (move == THUMB_MOVE)
4266 /* A move of two lowregs is encoded as ADD Rd, Rs, #0
4267 since a MOV instruction produces unpredictable results */
4268 inst.instruction = T_OPCODE_ADD_I3;
4269 else
4270 inst.instruction = T_OPCODE_CMP_LR;
4271 inst.instruction |= Rd | (Rs << 3);
4272 }
4273 else
4274 {
4275 if (move == THUMB_MOVE)
4276 inst.instruction = T_OPCODE_MOV_HR;
4277 else
4278 inst.instruction = T_OPCODE_CMP_HR;
4279
4280 if (Rd > 7)
4281 inst.instruction |= THUMB_H1;
4282
4283 if (Rs > 7)
4284 inst.instruction |= THUMB_H2;
4285
4286 inst.instruction |= (Rd & 7) | ((Rs & 7) << 3);
4287 }
4288 }
4289 else
4290 {
4291 if (Rd > 7)
4292 {
4293 inst.error = _("only lo regs allowed with immediate");
4294 return;
4295 }
4296
4297 if (move == THUMB_MOVE)
4298 inst.instruction = T_OPCODE_MOV_I8;
4299 else
4300 inst.instruction = T_OPCODE_CMP_I8;
4301
4302 inst.instruction |= Rd << 8;
4303
4304 if (inst.reloc.exp.X_op != O_constant)
4305 inst.reloc.type = BFD_RELOC_ARM_THUMB_IMM;
4306 else
4307 {
4308 unsigned value = inst.reloc.exp.X_add_number;
4309
4310 if (value > 255)
4311 {
4312 inst.error = _("invalid immediate");
4313 return;
4314 }
4315
4316 inst.instruction |= value;
4317 }
4318 }
4319
4320 end_of_line (str);
4321 }
4322
4323 static void
4324 thumb_load_store (str, load_store, size)
4325 char * str;
4326 int load_store;
4327 int size;
4328 {
4329 int Rd, Rb, Ro = FAIL;
4330
4331 skip_whitespace (str);
4332
4333 if ((Rd = thumb_reg (&str, THUMB_REG_LO)) == FAIL
4334 || skip_past_comma (&str) == FAIL)
4335 {
4336 if (! inst.error)
4337 inst.error = BAD_ARGS;
4338 return;
4339 }
4340
4341 if (*str == '[')
4342 {
4343 str++;
4344 if ((Rb = thumb_reg (&str, THUMB_REG_ANY)) == FAIL)
4345 return;
4346
4347 if (skip_past_comma (&str) != FAIL)
4348 {
4349 if (is_immediate_prefix (*str))
4350 {
4351 str++;
4352 if (my_get_expression (&inst.reloc.exp, &str))
4353 return;
4354 }
4355 else if ((Ro = thumb_reg (&str, THUMB_REG_LO)) == FAIL)
4356 return;
4357 }
4358 else
4359 {
4360 inst.reloc.exp.X_op = O_constant;
4361 inst.reloc.exp.X_add_number = 0;
4362 }
4363
4364 if (*str != ']')
4365 {
4366 inst.error = _("expected ']'");
4367 return;
4368 }
4369 str++;
4370 }
4371 else if (*str == '=')
4372 {
4373 /* Parse an "ldr Rd, =expr" instruction; this is another pseudo op */
4374 str++;
4375
4376 skip_whitespace (str);
4377
4378 if (my_get_expression (& inst.reloc.exp, & str))
4379 return;
4380
4381 end_of_line (str);
4382
4383 if ( inst.reloc.exp.X_op != O_constant
4384 && inst.reloc.exp.X_op != O_symbol)
4385 {
4386 inst.error = "Constant expression expected";
4387 return;
4388 }
4389
4390 if (inst.reloc.exp.X_op == O_constant
4391 && ((inst.reloc.exp.X_add_number & ~0xFF) == 0))
4392 {
4393 /* This can be done with a mov instruction */
4394
4395 inst.instruction = T_OPCODE_MOV_I8 | (Rd << 8);
4396 inst.instruction |= inst.reloc.exp.X_add_number;
4397 return;
4398 }
4399
4400 /* Insert into literal pool */
4401 if (add_to_lit_pool () == FAIL)
4402 {
4403 if (!inst.error)
4404 inst.error = "literal pool insertion failed";
4405 return;
4406 }
4407
4408 inst.reloc.type = BFD_RELOC_ARM_THUMB_OFFSET;
4409 inst.reloc.pc_rel = 1;
4410 inst.instruction = T_OPCODE_LDR_PC | (Rd << 8);
4411 inst.reloc.exp.X_add_number += 4; /* Adjust ARM pipeline offset to Thumb */
4412
4413 return;
4414 }
4415 else
4416 {
4417 if (my_get_expression (&inst.reloc.exp, &str))
4418 return;
4419
4420 inst.instruction = T_OPCODE_LDR_PC | (Rd << 8);
4421 inst.reloc.pc_rel = 1;
4422 inst.reloc.exp.X_add_number -= 4; /* Pipeline offset */
4423 inst.reloc.type = BFD_RELOC_ARM_THUMB_OFFSET;
4424 end_of_line (str);
4425 return;
4426 }
4427
4428 if (Rb == REG_PC || Rb == REG_SP)
4429 {
4430 if (size != THUMB_WORD)
4431 {
4432 inst.error = _("byte or halfword not valid for base register");
4433 return;
4434 }
4435 else if (Rb == REG_PC && load_store != THUMB_LOAD)
4436 {
4437 inst.error = _("R15 based store not allowed");
4438 return;
4439 }
4440 else if (Ro != FAIL)
4441 {
4442 inst.error = _("Invalid base register for register offset");
4443 return;
4444 }
4445
4446 if (Rb == REG_PC)
4447 inst.instruction = T_OPCODE_LDR_PC;
4448 else if (load_store == THUMB_LOAD)
4449 inst.instruction = T_OPCODE_LDR_SP;
4450 else
4451 inst.instruction = T_OPCODE_STR_SP;
4452
4453 inst.instruction |= Rd << 8;
4454 if (inst.reloc.exp.X_op == O_constant)
4455 {
4456 unsigned offset = inst.reloc.exp.X_add_number;
4457
4458 if (offset & ~0x3fc)
4459 {
4460 inst.error = _("invalid offset");
4461 return;
4462 }
4463
4464 inst.instruction |= offset >> 2;
4465 }
4466 else
4467 inst.reloc.type = BFD_RELOC_ARM_THUMB_OFFSET;
4468 }
4469 else if (Rb > 7)
4470 {
4471 inst.error = _("invalid base register in load/store");
4472 return;
4473 }
4474 else if (Ro == FAIL)
4475 {
4476 /* Immediate offset */
4477 if (size == THUMB_WORD)
4478 inst.instruction = (load_store == THUMB_LOAD
4479 ? T_OPCODE_LDR_IW : T_OPCODE_STR_IW);
4480 else if (size == THUMB_HALFWORD)
4481 inst.instruction = (load_store == THUMB_LOAD
4482 ? T_OPCODE_LDR_IH : T_OPCODE_STR_IH);
4483 else
4484 inst.instruction = (load_store == THUMB_LOAD
4485 ? T_OPCODE_LDR_IB : T_OPCODE_STR_IB);
4486
4487 inst.instruction |= Rd | (Rb << 3);
4488
4489 if (inst.reloc.exp.X_op == O_constant)
4490 {
4491 unsigned offset = inst.reloc.exp.X_add_number;
4492
4493 if (offset & ~(0x1f << size))
4494 {
4495 inst.error = _("Invalid offset");
4496 return;
4497 }
4498 inst.instruction |= (offset >> size) << 6;
4499 }
4500 else
4501 inst.reloc.type = BFD_RELOC_ARM_THUMB_OFFSET;
4502 }
4503 else
4504 {
4505 /* Register offset */
4506 if (size == THUMB_WORD)
4507 inst.instruction = (load_store == THUMB_LOAD
4508 ? T_OPCODE_LDR_RW : T_OPCODE_STR_RW);
4509 else if (size == THUMB_HALFWORD)
4510 inst.instruction = (load_store == THUMB_LOAD
4511 ? T_OPCODE_LDR_RH : T_OPCODE_STR_RH);
4512 else
4513 inst.instruction = (load_store == THUMB_LOAD
4514 ? T_OPCODE_LDR_RB : T_OPCODE_STR_RB);
4515
4516 inst.instruction |= Rd | (Rb << 3) | (Ro << 6);
4517 }
4518
4519 end_of_line (str);
4520 }
4521
4522 static void
4523 do_t_nop (str)
4524 char * str;
4525 {
4526 /* Do nothing */
4527 end_of_line (str);
4528 return;
4529 }
4530
4531 /* Handle the Format 4 instructions that do not have equivalents in other
4532 formats. That is, ADC, AND, EOR, SBC, ROR, TST, NEG, CMN, ORR, MUL,
4533 BIC and MVN. */
4534 static void
4535 do_t_arit (str)
4536 char * str;
4537 {
4538 int Rd, Rs, Rn;
4539
4540 skip_whitespace (str);
4541
4542 if ((Rd = thumb_reg (&str, THUMB_REG_LO)) == FAIL
4543 || skip_past_comma (&str) == FAIL
4544 || (Rs = thumb_reg (&str, THUMB_REG_LO)) == FAIL)
4545 {
4546 inst.error = BAD_ARGS;
4547 return;
4548 }
4549
4550 if (skip_past_comma (&str) != FAIL)
4551 {
4552 /* Three operand format not allowed for TST, CMN, NEG and MVN.
4553 (It isn't allowed for CMP either, but that isn't handled by this
4554 function.) */
4555 if (inst.instruction == T_OPCODE_TST
4556 || inst.instruction == T_OPCODE_CMN
4557 || inst.instruction == T_OPCODE_NEG
4558 || inst.instruction == T_OPCODE_MVN)
4559 {
4560 inst.error = BAD_ARGS;
4561 return;
4562 }
4563
4564 if ((Rn = thumb_reg (&str, THUMB_REG_LO)) == FAIL)
4565 return;
4566
4567 if (Rs != Rd)
4568 {
4569 inst.error = _("dest and source1 one must be the same register");
4570 return;
4571 }
4572 Rs = Rn;
4573 }
4574
4575 if (inst.instruction == T_OPCODE_MUL
4576 && Rs == Rd)
4577 as_tsktsk (_("Rs and Rd must be different in MUL"));
4578
4579 inst.instruction |= Rd | (Rs << 3);
4580 end_of_line (str);
4581 }
4582
4583 static void
4584 do_t_add (str)
4585 char * str;
4586 {
4587 thumb_add_sub (str, 0);
4588 }
4589
4590 static void
4591 do_t_asr (str)
4592 char * str;
4593 {
4594 thumb_shift (str, THUMB_ASR);
4595 }
4596
4597 static void
4598 do_t_branch9 (str)
4599 char * str;
4600 {
4601 if (my_get_expression (&inst.reloc.exp, &str))
4602 return;
4603 inst.reloc.type = BFD_RELOC_THUMB_PCREL_BRANCH9;
4604 inst.reloc.pc_rel = 1;
4605 end_of_line (str);
4606 }
4607
4608 static void
4609 do_t_branch12 (str)
4610 char * str;
4611 {
4612 if (my_get_expression (&inst.reloc.exp, &str))
4613 return;
4614 inst.reloc.type = BFD_RELOC_THUMB_PCREL_BRANCH12;
4615 inst.reloc.pc_rel = 1;
4616 end_of_line (str);
4617 }
4618
4619 /* Find the real, Thumb encoded start of a Thumb function. */
4620
4621 static symbolS *
4622 find_real_start (symbolP)
4623 symbolS * symbolP;
4624 {
4625 char * real_start;
4626 const char * name = S_GET_NAME (symbolP);
4627 symbolS * new_target;
4628
4629 /* This definiton must agree with the one in gcc/config/arm/thumb.c */
4630 #define STUB_NAME ".real_start_of"
4631
4632 if (name == NULL)
4633 abort();
4634
4635 /* Names that start with '.' are local labels, not function entry points.
4636 The compiler may generate BL instructions to these labels because it
4637 needs to perform a branch to a far away location. */
4638 if (name[0] == '.')
