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93f11b16 | 1 | /* TI PRU assembler. |
2571583a | 2 | Copyright (C) 2014-2017 Free Software Foundation, Inc. |
93f11b16 DD |
3 | Contributed by Dimitar Dimitrov <dimitar@dinux.eu> |
4 | Based on tc-nios2.c | |
5 | ||
6 | This file is part of GAS, the GNU Assembler. | |
7 | ||
8 | GAS is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GAS is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GAS; see the file COPYING. If not, write to the Free | |
20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA | |
21 | 02110-1301, USA. */ | |
22 | ||
23 | #include "as.h" | |
24 | #include "bfd_stdint.h" | |
25 | #include "opcode/pru.h" | |
26 | #include "elf/pru.h" | |
27 | #include "tc-pru.h" | |
28 | #include "bfd.h" | |
29 | #include "dwarf2dbg.h" | |
30 | #include "subsegs.h" | |
31 | #include "safe-ctype.h" | |
32 | #include "dw2gencfi.h" | |
33 | ||
34 | #ifndef OBJ_ELF | |
35 | /* We are not supporting any other target so we throw a compile time error. */ | |
36 | #error "OBJ_ELF not defined" | |
37 | #endif | |
38 | ||
39 | /* This array holds the chars that always start a comment. If the | |
40 | pre-processor is disabled, these aren't very useful. */ | |
41 | const char comment_chars[] = "#;"; | |
42 | ||
43 | /* This array holds the chars that only start a comment at the beginning of | |
44 | a line. If the line seems to have the form '# 123 filename' | |
45 | .line and .file directives will appear in the pre-processed output. */ | |
46 | /* Note that input_file.c hand checks for '#' at the beginning of the | |
47 | first line of the input file. This is because the compiler outputs | |
48 | #NO_APP at the beginning of its output. */ | |
49 | /* Also note that C style comments are always supported. */ | |
50 | const char line_comment_chars[] = "#;*"; | |
51 | ||
52 | /* This array holds machine specific line separator characters. */ | |
53 | const char line_separator_chars[] = ""; | |
54 | ||
55 | /* Chars that can be used to separate mant from exp in floating point nums. */ | |
56 | const char EXP_CHARS[] = "eE"; | |
57 | ||
58 | /* Chars that mean this number is a floating point constant. | |
59 | As in 0f12.456 | |
60 | or 0d1.2345e12 */ | |
61 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; | |
62 | ||
63 | /* Machine-dependent command-line options. */ | |
64 | ||
65 | struct pru_opt_s | |
66 | { | |
67 | /* -mno-link-relax / -mlink-relax: generate (or not) | |
68 | relocations for linker relaxation. */ | |
69 | bfd_boolean link_relax; | |
70 | ||
71 | /* -mno-warn-regname-label: do not output a warning that a label name | |
72 | matches a register name. */ | |
73 | bfd_boolean warn_regname_label; | |
74 | }; | |
75 | ||
76 | static struct pru_opt_s pru_opt = { TRUE, TRUE }; | |
77 | ||
78 | const char *md_shortopts = "r"; | |
79 | ||
80 | enum options | |
81 | { | |
82 | OPTION_LINK_RELAX = OPTION_MD_BASE + 1, | |
83 | OPTION_NO_LINK_RELAX, | |
84 | OPTION_NO_WARN_REGNAME_LABEL, | |
85 | }; | |
86 | ||
87 | struct option md_longopts[] = { | |
88 | { "mlink-relax", no_argument, NULL, OPTION_LINK_RELAX }, | |
89 | { "mno-link-relax", no_argument, NULL, OPTION_NO_LINK_RELAX }, | |
90 | { "mno-warn-regname-label", no_argument, NULL, | |
91 | OPTION_NO_WARN_REGNAME_LABEL }, | |
92 | { NULL, no_argument, NULL, 0 } | |
93 | }; | |
94 | ||
95 | size_t md_longopts_size = sizeof (md_longopts); | |
96 | ||
97 | typedef struct pru_insn_reloc | |
98 | { | |
99 | /* Any expression in the instruction is parsed into this field, | |
100 | which is passed to fix_new_exp () to generate a fixup. */ | |
101 | expressionS reloc_expression; | |
102 | ||
103 | /* The type of the relocation to be applied. */ | |
104 | bfd_reloc_code_real_type reloc_type; | |
105 | ||
106 | /* PC-relative. */ | |
107 | unsigned int reloc_pcrel; | |
108 | ||
109 | /* The next relocation to be applied to the instruction. */ | |
110 | struct pru_insn_reloc *reloc_next; | |
111 | } pru_insn_relocS; | |
112 | ||
113 | /* This struct is used to hold state when assembling instructions. */ | |
114 | typedef struct pru_insn_info | |
115 | { | |
116 | /* Assembled instruction. */ | |
117 | unsigned long insn_code; | |
118 | /* Used for assembling LDI32. */ | |
119 | unsigned long ldi32_imm32; | |
120 | ||
121 | /* Pointer to the relevant bit of the opcode table. */ | |
122 | const struct pru_opcode *insn_pru_opcode; | |
123 | /* After parsing ptrs to the tokens in the instruction fill this array | |
124 | it is terminated with a null pointer (hence the first +1). | |
125 | The second +1 is because in some parts of the code the opcode | |
126 | is not counted as a token, but still placed in this array. */ | |
127 | const char *insn_tokens[PRU_MAX_INSN_TOKENS + 1 + 1]; | |
128 | ||
129 | /* This holds information used to generate fixups | |
130 | and eventually relocations if it is not null. */ | |
131 | pru_insn_relocS *insn_reloc; | |
132 | } pru_insn_infoS; | |
133 | ||
134 | /* Opcode hash table. */ | |
135 | static struct hash_control *pru_opcode_hash = NULL; | |
136 | #define pru_opcode_lookup(NAME) \ | |
137 | ((struct pru_opcode *) hash_find (pru_opcode_hash, (NAME))) | |
138 | ||
139 | /* Register hash table. */ | |
140 | static struct hash_control *pru_reg_hash = NULL; | |
141 | #define pru_reg_lookup(NAME) \ | |
142 | ((struct pru_reg *) hash_find (pru_reg_hash, (NAME))) | |
143 | ||
144 | /* The known current alignment of the current section. */ | |
145 | static int pru_current_align; | |
146 | static segT pru_current_align_seg; | |
147 | ||
148 | static int pru_auto_align_on = 1; | |
149 | ||
150 | /* The last seen label in the current section. This is used to auto-align | |
151 | labels preceeding instructions. */ | |
152 | static symbolS *pru_last_label; | |
153 | ||
154 | \f | |
155 | /** Utility routines. */ | |
156 | /* Function md_chars_to_number takes the sequence of | |
157 | bytes in buf and returns the corresponding value | |
158 | in an int. n must be 1, 2, 4 or 8. */ | |
159 | static uint64_t | |
160 | md_chars_to_number (char *buf, int n) | |
161 | { | |
162 | int i; | |
163 | uint64_t val; | |
164 | ||
165 | gas_assert (n == 1 || n == 2 || n == 4 || n == 8); | |
166 | ||
167 | val = 0; | |
168 | for (i = 0; i < n; ++i) | |
169 | val = val | ((buf[i] & 0xff) << 8 * i); | |
170 | return val; | |
171 | } | |
172 | ||
173 | ||
174 | /* This function turns a C long int, short int or char | |
175 | into the series of bytes that represent the number | |
176 | on the target machine. */ | |
177 | void | |
ddb2c6fd | 178 | md_number_to_chars (char *buf, valueT val, int n) |
93f11b16 DD |
179 | { |
180 | gas_assert (n == 1 || n == 2 || n == 4 || n == 8); | |
181 | number_to_chars_littleendian (buf, val, n); | |
182 | } | |
183 | ||
184 | /* Turn a string in input_line_pointer into a floating point constant | |
185 | of type TYPE, and store the appropriate bytes in *LITP. The number | |
186 | of LITTLENUMS emitted is stored in *SIZEP. An error message is | |
187 | returned, or NULL on OK. */ | |
188 | const char * | |
189 | md_atof (int type, char *litP, int *sizeP) | |
190 | { | |
191 | return ieee_md_atof (type, litP, sizeP, FALSE); | |
192 | } | |
193 | ||
194 | /* Return true if STR starts with PREFIX, which should be a string literal. */ | |
195 | #define strprefix(STR, PREFIX) \ | |
196 | (strncmp ((STR), PREFIX, strlen (PREFIX)) == 0) | |
197 | ||
198 | /* nop fill pattern for text section. */ | |
199 | static char const nop[4] = { 0xe0, 0xe0, 0xe0, 0x12 }; | |
200 | ||
201 | /* Handles all machine-dependent alignment needs. */ | |
202 | static void | |
203 | pru_align (int log_size, const char *pfill, symbolS *label) | |
204 | { | |
205 | int align; | |
206 | long max_alignment = 15; | |
207 | ||
208 | /* The front end is prone to changing segments out from under us | |
209 | temporarily when -g is in effect. */ | |
210 | int switched_seg_p = (pru_current_align_seg != now_seg); | |
211 | ||
212 | align = log_size; | |
213 | if (align > max_alignment) | |
214 | { | |
215 | align = max_alignment; | |
216 | as_bad (_("Alignment too large: %d assumed"), align); | |
217 | } | |
218 | else if (align < 0) | |
219 | { | |
220 | as_warn (_("Alignment negative: 0 assumed")); | |
221 | align = 0; | |
222 | } | |
223 | ||
224 | if (align != 0) | |
225 | { | |
226 | if (subseg_text_p (now_seg) && align >= 2) | |
227 | { | |
228 | /* First, make sure we're on a four-byte boundary, in case | |
229 | someone has been putting .byte values the text section. */ | |
230 | if (pru_current_align < 2 || switched_seg_p) | |
