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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" | |
965b1d80 | 28 | #include "libbfd.h" |
36591ba1 SL |
29 | #include "dwarf2dbg.h" |
30 | #include "subsegs.h" | |
31 | #include "safe-ctype.h" | |
32 | #include "dw2gencfi.h" | |
33 | ||
34 | #ifndef OBJ_ELF | |
35 | /* We are not supporting any other target so we throw a compile time error. */ | |
36 | OBJ_ELF not defined | |
37 | #endif | |
38 | ||
39 | /* We can choose our endianness at run-time, regardless of configuration. */ | |
40 | extern int target_big_endian; | |
41 | ||
42 | /* This array holds the chars that always start a comment. If the | |
43 | pre-processor is disabled, these aren't very useful. */ | |
44 | const char comment_chars[] = "#"; | |
45 | ||
46 | /* This array holds the chars that only start a comment at the beginning of | |
47 | a line. If the line seems to have the form '# 123 filename' | |
48 | .line and .file directives will appear in the pre-processed output. */ | |
49 | /* Note that input_file.c hand checks for '#' at the beginning of the | |
50 | first line of the input file. This is because the compiler outputs | |
51 | #NO_APP at the beginning of its output. */ | |
52 | /* Also note that C style comments are always supported. */ | |
53 | const char line_comment_chars[] = "#"; | |
54 | ||
55 | /* This array holds machine specific line separator characters. */ | |
56 | const char line_separator_chars[] = ";"; | |
57 | ||
58 | /* Chars that can be used to separate mant from exp in floating point nums. */ | |
59 | const char EXP_CHARS[] = "eE"; | |
60 | ||
61 | /* Chars that mean this number is a floating point constant. */ | |
62 | /* As in 0f12.456 */ | |
63 | /* or 0d1.2345e12 */ | |
64 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; | |
65 | ||
66 | /* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be | |
67 | changed in read.c. Ideally it shouldn't have to know about it at all, | |
68 | but nothing is ideal around here. */ | |
69 | ||
70 | /* Machine-dependent command-line options. */ | |
71 | ||
72 | const char *md_shortopts = "r"; | |
73 | ||
74 | struct option md_longopts[] = { | |
75 | #define OPTION_RELAX_ALL (OPTION_MD_BASE + 0) | |
76 | {"relax-all", no_argument, NULL, OPTION_RELAX_ALL}, | |
77 | #define OPTION_NORELAX (OPTION_MD_BASE + 1) | |
78 | {"no-relax", no_argument, NULL, OPTION_NORELAX}, | |
79 | #define OPTION_RELAX_SECTION (OPTION_MD_BASE + 2) | |
80 | {"relax-section", no_argument, NULL, OPTION_RELAX_SECTION}, | |
81 | #define OPTION_EB (OPTION_MD_BASE + 3) | |
82 | {"EB", no_argument, NULL, OPTION_EB}, | |
83 | #define OPTION_EL (OPTION_MD_BASE + 4) | |
965b1d80 SL |
84 | {"EL", no_argument, NULL, OPTION_EL}, |
85 | #define OPTION_MARCH (OPTION_MD_BASE + 5) | |
86 | {"march", required_argument, NULL, OPTION_MARCH} | |
36591ba1 SL |
87 | }; |
88 | ||
89 | size_t md_longopts_size = sizeof (md_longopts); | |
90 | ||
91 | /* The assembler supports three different relaxation modes, controlled by | |
92 | command-line options. */ | |
93 | typedef enum | |
94 | { | |
95 | relax_section = 0, | |
96 | relax_none, | |
97 | relax_all | |
98 | } relax_optionT; | |
99 | ||
100 | /* Struct contains all assembler options set with .set. */ | |
101 | struct | |
102 | { | |
103 | /* .set noat -> noat = 1 allows assembly code to use at without warning | |
104 | and macro expansions generate a warning. | |
105 | .set at -> noat = 0, assembly code using at warn but macro expansions | |
106 | do not generate warnings. */ | |
107 | bfd_boolean noat; | |
108 | ||
3739860c | 109 | /* .set nobreak -> nobreak = 1 allows assembly code to use ba,bt without |
36591ba1 SL |
110 | warning. |
111 | .set break -> nobreak = 0, assembly code using ba,bt warns. */ | |
112 | bfd_boolean nobreak; | |
113 | ||
114 | /* .cmd line option -relax-all allows all branches and calls to be replaced | |
115 | with longer versions. | |
116 | -no-relax inhibits branch/call conversion. | |
117 | The default value is relax_section, which relaxes branches within | |
118 | a section. */ | |
119 | relax_optionT relax; | |
120 | ||
121 | } nios2_as_options = {FALSE, FALSE, relax_section}; | |
122 | ||
123 | ||
124 | typedef struct nios2_insn_reloc | |
125 | { | |
126 | /* Any expression in the instruction is parsed into this field, | |
127 | which is passed to fix_new_exp() to generate a fixup. */ | |
128 | expressionS reloc_expression; | |
129 | ||
130 | /* The type of the relocation to be applied. */ | |
131 | bfd_reloc_code_real_type reloc_type; | |
132 | ||
133 | /* PC-relative. */ | |
134 | unsigned int reloc_pcrel; | |
135 | ||
136 | /* The next relocation to be applied to the instruction. */ | |
137 | struct nios2_insn_reloc *reloc_next; | |
138 | } nios2_insn_relocS; | |
139 | ||
140 | /* This struct is used to hold state when assembling instructions. */ | |
141 | typedef struct nios2_insn_info | |
142 | { | |
143 | /* Assembled instruction. */ | |
144 | unsigned long insn_code; | |
96ba4233 SL |
145 | |
146 | /* Constant bits masked into insn_code for self-check mode. */ | |
147 | unsigned long constant_bits; | |
3739860c | 148 | |
36591ba1 SL |
149 | /* Pointer to the relevant bit of the opcode table. */ |
150 | const struct nios2_opcode *insn_nios2_opcode; | |
151 | /* After parsing ptrs to the tokens in the instruction fill this array | |
152 | it is terminated with a null pointer (hence the first +1). | |
153 | The second +1 is because in some parts of the code the opcode | |
154 | is not counted as a token, but still placed in this array. */ | |
155 | const char *insn_tokens[NIOS2_MAX_INSN_TOKENS + 1 + 1]; | |
156 | ||
157 | /* This holds information used to generate fixups | |
158 | and eventually relocations if it is not null. */ | |
159 | nios2_insn_relocS *insn_reloc; | |
160 | } nios2_insn_infoS; | |
161 | ||
36591ba1 SL |
162 | |
163 | /* This struct is used to convert Nios II pseudo-ops into the | |
164 | corresponding real op. */ | |
165 | typedef struct nios2_ps_insn_info | |
166 | { | |
167 | /* Map this pseudo_op... */ | |
168 | const char *pseudo_insn; | |
169 | ||
170 | /* ...to this real instruction. */ | |
171 | const char *insn; | |
172 | ||
173 | /* Call this function to modify the operands.... */ | |
174 | void (*arg_modifer_func) (char ** parsed_args, const char *arg, int num, | |
175 | int start); | |
176 | ||
177 | /* ...with these arguments. */ | |
178 | const char *arg_modifier; | |
179 | int num; | |
180 | int index; | |
181 | ||
182 | /* If arg_modifier_func allocates new memory, provide this function | |
183 | to free it afterwards. */ | |
184 | void (*arg_cleanup_func) (char **parsed_args, int num, int start); | |
185 | } nios2_ps_insn_infoS; | |
186 | ||
187 | /* Opcode hash table. */ | |
188 | static struct hash_control *nios2_opcode_hash = NULL; | |
189 | #define nios2_opcode_lookup(NAME) \ | |
190 | ((struct nios2_opcode *) hash_find (nios2_opcode_hash, (NAME))) | |
191 | ||
192 | /* Register hash table. */ | |
193 | static struct hash_control *nios2_reg_hash = NULL; | |
194 | #define nios2_reg_lookup(NAME) \ | |
195 | ((struct nios2_reg *) hash_find (nios2_reg_hash, (NAME))) | |
196 | ||
36591ba1 SL |
197 | |
198 | /* Pseudo-op hash table. */ | |
199 | static struct hash_control *nios2_ps_hash = NULL; | |
200 | #define nios2_ps_lookup(NAME) \ | |
201 | ((nios2_ps_insn_infoS *) hash_find (nios2_ps_hash, (NAME))) | |
202 | ||
203 | /* The known current alignment of the current section. */ | |
204 | static int nios2_current_align; | |
205 | static segT nios2_current_align_seg; | |
206 | ||
207 | static int nios2_auto_align_on = 1; | |
208 | ||
209 | /* The last seen label in the current section. This is used to auto-align | |
210 | labels preceeding instructions. */ | |
211 | static symbolS *nios2_last_label; | |
212 | ||
c8c8175b SL |
213 | /* If we saw a 16-bit CDX instruction, we can align on 2-byte boundaries |
214 | instead of 4-bytes. Use this to keep track of the minimum power-of-2 | |
215 | alignment. */ | |
216 | static int nios2_min_align = 2; | |
217 | ||
36591ba1 SL |
218 | #ifdef OBJ_ELF |
219 | /* Pre-defined "_GLOBAL_OFFSET_TABLE_" */ | |
220 | symbolS *GOT_symbol; | |
221 | #endif | |
222 | ||
965b1d80 SL |
223 | /* The processor architecture value, EF_NIOS2_ARCH_R1 by default. */ |
224 | static int nios2_architecture = EF_NIOS2_ARCH_R1; | |
225 | ||
36591ba1 SL |
226 | \f |
227 | /** Utility routines. */ | |
228 | /* Function md_chars_to_number takes the sequence of | |
229 | bytes in buf and returns the corresponding value | |
230 | in an int. n must be 1, 2 or 4. */ | |
231 | static valueT | |
232 | md_chars_to_number (char *buf, int n) | |
233 | { | |
234 | int i; | |
235 | valueT val; | |
236 | ||
237 | gas_assert (n == 1 || n == 2 || n == 4); | |
238 | ||
239 | val = 0; | |
240 | if (target_big_endian) | |
241 | for (i = 0; i < n; ++i) | |
242 | val = val | ((buf[i] & 0xff) << 8 * (n - (i + 1))); | |
243 | else | |
244 | for (i = 0; i < n; ++i) | |
245 | val = val | ((buf[i] & 0xff) << 8 * i); | |
246 | return val; | |
247 | } | |
248 | ||
249 | ||
250 | /* This function turns a C long int, short int or char | |
251 | into the series of bytes that represent the number | |
252 | on the target machine. */ | |
253 | void | |
254 | md_number_to_chars (char *buf, valueT val, int n) | |
255 | { | |
256 | gas_assert (n == 1 || n == 2 || n == 4 || n == 8); | |
257 | if (target_big_endian) | |
258 | number_to_chars_bigendian (buf, val, n); | |
259 | else | |
260 | number_to_chars_littleendian (buf, val, n); | |
261 | } | |
262 | ||
263 | /* Turn a string in input_line_pointer into a floating point constant | |
264 | of type TYPE, and store the appropriate bytes in *LITP. The number | |
265 | of LITTLENUMS emitted is stored in *SIZEP. An error message is | |
266 | returned, or NULL on OK. */ | |
267 | char * | |
268 | md_atof (int type, char *litP, int *sizeP) | |
269 | { | |
270 | int prec; | |
271 | LITTLENUM_TYPE words[4]; | |
272 | char *t; | |
273 | int i; | |
274 | ||
275 | switch (type) | |
276 | { | |
277 | case 'f': | |
278 | prec = 2; | |
279 | break; | |
280 | case 'd': | |
281 | prec = 4; | |
282 | break; | |
283 | default: | |
284 | *sizeP = 0; | |
285 | return _("bad call to md_atof"); | |
286 | } | |
287 | ||
288 | t = atof_ieee (input_line_pointer, type, words); | |
289 | if (t) | |
290 | input_line_pointer = t; | |
291 | ||
292 | *sizeP = prec * 2; | |
293 | ||
294 | if (! target_big_endian) | |
295 | for (i = prec - 1; i >= 0; i--, litP += 2) | |
296 | md_number_to_chars (litP, (valueT) words[i], 2); | |
297 | else | |
298 | for (i = 0; i < prec; i++, litP += 2) | |
299 | md_number_to_chars (litP, (valueT) words[i], 2); | |
300 | ||
301 | return NULL; | |
302 | } | |
303 | ||
304 | /* Return true if STR starts with PREFIX, which should be a string literal. */ | |
305 | #define strprefix(STR, PREFIX) \ | |
306 | (strncmp ((STR), PREFIX, strlen (PREFIX)) == 0) | |
307 | ||
36591ba1 SL |
308 | |
309 | /* Return true if STR is prefixed with a special relocation operator. */ | |
310 | static int | |
311 | nios2_special_relocation_p (const char *str) | |
312 | { | |
313 | return (strprefix (str, "%lo") | |
314 | || strprefix (str, "%hi") | |
315 | || strprefix (str, "%hiadj") | |
316 | || strprefix (str, "%gprel") | |
317 | || strprefix (str, "%got") | |
318 | || strprefix (str, "%call") | |
319 | || strprefix (str, "%gotoff_lo") | |
320 | || strprefix (str, "%gotoff_hiadj") | |
321 | || strprefix (str, "%tls_gd") | |
322 | || strprefix (str, "%tls_ldm") | |
323 | || strprefix (str, "%tls_ldo") | |
324 | || strprefix (str, "%tls_ie") | |
325 | || strprefix (str, "%tls_le") | |
326 | || strprefix (str, "%gotoff")); | |
327 | } | |
328 | ||
36591ba1 | 329 | |
c8c8175b SL |
330 | /* nop fill patterns for text section. */ |
331 | static char const nop_r1[4] = { 0x3a, 0x88, 0x01, 0x00 }; | |
332 | static char const nop_r2[4] = { 0x20, 0x00, 0x00, 0xc4 }; | |
333 | static char const nop_r2_cdx[2] = { 0x3b, 0x00 }; | |
334 | static char const *nop32 = nop_r1; | |
335 | static char const *nop16 = NULL; | |
36591ba1 SL |
336 | |
337 | /* Handles all machine-dependent alignment needs. */ | |
338 | static void | |
339 | nios2_align (int log_size, const char *pfill, symbolS *label) | |
340 | { | |
341 | int align; | |
342 | long max_alignment = 15; | |
343 | ||
344 | /* The front end is prone to changing segments out from under us | |
345 | temporarily when -g is in effect. */ | |
346 | int switched_seg_p = (nios2_current_align_seg != now_seg); | |
347 | ||
348 | align = log_size; | |
349 | if (align > max_alignment) | |
350 | { | |
351 | align = max_alignment; | |
352 | as_bad (_("Alignment too large: %d. assumed"), align); | |
353 | } | |
354 | else if (align < 0) | |
355 | { | |
356 | as_warn (_("Alignment negative: 0 assumed")); | |
357 | align = 0; | |
358 | } | |
359 | ||
360 | if (align != 0) | |
361 | { | |
c8c8175b | 362 | if (subseg_text_p (now_seg) && align >= nios2_min_align) |
36591ba1 | 363 | { |
c8c8175b | 364 | /* First, make sure we're on the minimum boundary, in case |
36591ba1 | 365 | someone has been putting .byte values the text section. */ |
c8c8175b SL |
366 | if (nios2_current_align < nios2_min_align || switched_seg_p) |
367 | frag_align (nios2_min_align, 0, 0); | |
368 | ||
369 | /* If we might be on a 2-byte boundary, first align to a | |
370 | 4-byte boundary using the 2-byte nop as fill. */ | |
371 | if (nios2_min_align == 1 | |
372 | && align > nios2_min_align | |
373 | && pfill == nop32 ) | |
374 | { | |
375 | gas_assert (nop16); | |
376 | frag_align_pattern (2, nop16, 2, 0); | |
377 | } | |
36591ba1 SL |
378 | |
379 | /* Now fill in the alignment pattern. */ | |
380 | if (pfill != NULL) | |
c8c8175b | 381 | frag_align_pattern (align, pfill, 4, 0); |
36591ba1 SL |
382 | else |
383 | frag_align (align, 0, 0); | |
384 | } | |
385 | else | |
386 | frag_align (align, 0, 0); | |
387 | ||
388 | if (!switched_seg_p) | |
389 | nios2_current_align = align; | |
390 | ||
391 | /* If the last label was in a different section we can't align it. */ | |
392 | if (label != NULL && !switched_seg_p) | |
393 | { | |
394 | symbolS *sym; | |
395 | int label_seen = FALSE; | |
396 | struct frag *old_frag; | |
397 | valueT old_value; | |
398 | valueT new_value; | |
399 | ||
400 | gas_assert (S_GET_SEGMENT (label) == now_seg); | |
401 | ||
402 | old_frag = symbol_get_frag (label); | |
403 | old_value = S_GET_VALUE (label); | |
404 | new_value = (valueT) frag_now_fix (); | |
405 | ||
406 | /* It is possible to have more than one label at a particular | |
407 | address, especially if debugging is enabled, so we must | |
408 | take care to adjust all the labels at this address in this | |
409 | fragment. To save time we search from the end of the symbol | |
410 | list, backwards, since the symbols we are interested in are | |
411 | almost certainly the ones that were most recently added. | |
412 | Also to save time we stop searching once we have seen at least | |
413 | one matching label, and we encounter a label that is no longer | |
414 | in the target fragment. Note, this search is guaranteed to | |
415 | find at least one match when sym == label, so no special case | |
416 | code is necessary. */ | |
417 | for (sym = symbol_lastP; sym != NULL; sym = symbol_previous (sym)) | |
418 | if (symbol_get_frag (sym) == old_frag | |
419 | && S_GET_VALUE (sym) == old_value) | |
420 | { | |
421 | label_seen = TRUE; | |
422 | symbol_set_frag (sym, frag_now); | |
423 | S_SET_VALUE (sym, new_value); | |
424 | } | |
425 | else if (label_seen && symbol_get_frag (sym) != old_frag) | |
426 | break; | |
427 | } | |
428 | record_alignment (now_seg, align); | |
429 | } | |
430 | } | |
431 | ||
432 | \f | |
433 | /** Support for self-check mode. */ | |
434 | ||
435 | /* Mode of the assembler. */ | |
436 | typedef enum | |
437 | { | |
438 | NIOS2_MODE_ASSEMBLE, /* Ordinary operation. */ | |
439 | NIOS2_MODE_TEST /* Hidden mode used for self testing. */ | |
440 | } NIOS2_MODE; | |
441 | ||
442 | static NIOS2_MODE nios2_mode = NIOS2_MODE_ASSEMBLE; | |
443 | ||
444 | /* This function is used to in self-checking mode | |
445 | to check the assembled instruction | |
446 | opcode should be the assembled opcode, and exp_opcode | |
447 | the parsed string representing the expected opcode. */ | |
448 | static void | |
449 | nios2_check_assembly (unsigned int opcode, const char *exp_opcode) | |
450 | { | |
451 | if (nios2_mode == NIOS2_MODE_TEST) | |
452 | { | |
453 | if (exp_opcode == NULL) | |
