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36591ba1 | 1 | /* Altera Nios II assembler. |
b90efa5b | 2 | Copyright (C) 2012-2015 Free Software Foundation, Inc. |
36591ba1 SL |
3 | Contributed by Nigel Gray (ngray@altera.com). |
4 | Contributed by Mentor Graphics, Inc. | |
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 "opcode/nios2.h" | |
25 | #include "elf/nios2.h" | |
26 | #include "tc-nios2.h" | |
27 | #include "bfd.h" | |
28 | #include "dwarf2dbg.h" | |
29 | #include "subsegs.h" | |
30 | #include "safe-ctype.h" | |
31 | #include "dw2gencfi.h" | |
32 | ||
33 | #ifndef OBJ_ELF | |
34 | /* We are not supporting any other target so we throw a compile time error. */ | |
35 | OBJ_ELF not defined | |
36 | #endif | |
37 | ||
38 | /* We can choose our endianness at run-time, regardless of configuration. */ | |
39 | extern int target_big_endian; | |
40 | ||
41 | /* This array holds the chars that always start a comment. If the | |
42 | pre-processor is disabled, these aren't very useful. */ | |
43 | const char comment_chars[] = "#"; | |
44 | ||
45 | /* This array holds the chars that only start a comment at the beginning of | |
46 | a line. If the line seems to have the form '# 123 filename' | |
47 | .line and .file directives will appear in the pre-processed output. */ | |
48 | /* Note that input_file.c hand checks for '#' at the beginning of the | |
49 | first line of the input file. This is because the compiler outputs | |
50 | #NO_APP at the beginning of its output. */ | |
51 | /* Also note that C style comments are always supported. */ | |
52 | const char line_comment_chars[] = "#"; | |
53 | ||
54 | /* This array holds machine specific line separator characters. */ | |
55 | const char line_separator_chars[] = ";"; | |
56 | ||
57 | /* Chars that can be used to separate mant from exp in floating point nums. */ | |
58 | const char EXP_CHARS[] = "eE"; | |
59 | ||
60 | /* Chars that mean this number is a floating point constant. */ | |
61 | /* As in 0f12.456 */ | |
62 | /* or 0d1.2345e12 */ | |
63 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; | |
64 | ||
65 | /* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be | |
66 | changed in read.c. Ideally it shouldn't have to know about it at all, | |
67 | but nothing is ideal around here. */ | |
68 | ||
69 | /* Machine-dependent command-line options. */ | |
70 | ||
71 | const char *md_shortopts = "r"; | |
72 | ||
73 | struct option md_longopts[] = { | |
74 | #define OPTION_RELAX_ALL (OPTION_MD_BASE + 0) | |
75 | {"relax-all", no_argument, NULL, OPTION_RELAX_ALL}, | |
76 | #define OPTION_NORELAX (OPTION_MD_BASE + 1) | |
77 | {"no-relax", no_argument, NULL, OPTION_NORELAX}, | |
78 | #define OPTION_RELAX_SECTION (OPTION_MD_BASE + 2) | |
79 | {"relax-section", no_argument, NULL, OPTION_RELAX_SECTION}, | |
80 | #define OPTION_EB (OPTION_MD_BASE + 3) | |
81 | {"EB", no_argument, NULL, OPTION_EB}, | |
82 | #define OPTION_EL (OPTION_MD_BASE + 4) | |
83 | {"EL", no_argument, NULL, OPTION_EL} | |
84 | }; | |
85 | ||
86 | size_t md_longopts_size = sizeof (md_longopts); | |
87 | ||
88 | /* The assembler supports three different relaxation modes, controlled by | |
89 | command-line options. */ | |
90 | typedef enum | |
91 | { | |
92 | relax_section = 0, | |
93 | relax_none, | |
94 | relax_all | |
95 | } relax_optionT; | |
96 | ||
97 | /* Struct contains all assembler options set with .set. */ | |
98 | struct | |
99 | { | |
100 | /* .set noat -> noat = 1 allows assembly code to use at without warning | |
101 | and macro expansions generate a warning. | |
102 | .set at -> noat = 0, assembly code using at warn but macro expansions | |
103 | do not generate warnings. */ | |
104 | bfd_boolean noat; | |
105 | ||
106 | /* .set nobreak -> nobreak = 1 allows assembly code to use ba,bt without | |
107 | warning. | |
108 | .set break -> nobreak = 0, assembly code using ba,bt warns. */ | |
109 | bfd_boolean nobreak; | |
110 | ||
111 | /* .cmd line option -relax-all allows all branches and calls to be replaced | |
112 | with longer versions. | |
113 | -no-relax inhibits branch/call conversion. | |
114 | The default value is relax_section, which relaxes branches within | |
115 | a section. */ | |
116 | relax_optionT relax; | |
117 | ||
118 | } nios2_as_options = {FALSE, FALSE, relax_section}; | |
119 | ||
120 | ||
121 | typedef struct nios2_insn_reloc | |
122 | { | |
123 | /* Any expression in the instruction is parsed into this field, | |
124 | which is passed to fix_new_exp() to generate a fixup. */ | |
125 | expressionS reloc_expression; | |
126 | ||
127 | /* The type of the relocation to be applied. */ | |
128 | bfd_reloc_code_real_type reloc_type; | |
129 | ||
130 | /* PC-relative. */ | |
131 | unsigned int reloc_pcrel; | |
132 | ||
133 | /* The next relocation to be applied to the instruction. */ | |
134 | struct nios2_insn_reloc *reloc_next; | |
135 | } nios2_insn_relocS; | |
136 | ||
137 | /* This struct is used to hold state when assembling instructions. */ | |
138 | typedef struct nios2_insn_info | |
139 | { | |
140 | /* Assembled instruction. */ | |
141 | unsigned long insn_code; | |
96ba4233 SL |
142 | |
143 | /* Constant bits masked into insn_code for self-check mode. */ | |
144 | unsigned long constant_bits; | |
145 | ||
36591ba1 SL |
146 | /* Pointer to the relevant bit of the opcode table. */ |
147 | const struct nios2_opcode *insn_nios2_opcode; | |
148 | /* After parsing ptrs to the tokens in the instruction fill this array | |
149 | it is terminated with a null pointer (hence the first +1). | |
150 | The second +1 is because in some parts of the code the opcode | |
151 | is not counted as a token, but still placed in this array. */ | |
152 | const char *insn_tokens[NIOS2_MAX_INSN_TOKENS + 1 + 1]; | |
153 | ||
154 | /* This holds information used to generate fixups | |
155 | and eventually relocations if it is not null. */ | |
156 | nios2_insn_relocS *insn_reloc; | |
157 | } nios2_insn_infoS; | |
158 | ||
36591ba1 SL |
159 | |
160 | /* This struct is used to convert Nios II pseudo-ops into the | |
161 | corresponding real op. */ | |
162 | typedef struct nios2_ps_insn_info | |
163 | { | |
164 | /* Map this pseudo_op... */ | |
165 | const char *pseudo_insn; | |
166 | ||
167 | /* ...to this real instruction. */ | |
168 | const char *insn; | |
169 | ||
170 | /* Call this function to modify the operands.... */ | |
171 | void (*arg_modifer_func) (char ** parsed_args, const char *arg, int num, | |
172 | int start); | |
173 | ||
174 | /* ...with these arguments. */ | |
175 | const char *arg_modifier; | |
176 | int num; | |
177 | int index; | |
178 | ||
179 | /* If arg_modifier_func allocates new memory, provide this function | |
180 | to free it afterwards. */ | |
181 | void (*arg_cleanup_func) (char **parsed_args, int num, int start); | |
182 | } nios2_ps_insn_infoS; | |
183 | ||
184 | /* Opcode hash table. */ | |
185 | static struct hash_control *nios2_opcode_hash = NULL; | |
186 | #define nios2_opcode_lookup(NAME) \ | |
187 | ((struct nios2_opcode *) hash_find (nios2_opcode_hash, (NAME))) | |
188 | ||
189 | /* Register hash table. */ | |
190 | static struct hash_control *nios2_reg_hash = NULL; | |
191 | #define nios2_reg_lookup(NAME) \ | |
192 | ((struct nios2_reg *) hash_find (nios2_reg_hash, (NAME))) | |
193 | ||
36591ba1 SL |
194 | |
195 | /* Pseudo-op hash table. */ | |
196 | static struct hash_control *nios2_ps_hash = NULL; | |
197 | #define nios2_ps_lookup(NAME) \ | |
198 | ((nios2_ps_insn_infoS *) hash_find (nios2_ps_hash, (NAME))) | |
199 | ||
200 | /* The known current alignment of the current section. */ | |
201 | static int nios2_current_align; | |
202 | static segT nios2_current_align_seg; | |
203 | ||
204 | static int nios2_auto_align_on = 1; | |
205 | ||
206 | /* The last seen label in the current section. This is used to auto-align | |
207 | labels preceeding instructions. */ | |
208 | static symbolS *nios2_last_label; | |
209 | ||
210 | #ifdef OBJ_ELF | |
211 | /* Pre-defined "_GLOBAL_OFFSET_TABLE_" */ | |
212 | symbolS *GOT_symbol; | |
213 | #endif | |
214 | ||
215 | \f | |
216 | /** Utility routines. */ | |
217 | /* Function md_chars_to_number takes the sequence of | |
218 | bytes in buf and returns the corresponding value | |
219 | in an int. n must be 1, 2 or 4. */ | |
220 | static valueT | |
221 | md_chars_to_number (char *buf, int n) | |
222 | { | |
223 | int i; | |
224 | valueT val; | |
225 | ||
226 | gas_assert (n == 1 || n == 2 || n == 4); | |
227 | ||
228 | val = 0; | |
229 | if (target_big_endian) | |
230 | for (i = 0; i < n; ++i) | |
231 | val = val | ((buf[i] & 0xff) << 8 * (n - (i + 1))); | |
232 | else | |
233 | for (i = 0; i < n; ++i) | |
234 | val = val | ((buf[i] & 0xff) << 8 * i); | |
235 | return val; | |
236 | } | |
237 | ||
238 | ||
239 | /* This function turns a C long int, short int or char | |
240 | into the series of bytes that represent the number | |
241 | on the target machine. */ | |
242 | void | |
243 | md_number_to_chars (char *buf, valueT val, int n) | |
244 | { | |
245 | gas_assert (n == 1 || n == 2 || n == 4 || n == 8); | |
246 | if (target_big_endian) | |
247 | number_to_chars_bigendian (buf, val, n); | |
248 | else | |
249 | number_to_chars_littleendian (buf, val, n); | |
250 | } | |
251 | ||
252 | /* Turn a string in input_line_pointer into a floating point constant | |
253 | of type TYPE, and store the appropriate bytes in *LITP. The number | |
254 | of LITTLENUMS emitted is stored in *SIZEP. An error message is | |
255 | returned, or NULL on OK. */ | |
256 | char * | |
257 | md_atof (int type, char *litP, int *sizeP) | |
258 | { | |
259 | int prec; | |
260 | LITTLENUM_TYPE words[4]; | |
261 | char *t; | |
262 | int i; | |
263 | ||
264 | switch (type) | |
265 | { | |
266 | case 'f': | |
267 | prec = 2; | |
268 | break; | |
269 | case 'd': | |
270 | prec = 4; | |
271 | break; | |
272 | default: | |
273 | *sizeP = 0; | |
274 | return _("bad call to md_atof"); | |
275 | } | |
276 | ||
277 | t = atof_ieee (input_line_pointer, type, words); | |
278 | if (t) | |
279 | input_line_pointer = t; | |
280 | ||
281 | *sizeP = prec * 2; | |
282 | ||
283 | if (! target_big_endian) | |
284 | for (i = prec - 1; i >= 0; i--, litP += 2) | |
285 | md_number_to_chars (litP, (valueT) words[i], 2); | |
286 | else | |
287 | for (i = 0; i < prec; i++, litP += 2) | |
288 | md_number_to_chars (litP, (valueT) words[i], 2); | |
289 | ||
290 | return NULL; | |
291 | } | |
292 | ||
293 | /* Return true if STR starts with PREFIX, which should be a string literal. */ | |
294 | #define strprefix(STR, PREFIX) \ | |
295 | (strncmp ((STR), PREFIX, strlen (PREFIX)) == 0) | |
296 | ||
36591ba1 SL |
297 | |
298 | /* Return true if STR is prefixed with a special relocation operator. */ | |
299 | static int | |
300 | nios2_special_relocation_p (const char *str) | |
301 | { | |
302 | return (strprefix (str, "%lo") | |
303 | || strprefix (str, "%hi") | |
304 | || strprefix (str, "%hiadj") | |
305 | || strprefix (str, "%gprel") | |
306 | || strprefix (str, "%got") | |
307 | || strprefix (str, "%call") | |
308 | || strprefix (str, "%gotoff_lo") | |
309 | || strprefix (str, "%gotoff_hiadj") | |
310 | || strprefix (str, "%tls_gd") | |
311 | || strprefix (str, "%tls_ldm") | |
312 | || strprefix (str, "%tls_ldo") | |
313 | || strprefix (str, "%tls_ie") | |
314 | || strprefix (str, "%tls_le") | |
315 | || strprefix (str, "%gotoff")); | |
316 | } | |
317 | ||
36591ba1 SL |
318 | |
319 | /* nop fill pattern for text section. */ | |
320 | static char const nop[4] = { 0x3a, 0x88, 0x01, 0x00 }; | |
321 | ||
322 | /* Handles all machine-dependent alignment needs. */ | |
323 | static void | |
324 | nios2_align (int log_size, const char *pfill, symbolS *label) | |
325 | { | |
326 | int align; | |
327 | long max_alignment = 15; | |
328 | ||
329 | /* The front end is prone to changing segments out from under us | |
330 | temporarily when -g is in effect. */ | |
331 | int switched_seg_p = (nios2_current_align_seg != now_seg); | |
332 | ||
333 | align = log_size; | |
334 | if (align > max_alignment) | |
335 | { | |
336 | align = max_alignment; | |
337 | as_bad (_("Alignment too large: %d. assumed"), align); | |
338 | } | |
339 | else if (align < 0) | |
340 | { | |
341 | as_warn (_("Alignment negative: 0 assumed")); | |
342 | align = 0; | |
343 | } | |
344 | ||
345 | if (align != 0) | |
346 | { | |
347 | if (subseg_text_p (now_seg) && align >= 2) | |
348 | { | |
349 | /* First, make sure we're on a four-byte boundary, in case | |
350 | someone has been putting .byte values the text section. */ | |
351 | if (nios2_current_align < 2 || switched_seg_p) | |
352 | frag_align (2, 0, 0); | |
353 | ||
354 | /* Now fill in the alignment pattern. */ | |
355 | if (pfill != NULL) | |
356 | frag_align_pattern (align, pfill, sizeof nop, 0); | |
357 | else | |
358 | frag_align (align, 0, 0); | |
359 | } | |
360 | else | |
361 | frag_align (align, 0, 0); | |
362 | ||
363 | if (!switched_seg_p) | |