231 | frag_align (2, 0, 0); | |
232 | ||
233 | /* Now fill in the alignment pattern. */ | |
234 | if (pfill != NULL) | |
235 | frag_align_pattern (align, pfill, sizeof nop, 0); | |
236 | else | |
237 | frag_align (align, 0, 0); | |
238 | } | |
239 | else | |
240 | frag_align (align, 0, 0); | |
241 | ||
242 | if (!switched_seg_p) | |
243 | pru_current_align = align; | |
244 | ||
245 | /* If the last label was in a different section we can't align it. */ | |
246 | if (label != NULL && !switched_seg_p) | |
247 | { | |
248 | symbolS *sym; | |
249 | int label_seen = FALSE; | |
250 | struct frag *old_frag; | |
251 | valueT old_value; | |
252 | valueT new_value; | |
253 | ||
254 | gas_assert (S_GET_SEGMENT (label) == now_seg); | |
255 | ||
256 | old_frag = symbol_get_frag (label); | |
257 | old_value = S_GET_VALUE (label); | |
258 | new_value = (valueT) frag_now_fix (); | |
259 | ||
260 | /* It is possible to have more than one label at a particular | |
261 | address, especially if debugging is enabled, so we must | |
262 | take care to adjust all the labels at this address in this | |
263 | fragment. To save time we search from the end of the symbol | |
264 | list, backwards, since the symbols we are interested in are | |
265 | almost certainly the ones that were most recently added. | |
266 | Also to save time we stop searching once we have seen at least | |
267 | one matching label, and we encounter a label that is no longer | |
268 | in the target fragment. Note, this search is guaranteed to | |
269 | find at least one match when sym == label, so no special case | |
270 | code is necessary. */ | |
271 | for (sym = symbol_lastP; sym != NULL; sym = symbol_previous (sym)) | |
272 | if (symbol_get_frag (sym) == old_frag | |
273 | && S_GET_VALUE (sym) == old_value) | |
274 | { | |
275 | label_seen = TRUE; | |
276 | symbol_set_frag (sym, frag_now); | |
277 | S_SET_VALUE (sym, new_value); | |
278 | } | |
279 | else if (label_seen && symbol_get_frag (sym) != old_frag) | |
280 | break; | |
281 | } | |
282 | record_alignment (now_seg, align); | |
283 | } | |
284 | } | |
285 | ||
286 | \f | |
287 | /** Support for self-check mode. */ | |
288 | ||
289 | /* Mode of the assembler. */ | |
290 | typedef enum | |
291 | { | |
292 | PRU_MODE_ASSEMBLE, /* Ordinary operation. */ | |
293 | PRU_MODE_TEST /* Hidden mode used for self testing. */ | |
294 | } PRU_MODE; | |
295 | ||
296 | static PRU_MODE pru_mode = PRU_MODE_ASSEMBLE; | |
297 | ||
298 | /* This function is used to in self-checking mode | |
299 | to check the assembled instruction | |
300 | opcode should be the assembled opcode, and exp_opcode | |
301 | the parsed string representing the expected opcode. */ | |
302 | static void | |
303 | pru_check_assembly (unsigned int opcode, const char *exp_opcode) | |
304 | { | |
305 | if (pru_mode == PRU_MODE_TEST) | |
306 | { | |
307 | if (exp_opcode == NULL) | |
308 | as_bad (_("expecting opcode string in self test mode")); | |
309 | else if (opcode != strtoul (exp_opcode, NULL, 16)) | |
310 | as_bad (_("assembly 0x%08x, expected %s"), opcode, exp_opcode); | |
311 | } | |
312 | } | |
313 | ||
314 | \f | |
315 | /** Support for machine-dependent assembler directives. */ | |
316 | /* Handle the .align pseudo-op. This aligns to a power of two. It | |
317 | also adjusts any current instruction label. We treat this the same | |
318 | way the MIPS port does: .align 0 turns off auto alignment. */ | |
319 | static void | |
320 | s_pru_align (int ignore ATTRIBUTE_UNUSED) | |
321 | { | |
322 | int align; | |
323 | char fill; | |
324 | const char *pfill = NULL; | |
325 | long max_alignment = 15; | |
326 | ||
327 | align = get_absolute_expression (); | |
328 | if (align > max_alignment) | |
329 | { | |
330 | align = max_alignment; | |
331 | as_bad (_("Alignment too large: %d assumed"), align); | |
332 | } | |
333 | else if (align < 0) | |
334 | { | |
335 | as_warn (_("Alignment negative: 0 assumed")); | |
336 | align = 0; | |
337 | } | |
338 | ||
339 | if (*input_line_pointer == ',') | |
340 | { | |
341 | input_line_pointer++; | |
342 | fill = get_absolute_expression (); | |
343 | pfill = (const char *) &fill; | |
344 | } | |
345 | else if (subseg_text_p (now_seg)) | |
346 | pfill = (const char *) &nop; | |
347 | else | |
348 | { | |
349 | pfill = NULL; | |
350 | pru_last_label = NULL; | |
351 | } | |
352 | ||
353 | if (align != 0) | |
354 | { | |
355 | pru_auto_align_on = 1; | |
356 | pru_align (align, pfill, pru_last_label); | |
357 | pru_last_label = NULL; | |
358 | } | |
359 | else | |
360 | pru_auto_align_on = 0; | |
361 | ||
362 | demand_empty_rest_of_line (); | |
363 | } | |
364 | ||
365 | /* Handle the .text pseudo-op. This is like the usual one, but it | |
366 | clears the saved last label and resets known alignment. */ | |
367 | static void | |
368 | s_pru_text (int i) | |
369 | { | |
370 | s_text (i); | |
371 | pru_last_label = NULL; | |
372 | pru_current_align = 0; | |
373 | pru_current_align_seg = now_seg; | |
374 | } | |
375 | ||
376 | /* Handle the .data pseudo-op. This is like the usual one, but it | |
377 | clears the saved last label and resets known alignment. */ | |
378 | static void | |
379 | s_pru_data (int i) | |
380 | { | |
381 | s_data (i); | |
382 | pru_last_label = NULL; | |
383 | pru_current_align = 0; | |
384 | pru_current_align_seg = now_seg; | |
385 | } | |
386 | ||
387 | /* Handle the .section pseudo-op. This is like the usual one, but it | |
388 | clears the saved last label and resets known alignment. */ | |
389 | static void | |
390 | s_pru_section (int ignore) | |
391 | { | |
392 | obj_elf_section (ignore); | |
393 | pru_last_label = NULL; | |
394 | pru_current_align = 0; | |
395 | pru_current_align_seg = now_seg; | |
396 | } | |
397 | ||
398 | /* Explicitly unaligned cons. */ | |
399 | static void | |
400 | s_pru_ucons (int nbytes) | |
401 | { | |
402 | int hold; | |
403 | hold = pru_auto_align_on; | |
404 | pru_auto_align_on = 0; | |
405 | cons (nbytes); | |
406 | pru_auto_align_on = hold; | |
407 | } | |
408 | ||
409 | /* .set sets assembler options. */ | |
410 | static void | |
411 | s_pru_set (int equiv) | |
412 | { | |
413 | char *save = input_line_pointer; | |
414 | char *directive; | |
415 | char delim = get_symbol_name (&directive); | |
416 | char *endline = input_line_pointer; | |
417 | ||
418 | (void) restore_line_pointer (delim); | |
419 | ||
420 | /* We only want to handle ".set XXX" if the | |
421 | user has tried ".set XXX, YYY" they are not | |
422 | trying a directive. This prevents | |
423 | us from polluting the name space. */ | |
424 | SKIP_WHITESPACE (); | |
425 | if (is_end_of_line[(unsigned char) *input_line_pointer]) | |
426 | { | |
427 | bfd_boolean done = TRUE; | |
428 | *endline = 0; | |
429 | ||
430 | if (!strcmp (directive, "no_warn_regname_label")) | |
431 | pru_opt.warn_regname_label = FALSE; | |
432 | else | |
433 | done = FALSE; | |
434 | ||
435 | if (done) | |
436 | { | |
437 | *endline = delim; | |
438 | demand_empty_rest_of_line (); | |
439 | return; | |
440 | } | |
441 | } | |
442 | ||
443 | /* If we fall through to here, either we have ".set XXX, YYY" | |
444 | or we have ".set XXX" where XXX is unknown or we have | |
445 | a syntax error. */ | |
446 | input_line_pointer = save; | |
447 | s_set (equiv); | |
448 | } | |
449 | ||
450 | /* Machine-dependent assembler directives. | |
451 | Format of each entry is: | |
452 | { "directive", handler_func, param } */ | |
453 | const pseudo_typeS md_pseudo_table[] = { | |
454 | {"align", s_pru_align, 0}, | |
455 | {"text", s_pru_text, 0}, | |
456 | {"data", s_pru_data, 0}, | |
457 | {"section", s_pru_section, 0}, | |
458 | {"section.s", s_pru_section, 0}, | |
459 | {"sect", s_pru_section, 0}, | |
460 | {"sect.s", s_pru_section, 0}, | |
461 | /* .dword and .half are included for compatibility with MIPS. */ | |
462 | {"dword", cons, 8}, | |
463 | {"half", cons, 2}, | |
464 | /* PRU native word size is 4 bytes, so we override | |
465 | the GAS default of 2. */ | |
466 | {"word", cons, 4}, | |
467 | /* Explicitly unaligned directives. */ | |
468 | {"2byte", s_pru_ucons, 2}, | |
469 | {"4byte", s_pru_ucons, 4}, | |
470 | {"8byte", s_pru_ucons, 8}, | |
471 | {"16byte", s_pru_ucons, 16}, | |
472 | {"set", s_pru_set, 0}, | |
473 | {NULL, NULL, 0} | |
474 | }; | |
475 | ||
476 | \f | |
477 | int | |
478 | md_estimate_size_before_relax (fragS *fragp ATTRIBUTE_UNUSED, | |
479 | asection *seg ATTRIBUTE_UNUSED) | |
480 | { | |
481 | abort (); | |
482 | return 0; | |
483 | } | |
484 | ||
485 | void | |
486 | md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED, | |
487 | fragS *fragp ATTRIBUTE_UNUSED) | |