4639 return symbolP;
4640
4641 real_start = malloc (strlen (name) + strlen (STUB_NAME) + 1);
4642 sprintf (real_start, "%s%s", STUB_NAME, name);
4643
4644 new_target = symbol_find (real_start);
4645
4646 if (new_target == NULL)
4647 {
4648 as_warn ("Failed to find real start of function: %s\n", name);
4649 new_target = symbolP;
4650 }
4651
4652 free (real_start);
4653
4654 return new_target;
4655 }
4656
4657
4658 static void
4659 do_t_branch23 (str)
4660 char * str;
4661 {
4662 if (my_get_expression (& inst.reloc.exp, & str))
4663 return;
4664
4665 inst.reloc.type = BFD_RELOC_THUMB_PCREL_BRANCH23;
4666 inst.reloc.pc_rel = 1;
4667 end_of_line (str);
4668
4669 /* If the destination of the branch is a defined symbol which does not have
4670 the THUMB_FUNC attribute, then we must be calling a function which has
4671 the (interfacearm) attribute. We look for the Thumb entry point to that
4672 function and change the branch to refer to that function instead. */
4673 if ( inst.reloc.exp.X_op == O_symbol
4674 && inst.reloc.exp.X_add_symbol != NULL
4675 && S_IS_DEFINED (inst.reloc.exp.X_add_symbol)
4676 && ! THUMB_IS_FUNC (inst.reloc.exp.X_add_symbol))
4677 inst.reloc.exp.X_add_symbol = find_real_start (inst.reloc.exp.X_add_symbol);
4678 }
4679
4680 static void
4681 do_t_bx (str)
4682 char * str;
4683 {
4684 int reg;
4685
4686 skip_whitespace (str);
4687
4688 if ((reg = thumb_reg (&str, THUMB_REG_ANY)) == FAIL)
4689 return;
4690
4691 /* This sets THUMB_H2 from the top bit of reg. */
4692 inst.instruction |= reg << 3;
4693
4694 /* ??? FIXME: Should add a hacky reloc here if reg is REG_PC. The reloc
4695 should cause the alignment to be checked once it is known. This is
4696 because BX PC only works if the instruction is word aligned. */
4697
4698 end_of_line (str);
4699 }
4700
4701 static void
4702 do_t_compare (str)
4703 char * str;
4704 {
4705 thumb_mov_compare (str, THUMB_COMPARE);
4706 }
4707
4708 static void
4709 do_t_ldmstm (str)
4710 char * str;
4711 {
4712 int Rb;
4713 long range;
4714
4715 skip_whitespace (str);
4716
4717 if ((Rb = thumb_reg (&str, THUMB_REG_LO)) == FAIL)
4718 return;
4719
4720 if (*str != '!')
4721 as_warn (_("Inserted missing '!': load/store multiple always writes back base register"));
4722 else
4723 str++;
4724
4725 if (skip_past_comma (&str) == FAIL
4726 || (range = reg_list (&str)) == FAIL)
4727 {
4728 if (! inst.error)
4729 inst.error = BAD_ARGS;
4730 return;
4731 }
4732
4733 if (inst.reloc.type != BFD_RELOC_NONE)
4734 {
4735 /* This really doesn't seem worth it. */
4736 inst.reloc.type = BFD_RELOC_NONE;
4737 inst.error = _("Expression too complex");
4738 return;
4739 }
4740
4741 if (range & ~0xff)
4742 {
4743 inst.error = _("only lo-regs valid in load/store multiple");
4744 return;
4745 }
4746
4747 inst.instruction |= (Rb << 8) | range;
4748 end_of_line (str);
4749 }
4750
4751 static void
4752 do_t_ldr (str)
4753 char * str;
4754 {
4755 thumb_load_store (str, THUMB_LOAD, THUMB_WORD);
4756 }
4757
4758 static void
4759 do_t_ldrb (str)
4760 char * str;
4761 {
4762 thumb_load_store (str, THUMB_LOAD, THUMB_BYTE);
4763 }
4764
4765 static void
4766 do_t_ldrh (str)
4767 char * str;
4768 {
4769 thumb_load_store (str, THUMB_LOAD, THUMB_HALFWORD);
4770 }
4771
4772 static void
4773 do_t_lds (str)
4774 char * str;
4775 {
4776 int Rd, Rb, Ro;
4777
4778 skip_whitespace (str);
4779
4780 if ((Rd = thumb_reg (&str, THUMB_REG_LO)) == FAIL
4781 || skip_past_comma (&str) == FAIL
4782 || *str++ != '['
4783 || (Rb = thumb_reg (&str, THUMB_REG_LO)) == FAIL
4784 || skip_past_comma (&str) == FAIL
4785 || (Ro = thumb_reg (&str, THUMB_REG_LO)) == FAIL
4786 || *str++ != ']')
4787 {
4788 if (! inst.error)
4789 inst.error = _("Syntax: ldrs[b] Rd, [Rb, Ro]");
4790 return;
4791 }
4792
4793 inst.instruction |= Rd | (Rb << 3) | (Ro << 6);
4794 end_of_line (str);
4795 }
4796
4797 static void
4798 do_t_lsl (str)
4799 char * str;
4800 {
4801 thumb_shift (str, THUMB_LSL);
4802 }
4803
4804 static void
4805 do_t_lsr (str)
4806 char * str;
4807 {
4808 thumb_shift (str, THUMB_LSR);
4809 }
4810
4811 static void
4812 do_t_mov (str)
4813 char * str;
4814 {
4815 thumb_mov_compare (str, THUMB_MOVE);
4816 }
4817
4818 static void
4819 do_t_push_pop (str)
4820 char * str;
4821 {
4822 long range;
4823
4824 skip_whitespace (str);
4825
4826 if ((range = reg_list (&str)) == FAIL)
4827 {
4828 if (! inst.error)
4829 inst.error = BAD_ARGS;
4830 return;
4831 }
4832
4833 if (inst.reloc.type != BFD_RELOC_NONE)
4834 {
4835 /* This really doesn't seem worth it. */
4836 inst.reloc.type = BFD_RELOC_NONE;
4837 inst.error = _("Expression too complex");
4838 return;
4839 }
4840
4841 if (range & ~0xff)
4842 {
4843 if ((inst.instruction == T_OPCODE_PUSH
4844 && (range & ~0xff) == 1 << REG_LR)
4845 || (inst.instruction == T_OPCODE_POP
4846 && (range & ~0xff) == 1 << REG_PC))
4847 {
4848 inst.instruction |= THUMB_PP_PC_LR;
4849 range &= 0xff;
4850 }
4851 else
4852 {
4853 inst.error = _("invalid register list to push/pop instruction");
4854 return;
4855 }
4856 }
4857
4858 inst.instruction |= range;
4859 end_of_line (str);
4860 }
4861
4862 static void
4863 do_t_str (str)
4864 char * str;
4865 {
4866 thumb_load_store (str, THUMB_STORE, THUMB_WORD);
4867 }
4868
4869 static void
4870 do_t_strb (str)
4871 char * str;
4872 {
4873 thumb_load_store (str, THUMB_STORE, THUMB_BYTE);
4874 }
4875
4876 static void
4877 do_t_strh (str)
4878 char * str;
4879 {
4880 thumb_load_store (str, THUMB_STORE, THUMB_HALFWORD);
4881 }
4882
4883 static void
4884 do_t_sub (str)
4885 char * str;
4886 {
4887 thumb_add_sub (str, 1);
4888 }
4889
4890 static void
4891 do_t_swi (str)
4892 char * str;
4893 {
4894 skip_whitespace (str);
4895
4896 if (my_get_expression (&inst.reloc.exp, &str))
4897 return;
4898
4899 inst.reloc.type = BFD_RELOC_ARM_SWI;
4900 end_of_line (str);
4901 return;
4902 }
4903
4904 static void
4905 do_t_adr (str)
4906 char * str;
4907 {
4908 /* This is a pseudo-op of the form "adr rd, label" to be converted
4909 into a relative address of the form "add rd, pc, #label-.-4" */
4910 skip_whitespace (str);
4911
4912 if (reg_required_here (&str, 4) == FAIL /* Store Rd in temporary location inside instruction. */
4913 || skip_past_comma (&str) == FAIL
4914 || my_get_expression (&inst.reloc.exp, &str))
4915 {
4916 if (!inst.error)
4917 inst.error = BAD_ARGS;
4918 return;
4919 }
4920
4921 inst.reloc.type = BFD_RELOC_ARM_THUMB_ADD;
4922 inst.reloc.exp.X_add_number -= 4; /* PC relative adjust */
4923 inst.reloc.pc_rel = 1;
4924 inst.instruction |= REG_PC; /* Rd is already placed into the instruction */
4925 end_of_line (str);
4926 }
4927
4928 static void
4929 insert_reg (entry)
4930 int entry;
4931 {
4932 int len = strlen (reg_table[entry].name) + 2;
4933 char * buf = (char *) xmalloc (len);
4934 char * buf2 = (char *) xmalloc (len);
4935 int i = 0;
4936
4937 #ifdef REGISTER_PREFIX
4938 buf[i++] = REGISTER_PREFIX;
4939 #endif
4940
4941 strcpy (buf + i, reg_table[entry].name);
4942
4943 for (i = 0; buf[i]; i++)
4944 buf2[i] = islower (buf[i]) ? toupper (buf[i]) : buf[i];
4945
4946 buf2[i] = '\0';
4947
4948 hash_insert (arm_reg_hsh, buf, (PTR) &reg_table[entry]);
4949 hash_insert (arm_reg_hsh, buf2, (PTR) &reg_table[entry]);
4950 }
4951
4952 static void
4953 insert_reg_alias (str, regnum)
4954 char *str;
4955 int regnum;
4956 {
4957 struct reg_entry *new =
4958 (struct reg_entry *)xmalloc (sizeof (struct reg_entry));
4959 char *name = xmalloc (strlen (str) + 1);
4960 strcpy (name, str);
4961
4962 new->name = name;
4963 new->number = regnum;
4964
4965 hash_insert (arm_reg_hsh, name, (PTR) new);
4966 }
4967
4968 static void
4969 set_constant_flonums ()
4970 {
4971 int i;
4972
4973 for (i = 0; i < NUM_FLOAT_VALS; i++)
4974 if (atof_ieee ((char *)fp_const[i], 'x', fp_values[i]) == NULL)
4975 abort ();
4976 }
4977
4978 void
4979 md_begin ()
4980 {
4981 unsigned mach;
4982 unsigned int i;
4983
4984 if ( (arm_ops_hsh = hash_new ()) == NULL
4985 || (arm_tops_hsh = hash_new ()) == NULL
4986 || (arm_cond_hsh = hash_new ()) == NULL
4987 || (arm_shift_hsh = hash_new ()) == NULL
4988 || (arm_reg_hsh = hash_new ()) == NULL
4989 || (arm_psr_hsh = hash_new ()) == NULL)
4990 as_fatal (_("Virtual memory exhausted"));
4991
4992 for (i = 0; i < sizeof (insns) / sizeof (struct asm_opcode); i++)
4993 hash_insert (arm_ops_hsh, insns[i].template, (PTR) (insns + i));
4994 for (i = 0; i < sizeof (tinsns) / sizeof (struct thumb_opcode); i++)
4995 hash_insert (arm_tops_hsh, tinsns[i].template, (PTR) (tinsns + i));
4996 for (i = 0; i < sizeof (conds) / sizeof (struct asm_cond); i++)
4997 hash_insert (arm_cond_hsh, conds[i].template, (PTR) (conds + i));
4998 for (i = 0; i < sizeof (shift) / sizeof (struct asm_shift); i++)
4999 hash_insert (arm_shift_hsh, shift[i].template, (PTR) (shift + i));
5000 for (i = 0; i < sizeof (psrs) / sizeof (struct asm_psr); i++)
5001 hash_insert (arm_psr_hsh, psrs[i].template, (PTR) (psrs + i));
5002
5003 for (i = 0; reg_table[i].name; i++)
5004 insert_reg (i);
5005
5006 set_constant_flonums ();
5007
5008 #if defined OBJ_COFF || defined OBJ_ELF
5009 {
5010 unsigned int flags = 0;
5011
5012 /* Set the flags in the private structure. */
5013 if (uses_apcs_26) flags |= F_APCS26;
5014 if (support_interwork) flags |= F_INTERWORK;
5015 if (uses_apcs_float) flags |= F_APCS_FLOAT;
5016 if (pic_code) flags |= F_PIC;
5017 if ((cpu_variant & FPU_ALL) == FPU_NONE) flags |= F_SOFT_FLOAT;
5018
5019 bfd_set_private_flags (stdoutput, flags);
5020 }
5021 #endif
5022
5023 /* Record the CPU type as well. */
5024 switch (cpu_variant & ARM_CPU_MASK)
5025 {
5026 case ARM_2:
5027 mach = bfd_mach_arm_2;
5028 break;
5029
5030 case ARM_3: /* Also ARM_250. */
5031 mach = bfd_mach_arm_2a;
5032 break;
5033
5034 default:
5035 case ARM_6 | ARM_3 | ARM_2: /* Actually no CPU type defined. */
5036 mach = bfd_mach_arm_4;
5037 break;
5038
5039 case ARM_7: /* Also ARM_6. */
5040 mach = bfd_mach_arm_3;
5041 break;
5042 }
5043
5044 /* Catch special cases. */
5045 if (cpu_variant != (FPU_DEFAULT | CPU_DEFAULT))
5046 {
5047 if (cpu_variant & (ARM_EXT_V5 & ARM_THUMB))
5048 mach = bfd_mach_arm_5T;
5049 else if (cpu_variant & ARM_EXT_V5)
5050 mach = bfd_mach_arm_5;
5051 else if (cpu_variant & ARM_THUMB)
5052 mach = bfd_mach_arm_4T;
5053 else if ((cpu_variant & ARM_ARCH_V4) == ARM_ARCH_V4)
5054 mach = bfd_mach_arm_4;
5055 else if (cpu_variant & ARM_LONGMUL)
5056 mach = bfd_mach_arm_3M;
5057 }
5058
5059 bfd_set_arch_mach (stdoutput, TARGET_ARCH, mach);
5060 }
5061
5062 /* Turn an integer of n bytes (in val) into a stream of bytes appropriate
5063 for use in the a.out file, and stores them in the array pointed to by buf.