454 | as_bad (_("expecting opcode string in self test mode")); | |
455 | else if (opcode != strtoul (exp_opcode, NULL, 16)) | |
456 | as_bad (_("assembly 0x%08x, expected %s"), opcode, exp_opcode); | |
457 | } | |
458 | } | |
459 | ||
460 | \f | |
461 | /** Support for machine-dependent assembler directives. */ | |
462 | /* Handle the .align pseudo-op. This aligns to a power of two. It | |
463 | also adjusts any current instruction label. We treat this the same | |
464 | way the MIPS port does: .align 0 turns off auto alignment. */ | |
465 | static void | |
466 | s_nios2_align (int ignore ATTRIBUTE_UNUSED) | |
467 | { | |
468 | int align; | |
469 | char fill; | |
470 | const char *pfill = NULL; | |
471 | long max_alignment = 15; | |
472 | ||
473 | align = get_absolute_expression (); | |
474 | if (align > max_alignment) | |
475 | { | |
476 | align = max_alignment; | |
477 | as_bad (_("Alignment too large: %d. assumed"), align); | |
478 | } | |
479 | else if (align < 0) | |
480 | { | |
481 | as_warn (_("Alignment negative: 0 assumed")); | |
482 | align = 0; | |
483 | } | |
484 | ||
485 | if (*input_line_pointer == ',') | |
486 | { | |
487 | input_line_pointer++; | |
488 | fill = get_absolute_expression (); | |
489 | pfill = (const char *) &fill; | |
490 | } | |
491 | else if (subseg_text_p (now_seg)) | |
c8c8175b | 492 | pfill = (const char *) nop32; |
36591ba1 SL |
493 | else |
494 | { | |
495 | pfill = NULL; | |
496 | nios2_last_label = NULL; | |
497 | } | |
498 | ||
499 | if (align != 0) | |
500 | { | |
501 | nios2_auto_align_on = 1; | |
502 | nios2_align (align, pfill, nios2_last_label); | |
503 | nios2_last_label = NULL; | |
504 | } | |
505 | else | |
506 | nios2_auto_align_on = 0; | |
507 | ||
508 | demand_empty_rest_of_line (); | |
509 | } | |
510 | ||
511 | /* Handle the .text pseudo-op. This is like the usual one, but it | |
512 | clears the saved last label and resets known alignment. */ | |
513 | static void | |
514 | s_nios2_text (int i) | |
515 | { | |
516 | s_text (i); | |
517 | nios2_last_label = NULL; | |
518 | nios2_current_align = 0; | |
519 | nios2_current_align_seg = now_seg; | |
520 | } | |
521 | ||
522 | /* Handle the .data pseudo-op. This is like the usual one, but it | |
523 | clears the saved last label and resets known alignment. */ | |
524 | static void | |
525 | s_nios2_data (int i) | |
526 | { | |
527 | s_data (i); | |
528 | nios2_last_label = NULL; | |
529 | nios2_current_align = 0; | |
530 | nios2_current_align_seg = now_seg; | |
531 | } | |
532 | ||
533 | /* Handle the .section pseudo-op. This is like the usual one, but it | |
534 | clears the saved last label and resets known alignment. */ | |
535 | static void | |
536 | s_nios2_section (int ignore) | |
537 | { | |
538 | obj_elf_section (ignore); | |
539 | nios2_last_label = NULL; | |
540 | nios2_current_align = 0; | |
541 | nios2_current_align_seg = now_seg; | |
542 | } | |
543 | ||
544 | /* Explicitly unaligned cons. */ | |
545 | static void | |
546 | s_nios2_ucons (int nbytes) | |
547 | { | |
548 | int hold; | |
549 | hold = nios2_auto_align_on; | |
550 | nios2_auto_align_on = 0; | |
551 | cons (nbytes); | |
552 | nios2_auto_align_on = hold; | |
553 | } | |
554 | ||
555 | /* Handle the .sdata directive. */ | |
556 | static void | |
557 | s_nios2_sdata (int ignore ATTRIBUTE_UNUSED) | |
558 | { | |
559 | get_absolute_expression (); /* Ignored. */ | |
560 | subseg_new (".sdata", 0); | |
561 | demand_empty_rest_of_line (); | |
562 | } | |
563 | ||
564 | /* .set sets assembler options eg noat/at and is also used | |
565 | to set symbol values (.equ, .equiv ). */ | |
566 | static void | |
567 | s_nios2_set (int equiv) | |
568 | { | |
2e57ce7b | 569 | char *save = input_line_pointer; |
d02603dc NC |
570 | char *directive; |
571 | char delim = get_symbol_name (&directive); | |
36591ba1 | 572 | char *endline = input_line_pointer; |
d02603dc NC |
573 | |
574 | (void) restore_line_pointer (delim); | |
36591ba1 SL |
575 | |
576 | /* We only want to handle ".set XXX" if the | |
577 | user has tried ".set XXX, YYY" they are not | |
578 | trying a directive. This prevents | |
579 | us from polluting the name space. */ | |
580 | SKIP_WHITESPACE (); | |
3739860c | 581 | if (is_end_of_line[(unsigned char) *input_line_pointer]) |
36591ba1 SL |
582 | { |
583 | bfd_boolean done = TRUE; | |
584 | *endline = 0; | |
3739860c | 585 | |
36591ba1 SL |
586 | if (!strcmp (directive, "noat")) |
587 | nios2_as_options.noat = TRUE; | |
588 | else if (!strcmp (directive, "at")) | |
589 | nios2_as_options.noat = FALSE; | |
590 | else if (!strcmp (directive, "nobreak")) | |
591 | nios2_as_options.nobreak = TRUE; | |
592 | else if (!strcmp (directive, "break")) | |
593 | nios2_as_options.nobreak = FALSE; | |
594 | else if (!strcmp (directive, "norelax")) | |
595 | nios2_as_options.relax = relax_none; | |
596 | else if (!strcmp (directive, "relaxsection")) | |
597 | nios2_as_options.relax = relax_section; | |
598 | else if (!strcmp (directive, "relaxall")) | |
599 | nios2_as_options.relax = relax_all; | |
600 | else | |
601 | done = FALSE; | |
3739860c | 602 | |
36591ba1 SL |
603 | if (done) |
604 | { | |
605 | *endline = delim; | |
606 | demand_empty_rest_of_line (); | |
607 | return; | |
608 | } | |
609 | } | |
610 | ||
611 | /* If we fall through to here, either we have ".set XXX, YYY" | |
3739860c | 612 | or we have ".set XXX" where XXX is unknown or we have |
36591ba1 | 613 | a syntax error. */ |
2e57ce7b | 614 | input_line_pointer = save; |
36591ba1 SL |
615 | s_set (equiv); |
616 | } | |
617 | ||
618 | /* Machine-dependent assembler directives. | |
619 | Format of each entry is: | |
620 | { "directive", handler_func, param } */ | |
621 | const pseudo_typeS md_pseudo_table[] = { | |
622 | {"align", s_nios2_align, 0}, | |
623 | {"text", s_nios2_text, 0}, | |
624 | {"data", s_nios2_data, 0}, | |
625 | {"section", s_nios2_section, 0}, | |
626 | {"section.s", s_nios2_section, 0}, | |
627 | {"sect", s_nios2_section, 0}, | |
628 | {"sect.s", s_nios2_section, 0}, | |
629 | /* .dword and .half are included for compatibility with MIPS. */ | |
630 | {"dword", cons, 8}, | |
631 | {"half", cons, 2}, | |
632 | /* NIOS2 native word size is 4 bytes, so we override | |
633 | the GAS default of 2. */ | |
634 | {"word", cons, 4}, | |
635 | /* Explicitly unaligned directives. */ | |
636 | {"2byte", s_nios2_ucons, 2}, | |
637 | {"4byte", s_nios2_ucons, 4}, | |
638 | {"8byte", s_nios2_ucons, 8}, | |
639 | {"16byte", s_nios2_ucons, 16}, | |
640 | #ifdef OBJ_ELF | |
641 | {"sdata", s_nios2_sdata, 0}, | |
642 | #endif | |
643 | {"set", s_nios2_set, 0}, | |
644 | {NULL, NULL, 0} | |
645 | }; | |
646 | ||
647 | \f | |
648 | /** Relaxation support. */ | |
649 | ||
650 | /* We support two relaxation modes: a limited PC-relative mode with | |
651 | -relax-section (the default), and an absolute jump mode with -relax-all. | |
652 | ||
653 | Nios II PC-relative branch instructions only support 16-bit offsets. | |
654 | And, there's no good way to add a 32-bit constant to the PC without | |
655 | using two registers. | |
3739860c | 656 | |
36591ba1 SL |
657 | To deal with this, for the pc-relative relaxation mode we convert |
658 | br label | |
659 | into a series of 16-bit adds, like: | |
660 | nextpc at | |
661 | addi at, at, 32767 | |
662 | ... | |
663 | addi at, at, remainder | |
664 | jmp at | |
665 | ||
666 | Similarly, conditional branches are converted from | |
667 | b(condition) r, s, label | |
668 | into a series like: | |
669 | b(opposite condition) r, s, skip | |
670 | nextpc at | |
671 | addi at, at, 32767 | |
672 | ... | |
673 | addi at, at, remainder | |
674 | jmp at | |
675 | skip: | |
676 | ||
677 | The compiler can do a better job, either by converting the branch | |
678 | directly into a JMP (going through the GOT for PIC) or by allocating | |
679 | a second register for the 32-bit displacement. | |
680 | ||
681 | For the -relax-all relaxation mode, the conversions are | |
682 | movhi at, %hi(symbol+offset) | |
683 | ori at, %lo(symbol+offset) | |
684 | jmp at | |
685 | and | |
686 | b(opposite condition), r, s, skip | |
687 | movhi at, %hi(symbol+offset) | |
688 | ori at, %lo(symbol+offset) | |
689 | jmp at | |
690 | skip: | |
691 | respectively. | |
c8c8175b SL |
692 | |
693 | 16-bit CDX branch instructions are relaxed first into equivalent | |
694 | 32-bit branches and then the above transformations are applied | |
3739860c | 695 | if necessary. |
c8c8175b | 696 | |
36591ba1 SL |
697 | */ |
698 | ||
699 | /* Arbitrarily limit the number of addis we can insert; we need to be able | |
700 | to specify the maximum growth size for each frag that contains a | |
701 | relaxable branch. There's no point in specifying a huge number here | |
702 | since that means the assembler needs to allocate that much extra | |
703 | memory for every branch, and almost no real code will ever need it. | |
704 | Plus, as already noted a better solution is to just use a jmp, or | |
705 | allocate a second register to hold a 32-bit displacement. | |
706 | FIXME: Rather than making this a constant, it could be controlled by | |
707 | a command-line argument. */ | |
708 | #define RELAX_MAX_ADDI 32 | |
709 | ||
710 | /* The fr_subtype field represents the target-specific relocation state. | |
711 | It has type relax_substateT (unsigned int). We use it to track the | |
712 | number of addis necessary, plus a bit to track whether this is a | |
c8c8175b | 713 | conditional branch and a bit for 16-bit CDX instructions. |
36591ba1 SL |
714 | Regardless of the smaller RELAX_MAX_ADDI limit, we reserve 16 bits |
715 | in the fr_subtype to encode the number of addis so that the whole | |
716 | theoretically-valid range is representable. | |
717 | For the -relax-all mode, N = 0 represents an in-range branch and N = 1 | |
718 | represents a branch that needs to be relaxed. */ | |
719 | #define UBRANCH (0 << 16) | |
720 | #define CBRANCH (1 << 16) | |
c8c8175b | 721 | #define CDXBRANCH (1 << 17) |
36591ba1 SL |
722 | #define IS_CBRANCH(SUBTYPE) ((SUBTYPE) & CBRANCH) |
723 | #define IS_UBRANCH(SUBTYPE) (!IS_CBRANCH (SUBTYPE)) | |
c8c8175b | 724 | #define IS_CDXBRANCH(SUBTYPE) ((SUBTYPE) & CDXBRANCH) |
36591ba1 SL |
725 | #define UBRANCH_SUBTYPE(N) (UBRANCH | (N)) |
726 | #define CBRANCH_SUBTYPE(N) (CBRANCH | (N)) | |
c8c8175b SL |
727 | #define CDX_UBRANCH_SUBTYPE(N) (CDXBRANCH | UBRANCH | (N)) |
728 | #define CDX_CBRANCH_SUBTYPE(N) (CDXBRANCH | CBRANCH | (N)) | |
36591ba1 SL |
729 | #define SUBTYPE_ADDIS(SUBTYPE) ((SUBTYPE) & 0xffff) |
730 | ||
731 | /* For the -relax-section mode, unconditional branches require 2 extra i | |
732 | nstructions besides the addis, conditional branches require 3. */ | |
733 | #define UBRANCH_ADDIS_TO_SIZE(N) (((N) + 2) * 4) | |
734 | #define CBRANCH_ADDIS_TO_SIZE(N) (((N) + 3) * 4) | |
735 | ||
736 | /* For the -relax-all mode, unconditional branches require 3 instructions | |
737 | and conditional branches require 4. */ | |
738 | #define UBRANCH_JUMP_SIZE 12 | |
739 | #define CBRANCH_JUMP_SIZE 16 | |
740 | ||
741 | /* Maximum sizes of relaxation sequences. */ | |
742 | #define UBRANCH_MAX_SIZE \ | |
743 | (nios2_as_options.relax == relax_all \ | |
744 | ? UBRANCH_JUMP_SIZE \ | |
745 | : UBRANCH_ADDIS_TO_SIZE (RELAX_MAX_ADDI)) | |
746 | #define CBRANCH_MAX_SIZE \ | |
747 | (nios2_as_options.relax == relax_all \ | |
748 | ? CBRANCH_JUMP_SIZE \ | |
749 | : CBRANCH_ADDIS_TO_SIZE (RELAX_MAX_ADDI)) | |
750 | ||
751 | /* Register number of AT, the assembler temporary. */ | |
752 | #define AT_REGNUM 1 | |
753 | ||
754 | /* Determine how many bytes are required to represent the sequence | |
755 | indicated by SUBTYPE. */ | |
756 | static int | |
757 | nios2_relax_subtype_size (relax_substateT subtype) | |
758 | { | |
759 | int n = SUBTYPE_ADDIS (subtype); | |
760 | if (n == 0) | |
761 | /* Regular conditional/unconditional branch instruction. */ | |
c8c8175b | 762 | return (IS_CDXBRANCH (subtype) ? 2 : 4); |
36591ba1 SL |
763 | else if (nios2_as_options.relax == relax_all) |
764 | return (IS_CBRANCH (subtype) ? CBRANCH_JUMP_SIZE : UBRANCH_JUMP_SIZE); | |
765 | else if (IS_CBRANCH (subtype)) | |
766 | return CBRANCH_ADDIS_TO_SIZE (n); | |
767 | else | |
768 | return UBRANCH_ADDIS_TO_SIZE (n); | |
769 | } | |
770 | ||
771 | /* Estimate size of fragp before relaxation. | |
772 | This could also examine the offset in fragp and adjust | |
773 | fragp->fr_subtype, but we will do that in nios2_relax_frag anyway. */ | |
774 | int | |
775 | md_estimate_size_before_relax (fragS *fragp, segT segment ATTRIBUTE_UNUSED) | |
776 | { | |
777 | return nios2_relax_subtype_size (fragp->fr_subtype); | |
778 | } | |
779 | ||
780 | /* Implement md_relax_frag, returning the change in size of the frag. */ | |
781 | long | |
782 | nios2_relax_frag (segT segment, fragS *fragp, long stretch) | |
783 | { | |
784 | addressT target = fragp->fr_offset; | |
785 | relax_substateT subtype = fragp->fr_subtype; | |
786 | symbolS *symbolp = fragp->fr_symbol; | |
787 | ||
788 | if (symbolp) | |
789 | { | |
790 | fragS *sym_frag = symbol_get_frag (symbolp); | |
791 | offsetT offset; | |
792 | int n; | |
c8c8175b | 793 | bfd_boolean is_cdx = FALSE; |
36591ba1 SL |
794 | |
795 | target += S_GET_VALUE (symbolp); | |
796 | ||
797 | /* See comments in write.c:relax_frag about handling of stretch. */ | |
798 | if (stretch != 0 | |
799 | && sym_frag->relax_marker != fragp->relax_marker) | |
800 | { | |
801 | if (stretch < 0 || sym_frag->region == fragp->region) | |
802 | target += stretch; | |
803 | else if (target < fragp->fr_address) | |
804 | target = fragp->fr_next->fr_address + stretch; | |
805 | } | |
806 | ||
96ba4233 SL |
807 | /* We subtract fr_var (4 for 32-bit insns) because all pc relative |
808 | branches are from the next instruction. */ | |
809 | offset = target - fragp->fr_address - fragp->fr_fix - fragp->fr_var; | |
c8c8175b SL |
810 | if (IS_CDXBRANCH (subtype) && IS_UBRANCH (subtype) |
811 | && offset >= -1024 && offset < 1024) | |
812 | /* PC-relative CDX branch with 11-bit offset. */ | |
813 | is_cdx = TRUE; | |
814 | else if (IS_CDXBRANCH (subtype) && IS_CBRANCH (subtype) | |
815 | && offset >= -128 && offset < 128) | |
816 | /* PC-relative CDX branch with 8-bit offset. */ | |
817 | is_cdx = TRUE; | |
818 | else if (offset >= -32768 && offset < 32768) | |
36591ba1 SL |
819 | /* Fits in PC-relative branch. */ |
820 | n = 0; | |
821 | else if (nios2_as_options.relax == relax_all) | |
822 | /* Convert to jump. */ | |
823 | n = 1; | |
824 | else if (nios2_as_options.relax == relax_section | |
825 | && S_GET_SEGMENT (symbolp) == segment | |
826 | && S_IS_DEFINED (symbolp)) | |
827 | /* Attempt a PC-relative relaxation on a branch to a defined | |
828 | symbol in the same segment. */ | |
829 | { | |
830 | /* The relaxation for conditional branches is offset by 4 | |
831 | bytes because we insert the inverted branch around the | |
832 | sequence. */ | |
833 | if (IS_CBRANCH (subtype)) | |
834 | offset = offset - 4; | |
835 | if (offset > 0) | |
836 | n = offset / 32767 + 1; | |
837 | else | |
838 | n = offset / -32768 + 1; | |
839 | ||
840 | /* Bail out immediately if relaxation has failed. If we try to | |
841 | defer the diagnostic to md_convert_frag, some pathological test | |
842 | cases (e.g. gcc/testsuite/gcc.c-torture/compile/20001226-1.c) | |
843 | apparently never converge. By returning 0 here we could pretend | |
844 | to the caller that nothing has changed, but that leaves things | |
845 | in an inconsistent state when we get to md_convert_frag. */ | |
846 | if (n > RELAX_MAX_ADDI) | |
847 | { | |
848 | as_bad_where (fragp->fr_file, fragp->fr_line, | |
849 | _("branch offset out of range\n")); | |
850 | as_fatal (_("branch relaxation failed\n")); | |
851 | } | |
852 | } | |
853 | else | |
854 | /* We cannot handle this case, diagnose overflow later. */ | |
855 | return 0; | |
856 | ||
c8c8175b SL |
857 | if (is_cdx) |
858 | fragp->fr_subtype = subtype; | |
859 | else if (IS_CBRANCH (subtype)) | |
36591ba1 SL |
860 | fragp->fr_subtype = CBRANCH_SUBTYPE (n); |
861 | else | |
862 | fragp->fr_subtype = UBRANCH_SUBTYPE (n); | |
863 | ||
864 | return (nios2_relax_subtype_size (fragp->fr_subtype) | |
865 | - nios2_relax_subtype_size (subtype)); | |
866 | } | |
867 | ||
868 | /* If we got here, it's probably an error. */ | |
869 | return 0; | |
870 | } | |
871 | ||
872 | ||
873 | /* Complete fragp using the data from the relaxation pass. */ | |
874 | void | |
875 | md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED, | |