364 | nios2_current_align = align; | |
365 | ||
366 | /* If the last label was in a different section we can't align it. */ | |
367 | if (label != NULL && !switched_seg_p) | |
368 | { | |
369 | symbolS *sym; | |
370 | int label_seen = FALSE; | |
371 | struct frag *old_frag; | |
372 | valueT old_value; | |
373 | valueT new_value; | |
374 | ||
375 | gas_assert (S_GET_SEGMENT (label) == now_seg); | |
376 | ||
377 | old_frag = symbol_get_frag (label); | |
378 | old_value = S_GET_VALUE (label); | |
379 | new_value = (valueT) frag_now_fix (); | |
380 | ||
381 | /* It is possible to have more than one label at a particular | |
382 | address, especially if debugging is enabled, so we must | |
383 | take care to adjust all the labels at this address in this | |
384 | fragment. To save time we search from the end of the symbol | |
385 | list, backwards, since the symbols we are interested in are | |
386 | almost certainly the ones that were most recently added. | |
387 | Also to save time we stop searching once we have seen at least | |
388 | one matching label, and we encounter a label that is no longer | |
389 | in the target fragment. Note, this search is guaranteed to | |
390 | find at least one match when sym == label, so no special case | |
391 | code is necessary. */ | |
392 | for (sym = symbol_lastP; sym != NULL; sym = symbol_previous (sym)) | |
393 | if (symbol_get_frag (sym) == old_frag | |
394 | && S_GET_VALUE (sym) == old_value) | |
395 | { | |
396 | label_seen = TRUE; | |
397 | symbol_set_frag (sym, frag_now); | |
398 | S_SET_VALUE (sym, new_value); | |
399 | } | |
400 | else if (label_seen && symbol_get_frag (sym) != old_frag) | |
401 | break; | |
402 | } | |
403 | record_alignment (now_seg, align); | |
404 | } | |
405 | } | |
406 | ||
407 | \f | |
408 | /** Support for self-check mode. */ | |
409 | ||
410 | /* Mode of the assembler. */ | |
411 | typedef enum | |
412 | { | |
413 | NIOS2_MODE_ASSEMBLE, /* Ordinary operation. */ | |
414 | NIOS2_MODE_TEST /* Hidden mode used for self testing. */ | |
415 | } NIOS2_MODE; | |
416 | ||
417 | static NIOS2_MODE nios2_mode = NIOS2_MODE_ASSEMBLE; | |
418 | ||
419 | /* This function is used to in self-checking mode | |
420 | to check the assembled instruction | |
421 | opcode should be the assembled opcode, and exp_opcode | |
422 | the parsed string representing the expected opcode. */ | |
423 | static void | |
424 | nios2_check_assembly (unsigned int opcode, const char *exp_opcode) | |
425 | { | |
426 | if (nios2_mode == NIOS2_MODE_TEST) | |
427 | { | |
428 | if (exp_opcode == NULL) | |
429 | as_bad (_("expecting opcode string in self test mode")); | |
430 | else if (opcode != strtoul (exp_opcode, NULL, 16)) | |
431 | as_bad (_("assembly 0x%08x, expected %s"), opcode, exp_opcode); | |
432 | } | |
433 | } | |
434 | ||
435 | \f | |
436 | /** Support for machine-dependent assembler directives. */ | |
437 | /* Handle the .align pseudo-op. This aligns to a power of two. It | |
438 | also adjusts any current instruction label. We treat this the same | |
439 | way the MIPS port does: .align 0 turns off auto alignment. */ | |
440 | static void | |
441 | s_nios2_align (int ignore ATTRIBUTE_UNUSED) | |
442 | { | |
443 | int align; | |
444 | char fill; | |
445 | const char *pfill = NULL; | |
446 | long max_alignment = 15; | |
447 | ||
448 | align = get_absolute_expression (); | |
449 | if (align > max_alignment) | |
450 | { | |
451 | align = max_alignment; | |
452 | as_bad (_("Alignment too large: %d. assumed"), align); | |
453 | } | |
454 | else if (align < 0) | |
455 | { | |
456 | as_warn (_("Alignment negative: 0 assumed")); | |
457 | align = 0; | |
458 | } | |
459 | ||
460 | if (*input_line_pointer == ',') | |
461 | { | |
462 | input_line_pointer++; | |
463 | fill = get_absolute_expression (); | |
464 | pfill = (const char *) &fill; | |
465 | } | |
466 | else if (subseg_text_p (now_seg)) | |
467 | pfill = (const char *) &nop; | |
468 | else | |
469 | { | |
470 | pfill = NULL; | |
471 | nios2_last_label = NULL; | |
472 | } | |
473 | ||
474 | if (align != 0) | |
475 | { | |
476 | nios2_auto_align_on = 1; | |
477 | nios2_align (align, pfill, nios2_last_label); | |
478 | nios2_last_label = NULL; | |
479 | } | |
480 | else | |
481 | nios2_auto_align_on = 0; | |
482 | ||
483 | demand_empty_rest_of_line (); | |
484 | } | |
485 | ||
486 | /* Handle the .text pseudo-op. This is like the usual one, but it | |
487 | clears the saved last label and resets known alignment. */ | |
488 | static void | |
489 | s_nios2_text (int i) | |
490 | { | |
491 | s_text (i); | |
492 | nios2_last_label = NULL; | |
493 | nios2_current_align = 0; | |
494 | nios2_current_align_seg = now_seg; | |
495 | } | |
496 | ||
497 | /* Handle the .data pseudo-op. This is like the usual one, but it | |
498 | clears the saved last label and resets known alignment. */ | |
499 | static void | |
500 | s_nios2_data (int i) | |
501 | { | |
502 | s_data (i); | |
503 | nios2_last_label = NULL; | |
504 | nios2_current_align = 0; | |
505 | nios2_current_align_seg = now_seg; | |
506 | } | |
507 | ||
508 | /* Handle the .section pseudo-op. This is like the usual one, but it | |
509 | clears the saved last label and resets known alignment. */ | |
510 | static void | |
511 | s_nios2_section (int ignore) | |
512 | { | |
513 | obj_elf_section (ignore); | |
514 | nios2_last_label = NULL; | |
515 | nios2_current_align = 0; | |
516 | nios2_current_align_seg = now_seg; | |
517 | } | |
518 | ||
519 | /* Explicitly unaligned cons. */ | |
520 | static void | |
521 | s_nios2_ucons (int nbytes) | |
522 | { | |
523 | int hold; | |
524 | hold = nios2_auto_align_on; | |
525 | nios2_auto_align_on = 0; | |
526 | cons (nbytes); | |
527 | nios2_auto_align_on = hold; | |
528 | } | |
529 | ||
530 | /* Handle the .sdata directive. */ | |
531 | static void | |
532 | s_nios2_sdata (int ignore ATTRIBUTE_UNUSED) | |
533 | { | |
534 | get_absolute_expression (); /* Ignored. */ | |
535 | subseg_new (".sdata", 0); | |
536 | demand_empty_rest_of_line (); | |
537 | } | |
538 | ||
539 | /* .set sets assembler options eg noat/at and is also used | |
540 | to set symbol values (.equ, .equiv ). */ | |
541 | static void | |
542 | s_nios2_set (int equiv) | |
543 | { | |
544 | char *directive = input_line_pointer; | |
545 | char delim = get_symbol_end (); | |
546 | char *endline = input_line_pointer; | |
547 | *endline = delim; | |
548 | ||
549 | /* We only want to handle ".set XXX" if the | |
550 | user has tried ".set XXX, YYY" they are not | |
551 | trying a directive. This prevents | |
552 | us from polluting the name space. */ | |
553 | SKIP_WHITESPACE (); | |
554 | if (is_end_of_line[(unsigned char) *input_line_pointer]) | |
555 | { | |
556 | bfd_boolean done = TRUE; | |
557 | *endline = 0; | |
558 | ||
559 | if (!strcmp (directive, "noat")) | |
560 | nios2_as_options.noat = TRUE; | |
561 | else if (!strcmp (directive, "at")) | |
562 | nios2_as_options.noat = FALSE; | |
563 | else if (!strcmp (directive, "nobreak")) | |
564 | nios2_as_options.nobreak = TRUE; | |
565 | else if (!strcmp (directive, "break")) | |
566 | nios2_as_options.nobreak = FALSE; | |
567 | else if (!strcmp (directive, "norelax")) | |
568 | nios2_as_options.relax = relax_none; | |
569 | else if (!strcmp (directive, "relaxsection")) | |
570 | nios2_as_options.relax = relax_section; | |
571 | else if (!strcmp (directive, "relaxall")) | |
572 | nios2_as_options.relax = relax_all; | |
573 | else | |
574 | done = FALSE; | |
575 | ||
576 | if (done) | |
577 | { | |
578 | *endline = delim; | |
579 | demand_empty_rest_of_line (); | |
580 | return; | |
581 | } | |
582 | } | |
583 | ||
584 | /* If we fall through to here, either we have ".set XXX, YYY" | |
585 | or we have ".set XXX" where XXX is unknown or we have | |
586 | a syntax error. */ | |
587 | input_line_pointer = directive; | |
588 | *endline = delim; | |
589 | s_set (equiv); | |
590 | } | |
591 | ||
592 | /* Machine-dependent assembler directives. | |
593 | Format of each entry is: | |
594 | { "directive", handler_func, param } */ | |
595 | const pseudo_typeS md_pseudo_table[] = { | |
596 | {"align", s_nios2_align, 0}, | |
597 | {"text", s_nios2_text, 0}, | |
598 | {"data", s_nios2_data, 0}, | |
599 | {"section", s_nios2_section, 0}, | |
600 | {"section.s", s_nios2_section, 0}, | |
601 | {"sect", s_nios2_section, 0}, | |
602 | {"sect.s", s_nios2_section, 0}, | |
603 | /* .dword and .half are included for compatibility with MIPS. */ | |
604 | {"dword", cons, 8}, | |
605 | {"half", cons, 2}, | |
606 | /* NIOS2 native word size is 4 bytes, so we override | |
607 | the GAS default of 2. */ | |
608 | {"word", cons, 4}, | |
609 | /* Explicitly unaligned directives. */ | |
610 | {"2byte", s_nios2_ucons, 2}, | |
611 | {"4byte", s_nios2_ucons, 4}, | |
612 | {"8byte", s_nios2_ucons, 8}, | |
613 | {"16byte", s_nios2_ucons, 16}, | |
614 | #ifdef OBJ_ELF | |
615 | {"sdata", s_nios2_sdata, 0}, | |
616 | #endif | |
617 | {"set", s_nios2_set, 0}, | |
618 | {NULL, NULL, 0} | |
619 | }; | |
620 | ||
621 | \f | |
622 | /** Relaxation support. */ | |
623 | ||
624 | /* We support two relaxation modes: a limited PC-relative mode with | |
625 | -relax-section (the default), and an absolute jump mode with -relax-all. | |
626 | ||
627 | Nios II PC-relative branch instructions only support 16-bit offsets. | |
628 | And, there's no good way to add a 32-bit constant to the PC without | |
629 | using two registers. | |
630 | ||
631 | To deal with this, for the pc-relative relaxation mode we convert | |
632 | br label | |
633 | into a series of 16-bit adds, like: | |
634 | nextpc at | |
635 | addi at, at, 32767 | |
636 | ... | |
637 | addi at, at, remainder | |
638 | jmp at | |
639 | ||
640 | Similarly, conditional branches are converted from | |
641 | b(condition) r, s, label | |
642 | into a series like: | |
643 | b(opposite condition) r, s, skip | |
644 | nextpc at | |
645 | addi at, at, 32767 | |
646 | ... | |
647 | addi at, at, remainder | |
648 | jmp at | |
649 | skip: | |
650 | ||
651 | The compiler can do a better job, either by converting the branch | |
652 | directly into a JMP (going through the GOT for PIC) or by allocating | |
653 | a second register for the 32-bit displacement. | |
654 | ||
655 | For the -relax-all relaxation mode, the conversions are | |
656 | movhi at, %hi(symbol+offset) | |
657 | ori at, %lo(symbol+offset) | |
658 | jmp at | |
659 | and | |
660 | b(opposite condition), r, s, skip | |
661 | movhi at, %hi(symbol+offset) | |
662 | ori at, %lo(symbol+offset) | |
663 | jmp at | |
664 | skip: | |
665 | respectively. | |
666 | */ | |
667 | ||
668 | /* Arbitrarily limit the number of addis we can insert; we need to be able | |
669 | to specify the maximum growth size for each frag that contains a | |
670 | relaxable branch. There's no point in specifying a huge number here | |
671 | since that means the assembler needs to allocate that much extra | |
672 | memory for every branch, and almost no real code will ever need it. | |
673 | Plus, as already noted a better solution is to just use a jmp, or | |
674 | allocate a second register to hold a 32-bit displacement. | |
675 | FIXME: Rather than making this a constant, it could be controlled by | |
676 | a command-line argument. */ | |
677 | #define RELAX_MAX_ADDI 32 | |
678 | ||
679 | /* The fr_subtype field represents the target-specific relocation state. | |
680 | It has type relax_substateT (unsigned int). We use it to track the | |
681 | number of addis necessary, plus a bit to track whether this is a | |
682 | conditional branch. | |
683 | Regardless of the smaller RELAX_MAX_ADDI limit, we reserve 16 bits | |
684 | in the fr_subtype to encode the number of addis so that the whole | |
685 | theoretically-valid range is representable. | |
686 | For the -relax-all mode, N = 0 represents an in-range branch and N = 1 | |
687 | represents a branch that needs to be relaxed. */ | |
688 | #define UBRANCH (0 << 16) | |
689 | #define CBRANCH (1 << 16) | |
690 | #define IS_CBRANCH(SUBTYPE) ((SUBTYPE) & CBRANCH) | |
691 | #define IS_UBRANCH(SUBTYPE) (!IS_CBRANCH (SUBTYPE)) | |
692 | #define UBRANCH_SUBTYPE(N) (UBRANCH | (N)) | |
693 | #define CBRANCH_SUBTYPE(N) (CBRANCH | (N)) | |
694 | #define SUBTYPE_ADDIS(SUBTYPE) ((SUBTYPE) & 0xffff) | |
695 | ||
696 | /* For the -relax-section mode, unconditional branches require 2 extra i | |
697 | nstructions besides the addis, conditional branches require 3. */ | |
698 | #define UBRANCH_ADDIS_TO_SIZE(N) (((N) + 2) * 4) | |
699 | #define CBRANCH_ADDIS_TO_SIZE(N) (((N) + 3) * 4) | |
700 | ||
701 | /* For the -relax-all mode, unconditional branches require 3 instructions | |
702 | and conditional branches require 4. */ | |
703 | #define UBRANCH_JUMP_SIZE 12 | |
704 | #define CBRANCH_JUMP_SIZE 16 | |
705 | ||
706 | /* Maximum sizes of relaxation sequences. */ | |
707 | #define UBRANCH_MAX_SIZE \ | |
708 | (nios2_as_options.relax == relax_all \ | |
709 | ? UBRANCH_JUMP_SIZE \ | |
710 | : UBRANCH_ADDIS_TO_SIZE (RELAX_MAX_ADDI)) | |