5064 This knows about the endian-ness of the target machine and does
5065 THE RIGHT THING, whatever it is. Possible values for n are 1 (byte)
5066 2 (short) and 4 (long) Floating numbers are put out as a series of
5067 LITTLENUMS (shorts, here at least). */
5068 void
5069 md_number_to_chars (buf, val, n)
5070 char * buf;
5071 valueT val;
5072 int n;
5073 {
5074 if (target_big_endian)
5075 number_to_chars_bigendian (buf, val, n);
5076 else
5077 number_to_chars_littleendian (buf, val, n);
5078 }
5079
5080 static valueT
5081 md_chars_to_number (buf, n)
5082 char * buf;
5083 int n;
5084 {
5085 valueT result = 0;
5086 unsigned char * where = (unsigned char *) buf;
5087
5088 if (target_big_endian)
5089 {
5090 while (n--)
5091 {
5092 result <<= 8;
5093 result |= (*where++ & 255);
5094 }
5095 }
5096 else
5097 {
5098 while (n--)
5099 {
5100 result <<= 8;
5101 result |= (where[n] & 255);
5102 }
5103 }
5104
5105 return result;
5106 }
5107
5108 /* Turn a string in input_line_pointer into a floating point constant
5109 of type TYPE, and store the appropriate bytes in *litP. The number
5110 of LITTLENUMS emitted is stored in *sizeP . An error message is
5111 returned, or NULL on OK.
5112
5113 Note that fp constants aren't represent in the normal way on the ARM.
5114 In big endian mode, things are as expected. However, in little endian
5115 mode fp constants are big-endian word-wise, and little-endian byte-wise
5116 within the words. For example, (double) 1.1 in big endian mode is
5117 the byte sequence 3f f1 99 99 99 99 99 9a, and in little endian mode is
5118 the byte sequence 99 99 f1 3f 9a 99 99 99.
5119
5120 ??? The format of 12 byte floats is uncertain according to gcc's arm.h. */
5121
5122 char *
5123 md_atof (type, litP, sizeP)
5124 char type;
5125 char * litP;
5126 int * sizeP;
5127 {
5128 int prec;
5129 LITTLENUM_TYPE words[MAX_LITTLENUMS];
5130 char *t;
5131 int i;
5132
5133 switch (type)
5134 {
5135 case 'f':
5136 case 'F':
5137 case 's':
5138 case 'S':
5139 prec = 2;
5140 break;
5141
5142 case 'd':
5143 case 'D':
5144 case 'r':
5145 case 'R':
5146 prec = 4;
5147 break;
5148
5149 case 'x':
5150 case 'X':
5151 prec = 6;
5152 break;
5153
5154 case 'p':
5155 case 'P':
5156 prec = 6;
5157 break;
5158
5159 default:
5160 *sizeP = 0;
5161 return _("Bad call to MD_ATOF()");
5162 }
5163
5164 t = atof_ieee (input_line_pointer, type, words);
5165 if (t)
5166 input_line_pointer = t;
5167 *sizeP = prec * 2;
5168
5169 if (target_big_endian)
5170 {
5171 for (i = 0; i < prec; i++)
5172 {
5173 md_number_to_chars (litP, (valueT) words[i], 2);
5174 litP += 2;
5175 }
5176 }
5177 else
5178 {
5179 /* For a 4 byte float the order of elements in `words' is 1 0. For an
5180 8 byte float the order is 1 0 3 2. */
5181 for (i = 0; i < prec; i += 2)
5182 {
5183 md_number_to_chars (litP, (valueT) words[i + 1], 2);
5184 md_number_to_chars (litP + 2, (valueT) words[i], 2);
5185 litP += 4;
5186 }
5187 }
5188
5189 return 0;
5190 }
5191
5192 /* The knowledge of the PC's pipeline offset is built into the insns themselves. */
5193 long
5194 md_pcrel_from (fixP)
5195 fixS * fixP;
5196 {
5197 if ( fixP->fx_addsy
5198 && S_GET_SEGMENT (fixP->fx_addsy) == undefined_section
5199 && fixP->fx_subsy == NULL)
5200 return 0;
5201
5202 if (fixP->fx_pcrel && (fixP->fx_r_type == BFD_RELOC_ARM_THUMB_ADD))
5203 {
5204 /* PC relative addressing on the Thumb is slightly odd
5205 as the bottom two bits of the PC are forced to zero
5206 for the calculation. */
5207 return (fixP->fx_where + fixP->fx_frag->fr_address) & ~3;
5208 }
5209
5210 #ifdef TE_WINCE
5211 /* The pattern was adjusted to accomodate CE's off-by-one fixups,
5212 so we un-adjust here to compensate for the accomodation. */
5213 return fixP->fx_where + fixP->fx_frag->fr_address + 8;
5214 #else
5215 return fixP->fx_where + fixP->fx_frag->fr_address;
5216 #endif
5217 }
5218
5219 /* Round up a section size to the appropriate boundary. */
5220 valueT
5221 md_section_align (segment, size)
5222 segT segment ATTRIBUTE_UNUSED;
5223 valueT size;
5224 {
5225 #ifdef OBJ_ELF
5226 return size;
5227 #else
5228 /* Round all sects to multiple of 4 */
5229 return (size + 3) & ~3;
5230 #endif
5231 }
5232
5233 /* Under ELF we need to default _GLOBAL_OFFSET_TABLE. Otherwise
5234 we have no need to default values of symbols. */
5235
5236 /* ARGSUSED */
5237 symbolS *
5238 md_undefined_symbol (name)
5239 char * name;
5240 {
5241 #ifdef OBJ_ELF
5242 if (name[0] == '_' && name[1] == 'G'
5243 && streq (name, GLOBAL_OFFSET_TABLE_NAME))
5244 {
5245 if (!GOT_symbol)
5246 {
5247 if (symbol_find (name))
5248 as_bad ("GOT already in the symbol table");
5249
5250 GOT_symbol = symbol_new (name, undefined_section,
5251 (valueT)0, & zero_address_frag);
5252 }
5253
5254 return GOT_symbol;
5255 }
5256 #endif
5257
5258 return 0;
5259 }
5260
5261 /* arm_reg_parse () := if it looks like a register, return its token and
5262 advance the pointer. */
5263
5264 static int
5265 arm_reg_parse (ccp)
5266 register char ** ccp;
5267 {
5268 char * start = * ccp;
5269 char c;
5270 char * p;
5271 struct reg_entry * reg;
5272
5273 #ifdef REGISTER_PREFIX
5274 if (*start != REGISTER_PREFIX)
5275 return FAIL;
5276 p = start + 1;
5277 #else
5278 p = start;
5279 #ifdef OPTIONAL_REGISTER_PREFIX
5280 if (*p == OPTIONAL_REGISTER_PREFIX)
5281 p++, start++;
5282 #endif
5283 #endif
5284 if (!isalpha (*p) || !is_name_beginner (*p))
5285 return FAIL;
5286
5287 c = *p++;
5288 while (isalpha (c) || isdigit (c) || c == '_')
5289 c = *p++;
5290
5291 *--p = 0;
5292 reg = (struct reg_entry *) hash_find (arm_reg_hsh, start);
5293 *p = c;
5294
5295 if (reg)
5296 {
5297 *ccp = p;
5298 return reg->number;
5299 }
5300
5301 return FAIL;
5302 }
5303
5304 static int
5305 arm_psr_parse (ccp)
5306 register char ** ccp;
5307 {
5308 char * start = * ccp;
5309 char c;
5310 char * p;
5311 CONST struct asm_psr * psr;
5312
5313 p = start;
5314 c = *p++;
5315 while (isalpha (c) || c == '_')
5316 c = *p++;
5317
5318 *--p = 0;
5319 psr = (CONST struct asm_psr *) hash_find (arm_psr_hsh, start);
5320 *p = c;
5321
5322 if (psr)
5323 {
5324 *ccp = p;
5325 return psr->number;
5326 }
5327
5328 return FAIL;
5329 }
5330
5331 int
5332 md_apply_fix3 (fixP, val, seg)
5333 fixS * fixP;
5334 valueT * val;
5335 segT seg;
5336 {
5337 offsetT value = * val;
5338 offsetT newval;
5339 unsigned int newimm;
5340 unsigned long temp;
5341 int sign;
5342 char * buf = fixP->fx_where + fixP->fx_frag->fr_literal;
5343 arm_fix_data * arm_data = (arm_fix_data *) fixP->tc_fix_data;
5344
5345 assert (fixP->fx_r_type < BFD_RELOC_UNUSED);
5346
5347 /* Note whether this will delete the relocation. */
5348 #if 0 /* patch from REarnshaw to JDavis (disabled for the moment, since it doesn't work fully) */
5349 if ((fixP->fx_addsy == 0 || symbol_constant_p (fixP->fx_addsy))
5350 && !fixP->fx_pcrel)
5351 #else
5352 if (fixP->fx_addsy == 0 && !fixP->fx_pcrel)
5353 #endif
5354 fixP->fx_done = 1;
5355
5356 /* If this symbol is in a different section then we need to leave it for
5357 the linker to deal with. Unfortunately, md_pcrel_from can't tell,
5358 so we have to undo it's effects here. */
5359 if (fixP->fx_pcrel)
5360 {
5361 if (fixP->fx_addsy != NULL
5362 && S_IS_DEFINED (fixP->fx_addsy)
5363 && S_GET_SEGMENT (fixP->fx_addsy) != seg)
5364 {
5365 if (target_oabi
5366 && (fixP->fx_r_type == BFD_RELOC_ARM_PCREL_BRANCH
5367 ))
5368 value = 0;
5369 else
5370 value += md_pcrel_from (fixP);
5371 }
5372 }
5373
5374 fixP->fx_addnumber = value; /* Remember value for emit_reloc. */
5375
5376 switch (fixP->fx_r_type)
5377 {
5378 case BFD_RELOC_ARM_IMMEDIATE:
5379 newimm = validate_immediate (value);
5380 temp = md_chars_to_number (buf, INSN_SIZE);
5381
5382 /* If the instruction will fail, see if we can fix things up by
5383 changing the opcode. */
5384 if (newimm == (unsigned int) FAIL
5385 && (newimm = negate_data_op (&temp, value)) == (unsigned int) FAIL)
5386 {
5387 as_bad_where (fixP->fx_file, fixP->fx_line,
5388 _("invalid constant (%lx) after fixup"),
5389 (unsigned long) value);
5390 break;
5391 }
5392
5393 newimm |= (temp & 0xfffff000);
5394 md_number_to_chars (buf, (valueT) newimm, INSN_SIZE);
5395 break;
5396
5397 case BFD_RELOC_ARM_ADRL_IMMEDIATE:
5398 {
5399 unsigned int highpart = 0;
5400 unsigned int newinsn = 0xe1a00000; /* nop */
5401 newimm = validate_immediate (value);
5402 temp = md_chars_to_number (buf, INSN_SIZE);
5403
5404 /* If the instruction will fail, see if we can fix things up by
5405 changing the opcode. */
5406 if (newimm == (unsigned int) FAIL
5407 && (newimm = negate_data_op (& temp, value)) == (unsigned int) FAIL)
5408 {
5409 /* No ? OK - try using two ADD instructions to generate the value. */
5410 newimm = validate_immediate_twopart (value, & highpart);
5411
5412 /* Yes - then make sure that the second instruction is also an add. */
5413 if (newimm != (unsigned int) FAIL)
5414 newinsn = temp;
5415 /* Still No ? Try using a negated value. */
5416 else if (validate_immediate_twopart (- value, & highpart) != (unsigned int) FAIL)
5417 temp = newinsn = (temp & OPCODE_MASK) | OPCODE_SUB << DATA_OP_SHIFT;
5418 /* Otherwise - give up. */
5419 else
5420 {
5421 as_bad_where (fixP->fx_file, fixP->fx_line,
5422 _("Unable to compute ADRL instructions for PC offset of 0x%x"), value);
5423 break;
5424 }
5425
5426 /* Replace the first operand in the 2nd instruction (which is the PC)
5427 with the destination register. We have already added in the PC in the
5428 first instruction and we do not want to do it again. */
5429 newinsn &= ~ 0xf0000;
5430 newinsn |= ((newinsn & 0x0f000) << 4);
5431 }
5432
5433 newimm |= (temp & 0xfffff000);
5434 md_number_to_chars (buf, (valueT) newimm, INSN_SIZE);
5435
5436 highpart |= (newinsn & 0xfffff000);
5437 md_number_to_chars (buf + INSN_SIZE, (valueT) highpart, INSN_SIZE);
5438 }
5439 break;
5440
5441 case BFD_RELOC_ARM_OFFSET_IMM:
5442 sign = value >= 0;
5443
5444 if (value < 0)