876 | fragS *fragp) | |
877 | { | |
878 | char *buffer = fragp->fr_literal + fragp->fr_fix; | |
879 | relax_substateT subtype = fragp->fr_subtype; | |
880 | int n = SUBTYPE_ADDIS (subtype); | |
881 | addressT target = fragp->fr_offset; | |
882 | symbolS *symbolp = fragp->fr_symbol; | |
883 | offsetT offset; | |
c8c8175b | 884 | unsigned int addend_mask, addi_mask, op; |
36591ba1 SL |
885 | offsetT addend, remainder; |
886 | int i; | |
c8c8175b SL |
887 | bfd_boolean is_r2 = (bfd_get_mach (stdoutput) == bfd_mach_nios2r2); |
888 | ||
889 | /* If this is a CDX branch we're not relaxing, just generate the fixup. */ | |
890 | if (IS_CDXBRANCH (subtype)) | |
891 | { | |
892 | gas_assert (is_r2); | |
893 | fix_new (fragp, fragp->fr_fix, 2, fragp->fr_symbol, | |
894 | fragp->fr_offset, 1, | |
895 | (IS_UBRANCH (subtype) | |
896 | ? BFD_RELOC_NIOS2_R2_I10_1_PCREL | |
897 | : BFD_RELOC_NIOS2_R2_T1I7_1_PCREL)); | |
898 | fragp->fr_fix += 2; | |
899 | return; | |
900 | } | |
901 | ||
902 | /* If this is a CDX branch we are relaxing, turn it into an equivalent | |
903 | 32-bit branch and then fall through to the normal non-CDX cases. */ | |
904 | if (fragp->fr_var == 2) | |
905 | { | |
906 | unsigned int opcode = md_chars_to_number (buffer, 2); | |
907 | gas_assert (is_r2); | |
908 | if (IS_CBRANCH (subtype)) | |
909 | { | |
910 | unsigned int reg = nios2_r2_reg3_mappings[GET_IW_T1I7_A3 (opcode)]; | |
911 | if (GET_IW_R2_OP (opcode) == R2_OP_BNEZ_N) | |
912 | opcode = MATCH_R2_BNE | SET_IW_F2I16_A (reg); | |
913 | else | |
914 | opcode = MATCH_R2_BEQ | SET_IW_F2I16_A (reg); | |
915 | } | |
916 | else | |
917 | opcode = MATCH_R2_BR; | |
918 | md_number_to_chars (buffer, opcode, 4); | |
919 | fragp->fr_var = 4; | |
920 | } | |
36591ba1 SL |
921 | |
922 | /* If we didn't or can't relax, this is a regular branch instruction. | |
923 | We just need to generate the fixup for the symbol and offset. */ | |
924 | if (n == 0) | |
925 | { | |
c8c8175b SL |
926 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, |
927 | fragp->fr_offset, 1, BFD_RELOC_16_PCREL); | |
36591ba1 SL |
928 | fragp->fr_fix += 4; |
929 | return; | |
930 | } | |
931 | ||
932 | /* Replace the cbranch at fr_fix with one that has the opposite condition | |
933 | in order to jump around the block of instructions we'll be adding. */ | |
934 | if (IS_CBRANCH (subtype)) | |
935 | { | |
936 | unsigned int br_opcode; | |
96ba4233 | 937 | unsigned int old_op, new_op; |
36591ba1 SL |
938 | int nbytes; |
939 | ||
940 | /* Account for the nextpc and jmp in the pc-relative case, or the two | |
941 | load instructions and jump in the absolute case. */ | |
942 | if (nios2_as_options.relax == relax_section) | |
943 | nbytes = (n + 2) * 4; | |
944 | else | |
945 | nbytes = 12; | |
946 | ||
947 | br_opcode = md_chars_to_number (buffer, 4); | |
c8c8175b | 948 | if (is_r2) |
36591ba1 | 949 | { |
c8c8175b SL |
950 | old_op = GET_IW_R2_OP (br_opcode); |
951 | switch (old_op) | |
952 | { | |
953 | case R2_OP_BEQ: | |
954 | new_op = R2_OP_BNE; | |
955 | break; | |
956 | case R2_OP_BNE: | |
957 | new_op = R2_OP_BEQ; | |
958 | break; | |
959 | case R2_OP_BGE: | |
960 | new_op = R2_OP_BLT; | |
961 | break; | |
962 | case R2_OP_BGEU: | |
963 | new_op = R2_OP_BLTU; | |
964 | break; | |
965 | case R2_OP_BLT: | |
966 | new_op = R2_OP_BGE; | |
967 | break; | |
968 | case R2_OP_BLTU: | |
969 | new_op = R2_OP_BGEU; | |
970 | break; | |
971 | default: | |
972 | abort (); | |
973 | } | |
974 | br_opcode = ((br_opcode & ~IW_R2_OP_SHIFTED_MASK) | |
975 | | SET_IW_R2_OP (new_op)); | |
976 | br_opcode = br_opcode | SET_IW_F2I16_IMM16 (nbytes); | |
977 | } | |
978 | else | |
979 | { | |
980 | old_op = GET_IW_R1_OP (br_opcode); | |
981 | switch (old_op) | |
982 | { | |
983 | case R1_OP_BEQ: | |
984 | new_op = R1_OP_BNE; | |
985 | break; | |
986 | case R1_OP_BNE: | |
987 | new_op = R1_OP_BEQ; | |
988 | break; | |
989 | case R1_OP_BGE: | |
990 | new_op = R1_OP_BLT; | |
991 | break; | |
992 | case R1_OP_BGEU: | |
993 | new_op = R1_OP_BLTU; | |
994 | break; | |
995 | case R1_OP_BLT: | |
996 | new_op = R1_OP_BGE; | |
997 | break; | |
998 | case R1_OP_BLTU: | |
999 | new_op = R1_OP_BGEU; | |
1000 | break; | |
1001 | default: | |
1002 | abort (); | |
1003 | } | |
1004 | br_opcode = ((br_opcode & ~IW_R1_OP_SHIFTED_MASK) | |
1005 | | SET_IW_R1_OP (new_op)); | |
1006 | br_opcode = br_opcode | SET_IW_I_IMM16 (nbytes); | |
36591ba1 | 1007 | } |
36591ba1 SL |
1008 | md_number_to_chars (buffer, br_opcode, 4); |
1009 | fragp->fr_fix += 4; | |
1010 | buffer += 4; | |
1011 | } | |
1012 | ||
1013 | /* Load at for the PC-relative case. */ | |
1014 | if (nios2_as_options.relax == relax_section) | |
1015 | { | |
1016 | /* Insert the nextpc instruction. */ | |
c8c8175b SL |
1017 | if (is_r2) |
1018 | op = MATCH_R2_NEXTPC | SET_IW_F3X6L5_C (AT_REGNUM); | |
1019 | else | |
1020 | op = MATCH_R1_NEXTPC | SET_IW_R_C (AT_REGNUM); | |
1021 | md_number_to_chars (buffer, op, 4); | |
36591ba1 SL |
1022 | fragp->fr_fix += 4; |
1023 | buffer += 4; | |
3739860c | 1024 | |
36591ba1 SL |
1025 | /* We need to know whether the offset is positive or negative. */ |
1026 | target += S_GET_VALUE (symbolp); | |
1027 | offset = target - fragp->fr_address - fragp->fr_fix; | |
1028 | if (offset > 0) | |
1029 | addend = 32767; | |
1030 | else | |
1031 | addend = -32768; | |
c8c8175b SL |
1032 | if (is_r2) |
1033 | addend_mask = SET_IW_F2I16_IMM16 ((unsigned int)addend); | |
1034 | else | |
1035 | addend_mask = SET_IW_I_IMM16 ((unsigned int)addend); | |
36591ba1 SL |
1036 | |
1037 | /* Insert n-1 addi instructions. */ | |
c8c8175b SL |
1038 | if (is_r2) |
1039 | addi_mask = (MATCH_R2_ADDI | |
1040 | | SET_IW_F2I16_B (AT_REGNUM) | |
1041 | | SET_IW_F2I16_A (AT_REGNUM)); | |
1042 | else | |
1043 | addi_mask = (MATCH_R1_ADDI | |
1044 | | SET_IW_I_B (AT_REGNUM) | |
1045 | | SET_IW_I_A (AT_REGNUM)); | |
36591ba1 SL |
1046 | for (i = 0; i < n - 1; i ++) |
1047 | { | |
1048 | md_number_to_chars (buffer, addi_mask | addend_mask, 4); | |
1049 | fragp->fr_fix += 4; | |
1050 | buffer += 4; | |
1051 | } | |
1052 | ||
1053 | /* Insert the last addi instruction to hold the remainder. */ | |
1054 | remainder = offset - addend * (n - 1); | |
1055 | gas_assert (remainder >= -32768 && remainder <= 32767); | |
c8c8175b SL |
1056 | if (is_r2) |
1057 | addend_mask = SET_IW_F2I16_IMM16 ((unsigned int)remainder); | |
1058 | else | |
1059 | addend_mask = SET_IW_I_IMM16 ((unsigned int)remainder); | |
36591ba1 SL |
1060 | md_number_to_chars (buffer, addi_mask | addend_mask, 4); |
1061 | fragp->fr_fix += 4; | |
1062 | buffer += 4; | |
1063 | } | |
1064 | ||
1065 | /* Load at for the absolute case. */ | |
1066 | else | |
1067 | { | |
c8c8175b SL |
1068 | if (is_r2) |
1069 | op = MATCH_R2_ORHI | SET_IW_F2I16_B (AT_REGNUM) | SET_IW_F2I16_A (0); | |
1070 | else | |
1071 | op = MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM) | SET_IW_I_A (0); | |
1072 | md_number_to_chars (buffer, op, 4); | |
36591ba1 SL |
1073 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, |
1074 | 0, BFD_RELOC_NIOS2_HI16); | |
1075 | fragp->fr_fix += 4; | |
1076 | buffer += 4; | |
c8c8175b SL |
1077 | if (is_r2) |
1078 | op = (MATCH_R2_ORI | SET_IW_F2I16_B (AT_REGNUM) | |
1079 | | SET_IW_F2I16_A (AT_REGNUM)); | |
1080 | else | |
1081 | op = (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM) | |
1082 | | SET_IW_I_A (AT_REGNUM)); | |
1083 | md_number_to_chars (buffer, op, 4); | |
36591ba1 SL |
1084 | fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, |
1085 | 0, BFD_RELOC_NIOS2_LO16); | |
1086 | fragp->fr_fix += 4; | |
1087 | buffer += 4; | |
1088 | } | |
1089 | ||
1090 | /* Insert the jmp instruction. */ | |
c8c8175b SL |
1091 | if (is_r2) |
1092 | op = MATCH_R2_JMP | SET_IW_F3X6L5_A (AT_REGNUM); | |
1093 | else | |
1094 | op = MATCH_R1_JMP | SET_IW_R_A (AT_REGNUM); | |
1095 | md_number_to_chars (buffer, op, 4); | |
36591ba1 SL |
1096 | fragp->fr_fix += 4; |
1097 | buffer += 4; | |
1098 | } | |
1099 | ||
1100 | \f | |
1101 | /** Fixups and overflow checking. */ | |
1102 | ||
1103 | /* Check a fixup for overflow. */ | |
1104 | static bfd_boolean | |
1105 | nios2_check_overflow (valueT fixup, reloc_howto_type *howto) | |
1106 | { | |
c8c8175b SL |
1107 | /* If there is a rightshift, check that the low-order bits are |
1108 | zero before applying it. */ | |
1109 | if (howto->rightshift) | |
1110 | { | |
1111 | if ((~(~((valueT) 0) << howto->rightshift) & fixup) | |
1112 | && howto->complain_on_overflow != complain_overflow_dont) | |
1113 | return TRUE; | |
1114 | fixup = ((signed)fixup) >> howto->rightshift; | |
1115 | } | |
36591ba1 SL |
1116 | |
1117 | /* Check for overflow - return TRUE if overflow, FALSE if not. */ | |
1118 | switch (howto->complain_on_overflow) | |
1119 | { | |
1120 | case complain_overflow_dont: | |
1121 | break; | |
1122 | case complain_overflow_bitfield: | |
1123 | if ((fixup >> howto->bitsize) != 0 | |
1124 | && ((signed) fixup >> howto->bitsize) != -1) | |
1125 | return TRUE; | |
1126 | break; | |
1127 | case complain_overflow_signed: | |
1128 | if ((fixup & 0x80000000) > 0) | |
1129 | { | |
1130 | /* Check for negative overflow. */ | |
c8c8175b | 1131 | if ((signed) fixup < ((signed) ~0 << (howto->bitsize-1))) |
36591ba1 SL |
1132 | return TRUE; |
1133 | } | |
1134 | else | |
1135 | { | |
1136 | /* Check for positive overflow. */ | |
1137 | if (fixup >= ((unsigned) 1 << (howto->bitsize - 1))) | |
1138 | return TRUE; | |
1139 | } | |
1140 | break; | |
1141 | case complain_overflow_unsigned: | |
1142 | if ((fixup >> howto->bitsize) != 0) | |
1143 | return TRUE; | |
1144 | break; | |
1145 | default: | |
1146 | as_bad (_("error checking for overflow - broken assembler")); | |
1147 | break; | |
1148 | } | |
1149 | return FALSE; | |
1150 | } | |
1151 | ||
1152 | /* Emit diagnostic for fixup overflow. */ | |
1153 | static void | |
1154 | nios2_diagnose_overflow (valueT fixup, reloc_howto_type *howto, | |
1155 | fixS *fixP, valueT value) | |
1156 | { | |
1157 | if (fixP->fx_r_type == BFD_RELOC_8 | |
1158 | || fixP->fx_r_type == BFD_RELOC_16 | |
1159 | || fixP->fx_r_type == BFD_RELOC_32) | |
1160 | /* These relocs are against data, not instructions. */ | |
1161 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1162 | _("immediate value 0x%x truncated to 0x%x"), | |
1163 | (unsigned int) fixup, | |
1164 | (unsigned int) (~(~(valueT) 0 << howto->bitsize) & fixup)); | |
1165 | else | |
1166 | { | |
1167 | /* What opcode is the instruction? This will determine | |
1168 | whether we check for overflow in immediate values | |
1169 | and what error message we get. */ | |
1170 | const struct nios2_opcode *opcode; | |
1171 | enum overflow_type overflow_msg_type; | |
1172 | unsigned int range_min; | |
1173 | unsigned int range_max; | |
1174 | unsigned int address; | |
96ba4233 | 1175 | |
b4714c7c | 1176 | opcode = nios2_find_opcode_hash (value, bfd_get_mach (stdoutput)); |
36591ba1 | 1177 | gas_assert (opcode); |
96ba4233 | 1178 | gas_assert (fixP->fx_size == opcode->size); |
36591ba1 SL |
1179 | overflow_msg_type = opcode->overflow_msg; |
1180 | switch (overflow_msg_type) | |
1181 | { | |
1182 | case call_target_overflow: | |
1183 | range_min | |
1184 | = ((fixP->fx_frag->fr_address + fixP->fx_where) & 0xf0000000); | |
1185 | range_max = range_min + 0x0fffffff; | |
1186 | address = fixup | range_min; | |
3739860c | 1187 | |
36591ba1 SL |
1188 | as_bad_where (fixP->fx_file, fixP->fx_line, |
1189 | _("call target address 0x%08x out of range 0x%08x to 0x%08x"), | |
1190 | address, range_min, range_max); | |
1191 | break; | |
1192 | case branch_target_overflow: | |
c8c8175b SL |
1193 | if (opcode->format == iw_i_type || opcode->format == iw_F2I16_type) |
1194 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1195 | _("branch offset %d out of range %d to %d"), | |
1196 | (int)fixup, -32768, 32767); | |
1197 | else | |
1198 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1199 | _("branch offset %d out of range"), | |
1200 | (int)fixup); | |
36591ba1 SL |
1201 | break; |
1202 | case address_offset_overflow: | |
c8c8175b SL |
1203 | if (opcode->format == iw_i_type || opcode->format == iw_F2I16_type) |
1204 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1205 | _("%s offset %d out of range %d to %d"), | |
1206 | opcode->name, (int)fixup, -32768, 32767); | |
1207 | else | |
1208 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1209 | _("%s offset %d out of range"), | |
1210 | opcode->name, (int)fixup); | |
36591ba1 SL |
1211 | break; |
1212 | case signed_immed16_overflow: | |
1213 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1214 | _("immediate value %d out of range %d to %d"), | |
1215 | (int)fixup, -32768, 32767); | |
1216 | break; | |
1217 | case unsigned_immed16_overflow: | |
1218 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1219 | _("immediate value %u out of range %u to %u"), | |
1220 | (unsigned int)fixup, 0, 65535); | |
1221 | break; | |
1222 | case unsigned_immed5_overflow: | |
1223 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1224 | _("immediate value %u out of range %u to %u"), | |
1225 | (unsigned int)fixup, 0, 31); | |
1226 | break; | |
c8c8175b SL |
1227 | case signed_immed12_overflow: |
1228 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1229 | _("immediate value %d out of range %d to %d"), | |
1230 | (int)fixup, -2048, 2047); | |
1231 | break; | |
36591ba1 SL |
1232 | case custom_opcode_overflow: |
1233 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1234 | _("custom instruction opcode %u out of range %u to %u"), | |
1235 | (unsigned int)fixup, 0, 255); | |
1236 | break; | |
1237 | default: | |
1238 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1239 | _("overflow in immediate argument")); | |
1240 | break; | |
1241 | } | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | /* Apply a fixup to the object file. */ | |
1246 | void | |
1247 | md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) | |
1248 | { | |
1249 | /* Assert that the fixup is one we can handle. */ | |
1250 | gas_assert (fixP != NULL && valP != NULL | |
1251 | && (fixP->fx_r_type == BFD_RELOC_8 | |
1252 | || fixP->fx_r_type == BFD_RELOC_16 | |
1253 | || fixP->fx_r_type == BFD_RELOC_32 | |
1254 | || fixP->fx_r_type == BFD_RELOC_64 | |
1255 | || fixP->fx_r_type == BFD_RELOC_NIOS2_S16 | |
1256 | || fixP->fx_r_type == BFD_RELOC_NIOS2_U16 | |
1257 | || fixP->fx_r_type == BFD_RELOC_16_PCREL | |
1258 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL26 | |
1259 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM5 | |
1260 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CACHE_OPX | |
1261 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM6 | |
1262 | || fixP->fx_r_type == BFD_RELOC_NIOS2_IMM8 | |
1263 | || fixP->fx_r_type == BFD_RELOC_NIOS2_HI16 | |
1264 | || fixP->fx_r_type == BFD_RELOC_NIOS2_LO16 | |
1265 | || fixP->fx_r_type == BFD_RELOC_NIOS2_HIADJ16 | |
1266 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GPREL | |
1267 | || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT | |
1268 | || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY | |
1269 | || fixP->fx_r_type == BFD_RELOC_NIOS2_UJMP | |
1270 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CJMP | |
1271 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALLR | |
1272 | || fixP->fx_r_type == BFD_RELOC_NIOS2_ALIGN | |
1273 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT16 | |
1274 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL16 | |
1275 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_LO | |
1276 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_HA | |
1277 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_GD16 | |
1278 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LDM16 | |
1279 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LDO16 | |
1280 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_IE16 | |
1281 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_LE16 | |
1282 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOTOFF | |
1283 | || fixP->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPREL | |
1c2de463 SL |
1284 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL26_NOAT |
1285 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT_LO | |
1286 | || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT_HA | |
1287 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL_LO | |
1288 | || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL_HA | |
c8c8175b SL |
1289 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_S12 |