488 | { | |
489 | abort (); | |
490 | } | |
491 | ||
492 | \f | |
493 | static bfd_boolean | |
494 | relaxable_section (asection *sec) | |
495 | { | |
496 | return ((sec->flags & SEC_DEBUGGING) == 0 | |
497 | && (sec->flags & SEC_CODE) != 0 | |
498 | && (sec->flags & SEC_ALLOC) != 0); | |
499 | } | |
500 | ||
501 | /* Does whatever the xtensa port does. */ | |
502 | int | |
503 | pru_validate_fix_sub (fixS *fix) | |
504 | { | |
505 | segT add_symbol_segment, sub_symbol_segment; | |
506 | ||
507 | /* The difference of two symbols should be resolved by the assembler when | |
508 | linkrelax is not set. If the linker may relax the section containing | |
509 | the symbols, then an Xtensa DIFF relocation must be generated so that | |
510 | the linker knows to adjust the difference value. */ | |
511 | if (!linkrelax || fix->fx_addsy == NULL) | |
512 | return 0; | |
513 | ||
514 | /* Make sure both symbols are in the same segment, and that segment is | |
515 | "normal" and relaxable. If the segment is not "normal", then the | |
516 | fix is not valid. If the segment is not "relaxable", then the fix | |
517 | should have been handled earlier. */ | |
518 | add_symbol_segment = S_GET_SEGMENT (fix->fx_addsy); | |
519 | if (! SEG_NORMAL (add_symbol_segment) | |
520 | || ! relaxable_section (add_symbol_segment)) | |
521 | return 0; | |
522 | ||
523 | sub_symbol_segment = S_GET_SEGMENT (fix->fx_subsy); | |
524 | return (sub_symbol_segment == add_symbol_segment); | |
525 | } | |
526 | ||
527 | /* TC_FORCE_RELOCATION hook. */ | |
528 | ||
529 | /* If linkrelax is turned on, and the symbol to relocate | |
530 | against is in a relaxable segment, don't compute the value - | |
531 | generate a relocation instead. */ | |
532 | int | |
533 | pru_force_relocation (fixS *fix) | |
534 | { | |
535 | if (linkrelax && fix->fx_addsy | |
536 | && relaxable_section (S_GET_SEGMENT (fix->fx_addsy))) | |
537 | return 1; | |
538 | ||
539 | return generic_force_reloc (fix); | |
540 | } | |
541 | ||
542 | ||
543 | \f | |
544 | /** Fixups and overflow checking. */ | |
545 | ||
546 | /* Check a fixup for overflow. */ | |
547 | static bfd_reloc_status_type | |
548 | pru_check_overflow (valueT fixup, reloc_howto_type *howto) | |
549 | { | |
550 | bfd_reloc_status_type ret; | |
551 | ||
552 | ret = bfd_check_overflow (howto->complain_on_overflow, | |
553 | howto->bitsize, | |
554 | howto->rightshift, | |
555 | bfd_get_reloc_size (howto) * 8, | |
556 | fixup); | |
557 | ||
558 | return ret; | |
559 | } | |
560 | ||
561 | /* Emit diagnostic for fixup overflow. */ | |
562 | static void | |
563 | pru_diagnose_overflow (valueT fixup, reloc_howto_type *howto, | |
564 | fixS *fixP, valueT value) | |
565 | { | |
566 | if (fixP->fx_r_type == BFD_RELOC_8 | |
567 | || fixP->fx_r_type == BFD_RELOC_16 | |
568 | || fixP->fx_r_type == BFD_RELOC_32) | |
569 | /* These relocs are against data, not instructions. */ | |
570 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
571 | _("immediate value 0x%x truncated to 0x%x"), | |
572 | (unsigned int) fixup, | |
573 | (unsigned int) (~(~(valueT) 0 << howto->bitsize) & fixup)); | |
574 | else | |
575 | { | |
576 | /* What opcode is the instruction? This will determine | |
577 | whether we check for overflow in immediate values | |
578 | and what error message we get. */ | |
579 | const struct pru_opcode *opcode; | |
580 | enum overflow_type overflow_msg_type; | |
581 | unsigned int range_min; | |
582 | unsigned int range_max; | |
583 | unsigned int address; | |
584 | gas_assert (fixP->fx_size == 4); | |
585 | opcode = pru_find_opcode (value); | |
586 | gas_assert (opcode); | |
587 | overflow_msg_type = opcode->overflow_msg; | |
588 | switch (overflow_msg_type) | |
589 | { | |
590 | case call_target_overflow: | |
591 | range_min | |
592 | = ((fixP->fx_frag->fr_address + fixP->fx_where) & 0xf0000000); | |
593 | range_max = range_min + 0x0fffffff; | |
594 | address = fixup | range_min; | |
595 | ||
596 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
597 | _("call target address 0x%08x out of range 0x%08x to 0x%08x"), | |
598 | address, range_min, range_max); | |
599 | break; | |
600 | case qbranch_target_overflow: | |
601 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
602 | _("quick branch offset %d out of range %d to %d"), | |
603 | (int)fixup, -((1<<9) * 4), (1 << 9) * 4); | |
604 | break; | |
605 | case address_offset_overflow: | |
606 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
607 | _("%s offset %d out of range %d to %d"), | |
608 | opcode->name, (int)fixup, -32768, 32767); | |
609 | break; | |
610 | case signed_immed16_overflow: | |
611 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
612 | _("immediate value %d out of range %d to %d"), | |
613 | (int)fixup, -32768, 32767); | |
614 | break; | |
615 | case unsigned_immed32_overflow: | |
616 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
617 | _("immediate value %llu out of range %u to %lu"), | |
618 | (unsigned long long)fixup, 0, 0xfffffffflu); | |
619 | break; | |
620 | case unsigned_immed16_overflow: | |
621 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
622 | _("immediate value %u out of range %u to %u"), | |
623 | (unsigned int)fixup, 0, 65535); | |
624 | break; | |
625 | case unsigned_immed5_overflow: | |
626 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
627 | _("immediate value %u out of range %u to %u"), | |
628 | (unsigned int)fixup, 0, 31); | |
629 | break; | |
630 | default: | |
631 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
632 | _("overflow in immediate argument")); | |
633 | break; | |
634 | } | |
635 | } | |
636 | } | |
637 | ||
638 | /* Apply a fixup to the object file. */ | |
639 | void | |
640 | md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) | |
641 | { | |
642 | unsigned char *where; | |
643 | valueT value = *valP; | |
644 | long n; | |
645 | ||
646 | /* Assert that the fixup is one we can handle. */ | |
647 | gas_assert (fixP != NULL && valP != NULL | |
648 | && (fixP->fx_r_type == BFD_RELOC_8 | |
649 | || fixP->fx_r_type == BFD_RELOC_16 | |
650 | || fixP->fx_r_type == BFD_RELOC_32 | |
651 | || fixP->fx_r_type == BFD_RELOC_64 | |
652 | || fixP->fx_r_type == BFD_RELOC_PRU_LDI32 | |
653 | || fixP->fx_r_type == BFD_RELOC_PRU_U16 | |
654 | || fixP->fx_r_type == BFD_RELOC_PRU_U16_PMEMIMM | |
655 | || fixP->fx_r_type == BFD_RELOC_PRU_S10_PCREL | |
656 | || fixP->fx_r_type == BFD_RELOC_PRU_U8_PCREL | |
657 | || fixP->fx_r_type == BFD_RELOC_PRU_32_PMEM | |
658 | || fixP->fx_r_type == BFD_RELOC_PRU_16_PMEM | |
659 | /* Add other relocs here as we generate them. */ | |
660 | )); | |
661 | ||
662 | if (fixP->fx_r_type == BFD_RELOC_64) | |
663 | { | |
664 | /* We may reach here due to .8byte directives, but we never output | |
665 | BFD_RELOC_64; it must be resolved. */ | |
666 | if (fixP->fx_addsy != NULL) | |
667 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
668 | _("cannot create 64-bit relocation")); | |
669 | else | |
670 | { | |
671 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, | |
672 | *valP, 8); | |
673 | fixP->fx_done = 1; | |
674 | } | |
675 | return; | |
676 | } | |
677 | ||
678 | /* gas_assert (had_errors () || !fixP->fx_subsy); */ | |
679 | ||
680 | /* In general, fix instructions with immediate | |
681 | constants. But leave LDI32 for the linker, | |
682 | which is prepared to shorten insns. */ | |
683 | if (fixP->fx_addsy == (symbolS *) NULL | |
684 | && fixP->fx_r_type != BFD_RELOC_PRU_LDI32) | |
685 | fixP->fx_done = 1; | |
686 | ||
687 | else if (fixP->fx_pcrel) | |
688 | { | |
689 | segT s = S_GET_SEGMENT (fixP->fx_addsy); | |
690 | ||
691 | if (s == seg || s == absolute_section) | |
692 | { | |
693 | /* Blindly copied from AVR, but I don't understand why | |
694 | this is needed in the first place. Fail hard to catch | |
695 | when this curious code snippet is utilized. */ | |
696 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
697 | _("unexpected PC relative expression")); | |
698 | value += S_GET_VALUE (fixP->fx_addsy); | |
699 | fixP->fx_done = 1; | |
700 | } | |
701 | } | |
702 | else if (linkrelax && fixP->fx_subsy) | |
703 | { | |
704 | /* For a subtraction relocation expression, generate one | |
705 | of the DIFF relocs, with the value being the difference. | |
706 | Note that a sym1 - sym2 expression is adjusted into a | |
707 | section_start_sym + sym4_offset_from_section_start - sym1 | |
708 | expression. fixP->fx_addsy holds the section start symbol, | |
709 | fixP->fx_offset holds sym2's offset, and fixP->fx_subsy | |
710 | holds sym1. Calculate the current difference and write value, | |