5445 value = - value;
5446
5447 if (validate_offset_imm (value, 0) == FAIL)
5448 {
5449 as_bad_where (fixP->fx_file, fixP->fx_line,
5450 _("bad immediate value for offset (%ld)"), (long) value);
5451 break;
5452 }
5453
5454 newval = md_chars_to_number (buf, INSN_SIZE);
5455 newval &= 0xff7ff000;
5456 newval |= value | (sign ? INDEX_UP : 0);
5457 md_number_to_chars (buf, newval, INSN_SIZE);
5458 break;
5459
5460 case BFD_RELOC_ARM_OFFSET_IMM8:
5461 case BFD_RELOC_ARM_HWLITERAL:
5462 sign = value >= 0;
5463
5464 if (value < 0)
5465 value = - value;
5466
5467 if (validate_offset_imm (value, 1) == FAIL)
5468 {
5469 if (fixP->fx_r_type == BFD_RELOC_ARM_HWLITERAL)
5470 as_bad_where (fixP->fx_file, fixP->fx_line,
5471 _("invalid literal constant: pool needs to be closer"));
5472 else
5473 as_bad (_("bad immediate value for half-word offset (%ld)"),
5474 (long) value);
5475 break;
5476 }
5477
5478 newval = md_chars_to_number (buf, INSN_SIZE);
5479 newval &= 0xff7ff0f0;
5480 newval |= ((value >> 4) << 8) | (value & 0xf) | (sign ? INDEX_UP : 0);
5481 md_number_to_chars (buf, newval, INSN_SIZE);
5482 break;
5483
5484 case BFD_RELOC_ARM_LITERAL:
5485 sign = value >= 0;
5486
5487 if (value < 0)
5488 value = - value;
5489
5490 if (validate_offset_imm (value, 0) == FAIL)
5491 {
5492 as_bad_where (fixP->fx_file, fixP->fx_line,
5493 _("invalid literal constant: pool needs to be closer"));
5494 break;
5495 }
5496
5497 newval = md_chars_to_number (buf, INSN_SIZE);
5498 newval &= 0xff7ff000;
5499 newval |= value | (sign ? INDEX_UP : 0);
5500 md_number_to_chars (buf, newval, INSN_SIZE);
5501 break;
5502
5503 case BFD_RELOC_ARM_SHIFT_IMM:
5504 newval = md_chars_to_number (buf, INSN_SIZE);
5505 if (((unsigned long) value) > 32
5506 || (value == 32
5507 && (((newval & 0x60) == 0) || (newval & 0x60) == 0x60)))
5508 {
5509 as_bad_where (fixP->fx_file, fixP->fx_line,
5510 _("shift expression is too large"));
5511 break;
5512 }
5513
5514 if (value == 0)
5515 newval &= ~0x60; /* Shifts of zero must be done as lsl */
5516 else if (value == 32)
5517 value = 0;
5518 newval &= 0xfffff07f;
5519 newval |= (value & 0x1f) << 7;
5520 md_number_to_chars (buf, newval , INSN_SIZE);
5521 break;
5522
5523 case BFD_RELOC_ARM_SWI:
5524 if (arm_data->thumb_mode)
5525 {
5526 if (((unsigned long) value) > 0xff)
5527 as_bad_where (fixP->fx_file, fixP->fx_line,
5528 _("Invalid swi expression"));
5529 newval = md_chars_to_number (buf, THUMB_SIZE) & 0xff00;
5530 newval |= value;
5531 md_number_to_chars (buf, newval, THUMB_SIZE);
5532 }
5533 else
5534 {
5535 if (((unsigned long) value) > 0x00ffffff)
5536 as_bad_where (fixP->fx_file, fixP->fx_line,
5537 _("Invalid swi expression"));
5538 newval = md_chars_to_number (buf, INSN_SIZE) & 0xff000000;
5539 newval |= value;
5540 md_number_to_chars (buf, newval , INSN_SIZE);
5541 }
5542 break;
5543
5544 case BFD_RELOC_ARM_MULTI:
5545 if (((unsigned long) value) > 0xffff)
5546 as_bad_where (fixP->fx_file, fixP->fx_line,
5547 _("Invalid expression in load/store multiple"));
5548 newval = value | md_chars_to_number (buf, INSN_SIZE);
5549 md_number_to_chars (buf, newval, INSN_SIZE);
5550 break;
5551
5552 case BFD_RELOC_ARM_PCREL_BRANCH:
5553 newval = md_chars_to_number (buf, INSN_SIZE);
5554
5555 /* Sign-extend a 24-bit number. */
5556 #define SEXT24(x) ((((x) & 0xffffff) ^ (~ 0x7fffff)) + 0x800000)
5557
5558 #ifdef OBJ_ELF
5559 if (! target_oabi)
5560 value = fixP->fx_offset;
5561 #endif
5562
5563 /* We are going to store value (shifted right by two) in the
5564 instruction, in a 24 bit, signed field. Thus we need to check
5565 that none of the top 8 bits of the shifted value (top 7 bits of
5566 the unshifted, unsigned value) are set, or that they are all set. */
5567 if ((value & 0xfe000000UL) != 0
5568 && ((value & 0xfe000000UL) != 0xfe000000UL))
5569 {
5570 #ifdef OBJ_ELF
5571 /* Normally we would be stuck at this point, since we cannot store
5572 the absolute address that is the destination of the branch in the
5573 24 bits of the branch instruction. If however, we happen to know
5574 that the destination of the branch is in the same section as the
5575 branch instruciton itself, then we can compute the relocation for
5576 ourselves and not have to bother the linker with it.
5577
5578 FIXME: The tests for OBJ_ELF and ! target_oabi are only here
5579 because I have not worked out how to do this for OBJ_COFF or
5580 target_oabi. */
5581 if (! target_oabi
5582 && fixP->fx_addsy != NULL
5583 && S_IS_DEFINED (fixP->fx_addsy)
5584 && S_GET_SEGMENT (fixP->fx_addsy) == seg)
5585 {
5586 /* Get pc relative value to go into the branch. */
5587 value = * val;
5588
5589 /* Permit a backward branch provided that enough bits are set.
5590 Allow a forwards branch, provided that enough bits are clear. */
5591 if ((value & 0xfe000000UL) == 0xfe000000UL
5592 || (value & 0xfe000000UL) == 0)
5593 fixP->fx_done = 1;
5594 }
5595
5596 if (! fixP->fx_done)
5597 #endif
5598 as_bad_where (fixP->fx_file, fixP->fx_line,
5599 _("gas can't handle same-section branch dest >= 0x04000000"));
5600 }
5601
5602 value >>= 2;
5603 value += SEXT24 (newval);
5604
5605 if ((value & 0xff000000UL) != 0
5606 && (fixP->fx_done == 0
5607 || ((value & 0xff000000UL) != 0xff000000UL)))
5608 as_bad_where (fixP->fx_file, fixP->fx_line,
5609 _("out of range branch"));
5610
5611 newval = (value & 0x00ffffff) | (newval & 0xff000000);
5612 md_number_to_chars (buf, newval, INSN_SIZE);
5613 break;
5614
5615
5616 case BFD_RELOC_THUMB_PCREL_BRANCH9: /* conditional branch */
5617 newval = md_chars_to_number (buf, THUMB_SIZE);
5618 {
5619 addressT diff = (newval & 0xff) << 1;
5620 if (diff & 0x100)
5621 diff |= ~0xff;
5622
5623 value += diff;
5624 if ((value & ~0xff) && ((value & ~0xff) != ~0xff))
5625 as_bad_where (fixP->fx_file, fixP->fx_line,
5626 _("Branch out of range"));
5627 newval = (newval & 0xff00) | ((value & 0x1ff) >> 1);
5628 }
5629 md_number_to_chars (buf, newval, THUMB_SIZE);
5630 break;
5631
5632 case BFD_RELOC_THUMB_PCREL_BRANCH12: /* unconditional branch */
5633 newval = md_chars_to_number (buf, THUMB_SIZE);
5634 {
5635 addressT diff = (newval & 0x7ff) << 1;
5636 if (diff & 0x800)
5637 diff |= ~0x7ff;
5638
5639 value += diff;
5640 if ((value & ~0x7ff) && ((value & ~0x7ff) != ~0x7ff))
5641 as_bad_where (fixP->fx_file, fixP->fx_line,
5642 _("Branch out of range"));
5643 newval = (newval & 0xf800) | ((value & 0xfff) >> 1);
5644 }
5645 md_number_to_chars (buf, newval, THUMB_SIZE);
5646 break;
5647
5648 case BFD_RELOC_THUMB_PCREL_BRANCH23:
5649 {
5650 offsetT newval2;
5651 addressT diff;
5652
5653 newval = md_chars_to_number (buf, THUMB_SIZE);
5654 newval2 = md_chars_to_number (buf + THUMB_SIZE, THUMB_SIZE);
5655 diff = ((newval & 0x7ff) << 12) | ((newval2 & 0x7ff) << 1);
5656 if (diff & 0x400000)
5657 diff |= ~0x3fffff;
5658 #ifdef OBJ_ELF
5659 value = fixP->fx_offset;
5660 #endif
5661 value += diff;
5662 if ((value & ~0x3fffff) && ((value & ~0x3fffff) != ~0x3fffff))
5663 as_bad_where (fixP->fx_file, fixP->fx_line,
5664 _("Branch with link out of range"));
5665
5666 newval = (newval & 0xf800) | ((value & 0x7fffff) >> 12);
5667 newval2 = (newval2 & 0xf800) | ((value & 0xfff) >> 1);
5668 md_number_to_chars (buf, newval, THUMB_SIZE);
5669 md_number_to_chars (buf + THUMB_SIZE, newval2, THUMB_SIZE);
5670 }
5671 break;
5672
5673 case BFD_RELOC_8:
5674 if (fixP->fx_done || fixP->fx_pcrel)
5675 md_number_to_chars (buf, value, 1);
5676 #ifdef OBJ_ELF
5677 else if (!target_oabi)
5678 {
5679 value = fixP->fx_offset;
5680 md_number_to_chars (buf, value, 1);
5681 }
5682 #endif
5683 break;
5684
5685 case BFD_RELOC_16:
5686 if (fixP->fx_done || fixP->fx_pcrel)
5687 md_number_to_chars (buf, value, 2);
5688 #ifdef OBJ_ELF
5689 else if (!target_oabi)
5690 {
5691 value = fixP->fx_offset;
5692 md_number_to_chars (buf, value, 2);
5693 }
5694 #endif
5695 break;
5696
5697 #ifdef OBJ_ELF
5698 case BFD_RELOC_ARM_GOT32:
5699 case BFD_RELOC_ARM_GOTOFF:
5700 md_number_to_chars (buf, 0, 4);
5701 break;
5702 #endif
5703
5704 case BFD_RELOC_RVA:
5705 case BFD_RELOC_32:
5706 if (fixP->fx_done || fixP->fx_pcrel)
5707 md_number_to_chars (buf, value, 4);
5708 #ifdef OBJ_ELF
5709 else if (!target_oabi)
5710 {
5711 value = fixP->fx_offset;
5712 md_number_to_chars (buf, value, 4);
5713 }
5714 #endif
5715 break;
5716
5717 #ifdef OBJ_ELF
5718 case BFD_RELOC_ARM_PLT32:
5719 /* It appears the instruction is fully prepared at this point. */
5720 break;
5721 #endif
5722
5723 case BFD_RELOC_ARM_GOTPC:
5724 md_number_to_chars (buf, value, 4);
5725 break;
5726
5727 case BFD_RELOC_ARM_CP_OFF_IMM:
5728 sign = value >= 0;
5729 if (value < -1023 || value > 1023 || (value & 3))
5730 as_bad_where (fixP->fx_file, fixP->fx_line,
5731 _("Illegal value for co-processor offset"));
5732 if (value < 0)
5733 value = -value;
5734 newval = md_chars_to_number (buf, INSN_SIZE) & 0xff7fff00;
5735 newval |= (value >> 2) | (sign ? INDEX_UP : 0);
5736 md_number_to_chars (buf, newval , INSN_SIZE);
5737 break;
5738
5739 case BFD_RELOC_ARM_THUMB_OFFSET:
5740 newval = md_chars_to_number (buf, THUMB_SIZE);
5741 /* Exactly what ranges, and where the offset is inserted depends on
5742 the type of instruction, we can establish this from the top 4 bits */
5743 switch (newval >> 12)
5744 {
5745 case 4: /* PC load */
5746 /* Thumb PC loads are somewhat odd, bit 1 of the PC is
5747 forced to zero for these loads, so we will need to round
5748 up the offset if the instruction address is not word
5749 aligned (since the final address produced must be, and
5750 we can only describe word-aligned immediate offsets). */
5751
5752 if ((fixP->fx_frag->fr_address + fixP->fx_where + value) & 3)
5753 as_bad_where (fixP->fx_file, fixP->fx_line,
5754 _("Invalid offset, target not word aligned (0x%08X)"),
5755 (unsigned int)(fixP->fx_frag->fr_address + fixP->fx_where + value));
5756
5757 if ((value + 2) & ~0x3fe)
5758 as_bad_where (fixP->fx_file, fixP->fx_line,