1290 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_I10_1_PCREL | |
1291 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1I7_1_PCREL | |
1292 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1I7_2 | |
1293 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T2I4 | |
1294 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T2I4_1 | |
1295 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T2I4_2 | |
1296 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_X1I7_2 | |
1297 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_X2L5 | |
1298 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_F1I5_2 | |
1299 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_L5I4X1 | |
1300 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1X1I6 | |
1301 | || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1X1I6_2 | |
36591ba1 SL |
1302 | /* Add other relocs here as we generate them. */ |
1303 | )); | |
1304 | ||
1305 | if (fixP->fx_r_type == BFD_RELOC_64) | |
1306 | { | |
1307 | /* We may reach here due to .8byte directives, but we never output | |
3739860c | 1308 | BFD_RELOC_64; it must be resolved. */ |
36591ba1 SL |
1309 | if (fixP->fx_addsy != NULL) |
1310 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1311 | _("cannot create 64-bit relocation")); | |
1312 | else | |
1313 | { | |
1314 | md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, | |
1315 | *valP, 8); | |
1316 | fixP->fx_done = 1; | |
1317 | } | |
1318 | return; | |
1319 | } | |
1320 | ||
1321 | /* The value passed in valP can be the value of a fully | |
1322 | resolved expression, or it can be the value of a partially | |
1323 | resolved expression. In the former case, both fixP->fx_addsy | |
1324 | and fixP->fx_subsy are NULL, and fixP->fx_offset == *valP, and | |
1325 | we can fix up the instruction that fixP relates to. | |
1326 | In the latter case, one or both of fixP->fx_addsy and | |
1327 | fixP->fx_subsy are not NULL, and fixP->fx_offset may or may not | |
1328 | equal *valP. We don't need to check for fixP->fx_subsy being null | |
1329 | because the generic part of the assembler generates an error if | |
1330 | it is not an absolute symbol. */ | |
1331 | if (fixP->fx_addsy != NULL) | |
1332 | /* Partially resolved expression. */ | |
1333 | { | |
1334 | fixP->fx_addnumber = fixP->fx_offset; | |
1335 | fixP->fx_done = 0; | |
1336 | ||
1337 | switch (fixP->fx_r_type) | |
1338 | { | |
1339 | case BFD_RELOC_NIOS2_TLS_GD16: | |
1340 | case BFD_RELOC_NIOS2_TLS_LDM16: | |
1341 | case BFD_RELOC_NIOS2_TLS_LDO16: | |
1342 | case BFD_RELOC_NIOS2_TLS_IE16: | |
1343 | case BFD_RELOC_NIOS2_TLS_LE16: | |
1344 | case BFD_RELOC_NIOS2_TLS_DTPMOD: | |
1345 | case BFD_RELOC_NIOS2_TLS_DTPREL: | |
1346 | case BFD_RELOC_NIOS2_TLS_TPREL: | |
1347 | S_SET_THREAD_LOCAL (fixP->fx_addsy); | |
1348 | break; | |
1349 | default: | |
1350 | break; | |
1351 | } | |
1352 | } | |
1353 | else | |
1354 | /* Fully resolved fixup. */ | |
1355 | { | |
1356 | reloc_howto_type *howto | |
1357 | = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); | |
1358 | ||
1359 | if (howto == NULL) | |
1360 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1361 | _("relocation is not supported")); | |
1362 | else | |
1363 | { | |
1364 | valueT fixup = *valP; | |
1365 | valueT value; | |
1366 | char *buf; | |
1367 | ||
1368 | /* If this is a pc-relative relocation, we need to | |
1369 | subtract the current offset within the object file | |
1370 | FIXME : for some reason fixP->fx_pcrel isn't 1 when it should be | |
1371 | so I'm using the howto structure instead to determine this. */ | |
1372 | if (howto->pc_relative == 1) | |
c8c8175b SL |
1373 | { |
1374 | fixup = (fixup - (fixP->fx_frag->fr_address + fixP->fx_where | |
1375 | + fixP->fx_size)); | |
1376 | *valP = fixup; | |
1377 | } | |
36591ba1 SL |
1378 | |
1379 | /* Get the instruction or data to be fixed up. */ | |
1380 | buf = fixP->fx_frag->fr_literal + fixP->fx_where; | |
1381 | value = md_chars_to_number (buf, fixP->fx_size); | |
1382 | ||
1383 | /* Check for overflow, emitting a diagnostic if necessary. */ | |
1384 | if (nios2_check_overflow (fixup, howto)) | |
1385 | nios2_diagnose_overflow (fixup, howto, fixP, value); | |
1386 | ||
1387 | /* Apply the right shift. */ | |
1388 | fixup = ((signed)fixup) >> howto->rightshift; | |
1389 | ||
1390 | /* Truncate the fixup to right size. */ | |
1391 | switch (fixP->fx_r_type) | |
1392 | { | |
1393 | case BFD_RELOC_NIOS2_HI16: | |
1394 | fixup = (fixup >> 16) & 0xFFFF; | |
1395 | break; | |
1396 | case BFD_RELOC_NIOS2_LO16: | |
1397 | fixup = fixup & 0xFFFF; | |
1398 | break; | |
1399 | case BFD_RELOC_NIOS2_HIADJ16: | |
5d5755a7 SL |
1400 | fixup = ((((fixup >> 16) & 0xFFFF) + ((fixup >> 15) & 0x01)) |
1401 | & 0xFFFF); | |
36591ba1 SL |
1402 | break; |
1403 | default: | |
1404 | { | |
1405 | int n = sizeof (fixup) * 8 - howto->bitsize; | |
1406 | fixup = (fixup << n) >> n; | |
1407 | break; | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | /* Fix up the instruction. */ | |
1412 | value = (value & ~howto->dst_mask) | (fixup << howto->bitpos); | |
1413 | md_number_to_chars (buf, value, fixP->fx_size); | |
1414 | } | |
1415 | ||
1416 | fixP->fx_done = 1; | |
1417 | } | |
1418 | ||
1419 | if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) | |
1420 | { | |
1421 | fixP->fx_done = 0; | |
1422 | if (fixP->fx_addsy | |
1423 | && !S_IS_DEFINED (fixP->fx_addsy) && !S_IS_WEAK (fixP->fx_addsy)) | |
1424 | S_SET_WEAK (fixP->fx_addsy); | |
1425 | } | |
1426 | else if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) | |
1427 | fixP->fx_done = 0; | |
1428 | } | |
1429 | ||
1430 | ||
1431 | \f | |
1432 | /** Instruction parsing support. */ | |
1433 | ||
96ba4233 SL |
1434 | /* General internal error routine. */ |
1435 | ||
1436 | static void | |
1437 | bad_opcode (const struct nios2_opcode *op) | |
1438 | { | |
1439 | fprintf (stderr, _("internal error: broken opcode descriptor for `%s %s'\n"), | |
1440 | op->name, op->args); | |
1441 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
1442 | } | |
1443 | ||
36591ba1 SL |
1444 | /* Special relocation directive strings. */ |
1445 | ||
1446 | struct nios2_special_relocS | |
1447 | { | |
1448 | const char *string; | |
1449 | bfd_reloc_code_real_type reloc_type; | |
1450 | }; | |
1451 | ||
1c2de463 SL |
1452 | /* This table is sorted so that prefix strings are listed after the longer |
1453 | strings that include them -- e.g., %got after %got_hiadj, etc. */ | |
1454 | ||
36591ba1 SL |
1455 | struct nios2_special_relocS nios2_special_reloc[] = { |
1456 | {"%hiadj", BFD_RELOC_NIOS2_HIADJ16}, | |
1457 | {"%hi", BFD_RELOC_NIOS2_HI16}, | |
1458 | {"%lo", BFD_RELOC_NIOS2_LO16}, | |
1459 | {"%gprel", BFD_RELOC_NIOS2_GPREL}, | |
1c2de463 SL |
1460 | {"%call_lo", BFD_RELOC_NIOS2_CALL_LO}, |
1461 | {"%call_hiadj", BFD_RELOC_NIOS2_CALL_HA}, | |
36591ba1 SL |
1462 | {"%call", BFD_RELOC_NIOS2_CALL16}, |
1463 | {"%gotoff_lo", BFD_RELOC_NIOS2_GOTOFF_LO}, | |
1464 | {"%gotoff_hiadj", BFD_RELOC_NIOS2_GOTOFF_HA}, | |
1c2de463 SL |
1465 | {"%gotoff", BFD_RELOC_NIOS2_GOTOFF}, |
1466 | {"%got_hiadj", BFD_RELOC_NIOS2_GOT_HA}, | |
1467 | {"%got_lo", BFD_RELOC_NIOS2_GOT_LO}, | |
1468 | {"%got", BFD_RELOC_NIOS2_GOT16}, | |
36591ba1 SL |
1469 | {"%tls_gd", BFD_RELOC_NIOS2_TLS_GD16}, |
1470 | {"%tls_ldm", BFD_RELOC_NIOS2_TLS_LDM16}, | |
1471 | {"%tls_ldo", BFD_RELOC_NIOS2_TLS_LDO16}, | |
1472 | {"%tls_ie", BFD_RELOC_NIOS2_TLS_IE16}, | |
1473 | {"%tls_le", BFD_RELOC_NIOS2_TLS_LE16}, | |
36591ba1 SL |
1474 | }; |
1475 | ||
1476 | #define NIOS2_NUM_SPECIAL_RELOCS \ | |
1477 | (sizeof(nios2_special_reloc)/sizeof(nios2_special_reloc[0])) | |
1478 | const int nios2_num_special_relocs = NIOS2_NUM_SPECIAL_RELOCS; | |
1479 | ||
1480 | /* Creates a new nios2_insn_relocS and returns a pointer to it. */ | |
1481 | static nios2_insn_relocS * | |
1482 | nios2_insn_reloc_new (bfd_reloc_code_real_type reloc_type, unsigned int pcrel) | |
1483 | { | |
1484 | nios2_insn_relocS *retval; | |
1485 | retval = (nios2_insn_relocS *) malloc (sizeof (nios2_insn_relocS)); | |
1486 | if (retval == NULL) | |
1487 | { | |
1488 | as_bad (_("can't create relocation")); | |
1489 | abort (); | |
1490 | } | |
1491 | ||
1492 | /* Fill out the fields with default values. */ | |
1493 | retval->reloc_next = NULL; | |
1494 | retval->reloc_type = reloc_type; | |
1495 | retval->reloc_pcrel = pcrel; | |
1496 | return retval; | |
1497 | } | |
1498 | ||
1499 | /* Frees up memory previously allocated by nios2_insn_reloc_new(). */ | |
1500 | /* FIXME: this is never called; memory leak? */ | |
1501 | #if 0 | |
1502 | static void | |
1503 | nios2_insn_reloc_destroy (nios2_insn_relocS *reloc) | |
1504 | { | |
1505 | gas_assert (reloc != NULL); | |
1506 | free (reloc); | |
1507 | } | |
1508 | #endif | |
1509 | ||
96ba4233 SL |
1510 | /* Look up a register name and validate it for the given regtype. |
1511 | Return the register mapping or NULL on failure. */ | |
1512 | static struct nios2_reg * | |
1513 | nios2_parse_reg (const char *token, unsigned long regtype) | |
1514 | { | |
1515 | struct nios2_reg *reg = nios2_reg_lookup (token); | |
1516 | ||
1517 | if (reg == NULL) | |
1518 | { | |
1519 | as_bad (_("unknown register %s"), token); | |
1520 | return NULL; | |
1521 | } | |
1522 | ||
1523 | /* Matched a register, but is it the wrong type? */ | |
1524 | if (!(regtype & reg->regtype)) | |
1525 | { | |
1526 | if (regtype & REG_CONTROL) | |
1527 | as_bad (_("expecting control register")); | |
1528 | else if (reg->regtype & REG_CONTROL) | |
1529 | as_bad (_("illegal use of control register")); | |
1530 | else if (reg->regtype & REG_COPROCESSOR) | |
1531 | as_bad (_("illegal use of coprocessor register")); | |
1532 | else | |
1533 | as_bad (_("invalid register %s"), token); | |
1534 | return NULL; | |
1535 | } | |
1536 | ||
1537 | /* Warn for explicit use of special registers. */ | |
1538 | if (reg->regtype & REG_NORMAL) | |
1539 | { | |
1540 | if (!nios2_as_options.noat && reg->index == 1) | |
1541 | as_warn (_("Register at (r1) can sometimes be corrupted by " | |
1542 | "assembler optimizations.\n" | |
1543 | "Use .set noat to turn off those optimizations " | |
1544 | "(and this warning).")); | |
1545 | if (!nios2_as_options.nobreak && reg->index == 25) | |
1546 | as_warn (_("The debugger will corrupt bt (r25).\n" | |
1547 | "If you don't need to debug this " | |
1548 | "code use .set nobreak to turn off this warning.")); | |
1549 | if (!nios2_as_options.nobreak && reg->index == 30) | |
1550 | as_warn (_("The debugger will corrupt sstatus/ba (r30).\n" | |
1551 | "If you don't need to debug this " | |
1552 | "code use .set nobreak to turn off this warning.")); | |
1553 | } | |
1554 | ||
1555 | return reg; | |
1556 | } | |
1557 | ||
c8c8175b SL |
1558 | /* This function parses a reglist for ldwm/stwm and push.n/pop.n |
1559 | instructions, given as a brace-enclosed register list. The tokenizer | |
1560 | has replaced commas in the token with spaces. | |
1561 | The return value is a bitmask of registers in the set. It also | |
1562 | sets nios2_reglist_mask and nios2_reglist_dir to allow error checking | |
1563 | when parsing the base register. */ | |
1564 | ||
1565 | static unsigned long nios2_reglist_mask; | |
1566 | static int nios2_reglist_dir; | |
1567 | ||
1568 | static unsigned long | |
1569 | nios2_parse_reglist (char *token, const struct nios2_opcode *op) | |
1570 | { | |
1571 | unsigned long mask = 0; | |
1572 | int dir = 0; | |
1573 | unsigned long regtype = 0; | |
1574 | int last = -1; | |
1575 | const char *regname; | |
1576 | ||
1577 | nios2_reglist_mask = 0; | |
1578 | nios2_reglist_dir = 0; | |
1579 | ||
1580 | if (op->match == MATCH_R2_LDWM || op->match == MATCH_R2_STWM) | |
1581 | { | |
1582 | regtype = REG_LDWM; | |
1583 | dir = 0; | |
1584 | } | |
1585 | else if (op->match == MATCH_R2_PUSH_N) | |
1586 | { | |
1587 | regtype = REG_POP; | |
1588 | dir = -1; | |
1589 | } | |
1590 | else if (op->match == MATCH_R2_POP_N) | |
1591 | { | |
1592 | regtype = REG_POP; | |
1593 | dir = 1; | |
1594 | } | |
1595 | else | |
1596 | bad_opcode (op); | |
1597 | ||
1598 | for (regname = strtok (token, "{ }"); | |
1599 | regname; | |
1600 | regname = strtok (NULL, "{ }")) | |
1601 | { | |
1602 | int regno; | |
1603 | struct nios2_reg *reg = nios2_parse_reg (regname, regtype); | |
1604 | ||
1605 | if (!reg) | |
1606 | break; | |
1607 | regno = reg->index; | |
1608 | ||
1609 | /* Make sure registers are listed in proper sequence. */ | |
1610 | if (last >= 0) | |
1611 | { | |
1612 | if (regno == last) | |
1613 | { | |
1614 | as_bad ("duplicate register %s\n", reg->name); | |
1615 | return 0; | |
1616 | } | |
1617 | else if (dir == 0) | |
1618 | dir = (regno < last ? -1 : 1); | |
1619 | else if ((dir > 0 && regno < last) | |
1620 | || (dir < 0 && regno > last) | |
1621 | || (op->match == MATCH_R2_PUSH_N | |
1622 | && ! ((last == 31 && regno == 28) | |
1623 | || (last == 31 && regno <= 23) | |
1624 | || (last == 28 && regno <= 23) | |
1625 | || (regno < 23 && regno == last - 1))) | |
1626 | || (op->match == MATCH_R2_POP_N | |
1627 | && ! ((regno == 31 && last == 28) | |
1628 | || (regno == 31 && last <= 23) | |
1629 | || (regno == 28 && last <= 23) | |
1630 | || (last < 23 && last == regno - 1)))) | |
1631 | { | |
1632 | as_bad ("invalid register order"); | |
1633 | return 0; | |
1634 | } | |
1635 | } | |
1636 | ||
1637 | mask |= 1 << regno; | |
1638 | last = regno; | |
1639 | } | |
1640 | ||
1641 | /* Check that all ldwm/stwm regs belong to the same set. */ | |
1642 | if ((op->match == MATCH_R2_LDWM || op->match == MATCH_R2_STWM) | |
1643 | && (mask & 0x00003ffc) && (mask & 0x90ffc000)) | |
1644 | { | |
1645 | as_bad ("invalid register set in reglist"); | |
1646 | return 0; | |
1647 | } | |
1648 | ||
1649 | /* Check that push.n/pop.n regs include RA. */ | |
1650 | if ((op->match == MATCH_R2_PUSH_N || op->match == MATCH_R2_POP_N) | |
1651 | && ((mask & 0x80000000) == 0)) | |
1652 | { | |
1653 | as_bad ("reglist must include ra (r31)"); | |
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | /* Check that there is at least one register in the set. */ | |
1658 | if (!mask) | |
1659 | { | |
1660 | as_bad ("reglist must include at least one register"); | |
1661 | return 0; | |
1662 | } | |
1663 | ||
1664 | /* OK, reglist passed validation. */ | |
1665 | nios2_reglist_mask = mask; | |
1666 | nios2_reglist_dir = dir; | |
1667 | return mask; | |
1668 | } | |
1669 | ||
1670 | /* This function parses the base register and options used by the ldwm/stwm | |
1671 | instructions. Returns the base register and sets the option arguments | |
1672 | accordingly. On failure, returns NULL. */ | |
1673 | static struct nios2_reg * | |
1674 | nios2_parse_base_register (char *str, int *direction, int *writeback, int *ret) | |
1675 | { | |
1676 | char *regname; | |
1677 | struct nios2_reg *reg; | |
1678 | ||
1679 | *direction = 0; | |
1680 | *writeback = 0; | |
1681 | *ret = 0; | |
1682 | ||
1683 | /* Check for --. */ | |
1684 | if (strncmp (str, "--", 2) == 0) | |
1685 | { | |
1686 | str += 2; | |
1687 | *direction -= 1; | |
1688 | } | |
1689 | ||
1690 | /* Extract the base register. */ | |
1691 | if (*str != '(') | |
1692 | { | |
1693 | as_bad ("expected '(' before base register"); | |
1694 | return NULL; | |
1695 | } | |
1696 | str++; | |
1697 | regname = str; | |
1698 | str = strchr (str, ')'); | |
1699 | if (!str) | |
1700 | { | |
1701 | as_bad ("expected ')' after base register"); | |
1702 | return NULL; | |
1703 | } | |
1704 | *str = '\0'; | |
1705 | str++; | |
1706 | reg = nios2_parse_reg (regname, REG_NORMAL); | |
1707 | if (reg == NULL) | |
1708 | return NULL; | |
1709 | ||
1710 | /* Check for ++. */ | |
1711 | if (strncmp (str, "++", 2) == 0) | |
1712 | { | |
1713 | str += 2; | |
1714 | *direction += 1; | |
1715 | } | |
1716 | ||
1717 | /* Ensure that either -- or ++ is specified, but not both. */ | |
1718 | if (*direction == 0) | |
1719 | { | |
1720 | as_bad ("invalid base register syntax"); | |
1721 | return NULL;; | |
1722 | } | |
1723 | ||
1724 | /* Check for options. The tokenizer has replaced commas with spaces. */ | |
1725 | while (*str) | |
1726 | { | |
1727 | while (*str == ' ') | |
1728 | str++; | |
1729 | if (strncmp (str, "writeback", 9) == 0) | |
1730 | { | |
1731 | *writeback = 1; | |
1732 | str += 9; | |
1733 | } | |
1734 | else if (strncmp (str, "ret", 3) == 0) | |
1735 | { | |
1736 | *ret = 1; | |
1737 | str += 3; | |
1738 | } | |
1739 | else if (*str) | |
1740 | { | |