711 | #define CBRANCH_MAX_SIZE \ | |
712 | (nios2_as_options.relax == relax_all \ | |
713 | ? CBRANCH_JUMP_SIZE \ | |
714 | : CBRANCH_ADDIS_TO_SIZE (RELAX_MAX_ADDI)) | |
715 | ||
716 | /* Register number of AT, the assembler temporary. */ | |
717 | #define AT_REGNUM 1 | |
718 | ||
719 | /* Determine how many bytes are required to represent the sequence | |
720 | indicated by SUBTYPE. */ | |
721 | static int | |
722 | nios2_relax_subtype_size (relax_substateT subtype) | |
723 | { | |
724 | int n = SUBTYPE_ADDIS (subtype); | |
725 | if (n == 0) | |
726 | /* Regular conditional/unconditional branch instruction. */ | |
727 | return 4; | |
728 | else if (nios2_as_options.relax == relax_all) | |
729 | return (IS_CBRANCH (subtype) ? CBRANCH_JUMP_SIZE : UBRANCH_JUMP_SIZE); | |
730 | else if (IS_CBRANCH (subtype)) | |
731 | return CBRANCH_ADDIS_TO_SIZE (n); | |
732 | else | |
733 | return UBRANCH_ADDIS_TO_SIZE (n); | |
734 | } | |
735 | ||
736 | /* Estimate size of fragp before relaxation. | |
737 | This could also examine the offset in fragp and adjust | |
738 | fragp->fr_subtype, but we will do that in nios2_relax_frag anyway. */ | |
739 | int | |
740 | md_estimate_size_before_relax (fragS *fragp, segT segment ATTRIBUTE_UNUSED) | |
741 | { | |
742 | return nios2_relax_subtype_size (fragp->fr_subtype); | |
743 | } | |
744 | ||
745 | /* Implement md_relax_frag, returning the change in size of the frag. */ | |
746 | long | |
747 | nios2_relax_frag (segT segment, fragS *fragp, long stretch) | |
748 | { | |
749 | addressT target = fragp->fr_offset; | |
750 | relax_substateT subtype = fragp->fr_subtype; | |
751 | symbolS *symbolp = fragp->fr_symbol; | |
752 | ||
753 | if (symbolp) | |
754 | { | |
755 | fragS *sym_frag = symbol_get_frag (symbolp); | |
756 | offsetT offset; | |
757 | int n; | |
758 | ||
759 | target += S_GET_VALUE (symbolp); | |
760 | ||
761 | /* See comments in write.c:relax_frag about handling of stretch. */ | |
762 | if (stretch != 0 | |
763 | && sym_frag->relax_marker != fragp->relax_marker) | |
764 | { | |
765 | if (stretch < 0 || sym_frag->region == fragp->region) | |
766 | target += stretch; | |
767 | else if (target < fragp->fr_address) | |
768 | target = fragp->fr_next->fr_address + stretch; | |
769 | } | |
770 | ||
96ba4233 SL |
771 | /* We subtract fr_var (4 for 32-bit insns) because all pc relative |
772 | branches are from the next instruction. */ | |
773 | offset = target - fragp->fr_address - fragp->fr_fix - fragp->fr_var; | |
36591ba1 SL |
774 | if (offset >= -32768 && offset <= 32764) |
775 | /* Fits in PC-relative branch. */ | |
776 | n = 0; | |
777 | else if (nios2_as_options.relax == relax_all) | |
778 | /* Convert to jump. */ | |
779 | n = 1; | |
780 | else if (nios2_as_options.relax == relax_section | |
781 | && S_GET_SEGMENT (symbolp) == segment | |
782 | && S_IS_DEFINED (symbolp)) | |
783 | /* Attempt a PC-relative relaxation on a branch to a defined | |
784 | symbol in the same segment. */ | |
785 | { | |
786 | /* The relaxation for conditional branches is offset by 4 | |
787 | bytes because we insert the inverted branch around the | |
788 | sequence. */ | |
789 | if (IS_CBRANCH (subtype)) | |
790 | offset = offset - 4; | |
791 | if (offset > 0) | |
792 | n = offset / 32767 + 1; | |
793 | else | |
794 | n = offset / -32768 + 1; | |
795 | ||
796 | /* Bail out immediately if relaxation has failed. If we try to | |
797 | defer the diagnostic to md_convert_frag, some pathological test | |
798 | cases (e.g. gcc/testsuite/gcc.c-torture/compile/20001226-1.c) | |
799 | apparently never converge. By returning 0 here we could pretend | |
800 | to the caller that nothing has changed, but that leaves things | |
801 | in an inconsistent state when we get to md_convert_frag. */ | |
802 | if (n > RELAX_MAX_ADDI) | |
803 | { | |
804 | as_bad_where (fragp->fr_file, fragp->fr_line, | |
805 | _("branch offset out of range\n")); | |
806 | as_fatal (_("branch relaxation failed\n")); | |
807 | } | |
808 | } | |
809 | else | |
810 | /* We cannot handle this case, diagnose overflow later. */ | |
811 | return 0; | |
812 | ||
813 | if (IS_CBRANCH (subtype)) | |
814 | fragp->fr_subtype = CBRANCH_SUBTYPE (n); | |
815 | else | |
816 | fragp->fr_subtype = UBRANCH_SUBTYPE (n); | |
817 | ||
818 | return (nios2_relax_subtype_size (fragp->fr_subtype) | |
819 | - nios2_relax_subtype_size (subtype)); | |
820 | } | |
821 | ||
822 | /* If we got here, it's probably an error. */ | |
823 | return 0; | |
824 | } | |
825 | ||
826 | ||
827 | /* Complete fragp using the data from the relaxation pass. */ | |
828 | void | |
829 | md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED, | |
830 | fragS *fragp) | |
831 | { | |
832 | char *buffer = fragp->fr_literal + fragp->fr_fix; | |
833 | relax_substateT subtype = fragp->fr_subtype; | |
834 | int n = SUBTYPE_ADDIS (subtype); | |
835 | addressT target = fragp->fr_offset; | |
836 | symbolS *symbolp = fragp->fr_symbol; | |
837 | offsetT offset; | |
838 | unsigned int addend_mask, addi_mask; | |
839 | offsetT addend, remainder; | |
840 | int i; | |
841 | ||
842 | /* If we didn't or can't relax, this is a regular branch instruction. | |
843 | We just need to generate the fixup for the symbol and offset. */ | |
844 | if (n == 0) | |
845 | { | |
846 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, 1, | |
847 | BFD_RELOC_16_PCREL); | |
848 | fragp->fr_fix += 4; | |
849 | return; | |
850 | } | |
851 | ||
852 | /* Replace the cbranch at fr_fix with one that has the opposite condition | |
853 | in order to jump around the block of instructions we'll be adding. */ | |
854 | if (IS_CBRANCH (subtype)) | |
855 | { | |
856 | unsigned int br_opcode; | |
96ba4233 | 857 | unsigned int old_op, new_op; |
36591ba1 SL |
858 | int nbytes; |
859 | ||
860 | /* Account for the nextpc and jmp in the pc-relative case, or the two | |
861 | load instructions and jump in the absolute case. */ | |
862 | if (nios2_as_options.relax == relax_section) | |
863 | nbytes = (n + 2) * 4; | |
864 | else | |
865 | nbytes = 12; | |
866 | ||
867 | br_opcode = md_chars_to_number (buffer, 4); | |
96ba4233 SL |
868 | old_op = GET_IW_R1_OP (br_opcode); |
869 | switch (old_op) | |
36591ba1 | 870 | { |
96ba4233 SL |
871 | case R1_OP_BEQ: |
872 | new_op = R1_OP_BNE; | |
36591ba1 | 873 | break; |
96ba4233 SL |
874 | case R1_OP_BNE: |
875 | new_op = R1_OP_BEQ; | |
36591ba1 | 876 | break; |
96ba4233 SL |
877 | case R1_OP_BGE: |
878 | new_op = R1_OP_BLT; | |
36591ba1 | 879 | break; |
96ba4233 SL |
880 | case R1_OP_BGEU: |
881 | new_op = R1_OP_BLTU; | |
36591ba1 | 882 | break; |
96ba4233 SL |
883 | case R1_OP_BLT: |
884 | new_op = R1_OP_BGE; | |
36591ba1 | 885 | break; |
96ba4233 SL |
886 | case R1_OP_BLTU: |
887 | new_op = R1_OP_BGEU; | |
36591ba1 SL |
888 | break; |
889 | default: | |
890 | as_bad_where (fragp->fr_file, fragp->fr_line, | |
891 | _("expecting conditional branch for relaxation\n")); | |
892 | abort (); | |
893 | } | |
894 | ||
96ba4233 SL |
895 | br_opcode = (br_opcode & ~IW_R1_OP_SHIFTED_MASK) | SET_IW_R1_OP (new_op); |
896 | br_opcode = br_opcode | SET_IW_I_IMM16 (nbytes); | |
36591ba1 SL |
897 | md_number_to_chars (buffer, br_opcode, 4); |
898 | fragp->fr_fix += 4; | |
899 | buffer += 4; | |
900 | } | |
901 | ||
902 | /* Load at for the PC-relative case. */ | |
903 | if (nios2_as_options.relax == relax_section) | |
904 | { | |
905 | /* Insert the nextpc instruction. */ | |
906 | md_number_to_chars (buffer, | |
96ba4233 | 907 | MATCH_R1_NEXTPC | SET_IW_R_C (AT_REGNUM), 4); |
36591ba1 SL |
908 | fragp->fr_fix += 4; |
909 | buffer += 4; | |
910 | ||
911 | /* We need to know whether the offset is positive or negative. */ | |
912 | target += S_GET_VALUE (symbolp); | |
913 | offset = target - fragp->fr_address - fragp->fr_fix; | |
914 | if (offset > 0) | |
915 | addend = 32767; | |
916 | else | |
917 | addend = -32768; | |
96ba4233 | 918 | addend_mask = SET_IW_I_IMM16 ((unsigned int)addend); |
36591ba1 SL |
919 | |
920 | /* Insert n-1 addi instructions. */ | |
96ba4233 SL |
921 | addi_mask = (MATCH_R1_ADDI |
922 | | SET_IW_I_B (AT_REGNUM) | |
923 | | SET_IW_I_A (AT_REGNUM)); | |
36591ba1 SL |
924 | for (i = 0; i < n - 1; i ++) |
925 | { | |
926 | md_number_to_chars (buffer, addi_mask | addend_mask, 4); | |
927 | fragp->fr_fix += 4; | |
928 | buffer += 4; | |
929 | } | |
930 | ||
931 | /* Insert the last addi instruction to hold the remainder. */ | |
932 | remainder = offset - addend * (n - 1); | |
933 | gas_assert (remainder >= -32768 && remainder <= 32767); | |
96ba4233 | 934 | addend_mask = SET_IW_I_IMM16 ((unsigned int)remainder); |
36591ba1 SL |
935 | md_number_to_chars (buffer, addi_mask | addend_mask, 4); |
936 | fragp->fr_fix += 4; | |
937 | buffer += 4; | |
938 | } | |
939 | ||
940 | /* Load at for the absolute case. */ | |
941 | else | |
942 | { | |
96ba4233 SL |
943 | md_number_to_chars (buffer, |
944 | (MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM) | |
945 | | SET_IW_I_A (0)), | |
946 | 4); | |
36591ba1 SL |
947 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, |
948 | 0, BFD_RELOC_NIOS2_HI16); | |
949 | fragp->fr_fix += 4; | |
950 | buffer += 4; | |
96ba4233 SL |
951 | md_number_to_chars (buffer, |
952 | (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM) | |
953 | | SET_IW_I_A (AT_REGNUM)), | |
954 | 4); | |
36591ba1 SL |
955 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, |
956 | 0, BFD_RELOC_NIOS2_LO16); | |
957 | fragp->fr_fix += 4; | |
958 | buffer += 4; | |
959 | } | |
960 | ||
961 | /* Insert the jmp instruction. */ | |
96ba4233 | 962 | md_number_to_chars (buffer, MATCH_R1_JMP | SET_IW_R_A (AT_REGNUM), 4); |
36591ba1 SL |
963 | fragp->fr_fix += 4; |
964 | buffer += 4; | |
965 | } | |
966 | ||
967 | \f | |
968 | /** Fixups and overflow checking. */ | |
969 | ||
970 | /* Check a fixup for overflow. */ | |
971 | static bfd_boolean | |
972 | nios2_check_overflow (valueT fixup, reloc_howto_type *howto) | |
973 | { | |
974 | /* Apply the rightshift before checking for overflow. */ | |
975 | fixup = ((signed)fixup) >> howto->rightshift; | |
976 | ||
977 | /* Check for overflow - return TRUE if overflow, FALSE if not. */ | |
978 | switch (howto->complain_on_overflow) | |
979 | { | |
980 | case complain_overflow_dont: | |
981 | break; | |
982 | case complain_overflow_bitfield: | |
983 | if ((fixup >> howto->bitsize) != 0 | |
984 | && ((signed) fixup >> howto->bitsize) != -1) | |
985 | return TRUE; | |
986 | break; | |
987 | case complain_overflow_signed: | |
988 | if ((fixup & 0x80000000) > 0) | |
989 | { | |
990 | /* Check for negative overflow. */ | |
991 | if ((signed) fixup < ((signed) 0x80000000 >> howto->bitsize)) | |
992 | return TRUE; | |
993 | } | |
994 | else | |
995 | { | |
996 | /* Check for positive overflow. */ | |
997 | if (fixup >= ((unsigned) 1 << (howto->bitsize - 1))) | |
998 | return TRUE; | |
999 | } | |
1000 | break; | |
1001 | case complain_overflow_unsigned: | |
1002 | if ((fixup >> howto->bitsize) != 0) | |
1003 | return TRUE; | |
1004 | break; | |
1005 | default: | |
1006 | as_bad (_("error checking for overflow - broken assembler")); | |
1007 | break; | |
1008 | } | |
1009 | return FALSE; | |
1010 | } | |
1011 | ||
1012 | /* Emit diagnostic for fixup overflow. */ | |
1013 | static void | |
1014 | nios2_diagnose_overflow (valueT fixup, reloc_howto_type *howto, | |
1015 | fixS *fixP, valueT value) | |
1016 | { | |
1017 | if (fixP->fx_r_type == BFD_RELOC_8 | |
1018 | || fixP->fx_r_type == BFD_RELOC_16 | |
1019 | || fixP->fx_r_type == BFD_RELOC_32) | |
1020 | /* These relocs are against data, not instructions. */ | |
1021 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1022 | _("immediate value 0x%x truncated to 0x%x"), | |
1023 | (unsigned int) fixup, | |
1024 | (unsigned int) (~(~(valueT) 0 << howto->bitsize) & fixup)); | |
1025 | else | |
1026 | { | |
1027 | /* What opcode is the instruction? This will determine | |
1028 | whether we check for overflow in immediate values | |
1029 | and what error message we get. */ | |
1030 | const struct nios2_opcode *opcode; | |
1031 | enum overflow_type overflow_msg_type; | |
1032 | unsigned int range_min; | |
1033 | unsigned int range_max; | |
1034 | unsigned int address; | |
96ba4233 | 1035 | |
b4714c7c | 1036 | opcode = nios2_find_opcode_hash (value, bfd_get_mach (stdoutput)); |
36591ba1 | 1037 | gas_assert (opcode); |
96ba4233 | 1038 | gas_assert (fixP->fx_size == opcode->size); |
36591ba1 SL |
1039 | overflow_msg_type = opcode->overflow_msg; |
1040 | switch (overflow_msg_type) | |
1041 | { | |
1042 | case call_target_overflow: | |
1043 | range_min | |
1044 | = ((fixP->fx_frag->fr_address + fixP->fx_where) & 0xf0000000); | |
1045 | range_max = range_min + 0x0fffffff; | |
1046 | address = fixup | range_min; | |
1047 | ||
1048 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1049 | _("call target address 0x%08x out of range 0x%08x to 0x%08x"), | |
1050 | address, range_min, range_max); | |
1051 | break; | |