5759 _("Invalid offset, value too big (0x%08X)"), value);
5760
5761 /* Round up, since pc will be rounded down. */
5762 newval |= (value + 2) >> 2;
5763 break;
5764
5765 case 9: /* SP load/store */
5766 if (value & ~0x3fc)
5767 as_bad_where (fixP->fx_file, fixP->fx_line,
5768 _("Invalid offset, value too big (0x%08X)"), value);
5769 newval |= value >> 2;
5770 break;
5771
5772 case 6: /* Word load/store */
5773 if (value & ~0x7c)
5774 as_bad_where (fixP->fx_file, fixP->fx_line,
5775 _("Invalid offset, value too big (0x%08X)"), value);
5776 newval |= value << 4; /* 6 - 2 */
5777 break;
5778
5779 case 7: /* Byte load/store */
5780 if (value & ~0x1f)
5781 as_bad_where (fixP->fx_file, fixP->fx_line,
5782 _("Invalid offset, value too big (0x%08X)"), value);
5783 newval |= value << 6;
5784 break;
5785
5786 case 8: /* Halfword load/store */
5787 if (value & ~0x3e)
5788 as_bad_where (fixP->fx_file, fixP->fx_line,
5789 _("Invalid offset, value too big (0x%08X)"), value);
5790 newval |= value << 5; /* 6 - 1 */
5791 break;
5792
5793 default:
5794 as_bad_where (fixP->fx_file, fixP->fx_line,
5795 "Unable to process relocation for thumb opcode: %lx",
5796 (unsigned long) newval);
5797 break;
5798 }
5799 md_number_to_chars (buf, newval, THUMB_SIZE);
5800 break;
5801
5802 case BFD_RELOC_ARM_THUMB_ADD:
5803 /* This is a complicated relocation, since we use it for all of
5804 the following immediate relocations:
5805 3bit ADD/SUB
5806 8bit ADD/SUB
5807 9bit ADD/SUB SP word-aligned
5808 10bit ADD PC/SP word-aligned
5809
5810 The type of instruction being processed is encoded in the
5811 instruction field:
5812 0x8000 SUB
5813 0x00F0 Rd
5814 0x000F Rs
5815 */
5816 newval = md_chars_to_number (buf, THUMB_SIZE);
5817 {
5818 int rd = (newval >> 4) & 0xf;
5819 int rs = newval & 0xf;
5820 int subtract = newval & 0x8000;
5821
5822 if (rd == REG_SP)
5823 {
5824 if (value & ~0x1fc)
5825 as_bad_where (fixP->fx_file, fixP->fx_line,
5826 _("Invalid immediate for stack address calculation"));
5827 newval = subtract ? T_OPCODE_SUB_ST : T_OPCODE_ADD_ST;
5828 newval |= value >> 2;
5829 }
5830 else if (rs == REG_PC || rs == REG_SP)
5831 {
5832 if (subtract ||
5833 value & ~0x3fc)
5834 as_bad_where (fixP->fx_file, fixP->fx_line,
5835 _("Invalid immediate for address calculation (value = 0x%08lX)"),
5836 (unsigned long) value);
5837 newval = (rs == REG_PC ? T_OPCODE_ADD_PC : T_OPCODE_ADD_SP);
5838 newval |= rd << 8;
5839 newval |= value >> 2;
5840 }
5841 else if (rs == rd)
5842 {
5843 if (value & ~0xff)
5844 as_bad_where (fixP->fx_file, fixP->fx_line,
5845 _("Invalid 8bit immediate"));
5846 newval = subtract ? T_OPCODE_SUB_I8 : T_OPCODE_ADD_I8;
5847 newval |= (rd << 8) | value;
5848 }
5849 else
5850 {
5851 if (value & ~0x7)
5852 as_bad_where (fixP->fx_file, fixP->fx_line,
5853 _("Invalid 3bit immediate"));
5854 newval = subtract ? T_OPCODE_SUB_I3 : T_OPCODE_ADD_I3;
5855 newval |= rd | (rs << 3) | (value << 6);
5856 }
5857 }
5858 md_number_to_chars (buf, newval , THUMB_SIZE);
5859 break;
5860
5861 case BFD_RELOC_ARM_THUMB_IMM:
5862 newval = md_chars_to_number (buf, THUMB_SIZE);
5863 switch (newval >> 11)
5864 {
5865 case 0x04: /* 8bit immediate MOV */
5866 case 0x05: /* 8bit immediate CMP */
5867 if (value < 0 || value > 255)
5868 as_bad_where (fixP->fx_file, fixP->fx_line,
5869 _("Invalid immediate: %ld is too large"),
5870 (long) value);
5871 newval |= value;
5872 break;
5873
5874 default:
5875 abort ();
5876 }
5877 md_number_to_chars (buf, newval , THUMB_SIZE);
5878 break;
5879
5880 case BFD_RELOC_ARM_THUMB_SHIFT:
5881 /* 5bit shift value (0..31) */
5882 if (value < 0 || value > 31)
5883 as_bad_where (fixP->fx_file, fixP->fx_line,
5884 _("Illegal Thumb shift value: %ld"), (long) value);
5885 newval = md_chars_to_number (buf, THUMB_SIZE) & 0xf03f;
5886 newval |= value << 6;
5887 md_number_to_chars (buf, newval , THUMB_SIZE);
5888 break;
5889
5890 case BFD_RELOC_VTABLE_INHERIT:
5891 case BFD_RELOC_VTABLE_ENTRY:
5892 fixP->fx_done = 0;
5893 return 1;
5894
5895 case BFD_RELOC_NONE:
5896 default:
5897 as_bad_where (fixP->fx_file, fixP->fx_line,
5898 _("Bad relocation fixup type (%d)"), fixP->fx_r_type);
5899 }
5900
5901 return 1;
5902 }
5903
5904 /* Translate internal representation of relocation info to BFD target
5905 format. */
5906 arelent *
5907 tc_gen_reloc (section, fixp)
5908 asection * section ATTRIBUTE_UNUSED;
5909 fixS * fixp;
5910 {
5911 arelent * reloc;
5912 bfd_reloc_code_real_type code;
5913
5914 reloc = (arelent *) xmalloc (sizeof (arelent));
5915
5916 reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
5917 *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
5918 reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
5919
5920 /* @@ Why fx_addnumber sometimes and fx_offset other times? */
5921 #ifndef OBJ_ELF
5922 if (fixp->fx_pcrel == 0)
5923 reloc->addend = fixp->fx_offset;
5924 else
5925 reloc->addend = fixp->fx_offset = reloc->address;
5926 #else /* OBJ_ELF */
5927 reloc->addend = fixp->fx_offset;
5928 #endif
5929
5930 switch (fixp->fx_r_type)
5931 {
5932 case BFD_RELOC_8:
5933 if (fixp->fx_pcrel)
5934 {
5935 code = BFD_RELOC_8_PCREL;
5936 break;
5937 }
5938
5939 case BFD_RELOC_16:
5940 if (fixp->fx_pcrel)
5941 {
5942 code = BFD_RELOC_16_PCREL;
5943 break;
5944 }
5945
5946 case BFD_RELOC_32:
5947 if (fixp->fx_pcrel)
5948 {
5949 code = BFD_RELOC_32_PCREL;
5950 break;
5951 }
5952
5953 case BFD_RELOC_ARM_PCREL_BRANCH:
5954 case BFD_RELOC_RVA:
5955 case BFD_RELOC_THUMB_PCREL_BRANCH9:
5956 case BFD_RELOC_THUMB_PCREL_BRANCH12:
5957 case BFD_RELOC_THUMB_PCREL_BRANCH23:
5958 case BFD_RELOC_VTABLE_ENTRY:
5959 case BFD_RELOC_VTABLE_INHERIT:
5960 code = fixp->fx_r_type;
5961 break;
5962
5963 case BFD_RELOC_ARM_LITERAL:
5964 case BFD_RELOC_ARM_HWLITERAL:
5965 /* If this is called then the a literal has been referenced across
5966 a section boundary - possibly due to an implicit dump */
5967 as_bad_where (fixp->fx_file, fixp->fx_line,
5968 _("Literal referenced across section boundary (Implicit dump?)"));
5969 return NULL;
5970
5971 #ifdef OBJ_ELF
5972 case BFD_RELOC_ARM_GOT32:
5973 case BFD_RELOC_ARM_GOTOFF:
5974 case BFD_RELOC_ARM_PLT32:
5975 code = fixp->fx_r_type;
5976 break;
5977 #endif
5978
5979 case BFD_RELOC_ARM_IMMEDIATE:
5980 as_bad_where (fixp->fx_file, fixp->fx_line,
5981 _("Internal_relocation (type %d) not fixed up (IMMEDIATE)"),
5982 fixp->fx_r_type);
5983 return NULL;
5984
5985 case BFD_RELOC_ARM_ADRL_IMMEDIATE:
5986 as_bad_where (fixp->fx_file, fixp->fx_line,
5987 _("ADRL used for a symbol not defined in the same file"),
5988 fixp->fx_r_type);
5989 return NULL;
5990
5991 case BFD_RELOC_ARM_OFFSET_IMM:
5992 as_bad_where (fixp->fx_file, fixp->fx_line,
5993 _("Internal_relocation (type %d) not fixed up (OFFSET_IMM)"),
5994 fixp->fx_r_type);
5995 return NULL;
5996
5997 default:
5998 {
5999 char * type;
6000 switch (fixp->fx_r_type)
6001 {
6002 case BFD_RELOC_ARM_IMMEDIATE: type = "IMMEDIATE"; break;
6003 case BFD_RELOC_ARM_OFFSET_IMM: type = "OFFSET_IMM"; break;
6004 case BFD_RELOC_ARM_OFFSET_IMM8: type = "OFFSET_IMM8"; break;
6005 case BFD_RELOC_ARM_SHIFT_IMM: type = "SHIFT_IMM"; break;
6006 case BFD_RELOC_ARM_SWI: type = "SWI"; break;
6007 case BFD_RELOC_ARM_MULTI: type = "MULTI"; break;
6008 case BFD_RELOC_ARM_CP_OFF_IMM: type = "CP_OFF_IMM"; break;
6009 case BFD_RELOC_ARM_THUMB_ADD: type = "THUMB_ADD"; break;
6010 case BFD_RELOC_ARM_THUMB_SHIFT: type = "THUMB_SHIFT"; break;
6011 case BFD_RELOC_ARM_THUMB_IMM: type = "THUMB_IMM"; break;
6012 case BFD_RELOC_ARM_THUMB_OFFSET: type = "THUMB_OFFSET"; break;
6013 default: type = _("<unknown>"); break;
6014 }
6015 as_bad_where (fixp->fx_file, fixp->fx_line,
6016 _("Can not represent %s relocation in this object file format (%d)"),
6017 type, fixp->fx_pcrel);
6018 return NULL;
6019 }
6020 }
6021
6022 #ifdef OBJ_ELF
6023 if (code == BFD_RELOC_32_PCREL
6024 && GOT_symbol
6025 && fixp->fx_addsy == GOT_symbol)
6026 {
6027 code = BFD_RELOC_ARM_GOTPC;
6028 reloc->addend = fixp->fx_offset = reloc->address;
6029 }
6030 #endif
6031
6032 reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
6033
6034 if (reloc->howto == NULL)
6035 {
6036 as_bad_where (fixp->fx_file, fixp->fx_line,
6037 _("Can not represent %s relocation in this object file format"),
6038 bfd_get_reloc_code_name (code));
6039 return NULL;
6040 }
6041
6042 /* HACK: Since arm ELF uses Rel instead of Rela, encode the
6043 vtable entry to be used in the relocation's section offset. */
6044 if (fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
6045 reloc->address = fixp->fx_offset;
6046
6047 return reloc;
6048 }
6049
6050 int
6051 md_estimate_size_before_relax (fragP, segtype)
6052 fragS * fragP ATTRIBUTE_UNUSED;
6053 segT segtype ATTRIBUTE_UNUSED;
6054 {
6055 as_fatal (_("md_estimate_size_before_relax\n"));
6056 return 1;
6057 }
6058
6059 static void
6060 output_inst PARAMS ((void))
6061 {
6062 char * to = NULL;
6063
6064 if (inst.error)
6065 {
6066 as_bad (inst.error);
6067 return;
6068 }
6069
6070 to = frag_more (inst.size);
6071
6072 if (thumb_mode && (inst.size > THUMB_SIZE))
6073 {
6074 assert (inst.size == (2 * THUMB_SIZE));
6075 md_number_to_chars (to, inst.instruction >> 16, THUMB_SIZE);
6076 md_number_to_chars (to + THUMB_SIZE, inst.instruction, THUMB_SIZE);
6077 }
6078 else if (inst.size > INSN_SIZE)
6079 {
6080 assert (inst.size == (2 * INSN_SIZE));
6081 md_number_to_chars (to, inst.instruction, INSN_SIZE);
6082 md_number_to_chars (to + INSN_SIZE, inst.instruction, INSN_SIZE);
6083 }
6084 else
6085 md_number_to_chars (to, inst.instruction, inst.size);
6086
6087 if (inst.reloc.type != BFD_RELOC_NONE)
6088 fix_new_arm (frag_now, to - frag_now->fr_literal,
6089 inst.size, & inst.reloc.exp, inst.reloc.pc_rel,
6090 inst.reloc.type);
6091
6092 return;
6093 }
6094
6095 void
6096 md_assemble (str)
6097 char * str;
6098 {
6099 char c;
6100 char * p;
6101 char * q;
6102 char * start;
6103
6104 /* Align the instruction.