1741 | as_bad ("invalid option syntax"); | |
1742 | return NULL; | |
1743 | } | |
1744 | } | |
1745 | ||
1746 | return reg; | |
1747 | } | |
1748 | ||
1749 | ||
36591ba1 SL |
1750 | /* The various nios2_assemble_* functions call this |
1751 | function to generate an expression from a string representing an expression. | |
1752 | It then tries to evaluate the expression, and if it can, returns its value. | |
3739860c | 1753 | If not, it creates a new nios2_insn_relocS and stores the expression and |
36591ba1 SL |
1754 | reloc_type for future use. */ |
1755 | static unsigned long | |
1756 | nios2_assemble_expression (const char *exprstr, | |
1757 | nios2_insn_infoS *insn, | |
c8c8175b | 1758 | bfd_reloc_code_real_type orig_reloc_type, |
36591ba1 SL |
1759 | unsigned int pcrel) |
1760 | { | |
1761 | nios2_insn_relocS *reloc; | |
1762 | char *saved_line_ptr; | |
c8c8175b | 1763 | unsigned long value = 0; |
36591ba1 | 1764 | int i; |
c8c8175b | 1765 | bfd_reloc_code_real_type reloc_type = orig_reloc_type; |
36591ba1 SL |
1766 | |
1767 | gas_assert (exprstr != NULL); | |
1768 | gas_assert (insn != NULL); | |
1769 | ||
1770 | /* Check for relocation operators. | |
1771 | Change the relocation type and advance the ptr to the start of | |
1772 | the expression proper. */ | |
1773 | for (i = 0; i < nios2_num_special_relocs; i++) | |
1774 | if (strstr (exprstr, nios2_special_reloc[i].string) != NULL) | |
1775 | { | |
1776 | reloc_type = nios2_special_reloc[i].reloc_type; | |
1777 | exprstr += strlen (nios2_special_reloc[i].string) + 1; | |
3739860c | 1778 | |
36591ba1 SL |
1779 | /* %lo and %hiadj have different meanings for PC-relative |
1780 | expressions. */ | |
1781 | if (pcrel) | |
1782 | { | |
1783 | if (reloc_type == BFD_RELOC_NIOS2_LO16) | |
1784 | reloc_type = BFD_RELOC_NIOS2_PCREL_LO; | |
1785 | if (reloc_type == BFD_RELOC_NIOS2_HIADJ16) | |
1786 | reloc_type = BFD_RELOC_NIOS2_PCREL_HA; | |
1787 | } | |
3739860c | 1788 | |
36591ba1 SL |
1789 | break; |
1790 | } | |
1791 | ||
c8c8175b SL |
1792 | /* No relocation allowed; we must have a constant expression. */ |
1793 | if (orig_reloc_type == BFD_RELOC_NONE) | |
1794 | { | |
1795 | expressionS exp; | |
1796 | ||
1797 | /* Parse the expression string. */ | |
1798 | saved_line_ptr = input_line_pointer; | |
1799 | input_line_pointer = (char *) exprstr; | |
1800 | expression (&exp); | |
1801 | input_line_pointer = saved_line_ptr; | |
1802 | ||
1803 | /* If we don't have a constant, give an error. */ | |
1804 | if (reloc_type != orig_reloc_type || exp.X_op != O_constant) | |
1805 | as_bad (_("expression must be constant")); | |
1806 | else | |
1807 | value = exp.X_add_number; | |
1808 | return (unsigned long) value; | |
1809 | } | |
1810 | ||
36591ba1 SL |
1811 | /* We potentially have a relocation. */ |
1812 | reloc = nios2_insn_reloc_new (reloc_type, pcrel); | |
96ba4233 SL |
1813 | reloc->reloc_next = insn->insn_reloc; |
1814 | insn->insn_reloc = reloc; | |
36591ba1 SL |
1815 | |
1816 | /* Parse the expression string. */ | |
1817 | saved_line_ptr = input_line_pointer; | |
1818 | input_line_pointer = (char *) exprstr; | |
1819 | expression (&reloc->reloc_expression); | |
1820 | input_line_pointer = saved_line_ptr; | |
1821 | ||
1822 | /* This is redundant as the fixup will put this into | |
1823 | the instruction, but it is included here so that | |
1824 | self-test mode (-r) works. */ | |
36591ba1 SL |
1825 | if (nios2_mode == NIOS2_MODE_TEST |
1826 | && reloc->reloc_expression.X_op == O_constant) | |
1827 | value = reloc->reloc_expression.X_add_number; | |
1828 | ||
1829 | return (unsigned long) value; | |
1830 | } | |
1831 | ||
c8c8175b SL |
1832 | /* Encode a 3-bit register number, giving an error if this is not possible. */ |
1833 | static unsigned int | |
1834 | nios2_assemble_reg3 (const char *token) | |
1835 | { | |
1836 | struct nios2_reg *reg = nios2_parse_reg (token, REG_3BIT); | |
1837 | int j; | |
1838 | ||
1839 | if (reg == NULL) | |
1840 | return 0; | |
1841 | ||
1842 | for (j = 0; j < nios2_num_r2_reg3_mappings; j++) | |
1843 | if (nios2_r2_reg3_mappings[j] == reg->index) | |
1844 | return j; | |
1845 | ||
1846 | /* Should never get here if we passed validation. */ | |
1847 | as_bad (_("invalid register %s"), token); | |
1848 | return 0; | |
1849 | } | |
36591ba1 | 1850 | |
96ba4233 | 1851 | /* Argument assemble functions. */ |
c8c8175b SL |
1852 | |
1853 | ||
1854 | /* Control register index. */ | |
3739860c | 1855 | static void |
96ba4233 | 1856 | nios2_assemble_arg_c (const char *token, nios2_insn_infoS *insn) |
36591ba1 | 1857 | { |
96ba4233 SL |
1858 | struct nios2_reg *reg = nios2_parse_reg (token, REG_CONTROL); |
1859 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
36591ba1 | 1860 | |
96ba4233 SL |
1861 | if (reg == NULL) |
1862 | return; | |
36591ba1 | 1863 | |
96ba4233 SL |
1864 | switch (op->format) |
1865 | { | |
1866 | case iw_r_type: | |
1867 | insn->insn_code |= SET_IW_R_IMM5 (reg->index); | |
1868 | break; | |
c8c8175b SL |
1869 | case iw_F3X6L5_type: |
1870 | insn->insn_code |= SET_IW_F3X6L5_IMM5 (reg->index); | |
1871 | break; | |
96ba4233 SL |
1872 | default: |
1873 | bad_opcode (op); | |
36591ba1 SL |
1874 | } |
1875 | } | |
1876 | ||
c8c8175b | 1877 | /* Destination register. */ |
3739860c | 1878 | static void |
96ba4233 | 1879 | nios2_assemble_arg_d (const char *token, nios2_insn_infoS *insn) |
36591ba1 | 1880 | { |
96ba4233 SL |
1881 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1882 | unsigned long regtype = REG_NORMAL; | |
1883 | struct nios2_reg *reg; | |
36591ba1 | 1884 | |
c8c8175b | 1885 | if (op->format == iw_custom_type || op->format == iw_F3X8_type) |
96ba4233 SL |
1886 | regtype |= REG_COPROCESSOR; |
1887 | reg = nios2_parse_reg (token, regtype); | |
1888 | if (reg == NULL) | |
1889 | return; | |
36591ba1 | 1890 | |
96ba4233 | 1891 | switch (op->format) |
36591ba1 | 1892 | { |
96ba4233 SL |
1893 | case iw_r_type: |
1894 | insn->insn_code |= SET_IW_R_C (reg->index); | |
1895 | break; | |
1896 | case iw_custom_type: | |
1897 | insn->insn_code |= SET_IW_CUSTOM_C (reg->index); | |
1898 | if (reg->regtype & REG_COPROCESSOR) | |
1899 | insn->insn_code |= SET_IW_CUSTOM_READC (0); | |
36591ba1 | 1900 | else |
96ba4233 SL |
1901 | insn->insn_code |= SET_IW_CUSTOM_READC (1); |
1902 | break; | |
c8c8175b SL |
1903 | case iw_F3X6L5_type: |
1904 | case iw_F3X6_type: | |
1905 | insn->insn_code |= SET_IW_F3X6L5_C (reg->index); | |
1906 | break; | |
1907 | case iw_F3X8_type: | |
1908 | insn->insn_code |= SET_IW_F3X8_C (reg->index); | |
1909 | if (reg->regtype & REG_COPROCESSOR) | |
1910 | insn->insn_code |= SET_IW_F3X8_READC (0); | |
1911 | else | |
1912 | insn->insn_code |= SET_IW_F3X8_READC (1); | |
1913 | break; | |
1914 | case iw_F2_type: | |
1915 | insn->insn_code |= SET_IW_F2_B (reg->index); | |
1916 | break; | |
96ba4233 SL |
1917 | default: |
1918 | bad_opcode (op); | |
36591ba1 SL |
1919 | } |
1920 | } | |
1921 | ||
c8c8175b | 1922 | /* Source register 1. */ |
3739860c | 1923 | static void |
96ba4233 | 1924 | nios2_assemble_arg_s (const char *token, nios2_insn_infoS *insn) |
36591ba1 | 1925 | { |
96ba4233 SL |
1926 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
1927 | unsigned long regtype = REG_NORMAL; | |
1928 | struct nios2_reg *reg; | |
36591ba1 | 1929 | |
c8c8175b | 1930 | if (op->format == iw_custom_type || op->format == iw_F3X8_type) |
96ba4233 SL |
1931 | regtype |= REG_COPROCESSOR; |
1932 | reg = nios2_parse_reg (token, regtype); | |
1933 | if (reg == NULL) | |
1934 | return; | |
36591ba1 | 1935 | |
96ba4233 | 1936 | switch (op->format) |
36591ba1 | 1937 | { |
96ba4233 | 1938 | case iw_r_type: |
c8c8175b SL |
1939 | if (op->match == MATCH_R1_JMP && reg->index == 31) |
1940 | as_bad (_("r31 cannot be used with jmp; use ret instead")); | |
96ba4233 SL |
1941 | insn->insn_code |= SET_IW_R_A (reg->index); |
1942 | break; | |
1943 | case iw_i_type: | |
1944 | insn->insn_code |= SET_IW_I_A (reg->index); | |
1945 | break; | |
1946 | case iw_custom_type: | |
1947 | insn->insn_code |= SET_IW_CUSTOM_A (reg->index); | |
1948 | if (reg->regtype & REG_COPROCESSOR) | |
1949 | insn->insn_code |= SET_IW_CUSTOM_READA (0); | |
1950 | else | |
1951 | insn->insn_code |= SET_IW_CUSTOM_READA (1); | |
1952 | break; | |
c8c8175b SL |
1953 | case iw_F2I16_type: |
1954 | insn->insn_code |= SET_IW_F2I16_A (reg->index); | |
1955 | break; | |
1956 | case iw_F2X4I12_type: | |
1957 | insn->insn_code |= SET_IW_F2X4I12_A (reg->index); | |
1958 | break; | |
1959 | case iw_F1X4I12_type: | |
1960 | insn->insn_code |= SET_IW_F1X4I12_A (reg->index); | |
1961 | break; | |
1962 | case iw_F1X4L17_type: | |
1963 | insn->insn_code |= SET_IW_F1X4L17_A (reg->index); | |
1964 | break; | |
1965 | case iw_F3X6L5_type: | |
1966 | case iw_F3X6_type: | |
1967 | if (op->match == MATCH_R2_JMP && reg->index == 31) | |
1968 | as_bad (_("r31 cannot be used with jmp; use ret instead")); | |
1969 | insn->insn_code |= SET_IW_F3X6L5_A (reg->index); | |
1970 | break; | |
1971 | case iw_F2X6L10_type: | |
1972 | insn->insn_code |= SET_IW_F2X6L10_A (reg->index); | |
1973 | break; | |
1974 | case iw_F3X8_type: | |
1975 | insn->insn_code |= SET_IW_F3X8_A (reg->index); | |
1976 | if (reg->regtype & REG_COPROCESSOR) | |
1977 | insn->insn_code |= SET_IW_F3X8_READA (0); | |
1978 | else | |
1979 | insn->insn_code |= SET_IW_F3X8_READA (1); | |
1980 | break; | |
1981 | case iw_F1X1_type: | |
1982 | if (op->match == MATCH_R2_JMPR_N && reg->index == 31) | |
1983 | as_bad (_("r31 cannot be used with jmpr.n; use ret.n instead")); | |
1984 | insn->insn_code |= SET_IW_F1X1_A (reg->index); | |
1985 | break; | |
1986 | case iw_F1I5_type: | |
1987 | /* Implicit stack pointer reference. */ | |
1988 | if (reg->index != 27) | |
1989 | as_bad (_("invalid register %s"), token); | |
1990 | break; | |
1991 | case iw_F2_type: | |
1992 | insn->insn_code |= SET_IW_F2_A (reg->index); | |
1993 | break; | |
96ba4233 SL |
1994 | default: |
1995 | bad_opcode (op); | |
36591ba1 SL |
1996 | } |
1997 | } | |
1998 | ||
c8c8175b | 1999 | /* Source register 2. */ |
3739860c | 2000 | static void |
96ba4233 | 2001 | nios2_assemble_arg_t (const char *token, nios2_insn_infoS *insn) |
36591ba1 | 2002 | { |
96ba4233 SL |
2003 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
2004 | unsigned long regtype = REG_NORMAL; | |
2005 | struct nios2_reg *reg; | |
36591ba1 | 2006 | |
c8c8175b | 2007 | if (op->format == iw_custom_type || op->format == iw_F3X8_type) |
96ba4233 SL |
2008 | regtype |= REG_COPROCESSOR; |
2009 | reg = nios2_parse_reg (token, regtype); | |
2010 | if (reg == NULL) | |
2011 | return; | |
36591ba1 | 2012 | |
96ba4233 SL |
2013 | switch (op->format) |
2014 | { | |
2015 | case iw_r_type: | |
2016 | insn->insn_code |= SET_IW_R_B (reg->index); | |
2017 | break; | |
2018 | case iw_i_type: | |
2019 | insn->insn_code |= SET_IW_I_B (reg->index); | |
2020 | break; | |
2021 | case iw_custom_type: | |
2022 | insn->insn_code |= SET_IW_CUSTOM_B (reg->index); | |
2023 | if (reg->regtype & REG_COPROCESSOR) | |
2024 | insn->insn_code |= SET_IW_CUSTOM_READB (0); | |
36591ba1 | 2025 | else |
96ba4233 SL |
2026 | insn->insn_code |= SET_IW_CUSTOM_READB (1); |
2027 | break; | |
c8c8175b SL |
2028 | case iw_F2I16_type: |
2029 | insn->insn_code |= SET_IW_F2I16_B (reg->index); | |
2030 | break; | |
2031 | case iw_F2X4I12_type: | |
2032 | insn->insn_code |= SET_IW_F2X4I12_B (reg->index); | |
2033 | break; | |
2034 | case iw_F3X6L5_type: | |
2035 | case iw_F3X6_type: | |
2036 | insn->insn_code |= SET_IW_F3X6L5_B (reg->index); | |
2037 | break; | |
2038 | case iw_F2X6L10_type: | |
2039 | insn->insn_code |= SET_IW_F2X6L10_B (reg->index); | |
2040 | break; | |
2041 | case iw_F3X8_type: | |
2042 | insn->insn_code |= SET_IW_F3X8_B (reg->index); | |
2043 | if (reg->regtype & REG_COPROCESSOR) | |
2044 | insn->insn_code |= SET_IW_F3X8_READB (0); | |
2045 | else | |
2046 | insn->insn_code |= SET_IW_F3X8_READB (1); | |
2047 | break; | |
2048 | case iw_F1I5_type: | |
2049 | insn->insn_code |= SET_IW_F1I5_B (reg->index); | |
2050 | break; | |
2051 | case iw_F2_type: | |
2052 | insn->insn_code |= SET_IW_F2_B (reg->index); | |
2053 | break; | |
2054 | case iw_T1X1I6_type: | |
2055 | /* Implicit zero register reference. */ | |
2056 | if (reg->index != 0) | |
2057 | as_bad (_("invalid register %s"), token); | |
2058 | break; | |
2059 | ||
96ba4233 SL |
2060 | default: |
2061 | bad_opcode (op); | |
36591ba1 SL |
2062 | } |
2063 | } | |
2064 | ||
c8c8175b | 2065 | /* Destination register w/3-bit encoding. */ |
3739860c | 2066 | static void |
c8c8175b | 2067 | nios2_assemble_arg_D (const char *token, nios2_insn_infoS *insn) |
36591ba1 | 2068 | { |
96ba4233 | 2069 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
c8c8175b | 2070 | int reg = nios2_assemble_reg3 (token); |
3739860c | 2071 | |
96ba4233 | 2072 | switch (op->format) |
36591ba1 | 2073 | { |
c8c8175b SL |
2074 | case iw_T1I7_type: |
2075 | insn->insn_code |= SET_IW_T1I7_A3 (reg); | |
2076 | break; | |
2077 | case iw_T2X1L3_type: | |
2078 | insn->insn_code |= SET_IW_T2X1L3_B3 (reg); | |
2079 | break; | |
2080 | case iw_T2X1I3_type: | |
2081 | insn->insn_code |= SET_IW_T2X1I3_B3 (reg); | |
2082 | break; | |
2083 | case iw_T3X1_type: | |
2084 | insn->insn_code |= SET_IW_T3X1_C3 (reg); | |
2085 | break; | |
2086 | case iw_T2X3_type: | |
2087 | /* Some instructions using this encoding take 3 register arguments, | |
2088 | requiring the destination register to be the same as the first | |
2089 | source register. */ | |
2090 | if (op->num_args == 3) | |
2091 | insn->insn_code |= SET_IW_T2X3_A3 (reg); | |
2092 | else | |
2093 | insn->insn_code |= SET_IW_T2X3_B3 (reg); | |
96ba4233 SL |
2094 | break; |
2095 | default: | |
2096 | bad_opcode (op); | |
36591ba1 SL |
2097 | } |
2098 | } | |
2099 | ||
c8c8175b | 2100 | /* Source register w/3-bit encoding. */ |
3739860c | 2101 | static void |
c8c8175b | 2102 | nios2_assemble_arg_S (const char *token, nios2_insn_infoS *insn) |
36591ba1 | 2103 | { |
96ba4233 | 2104 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
c8c8175b | 2105 | int reg = nios2_assemble_reg3 (token); |
3739860c | 2106 | |
96ba4233 | 2107 | switch (op->format) |
36591ba1 | 2108 | { |
c8c8175b SL |
2109 | case iw_T1I7_type: |
2110 | insn->insn_code |= SET_IW_T1I7_A3 (reg); | |
2111 | break; | |
2112 | case iw_T2I4_type: | |
2113 | insn->insn_code |= SET_IW_T2I4_A3 (reg); | |
2114 | break; | |
2115 | case iw_T2X1L3_type: | |
2116 | insn->insn_code |= SET_IW_T2X1L3_A3 (reg); | |
2117 | break; | |
2118 | case iw_T2X1I3_type: | |
2119 | insn->insn_code |= SET_IW_T2X1I3_A3 (reg); | |
2120 | break; | |
2121 | case iw_T3X1_type: | |
2122 | insn->insn_code |= SET_IW_T3X1_A3 (reg); | |
2123 | break; | |
2124 | case iw_T2X3_type: | |
2125 | /* Some instructions using this encoding take 3 register arguments, | |
2126 | requiring the destination register to be the same as the first | |
2127 | source register. */ | |
2128 | if (op->num_args == 3) | |
2129 | { | |
2130 | int dreg = GET_IW_T2X3_A3 (insn->insn_code); | |
2131 | if (dreg != reg) | |
2132 | as_bad ("source and destination registers must be the same"); | |
2133 | } | |
2134 | else | |
2135 | insn->insn_code |= SET_IW_T2X3_A3 (reg); | |
2136 | break; | |
2137 | case iw_T1X1I6_type: | |
2138 | insn->insn_code |= SET_IW_T1X1I6_A3 (reg); | |
96ba4233 SL |
2139 | break; |
2140 | default: | |
2141 | bad_opcode (op); | |
36591ba1 SL |
2142 | } |
2143 | } | |
2144 | ||
c8c8175b | 2145 | /* Source register 2 w/3-bit encoding. */ |
3739860c | 2146 | static void |
c8c8175b | 2147 | nios2_assemble_arg_T (const char *token, nios2_insn_infoS *insn) |
36591ba1 | 2148 | { |
96ba4233 | 2149 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
c8c8175b | 2150 | int reg = nios2_assemble_reg3 (token); |
3739860c | 2151 | |
96ba4233 SL |
2152 | switch (op->format) |
2153 | { | |
c8c8175b SL |
2154 | case iw_T2I4_type: |
2155 | insn->insn_code |= SET_IW_T2I4_B3 (reg); | |
2156 | break; | |
2157 | case iw_T3X1_type: | |
2158 | insn->insn_code |= SET_IW_T3X1_B3 (reg); | |
2159 | break; | |
2160 | case iw_T2X3_type: | |
2161 | insn->insn_code |= SET_IW_T2X3_B3 (reg); | |
96ba4233 SL |
2162 | break; |
2163 | default: | |
2164 | bad_opcode (op); | |
36591ba1 SL |
2165 | } |
2166 | } | |
2167 | ||
c8c8175b | 2168 | /* 16-bit signed immediate. */ |
3739860c | 2169 | static void |
c8c8175b | 2170 | nios2_assemble_arg_i (const char *token, nios2_insn_infoS *insn) |
dad60f8e | 2171 | { |
96ba4233 SL |
2172 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
2173 | unsigned int val; | |