1052 | case branch_target_overflow: | |
1053 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1054 | _("branch offset %d out of range %d to %d"), | |
1055 | (int)fixup, -32768, 32767); | |
1056 | break; | |
1057 | case address_offset_overflow: | |
1058 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1059 | _("%s offset %d out of range %d to %d"), | |
1060 | opcode->name, (int)fixup, -32768, 32767); | |
1061 | break; | |
1062 | case signed_immed16_overflow: | |
1063 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1064 | _("immediate value %d out of range %d to %d"), | |
1065 | (int)fixup, -32768, 32767); | |
1066 | break; | |
1067 | case unsigned_immed16_overflow: | |
1068 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1069 | _("immediate value %u out of range %u to %u"), | |
1070 | (unsigned int)fixup, 0, 65535); | |
1071 | break; | |
1072 | case unsigned_immed5_overflow: | |
1073 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1074 | _("immediate value %u out of range %u to %u"), | |
1075 | (unsigned int)fixup, 0, 31); | |
1076 | break; | |
1077 | case custom_opcode_overflow: | |
1078 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1079 | _("custom instruction opcode %u out of range %u to %u"), | |
1080 | (unsigned int)fixup, 0, 255); | |
1081 | break; | |
1082 | default: | |
1083 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1084 | _("overflow in immediate argument")); | |
1085 | break; | |
1086 | } | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | /* Apply a fixup to the object file. */ | |
1091 | void | |
1092 | md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) | |
1093 | { | |
1094 | /* Assert that the fixup is one we can handle. */ | |
1095 | gas_assert (fixP != NULL && valP != NULL | |
1096 | && (fixP->fx_r_type == BFD_RELOC_8 | |
1097 | || fixP->fx_r_type == BFD_RELOC_16 | |
1098 | || fixP->fx_r_type == BFD_RELOC_32 | |
1099 | || fixP->fx_r_type == BFD_RELOC_64 | |
1100 | || fixP->fx_r_type == BFD_RELOC_NIOS2_S16 | |
1101 | || fixP->fx_r_type == BFD_RELOC_NIOS2_U16 | |
1102 | || fixP->fx_r_type == BFD_RELOC_16_PCREL | |
1103 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL26 | |
1104 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM5 | |
1105 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CACHE_OPX | |
1106 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM6 | |
1107 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM8 | |
1108 | || fixP->fx_r_type == BFD_RELOC_NIOS2_HI16 | |
1109 | || fixP->fx_r_type == BFD_RELOC_NIOS2_LO16 | |
1110 | || fixP->fx_r_type == BFD_RELOC_NIOS2_HIADJ16 | |
1111 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GPREL | |
1112 | || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT | |
1113 | || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY | |
1114 | || fixP->fx_r_type == BFD_RELOC_NIOS2_UJMP | |
1115 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CJMP | |
1116 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALLR | |
1117 | || fixP->fx_r_type == BFD_RELOC_NIOS2_ALIGN | |
1118 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT16 | |
1119 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL16 | |
1120 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_LO | |
1121 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_HA | |
1122 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_GD16 | |
1123 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LDM16 | |
1124 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LDO16 | |
1125 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_IE16 | |
1126 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LE16 | |
1127 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF | |
1128 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPREL | |
1c2de463 SL |
1129 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL26_NOAT |
1130 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT_LO | |
1131 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT_HA | |
1132 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL_LO | |
1133 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL_HA | |
36591ba1 SL |
1134 | /* Add other relocs here as we generate them. */ |
1135 | )); | |
1136 | ||
1137 | if (fixP->fx_r_type == BFD_RELOC_64) | |
1138 | { | |
1139 | /* We may reach here due to .8byte directives, but we never output | |
1140 | BFD_RELOC_64; it must be resolved. */ | |
1141 | if (fixP->fx_addsy != NULL) | |
1142 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1143 | _("cannot create 64-bit relocation")); | |
1144 | else | |
1145 | { | |
1146 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, | |
1147 | *valP, 8); | |
1148 | fixP->fx_done = 1; | |
1149 | } | |
1150 | return; | |
1151 | } | |
1152 | ||
1153 | /* The value passed in valP can be the value of a fully | |
1154 | resolved expression, or it can be the value of a partially | |
1155 | resolved expression. In the former case, both fixP->fx_addsy | |
1156 | and fixP->fx_subsy are NULL, and fixP->fx_offset == *valP, and | |
1157 | we can fix up the instruction that fixP relates to. | |
1158 | In the latter case, one or both of fixP->fx_addsy and | |
1159 | fixP->fx_subsy are not NULL, and fixP->fx_offset may or may not | |
1160 | equal *valP. We don't need to check for fixP->fx_subsy being null | |
1161 | because the generic part of the assembler generates an error if | |
1162 | it is not an absolute symbol. */ | |
1163 | if (fixP->fx_addsy != NULL) | |
1164 | /* Partially resolved expression. */ | |
1165 | { | |
1166 | fixP->fx_addnumber = fixP->fx_offset; | |
1167 | fixP->fx_done = 0; | |
1168 | ||
1169 | switch (fixP->fx_r_type) | |
1170 | { | |
1171 | case BFD_RELOC_NIOS2_TLS_GD16: | |
1172 | case BFD_RELOC_NIOS2_TLS_LDM16: | |
1173 | case BFD_RELOC_NIOS2_TLS_LDO16: | |
1174 | case BFD_RELOC_NIOS2_TLS_IE16: | |
1175 | case BFD_RELOC_NIOS2_TLS_LE16: | |
1176 | case BFD_RELOC_NIOS2_TLS_DTPMOD: | |
1177 | case BFD_RELOC_NIOS2_TLS_DTPREL: | |
1178 | case BFD_RELOC_NIOS2_TLS_TPREL: | |
1179 | S_SET_THREAD_LOCAL (fixP->fx_addsy); | |
1180 | break; | |
1181 | default: | |
1182 | break; | |
1183 | } | |
1184 | } | |
1185 | else | |
1186 | /* Fully resolved fixup. */ | |
1187 | { | |
1188 | reloc_howto_type *howto | |
1189 | = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); | |
1190 | ||
1191 | if (howto == NULL) | |
1192 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1193 | _("relocation is not supported")); | |
1194 | else | |
1195 | { | |
1196 | valueT fixup = *valP; | |
1197 | valueT value; | |
1198 | char *buf; | |
1199 | ||
1200 | /* If this is a pc-relative relocation, we need to | |
1201 | subtract the current offset within the object file | |
1202 | FIXME : for some reason fixP->fx_pcrel isn't 1 when it should be | |
1203 | so I'm using the howto structure instead to determine this. */ | |
1204 | if (howto->pc_relative == 1) | |
96ba4233 SL |
1205 | fixup = fixup - (fixP->fx_frag->fr_address + fixP->fx_where |
1206 | + fixP->fx_size); | |
36591ba1 SL |
1207 | |
1208 | /* Get the instruction or data to be fixed up. */ | |
1209 | buf = fixP->fx_frag->fr_literal + fixP->fx_where; | |
1210 | value = md_chars_to_number (buf, fixP->fx_size); | |
1211 | ||
1212 | /* Check for overflow, emitting a diagnostic if necessary. */ | |
1213 | if (nios2_check_overflow (fixup, howto)) | |
1214 | nios2_diagnose_overflow (fixup, howto, fixP, value); | |
1215 | ||
1216 | /* Apply the right shift. */ | |
1217 | fixup = ((signed)fixup) >> howto->rightshift; | |
1218 | ||
1219 | /* Truncate the fixup to right size. */ | |
1220 | switch (fixP->fx_r_type) | |
1221 | { | |
1222 | case BFD_RELOC_NIOS2_HI16: | |
1223 | fixup = (fixup >> 16) & 0xFFFF; | |
1224 | break; | |
1225 | case BFD_RELOC_NIOS2_LO16: | |
1226 | fixup = fixup & 0xFFFF; | |
1227 | break; | |
1228 | case BFD_RELOC_NIOS2_HIADJ16: | |
5d5755a7 SL |
1229 | fixup = ((((fixup >> 16) & 0xFFFF) + ((fixup >> 15) & 0x01)) |
1230 | & 0xFFFF); | |
36591ba1 SL |
1231 | break; |
1232 | default: | |
1233 | { | |
1234 | int n = sizeof (fixup) * 8 - howto->bitsize; | |
1235 | fixup = (fixup << n) >> n; | |
1236 | break; | |
1237 | } | |
1238 | } | |
1239 | ||
1240 | /* Fix up the instruction. */ | |
1241 | value = (value & ~howto->dst_mask) | (fixup << howto->bitpos); | |
1242 | md_number_to_chars (buf, value, fixP->fx_size); | |
1243 | } | |
1244 | ||
1245 | fixP->fx_done = 1; | |
1246 | } | |
1247 | ||
1248 | if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) | |
1249 | { | |
1250 | fixP->fx_done = 0; | |
1251 | if (fixP->fx_addsy | |
1252 | && !S_IS_DEFINED (fixP->fx_addsy) && !S_IS_WEAK (fixP->fx_addsy)) | |
1253 | S_SET_WEAK (fixP->fx_addsy); | |
1254 | } | |
1255 | else if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) | |
1256 | fixP->fx_done = 0; | |
1257 | } | |
1258 | ||
1259 | ||
1260 | \f | |
1261 | /** Instruction parsing support. */ | |
1262 | ||
96ba4233 SL |
1263 | /* General internal error routine. */ |
1264 | ||
1265 | static void | |
1266 | bad_opcode (const struct nios2_opcode *op) | |
1267 | { | |
1268 | fprintf (stderr, _("internal error: broken opcode descriptor for `%s %s'\n"), | |
1269 | op->name, op->args); | |
1270 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
1271 | } | |
1272 | ||
36591ba1 SL |
1273 | /* Special relocation directive strings. */ |
1274 | ||
1275 | struct nios2_special_relocS | |
1276 | { | |
1277 | const char *string; | |
1278 | bfd_reloc_code_real_type reloc_type; | |
1279 | }; | |
1280 | ||
1c2de463 SL |
1281 | /* This table is sorted so that prefix strings are listed after the longer |
1282 | strings that include them -- e.g., %got after %got_hiadj, etc. */ | |
1283 | ||
36591ba1 SL |
1284 | struct nios2_special_relocS nios2_special_reloc[] = { |
1285 | {"%hiadj", BFD_RELOC_NIOS2_HIADJ16}, | |
1286 | {"%hi", BFD_RELOC_NIOS2_HI16}, | |
1287 | {"%lo", BFD_RELOC_NIOS2_LO16}, | |
1288 | {"%gprel", BFD_RELOC_NIOS2_GPREL}, | |
1c2de463 SL |
1289 | {"%call_lo", BFD_RELOC_NIOS2_CALL_LO}, |
1290 | {"%call_hiadj", BFD_RELOC_NIOS2_CALL_HA}, | |
36591ba1 SL |
1291 | {"%call", BFD_RELOC_NIOS2_CALL16}, |
1292 | {"%gotoff_lo", BFD_RELOC_NIOS2_GOTOFF_LO}, | |
1293 | {"%gotoff_hiadj", BFD_RELOC_NIOS2_GOTOFF_HA}, | |
1c2de463 SL |
1294 | {"%gotoff", BFD_RELOC_NIOS2_GOTOFF}, |
1295 | {"%got_hiadj", BFD_RELOC_NIOS2_GOT_HA}, | |
1296 | {"%got_lo", BFD_RELOC_NIOS2_GOT_LO}, | |
1297 | {"%got", BFD_RELOC_NIOS2_GOT16}, | |
36591ba1 SL |
1298 | {"%tls_gd", BFD_RELOC_NIOS2_TLS_GD16}, |
1299 | {"%tls_ldm", BFD_RELOC_NIOS2_TLS_LDM16}, | |
1300 | {"%tls_ldo", BFD_RELOC_NIOS2_TLS_LDO16}, | |
1301 | {"%tls_ie", BFD_RELOC_NIOS2_TLS_IE16}, | |
1302 | {"%tls_le", BFD_RELOC_NIOS2_TLS_LE16}, | |
36591ba1 SL |
1303 | }; |
1304 | ||
1305 | #define NIOS2_NUM_SPECIAL_RELOCS \ | |
1306 | (sizeof(nios2_special_reloc)/sizeof(nios2_special_reloc[0])) | |
1307 | const int nios2_num_special_relocs = NIOS2_NUM_SPECIAL_RELOCS; | |
1308 | ||
1309 | /* Creates a new nios2_insn_relocS and returns a pointer to it. */ | |
1310 | static nios2_insn_relocS * | |
1311 | nios2_insn_reloc_new (bfd_reloc_code_real_type reloc_type, unsigned int pcrel) | |
1312 | { | |
1313 | nios2_insn_relocS *retval; | |
1314 | retval = (nios2_insn_relocS *) malloc (sizeof (nios2_insn_relocS)); | |
1315 | if (retval == NULL) | |
1316 | { | |
1317 | as_bad (_("can't create relocation")); | |
1318 | abort (); | |
1319 | } | |
1320 | ||
1321 | /* Fill out the fields with default values. */ | |
1322 | retval->reloc_next = NULL; | |
1323 | retval->reloc_type = reloc_type; | |
1324 | retval->reloc_pcrel = pcrel; | |
1325 | return retval; | |
1326 | } | |
1327 | ||
1328 | /* Frees up memory previously allocated by nios2_insn_reloc_new(). */ | |
1329 | /* FIXME: this is never called; memory leak? */ | |
1330 | #if 0 | |
1331 | static void | |
1332 | nios2_insn_reloc_destroy (nios2_insn_relocS *reloc) | |
1333 | { | |
1334 | gas_assert (reloc != NULL); | |
1335 | free (reloc); | |
1336 | } | |
1337 | #endif | |
1338 | ||
96ba4233 SL |
1339 | /* Look up a register name and validate it for the given regtype. |
1340 | Return the register mapping or NULL on failure. */ | |
1341 | static struct nios2_reg * | |
1342 | nios2_parse_reg (const char *token, unsigned long regtype) | |
1343 | { | |
1344 | struct nios2_reg *reg = nios2_reg_lookup (token); | |
1345 | ||
1346 | if (reg == NULL) | |
1347 | { | |
1348 | as_bad (_("unknown register %s"), token); | |
1349 | return NULL; | |
1350 | } | |
1351 | ||
1352 | /* Matched a register, but is it the wrong type? */ | |
1353 | if (!(regtype & reg->regtype)) | |
1354 | { | |
1355 | if (regtype & REG_CONTROL) | |
1356 | as_bad (_("expecting control register")); | |
1357 | else if (reg->regtype & REG_CONTROL) | |
1358 | as_bad (_("illegal use of control register")); | |
1359 | else if (reg->regtype & REG_COPROCESSOR) | |
1360 | as_bad (_("illegal use of coprocessor register")); | |
1361 | else | |
1362 | as_bad (_("invalid register %s"), token); | |