6105 This may not be the right thing to do but ... */
6106 /* arm_align (2, 0); */
6107 listing_prev_line (); /* Defined in listing.h */
6108
6109 /* Align the previous label if needed. */
6110 if (last_label_seen != NULL)
6111 {
6112 symbol_set_frag (last_label_seen, frag_now);
6113 S_SET_VALUE (last_label_seen, (valueT) frag_now_fix ());
6114 S_SET_SEGMENT (last_label_seen, now_seg);
6115 }
6116
6117 memset (&inst, '\0', sizeof (inst));
6118 inst.reloc.type = BFD_RELOC_NONE;
6119
6120 skip_whitespace (str);
6121
6122 /* Scan up to the end of the op-code, which must end in white space or
6123 end of string. */
6124 for (start = p = str; *p != '\0'; p++)
6125 if (*p == ' ')
6126 break;
6127
6128 if (p == str)
6129 {
6130 as_bad (_("No operator -- statement `%s'\n"), str);
6131 return;
6132 }
6133
6134 if (thumb_mode)
6135 {
6136 CONST struct thumb_opcode * opcode;
6137
6138 c = *p;
6139 *p = '\0';
6140 opcode = (CONST struct thumb_opcode *) hash_find (arm_tops_hsh, str);
6141 *p = c;
6142
6143 if (opcode)
6144 {
6145 /* Check that this instruction is supported for this CPU. */
6146 if (thumb_mode == 1 && (opcode->variants & cpu_variant) == 0)
6147 {
6148 as_bad (_("selected processor does not support this opcode"));
6149 return;
6150 }
6151
6152 inst.instruction = opcode->value;
6153 inst.size = opcode->size;
6154 (*opcode->parms)(p);
6155 output_inst ();
6156 return;
6157 }
6158 }
6159 else
6160 {
6161 CONST struct asm_opcode * opcode;
6162 unsigned long cond_code;
6163
6164 inst.size = INSN_SIZE;
6165 /* p now points to the end of the opcode, probably white space, but we
6166 have to break the opcode up in case it contains condionals and flags;
6167 keep trying with progressively smaller basic instructions until one
6168 matches, or we run out of opcode. */
6169 q = (p - str > LONGEST_INST) ? str + LONGEST_INST : p;
6170 for (; q != str; q--)
6171 {
6172 c = *q;
6173 *q = '\0';
6174 opcode = (CONST struct asm_opcode *) hash_find (arm_ops_hsh, str);
6175 *q = c;
6176
6177 if (opcode && opcode->template)
6178 {
6179 unsigned long flag_bits = 0;
6180 char * r;
6181
6182 /* Check that this instruction is supported for this CPU. */
6183 if ((opcode->variants & cpu_variant) == 0)
6184 goto try_shorter;
6185
6186 inst.instruction = opcode->value;
6187 if (q == p) /* Just a simple opcode. */
6188 {
6189 if (opcode->comp_suffix)
6190 {
6191 if (*opcode->comp_suffix != '\0')
6192 as_bad (_("Opcode `%s' must have suffix from list: <%s>"),
6193 str, opcode->comp_suffix);
6194 else
6195 /* Not a conditional instruction. */
6196 (*opcode->parms)(q, 0);
6197 }
6198 else
6199 {
6200 /* A conditional instruction with default condition. */
6201 inst.instruction |= COND_ALWAYS;
6202 (*opcode->parms)(q, 0);
6203 }
6204 output_inst ();
6205 return;
6206 }
6207
6208 /* Not just a simple opcode. Check if extra is a conditional. */
6209 r = q;
6210 if (p - r >= 2)
6211 {
6212 CONST struct asm_cond *cond;
6213 char d = *(r + 2);
6214
6215 *(r + 2) = '\0';
6216 cond = (CONST struct asm_cond *) hash_find (arm_cond_hsh, r);
6217 *(r + 2) = d;
6218 if (cond)
6219 {
6220 if (cond->value == 0xf0000000)
6221 as_tsktsk (
6222 _("Warning: Use of the 'nv' conditional is deprecated\n"));
6223
6224 cond_code = cond->value;
6225 r += 2;
6226 }
6227 else
6228 cond_code = COND_ALWAYS;
6229 }
6230 else
6231 cond_code = COND_ALWAYS;
6232
6233 /* Apply the conditional, or complain it's not allowed. */
6234 if (opcode->comp_suffix && *opcode->comp_suffix == '\0')
6235 {
6236 /* Instruction isn't conditional */
6237 if (cond_code != COND_ALWAYS)
6238 {
6239 as_bad (_("Opcode `%s' is unconditional\n"), str);
6240 return;
6241 }
6242 }
6243 else
6244 /* Instruction is conditional: set the condition into it. */
6245 inst.instruction |= cond_code;
6246
6247
6248 /* If there is a compulsory suffix, it should come here, before
6249 any optional flags. */
6250 if (opcode->comp_suffix && *opcode->comp_suffix != '\0')
6251 {
6252 CONST char *s = opcode->comp_suffix;
6253
6254 while (*s)
6255 {
6256 inst.suffix++;
6257 if (*r == *s)
6258 break;
6259 s++;
6260 }
6261
6262 if (*s == '\0')
6263 {
6264 as_bad (_("Opcode `%s' must have suffix from <%s>\n"), str,
6265 opcode->comp_suffix);
6266 return;
6267 }
6268
6269 r++;
6270 }
6271
6272 /* The remainder, if any should now be flags for the instruction;
6273 Scan these checking each one found with the opcode. */
6274 if (r != p)
6275 {
6276 char d;
6277 CONST struct asm_flg *flag = opcode->flags;
6278
6279 if (flag)
6280 {
6281 int flagno;
6282
6283 d = *p;
6284 *p = '\0';
6285
6286 for (flagno = 0; flag[flagno].template; flagno++)
6287 {
6288 if (streq (r, flag[flagno].template))
6289 {
6290 flag_bits |= flag[flagno].set_bits;
6291 break;
6292 }
6293 }
6294
6295 *p = d;
6296 if (! flag[flagno].template)
6297 goto try_shorter;
6298 }
6299 else
6300 goto try_shorter;
6301 }
6302
6303 (*opcode->parms) (p, flag_bits);
6304 output_inst ();
6305 return;
6306 }
6307
6308 try_shorter:
6309 ;
6310 }
6311 }
6312
6313 /* It wasn't an instruction, but it might be a register alias of the form
6314 alias .req reg */
6315 q = p;
6316 skip_whitespace (q);
6317
6318 c = *p;
6319 *p = '\0';
6320
6321 if (*q && !strncmp (q, ".req ", 4))
6322 {
6323 int reg;
6324 char * copy_of_str = str;
6325 char * r;
6326
6327 q += 4;
6328 skip_whitespace (q);
6329
6330 for (r = q; *r != '\0'; r++)
6331 if (*r == ' ')
6332 break;
6333
6334 if (r != q)
6335 {
6336 int regnum;
6337 char d = *r;
6338
6339 *r = '\0';
6340 regnum = arm_reg_parse (& q);
6341 *r = d;
6342
6343 reg = arm_reg_parse (& str);
6344
6345 if (reg == FAIL)
6346 {
6347 if (regnum != FAIL)
6348 insert_reg_alias (str, regnum);
6349 else
6350 as_warn (_("register '%s' does not exist\n"), q);
6351 }
6352 else if (regnum != FAIL)
6353 {
6354 if (reg != regnum)
6355 as_warn (_("ignoring redefinition of register alias '%s'"),
6356 copy_of_str );
6357
6358 /* Do not warn about redefinitions to the same alias. */
6359 }
6360 else
6361 as_warn (_("ignoring redefinition of register alias '%s' to non-existant register '%s'"),
6362 copy_of_str, q);
6363 }
6364 else
6365 as_warn (_("ignoring incomplete .req pseuso op"));
6366
6367 *p = c;
6368 return;
6369 }
6370
6371 *p = c;
6372 as_bad (_("bad instruction `%s'"), start);
6373 }
6374
6375 /*
6376 * md_parse_option
6377 * Invocation line includes a switch not recognized by the base assembler.
6378 * See if it's a processor-specific option. These are:
6379 * Cpu variants, the arm part is optional:
6380 * -m[arm]1 Currently not supported.