dad60f8e | 2174 | |
96ba4233 SL |
2175 | switch (op->format) |
2176 | { | |
c8c8175b | 2177 | case iw_i_type: |
96ba4233 | 2178 | val = nios2_assemble_expression (token, insn, |
c8c8175b SL |
2179 | BFD_RELOC_NIOS2_S16, 0); |
2180 | insn->constant_bits |= SET_IW_I_IMM16 (val); | |
2181 | break; | |
2182 | case iw_F2I16_type: | |
2183 | val = nios2_assemble_expression (token, insn, | |
2184 | BFD_RELOC_NIOS2_S16, 0); | |
2185 | insn->constant_bits |= SET_IW_F2I16_IMM16 (val); | |
96ba4233 SL |
2186 | break; |
2187 | default: | |
2188 | bad_opcode (op); | |
dad60f8e SL |
2189 | } |
2190 | } | |
2191 | ||
c8c8175b | 2192 | /* 12-bit signed immediate. */ |
3739860c | 2193 | static void |
c8c8175b | 2194 | nios2_assemble_arg_I (const char *token, nios2_insn_infoS *insn) |
36591ba1 | 2195 | { |
96ba4233 SL |
2196 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
2197 | unsigned int val; | |
36591ba1 | 2198 | |
96ba4233 SL |
2199 | switch (op->format) |
2200 | { | |
c8c8175b | 2201 | case iw_F2X4I12_type: |
96ba4233 | 2202 | val = nios2_assemble_expression (token, insn, |
c8c8175b SL |
2203 | BFD_RELOC_NIOS2_R2_S12, 0); |
2204 | insn->constant_bits |= SET_IW_F2X4I12_IMM12 (val); | |
2205 | break; | |
2206 | case iw_F1X4I12_type: | |
2207 | val = nios2_assemble_expression (token, insn, | |
2208 | BFD_RELOC_NIOS2_R2_S12, 0); | |
2209 | insn->constant_bits |= SET_IW_F2X4I12_IMM12 (val); | |
96ba4233 SL |
2210 | break; |
2211 | default: | |
2212 | bad_opcode (op); | |
36591ba1 SL |
2213 | } |
2214 | } | |
2215 | ||
c8c8175b | 2216 | /* 16-bit unsigned immediate. */ |
3739860c | 2217 | static void |
c8c8175b | 2218 | nios2_assemble_arg_u (const char *token, nios2_insn_infoS *insn) |
36591ba1 | 2219 | { |
96ba4233 SL |
2220 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
2221 | unsigned int val; | |
36591ba1 | 2222 | |
96ba4233 | 2223 | switch (op->format) |
36591ba1 | 2224 | { |
c8c8175b SL |
2225 | case iw_i_type: |
2226 | val = nios2_assemble_expression (token, insn, | |
2227 | BFD_RELOC_NIOS2_U16, 0); | |
2228 | insn->constant_bits |= SET_IW_I_IMM16 (val); | |
2229 | break; | |
2230 | case iw_F2I16_type: | |
2231 | val = nios2_assemble_expression (token, insn, | |
2232 | BFD_RELOC_NIOS2_U16, 0); | |
2233 | insn->constant_bits |= SET_IW_F2I16_IMM16 (val); | |
2234 | break; | |
2235 | default: | |
2236 | bad_opcode (op); | |
2237 | } | |
2238 | } | |
2239 | ||
2240 | /* 7-bit unsigned immediate with 2-bit shift. */ | |
3739860c | 2241 | static void |
c8c8175b SL |
2242 | nios2_assemble_arg_U (const char *token, nios2_insn_infoS *insn) |
2243 | { | |
2244 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2245 | unsigned int val; | |
2246 | ||
2247 | switch (op->format) | |
2248 | { | |
2249 | case iw_T1I7_type: | |
2250 | val = nios2_assemble_expression (token, insn, | |
2251 | BFD_RELOC_NIOS2_R2_T1I7_2, 0); | |
2252 | insn->constant_bits |= SET_IW_T1I7_IMM7 (val >> 2); | |
2253 | break; | |
2254 | case iw_X1I7_type: | |
2255 | val = nios2_assemble_expression (token, insn, | |
2256 | BFD_RELOC_NIOS2_R2_X1I7_2, 0); | |
2257 | insn->constant_bits |= SET_IW_X1I7_IMM7 (val >> 2); | |
2258 | break; | |
2259 | default: | |
2260 | bad_opcode (op); | |
2261 | } | |
2262 | } | |
2263 | ||
2264 | /* 5-bit unsigned immediate with 2-bit shift. */ | |
3739860c | 2265 | static void |
c8c8175b SL |
2266 | nios2_assemble_arg_V (const char *token, nios2_insn_infoS *insn) |
2267 | { | |
2268 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2269 | unsigned int val; | |
2270 | ||
2271 | switch (op->format) | |
2272 | { | |
2273 | case iw_F1I5_type: | |
2274 | val = nios2_assemble_expression (token, insn, | |
2275 | BFD_RELOC_NIOS2_R2_F1I5_2, 0); | |
2276 | insn->constant_bits |= SET_IW_F1I5_IMM5 (val >> 2); | |
2277 | break; | |
2278 | default: | |
2279 | bad_opcode (op); | |
2280 | } | |
2281 | } | |
2282 | ||
2283 | /* 4-bit unsigned immediate with 2-bit shift. */ | |
3739860c | 2284 | static void |
c8c8175b SL |
2285 | nios2_assemble_arg_W (const char *token, nios2_insn_infoS *insn) |
2286 | { | |
2287 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2288 | unsigned int val; | |
2289 | ||
2290 | switch (op->format) | |
2291 | { | |
2292 | case iw_T2I4_type: | |
2293 | val = nios2_assemble_expression (token, insn, | |
2294 | BFD_RELOC_NIOS2_R2_T2I4_2, 0); | |
2295 | insn->constant_bits |= SET_IW_T2I4_IMM4 (val >> 2); | |
2296 | break; | |
2297 | case iw_L5I4X1_type: | |
3739860c | 2298 | /* This argument is optional for push.n/pop.n, and defaults to |
c8c8175b SL |
2299 | zero if unspecified. */ |
2300 | if (token == NULL) | |
2301 | return; | |
2302 | ||
2303 | val = nios2_assemble_expression (token, insn, | |
2304 | BFD_RELOC_NIOS2_R2_L5I4X1, 0); | |
2305 | insn->constant_bits |= SET_IW_L5I4X1_IMM4 (val >> 2); | |
2306 | break; | |
2307 | default: | |
2308 | bad_opcode (op); | |
2309 | } | |
2310 | } | |
2311 | ||
2312 | /* 4-bit unsigned immediate with 1-bit shift. */ | |
3739860c | 2313 | static void |
c8c8175b SL |
2314 | nios2_assemble_arg_X (const char *token, nios2_insn_infoS *insn) |
2315 | { | |
2316 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2317 | unsigned int val; | |
2318 | ||
2319 | switch (op->format) | |
2320 | { | |
2321 | case iw_T2I4_type: | |
2322 | val = nios2_assemble_expression (token, insn, | |
2323 | BFD_RELOC_NIOS2_R2_T2I4_1, 0); | |
2324 | insn->constant_bits |= SET_IW_T2I4_IMM4 (val >> 1); | |
2325 | break; | |
2326 | default: | |
2327 | bad_opcode (op); | |
2328 | } | |
2329 | } | |
2330 | ||
2331 | /* 4-bit unsigned immediate without shift. */ | |
3739860c | 2332 | static void |
c8c8175b SL |
2333 | nios2_assemble_arg_Y (const char *token, nios2_insn_infoS *insn) |
2334 | { | |
2335 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2336 | unsigned int val; | |
2337 | ||
2338 | switch (op->format) | |
2339 | { | |
2340 | case iw_T2I4_type: | |
2341 | val = nios2_assemble_expression (token, insn, | |
2342 | BFD_RELOC_NIOS2_R2_T2I4, 0); | |
2343 | insn->constant_bits |= SET_IW_T2I4_IMM4 (val); | |
2344 | break; | |
2345 | default: | |
2346 | bad_opcode (op); | |
2347 | } | |
2348 | } | |
2349 | ||
2350 | ||
2351 | /* 16-bit signed immediate address offset. */ | |
3739860c | 2352 | static void |
c8c8175b SL |
2353 | nios2_assemble_arg_o (const char *token, nios2_insn_infoS *insn) |
2354 | { | |
2355 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2356 | unsigned int val; | |
2357 | ||
2358 | switch (op->format) | |
2359 | { | |
2360 | case iw_i_type: | |
2361 | val = nios2_assemble_expression (token, insn, | |
2362 | BFD_RELOC_16_PCREL, 1); | |
2363 | insn->constant_bits |= SET_IW_I_IMM16 (val); | |
2364 | break; | |
2365 | case iw_F2I16_type: | |
2366 | val = nios2_assemble_expression (token, insn, | |
2367 | BFD_RELOC_16_PCREL, 1); | |
2368 | insn->constant_bits |= SET_IW_F2I16_IMM16 (val); | |
2369 | break; | |
2370 | default: | |
2371 | bad_opcode (op); | |
2372 | } | |
2373 | } | |
2374 | ||
2375 | /* 10-bit signed address offset with 1-bit shift. */ | |
3739860c | 2376 | static void |
c8c8175b SL |
2377 | nios2_assemble_arg_O (const char *token, nios2_insn_infoS *insn) |
2378 | { | |
2379 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2380 | unsigned int val; | |
2381 | ||
2382 | switch (op->format) | |
2383 | { | |
2384 | case iw_I10_type: | |
2385 | val = nios2_assemble_expression (token, insn, | |
2386 | BFD_RELOC_NIOS2_R2_I10_1_PCREL, 1); | |
2387 | insn->constant_bits |= SET_IW_I10_IMM10 (val >> 1); | |
2388 | break; | |
2389 | default: | |
2390 | bad_opcode (op); | |
2391 | } | |
2392 | } | |
2393 | ||
2394 | /* 7-bit signed address offset with 1-bit shift. */ | |
3739860c | 2395 | static void |
c8c8175b SL |
2396 | nios2_assemble_arg_P (const char *token, nios2_insn_infoS *insn) |
2397 | { | |
2398 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2399 | unsigned int val; | |
2400 | ||
2401 | switch (op->format) | |
2402 | { | |
2403 | case iw_T1I7_type: | |
2404 | val = nios2_assemble_expression (token, insn, | |
2405 | BFD_RELOC_NIOS2_R2_T1I7_1_PCREL, 1); | |
2406 | insn->constant_bits |= SET_IW_T1I7_IMM7 (val >> 1); | |
2407 | break; | |
2408 | default: | |
2409 | bad_opcode (op); | |
2410 | } | |
2411 | } | |
2412 | ||
2413 | /* 5-bit unsigned immediate. */ | |
3739860c | 2414 | static void |
c8c8175b SL |
2415 | nios2_assemble_arg_j (const char *token, nios2_insn_infoS *insn) |
2416 | { | |
2417 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2418 | unsigned int val; | |
2419 | ||
2420 | switch (op->format) | |
2421 | { | |
2422 | case iw_r_type: | |
2423 | val = nios2_assemble_expression (token, insn, | |
2424 | BFD_RELOC_NIOS2_IMM5, 0); | |
2425 | insn->constant_bits |= SET_IW_R_IMM5 (val); | |
2426 | break; | |
2427 | case iw_F3X6L5_type: | |
2428 | if (op->match == MATCH_R2_ENI) | |
2429 | /* Value must be constant 0 or 1. */ | |
2430 | { | |
2431 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); | |
2432 | if (val != 0 && val != 1) | |
2433 | as_bad ("invalid eni argument %u", val); | |
2434 | insn->insn_code |= SET_IW_F3X6L5_IMM5 (val); | |
2435 | } | |
2436 | else | |
2437 | { | |
2438 | val = nios2_assemble_expression (token, insn, | |
2439 | BFD_RELOC_NIOS2_IMM5, 0); | |
2440 | insn->constant_bits |= SET_IW_F3X6L5_IMM5 (val); | |
2441 | } | |
2442 | break; | |
2443 | case iw_F2X6L10_type: | |
2444 | /* Only constant expression without relocation permitted for | |
2445 | bit position. */ | |
2446 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); | |
2447 | if (val > 31) | |
2448 | as_bad ("invalid bit position %u", val); | |
2449 | insn->insn_code |= SET_IW_F2X6L10_MSB (val); | |
2450 | break; | |
2451 | case iw_X2L5_type: | |
2452 | val = nios2_assemble_expression (token, insn, | |
2453 | BFD_RELOC_NIOS2_R2_X2L5, 0); | |
2454 | insn->constant_bits |= SET_IW_X2L5_IMM5 (val); | |
2455 | break; | |
2456 | default: | |
2457 | bad_opcode (op); | |
2458 | } | |
2459 | } | |
2460 | ||
2461 | /* Second 5-bit unsigned immediate field. */ | |
3739860c | 2462 | static void |
c8c8175b SL |
2463 | nios2_assemble_arg_k (const char *token, nios2_insn_infoS *insn) |
2464 | { | |
2465 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2466 | unsigned int val; | |
2467 | ||
2468 | switch (op->format) | |
2469 | { | |
2470 | case iw_F2X6L10_type: | |
2471 | /* Only constant expression without relocation permitted for | |
2472 | bit position. */ | |
2473 | val = nios2_assemble_expression (token, insn, | |
2474 | BFD_RELOC_NONE, 0); | |
2475 | if (val > 31) | |
2476 | as_bad ("invalid bit position %u", val); | |
2477 | else if (GET_IW_F2X6L10_MSB (insn->insn_code) < val) | |
2478 | as_bad ("MSB must be greater than or equal to LSB"); | |
2479 | insn->insn_code |= SET_IW_F2X6L10_LSB (val); | |
2480 | break; | |
2481 | default: | |
2482 | bad_opcode (op); | |
2483 | } | |
2484 | } | |
2485 | ||
2486 | /* 8-bit unsigned immediate. */ | |
3739860c | 2487 | static void |
c8c8175b SL |
2488 | nios2_assemble_arg_l (const char *token, nios2_insn_infoS *insn) |
2489 | { | |
2490 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2491 | unsigned int val; | |
2492 | ||
2493 | switch (op->format) | |
2494 | { | |
2495 | case iw_custom_type: | |
2496 | val = nios2_assemble_expression (token, insn, | |
2497 | BFD_RELOC_NIOS2_IMM8, 0); | |
2498 | insn->constant_bits |= SET_IW_CUSTOM_N (val); | |
2499 | break; | |
2500 | case iw_F3X8_type: | |
2501 | val = nios2_assemble_expression (token, insn, | |
2502 | BFD_RELOC_NIOS2_IMM8, 0); | |
2503 | insn->constant_bits |= SET_IW_F3X8_N (val); | |
2504 | break; | |
2505 | default: | |
2506 | bad_opcode (op); | |
2507 | } | |
2508 | } | |
2509 | ||
2510 | /* 26-bit unsigned immediate. */ | |
3739860c | 2511 | static void |
c8c8175b SL |
2512 | nios2_assemble_arg_m (const char *token, nios2_insn_infoS *insn) |
2513 | { | |
2514 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2515 | unsigned int val; | |
2516 | ||
2517 | switch (op->format) | |
2518 | { | |
2519 | case iw_j_type: | |
96ba4233 SL |
2520 | val = nios2_assemble_expression (token, insn, |
2521 | (nios2_as_options.noat | |
2522 | ? BFD_RELOC_NIOS2_CALL26_NOAT | |
2523 | : BFD_RELOC_NIOS2_CALL26), | |
2524 | 0); | |
2525 | insn->constant_bits |= SET_IW_J_IMM26 (val); | |
2526 | break; | |
c8c8175b SL |
2527 | case iw_L26_type: |
2528 | val = nios2_assemble_expression (token, insn, | |
2529 | (nios2_as_options.noat | |
2530 | ? BFD_RELOC_NIOS2_CALL26_NOAT | |
2531 | : BFD_RELOC_NIOS2_CALL26), | |
2532 | 0); | |
2533 | insn->constant_bits |= SET_IW_L26_IMM26 (val); | |
2534 | break; | |
2535 | default: | |
2536 | bad_opcode (op); | |
2537 | } | |
2538 | } | |
2539 | ||
2540 | /* 6-bit unsigned immediate with no shifting. */ | |
3739860c | 2541 | static void |
c8c8175b SL |
2542 | nios2_assemble_arg_M (const char *token, nios2_insn_infoS *insn) |
2543 | { | |
2544 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2545 | unsigned int val; | |
2546 | ||
2547 | switch (op->format) | |
2548 | { | |
2549 | case iw_T1X1I6_type: | |
2550 | val = nios2_assemble_expression (token, insn, | |
2551 | BFD_RELOC_NIOS2_R2_T1X1I6, 0); | |
2552 | insn->constant_bits |= SET_IW_T1X1I6_IMM6 (val); | |
2553 | break; | |
2554 | default: | |
2555 | bad_opcode (op); | |
2556 | } | |
2557 | } | |
2558 | ||
2559 | /* 6-bit unsigned immediate with 2-bit shift. */ | |
3739860c | 2560 | static void |
c8c8175b SL |
2561 | nios2_assemble_arg_N (const char *token, nios2_insn_infoS *insn) |
2562 | { | |
2563 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2564 | unsigned int val; | |
2565 | ||
2566 | switch (op->format) | |
2567 | { | |
2568 | case iw_T1X1I6_type: | |
2569 | val = nios2_assemble_expression (token, insn, | |
2570 | BFD_RELOC_NIOS2_R2_T1X1I6_2, 0); | |
2571 | insn->constant_bits |= SET_IW_T1X1I6_IMM6 (val >> 2); | |
2572 | break; | |
2573 | default: | |
2574 | bad_opcode (op); | |
2575 | } | |
2576 | } | |
2577 | ||
2578 | ||
2579 | /* Encoded enumeration for addi.n/subi.n. */ | |
3739860c | 2580 | static void |
c8c8175b SL |
2581 | nios2_assemble_arg_e (const char *token, nios2_insn_infoS *insn) |
2582 | { | |
2583 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2584 | unsigned int val; | |
2585 | int i; | |
2586 | ||
2587 | switch (op->format) | |
2588 | { | |
2589 | case iw_T2X1I3_type: | |
2590 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); | |
2591 | for (i = 0; i < nios2_num_r2_asi_n_mappings; i++) | |
2592 | if (val == nios2_r2_asi_n_mappings[i]) | |
2593 | break; | |
2594 | if (i == nios2_num_r2_asi_n_mappings) | |
2595 | { | |
2596 | as_bad (_("Invalid constant operand %s"), token); | |
2597 | return; | |
2598 | } | |
2599 | insn->insn_code |= SET_IW_T2X1I3_IMM3 ((unsigned)i); | |
2600 | break; | |
2601 | default: | |
2602 | bad_opcode (op); | |
2603 | } | |
2604 | } | |
2605 | ||
2606 | /* Encoded enumeration for slli.n/srli.n. */ | |
3739860c | 2607 | static void |
c8c8175b SL |
2608 | nios2_assemble_arg_f (const char *token, nios2_insn_infoS *insn) |
2609 | { | |
2610 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2611 | unsigned int val; | |
2612 | int i; | |
2613 | ||
2614 | switch (op->format) | |
2615 | { | |
2616 | case iw_T2X1L3_type: | |
2617 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); | |
2618 | for (i = 0; i < nios2_num_r2_shi_n_mappings; i++) | |
2619 | if (val == nios2_r2_shi_n_mappings[i]) | |
2620 | break; | |
2621 | if (i == nios2_num_r2_shi_n_mappings) | |
2622 | { | |
2623 | as_bad (_("Invalid constant operand %s"), token); | |
2624 | return; | |
2625 | } | |
2626 | insn->insn_code |= SET_IW_T2X1L3_SHAMT ((unsigned)i); | |
2627 | break; | |
2628 | default: | |
2629 | bad_opcode (op); | |
2630 | } | |
2631 | } | |
2632 | ||
2633 | /* Encoded enumeration for andi.n. */ | |
3739860c | 2634 | static void |
c8c8175b SL |
2635 | nios2_assemble_arg_g (const char *token, nios2_insn_infoS *insn) |
2636 | { | |
2637 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2638 | unsigned int val; | |
2639 | int i; | |
2640 | ||
2641 | switch (op->format) | |
2642 | { | |
2643 | case iw_T2I4_type: | |
2644 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); | |
2645 | for (i = 0; i < nios2_num_r2_andi_n_mappings; i++) | |
2646 | if (val == nios2_r2_andi_n_mappings[i]) | |
2647 | break; | |
2648 | if (i == nios2_num_r2_andi_n_mappings) | |
2649 | { | |
2650 | as_bad (_("Invalid constant operand %s"), token); | |
2651 | return; | |
2652 | } | |
2653 | insn->insn_code |= SET_IW_T2I4_IMM4 ((unsigned)i); | |
2654 | break; | |