1363 | return NULL; | |
1364 | } | |
1365 | ||
1366 | /* Warn for explicit use of special registers. */ | |
1367 | if (reg->regtype & REG_NORMAL) | |
1368 | { | |
1369 | if (!nios2_as_options.noat && reg->index == 1) | |
1370 | as_warn (_("Register at (r1) can sometimes be corrupted by " | |
1371 | "assembler optimizations.\n" | |
1372 | "Use .set noat to turn off those optimizations " | |
1373 | "(and this warning).")); | |
1374 | if (!nios2_as_options.nobreak && reg->index == 25) | |
1375 | as_warn (_("The debugger will corrupt bt (r25).\n" | |
1376 | "If you don't need to debug this " | |
1377 | "code use .set nobreak to turn off this warning.")); | |
1378 | if (!nios2_as_options.nobreak && reg->index == 30) | |
1379 | as_warn (_("The debugger will corrupt sstatus/ba (r30).\n" | |
1380 | "If you don't need to debug this " | |
1381 | "code use .set nobreak to turn off this warning.")); | |
1382 | } | |
1383 | ||
1384 | return reg; | |
1385 | } | |
1386 | ||
36591ba1 SL |
1387 | /* The various nios2_assemble_* functions call this |
1388 | function to generate an expression from a string representing an expression. | |
1389 | It then tries to evaluate the expression, and if it can, returns its value. | |
1390 | If not, it creates a new nios2_insn_relocS and stores the expression and | |
1391 | reloc_type for future use. */ | |
1392 | static unsigned long | |
1393 | nios2_assemble_expression (const char *exprstr, | |
1394 | nios2_insn_infoS *insn, | |
36591ba1 SL |
1395 | bfd_reloc_code_real_type reloc_type, |
1396 | unsigned int pcrel) | |
1397 | { | |
1398 | nios2_insn_relocS *reloc; | |
1399 | char *saved_line_ptr; | |
1400 | unsigned short value; | |
1401 | int i; | |
1402 | ||
1403 | gas_assert (exprstr != NULL); | |
1404 | gas_assert (insn != NULL); | |
1405 | ||
1406 | /* Check for relocation operators. | |
1407 | Change the relocation type and advance the ptr to the start of | |
1408 | the expression proper. */ | |
1409 | for (i = 0; i < nios2_num_special_relocs; i++) | |
1410 | if (strstr (exprstr, nios2_special_reloc[i].string) != NULL) | |
1411 | { | |
1412 | reloc_type = nios2_special_reloc[i].reloc_type; | |
1413 | exprstr += strlen (nios2_special_reloc[i].string) + 1; | |
1414 | ||
1415 | /* %lo and %hiadj have different meanings for PC-relative | |
1416 | expressions. */ | |
1417 | if (pcrel) | |
1418 | { | |
1419 | if (reloc_type == BFD_RELOC_NIOS2_LO16) | |
1420 | reloc_type = BFD_RELOC_NIOS2_PCREL_LO; | |
1421 | if (reloc_type == BFD_RELOC_NIOS2_HIADJ16) | |
1422 | reloc_type = BFD_RELOC_NIOS2_PCREL_HA; | |
1423 | } | |
1424 | ||
1425 | break; | |
1426 | } | |
1427 | ||
1428 | /* We potentially have a relocation. */ | |
1429 | reloc = nios2_insn_reloc_new (reloc_type, pcrel); | |
96ba4233 SL |
1430 | reloc->reloc_next = insn->insn_reloc; |
1431 | insn->insn_reloc = reloc; | |
36591ba1 SL |
1432 | |
1433 | /* Parse the expression string. */ | |
1434 | saved_line_ptr = input_line_pointer; | |
1435 | input_line_pointer = (char *) exprstr; | |
1436 | expression (&reloc->reloc_expression); | |
1437 | input_line_pointer = saved_line_ptr; | |
1438 | ||
1439 | /* This is redundant as the fixup will put this into | |
1440 | the instruction, but it is included here so that | |
1441 | self-test mode (-r) works. */ | |
1442 | value = 0; | |
1443 | if (nios2_mode == NIOS2_MODE_TEST | |
1444 | && reloc->reloc_expression.X_op == O_constant) | |
1445 | value = reloc->reloc_expression.X_add_number; | |
1446 | ||
1447 | return (unsigned long) value; | |
1448 | } | |
1449 | ||
36591ba1 | 1450 | |
96ba4233 SL |
1451 | /* Argument assemble functions. */ |
1452 | static void | |
1453 | nios2_assemble_arg_c (const char *token, nios2_insn_infoS *insn) | |
36591ba1 | 1454 | { |
96ba4233 SL |
1455 | struct nios2_reg *reg = nios2_parse_reg (token, REG_CONTROL); |
1456 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
36591ba1 | 1457 | |
96ba4233 SL |
1458 | if (reg == NULL) |
1459 | return; | |
36591ba1 | 1460 | |
96ba4233 SL |
1461 | switch (op->format) |
1462 | { | |
1463 | case iw_r_type: | |
1464 | insn->insn_code |= SET_IW_R_IMM5 (reg->index); | |
1465 | break; | |
1466 | default: | |
1467 | bad_opcode (op); | |
36591ba1 SL |
1468 | } |
1469 | } | |
1470 | ||
96ba4233 SL |
1471 | static void |
1472 | nios2_assemble_arg_d (const char *token, nios2_insn_infoS *insn) | |
36591ba1 | 1473 | { |
96ba4233 SL |
1474 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1475 | unsigned long regtype = REG_NORMAL; | |
1476 | struct nios2_reg *reg; | |
36591ba1 | 1477 | |
96ba4233 SL |
1478 | if (op->format == iw_custom_type) |
1479 | regtype |= REG_COPROCESSOR; | |
1480 | reg = nios2_parse_reg (token, regtype); | |
1481 | if (reg == NULL) | |
1482 | return; | |
36591ba1 | 1483 | |
96ba4233 | 1484 | switch (op->format) |
36591ba1 | 1485 | { |
96ba4233 SL |
1486 | case iw_r_type: |
1487 | insn->insn_code |= SET_IW_R_C (reg->index); | |
1488 | break; | |
1489 | case iw_custom_type: | |
1490 | insn->insn_code |= SET_IW_CUSTOM_C (reg->index); | |
1491 | if (reg->regtype & REG_COPROCESSOR) | |
1492 | insn->insn_code |= SET_IW_CUSTOM_READC (0); | |
36591ba1 | 1493 | else |
96ba4233 SL |
1494 | insn->insn_code |= SET_IW_CUSTOM_READC (1); |
1495 | break; | |
1496 | default: | |
1497 | bad_opcode (op); | |
36591ba1 SL |
1498 | } |
1499 | } | |
1500 | ||
96ba4233 SL |
1501 | static void |
1502 | nios2_assemble_arg_s (const char *token, nios2_insn_infoS *insn) | |
36591ba1 | 1503 | { |
96ba4233 SL |
1504 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1505 | unsigned long regtype = REG_NORMAL; | |
1506 | struct nios2_reg *reg; | |
36591ba1 | 1507 | |
96ba4233 SL |
1508 | if (op->format == iw_custom_type) |
1509 | regtype |= REG_COPROCESSOR; | |
1510 | reg = nios2_parse_reg (token, regtype); | |
1511 | if (reg == NULL) | |
1512 | return; | |
36591ba1 | 1513 | |
96ba4233 | 1514 | switch (op->format) |
36591ba1 | 1515 | { |
96ba4233 SL |
1516 | case iw_r_type: |
1517 | insn->insn_code |= SET_IW_R_A (reg->index); | |
1518 | break; | |
1519 | case iw_i_type: | |
1520 | insn->insn_code |= SET_IW_I_A (reg->index); | |
1521 | break; | |
1522 | case iw_custom_type: | |
1523 | insn->insn_code |= SET_IW_CUSTOM_A (reg->index); | |
1524 | if (reg->regtype & REG_COPROCESSOR) | |
1525 | insn->insn_code |= SET_IW_CUSTOM_READA (0); | |
1526 | else | |
1527 | insn->insn_code |= SET_IW_CUSTOM_READA (1); | |
1528 | break; | |
1529 | default: | |
1530 | bad_opcode (op); | |
36591ba1 SL |
1531 | } |
1532 | } | |
1533 | ||
96ba4233 SL |
1534 | static void |
1535 | nios2_assemble_arg_t (const char *token, nios2_insn_infoS *insn) | |
36591ba1 | 1536 | { |
96ba4233 SL |
1537 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1538 | unsigned long regtype = REG_NORMAL; | |
1539 | struct nios2_reg *reg; | |
36591ba1 | 1540 | |
96ba4233 SL |
1541 | if (op->format == iw_custom_type) |
1542 | regtype |= REG_COPROCESSOR; | |
1543 | reg = nios2_parse_reg (token, regtype); | |
1544 | if (reg == NULL) | |
1545 | return; | |
36591ba1 | 1546 | |
96ba4233 SL |
1547 | switch (op->format) |
1548 | { | |
1549 | case iw_r_type: | |
1550 | insn->insn_code |= SET_IW_R_B (reg->index); | |
1551 | break; | |
1552 | case iw_i_type: | |
1553 | insn->insn_code |= SET_IW_I_B (reg->index); | |
1554 | break; | |
1555 | case iw_custom_type: | |
1556 | insn->insn_code |= SET_IW_CUSTOM_B (reg->index); | |
1557 | if (reg->regtype & REG_COPROCESSOR) | |
1558 | insn->insn_code |= SET_IW_CUSTOM_READB (0); | |
36591ba1 | 1559 | else |
96ba4233 SL |
1560 | insn->insn_code |= SET_IW_CUSTOM_READB (1); |
1561 | break; | |
1562 | default: | |
1563 | bad_opcode (op); | |
36591ba1 SL |
1564 | } |
1565 | } | |
1566 | ||
96ba4233 SL |
1567 | static void |
1568 | nios2_assemble_arg_i (const char *token, nios2_insn_infoS *insn) | |
36591ba1 | 1569 | { |
96ba4233 SL |
1570 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1571 | unsigned int val; | |
36591ba1 | 1572 | |
96ba4233 | 1573 | switch (op->format) |
36591ba1 | 1574 | { |
96ba4233 SL |
1575 | case iw_i_type: |
1576 | val = nios2_assemble_expression (token, insn, | |
1577 | BFD_RELOC_NIOS2_S16, 0); | |
1578 | insn->constant_bits |= SET_IW_I_IMM16 (val); | |
1579 | break; | |
1580 | default: | |
1581 | bad_opcode (op); | |
36591ba1 SL |
1582 | } |
1583 | } | |
1584 | ||
96ba4233 SL |
1585 | static void |
1586 | nios2_assemble_arg_u (const char *token, nios2_insn_infoS *insn) | |
36591ba1 | 1587 | { |
96ba4233 SL |
1588 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1589 | unsigned int val; | |
36591ba1 | 1590 | |
96ba4233 | 1591 | switch (op->format) |
36591ba1 | 1592 | { |
96ba4233 SL |
1593 | case iw_i_type: |
1594 | val = nios2_assemble_expression (token, insn, | |
1595 | BFD_RELOC_NIOS2_U16, 0); | |
1596 | insn->constant_bits |= SET_IW_I_IMM16 (val); | |
1597 | break; | |
1598 | default: | |
1599 | bad_opcode (op); | |
36591ba1 SL |
1600 | } |
1601 | } | |
1602 | ||
96ba4233 SL |
1603 | static void |
1604 | nios2_assemble_arg_o (const char *token, nios2_insn_infoS *insn) | |
36591ba1 | 1605 | { |
96ba4233 SL |
1606 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1607 | unsigned int val; | |
36591ba1 | 1608 | |
96ba4233 SL |
1609 | switch (op->format) |
1610 | { | |
1611 | case iw_i_type: | |
1612 | val = nios2_assemble_expression (token, insn, | |
1613 | BFD_RELOC_16_PCREL, 1); | |
1614 | insn->constant_bits |= SET_IW_I_IMM16 (val); | |
1615 | break; | |
1616 | default: | |
1617 | bad_opcode (op); | |
36591ba1 SL |
1618 | } |
1619 | } | |
1620 | ||
96ba4233 SL |
1621 | static void |
1622 | nios2_assemble_arg_j (const char *token, nios2_insn_infoS *insn) | |
dad60f8e | 1623 | { |
96ba4233 SL |
1624 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1625 | unsigned int val; | |
dad60f8e | 1626 | |
96ba4233 SL |
1627 | switch (op->format) |
1628 | { | |
1629 | case iw_r_type: | |
1630 | val = nios2_assemble_expression (token, insn, | |
1631 | BFD_RELOC_NIOS2_IMM5, 0); | |
1632 | insn->constant_bits |= SET_IW_R_IMM5 (val); | |
1633 | break; | |
1634 | default: | |
1635 | bad_opcode (op); | |
dad60f8e SL |
1636 | } |
1637 | } | |
1638 | ||
96ba4233 SL |
1639 | static void |
1640 | nios2_assemble_arg_l (const char *token, nios2_insn_infoS *insn) | |
36591ba1 | 1641 | { |
96ba4233 SL |
1642 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1643 | unsigned int val; | |
36591ba1 | 1644 | |
96ba4233 SL |
1645 | switch (op->format) |
1646 | { | |
1647 | case iw_custom_type: | |
1648 | val = nios2_assemble_expression (token, insn, | |
1649 | BFD_RELOC_NIOS2_IMM8, 0); | |
1650 | insn->constant_bits |= SET_IW_CUSTOM_N (val); | |
1651 | break; | |
1652 | default: | |
1653 | bad_opcode (op); | |
36591ba1 SL |
1654 | } |
1655 | } | |
1656 | ||
96ba4233 SL |
1657 | static void |
1658 | nios2_assemble_arg_m (const char *token, nios2_insn_infoS *insn) | |
36591ba1 | 1659 | { |
96ba4233 SL |
1660 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1661 | unsigned int val; | |
36591ba1 | 1662 | |
96ba4233 | 1663 | switch (op->format) |
36591ba1 | 1664 | { |
96ba4233 SL |
1665 | case iw_j_type: |
1666 | val = nios2_assemble_expression (token, insn, | |
1667 | (nios2_as_options.noat | |
1668 | ? BFD_RELOC_NIOS2_CALL26_NOAT | |
1669 | : BFD_RELOC_NIOS2_CALL26), | |
1670 | 0); | |
1671 | insn->constant_bits |= SET_IW_J_IMM26 (val); | |
1672 | break; | |
1673 | default: | |
1674 | bad_opcode (op); | |
36591ba1 SL |
1675 | } |
1676 | } | |
1677 | ||
1678 | static void | |
96ba4233 | 1679 | nios2_assemble_args (nios2_insn_infoS *insn) |
36591ba1 | 1680 | { |
96ba4233 SL |
1681 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1682 | const char *argptr; | |
1683 | unsigned int tokidx, ntok; | |
36591ba1 | 1684 | |
96ba4233 SL |
1685 | /* Make sure there are enough arguments. */ |
1686 | ntok = (op->pinfo & NIOS2_INSN_OPTARG) ? op->num_args - 1 : op->num_args; | |
1687 | for (tokidx = 1; tokidx <= ntok; tokidx++) | |
1688 | if (insn->insn_tokens[tokidx] == NULL) | |
1689 | { | |
1690 | as_bad ("missing argument"); | |
1691 | return; | |
1692 | } | |
36591ba1 | 1693 | |
96ba4233 SL |
1694 | for (argptr = op->args, tokidx = 1; |
1695 | *argptr && insn->insn_tokens[tokidx]; | |
1696 | argptr++) | |
1697 | switch (*argptr) | |
1698 | { | |
1699 | case ',': | |
1700 | case '(': | |
1701 | case ')': | |
1702 | break; | |
36591ba1 | 1703 | |
96ba4233 SL |
1704 | case 'c': |
1705 | nios2_assemble_arg_c (insn->insn_tokens[tokidx++], insn); | |
1706 | break; | |
1707 | ||
1708 | case 'd': | |
1709 | nios2_assemble_arg_d (insn->insn_tokens[tokidx++], insn); | |
1710 | break; | |
1711 | ||
1712 | case 's': | |
1713 | nios2_assemble_arg_s (insn->insn_tokens[tokidx++], insn); | |
1714 | break; | |
1715 | ||
1716 | case 't': | |
1717 | nios2_assemble_arg_t (insn->insn_tokens[tokidx++], insn); | |
1718 | break; | |
1719 | ||
1720 | case 'i': | |
1721 | nios2_assemble_arg_i (insn->insn_tokens[tokidx++], insn); | |
1722 | break; | |
1723 | ||
1724 | case 'u': | |
1725 | nios2_assemble_arg_u (insn->insn_tokens[tokidx++], insn); | |