6381 * -m[arm]2, -m[arm]250 Arm 2 and Arm 250 processor
6382 * -m[arm]3 Arm 3 processor
6383 * -m[arm]6[xx], Arm 6 processors
6384 * -m[arm]7[xx][t][[d]m] Arm 7 processors
6385 * -m[arm]8[10] Arm 8 processors
6386 * -m[arm]9[20][tdmi] Arm 9 processors
6387 * -mstrongarm[110[0]] StrongARM processors
6388 * -m[arm]v[2345] Arm architectures
6389 * -mall All (except the ARM1)
6390 * FP variants:
6391 * -mfpa10, -mfpa11 FPA10 and 11 co-processor instructions
6392 * -mfpe-old (No float load/store multiples)
6393 * -mno-fpu Disable all floating point instructions
6394 * Run-time endian selection:
6395 * -EB big endian cpu
6396 * -EL little endian cpu
6397 * ARM Procedure Calling Standard:
6398 * -mapcs-32 32 bit APCS
6399 * -mapcs-26 26 bit APCS
6400 * -mapcs-float Pass floats in float regs
6401 * -mapcs-reentrant Position independent code
6402 * -mthumb-interwork Code supports Arm/Thumb interworking
6403 * -moabi Old ELF ABI
6404 */
6405
6406 CONST char * md_shortopts = "m:k";
6407 struct option md_longopts[] =
6408 {
6409 #ifdef ARM_BI_ENDIAN
6410 #define OPTION_EB (OPTION_MD_BASE + 0)
6411 {"EB", no_argument, NULL, OPTION_EB},
6412 #define OPTION_EL (OPTION_MD_BASE + 1)
6413 {"EL", no_argument, NULL, OPTION_EL},
6414 #ifdef OBJ_ELF
6415 #define OPTION_OABI (OPTION_MD_BASE +2)
6416 {"oabi", no_argument, NULL, OPTION_OABI},
6417 #endif
6418 #endif
6419 {NULL, no_argument, NULL, 0}
6420 };
6421 size_t md_longopts_size = sizeof (md_longopts);
6422
6423 int
6424 md_parse_option (c, arg)
6425 int c;
6426 char * arg;
6427 {
6428 char * str = arg;
6429
6430 switch (c)
6431 {
6432 #ifdef ARM_BI_ENDIAN
6433 case OPTION_EB:
6434 target_big_endian = 1;
6435 break;
6436 case OPTION_EL:
6437 target_big_endian = 0;
6438 break;
6439 #endif
6440
6441 case 'm':
6442 switch (*str)
6443 {
6444 case 'f':
6445 if (streq (str, "fpa10"))
6446 cpu_variant = (cpu_variant & ~FPU_ALL) | FPU_FPA10;
6447 else if (streq (str, "fpa11"))
6448 cpu_variant = (cpu_variant & ~FPU_ALL) | FPU_FPA11;
6449 else if (streq (str, "fpe-old"))
6450 cpu_variant = (cpu_variant & ~FPU_ALL) | FPU_CORE;
6451 else
6452 goto bad;
6453 break;
6454
6455 case 'n':
6456 if (streq (str, "no-fpu"))
6457 cpu_variant &= ~FPU_ALL;
6458 break;
6459
6460 #ifdef OBJ_ELF
6461 case 'o':
6462 if (streq (str, "oabi"))
6463 target_oabi = true;
6464 break;
6465 #endif
6466
6467 case 't':
6468 /* Limit assembler to generating only Thumb instructions: */
6469 if (streq (str, "thumb"))
6470 {
6471 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_THUMB;
6472 cpu_variant = (cpu_variant & ~FPU_ALL) | FPU_NONE;
6473 thumb_mode = 1;
6474 }
6475 else if (streq (str, "thumb-interwork"))
6476 {
6477 if ((cpu_variant & ARM_THUMB) == 0)
6478 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_ARCH_V4T;
6479 #if defined OBJ_COFF || defined OBJ_ELF
6480 support_interwork = true;
6481 #endif
6482 }
6483 else
6484 goto bad;
6485 break;
6486
6487 default:
6488 if (streq (str, "all"))
6489 {
6490 cpu_variant = ARM_ALL | FPU_ALL;
6491 return 1;
6492 }
6493 #if defined OBJ_COFF || defined OBJ_ELF
6494 if (! strncmp (str, "apcs-", 5))
6495 {
6496 /* GCC passes on all command line options starting "-mapcs-..."
6497 to us, so we must parse them here. */
6498
6499 str += 5;
6500
6501 if (streq (str, "32"))
6502 {
6503 uses_apcs_26 = false;
6504 return 1;
6505 }
6506 else if (streq (str, "26"))
6507 {
6508 uses_apcs_26 = true;
6509 return 1;
6510 }
6511 else if (streq (str, "frame"))
6512 {
6513 /* Stack frames are being generated - does not affect
6514 linkage of code. */
6515 return 1;
6516 }
6517 else if (streq (str, "stack-check"))
6518 {
6519 /* Stack checking is being performed - does not affect
6520 linkage, but does require that the functions
6521 __rt_stkovf_split_small and __rt_stkovf_split_big be
6522 present in the final link. */
6523
6524 return 1;
6525 }
6526 else if (streq (str, "float"))
6527 {
6528 /* Floating point arguments are being passed in the floating
6529 point registers. This does affect linking, since this
6530 version of the APCS is incompatible with the version that
6531 passes floating points in the integer registers. */
6532
6533 uses_apcs_float = true;
6534 return 1;
6535 }
6536 else if (streq (str, "reentrant"))
6537 {
6538 /* Reentrant code has been generated. This does affect
6539 linking, since there is no point in linking reentrant/
6540 position independent code with absolute position code. */
6541 pic_code = true;
6542 return 1;
6543 }
6544
6545 as_bad (_("Unrecognised APCS switch -m%s"), arg);
6546 return 0;
6547 }
6548 #endif
6549 /* Strip off optional "arm" */
6550 if (! strncmp (str, "arm", 3))
6551 str += 3;
6552
6553 switch (*str)
6554 {
6555 case '1':
6556 if (streq (str, "1"))
6557 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_1;
6558 else
6559 goto bad;
6560 break;
6561
6562 case '2':
6563 if (streq (str, "2"))
6564 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_2;
6565 else if (streq (str, "250"))
6566 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_250;
6567 else
6568 goto bad;
6569 break;
6570
6571 case '3':
6572 if (streq (str, "3"))
6573 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_3;
6574 else
6575 goto bad;
6576 break;
6577
6578 case '6':
6579 switch (strtol (str, NULL, 10))
6580 {
6581 case 6:
6582 case 60:
6583 case 600:
6584 case 610:
6585 case 620:
6586 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_6;
6587 break;
6588 default:
6589 goto bad;
6590 }
6591 break;
6592
6593 case '7':
6594 switch (strtol (str, & str, 10)) /* Eat the processor name */
6595 {
6596 case 7:
6597 case 70:
6598 case 700:
6599 case 710:
6600 case 720:
6601 case 7100:
6602 case 7500:
6603 break;
6604 default:
6605 goto bad;
6606 }
6607 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_7;
6608 for (; *str; str++)
6609 {
6610 switch (* str)
6611 {
6612 case 't':
6613 cpu_variant |= (ARM_THUMB | ARM_ARCH_V4);
6614 break;
6615
6616 case 'm':
6617 cpu_variant |= ARM_LONGMUL;
6618 break;
6619
6620 case 'f': /* fe => fp enabled cpu. */
6621 if (str[1] == 'e')
6622 ++ str;
6623 else
6624 goto bad;
6625
6626 case 'c': /* Left over from 710c processor name. */
6627 case 'd': /* Debug */
6628 case 'i': /* Embedded ICE */
6629 /* Included for completeness in ARM processor naming. */
6630 break;
6631
6632 default:
6633 goto bad;
6634 }
6635 }
6636 break;
6637
6638 case '8':
6639 if (streq (str, "8") || streq (str, "810"))
6640 cpu_variant = (cpu_variant & ~ARM_ANY)
6641 | ARM_8 | ARM_ARCH_V4 | ARM_LONGMUL;
6642 else
6643 goto bad;
6644 break;
6645
6646 case '9':
6647 if (streq (str, "9"))
6648 cpu_variant = (cpu_variant & ~ARM_ANY)
6649 | ARM_9 | ARM_ARCH_V4 | ARM_LONGMUL | ARM_THUMB;
6650 else if (streq (str, "920"))
6651 cpu_variant = (cpu_variant & ~ARM_ANY)
6652 | ARM_9 | ARM_ARCH_V4 | ARM_LONGMUL;
6653 else if (streq (str, "920t"))
6654 cpu_variant = (cpu_variant & ~ARM_ANY)
6655 | ARM_9 | ARM_ARCH_V4 | ARM_LONGMUL | ARM_THUMB;
6656 else if (streq (str, "9tdmi"))
6657 cpu_variant = (cpu_variant & ~ARM_ANY)
6658 | ARM_9 | ARM_ARCH_V4 | ARM_LONGMUL | ARM_THUMB;
6659 else
6660 goto bad;
6661 break;
6662
6663
6664 case 's':
6665 if (streq (str, "strongarm")
6666 || streq (str, "strongarm110")
6667 || streq (str, "strongarm1100"))
6668 cpu_variant = (cpu_variant & ~ARM_ANY)
6669 | ARM_8 | ARM_ARCH_V4 | ARM_LONGMUL;
6670 else
6671 goto bad;
6672 break;
6673
6674 case 'v':
6675 /* Select variant based on architecture rather than processor. */
6676 switch (*++str)
6677 {
6678 case '2':
6679 switch (*++str)
6680 {
6681 case 'a':
6682 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_3;
6683 break;
6684 case 0:
6685 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_2;
6686 break;
6687 default:
6688 as_bad (_("Invalid architecture variant -m%s"), arg);
6689 break;
6690 }
6691 break;
6692
6693 case '3':
6694 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_7;
6695
6696 switch (*++str)
6697 {
6698 case 'm': cpu_variant |= ARM_LONGMUL; break;
6699 case 0: break;
6700 default:
6701 as_bad (_("Invalid architecture variant -m%s"), arg);
6702 break;
6703 }
6704 break;
6705
6706 case '4':
6707 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_ARCH_V4;
6708
6709 switch (*++str)
6710 {
6711 case 't': cpu_variant |= ARM_THUMB; break;
6712 case 0: break;
6713 default:
6714 as_bad (_("Invalid architecture variant -m%s"), arg);
6715 break;
6716 }
6717 break;
6718
6719 case '5':
6720 cpu_variant = (cpu_variant & ~ARM_ANY) | ARM_ARCH_V5;
6721 switch (*++str)
6722 {
6723 case 't': cpu_variant |= ARM_THUMB; break;
6724 case 'e': cpu_variant |= ARM_EXT_V5E; break;
6725 case 0: break;
6726 default:
6727 as_bad (_("Invalid architecture variant -m%s"), arg);
6728 break;
6729 }
6730 break;
6731
6732 default:
6733 as_bad (_("Invalid architecture variant -m%s"), arg);
6734 break;
6735 }
6736 break;
6737
6738 default:
6739 bad:
6740 as_bad (_("Invalid processor variant -m%s"), arg);
6741 return 0;
6742 }
6743 }
6744 break;
6745
6746 #if defined OBJ_ELF || defined OBJ_COFF
6747 case 'k':
6748 pic_code = 1;
6749 break;
6750 #endif
6751
6752 default:
6753 return 0;
6754 }
6755
6756 return 1;
6757 }
6758
6759 void
6760 md_show_usage (fp)
6761 FILE * fp;
6762 {
6763 fprintf (fp, _("\
6764 ARM Specific Assembler Options:\n\
6765 -m[arm][<processor name>] select processor variant\n\
6766 -m[arm]v[2|2a|3|3m|4|4t|5[t][e]] select architecture variant\n\
6767 -mthumb only allow Thumb instructions\n\
6768 -mthumb-interwork mark the assembled code as supporting interworking\n\
6769 -mall allow any instruction\n\
6770 -mfpa10, -mfpa11 select floating point architecture\n\
6771 -mfpe-old don't allow floating-point multiple instructions\n\
6772 -mno-fpu don't allow any floating-point instructions.\n\
6773 -k generate PIC code.\n"));
6774 #if defined OBJ_COFF || defined OBJ_ELF
6775 fprintf (fp, _("\
6776 -mapcs-32, -mapcs-26 specify which ARM Procedure Calling Standard to use\n\
6777 -mapcs-float floating point args are passed in FP regs\n\
6778 -mapcs-reentrant the code is position independent/reentrant\n"));
6779 #endif
6780 #ifdef OBJ_ELF
6781 fprintf (fp, _("\
6782 -moabi support the old ELF ABI\n"));
6783 #endif
6784 #ifdef ARM_BI_ENDIAN
6785 fprintf (fp, _("\
6786 -EB assemble code for a big endian cpu\n\
6787 -EL assemble code for a little endian cpu\n"));
6788 #endif
6789 }
6790
6791 /* We need to be able to fix up arbitrary expressions in some statements.