711 | but leave fx_offset as is - during relaxation, | |
712 | fx_offset - value gives sym1's value. */ | |
713 | ||
714 | offsetT diffval; /* valueT is unsigned, so use offsetT. */ | |
715 | ||
716 | diffval = S_GET_VALUE (fixP->fx_addsy) | |
717 | + fixP->fx_offset - S_GET_VALUE (fixP->fx_subsy); | |
718 | ||
719 | switch (fixP->fx_r_type) | |
720 | { | |
721 | case BFD_RELOC_8: | |
722 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF8; | |
723 | break; | |
724 | case BFD_RELOC_16: | |
725 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF16; | |
726 | break; | |
727 | case BFD_RELOC_32: | |
728 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF32; | |
729 | break; | |
730 | case BFD_RELOC_PRU_16_PMEM: | |
731 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF16_PMEM; | |
732 | if (diffval % 4) | |
733 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
734 | _("residual low bits in pmem diff relocation")); | |
735 | diffval /= 4; | |
736 | break; | |
737 | case BFD_RELOC_PRU_32_PMEM: | |
738 | fixP->fx_r_type = BFD_RELOC_PRU_GNU_DIFF32_PMEM; | |
739 | if (diffval % 4) | |
740 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
741 | _("residual low bits in pmem diff relocation")); | |
742 | diffval /= 4; | |
743 | break; | |
744 | default: | |
745 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
746 | _("expression too complex")); | |
747 | break; | |
748 | } | |
749 | ||
750 | value = *valP = diffval; | |
751 | ||
752 | fixP->fx_subsy = NULL; | |
753 | } | |
754 | /* We don't actually support subtracting a symbol. */ | |
755 | if (fixP->fx_subsy != (symbolS *) NULL) | |
756 | as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex")); | |
757 | ||
758 | /* For the DIFF relocs, write the value into the object file while still | |
759 | keeping fx_done FALSE, as both the difference (recorded in the object file) | |
760 | and the sym offset (part of fixP) are needed at link relax time. */ | |
761 | where = (unsigned char *) fixP->fx_frag->fr_literal + fixP->fx_where; | |
762 | switch (fixP->fx_r_type) | |
763 | { | |
764 | case BFD_RELOC_PRU_GNU_DIFF8: | |
765 | *where = value; | |
766 | break; | |
767 | case BFD_RELOC_PRU_GNU_DIFF16: | |
768 | case BFD_RELOC_PRU_GNU_DIFF16_PMEM: | |
769 | bfd_putl16 ((bfd_vma) value, where); | |
770 | break; | |
771 | case BFD_RELOC_PRU_GNU_DIFF32: | |
772 | case BFD_RELOC_PRU_GNU_DIFF32_PMEM: | |
773 | bfd_putl32 ((bfd_vma) value, where); | |
774 | break; | |
775 | default: | |
776 | break; | |
777 | } | |
778 | ||
779 | if (fixP->fx_done) | |
780 | /* Fully resolved fixup. */ | |
781 | { | |
782 | reloc_howto_type *howto | |
783 | = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); | |
784 | ||
785 | if (howto == NULL) | |
786 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
787 | _("relocation is not supported")); | |
788 | else | |
789 | { | |
790 | valueT fixup = value; | |
791 | uint64_t insn; | |
792 | char *buf; | |
793 | ||
794 | /* Get the instruction or data to be fixed up. */ | |
795 | buf = fixP->fx_frag->fr_literal + fixP->fx_where; | |
796 | insn = md_chars_to_number (buf, fixP->fx_size); | |
797 | ||
798 | /* Check for overflow, emitting a diagnostic if necessary. */ | |
799 | if (pru_check_overflow (fixup, howto) != bfd_reloc_ok) | |
800 | pru_diagnose_overflow (fixup, howto, fixP, insn); | |
801 | ||
802 | /* Apply the right shift. */ | |
803 | fixup = ((offsetT)fixup) >> howto->rightshift; | |
804 | ||
805 | /* Truncate the fixup to right size. */ | |
806 | n = sizeof (fixup) * 8 - howto->bitsize; | |
807 | fixup = (fixup << n) >> n; | |
808 | ||
809 | /* Fix up the instruction. Non-contiguous bitfields need | |
810 | special handling. */ | |
ddb2c6fd | 811 | if (fixP->fx_r_type == BFD_RELOC_PRU_LDI32) |
93f11b16 DD |
812 | { |
813 | /* As the only 64-bit "insn", LDI32 needs special handling. */ | |
814 | uint32_t insn1 = insn & 0xffffffff; | |
815 | uint32_t insn2 = insn >> 32; | |
816 | SET_INSN_FIELD (IMM16, insn1, fixup & 0xffff); | |
817 | SET_INSN_FIELD (IMM16, insn2, fixup >> 16); | |
ddb2c6fd DD |
818 | |
819 | md_number_to_chars (buf, insn1, 4); | |
820 | md_number_to_chars (buf + 4, insn2, 4); | |
93f11b16 DD |
821 | } |
822 | else | |
ddb2c6fd DD |
823 | { |
824 | if (fixP->fx_r_type == BFD_RELOC_PRU_S10_PCREL) | |
825 | SET_BROFF_URAW (insn, fixup); | |
826 | else | |
827 | insn = (insn & ~howto->dst_mask) | (fixup << howto->bitpos); | |
828 | md_number_to_chars (buf, insn, fixP->fx_size); | |
829 | } | |
93f11b16 DD |
830 | } |
831 | ||
832 | fixP->fx_done = 1; | |
833 | } | |
834 | ||
835 | if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) | |
836 | { | |
837 | fixP->fx_done = 0; | |
838 | if (fixP->fx_addsy | |
839 | && !S_IS_DEFINED (fixP->fx_addsy) && !S_IS_WEAK (fixP->fx_addsy)) | |
840 | S_SET_WEAK (fixP->fx_addsy); | |
841 | } | |
842 | else if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) | |
843 | fixP->fx_done = 0; | |
844 | } | |
845 | ||
846 | ||
847 | \f | |
848 | /** Instruction parsing support. */ | |
849 | ||
850 | /* Creates a new pru_insn_relocS and returns a pointer to it. */ | |
851 | static pru_insn_relocS * | |
852 | pru_insn_reloc_new (bfd_reloc_code_real_type reloc_type, unsigned int pcrel) | |
853 | { | |
854 | pru_insn_relocS *retval; | |
855 | retval = XNEW (pru_insn_relocS); | |
856 | if (retval == NULL) | |
857 | { | |
858 | as_bad (_("can't create relocation")); | |
859 | abort (); | |
860 | } | |
861 | ||
862 | /* Fill out the fields with default values. */ | |
863 | retval->reloc_next = NULL; | |
864 | retval->reloc_type = reloc_type; | |
865 | retval->reloc_pcrel = pcrel; | |
866 | return retval; | |
867 | } | |
868 | ||
869 | /* Frees up memory previously allocated by pru_insn_reloc_new (). */ | |
870 | static void | |
871 | pru_insn_reloc_destroy (pru_insn_relocS *reloc) | |
872 | { | |
873 | pru_insn_relocS *next; | |
874 | ||
875 | while (reloc) | |
876 | { | |
877 | next = reloc->reloc_next; | |
878 | free (reloc); | |
879 | reloc = next; | |
880 | } | |
881 | } | |
882 | ||
883 | /* The various pru_assemble_* functions call this | |
884 | function to generate an expression from a string representing an expression. | |
885 | It then tries to evaluate the expression, and if it can, returns its value. | |
886 | If not, it creates a new pru_insn_relocS and stores the expression and | |
887 | reloc_type for future use. */ | |
888 | static unsigned long | |
889 | pru_assemble_expression (const char *exprstr, | |
890 | pru_insn_infoS *insn, | |
891 | pru_insn_relocS *prev_reloc, | |
892 | bfd_reloc_code_real_type reloc_type, | |
893 | unsigned int pcrel) | |
894 | { | |
895 | expressionS *ep; | |
896 | pru_insn_relocS *reloc; | |
897 | char *saved_line_ptr; | |
898 | unsigned short value; | |
899 | ||
900 | gas_assert (exprstr != NULL); | |
901 | gas_assert (insn != NULL); | |
902 | ||
903 | /* We use this blank keyword to distinguish register from | |
904 | label operands. */ | |
905 | if (strstr (exprstr, "%label") != NULL) | |
906 | { | |
907 | exprstr += strlen ("%label") + 1; | |
908 | } | |
909 | ||
910 | /* Check for pmem relocation operator. | |
911 | Change the relocation type and advance the ptr to the start of | |
912 | the expression proper. */ | |
913 | if (strstr (exprstr, "%pmem") != NULL) | |
914 | { | |
915 | reloc_type = BFD_RELOC_PRU_U16_PMEMIMM; | |
916 | exprstr += strlen ("%pmem") + 1; | |
917 | } | |
918 | ||
919 | /* We potentially have a relocation. */ | |
920 | reloc = pru_insn_reloc_new (reloc_type, pcrel); | |
921 | if (prev_reloc != NULL) | |
922 | prev_reloc->reloc_next = reloc; | |
923 | else | |
924 | insn->insn_reloc = reloc; | |
925 | ||
926 | /* Parse the expression string. */ | |
927 | ep = &reloc->reloc_expression; | |
928 | saved_line_ptr = input_line_pointer; | |
929 | input_line_pointer = (char *) exprstr; | |
930 | SKIP_WHITESPACE (); | |
931 | expression (ep); | |
932 | SKIP_WHITESPACE (); | |
933 | if (*input_line_pointer) | |
934 | as_bad (_("trailing garbage after expression: %s"), input_line_pointer); | |
935 | input_line_pointer = saved_line_ptr; | |
936 | ||
937 | ||
938 | if (ep->X_op == O_illegal || ep->X_op == O_absent) | |
939 | as_bad (_("expected expression, got %s"), exprstr); | |
940 | ||
941 | /* This is redundant as the fixup will put this into | |
942 | the instruction, but it is included here so that | |
943 | self-test mode (-r) works. */ | |
944 | value = 0; | |
945 | if (pru_mode == PRU_MODE_TEST && ep->X_op == O_constant) | |
946 | value = ep->X_add_number; | |
947 | ||
948 | return (unsigned long) value; | |
949 | } | |