1726 | break; | |
1727 | ||
1728 | case 'o': | |
1729 | nios2_assemble_arg_o (insn->insn_tokens[tokidx++], insn); | |
1730 | break; | |
1731 | ||
1732 | case 'j': | |
1733 | nios2_assemble_arg_j (insn->insn_tokens[tokidx++], insn); | |
1734 | break; | |
1735 | ||
1736 | case 'l': | |
1737 | nios2_assemble_arg_l (insn->insn_tokens[tokidx++], insn); | |
1738 | break; | |
1739 | ||
1740 | case 'm': | |
1741 | nios2_assemble_arg_m (insn->insn_tokens[tokidx++], insn); | |
1742 | break; | |
1743 | ||
1744 | default: | |
1745 | bad_opcode (op); | |
1746 | break; | |
1747 | } | |
36591ba1 | 1748 | |
96ba4233 SL |
1749 | /* Perform argument checking. */ |
1750 | nios2_check_assembly (insn->insn_code | insn->constant_bits, | |
1751 | insn->insn_tokens[tokidx]); | |
1752 | } | |
36591ba1 | 1753 | |
36591ba1 SL |
1754 | |
1755 | /* The function consume_arg takes a pointer into a string | |
1756 | of instruction tokens (args) and a pointer into a string | |
1757 | representing the expected sequence of tokens and separators. | |
1758 | It checks whether the first argument in argstr is of the | |
1759 | expected type, throwing an error if it is not, and returns | |
1760 | the pointer argstr. */ | |
1761 | static char * | |
96ba4233 | 1762 | nios2_consume_arg (char *argstr, const char *parsestr) |
36591ba1 SL |
1763 | { |
1764 | char *temp; | |
36591ba1 SL |
1765 | |
1766 | switch (*parsestr) | |
1767 | { | |
1768 | case 'c': | |
36591ba1 SL |
1769 | case 'd': |
1770 | case 's': | |
1771 | case 't': | |
36591ba1 | 1772 | break; |
96ba4233 | 1773 | |
36591ba1 SL |
1774 | case 'i': |
1775 | case 'u': | |
1776 | if (*argstr == '%') | |
1777 | { | |
1778 | if (nios2_special_relocation_p (argstr)) | |
1779 | { | |
1780 | /* We zap the parentheses because we don't want them confused | |
1781 | with separators. */ | |
1782 | temp = strchr (argstr, '('); | |
1783 | if (temp != NULL) | |
1784 | *temp = ' '; | |
1785 | temp = strchr (argstr, ')'); | |
1786 | if (temp != NULL) | |
1787 | *temp = ' '; | |
1788 | } | |
1789 | else | |
1790 | as_bad (_("badly formed expression near %s"), argstr); | |
1791 | } | |
1792 | break; | |
1793 | case 'm': | |
1794 | case 'j': | |
36591ba1 | 1795 | case 'l': |
36591ba1 SL |
1796 | /* We can't have %hi, %lo or %hiadj here. */ |
1797 | if (*argstr == '%') | |
1798 | as_bad (_("badly formed expression near %s"), argstr); | |
1799 | break; | |
531a94fd | 1800 | case 'o': |
fad16e30 | 1801 | case 'E': |
531a94fd | 1802 | break; |
36591ba1 | 1803 | default: |
531a94fd | 1804 | BAD_CASE (*parsestr); |
36591ba1 SL |
1805 | break; |
1806 | } | |
1807 | ||
1808 | return argstr; | |
1809 | } | |
1810 | ||
1811 | /* The function consume_separator takes a pointer into a string | |
1812 | of instruction tokens (args) and a pointer into a string representing | |
1813 | the expected sequence of tokens and separators. It finds the first | |
1814 | instance of the character pointed to by separator in argstr, and | |
1815 | returns a pointer to the next element of argstr, which is the | |
1816 | following token in the sequence. */ | |
1817 | static char * | |
1818 | nios2_consume_separator (char *argstr, const char *separator) | |
1819 | { | |
1820 | char *p; | |
1821 | ||
1822 | /* If we have a opcode reg, expr(reg) type instruction, and | |
1823 | * we are separating the expr from the (reg), we find the last | |
1824 | * (, just in case the expression has parentheses. */ | |
1825 | ||
1826 | if (*separator == '(') | |
1827 | p = strrchr (argstr, *separator); | |
1828 | else | |
1829 | p = strchr (argstr, *separator); | |
1830 | ||
1831 | if (p != NULL) | |
1832 | *p++ = 0; | |
36591ba1 SL |
1833 | return p; |
1834 | } | |
1835 | ||
1836 | ||
1837 | /* The principal argument parsing function which takes a string argstr | |
1838 | representing the instruction arguments for insn, and extracts the argument | |
1839 | tokens matching parsestr into parsed_args. */ | |
1840 | static void | |
1841 | nios2_parse_args (nios2_insn_infoS *insn, char *argstr, | |
1842 | const char *parsestr, char **parsed_args) | |
1843 | { | |
1844 | char *p; | |
1845 | char *end = NULL; | |
1846 | int i; | |
1847 | p = argstr; | |
1848 | i = 0; | |
1849 | bfd_boolean terminate = FALSE; | |
1850 | ||
1851 | /* This rest of this function is it too fragile and it mostly works, | |
1852 | therefore special case this one. */ | |
1853 | if (*parsestr == 0 && argstr != 0) | |
1854 | { | |
1855 | as_bad (_("too many arguments")); | |
1856 | parsed_args[0] = NULL; | |
1857 | return; | |
1858 | } | |
1859 | ||
1860 | while (p != NULL && !terminate && i < NIOS2_MAX_INSN_TOKENS) | |
1861 | { | |
96ba4233 | 1862 | parsed_args[i] = nios2_consume_arg (p, parsestr); |
36591ba1 | 1863 | ++parsestr; |
96ba4233 | 1864 | while (*parsestr == '(' || *parsestr == ')' || *parsestr == ',') |
36591ba1 | 1865 | { |
96ba4233 | 1866 | char *context = p; |
36591ba1 | 1867 | p = nios2_consume_separator (p, parsestr); |
96ba4233 SL |
1868 | /* Check for missing separators. */ |
1869 | if (!p && !(insn->insn_nios2_opcode->pinfo & NIOS2_INSN_OPTARG)) | |
1870 | { | |
1871 | as_bad (_("expecting %c near %s"), *parsestr, context); | |
1872 | break; | |
1873 | } | |
36591ba1 SL |
1874 | ++parsestr; |
1875 | } | |
96ba4233 SL |
1876 | |
1877 | if (*parsestr == '\0') | |
36591ba1 SL |
1878 | { |
1879 | /* Check that the argument string has no trailing arguments. */ | |
96ba4233 | 1880 | end = strpbrk (p, ","); |
36591ba1 SL |
1881 | if (end != NULL) |
1882 | as_bad (_("too many arguments")); | |
1883 | } | |
1884 | ||
1885 | if (*parsestr == '\0' || (p != NULL && *p == '\0')) | |
1886 | terminate = TRUE; | |
1887 | ++i; | |
1888 | } | |
1889 | ||
1890 | parsed_args[i] = NULL; | |
36591ba1 SL |
1891 | } |
1892 | ||
1893 | ||
1894 | \f | |
1895 | /** Support for pseudo-op parsing. These are macro-like opcodes that | |
1896 | expand into real insns by suitable fiddling with the operands. */ | |
1897 | ||
1898 | /* Append the string modifier to the string contained in the argument at | |
1899 | parsed_args[ndx]. */ | |
1900 | static void | |
1901 | nios2_modify_arg (char **parsed_args, const char *modifier, | |
1902 | int unused ATTRIBUTE_UNUSED, int ndx) | |
1903 | { | |
1904 | char *tmp = parsed_args[ndx]; | |
1905 | ||
1906 | parsed_args[ndx] | |
1907 | = (char *) malloc (strlen (parsed_args[ndx]) + strlen (modifier) + 1); | |
1908 | strcpy (parsed_args[ndx], tmp); | |
1909 | strcat (parsed_args[ndx], modifier); | |
1910 | } | |
1911 | ||
1912 | /* Modify parsed_args[ndx] by negating that argument. */ | |
1913 | static void | |
1914 | nios2_negate_arg (char **parsed_args, const char *modifier ATTRIBUTE_UNUSED, | |
1915 | int unused ATTRIBUTE_UNUSED, int ndx) | |
1916 | { | |
1917 | char *tmp = parsed_args[ndx]; | |
1918 | ||
1919 | parsed_args[ndx] | |
1920 | = (char *) malloc (strlen ("~(") + strlen (parsed_args[ndx]) + | |
1921 | strlen (")+1") + 1); | |
1922 | ||
1923 | strcpy (parsed_args[ndx], "~("); | |
1924 | strcat (parsed_args[ndx], tmp); | |
1925 | strcat (parsed_args[ndx], ")+1"); | |
1926 | } | |
1927 | ||
1928 | /* The function nios2_swap_args swaps the pointers at indices index_1 and | |
1929 | index_2 in the array parsed_args[] - this is used for operand swapping | |
1930 | for comparison operations. */ | |
1931 | static void | |
1932 | nios2_swap_args (char **parsed_args, const char *unused ATTRIBUTE_UNUSED, | |
1933 | int index_1, int index_2) | |
1934 | { | |
1935 | char *tmp; | |
1936 | gas_assert (index_1 < NIOS2_MAX_INSN_TOKENS | |
1937 | && index_2 < NIOS2_MAX_INSN_TOKENS); | |
1938 | tmp = parsed_args[index_1]; | |
1939 | parsed_args[index_1] = parsed_args[index_2]; | |
1940 | parsed_args[index_2] = tmp; | |
1941 | } | |
1942 | ||
1943 | /* This function appends the string appnd to the array of strings in | |
1944 | parsed_args num times starting at index start in the array. */ | |
1945 | static void | |
1946 | nios2_append_arg (char **parsed_args, const char *appnd, int num, | |
1947 | int start) | |
1948 | { | |
1949 | int i, count; | |
1950 | char *tmp; | |
1951 | ||
1952 | gas_assert ((start + num) < NIOS2_MAX_INSN_TOKENS); | |
1953 | ||
1954 | if (nios2_mode == NIOS2_MODE_TEST) | |
1955 | tmp = parsed_args[start]; | |
1956 | else | |
1957 | tmp = NULL; | |
1958 | ||
1959 | for (i = start, count = num; count > 0; ++i, --count) | |
1960 | parsed_args[i] = (char *) appnd; | |
1961 | ||
1962 | gas_assert (i == (start + num)); | |
1963 | parsed_args[i] = tmp; | |
1964 | parsed_args[i + 1] = NULL; | |
1965 | } | |
1966 | ||
1967 | /* This function inserts the string insert num times in the array | |
1968 | parsed_args, starting at the index start. */ | |
1969 | static void | |
1970 | nios2_insert_arg (char **parsed_args, const char *insert, int num, | |
1971 | int start) | |
1972 | { | |
1973 | int i, count; | |
1974 | ||
1975 | gas_assert ((start + num) < NIOS2_MAX_INSN_TOKENS); | |
1976 | ||
1977 | /* Move the existing arguments up to create space. */ | |
1978 | for (i = NIOS2_MAX_INSN_TOKENS; i - num >= start; --i) | |
1979 | parsed_args[i] = parsed_args[i - num]; | |
1980 | ||
1981 | for (i = start, count = num; count > 0; ++i, --count) | |
1982 | parsed_args[i] = (char *) insert; | |
1983 | } | |
1984 | ||
1985 | /* Cleanup function to free malloc'ed arg strings. */ | |
1986 | static void | |
1987 | nios2_free_arg (char **parsed_args, int num ATTRIBUTE_UNUSED, int start) | |
1988 | { | |
1989 | if (parsed_args[start]) | |
1990 | { | |
1991 | free (parsed_args[start]); | |
1992 | parsed_args[start] = NULL; | |
1993 | } | |
1994 | } | |
1995 | ||
1996 | /* This function swaps the pseudo-op for a real op. */ | |
1997 | static nios2_ps_insn_infoS* | |
1998 | nios2_translate_pseudo_insn (nios2_insn_infoS *insn) | |
1999 | { | |
2000 | ||
2001 | nios2_ps_insn_infoS *ps_insn; | |
2002 | ||
2003 | /* Find which real insn the pseudo-op transates to and | |
2004 | switch the insn_info ptr to point to it. */ | |
2005 | ps_insn = nios2_ps_lookup (insn->insn_nios2_opcode->name); | |
2006 | ||
2007 | if (ps_insn != NULL) | |
2008 | { | |
2009 | insn->insn_nios2_opcode = nios2_opcode_lookup (ps_insn->insn); | |
2010 | insn->insn_tokens[0] = insn->insn_nios2_opcode->name; | |
2011 | /* Modify the args so they work with the real insn. */ | |
2012 | ps_insn->arg_modifer_func ((char **) insn->insn_tokens, | |
2013 | ps_insn->arg_modifier, ps_insn->num, | |
2014 | ps_insn->index); | |
2015 | } | |
2016 | else | |
2017 | /* we cannot recover from this. */ | |
2018 | as_fatal (_("unrecognized pseudo-instruction %s"), | |
2019 | ps_insn->pseudo_insn); | |
2020 | return ps_insn; | |
2021 | } | |
2022 | ||
2023 | /* Invoke the cleanup handler for pseudo-insn ps_insn on insn. */ | |
2024 | static void | |
2025 | nios2_cleanup_pseudo_insn (nios2_insn_infoS *insn, | |
2026 | nios2_ps_insn_infoS *ps_insn) | |
2027 | { | |
2028 | if (ps_insn->arg_cleanup_func) | |
2029 | (ps_insn->arg_cleanup_func) ((char **) insn->insn_tokens, | |
2030 | ps_insn->num, ps_insn->index); | |
2031 | } | |
2032 | ||
2033 | const nios2_ps_insn_infoS nios2_ps_insn_info_structs[] = { | |
2034 | /* pseudo-op, real-op, arg, arg_modifier_func, num, index, arg_cleanup_func */ | |
2035 | {"mov", "add", nios2_append_arg, "zero", 1, 3, NULL}, | |
2036 | {"movi", "addi", nios2_insert_arg, "zero", 1, 2, NULL}, | |
2037 | {"movhi", "orhi", nios2_insert_arg, "zero", 1, 2, NULL}, | |
2038 | {"movui", "ori", nios2_insert_arg, "zero", 1, 2, NULL}, | |
2039 | {"movia", "orhi", nios2_insert_arg, "zero", 1, 2, NULL}, | |
2040 | {"nop", "add", nios2_append_arg, "zero", 3, 1, NULL}, | |
2041 | {"bgt", "blt", nios2_swap_args, "", 1, 2, NULL}, | |
2042 | {"bgtu", "bltu", nios2_swap_args, "", 1, 2, NULL}, | |
2043 | {"ble", "bge", nios2_swap_args, "", 1, 2, NULL}, | |
2044 | {"bleu", "bgeu", nios2_swap_args, "", 1, 2, NULL}, | |
2045 | {"cmpgt", "cmplt", nios2_swap_args, "", 2, 3, NULL}, | |
2046 | {"cmpgtu", "cmpltu", nios2_swap_args, "", 2, 3, NULL}, | |
2047 | {"cmple", "cmpge", nios2_swap_args, "", 2, 3, NULL}, | |
2048 | {"cmpleu", "cmpgeu", nios2_swap_args, "", 2, 3, NULL}, | |
2049 | {"cmpgti", "cmpgei", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, | |
2050 | {"cmpgtui", "cmpgeui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, | |
2051 | {"cmplei", "cmplti", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, | |
2052 | {"cmpleui", "cmpltui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, | |
2053 | {"subi", "addi", nios2_negate_arg, "", 0, 3, nios2_free_arg} | |
2054 | /* Add further pseudo-ops here. */ | |
2055 | }; | |
2056 | ||
2057 | #define NIOS2_NUM_PSEUDO_INSNS \ | |
2058 | ((sizeof(nios2_ps_insn_info_structs)/ \ | |
2059 | sizeof(nios2_ps_insn_info_structs[0]))) | |
2060 | const int nios2_num_ps_insn_info_structs = NIOS2_NUM_PSEUDO_INSNS; | |
2061 | ||
2062 | \f | |
2063 | /** Assembler output support. */ | |
2064 | ||
36591ba1 SL |
2065 | /* Output a normal instruction. */ |
2066 | static void | |