6792 This is so that we can handle symbols that are an arbitrary distance from
6793 the pc. The most common cases are of the form ((+/-sym -/+ . - 8) & mask),
6794 which returns part of an address in a form which will be valid for
6795 a data instruction. We do this by pushing the expression into a symbol
6796 in the expr_section, and creating a fix for that. */
6797
6798 static void
6799 fix_new_arm (frag, where, size, exp, pc_rel, reloc)
6800 fragS * frag;
6801 int where;
6802 short int size;
6803 expressionS * exp;
6804 int pc_rel;
6805 int reloc;
6806 {
6807 fixS * new_fix;
6808 arm_fix_data * arm_data;
6809
6810 switch (exp->X_op)
6811 {
6812 case O_constant:
6813 case O_symbol:
6814 case O_add:
6815 case O_subtract:
6816 new_fix = fix_new_exp (frag, where, size, exp, pc_rel, reloc);
6817 break;
6818
6819 default:
6820 new_fix = fix_new (frag, where, size, make_expr_symbol (exp), 0,
6821 pc_rel, reloc);
6822 break;
6823 }
6824
6825 /* Mark whether the fix is to a THUMB instruction, or an ARM instruction */
6826 arm_data = (arm_fix_data *) obstack_alloc (& notes, sizeof (arm_fix_data));
6827 new_fix->tc_fix_data = (PTR) arm_data;
6828 arm_data->thumb_mode = thumb_mode;
6829
6830 return;
6831 }
6832
6833
6834 /* This fix_new is called by cons via TC_CONS_FIX_NEW. */
6835 void
6836 cons_fix_new_arm (frag, where, size, exp)
6837 fragS * frag;
6838 int where;
6839 int size;
6840 expressionS * exp;
6841 {
6842 bfd_reloc_code_real_type type;
6843 int pcrel = 0;
6844
6845 /* Pick a reloc ...
6846 *
6847 * @@ Should look at CPU word size.
6848 */
6849 switch (size)
6850 {
6851 case 2:
6852 type = BFD_RELOC_16;
6853 break;
6854 case 4:
6855 default:
6856 type = BFD_RELOC_32;
6857 break;
6858 case 8:
6859 type = BFD_RELOC_64;
6860 break;
6861 }
6862
6863 fix_new_exp (frag, where, (int) size, exp, pcrel, type);
6864 }
6865
6866 /* A good place to do this, although this was probably not intended
6867 for this kind of use. We need to dump the literal pool before
6868 references are made to a null symbol pointer. */
6869 void
6870 arm_cleanup ()
6871 {
6872 if (current_poolP == NULL)
6873 return;
6874
6875 subseg_set (text_section, 0); /* Put it at the end of text section. */
6876 s_ltorg (0);
6877 listing_prev_line ();
6878 }
6879
6880 void
6881 arm_start_line_hook ()
6882 {
6883 last_label_seen = NULL;
6884 }
6885
6886 void
6887 arm_frob_label (sym)
6888 symbolS * sym;
6889 {
6890 last_label_seen = sym;
6891
6892 ARM_SET_THUMB (sym, thumb_mode);
6893
6894 #if defined OBJ_COFF || defined OBJ_ELF
6895 ARM_SET_INTERWORK (sym, support_interwork);
6896 #endif
6897
6898 if (label_is_thumb_function_name)
6899 {
6900 /* When the address of a Thumb function is taken the bottom
6901 bit of that address should be set. This will allow
6902 interworking between Arm and Thumb functions to work
6903 correctly. */
6904
6905 THUMB_SET_FUNC (sym, 1);
6906
6907 label_is_thumb_function_name = false;
6908 }
6909 }
6910
6911 /* Adjust the symbol table. This marks Thumb symbols as distinct from
6912 ARM ones. */
6913
6914 void
6915 arm_adjust_symtab ()
6916 {
6917 #ifdef OBJ_COFF
6918 symbolS * sym;
6919
6920 for (sym = symbol_rootP; sym != NULL; sym = symbol_next (sym))
6921 {
6922 if (ARM_IS_THUMB (sym))
6923 {
6924 if (THUMB_IS_FUNC (sym))
6925 {
6926 /* Mark the symbol as a Thumb function. */
6927 if ( S_GET_STORAGE_CLASS (sym) == C_STAT
6928 || S_GET_STORAGE_CLASS (sym) == C_LABEL) /* This can happen! */
6929 S_SET_STORAGE_CLASS (sym, C_THUMBSTATFUNC);
6930
6931 else if (S_GET_STORAGE_CLASS (sym) == C_EXT)
6932 S_SET_STORAGE_CLASS (sym, C_THUMBEXTFUNC);
6933 else
6934 as_bad (_("%s: unexpected function type: %d"),
6935 S_GET_NAME (sym), S_GET_STORAGE_CLASS (sym));
6936 }
6937 else switch (S_GET_STORAGE_CLASS (sym))
6938 {
6939 case C_EXT:
6940 S_SET_STORAGE_CLASS (sym, C_THUMBEXT);
6941 break;
6942 case C_STAT:
6943 S_SET_STORAGE_CLASS (sym, C_THUMBSTAT);
6944 break;
6945 case C_LABEL:
6946 S_SET_STORAGE_CLASS (sym, C_THUMBLABEL);
6947 break;
6948 default: /* do nothing */
6949 break;
6950 }
6951 }
6952
6953 if (ARM_IS_INTERWORK (sym))
6954 coffsymbol (symbol_get_bfdsym (sym))->native->u.syment.n_flags = 0xFF;
6955 }
6956 #endif
6957 #ifdef OBJ_ELF
6958 symbolS * sym;
6959 char bind;
6960
6961 for (sym = symbol_rootP; sym != NULL; sym = symbol_next (sym))
6962 {
6963 if (ARM_IS_THUMB (sym))
6964 {
6965 elf_symbol_type * elf_sym;
6966
6967 elf_sym = elf_symbol (symbol_get_bfdsym (sym));
6968 bind = ELF_ST_BIND (elf_sym);
6969
6970 /* If it's a .thumb_func, declare it as so,
6971 otherwise tag label as .code 16. */
6972 if (THUMB_IS_FUNC (sym))
6973 elf_sym->internal_elf_sym.st_info =
6974 ELF_ST_INFO (bind, STT_ARM_TFUNC);
6975 else
6976 elf_sym->internal_elf_sym.st_info =
6977 ELF_ST_INFO (bind, STT_ARM_16BIT);
6978 }
6979 }
6980 #endif
6981 }
6982
6983 int
6984 arm_data_in_code ()
6985 {
6986 if (thumb_mode && ! strncmp (input_line_pointer + 1, "data:", 5))
6987 {
6988 *input_line_pointer = '/';
6989 input_line_pointer += 5;
6990 *input_line_pointer = 0;
6991 return 1;
6992 }
6993
6994 return 0;
6995 }
6996
6997 char *
6998 arm_canonicalize_symbol_name (name)
6999 char * name;
7000 {
7001 int len;
7002
7003 if (thumb_mode && (len = strlen (name)) > 5
7004 && streq (name + len - 5, "/data"))
7005 *(name + len - 5) = 0;
7006
7007 return name;
7008 }
7009
7010 boolean
7011 arm_validate_fix (fixP)
7012 fixS * fixP;
7013 {
7014 /* If the destination of the branch is a defined symbol which does not have
7015 the THUMB_FUNC attribute, then we must be calling a function which has
7016 the (interfacearm) attribute. We look for the Thumb entry point to that
7017 function and change the branch to refer to that function instead. */
7018 if ( fixP->fx_r_type == BFD_RELOC_THUMB_PCREL_BRANCH23
7019 && fixP->fx_addsy != NULL
7020 && S_IS_DEFINED (fixP->fx_addsy)
7021 && ! THUMB_IS_FUNC (fixP->fx_addsy))
7022 {
7023 fixP->fx_addsy = find_real_start (fixP->fx_addsy);
7024 return true;
7025 }
7026
7027 return false;
7028 }
7029
7030 #ifdef OBJ_ELF
7031 /* Relocations against Thumb function names must be left unadjusted,
7032 so that the linker can use this information to correctly set the
7033 bottom bit of their addresses. The MIPS version of this function
7034 also prevents relocations that are mips-16 specific, but I do not
7035 know why it does this.
7036
7037 FIXME:
7038 There is one other problem that ought to be addressed here, but
7039 which currently is not: Taking the address of a label (rather
7040 than a function) and then later jumping to that address. Such
7041 addresses also ought to have their bottom bit set (assuming that
7042 they reside in Thumb code), but at the moment they will not. */
7043
7044 boolean
7045 arm_fix_adjustable (fixP)
7046 fixS * fixP;
7047 {
7048 if (fixP->fx_addsy == NULL)
7049 return 1;
7050
7051 /* Prevent all adjustments to global symbols. */
7052 if (S_IS_EXTERN (fixP->fx_addsy))
7053 return 0;
7054
7055 if (S_IS_WEAK (fixP->fx_addsy))
7056 return 0;
7057
7058 if (THUMB_IS_FUNC (fixP->fx_addsy)
7059 && fixP->fx_subsy == NULL)
7060 return 0;
7061
7062 /* We need the symbol name for the VTABLE entries */
7063 if ( fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
7064 || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
7065 return 0;
7066
7067 return 1;
7068 }
7069
7070 const char *
7071 elf32_arm_target_format ()
7072 {
7073 if (target_big_endian)
7074 if (target_oabi)
7075 return "elf32-bigarm-oabi";
7076 else
7077 return "elf32-bigarm";
7078 else
7079 if (target_oabi)
7080 return "elf32-littlearm-oabi";
7081 else
7082 return "elf32-littlearm";
7083 }
7084
7085 void
7086 armelf_frob_symbol (symp, puntp)
7087 symbolS * symp;
7088 int * puntp;
7089 {
7090 elf_frob_symbol (symp, puntp);
7091 }
7092
7093 int
7094 arm_force_relocation (fixp)
7095 struct fix * fixp;
7096 {
7097 if ( fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT
7098 || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY
7099 || fixp->fx_r_type == BFD_RELOC_ARM_PCREL_BRANCH
7100 || fixp->fx_r_type == BFD_RELOC_THUMB_PCREL_BRANCH23)
7101 return 1;
7102
7103 return 0;
7104 }
7105
7106 static bfd_reloc_code_real_type
7107 arm_parse_reloc ()
7108 {
7109 char id[16];
7110 char * ip;
7111 unsigned int i;
7112 static struct
7113 {
7114 char * str;
7115 int len;
7116 bfd_reloc_code_real_type reloc;
7117 }
7118 reloc_map[] =
7119 {
7120 #define MAP(str,reloc) { str, sizeof (str)-1, reloc }
7121 MAP ("(got)", BFD_RELOC_ARM_GOT32),
7122 MAP ("(gotoff)", BFD_RELOC_ARM_GOTOFF),
7123 /* ScottB: Jan 30, 1998 */
7124 /* Added support for parsing "var(PLT)" branch instructions */
7125 /* generated by GCC for PLT relocs */
7126 MAP ("(plt)", BFD_RELOC_ARM_PLT32),
7127 { NULL, 0, BFD_RELOC_UNUSED }
7128 #undef MAP
7129 };
7130
7131 for (i = 0, ip = input_line_pointer;
7132 i < sizeof (id) && (isalnum (*ip) || ispunct (*ip));
7133 i++, ip++)
7134 id[i] = tolower (*ip);
7135
7136 for (i = 0; reloc_map[i].str; i++)
7137 if (strncmp (id, reloc_map[i].str, reloc_map[i].len) == 0)
7138 break;
7139
7140 input_line_pointer += reloc_map[i].len;
7141
7142 return reloc_map[i].reloc;
7143 }
7144
7145 static void
7146 s_arm_elf_cons (nbytes)
7147 int nbytes;
7148 {
7149 expressionS exp;
7150
7151 #ifdef md_flush_pending_output
7152 md_flush_pending_output ();
7153 #endif
7154
7155 if (is_it_end_of_statement ())
7156 {
7157 demand_empty_rest_of_line ();
7158 return;
7159 }
7160
7161 #ifdef md_cons_align
7162 md_cons_align (nbytes);
7163 #endif
7164
7165 do
7166 {
7167 bfd_reloc_code_real_type reloc;
7168
7169 expression (& exp);
7170
7171 if (exp.X_op == O_symbol
7172 && * input_line_pointer == '('
7173 && (reloc = arm_parse_reloc()) != BFD_RELOC_UNUSED)
7174 {
7175 reloc_howto_type * howto = bfd_reloc_type_lookup (stdoutput, reloc);
7176 int size = bfd_get_reloc_size (howto);
7177
7178 if (size > nbytes)
7179 as_bad ("%s relocations do not fit in %d bytes",
7180 howto->name, nbytes);
7181 else
7182 {
7183 register char * p = frag_more ((int) nbytes);
7184 int offset = nbytes - size;
7185
7186 fix_new_exp (frag_now, p - frag_now->fr_literal + offset, size,
7187 & exp, 0, reloc);
7188 }
7189 }
7190 else
7191 emit_expr (& exp, (unsigned int) nbytes);
7192 }
7193 while (*input_line_pointer++ == ',');
7194
7195 input_line_pointer--; /* Put terminator back into stream. */
7196 demand_empty_rest_of_line ();
7197 }
7198
7199 #endif /* OBJ_ELF */
GDB Binutils - Deliverables
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