950 | ||
951 | /* Try to parse a non-relocatable expression. */ | |
952 | static unsigned long | |
953 | pru_assemble_noreloc_expression (const char *exprstr) | |
954 | { | |
955 | expressionS exp; | |
956 | char *saved_line_ptr; | |
957 | unsigned long val; | |
958 | ||
959 | gas_assert (exprstr != NULL); | |
960 | ||
961 | saved_line_ptr = input_line_pointer; | |
962 | input_line_pointer = (char *) exprstr; | |
963 | SKIP_WHITESPACE (); | |
964 | expression (&exp); | |
965 | SKIP_WHITESPACE (); | |
966 | if (*input_line_pointer) | |
967 | as_bad (_("trailing garbage after expression: %s"), input_line_pointer); | |
968 | input_line_pointer = saved_line_ptr; | |
969 | ||
970 | val = 0; | |
971 | if (exp.X_op != O_constant) | |
972 | as_bad (_("expected constant expression, got %s"), exprstr); | |
973 | else | |
974 | val = exp.X_add_number; | |
975 | ||
976 | return val; | |
977 | } | |
978 | ||
979 | /* Argument assemble functions. | |
980 | All take an instruction argument string, and a pointer | |
981 | to an instruction opcode. Upon return the insn_opcode | |
982 | has the relevant fields filled in to represent the arg | |
983 | string. The return value is NULL if successful, or | |
984 | an error message if an error was detected. */ | |
985 | ||
986 | static void | |
987 | pru_assemble_arg_d (pru_insn_infoS *insn_info, const char *argstr) | |
988 | { | |
989 | struct pru_reg *dst = pru_reg_lookup (argstr); | |
990 | ||
991 | if (dst == NULL) | |
992 | as_bad (_("unknown register %s"), argstr); | |
993 | else | |
994 | { | |
995 | SET_INSN_FIELD (RD, insn_info->insn_code, dst->index); | |
996 | SET_INSN_FIELD (RDSEL, insn_info->insn_code, dst->regsel); | |
997 | } | |
998 | } | |
999 | ||
1000 | static void | |
1001 | pru_assemble_arg_D (pru_insn_infoS *insn_info, const char *argstr) | |
1002 | { | |
1003 | struct pru_reg *dst; | |
1004 | ||
1005 | /* The leading & before an address register is optional. */ | |
1006 | if (*argstr == '&') | |
1007 | argstr++; | |
1008 | ||
1009 | dst = pru_reg_lookup (argstr); | |
1010 | ||
1011 | if (dst == NULL) | |
1012 | as_bad (_("unknown register %s"), argstr); | |
1013 | else | |
1014 | { | |
1015 | unsigned long rxb = 0; | |
1016 | ||
1017 | switch (dst->regsel) | |
1018 | { | |
1019 | case RSEL_31_0: rxb = 0; break; /* whole register defaults to .b0 */ | |
1020 | case RSEL_7_0: rxb = 0; break; | |
1021 | case RSEL_15_8: rxb = 1; break; | |
1022 | case RSEL_23_16: rxb = 2; break; | |
1023 | case RSEL_31_24: rxb = 3; break; | |
1024 | default: | |
1025 | as_bad (_("data transfer register cannot be halfword")); | |
1026 | } | |
1027 | ||
1028 | SET_INSN_FIELD (RD, insn_info->insn_code, dst->index); | |
1029 | SET_INSN_FIELD (RDB, insn_info->insn_code, rxb); | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | static void | |
1034 | pru_assemble_arg_R (pru_insn_infoS *insn_info, const char *argstr) | |
1035 | { | |
1036 | struct pru_reg *dst = pru_reg_lookup (argstr); | |
1037 | ||
1038 | if (dst == NULL) | |
1039 | as_bad (_("unknown register %s"), argstr); | |
1040 | else | |
1041 | { | |
1042 | if (dst->regsel != RSEL_31_0) | |
1043 | { | |
1044 | as_bad (_("destination register must be full-word")); | |
1045 | } | |
1046 | ||
1047 | SET_INSN_FIELD (RD, insn_info->insn_code, dst->index); | |
1048 | SET_INSN_FIELD (RDSEL, insn_info->insn_code, dst->regsel); | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | static void | |
1053 | pru_assemble_arg_s (pru_insn_infoS *insn_info, const char *argstr) | |
1054 | { | |
1055 | struct pru_reg *src1 = pru_reg_lookup (argstr); | |
1056 | ||
1057 | if (src1 == NULL) | |
1058 | as_bad (_("unknown register %s"), argstr); | |
1059 | else | |
1060 | { | |
1061 | SET_INSN_FIELD (RS1, insn_info->insn_code, src1->index); | |
1062 | SET_INSN_FIELD (RS1SEL, insn_info->insn_code, src1->regsel); | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | static void | |
1067 | pru_assemble_arg_S (pru_insn_infoS *insn_info, const char *argstr) | |
1068 | { | |
1069 | struct pru_reg *src1 = pru_reg_lookup (argstr); | |
1070 | ||
1071 | if (src1 == NULL) | |
1072 | as_bad (_("unknown register %s"), argstr); | |
1073 | else | |
1074 | { | |
1075 | if (src1->regsel != RSEL_31_0) | |
1076 | as_bad (_("cannot use partial register %s for addressing"), argstr); | |
1077 | SET_INSN_FIELD (RS1, insn_info->insn_code, src1->index); | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | static void | |
1082 | pru_assemble_arg_b (pru_insn_infoS *insn_info, const char *argstr) | |
1083 | { | |
1084 | struct pru_reg *src2 = pru_reg_lookup (argstr); | |
1085 | if (src2 == NULL) | |
1086 | { | |
1087 | unsigned long imm8 = pru_assemble_noreloc_expression (argstr); | |
1088 | SET_INSN_FIELD (IMM8, insn_info->insn_code, imm8); | |
1089 | SET_INSN_FIELD (IO, insn_info->insn_code, 1); | |
1090 | } | |
1091 | else | |
1092 | { | |
1093 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); | |
1094 | SET_INSN_FIELD (RS2, insn_info->insn_code, src2->index); | |
1095 | SET_INSN_FIELD (RS2SEL, insn_info->insn_code, src2->regsel); | |
1096 | } | |
1097 | ||
1098 | } | |
1099 | ||
1100 | static void | |
1101 | pru_assemble_arg_B (pru_insn_infoS *insn_info, const char *argstr) | |
1102 | { | |
1103 | struct pru_reg *src2 = pru_reg_lookup (argstr); | |
1104 | if (src2 == NULL) | |
1105 | { | |
1106 | unsigned long imm8; | |
1107 | imm8 = pru_assemble_noreloc_expression (argstr); | |
1108 | if (!imm8 || imm8 > 0xff) | |
1109 | as_bad (_("loop count constant %ld is out of range [1..%d]"), | |
1110 | imm8, 0xff); | |
1111 | /* Note: HW expects the immediate loop count field | |
1112 | to be one less than the actual loop count. */ | |
1113 | SET_INSN_FIELD (IMM8, insn_info->insn_code, imm8 - 1); | |
1114 | SET_INSN_FIELD (IO, insn_info->insn_code, 1); | |
1115 | } | |
1116 | else | |
1117 | { | |
1118 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); | |
1119 | SET_INSN_FIELD (RS2, insn_info->insn_code, src2->index); | |
1120 | SET_INSN_FIELD (RS2SEL, insn_info->insn_code, src2->regsel); | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | static void | |
1125 | pru_assemble_arg_i (pru_insn_infoS *insn_info, const char *argstr) | |
1126 | { | |
1127 | unsigned long imm32; | |
1128 | ||
1129 | /* We must not generate PRU_LDI32 relocation if relaxation is disabled in | |
1130 | GAS. Consider the following scenario: GAS relaxation is disabled, so | |
1131 | DIFF* expressions are fixed and not emitted as relocations. Then if LD | |
1132 | has relaxation enabled, it may shorten LDI32 but will not update | |
1133 | accordingly the DIFF expressions. */ | |
1134 | if (pru_opt.link_relax) | |
1135 | imm32 = pru_assemble_expression (argstr, insn_info, | |
1136 | insn_info->insn_reloc, | |
1137 | BFD_RELOC_PRU_LDI32, 0); | |
1138 | else | |
1139 | imm32 = pru_assemble_noreloc_expression (argstr); | |
1140 | ||
1141 | /* QUIRK: LDI must clear IO bit high, even though it has immediate arg. */ | |
1142 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); | |
1143 | SET_INSN_FIELD (IMM16, insn_info->insn_code, imm32 & 0xffff); | |
1144 | insn_info->ldi32_imm32 = imm32; | |
1145 | } | |
1146 | ||
1147 | static void | |
1148 | pru_assemble_arg_j (pru_insn_infoS *insn_info, const char *argstr) | |
1149 | { | |
1150 | struct pru_reg *src2 = pru_reg_lookup (argstr); | |
1151 | ||
1152 | if (src2 == NULL) | |
1153 | { | |
1154 | unsigned long imm16 = pru_assemble_expression (argstr, insn_info, | |
1155 | insn_info->insn_reloc, | |
1156 | BFD_RELOC_PRU_U16_PMEMIMM, | |
1157 | 0); | |
1158 | SET_INSN_FIELD (IMM16, insn_info->insn_code, imm16); | |
1159 | SET_INSN_FIELD (IO, insn_info->insn_code, 1); | |
1160 | } | |
1161 | else | |
1162 | { | |
1163 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); | |
1164 | SET_INSN_FIELD (RS2, insn_info->insn_code, src2->index); | |
1165 | SET_INSN_FIELD (RS2SEL, insn_info->insn_code, src2->regsel); | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | static void | |
1170 | pru_assemble_arg_W (pru_insn_infoS *insn_info, const char *argstr) | |
1171 | { | |
1172 | unsigned long imm16 = pru_assemble_expression (argstr, insn_info, | |
1173 | insn_info->insn_reloc, | |
1174 | BFD_RELOC_PRU_U16, 0); | |
1175 | /* QUIRK: LDI must clear IO bit high, even though it has immediate arg. */ | |
1176 | SET_INSN_FIELD (IO, insn_info->insn_code, 0); | |
1177 | SET_INSN_FIELD (IMM16, insn_info->insn_code, imm16); | |
1178 | } | |
1179 | ||
1180 | static void | |
1181 | pru_assemble_arg_o (pru_insn_infoS *insn_info, const char *argstr) | |
1182 | { | |
1183 | unsigned long imm10 = pru_assemble_expression (argstr, insn_info, | |