2655 | default: | |
2656 | bad_opcode (op); | |
2657 | } | |
2658 | } | |
2659 | ||
2660 | /* Encoded enumeration for movi.n. */ | |
3739860c | 2661 | static void |
c8c8175b SL |
2662 | nios2_assemble_arg_h (const char *token, nios2_insn_infoS *insn) |
2663 | { | |
2664 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2665 | unsigned int val; | |
2666 | int i; | |
2667 | ||
2668 | switch (op->format) | |
2669 | { | |
2670 | case iw_T1I7_type: | |
2671 | val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0); | |
2672 | i = (signed) val; | |
2673 | if ((signed) i == -1) | |
2674 | val = 127; | |
2675 | else if (i == -2) | |
2676 | val = 126; | |
2677 | else if (i == 0xff) | |
2678 | val = 125; | |
2679 | else if (i < 0 || i > 125) | |
2680 | { | |
2681 | as_bad (_("Invalid constant operand %s"), token); | |
2682 | return; | |
2683 | } | |
2684 | insn->insn_code |= SET_IW_T1I7_IMM7 (val); | |
2685 | break; | |
2686 | default: | |
2687 | bad_opcode (op); | |
2688 | } | |
2689 | } | |
2690 | ||
2691 | /* Encoded REGMASK for ldwm/stwm or push.n/pop.n. */ | |
3739860c | 2692 | static void |
c8c8175b SL |
2693 | nios2_assemble_arg_R (const char *token, nios2_insn_infoS *insn) |
2694 | { | |
2695 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2696 | unsigned long mask; | |
2697 | char *buf = strdup (token); | |
2698 | unsigned long reglist = nios2_parse_reglist (buf, op); | |
2699 | free (buf); | |
2700 | ||
2701 | if (reglist == 0) | |
2702 | return; | |
2703 | ||
2704 | switch (op->format) | |
2705 | { | |
2706 | case iw_F1X4L17_type: | |
2707 | /* Encoding for ldwm/stwm. */ | |
2708 | if (reglist & 0x00003ffc) | |
2709 | mask = reglist >> 2; | |
2710 | else | |
2711 | { | |
2712 | insn->insn_code |= SET_IW_F1X4L17_RS (1); | |
2713 | mask = (reglist & 0x00ffc000) >> 14; | |
2714 | if (reglist & (1 << 28)) | |
2715 | mask |= 1 << 10; | |
2716 | if (reglist & (1 << 31)) | |
2717 | mask |= 1 << 11; | |
2718 | } | |
2719 | insn->insn_code |= SET_IW_F1X4L17_REGMASK (mask); | |
2720 | break; | |
2721 | ||
2722 | case iw_L5I4X1_type: | |
2723 | /* Encoding for push.n/pop.n. */ | |
2724 | if (reglist & (1 << 28)) | |
2725 | insn->insn_code |= SET_IW_L5I4X1_FP (1); | |
2726 | mask = reglist & 0x00ff0000; | |
2727 | if (mask) | |
2728 | { | |
2729 | int i; | |
2730 | ||
2731 | for (i = 0; i < nios2_num_r2_reg_range_mappings; i++) | |
2732 | if (nios2_r2_reg_range_mappings[i] == mask) | |
2733 | break; | |
2734 | if (i == nios2_num_r2_reg_range_mappings) | |
2735 | { | |
2736 | as_bad ("invalid reglist"); | |
2737 | return; | |
2738 | } | |
2739 | insn->insn_code |= SET_IW_L5I4X1_REGRANGE (i); | |
2740 | insn->insn_code |= SET_IW_L5I4X1_CS (1); | |
2741 | } | |
2742 | break; | |
3739860c | 2743 | |
c8c8175b SL |
2744 | default: |
2745 | bad_opcode (op); | |
2746 | } | |
2747 | } | |
2748 | ||
2749 | /* Base register for ldwm/stwm. */ | |
3739860c | 2750 | static void |
c8c8175b SL |
2751 | nios2_assemble_arg_B (const char *token, nios2_insn_infoS *insn) |
2752 | { | |
2753 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
2754 | int direction, writeback, ret; | |
2755 | char *str = strdup (token); | |
2756 | struct nios2_reg *reg | |
2757 | = nios2_parse_base_register (str, &direction, &writeback, &ret); | |
2758 | ||
2759 | free (str); | |
2760 | if (!reg) | |
2761 | return; | |
2762 | ||
2763 | switch (op->format) | |
2764 | { | |
2765 | case iw_F1X4L17_type: | |
3739860c | 2766 | /* For ldwm, check to see if the base register is already inside the |
c8c8175b SL |
2767 | register list. */ |
2768 | if (op->match == MATCH_R2_LDWM | |
2769 | && (nios2_reglist_mask & (1 << reg->index))) | |
2770 | { | |
2771 | as_bad ("invalid base register; %s is inside the reglist", reg->name); | |
2772 | return; | |
2773 | } | |
2774 | ||
2775 | /* For stwm, ret option is not allowed. */ | |
2776 | if (op->match == MATCH_R2_STWM && ret) | |
2777 | { | |
2778 | as_bad ("invalid option syntax"); | |
2779 | return; | |
2780 | } | |
2781 | ||
2782 | /* Check that the direction matches the ordering of the reglist. */ | |
2783 | if (nios2_reglist_dir && direction != nios2_reglist_dir) | |
2784 | { | |
2785 | as_bad ("reglist order does not match increment/decrement mode"); | |
2786 | return; | |
2787 | } | |
2788 | ||
2789 | insn->insn_code |= SET_IW_F1X4L17_A (reg->index); | |
2790 | if (direction > 0) | |
2791 | insn->insn_code |= SET_IW_F1X4L17_ID (1); | |
2792 | if (writeback) | |
2793 | insn->insn_code |= SET_IW_F1X4L17_WB (1); | |
2794 | if (ret) | |
2795 | insn->insn_code |= SET_IW_F1X4L17_PC (1); | |
2796 | break; | |
2797 | ||
96ba4233 SL |
2798 | default: |
2799 | bad_opcode (op); | |
36591ba1 SL |
2800 | } |
2801 | } | |
2802 | ||
2803 | static void | |
96ba4233 | 2804 | nios2_assemble_args (nios2_insn_infoS *insn) |
36591ba1 | 2805 | { |
96ba4233 SL |
2806 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
2807 | const char *argptr; | |
2808 | unsigned int tokidx, ntok; | |
36591ba1 | 2809 | |
96ba4233 SL |
2810 | /* Make sure there are enough arguments. */ |
2811 | ntok = (op->pinfo & NIOS2_INSN_OPTARG) ? op->num_args - 1 : op->num_args; | |
2812 | for (tokidx = 1; tokidx <= ntok; tokidx++) | |
2813 | if (insn->insn_tokens[tokidx] == NULL) | |
2814 | { | |
2815 | as_bad ("missing argument"); | |
2816 | return; | |
2817 | } | |
36591ba1 | 2818 | |
96ba4233 SL |
2819 | for (argptr = op->args, tokidx = 1; |
2820 | *argptr && insn->insn_tokens[tokidx]; | |
2821 | argptr++) | |
2822 | switch (*argptr) | |
2823 | { | |
2824 | case ',': | |
2825 | case '(': | |
2826 | case ')': | |
2827 | break; | |
36591ba1 | 2828 | |
96ba4233 SL |
2829 | case 'c': |
2830 | nios2_assemble_arg_c (insn->insn_tokens[tokidx++], insn); | |
2831 | break; | |
3739860c | 2832 | |
96ba4233 SL |
2833 | case 'd': |
2834 | nios2_assemble_arg_d (insn->insn_tokens[tokidx++], insn); | |
2835 | break; | |
3739860c | 2836 | |
96ba4233 SL |
2837 | case 's': |
2838 | nios2_assemble_arg_s (insn->insn_tokens[tokidx++], insn); | |
2839 | break; | |
3739860c | 2840 | |
96ba4233 SL |
2841 | case 't': |
2842 | nios2_assemble_arg_t (insn->insn_tokens[tokidx++], insn); | |
2843 | break; | |
3739860c | 2844 | |
c8c8175b SL |
2845 | case 'D': |
2846 | nios2_assemble_arg_D (insn->insn_tokens[tokidx++], insn); | |
2847 | break; | |
3739860c | 2848 | |
c8c8175b SL |
2849 | case 'S': |
2850 | nios2_assemble_arg_S (insn->insn_tokens[tokidx++], insn); | |
2851 | break; | |
3739860c | 2852 | |
c8c8175b SL |
2853 | case 'T': |
2854 | nios2_assemble_arg_T (insn->insn_tokens[tokidx++], insn); | |
2855 | break; | |
3739860c | 2856 | |
96ba4233 SL |
2857 | case 'i': |
2858 | nios2_assemble_arg_i (insn->insn_tokens[tokidx++], insn); | |
2859 | break; | |
3739860c | 2860 | |
c8c8175b SL |
2861 | case 'I': |
2862 | nios2_assemble_arg_I (insn->insn_tokens[tokidx++], insn); | |
2863 | break; | |
3739860c | 2864 | |
96ba4233 SL |
2865 | case 'u': |
2866 | nios2_assemble_arg_u (insn->insn_tokens[tokidx++], insn); | |
2867 | break; | |
3739860c | 2868 | |
c8c8175b SL |
2869 | case 'U': |
2870 | nios2_assemble_arg_U (insn->insn_tokens[tokidx++], insn); | |
2871 | break; | |
3739860c | 2872 | |
c8c8175b SL |
2873 | case 'V': |
2874 | nios2_assemble_arg_V (insn->insn_tokens[tokidx++], insn); | |
2875 | break; | |
3739860c | 2876 | |
c8c8175b SL |
2877 | case 'W': |
2878 | nios2_assemble_arg_W (insn->insn_tokens[tokidx++], insn); | |
2879 | break; | |
3739860c | 2880 | |
c8c8175b SL |
2881 | case 'X': |
2882 | nios2_assemble_arg_X (insn->insn_tokens[tokidx++], insn); | |
2883 | break; | |
3739860c | 2884 | |
c8c8175b SL |
2885 | case 'Y': |
2886 | nios2_assemble_arg_Y (insn->insn_tokens[tokidx++], insn); | |
2887 | break; | |
3739860c | 2888 | |
96ba4233 SL |
2889 | case 'o': |
2890 | nios2_assemble_arg_o (insn->insn_tokens[tokidx++], insn); | |
2891 | break; | |
3739860c | 2892 | |
c8c8175b SL |
2893 | case 'O': |
2894 | nios2_assemble_arg_O (insn->insn_tokens[tokidx++], insn); | |
2895 | break; | |
3739860c | 2896 | |
c8c8175b SL |
2897 | case 'P': |
2898 | nios2_assemble_arg_P (insn->insn_tokens[tokidx++], insn); | |
2899 | break; | |
2900 | ||
96ba4233 SL |
2901 | case 'j': |
2902 | nios2_assemble_arg_j (insn->insn_tokens[tokidx++], insn); | |
2903 | break; | |
3739860c | 2904 | |
c8c8175b SL |
2905 | case 'k': |
2906 | nios2_assemble_arg_k (insn->insn_tokens[tokidx++], insn); | |
2907 | break; | |
3739860c | 2908 | |
96ba4233 SL |
2909 | case 'l': |
2910 | nios2_assemble_arg_l (insn->insn_tokens[tokidx++], insn); | |
2911 | break; | |
3739860c | 2912 | |
96ba4233 SL |
2913 | case 'm': |
2914 | nios2_assemble_arg_m (insn->insn_tokens[tokidx++], insn); | |
2915 | break; | |
c8c8175b SL |
2916 | |
2917 | case 'M': | |
2918 | nios2_assemble_arg_M (insn->insn_tokens[tokidx++], insn); | |
2919 | break; | |
2920 | ||
2921 | case 'N': | |
2922 | nios2_assemble_arg_N (insn->insn_tokens[tokidx++], insn); | |
2923 | break; | |
2924 | ||
2925 | case 'e': | |
2926 | nios2_assemble_arg_e (insn->insn_tokens[tokidx++], insn); | |
2927 | break; | |
3739860c | 2928 | |
c8c8175b SL |
2929 | case 'f': |
2930 | nios2_assemble_arg_f (insn->insn_tokens[tokidx++], insn); | |
2931 | break; | |
3739860c | 2932 | |
c8c8175b SL |
2933 | case 'g': |
2934 | nios2_assemble_arg_g (insn->insn_tokens[tokidx++], insn); | |
2935 | break; | |
3739860c | 2936 | |
c8c8175b SL |
2937 | case 'h': |
2938 | nios2_assemble_arg_h (insn->insn_tokens[tokidx++], insn); | |
2939 | break; | |
3739860c | 2940 | |
c8c8175b SL |
2941 | case 'R': |
2942 | nios2_assemble_arg_R (insn->insn_tokens[tokidx++], insn); | |
2943 | break; | |
2944 | ||
2945 | case 'B': | |
2946 | nios2_assemble_arg_B (insn->insn_tokens[tokidx++], insn); | |
2947 | break; | |
2948 | ||
96ba4233 SL |
2949 | default: |
2950 | bad_opcode (op); | |
2951 | break; | |
2952 | } | |
36591ba1 | 2953 | |
3739860c | 2954 | /* Perform argument checking. */ |
96ba4233 SL |
2955 | nios2_check_assembly (insn->insn_code | insn->constant_bits, |
2956 | insn->insn_tokens[tokidx]); | |
2957 | } | |
36591ba1 | 2958 | |
36591ba1 SL |
2959 | |
2960 | /* The function consume_arg takes a pointer into a string | |
2961 | of instruction tokens (args) and a pointer into a string | |
2962 | representing the expected sequence of tokens and separators. | |
2963 | It checks whether the first argument in argstr is of the | |
2964 | expected type, throwing an error if it is not, and returns | |
2965 | the pointer argstr. */ | |
2966 | static char * | |
96ba4233 | 2967 | nios2_consume_arg (char *argstr, const char *parsestr) |
36591ba1 SL |
2968 | { |
2969 | char *temp; | |
3739860c | 2970 | |
36591ba1 SL |
2971 | switch (*parsestr) |
2972 | { | |
2973 | case 'c': | |
36591ba1 SL |
2974 | case 'd': |
2975 | case 's': | |
2976 | case 't': | |
c8c8175b SL |
2977 | case 'D': |
2978 | case 'S': | |
2979 | case 'T': | |
36591ba1 | 2980 | break; |
96ba4233 | 2981 | |
36591ba1 SL |
2982 | case 'i': |
2983 | case 'u': | |
2984 | if (*argstr == '%') | |
2985 | { | |
2986 | if (nios2_special_relocation_p (argstr)) | |
2987 | { | |
2988 | /* We zap the parentheses because we don't want them confused | |
2989 | with separators. */ | |
2990 | temp = strchr (argstr, '('); | |
2991 | if (temp != NULL) | |
2992 | *temp = ' '; | |
2993 | temp = strchr (argstr, ')'); | |
2994 | if (temp != NULL) | |
2995 | *temp = ' '; | |
2996 | } | |
2997 | else | |
2998 | as_bad (_("badly formed expression near %s"), argstr); | |
2999 | } | |
3000 | break; | |
3001 | case 'm': | |
3002 | case 'j': | |
c8c8175b | 3003 | case 'k': |
36591ba1 | 3004 | case 'l': |
c8c8175b SL |
3005 | case 'I': |
3006 | case 'U': | |
3007 | case 'V': | |
3008 | case 'W': | |
3009 | case 'X': | |
3010 | case 'Y': | |
3011 | case 'O': | |
3012 | case 'P': | |
3013 | case 'e': | |
3014 | case 'f': | |
3015 | case 'g': | |
3016 | case 'h': | |
3017 | case 'M': | |
3018 | case 'N': | |
3739860c | 3019 | |
36591ba1 SL |
3020 | /* We can't have %hi, %lo or %hiadj here. */ |
3021 | if (*argstr == '%') | |
3022 | as_bad (_("badly formed expression near %s"), argstr); | |
3023 | break; | |
c8c8175b SL |
3024 | |
3025 | case 'R': | |
3026 | /* Register list for ldwm/stwm or push.n/pop.n. Replace the commas | |
3027 | in the list with spaces so we don't confuse them with separators. */ | |
3028 | if (*argstr != '{') | |
3029 | { | |
3030 | as_bad ("missing '{' in register list"); | |
3031 | break; | |
3032 | } | |
3033 | for (temp = argstr + 1; *temp; temp++) | |
3034 | { | |
3035 | if (*temp == '}') | |
3036 | break; | |
3037 | else if (*temp == ',') | |
3038 | *temp = ' '; | |
3039 | } | |
3040 | if (!*temp) | |
3041 | { | |
3042 | as_bad ("missing '}' in register list"); | |
3043 | break; | |
3044 | } | |
3045 | break; | |
3046 | ||
3047 | case 'B': | |
3048 | /* Base register and options for ldwm/stwm. This is the final argument | |
3049 | and consumes the rest of the argument string; replace commas | |
3050 | with spaces so that the token splitter doesn't think they are | |
3051 | separate arguments. */ | |
3052 | for (temp = argstr; *temp; temp++) | |
3053 | if (*temp == ',') | |
3054 | *temp = ' '; | |
3055 | break; | |
3056 | ||
531a94fd | 3057 | case 'o': |
fad16e30 | 3058 | case 'E': |
531a94fd | 3059 | break; |
36591ba1 | 3060 | default: |
531a94fd | 3061 | BAD_CASE (*parsestr); |
36591ba1 SL |
3062 | break; |
3063 | } | |
3064 | ||
3065 | return argstr; | |
3066 | } | |
3067 | ||
3068 | /* The function consume_separator takes a pointer into a string | |
3069 | of instruction tokens (args) and a pointer into a string representing | |
3070 | the expected sequence of tokens and separators. It finds the first | |
3071 | instance of the character pointed to by separator in argstr, and | |
3072 | returns a pointer to the next element of argstr, which is the | |
3073 | following token in the sequence. */ | |
3074 | static char * | |
3075 | nios2_consume_separator (char *argstr, const char *separator) | |
3076 | { | |
3077 | char *p; | |
3078 | ||
3079 | /* If we have a opcode reg, expr(reg) type instruction, and | |
3080 | * we are separating the expr from the (reg), we find the last | |
3081 | * (, just in case the expression has parentheses. */ | |
3082 | ||
3083 | if (*separator == '(') | |
3084 | p = strrchr (argstr, *separator); | |
3085 | else | |
3086 | p = strchr (argstr, *separator); | |
3087 | ||
3088 | if (p != NULL) | |
3089 | *p++ = 0; | |
36591ba1 SL |
3090 | return p; |
3091 | } | |
3092 | ||
36591ba1 SL |
3093 | /* The principal argument parsing function which takes a string argstr |
3094 | representing the instruction arguments for insn, and extracts the argument | |
3095 | tokens matching parsestr into parsed_args. */ | |
3096 | static void | |
3097 | nios2_parse_args (nios2_insn_infoS *insn, char *argstr, | |
3098 | const char *parsestr, char **parsed_args) | |
3099 | { | |
3100 | char *p; | |
3101 | char *end = NULL; | |
3102 | int i; | |
3103 | p = argstr; | |
3104 | i = 0; | |
3105 | bfd_boolean terminate = FALSE; | |
3739860c | 3106 | |
36591ba1 SL |
3107 | /* This rest of this function is it too fragile and it mostly works, |
3108 | therefore special case this one. */ | |
3109 | if (*parsestr == 0 && argstr != 0) | |
3110 | { | |
3111 | as_bad (_("too many arguments")); | |
3112 | parsed_args[0] = NULL; | |
3113 | return; | |
3114 | } | |
3739860c | 3115 | |
36591ba1 SL |
3116 | while (p != NULL && !terminate && i < NIOS2_MAX_INSN_TOKENS) |
3117 | { | |
96ba4233 | 3118 | parsed_args[i] = nios2_consume_arg (p, parsestr); |
36591ba1 | 3119 | ++parsestr; |
96ba4233 | 3120 | while (*parsestr == '(' || *parsestr == ')' || *parsestr == ',') |
36591ba1 | 3121 | { |
96ba4233 | 3122 | char *context = p; |
36591ba1 | 3123 | p = nios2_consume_separator (p, parsestr); |
96ba4233 SL |
3124 | /* Check for missing separators. */ |
3125 | if (!p && !(insn->insn_nios2_opcode->pinfo & NIOS2_INSN_OPTARG)) | |
3126 | { | |
3127 | as_bad (_("expecting %c near %s"), *parsestr, context); | |
3128 | break; | |
3129 | } | |
36591ba1 SL |
3130 | ++parsestr; |
3131 | } | |
96ba4233 SL |
3132 | |
3133 | if (*parsestr == '\0') | |
36591ba1 SL |
3134 | { |
3135 | /* Check that the argument string has no trailing arguments. */ | |
96ba4233 | 3136 | end = strpbrk (p, ","); |
36591ba1 SL |
3137 | if (end != NULL) |
3138 | as_bad (_("too many arguments")); | |
3139 | } | |
3140 | ||
3141 | if (*parsestr == '\0' || (p != NULL && *p == '\0')) | |
3142 | terminate = TRUE; | |
3143 | ++i; | |
3144 | } | |
3145 | ||
3146 | parsed_args[i] = NULL; | |
36591ba1 SL |
3147 | } |
3148 | ||