2067 | output_insn (nios2_insn_infoS *insn) | |
2068 | { | |
2069 | char *f; | |
96ba4233 SL |
2070 | nios2_insn_relocS *reloc; |
2071 | f = frag_more (insn->insn_nios2_opcode->size); | |
36591ba1 SL |
2072 | /* This allocates enough space for the instruction |
2073 | and puts it in the current frag. */ | |
96ba4233 | 2074 | md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size); |
36591ba1 | 2075 | /* Emit debug info. */ |
96ba4233 | 2076 | dwarf2_emit_insn (insn->insn_nios2_opcode->size); |
36591ba1 | 2077 | /* Create any fixups to be acted on later. */ |
96ba4233 | 2078 | |
36591ba1 | 2079 | for (reloc = insn->insn_reloc; reloc != NULL; reloc = reloc->reloc_next) |
96ba4233 SL |
2080 | fix_new_exp (frag_now, f - frag_now->fr_literal, |
2081 | insn->insn_nios2_opcode->size, | |
36591ba1 SL |
2082 | &reloc->reloc_expression, reloc->reloc_pcrel, |
2083 | reloc->reloc_type); | |
2084 | } | |
2085 | ||
2086 | /* Output an unconditional branch. */ | |
2087 | static void | |
2088 | output_ubranch (nios2_insn_infoS *insn) | |
2089 | { | |
2090 | nios2_insn_relocS *reloc = insn->insn_reloc; | |
2091 | ||
2092 | /* If the reloc is NULL, there was an error assembling the branch. */ | |
2093 | if (reloc != NULL) | |
2094 | { | |
2095 | symbolS *symp = reloc->reloc_expression.X_add_symbol; | |
2096 | offsetT offset = reloc->reloc_expression.X_add_number; | |
2097 | char *f; | |
2098 | ||
2099 | /* Tag dwarf2 debug info to the address at the start of the insn. | |
2100 | We must do it before frag_var() below closes off the frag. */ | |
2101 | dwarf2_emit_insn (0); | |
2102 | ||
2103 | /* We create a machine dependent frag which can grow | |
2104 | to accommodate the largest possible instruction sequence | |
2105 | this may generate. */ | |
2106 | f = frag_var (rs_machine_dependent, | |
96ba4233 SL |
2107 | UBRANCH_MAX_SIZE, insn->insn_nios2_opcode->size, |
2108 | UBRANCH_SUBTYPE (0), symp, offset, NULL); | |
36591ba1 | 2109 | |
96ba4233 | 2110 | md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size); |
36591ba1 SL |
2111 | |
2112 | /* We leave fixup generation to md_convert_frag. */ | |
2113 | } | |
2114 | } | |
2115 | ||
2116 | /* Output a conditional branch. */ | |
2117 | static void | |
2118 | output_cbranch (nios2_insn_infoS *insn) | |
2119 | { | |
2120 | nios2_insn_relocS *reloc = insn->insn_reloc; | |
2121 | ||
2122 | /* If the reloc is NULL, there was an error assembling the branch. */ | |
2123 | if (reloc != NULL) | |
2124 | { | |
2125 | symbolS *symp = reloc->reloc_expression.X_add_symbol; | |
2126 | offsetT offset = reloc->reloc_expression.X_add_number; | |
2127 | char *f; | |
2128 | ||
2129 | /* Tag dwarf2 debug info to the address at the start of the insn. | |
2130 | We must do it before frag_var() below closes off the frag. */ | |
2131 | dwarf2_emit_insn (0); | |
2132 | ||
2133 | /* We create a machine dependent frag which can grow | |
2134 | to accommodate the largest possible instruction sequence | |
2135 | this may generate. */ | |
2136 | f = frag_var (rs_machine_dependent, | |
96ba4233 SL |
2137 | CBRANCH_MAX_SIZE, insn->insn_nios2_opcode->size, |
2138 | CBRANCH_SUBTYPE (0), symp, offset, NULL); | |
36591ba1 | 2139 | |
96ba4233 | 2140 | md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size); |
36591ba1 SL |
2141 | |
2142 | /* We leave fixup generation to md_convert_frag. */ | |
2143 | } | |
2144 | } | |
2145 | ||
2146 | /* Output a call sequence. Since calls are not pc-relative for NIOS2, | |
2147 | but are page-relative, we cannot tell at any stage in assembly | |
2148 | whether a call will be out of range since a section may be linked | |
2149 | at any address. So if we are relaxing, we convert all call instructions | |
2150 | to long call sequences, and rely on the linker to relax them back to | |
2151 | short calls. */ | |
2152 | static void | |
2153 | output_call (nios2_insn_infoS *insn) | |
2154 | { | |
2155 | /* This allocates enough space for the instruction | |
2156 | and puts it in the current frag. */ | |
2157 | char *f = frag_more (12); | |
2158 | nios2_insn_relocS *reloc = insn->insn_reloc; | |
2159 | ||
96ba4233 SL |
2160 | md_number_to_chars (f, |
2161 | (MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM) | |
2162 | | SET_IW_I_A (0)), | |
2163 | 4); | |
36591ba1 SL |
2164 | dwarf2_emit_insn (4); |
2165 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, | |
2166 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_HI16); | |
96ba4233 SL |
2167 | md_number_to_chars (f + 4, |
2168 | (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM) | |
2169 | | SET_IW_I_A (AT_REGNUM)), | |
2170 | 4); | |
36591ba1 SL |
2171 | dwarf2_emit_insn (4); |
2172 | fix_new_exp (frag_now, f - frag_now->fr_literal + 4, 4, | |
2173 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_LO16); | |
96ba4233 | 2174 | md_number_to_chars (f + 8, MATCH_R1_CALLR | SET_IW_R_A (AT_REGNUM), 4); |
36591ba1 SL |
2175 | dwarf2_emit_insn (4); |
2176 | } | |
2177 | ||
36591ba1 SL |
2178 | /* Output a movhi/addi pair for the movia pseudo-op. */ |
2179 | static void | |
2180 | output_movia (nios2_insn_infoS *insn) | |
2181 | { | |
2182 | /* This allocates enough space for the instruction | |
2183 | and puts it in the current frag. */ | |
2184 | char *f = frag_more (8); | |
2185 | nios2_insn_relocS *reloc = insn->insn_reloc; | |
96ba4233 | 2186 | unsigned long reg_index = GET_IW_I_B (insn->insn_code); |
36591ba1 SL |
2187 | |
2188 | /* If the reloc is NULL, there was an error assembling the movia. */ | |
2189 | if (reloc != NULL) | |
2190 | { | |
2191 | md_number_to_chars (f, insn->insn_code, 4); | |
2192 | dwarf2_emit_insn (4); | |
36591ba1 SL |
2193 | fix_new (frag_now, f - frag_now->fr_literal, 4, |
2194 | reloc->reloc_expression.X_add_symbol, | |
2195 | reloc->reloc_expression.X_add_number, 0, | |
2196 | BFD_RELOC_NIOS2_HIADJ16); | |
96ba4233 SL |
2197 | md_number_to_chars (f + 4, |
2198 | (MATCH_R1_ADDI | SET_IW_I_A (reg_index) | |
2199 | | SET_IW_I_B (reg_index)), | |
2200 | 4); | |
2201 | dwarf2_emit_insn (4); | |
36591ba1 SL |
2202 | fix_new (frag_now, f + 4 - frag_now->fr_literal, 4, |
2203 | reloc->reloc_expression.X_add_symbol, | |
2204 | reloc->reloc_expression.X_add_number, 0, BFD_RELOC_NIOS2_LO16); | |
2205 | } | |
2206 | } | |
2207 | ||
2208 | ||
2209 | \f | |
2210 | /** External interfaces. */ | |
2211 | ||
2212 | /* The following functions are called by machine-independent parts of | |
2213 | the assembler. */ | |
2214 | int | |
2215 | md_parse_option (int c, char *arg ATTRIBUTE_UNUSED) | |
2216 | { | |
2217 | switch (c) | |
2218 | { | |
2219 | case 'r': | |
2220 | /* Hidden option for self-test mode. */ | |
2221 | nios2_mode = NIOS2_MODE_TEST; | |
2222 | break; | |
2223 | case OPTION_RELAX_ALL: | |
2224 | nios2_as_options.relax = relax_all; | |
2225 | break; | |
2226 | case OPTION_NORELAX: | |
2227 | nios2_as_options.relax = relax_none; | |
2228 | break; | |
2229 | case OPTION_RELAX_SECTION: | |
2230 | nios2_as_options.relax = relax_section; | |
2231 | break; | |
2232 | case OPTION_EB: | |
2233 | target_big_endian = 1; | |
2234 | break; | |
2235 | case OPTION_EL: | |
2236 | target_big_endian = 0; | |
2237 | break; | |
2238 | default: | |
2239 | return 0; | |
2240 | break; | |
2241 | } | |
2242 | ||
2243 | return 1; | |
2244 | } | |
2245 | ||
2246 | /* Implement TARGET_FORMAT. We can choose to be big-endian or | |
2247 | little-endian at runtime based on a switch. */ | |
2248 | const char * | |
2249 | nios2_target_format (void) | |
2250 | { | |
2251 | return target_big_endian ? "elf32-bignios2" : "elf32-littlenios2"; | |
2252 | } | |
2253 | ||
2254 | /* Machine-dependent usage message. */ | |
2255 | void | |
2256 | md_show_usage (FILE *stream) | |
2257 | { | |
2258 | fprintf (stream, " NIOS2 options:\n" | |
2259 | " -relax-all replace all branch and call " | |
2260 | "instructions with jmp and callr sequences\n" | |
2261 | " -relax-section replace identified out of range " | |
2262 | "branches with jmp sequences (default)\n" | |
2263 | " -no-relax do not replace any branches or calls\n" | |
2264 | " -EB force big-endian byte ordering\n" | |
2265 | " -EL force little-endian byte ordering\n"); | |
2266 | } | |
2267 | ||
2268 | /* This function is called once, at assembler startup time. | |
2269 | It should set up all the tables, etc. that the MD part of the | |
2270 | assembler will need. */ | |
2271 | void | |
2272 | md_begin (void) | |
2273 | { | |
2274 | int i; | |
2275 | const char *inserted; | |
2276 | ||
2277 | /* Create and fill a hashtable for the Nios II opcodes, registers and | |
2278 | arguments. */ | |
2279 | nios2_opcode_hash = hash_new (); | |
2280 | nios2_reg_hash = hash_new (); | |
36591ba1 SL |
2281 | nios2_ps_hash = hash_new (); |
2282 | ||
96ba4233 | 2283 | for (i = 0; i < nios2_num_opcodes; ++i) |
36591ba1 SL |
2284 | { |
2285 | inserted | |
2286 | = hash_insert (nios2_opcode_hash, nios2_opcodes[i].name, | |
2287 | (PTR) & nios2_opcodes[i]); | |
2288 | if (inserted != NULL) | |
2289 | { | |
2290 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), | |
2291 | nios2_opcodes[i].name, inserted); | |
2292 | /* Probably a memory allocation problem? Give up now. */ | |
2293 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
2294 | } | |
2295 | } | |
2296 | ||
2297 | for (i = 0; i < nios2_num_regs; ++i) | |
2298 | { | |
2299 | inserted | |
2300 | = hash_insert (nios2_reg_hash, nios2_regs[i].name, | |
2301 | (PTR) & nios2_regs[i]); | |
2302 | if (inserted != NULL) | |
2303 | { | |
2304 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), | |
2305 | nios2_regs[i].name, inserted); | |
2306 | /* Probably a memory allocation problem? Give up now. */ | |
2307 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
2308 | } | |
2309 | ||
2310 | } | |
2311 | ||
36591ba1 SL |
2312 | for (i = 0; i < nios2_num_ps_insn_info_structs; ++i) |
2313 | { | |
2314 | inserted | |
2315 | = hash_insert (nios2_ps_hash, nios2_ps_insn_info_structs[i].pseudo_insn, | |
2316 | (PTR) & nios2_ps_insn_info_structs[i]); | |
2317 | if (inserted != NULL) | |
2318 | { | |
2319 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), | |
2320 | nios2_ps_insn_info_structs[i].pseudo_insn, inserted); | |
2321 | /* Probably a memory allocation problem? Give up now. */ | |
2322 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
2323 | } | |
2324 | } | |
2325 | ||
2326 | /* Assembler option defaults. */ | |
2327 | nios2_as_options.noat = FALSE; | |
2328 | nios2_as_options.nobreak = FALSE; | |
2329 | ||
2330 | /* Debug information is incompatible with relaxation. */ | |
2331 | if (debug_type != DEBUG_UNSPECIFIED) | |
2332 | nios2_as_options.relax = relax_none; | |
2333 | ||
2334 | /* Initialize the alignment data. */ | |
2335 | nios2_current_align_seg = now_seg; | |
2336 | nios2_last_label = NULL; | |
2337 | nios2_current_align = 0; | |
2338 | } | |
2339 | ||
2340 | ||
2341 | /* Assembles a single line of Nios II assembly language. */ | |
2342 | void | |
2343 | md_assemble (char *op_str) | |
2344 | { | |
2345 | char *argstr; | |
2346 | char *op_strdup = NULL; | |
36591ba1 SL |
2347 | unsigned long saved_pinfo = 0; |
2348 | nios2_insn_infoS thisinsn; | |
2349 | nios2_insn_infoS *insn = &thisinsn; | |
2350 | ||
2351 | /* Make sure we are aligned on a 4-byte boundary. */ | |
2352 | if (nios2_current_align < 2) | |
2353 | nios2_align (2, NULL, nios2_last_label); | |
2354 | else if (nios2_current_align > 2) | |
2355 | nios2_current_align = 2; | |
2356 | nios2_last_label = NULL; | |
2357 | ||
2358 | /* We don't want to clobber to op_str | |
2359 | because we want to be able to use it in messages. */ | |
2360 | op_strdup = strdup (op_str); | |
2361 | insn->insn_tokens[0] = strtok (op_strdup, " "); | |
2362 | argstr = strtok (NULL, ""); | |
2363 | ||
2364 | /* Assemble the opcode. */ | |
2365 | insn->insn_nios2_opcode = nios2_opcode_lookup (insn->insn_tokens[0]); | |
2366 | insn->insn_reloc = NULL; | |
2367 | ||
2368 | if (insn->insn_nios2_opcode != NULL) | |
2369 | { | |
2370 | nios2_ps_insn_infoS *ps_insn = NULL; | |
2371 | /* Set the opcode for the instruction. */ | |
2372 | insn->insn_code = insn->insn_nios2_opcode->match; | |
96ba4233 | 2373 | insn->constant_bits = 0; |
36591ba1 SL |
2374 | |
2375 | /* Parse the arguments pointed to by argstr. */ | |
2376 | if (nios2_mode == NIOS2_MODE_ASSEMBLE) | |
2377 | nios2_parse_args (insn, argstr, insn->insn_nios2_opcode->args, | |
2378 | (char **) &insn->insn_tokens[1]); | |
2379 | else | |
2380 | nios2_parse_args (insn, argstr, insn->insn_nios2_opcode->args_test, | |
2381 | (char **) &insn->insn_tokens[1]); | |
2382 | ||
2383 | /* We need to preserve the MOVIA macro as this is clobbered by | |
2384 | translate_pseudo_insn. */ | |
2385 | if (insn->insn_nios2_opcode->pinfo == NIOS2_INSN_MACRO_MOVIA) | |
2386 | saved_pinfo = NIOS2_INSN_MACRO_MOVIA; | |
2387 | /* If the instruction is an pseudo-instruction, we want to replace it | |
2388 | with its real equivalent, and then continue. */ | |