1184 | insn_info->insn_reloc, | |
1185 | BFD_RELOC_PRU_S10_PCREL, 1); | |
1186 | SET_BROFF_URAW (insn_info->insn_code, imm10); | |
1187 | } | |
1188 | ||
1189 | static void | |
1190 | pru_assemble_arg_O (pru_insn_infoS *insn_info, const char *argstr) | |
1191 | { | |
1192 | unsigned long imm8 = pru_assemble_expression (argstr, insn_info, | |
1193 | insn_info->insn_reloc, | |
1194 | BFD_RELOC_PRU_U8_PCREL, 1); | |
1195 | SET_INSN_FIELD (LOOP_JMPOFFS, insn_info->insn_code, imm8); | |
1196 | } | |
1197 | ||
1198 | static void | |
1199 | pru_assemble_arg_l (pru_insn_infoS *insn_info, const char *argstr) | |
1200 | { | |
1201 | unsigned long burstlen = 0; | |
1202 | struct pru_reg *blreg = pru_reg_lookup (argstr); | |
1203 | ||
1204 | if (blreg == NULL) | |
1205 | { | |
1206 | burstlen = pru_assemble_noreloc_expression (argstr); | |
1207 | if (!burstlen || burstlen > LSSBBO_BYTECOUNT_R0_BITS7_0) | |
1208 | as_bad (_("byte count constant %ld is out of range [1..%d]"), | |
1209 | burstlen, LSSBBO_BYTECOUNT_R0_BITS7_0); | |
1210 | burstlen--; | |
1211 | } | |
1212 | else | |
1213 | { | |
1214 | if (blreg->index != 0) | |
1215 | as_bad (_("only r0 can be used as byte count register")); | |
1216 | else if (blreg->regsel > RSEL_31_24) | |
1217 | as_bad (_("only r0.bX byte fields of r0 can be used as byte count")); | |
1218 | else | |
1219 | burstlen = LSSBBO_BYTECOUNT_R0_BITS7_0 + blreg->regsel; | |
1220 | } | |
1221 | SET_BURSTLEN (insn_info->insn_code, burstlen); | |
1222 | } | |
1223 | ||
1224 | static void | |
1225 | pru_assemble_arg_n (pru_insn_infoS *insn_info, const char *argstr) | |
1226 | { | |
1227 | unsigned long burstlen = 0; | |
1228 | struct pru_reg *blreg = pru_reg_lookup (argstr); | |
1229 | ||
1230 | if (blreg == NULL) | |
1231 | { | |
1232 | burstlen = pru_assemble_noreloc_expression (argstr); | |
1233 | if (!burstlen || burstlen > LSSBBO_BYTECOUNT_R0_BITS7_0) | |
1234 | as_bad (_("byte count constant %ld is out of range [1..%d]"), | |
1235 | burstlen, LSSBBO_BYTECOUNT_R0_BITS7_0); | |
1236 | burstlen--; | |
1237 | } | |
1238 | else | |
1239 | { | |
1240 | if (blreg->index != 0) | |
1241 | as_bad (_("only r0 can be used as byte count register")); | |
1242 | else if (blreg->regsel > RSEL_31_24) | |
1243 | as_bad (_("only r0.bX byte fields of r0 can be used as byte count")); | |
1244 | else | |
1245 | burstlen = LSSBBO_BYTECOUNT_R0_BITS7_0 + blreg->regsel; | |
1246 | } | |
1247 | SET_INSN_FIELD (XFR_LENGTH, insn_info->insn_code, burstlen); | |
1248 | } | |
1249 | ||
1250 | static void | |
1251 | pru_assemble_arg_c (pru_insn_infoS *insn_info, const char *argstr) | |
1252 | { | |
1253 | unsigned long cb = pru_assemble_noreloc_expression (argstr); | |
1254 | ||
1255 | if (cb > 31) | |
1256 | as_bad (_("invalid constant table offset %ld"), cb); | |
1257 | else | |
1258 | SET_INSN_FIELD (CB, insn_info->insn_code, cb); | |
1259 | } | |
1260 | ||
1261 | static void | |
1262 | pru_assemble_arg_w (pru_insn_infoS *insn_info, const char *argstr) | |
1263 | { | |
1264 | unsigned long wk = pru_assemble_noreloc_expression (argstr); | |
1265 | ||
1266 | if (wk != 0 && wk != 1) | |
1267 | as_bad (_("invalid WakeOnStatus %ld"), wk); | |
1268 | else | |
1269 | SET_INSN_FIELD (WAKEONSTATUS, insn_info->insn_code, wk); | |
1270 | } | |
1271 | ||
1272 | static void | |
1273 | pru_assemble_arg_x (pru_insn_infoS *insn_info, const char *argstr) | |
1274 | { | |
1275 | unsigned long wba = pru_assemble_noreloc_expression (argstr); | |
1276 | ||
1277 | if (wba > 255) | |
1278 | as_bad (_("invalid XFR WideBus Address %ld"), wba); | |
1279 | else | |
1280 | SET_INSN_FIELD (XFR_WBA, insn_info->insn_code, wba); | |
1281 | } | |
1282 | ||
1283 | /* The function consume_arg takes a pointer into a string | |
1284 | of instruction tokens (args) and a pointer into a string | |
1285 | representing the expected sequence of tokens and separators. | |
1286 | It checks whether the first argument in argstr is of the | |
1287 | expected type, throwing an error if it is not, and returns | |
1288 | the pointer argstr. */ | |
1289 | static char * | |
1290 | pru_consume_arg (char *argstr, const char *parsestr) | |
1291 | { | |
1292 | char *temp; | |
1293 | ||
1294 | switch (*parsestr) | |
1295 | { | |
1296 | case 'W': | |
1297 | if (*argstr == '%') | |
1298 | { | |
1299 | if (strprefix (argstr, "%pmem") || strprefix (argstr, "%label")) | |
1300 | { | |
1301 | /* We zap the parentheses because we don't want them confused | |
1302 | with separators. */ | |
1303 | temp = strchr (argstr, '('); | |
1304 | if (temp != NULL) | |
1305 | *temp = ' '; | |
1306 | temp = strchr (argstr, ')'); | |
1307 | if (temp != NULL) | |
1308 | *temp = ' '; | |
1309 | } | |
1310 | else | |
1311 | as_bad (_("badly formed expression near %s"), argstr); | |
1312 | } | |
1313 | break; | |
1314 | ||
1315 | case 'j': | |
1316 | case 'o': | |
1317 | case 'O': | |
1318 | if (*argstr == '%') | |
1319 | { | |
1320 | /* Only 'j' really requires %label for distinguishing registers | |
1321 | from labels, but we include 'o' and 'O' here to avoid | |
1322 | confusing assembler programmers. Thus for completeness all | |
1323 | jump operands can be prefixed with %label. */ | |
1324 | if (strprefix (argstr, "%label")) | |
1325 | { | |
1326 | /* We zap the parentheses because we don't want them confused | |
1327 | with separators. */ | |
1328 | temp = strchr (argstr, '('); | |
1329 | if (temp != NULL) | |
1330 | *temp = ' '; | |
1331 | temp = strchr (argstr, ')'); | |
1332 | if (temp != NULL) | |
1333 | *temp = ' '; | |
1334 | } | |
1335 | else | |
1336 | as_bad (_("badly formed expression near %s"), argstr); | |
1337 | } | |
1338 | break; | |
1339 | ||
1340 | case 'b': | |
1341 | case 'B': | |
1342 | case 'c': | |
1343 | case 'd': | |
1344 | case 'D': | |
1345 | case 'E': | |
1346 | case 'i': | |
1347 | case 's': | |
1348 | case 'S': | |
1349 | case 'l': | |
1350 | case 'n': | |
1351 | case 'R': | |
1352 | case 'w': | |
1353 | case 'x': | |
1354 | /* We can't have %pmem here. */ | |
1355 | if (*argstr == '%') | |
1356 | as_bad (_("badly formed expression near %s"), argstr); | |
1357 | break; | |
1358 | default: | |
1359 | BAD_CASE (*parsestr); | |
1360 | break; | |
1361 | } | |
1362 | ||
1363 | return argstr; | |
1364 | } | |
1365 | ||
1366 | /* The function consume_separator takes a pointer into a string | |
1367 | of instruction tokens (args) and a pointer into a string representing | |
1368 | the expected sequence of tokens and separators. It finds the first | |
1369 | instance of the character pointed to by separator in argstr, and | |
1370 | returns a pointer to the next element of argstr, which is the | |
1371 | following token in the sequence. */ | |
1372 | static char * | |
1373 | pru_consume_separator (char *argstr, const char *separator) | |
1374 | { | |
1375 | char *p; | |
1376 | ||
1377 | p = strchr (argstr, *separator); | |
1378 | ||
1379 | if (p != NULL) | |
1380 | *p++ = 0; | |
1381 | else | |
1382 | as_bad (_("expecting %c near %s"), *separator, argstr); | |
1383 | return p; | |
1384 | } | |
1385 | ||
1386 | ||
1387 | /* The principal argument parsing function which takes a string argstr | |
1388 | representing the instruction arguments for insn, and extracts the argument | |
1389 | tokens matching parsestr into parsed_args. */ | |
1390 | static void | |
1391 | pru_parse_args (pru_insn_infoS *insn ATTRIBUTE_UNUSED, char *argstr, | |
1392 | const char *parsestr, char **parsed_args) | |
1393 | { | |
1394 | char *p; | |
1395 | char *end = NULL; | |
1396 | int i; | |
1397 | p = argstr; | |
1398 | i = 0; | |
1399 | bfd_boolean terminate = FALSE; | |
1400 | ||
1401 | /* This rest of this function is it too fragile and it mostly works, | |
1402 | therefore special case this one. */ | |
1403 | if (*parsestr == 0 && argstr != 0) | |
1404 | { | |
1405 | as_bad (_("too many arguments")); | |
1406 | parsed_args[0] = NULL; | |
1407 | return; | |
1408 | } | |
1409 | ||
1410 | while (p != NULL && !terminate && i < PRU_MAX_INSN_TOKENS) | |
1411 | { | |
1412 | parsed_args[i] = pru_consume_arg (p, parsestr); | |
1413 | ++parsestr; | |
1414 | if (*parsestr != '\0') | |
1415 | { | |
1416 | p = pru_consume_separator (p, parsestr); | |
1417 | ++parsestr; | |
1418 | } | |
1419 | else | |
1420 | { | |
1421 | /* Check that the argument string has no trailing arguments. */ | |
1422 | /* If we've got a %pmem relocation, we've zapped the parens with | |
1423 | spaces. */ | |
1424 | if (strprefix (p, "%pmem") || strprefix (p, "%label")) | |
1425 | end = strpbrk (p, ","); | |
1426 | else | |
1427 | end = strpbrk (p, " ,"); | |
1428 | ||
1429 | if (end != NULL) | |
1430 | as_bad (_("too many arguments")); | |
1431 | } | |
1432 | ||
1433 | if (*parsestr == '\0' || (p != NULL && *p == '\0')) | |
1434 | terminate = TRUE; | |
1435 | ++i; | |
1436 | } | |
1437 | ||
1438 | parsed_args[i] = NULL; | |
1439 | ||
1440 | /* There are no instructions with optional arguments; complain. */ | |
1441 | if (*parsestr != '\0') | |
1442 | as_bad (_("missing argument")); | |
1443 | } | |
1444 | ||
1445 | \f | |
1446 | /** Assembler output support. */ | |
1447 | ||
1448 | /* Output a normal instruction. */ | |
1449 | static void | |
1450 | output_insn (pru_insn_infoS *insn) | |
1451 | { | |
1452 | char *f; | |
1453 | pru_insn_relocS *reloc; | |
1454 | ||
1455 | f = frag_more (4); | |
1456 | /* This allocates enough space for the instruction | |
1457 | and puts it in the current frag. */ | |
1458 | md_number_to_chars (f, insn->insn_code, 4); | |
1459 | /* Emit debug info. */ | |
1460 | dwarf2_emit_insn (4); | |
1461 | /* Create any fixups to be acted on later. */ | |
1462 | for (reloc = insn->insn_reloc; reloc != NULL; reloc = reloc->reloc_next) | |
1463 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, | |
1464 | &reloc->reloc_expression, reloc->reloc_pcrel, | |
1465 | reloc->reloc_type); | |
1466 | } | |
1467 | ||
1468 | /* Output two LDI instructions from LDI32 macro */ | |
1469 | static void | |
1470 | output_insn_ldi32 (pru_insn_infoS *insn) | |
1471 | { | |
1472 | char *f; | |
1473 | pru_insn_relocS *reloc; | |
1474 | unsigned long insn2; | |
1475 | ||
1476 | f = frag_more (8); | |
1477 | md_number_to_chars (f, insn->insn_code, 4); | |
1478 | ||
1479 | insn2 = insn->insn_code; | |
1480 | SET_INSN_FIELD (IMM16, insn2, insn->ldi32_imm32 >> 16); | |
1481 | SET_INSN_FIELD (RDSEL, insn2, RSEL_31_16); | |
1482 | md_number_to_chars (f + 4, insn2, 4); | |
1483 | ||
1484 | /* Emit debug info. */ | |
1485 | dwarf2_emit_insn (8); | |
1486 | ||
1487 | /* Create any fixups to be acted on later. */ | |
1488 | for (reloc = insn->insn_reloc; reloc != NULL; reloc = reloc->reloc_next) | |
1489 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, | |
1490 | &reloc->reloc_expression, reloc->reloc_pcrel, | |
1491 | reloc->reloc_type); | |
1492 | } | |
1493 | ||
1494 | \f | |
1495 | /** External interfaces. */ | |
1496 | ||
1497 | /* The following functions are called by machine-independent parts of | |
1498 | the assembler. */ | |
1499 | int | |
1500 | md_parse_option (int c, const char *arg ATTRIBUTE_UNUSED) | |
1501 | { | |
1502 | switch (c) | |
1503 | { | |
1504 | case 'r': | |
1505 | /* Hidden option for self-test mode. */ | |
1506 | pru_mode = PRU_MODE_TEST; | |
1507 | break; | |
1508 | case OPTION_LINK_RELAX: | |
1509 | pru_opt.link_relax = TRUE; | |
1510 | break; | |
1511 | case OPTION_NO_LINK_RELAX: | |
1512 | pru_opt.link_relax = FALSE; | |
1513 | break; | |
1514 | case OPTION_NO_WARN_REGNAME_LABEL: | |
1515 | pru_opt.warn_regname_label = FALSE; | |
1516 | break; | |
1517 | default: | |
1518 | return 0; | |
1519 | break; | |
1520 | } | |
1521 | ||
1522 | return 1; | |
1523 | } | |
1524 | ||
1525 | const char * | |
1526 | pru_target_format (void) | |
1527 | { | |
1528 | return "elf32-pru"; | |
1529 | } | |
1530 | ||
1531 | /* Machine-dependent usage message. */ | |
1532 | void | |
1533 | md_show_usage (FILE *stream) | |
1534 | { | |
1535 | fprintf (stream, | |
1536 | _("PRU options:\n" | |
1537 | " -mlink-relax generate relocations for linker relaxation (default).\n" | |
1538 | " -mno-link-relax don't generate relocations for linker relaxation.\n" | |
1539 | )); | |
1540 | ||
1541 | } | |
1542 | ||
1543 | /* This function is called once, at assembler startup time. | |
1544 | It should set up all the tables, etc. that the MD part of the | |
1545 | assembler will need. */ | |
1546 | void | |
1547 | md_begin (void) | |
1548 | { | |
1549 | int i; | |
1550 | const char *inserted; | |
1551 | ||
1552 | /* Create and fill a hashtable for the PRU opcodes, registers and | |
1553 | arguments. */ | |
1554 | pru_opcode_hash = hash_new (); | |
1555 | pru_reg_hash = hash_new (); | |
1556 | ||
1557 | for (i = 0; i < NUMOPCODES; ++i) | |
1558 | { | |
1559 | inserted | |
1560 | = hash_insert (pru_opcode_hash, pru_opcodes[i].name, | |
1561 | (PTR) & pru_opcodes[i]); | |
1562 | if (inserted != NULL) | |
1563 | { | |
1564 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), | |
1565 | pru_opcodes[i].name, inserted); | |
1566 | /* Probably a memory allocation problem? Give up now. */ | |
1567 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
1568 | } | |
1569 | } | |
1570 | ||
1571 | for (i = 0; i < pru_num_regs; ++i) | |
1572 | { | |
1573 | inserted | |
1574 | = hash_insert (pru_reg_hash, pru_regs[i].name, | |
1575 | (PTR) & pru_regs[i]); | |
1576 | if (inserted != NULL) | |
1577 | { | |
1578 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), | |
1579 | pru_regs[i].name, inserted); | |
1580 | /* Probably a memory allocation problem? Give up now. */ | |
1581 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
1582 | } | |
1583 | ||
1584 | } | |
1585 | ||
1586 | linkrelax = pru_opt.link_relax; | |
1587 | /* Initialize the alignment data. */ | |
1588 | pru_current_align_seg = now_seg; | |
1589 | pru_last_label = NULL; | |
1590 | pru_current_align = 0; | |
1591 | } | |
1592 | ||
1593 | ||
1594 | /* Assembles a single line of PRU assembly language. */ | |
1595 | void | |
1596 | md_assemble (char *op_str) | |
1597 | { | |
1598 | char *argstr; | |
1599 | char *op_strdup = NULL; | |
1600 | pru_insn_infoS thisinsn; | |
1601 | pru_insn_infoS *insn = &thisinsn; | |
1602 | ||
1603 | /* Make sure we are aligned on a 4-byte boundary. */ | |
1604 | if (pru_current_align < 2) | |
1605 | pru_align (2, NULL, pru_last_label); | |
1606 | else if (pru_current_align > 2) | |
1607 | pru_current_align = 2; | |
1608 | pru_last_label = NULL; | |
1609 | ||
1610 | /* We don't want to clobber to op_str | |
1611 | because we want to be able to use it in messages. */ | |
1612 | op_strdup = strdup (op_str); | |
1613 | insn->insn_tokens[0] = strtok (op_strdup, " "); | |
1614 | argstr = strtok (NULL, ""); | |
1615 | ||
1616 | /* Assemble the opcode. */ | |
1617 | insn->insn_pru_opcode = pru_opcode_lookup (insn->insn_tokens[0]); | |
1618 | insn->insn_reloc = NULL; | |
1619 | ||
1620 | if (insn->insn_pru_opcode != NULL) | |
1621 | { | |
1622 | const char *argsfmt = insn->insn_pru_opcode->args; | |
1623 | const char **argtk = &insn->insn_tokens[1]; | |
1624 | const char *argp; | |
1625 | ||
1626 | /* Set the opcode for the instruction. */ | |
1627 | insn->insn_code = insn->insn_pru_opcode->match; | |
1628 | ||
1629 | if (pru_mode == PRU_MODE_TEST) | |
1630 | { | |
1631 | /* Add the "expected" instruction parameter used for validation. */ | |
1632 | argsfmt = malloc (strlen (argsfmt) + 3); | |
1633 | sprintf ((char *)argsfmt, "%s,E", insn->insn_pru_opcode->args); | |
1634 | } | |
1635 | pru_parse_args (insn, argstr, argsfmt, | |
1636 | (char **) &insn->insn_tokens[1]); | |
1637 | ||
1638 | for (argp = argsfmt; !had_errors () && *argp && *argtk; ++argp) | |
1639 | { | |
1640 | gas_assert (argtk <= &insn->insn_tokens[PRU_MAX_INSN_TOKENS]); | |
1641 | ||
1642 | switch (*argp) | |
1643 | { | |
1644 | case ',': | |
1645 | continue; | |
1646 | ||
1647 | case 'd': | |
1648 | pru_assemble_arg_d (insn, *argtk++); | |
1649 | continue; | |
1650 | case 'D': | |
1651 | pru_assemble_arg_D (insn, *argtk++); | |
1652 | continue; | |
1653 | case 'R': | |
1654 | pru_assemble_arg_R (insn, *argtk++); | |
1655 | continue; | |
1656 | case 's': | |
1657 | pru_assemble_arg_s (insn, *argtk++); | |
1658 | continue; | |
1659 | case 'S': | |
1660 | pru_assemble_arg_S (insn, *argtk++); | |
1661 | continue; | |
1662 | case 'b': | |
1663 | pru_assemble_arg_b (insn, *argtk++); | |
1664 | continue; | |
1665 | case 'B': | |
1666 | pru_assemble_arg_B (insn, *argtk++); | |
1667 | continue; | |
1668 | case 'i': | |
1669 | pru_assemble_arg_i (insn, *argtk++); | |
1670 | continue; | |
1671 | case 'j': | |
1672 | pru_assemble_arg_j (insn, *argtk++); | |
1673 | continue; | |
1674 | case 'W': | |
1675 | pru_assemble_arg_W (insn, *argtk++); | |
1676 | continue; | |
1677 | case 'o': | |
1678 | pru_assemble_arg_o (insn, *argtk++); | |
1679 | continue; | |
1680 | case 'O': | |
1681 | pru_assemble_arg_O (insn, *argtk++); | |
1682 | continue; | |
1683 | case 'l': | |
1684 | pru_assemble_arg_l (insn, *argtk++); | |
1685 | continue; | |
1686 | case 'n': | |
1687 | pru_assemble_arg_n (insn, *argtk++); | |
1688 | continue; | |
1689 | case 'c': | |
1690 | pru_assemble_arg_c (insn, *argtk++); | |