2389 | if ((insn->insn_nios2_opcode->pinfo & NIOS2_INSN_MACRO) | |
2390 | == NIOS2_INSN_MACRO) | |
2391 | ps_insn = nios2_translate_pseudo_insn (insn); | |
2392 | ||
96ba4233 SL |
2393 | /* Assemble the parsed arguments into the instruction word. */ |
2394 | nios2_assemble_args (insn); | |
2395 | ||
2396 | /* Handle relaxation and other transformations. */ | |
2397 | if (nios2_as_options.relax != relax_none | |
2398 | && !nios2_as_options.noat | |
2399 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_UBRANCH) | |
2400 | output_ubranch (insn); | |
2401 | else if (nios2_as_options.relax != relax_none | |
2402 | && !nios2_as_options.noat | |
2403 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_CBRANCH) | |
2404 | output_cbranch (insn); | |
2405 | else if (nios2_as_options.relax == relax_all | |
2406 | && !nios2_as_options.noat | |
2407 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_CALL | |
2408 | && insn->insn_reloc | |
2409 | && ((insn->insn_reloc->reloc_type | |
2410 | == BFD_RELOC_NIOS2_CALL26) | |
2411 | || (insn->insn_reloc->reloc_type | |
2412 | == BFD_RELOC_NIOS2_CALL26_NOAT))) | |
2413 | output_call (insn); | |
96ba4233 SL |
2414 | else if (saved_pinfo == NIOS2_INSN_MACRO_MOVIA) |
2415 | output_movia (insn); | |
36591ba1 | 2416 | else |
96ba4233 SL |
2417 | output_insn (insn); |
2418 | if (ps_insn) | |
2419 | nios2_cleanup_pseudo_insn (insn, ps_insn); | |
36591ba1 SL |
2420 | } |
2421 | else | |
2422 | /* Unrecognised instruction - error. */ | |
2423 | as_bad (_("unrecognised instruction %s"), insn->insn_tokens[0]); | |
2424 | ||
2425 | /* Don't leak memory. */ | |
2426 | free (op_strdup); | |
2427 | } | |
2428 | ||
2429 | /* Round up section size. */ | |
2430 | valueT | |
2431 | md_section_align (asection *seg ATTRIBUTE_UNUSED, valueT size) | |
2432 | { | |
2433 | /* I think byte alignment is fine here. */ | |
2434 | return size; | |
2435 | } | |
2436 | ||
2437 | /* Implement TC_FORCE_RELOCATION. */ | |
2438 | int | |
2439 | nios2_force_relocation (fixS *fixp) | |
2440 | { | |
2441 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT | |
2442 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY | |
2443 | || fixp->fx_r_type == BFD_RELOC_NIOS2_ALIGN) | |
2444 | return 1; | |
2445 | ||
2446 | return generic_force_reloc (fixp); | |
2447 | } | |
2448 | ||
2449 | /* Implement tc_fix_adjustable. */ | |
2450 | int | |
2451 | nios2_fix_adjustable (fixS *fixp) | |
2452 | { | |
2453 | if (fixp->fx_addsy == NULL) | |
2454 | return 1; | |
2455 | ||
2456 | #ifdef OBJ_ELF | |
2457 | /* Prevent all adjustments to global symbols. */ | |
2458 | if (OUTPUT_FLAVOR == bfd_target_elf_flavour | |
2459 | && (S_IS_EXTERNAL (fixp->fx_addsy) || S_IS_WEAK (fixp->fx_addsy))) | |
2460 | return 0; | |
2461 | #endif | |
2462 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT | |
2463 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) | |
2464 | return 0; | |
2465 | ||
2466 | /* Preserve relocations against symbols with function type. */ | |
2467 | if (symbol_get_bfdsym (fixp->fx_addsy)->flags & BSF_FUNCTION) | |
2468 | return 0; | |
2469 | ||
2470 | /* Don't allow symbols to be discarded on GOT related relocs. */ | |
2471 | if (fixp->fx_r_type == BFD_RELOC_NIOS2_GOT16 | |
2472 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL16 | |
2473 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_LO | |
2474 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_HA | |
2475 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_GD16 | |
2476 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LDM16 | |
2477 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LDO16 | |
2478 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_IE16 | |
2479 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LE16 | |
2480 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPMOD | |
2481 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPREL | |
2482 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_TPREL | |
1c2de463 SL |
2483 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF |
2484 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOT_LO | |
2485 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOT_HA | |
2486 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL_LO | |
2487 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL_HA | |
2488 | ) | |
36591ba1 SL |
2489 | return 0; |
2490 | ||
2491 | return 1; | |
2492 | } | |
2493 | ||
2494 | /* Implement tc_frob_symbol. This is called in adjust_reloc_syms; | |
2495 | it is used to remove *ABS* references from the symbol table. */ | |
2496 | int | |
2497 | nios2_frob_symbol (symbolS *symp) | |
2498 | { | |
2499 | if ((OUTPUT_FLAVOR == bfd_target_elf_flavour | |
2500 | && symp == section_symbol (absolute_section)) | |
2501 | || !S_IS_DEFINED (symp)) | |
2502 | return 1; | |
2503 | else | |
2504 | return 0; | |
2505 | } | |
2506 | ||
2507 | /* The function tc_gen_reloc creates a relocation structure for the | |
2508 | fixup fixp, and returns a pointer to it. This structure is passed | |
2509 | to bfd_install_relocation so that it can be written to the object | |
2510 | file for linking. */ | |
2511 | arelent * | |
2512 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) | |
2513 | { | |
2514 | arelent *reloc = (arelent *) xmalloc (sizeof (arelent)); | |
2515 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); | |
2516 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); | |
2517 | ||
2518 | reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; | |
2519 | reloc->addend = fixp->fx_offset; /* fixp->fx_addnumber; */ | |
2520 | ||
2521 | if (fixp->fx_pcrel) | |
2522 | { | |
2523 | switch (fixp->fx_r_type) | |
2524 | { | |
2525 | case BFD_RELOC_16: | |
2526 | fixp->fx_r_type = BFD_RELOC_16_PCREL; | |
2527 | break; | |
2528 | case BFD_RELOC_NIOS2_LO16: | |
2529 | fixp->fx_r_type = BFD_RELOC_NIOS2_PCREL_LO; | |
2530 | break; | |
2531 | case BFD_RELOC_NIOS2_HIADJ16: | |
2532 | fixp->fx_r_type = BFD_RELOC_NIOS2_PCREL_HA; | |
2533 | break; | |
2534 | default: | |
2535 | break; | |
2536 | } | |
2537 | } | |
2538 | ||
2539 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); | |
2540 | if (reloc->howto == NULL) | |
2541 | { | |
2542 | as_bad_where (fixp->fx_file, fixp->fx_line, | |
2543 | _("can't represent relocation type %s"), | |
2544 | bfd_get_reloc_code_name (fixp->fx_r_type)); | |
2545 | ||
2546 | /* Set howto to a garbage value so that we can keep going. */ | |
2547 | reloc->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_32); | |
2548 | gas_assert (reloc->howto != NULL); | |
2549 | } | |
2550 | return reloc; | |
2551 | } | |
2552 | ||
2553 | long | |
2554 | md_pcrel_from (fixS *fixP ATTRIBUTE_UNUSED) | |
2555 | { | |
2556 | return 0; | |
2557 | } | |
2558 | ||
2559 | /* Called just before the assembler exits. */ | |
2560 | void | |
2561 | md_end () | |
2562 | { | |
2563 | /* FIXME - not yet implemented */ | |
2564 | } | |
2565 | ||
2566 | /* Under ELF we need to default _GLOBAL_OFFSET_TABLE. | |
2567 | Otherwise we have no need to default values of symbols. */ | |
2568 | symbolS * | |
2569 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) | |
2570 | { | |
2571 | #ifdef OBJ_ELF | |
2572 | if (name[0] == '_' && name[1] == 'G' | |
2573 | && strcmp (name, GLOBAL_OFFSET_TABLE_NAME) == 0) | |
2574 | { | |
2575 | if (!GOT_symbol) | |
2576 | { | |
2577 | if (symbol_find (name)) | |
2578 | as_bad ("GOT already in the symbol table"); | |
2579 | ||
2580 | GOT_symbol = symbol_new (name, undefined_section, | |
2581 | (valueT) 0, &zero_address_frag); | |
2582 | } | |
2583 | ||
2584 | return GOT_symbol; | |
2585 | } | |
2586 | #endif | |
2587 | ||
2588 | return 0; | |
2589 | } | |
2590 | ||
2591 | /* Implement tc_frob_label. */ | |
2592 | void | |
2593 | nios2_frob_label (symbolS *lab) | |
2594 | { | |
2595 | /* Emit dwarf information. */ | |
2596 | dwarf2_emit_label (lab); | |
2597 | ||
2598 | /* Update the label's address with the current output pointer. */ | |
2599 | symbol_set_frag (lab, frag_now); | |
2600 | S_SET_VALUE (lab, (valueT) frag_now_fix ()); | |
2601 | ||
2602 | /* Record this label for future adjustment after we find out what | |
2603 | kind of data it references, and the required alignment therewith. */ | |
2604 | nios2_last_label = lab; | |
2605 | } | |
2606 | ||
2607 | /* Implement md_cons_align. */ | |
2608 | void | |
2609 | nios2_cons_align (int size) | |
2610 | { | |
2611 | int log_size = 0; | |
2612 | const char *pfill = NULL; | |
2613 | ||
2614 | while ((size >>= 1) != 0) | |
2615 | ++log_size; | |
2616 | ||
2617 | if (subseg_text_p (now_seg)) | |
2618 | pfill = (const char *) &nop; | |
2619 | else | |
2620 | pfill = NULL; | |
2621 | ||
2622 | if (nios2_auto_align_on) | |
2623 | nios2_align (log_size, pfill, NULL); | |
2624 | ||
2625 | nios2_last_label = NULL; | |
2626 | } | |
2627 | ||
2628 | /* Map 's' to SHF_NIOS2_GPREL. */ | |
2629 | /* This is from the Alpha code tc-alpha.c. */ | |
2630 | int | |
2631 | nios2_elf_section_letter (int letter, char **ptr_msg) | |
2632 | { | |
2633 | if (letter == 's') | |
2634 | return SHF_NIOS2_GPREL; | |
2635 | ||
2636 | *ptr_msg = _("Bad .section directive: want a,s,w,x,M,S,G,T in string"); | |
2637 | return -1; | |
2638 | } | |
2639 | ||
2640 | /* Map SHF_ALPHA_GPREL to SEC_SMALL_DATA. */ | |
2641 | /* This is from the Alpha code tc-alpha.c. */ | |
2642 | flagword | |
2643 | nios2_elf_section_flags (flagword flags, int attr, int type ATTRIBUTE_UNUSED) | |
2644 | { | |
2645 | if (attr & SHF_NIOS2_GPREL) | |
2646 | flags |= SEC_SMALL_DATA; | |
2647 | return flags; | |
2648 | } | |
2649 | ||
2650 | /* Implement TC_PARSE_CONS_EXPRESSION to handle %tls_ldo(...) */ | |
62ebcb5c | 2651 | bfd_reloc_code_real_type |
36591ba1 SL |
2652 | nios2_cons (expressionS *exp, int size) |
2653 | { | |
62ebcb5c | 2654 | bfd_reloc_code_real_type nios2_tls_ldo_reloc = BFD_RELOC_NONE; |
36591ba1 SL |
2655 | |
2656 | SKIP_WHITESPACE (); | |
2657 | if (input_line_pointer[0] == '%') | |
2658 | { | |
2659 | if (strprefix (input_line_pointer + 1, "tls_ldo")) | |
2660 | { | |
2661 | if (size != 4) | |
2662 | as_bad (_("Illegal operands: %%tls_ldo in %d-byte data field"), | |
2663 | size); | |
2664 | else | |
2665 | { | |
2666 | input_line_pointer += 8; | |
62ebcb5c | 2667 | nios2_tls_ldo_reloc = BFD_RELOC_NIOS2_TLS_DTPREL; |
36591ba1 SL |
2668 | } |
2669 | } | |
62ebcb5c | 2670 | if (nios2_tls_ldo_reloc != BFD_RELOC_NONE) |
36591ba1 SL |
2671 | { |
2672 | SKIP_WHITESPACE (); | |
2673 | if (input_line_pointer[0] != '(') | |
2674 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); | |
2675 | else | |
2676 | { | |
2677 | int c; | |
2678 | char *end = ++input_line_pointer; | |
2679 | int npar = 0; | |
2680 | ||
2681 | for (c = *end; !is_end_of_line[c]; end++, c = *end) | |
2682 | if (c == '(') | |
2683 | npar++; | |
2684 | else if (c == ')') | |
2685 | { | |
2686 | if (!npar) | |
2687 | break; | |
2688 | npar--; | |
2689 | } | |
2690 | ||
2691 | if (c != ')') | |
2692 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); | |
2693 | else | |
2694 | { | |
2695 | *end = '\0'; | |
2696 | expression (exp); | |
2697 | *end = c; | |
2698 | if (input_line_pointer != end) | |
2699 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); | |
2700 | else | |
2701 | { | |
2702 | input_line_pointer++; | |
2703 | SKIP_WHITESPACE (); | |
2704 | c = *input_line_pointer; | |
2705 | if (! is_end_of_line[c] && c != ',') | |
2706 | as_bad (_("Illegal operands: garbage after %%tls_ldo()")); | |
2707 | } | |
2708 | } | |
2709 | } | |
2710 | } | |
2711 | } | |
62ebcb5c | 2712 | if (nios2_tls_ldo_reloc == BFD_RELOC_NONE) |
36591ba1 | 2713 | expression (exp); |
62ebcb5c | 2714 | return nios2_tls_ldo_reloc; |
36591ba1 SL |
2715 | } |
2716 | ||
2717 | /* Implement HANDLE_ALIGN. */ | |
2718 | void | |
2719 | nios2_handle_align (fragS *fragp) | |
2720 | { | |
2721 | /* If we are expecting to relax in the linker, then we must output a | |
2722 | relocation to tell the linker we are aligning code. */ | |
2723 | if (nios2_as_options.relax == relax_all | |
2724 | && (fragp->fr_type == rs_align || fragp->fr_type == rs_align_code) | |
2725 | && fragp->fr_address + fragp->fr_fix > 0 | |
2726 | && fragp->fr_offset > 1 | |
2727 | && now_seg != bss_section) | |
2728 | fix_new (fragp, fragp->fr_fix, 0, &abs_symbol, fragp->fr_offset, 0, | |
2729 | BFD_RELOC_NIOS2_ALIGN); | |
2730 | } | |
2731 | ||
2732 | /* Implement tc_regname_to_dw2regnum, to convert REGNAME to a DWARF-2 | |
2733 | register number. */ | |
2734 | int | |
2735 | nios2_regname_to_dw2regnum (char *regname) | |
2736 | { | |
2737 | struct nios2_reg *r = nios2_reg_lookup (regname); | |
2738 | if (r == NULL) | |
2739 | return -1; | |
2740 | return r->index; | |
2741 | } | |
2742 | ||
2743 | /* Implement tc_cfi_frame_initial_instructions, to initialize the DWARF-2 | |
2744 | unwind information for this procedure. */ | |
2745 | void | |
2746 | nios2_frame_initial_instructions (void) | |
2747 | { | |
2748 | cfi_add_CFA_def_cfa (27, 0); | |
2749 | } |