1691 | continue; | |
1692 | case 'w': | |
1693 | pru_assemble_arg_w (insn, *argtk++); | |
1694 | continue; | |
1695 | case 'x': | |
1696 | pru_assemble_arg_x (insn, *argtk++); | |
1697 | continue; | |
1698 | ||
1699 | case 'E': | |
1700 | pru_check_assembly (insn->insn_code, *argtk++); | |
1701 | default: | |
1702 | BAD_CASE (*argp); | |
1703 | } | |
1704 | } | |
1705 | ||
1706 | if (*argp && !had_errors ()) | |
1707 | as_bad (_("missing argument")); | |
1708 | ||
1709 | if (!had_errors ()) | |
1710 | { | |
1711 | if (insn->insn_pru_opcode->pinfo & PRU_INSN_LDI32) | |
1712 | { | |
1713 | output_insn_ldi32 (insn); | |
1714 | } | |
1715 | else | |
1716 | { | |
1717 | output_insn (insn); | |
1718 | } | |
1719 | } | |
1720 | ||
1721 | if (pru_mode == PRU_MODE_TEST) | |
1722 | free ((char *)argsfmt); | |
1723 | } | |
1724 | else | |
1725 | /* Unrecognised instruction - error. */ | |
1726 | as_bad (_("unrecognised instruction %s"), insn->insn_tokens[0]); | |
1727 | ||
1728 | /* Don't leak memory. */ | |
1729 | pru_insn_reloc_destroy (insn->insn_reloc); | |
1730 | free (op_strdup); | |
1731 | } | |
1732 | ||
1733 | /* Round up section size. */ | |
1734 | valueT | |
1735 | md_section_align (asection *seg, valueT addr) | |
1736 | { | |
1737 | int align = bfd_get_section_alignment (stdoutput, seg); | |
1738 | return ((addr + (1 << align) - 1) & (-((valueT) 1 << align))); | |
1739 | } | |
1740 | ||
1741 | /* Implement tc_fix_adjustable. */ | |
1742 | int | |
1743 | pru_fix_adjustable (fixS *fixp) | |
1744 | { | |
1745 | if (fixp->fx_addsy == NULL) | |
1746 | return 1; | |
1747 | ||
1748 | /* Prevent all adjustments to global symbols. */ | |
1749 | if (OUTPUT_FLAVOR == bfd_target_elf_flavour | |
1750 | && (S_IS_EXTERNAL (fixp->fx_addsy) || S_IS_WEAK (fixp->fx_addsy))) | |
1751 | return 0; | |
1752 | ||
1753 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT | |
1754 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) | |
1755 | return 0; | |
1756 | ||
1757 | /* Preserve relocations against symbols with function type. */ | |
1758 | if (symbol_get_bfdsym (fixp->fx_addsy)->flags & BSF_FUNCTION) | |
1759 | return 0; | |
1760 | ||
1761 | return 1; | |
1762 | } | |
1763 | ||
1764 | /* The function tc_gen_reloc creates a relocation structure for the | |
1765 | fixup fixp, and returns a pointer to it. This structure is passed | |
1766 | to bfd_install_relocation so that it can be written to the object | |
1767 | file for linking. */ | |
1768 | arelent * | |
1769 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) | |
1770 | { | |
1771 | arelent *reloc = XNEW (arelent); | |
1772 | reloc->sym_ptr_ptr = XNEW (asymbol *); | |
1773 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); | |
1774 | ||
1775 | reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; | |
1776 | reloc->addend = fixp->fx_offset; /* fixp->fx_addnumber; */ | |
1777 | ||
1778 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); | |
1779 | if (reloc->howto == NULL) | |
1780 | { | |
1781 | as_bad_where (fixp->fx_file, fixp->fx_line, | |
1782 | _("can't represent relocation type %s"), | |
1783 | bfd_get_reloc_code_name (fixp->fx_r_type)); | |
1784 | ||
1785 | /* Set howto to a garbage value so that we can keep going. */ | |
1786 | reloc->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_32); | |
1787 | gas_assert (reloc->howto != NULL); | |
1788 | } | |
1789 | return reloc; | |
1790 | } | |
1791 | ||
1792 | long | |
1793 | md_pcrel_from (fixS *fixP ATTRIBUTE_UNUSED) | |
1794 | { | |
1795 | return fixP->fx_where + fixP->fx_frag->fr_address; | |
1796 | } | |
1797 | ||
1798 | /* Called just before the assembler exits. */ | |
1799 | void | |
1800 | md_end (void) | |
1801 | { | |
1802 | hash_die (pru_opcode_hash); | |
1803 | hash_die (pru_reg_hash); | |
1804 | } | |
1805 | ||
1806 | symbolS * | |
1807 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) | |
1808 | { | |
1809 | return NULL; | |
1810 | } | |
1811 | ||
1812 | /* Implement tc_frob_label. */ | |
1813 | void | |
1814 | pru_frob_label (symbolS *lab) | |
1815 | { | |
1816 | /* Emit dwarf information. */ | |
1817 | dwarf2_emit_label (lab); | |
1818 | ||
1819 | /* Update the label's address with the current output pointer. */ | |
1820 | symbol_set_frag (lab, frag_now); | |
1821 | S_SET_VALUE (lab, (valueT) frag_now_fix ()); | |
1822 | ||
1823 | /* Record this label for future adjustment after we find out what | |
1824 | kind of data it references, and the required alignment therewith. */ | |
1825 | pru_last_label = lab; | |
1826 | ||
1827 | if (pru_opt.warn_regname_label && pru_reg_lookup (S_GET_NAME (lab))) | |
1828 | as_warn (_("Label \"%s\" matches a CPU register name"), S_GET_NAME (lab)); | |
1829 | } | |
1830 | ||
1831 | static inline char * | |
1832 | skip_space (char *s) | |
1833 | { | |
1834 | while (*s == ' ' || *s == '\t') | |
1835 | ++s; | |
1836 | return s; | |
1837 | } | |
1838 | ||
1839 | /* Parse special CONS expression: pmem (expression). Idea from AVR. | |
1840 | ||
1841 | Used to catch and mark code (program memory) in constant expression | |
1842 | relocations. Return non-zero for program memory. */ | |
1843 | ||
1844 | int | |
1845 | pru_parse_cons_expression (expressionS *exp, int nbytes) | |
1846 | { | |
1847 | int is_pmem = FALSE; | |
1848 | char *tmp; | |
1849 | ||
1850 | tmp = input_line_pointer = skip_space (input_line_pointer); | |
1851 | ||
1852 | if (nbytes == 4 || nbytes == 2) | |
1853 | { | |
1854 | const char *pmem_str = "%pmem"; | |
1855 | int len = strlen (pmem_str); | |
1856 | ||
1857 | if (strncasecmp (input_line_pointer, pmem_str, len) == 0) | |
1858 | { | |
1859 | input_line_pointer = skip_space (input_line_pointer + len); | |
1860 | ||
1861 | if (*input_line_pointer == '(') | |
1862 | { | |
1863 | input_line_pointer = skip_space (input_line_pointer + 1); | |
1864 | is_pmem = TRUE; | |
1865 | expression (exp); | |
1866 | ||
1867 | if (*input_line_pointer == ')') | |
1868 | ++input_line_pointer; | |
1869 | else | |
1870 | { | |
1871 | as_bad (_("`)' required")); | |
1872 | is_pmem = FALSE; | |
1873 | } | |
1874 | ||
1875 | return is_pmem; | |
1876 | } | |
1877 | ||
1878 | input_line_pointer = tmp; | |
1879 | } | |
1880 | } | |
1881 | ||
1882 | expression (exp); | |
1883 | ||
1884 | return is_pmem; | |
1885 | } | |
1886 | ||
1887 | /* Implement TC_CONS_FIX_NEW. */ | |
1888 | void | |
1889 | pru_cons_fix_new (fragS *frag, int where, unsigned int nbytes, | |
1890 | expressionS *exp, const int is_pmem) | |
1891 | { | |
1892 | bfd_reloc_code_real_type r; | |
1893 | ||
1894 | switch (nbytes | (!!is_pmem << 8)) | |
1895 | { | |
1896 | case 1 | (0 << 8): r = BFD_RELOC_8; break; | |
1897 | case 2 | (0 << 8): r = BFD_RELOC_16; break; | |
1898 | case 4 | (0 << 8): r = BFD_RELOC_32; break; | |
1899 | case 8 | (0 << 8): r = BFD_RELOC_64; break; | |
1900 | case 2 | (1 << 8): r = BFD_RELOC_PRU_16_PMEM; break; | |
1901 | case 4 | (1 << 8): r = BFD_RELOC_PRU_32_PMEM; break; | |
1902 | default: | |
1903 | as_bad (_("illegal %s relocation size: %d"), | |
1904 | is_pmem ? "text" : "data", nbytes); | |
1905 | return; | |
1906 | } | |
1907 | ||
1908 | fix_new_exp (frag, where, (int) nbytes, exp, 0, r); | |
1909 | } | |
1910 | ||
1911 | /* Implement tc_regname_to_dw2regnum, to convert REGNAME to a DWARF-2 | |
1912 | register number. */ | |
1913 | int | |
1914 | pru_regname_to_dw2regnum (char *regname) | |
1915 | { | |
1916 | struct pru_reg *r = pru_reg_lookup (regname); | |
1917 | if (r == NULL) | |
1918 | return -1; | |
1919 | return r->index; | |
1920 | } | |
1921 | ||
1922 | /* Implement tc_cfi_frame_initial_instructions, to initialize the DWARF-2 | |
1923 | unwind information for this procedure. */ | |
1924 | void | |
1925 | pru_frame_initial_instructions (void) | |
1926 | { | |
1927 | const unsigned fp_regno = 4; | |
1928 | cfi_add_CFA_def_cfa (fp_regno, 0); | |
1929 | } | |
1930 | ||
1931 | bfd_boolean | |
1932 | pru_allow_local_subtract (expressionS * left, | |
1933 | expressionS * right, | |
1934 | segT section) | |
1935 | { | |
1936 | /* If we are not in relaxation mode, subtraction is OK. */ | |
1937 | if (!linkrelax) | |
1938 | return TRUE; | |
1939 | ||
1940 | /* If the symbols are not in a code section then they are OK. */ | |
1941 | if ((section->flags & SEC_CODE) == 0) | |
1942 | return TRUE; | |
1943 | ||
1944 | if (left->X_add_symbol == right->X_add_symbol) | |
1945 | return TRUE; | |
1946 | ||
1947 | /* We have to assume that there may be instructions between the | |
1948 | two symbols and that relaxation may increase the distance between | |
1949 | them. */ | |
1950 | return FALSE; | |
1951 | } |