3149 | ||
3150 | \f | |
3151 | /** Support for pseudo-op parsing. These are macro-like opcodes that | |
3152 | expand into real insns by suitable fiddling with the operands. */ | |
3153 | ||
3154 | /* Append the string modifier to the string contained in the argument at | |
3155 | parsed_args[ndx]. */ | |
3156 | static void | |
3157 | nios2_modify_arg (char **parsed_args, const char *modifier, | |
3158 | int unused ATTRIBUTE_UNUSED, int ndx) | |
3159 | { | |
3160 | char *tmp = parsed_args[ndx]; | |
3161 | ||
3162 | parsed_args[ndx] | |
3163 | = (char *) malloc (strlen (parsed_args[ndx]) + strlen (modifier) + 1); | |
3164 | strcpy (parsed_args[ndx], tmp); | |
3165 | strcat (parsed_args[ndx], modifier); | |
3166 | } | |
3167 | ||
3168 | /* Modify parsed_args[ndx] by negating that argument. */ | |
3169 | static void | |
3170 | nios2_negate_arg (char **parsed_args, const char *modifier ATTRIBUTE_UNUSED, | |
3171 | int unused ATTRIBUTE_UNUSED, int ndx) | |
3172 | { | |
3173 | char *tmp = parsed_args[ndx]; | |
3174 | ||
3175 | parsed_args[ndx] | |
3176 | = (char *) malloc (strlen ("~(") + strlen (parsed_args[ndx]) + | |
3177 | strlen (")+1") + 1); | |
3178 | ||
3179 | strcpy (parsed_args[ndx], "~("); | |
3180 | strcat (parsed_args[ndx], tmp); | |
3181 | strcat (parsed_args[ndx], ")+1"); | |
3182 | } | |
3183 | ||
3184 | /* The function nios2_swap_args swaps the pointers at indices index_1 and | |
3185 | index_2 in the array parsed_args[] - this is used for operand swapping | |
3186 | for comparison operations. */ | |
3187 | static void | |
3188 | nios2_swap_args (char **parsed_args, const char *unused ATTRIBUTE_UNUSED, | |
3189 | int index_1, int index_2) | |
3190 | { | |
3191 | char *tmp; | |
3192 | gas_assert (index_1 < NIOS2_MAX_INSN_TOKENS | |
3193 | && index_2 < NIOS2_MAX_INSN_TOKENS); | |
3194 | tmp = parsed_args[index_1]; | |
3195 | parsed_args[index_1] = parsed_args[index_2]; | |
3196 | parsed_args[index_2] = tmp; | |
3197 | } | |
3198 | ||
3199 | /* This function appends the string appnd to the array of strings in | |
3200 | parsed_args num times starting at index start in the array. */ | |
3201 | static void | |
3202 | nios2_append_arg (char **parsed_args, const char *appnd, int num, | |
3203 | int start) | |
3204 | { | |
3205 | int i, count; | |
3206 | char *tmp; | |
3207 | ||
3208 | gas_assert ((start + num) < NIOS2_MAX_INSN_TOKENS); | |
3209 | ||
3210 | if (nios2_mode == NIOS2_MODE_TEST) | |
3211 | tmp = parsed_args[start]; | |
3212 | else | |
3213 | tmp = NULL; | |
3214 | ||
3215 | for (i = start, count = num; count > 0; ++i, --count) | |
3216 | parsed_args[i] = (char *) appnd; | |
3217 | ||
3218 | gas_assert (i == (start + num)); | |
3219 | parsed_args[i] = tmp; | |
3220 | parsed_args[i + 1] = NULL; | |
3221 | } | |
3222 | ||
3739860c | 3223 | /* This function inserts the string insert num times in the array |
36591ba1 SL |
3224 | parsed_args, starting at the index start. */ |
3225 | static void | |
3226 | nios2_insert_arg (char **parsed_args, const char *insert, int num, | |
3227 | int start) | |
3228 | { | |
3229 | int i, count; | |
3230 | ||
3231 | gas_assert ((start + num) < NIOS2_MAX_INSN_TOKENS); | |
3232 | ||
3233 | /* Move the existing arguments up to create space. */ | |
3234 | for (i = NIOS2_MAX_INSN_TOKENS; i - num >= start; --i) | |
3235 | parsed_args[i] = parsed_args[i - num]; | |
3236 | ||
3237 | for (i = start, count = num; count > 0; ++i, --count) | |
3238 | parsed_args[i] = (char *) insert; | |
3239 | } | |
3240 | ||
3241 | /* Cleanup function to free malloc'ed arg strings. */ | |
3242 | static void | |
3243 | nios2_free_arg (char **parsed_args, int num ATTRIBUTE_UNUSED, int start) | |
3244 | { | |
3245 | if (parsed_args[start]) | |
3246 | { | |
3247 | free (parsed_args[start]); | |
3248 | parsed_args[start] = NULL; | |
3249 | } | |
3250 | } | |
3251 | ||
3252 | /* This function swaps the pseudo-op for a real op. */ | |
3253 | static nios2_ps_insn_infoS* | |
3254 | nios2_translate_pseudo_insn (nios2_insn_infoS *insn) | |
3255 | { | |
3256 | ||
3257 | nios2_ps_insn_infoS *ps_insn; | |
3258 | ||
3259 | /* Find which real insn the pseudo-op transates to and | |
3260 | switch the insn_info ptr to point to it. */ | |
3261 | ps_insn = nios2_ps_lookup (insn->insn_nios2_opcode->name); | |
3262 | ||
3263 | if (ps_insn != NULL) | |
3264 | { | |
3265 | insn->insn_nios2_opcode = nios2_opcode_lookup (ps_insn->insn); | |
3266 | insn->insn_tokens[0] = insn->insn_nios2_opcode->name; | |
3267 | /* Modify the args so they work with the real insn. */ | |
3268 | ps_insn->arg_modifer_func ((char **) insn->insn_tokens, | |
3269 | ps_insn->arg_modifier, ps_insn->num, | |
3270 | ps_insn->index); | |
3271 | } | |
3272 | else | |
3273 | /* we cannot recover from this. */ | |
3274 | as_fatal (_("unrecognized pseudo-instruction %s"), | |
c8c8175b | 3275 | insn->insn_nios2_opcode->name); |
36591ba1 SL |
3276 | return ps_insn; |
3277 | } | |
3278 | ||
3279 | /* Invoke the cleanup handler for pseudo-insn ps_insn on insn. */ | |
3280 | static void | |
3281 | nios2_cleanup_pseudo_insn (nios2_insn_infoS *insn, | |
3282 | nios2_ps_insn_infoS *ps_insn) | |
3283 | { | |
3284 | if (ps_insn->arg_cleanup_func) | |
3285 | (ps_insn->arg_cleanup_func) ((char **) insn->insn_tokens, | |
3286 | ps_insn->num, ps_insn->index); | |
3287 | } | |
3288 | ||
3289 | const nios2_ps_insn_infoS nios2_ps_insn_info_structs[] = { | |
3290 | /* pseudo-op, real-op, arg, arg_modifier_func, num, index, arg_cleanup_func */ | |
3291 | {"mov", "add", nios2_append_arg, "zero", 1, 3, NULL}, | |
3292 | {"movi", "addi", nios2_insert_arg, "zero", 1, 2, NULL}, | |
3293 | {"movhi", "orhi", nios2_insert_arg, "zero", 1, 2, NULL}, | |
3294 | {"movui", "ori", nios2_insert_arg, "zero", 1, 2, NULL}, | |
3295 | {"movia", "orhi", nios2_insert_arg, "zero", 1, 2, NULL}, | |
3296 | {"nop", "add", nios2_append_arg, "zero", 3, 1, NULL}, | |
3297 | {"bgt", "blt", nios2_swap_args, "", 1, 2, NULL}, | |
3298 | {"bgtu", "bltu", nios2_swap_args, "", 1, 2, NULL}, | |
3299 | {"ble", "bge", nios2_swap_args, "", 1, 2, NULL}, | |
3300 | {"bleu", "bgeu", nios2_swap_args, "", 1, 2, NULL}, | |
3301 | {"cmpgt", "cmplt", nios2_swap_args, "", 2, 3, NULL}, | |
3302 | {"cmpgtu", "cmpltu", nios2_swap_args, "", 2, 3, NULL}, | |
3303 | {"cmple", "cmpge", nios2_swap_args, "", 2, 3, NULL}, | |
3304 | {"cmpleu", "cmpgeu", nios2_swap_args, "", 2, 3, NULL}, | |
3305 | {"cmpgti", "cmpgei", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, | |
3306 | {"cmpgtui", "cmpgeui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, | |
3307 | {"cmplei", "cmplti", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, | |
3308 | {"cmpleui", "cmpltui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg}, | |
c8c8175b SL |
3309 | {"subi", "addi", nios2_negate_arg, "", 0, 3, nios2_free_arg}, |
3310 | {"nop.n", "mov.n", nios2_append_arg, "zero", 2, 1, NULL} | |
36591ba1 SL |
3311 | /* Add further pseudo-ops here. */ |
3312 | }; | |
3313 | ||
3314 | #define NIOS2_NUM_PSEUDO_INSNS \ | |
3315 | ((sizeof(nios2_ps_insn_info_structs)/ \ | |
3316 | sizeof(nios2_ps_insn_info_structs[0]))) | |
3317 | const int nios2_num_ps_insn_info_structs = NIOS2_NUM_PSEUDO_INSNS; | |
3318 | ||
3319 | \f | |
3320 | /** Assembler output support. */ | |
3321 | ||
36591ba1 SL |
3322 | /* Output a normal instruction. */ |
3323 | static void | |
3324 | output_insn (nios2_insn_infoS *insn) | |
3325 | { | |
3326 | char *f; | |
3739860c | 3327 | nios2_insn_relocS *reloc; |
96ba4233 | 3328 | f = frag_more (insn->insn_nios2_opcode->size); |
36591ba1 SL |
3329 | /* This allocates enough space for the instruction |
3330 | and puts it in the current frag. */ | |
96ba4233 | 3331 | md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size); |
36591ba1 | 3332 | /* Emit debug info. */ |
96ba4233 | 3333 | dwarf2_emit_insn (insn->insn_nios2_opcode->size); |
36591ba1 | 3334 | /* Create any fixups to be acted on later. */ |
96ba4233 | 3335 | |
36591ba1 | 3336 | for (reloc = insn->insn_reloc; reloc != NULL; reloc = reloc->reloc_next) |
96ba4233 SL |
3337 | fix_new_exp (frag_now, f - frag_now->fr_literal, |
3338 | insn->insn_nios2_opcode->size, | |
36591ba1 SL |
3339 | &reloc->reloc_expression, reloc->reloc_pcrel, |
3340 | reloc->reloc_type); | |
3341 | } | |
3342 | ||
3343 | /* Output an unconditional branch. */ | |
3344 | static void | |
3345 | output_ubranch (nios2_insn_infoS *insn) | |
3346 | { | |
3347 | nios2_insn_relocS *reloc = insn->insn_reloc; | |
3348 | ||
3349 | /* If the reloc is NULL, there was an error assembling the branch. */ | |
3350 | if (reloc != NULL) | |
3351 | { | |
3352 | symbolS *symp = reloc->reloc_expression.X_add_symbol; | |
3353 | offsetT offset = reloc->reloc_expression.X_add_number; | |
3354 | char *f; | |
c8c8175b | 3355 | bfd_boolean is_cdx = (insn->insn_nios2_opcode->size == 2); |
36591ba1 SL |
3356 | |
3357 | /* Tag dwarf2 debug info to the address at the start of the insn. | |
3358 | We must do it before frag_var() below closes off the frag. */ | |
3359 | dwarf2_emit_insn (0); | |
3360 | ||
3361 | /* We create a machine dependent frag which can grow | |
3362 | to accommodate the largest possible instruction sequence | |
3363 | this may generate. */ | |
3364 | f = frag_var (rs_machine_dependent, | |
96ba4233 | 3365 | UBRANCH_MAX_SIZE, insn->insn_nios2_opcode->size, |
c8c8175b SL |
3366 | (is_cdx ? CDX_UBRANCH_SUBTYPE (0) : UBRANCH_SUBTYPE (0)), |
3367 | symp, offset, NULL); | |
36591ba1 | 3368 | |
96ba4233 | 3369 | md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size); |
36591ba1 SL |
3370 | |
3371 | /* We leave fixup generation to md_convert_frag. */ | |
3372 | } | |
3373 | } | |
3374 | ||
3375 | /* Output a conditional branch. */ | |
3376 | static void | |
3377 | output_cbranch (nios2_insn_infoS *insn) | |
3378 | { | |
3379 | nios2_insn_relocS *reloc = insn->insn_reloc; | |
3380 | ||
3381 | /* If the reloc is NULL, there was an error assembling the branch. */ | |
3382 | if (reloc != NULL) | |
3383 | { | |
3384 | symbolS *symp = reloc->reloc_expression.X_add_symbol; | |
3385 | offsetT offset = reloc->reloc_expression.X_add_number; | |
3386 | char *f; | |
c8c8175b | 3387 | bfd_boolean is_cdx = (insn->insn_nios2_opcode->size == 2); |
36591ba1 SL |
3388 | |
3389 | /* Tag dwarf2 debug info to the address at the start of the insn. | |
3390 | We must do it before frag_var() below closes off the frag. */ | |
3391 | dwarf2_emit_insn (0); | |
3392 | ||
3393 | /* We create a machine dependent frag which can grow | |
3394 | to accommodate the largest possible instruction sequence | |
3395 | this may generate. */ | |
3396 | f = frag_var (rs_machine_dependent, | |
96ba4233 | 3397 | CBRANCH_MAX_SIZE, insn->insn_nios2_opcode->size, |
c8c8175b SL |
3398 | (is_cdx ? CDX_CBRANCH_SUBTYPE (0) : CBRANCH_SUBTYPE (0)), |
3399 | symp, offset, NULL); | |
36591ba1 | 3400 | |
96ba4233 | 3401 | md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size); |
36591ba1 SL |
3402 | |
3403 | /* We leave fixup generation to md_convert_frag. */ | |
3404 | } | |
3405 | } | |
3406 | ||
3407 | /* Output a call sequence. Since calls are not pc-relative for NIOS2, | |
3408 | but are page-relative, we cannot tell at any stage in assembly | |
3409 | whether a call will be out of range since a section may be linked | |
3410 | at any address. So if we are relaxing, we convert all call instructions | |
3411 | to long call sequences, and rely on the linker to relax them back to | |
3412 | short calls. */ | |
3413 | static void | |
3414 | output_call (nios2_insn_infoS *insn) | |
3415 | { | |
3416 | /* This allocates enough space for the instruction | |
3417 | and puts it in the current frag. */ | |
3418 | char *f = frag_more (12); | |
3419 | nios2_insn_relocS *reloc = insn->insn_reloc; | |
c8c8175b | 3420 | const struct nios2_opcode *op = insn->insn_nios2_opcode; |
36591ba1 | 3421 | |
c8c8175b SL |
3422 | switch (op->format) |
3423 | { | |
3424 | case iw_j_type: | |
3425 | md_number_to_chars (f, | |
3426 | (MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM) | |
3427 | | SET_IW_I_A (0)), | |
3428 | 4); | |
3429 | dwarf2_emit_insn (4); | |
3430 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, | |
3431 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_HI16); | |
3432 | md_number_to_chars (f + 4, | |
3433 | (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM) | |
3434 | | SET_IW_I_A (AT_REGNUM)), | |
3435 | 4); | |
3436 | dwarf2_emit_insn (4); | |
3437 | fix_new_exp (frag_now, f - frag_now->fr_literal + 4, 4, | |
3438 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_LO16); | |
3439 | md_number_to_chars (f + 8, MATCH_R1_CALLR | SET_IW_R_A (AT_REGNUM), 4); | |
3440 | dwarf2_emit_insn (4); | |
3441 | break; | |
3442 | case iw_L26_type: | |
3443 | md_number_to_chars (f, | |
3444 | (MATCH_R2_ORHI | SET_IW_F2I16_B (AT_REGNUM) | |
3445 | | SET_IW_F2I16_A (0)), | |
3446 | 4); | |
3447 | dwarf2_emit_insn (4); | |
3448 | fix_new_exp (frag_now, f - frag_now->fr_literal, 4, | |
3449 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_HI16); | |
3450 | md_number_to_chars (f + 4, | |
3451 | (MATCH_R2_ORI | SET_IW_F2I16_B (AT_REGNUM) | |
3452 | | SET_IW_F2I16_A (AT_REGNUM)), | |
3453 | 4); | |
3454 | dwarf2_emit_insn (4); | |
3455 | fix_new_exp (frag_now, f - frag_now->fr_literal + 4, 4, | |
3456 | &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_LO16); | |
3457 | md_number_to_chars (f + 8, MATCH_R2_CALLR | SET_IW_F3X6L5_A (AT_REGNUM), | |
3458 | 4); | |
3459 | dwarf2_emit_insn (4); | |
3460 | break; | |
3461 | default: | |
3462 | bad_opcode (op); | |
3463 | } | |
36591ba1 SL |
3464 | } |
3465 | ||
36591ba1 SL |
3466 | /* Output a movhi/addi pair for the movia pseudo-op. */ |
3467 | static void | |
3468 | output_movia (nios2_insn_infoS *insn) | |
3469 | { | |
3470 | /* This allocates enough space for the instruction | |
3471 | and puts it in the current frag. */ | |
3472 | char *f = frag_more (8); | |
3473 | nios2_insn_relocS *reloc = insn->insn_reloc; | |
c8c8175b SL |
3474 | unsigned long reg, code; |
3475 | const struct nios2_opcode *op = insn->insn_nios2_opcode; | |
36591ba1 SL |
3476 | |
3477 | /* If the reloc is NULL, there was an error assembling the movia. */ | |
3478 | if (reloc != NULL) | |
3479 | { | |
c8c8175b SL |
3480 | switch (op->format) |
3481 | { | |
3482 | case iw_i_type: | |
3483 | reg = GET_IW_I_B (insn->insn_code); | |
3484 | code = MATCH_R1_ADDI | SET_IW_I_A (reg) | SET_IW_I_B (reg); | |
3485 | break; | |
3486 | case iw_F2I16_type: | |
3487 | reg = GET_IW_F2I16_B (insn->insn_code); | |
3488 | code = MATCH_R2_ADDI | SET_IW_F2I16_A (reg) | SET_IW_F2I16_B (reg); | |
3489 | break; | |
3490 | default: | |
3491 | bad_opcode (op); | |
3492 | } | |
3493 | ||
36591ba1 SL |
3494 | md_number_to_chars (f, insn->insn_code, 4); |
3495 | dwarf2_emit_insn (4); | |
36591ba1 SL |
3496 | fix_new (frag_now, f - frag_now->fr_literal, 4, |
3497 | reloc->reloc_expression.X_add_symbol, | |
3498 | reloc->reloc_expression.X_add_number, 0, | |
3499 | BFD_RELOC_NIOS2_HIADJ16); | |
c8c8175b | 3500 | md_number_to_chars (f + 4, code, 4); |
96ba4233 | 3501 | dwarf2_emit_insn (4); |
36591ba1 SL |
3502 | fix_new (frag_now, f + 4 - frag_now->fr_literal, 4, |
3503 | reloc->reloc_expression.X_add_symbol, | |
3504 | reloc->reloc_expression.X_add_number, 0, BFD_RELOC_NIOS2_LO16); | |
3505 | } | |
3506 | } | |
3507 | ||
3508 | ||
3509 | \f | |
3510 | /** External interfaces. */ | |
3511 | ||
965b1d80 SL |
3512 | /* Update the selected architecture based on ARCH, giving an error if |
3513 | ARCH is an invalid value. */ | |
3514 | ||
3515 | static void | |
3516 | nios2_use_arch (const char *arch) | |
3517 | { | |
3518 | if (strcmp (arch, "nios2") == 0 || strcmp (arch, "r1") == 0) | |
3519 | { | |
3520 | nios2_architecture |= EF_NIOS2_ARCH_R1; | |
3521 | nios2_opcodes = (struct nios2_opcode *) nios2_r1_opcodes; | |
3522 | nios2_num_opcodes = nios2_num_r1_opcodes; | |
3523 | nop32 = nop_r1; | |
3524 | nop16 = NULL; | |
3525 | return; | |
3526 | } | |
3527 | else if (strcmp (arch, "r2") == 0) | |
3528 | { | |
3529 | nios2_architecture |= EF_NIOS2_ARCH_R2; | |
3530 | nios2_opcodes = (struct nios2_opcode *) nios2_r2_opcodes; | |
3531 | nios2_num_opcodes = nios2_num_r2_opcodes; | |
3532 | nop32 = nop_r2; | |
3533 | nop16 = nop_r2_cdx; | |
3534 | return; | |
3535 | } | |
3536 | ||
3537 | as_bad (_("unknown architecture '%s'"), arch); | |
3538 | } | |
3539 | ||
36591ba1 SL |
3540 | /* The following functions are called by machine-independent parts of |
3541 | the assembler. */ | |
3542 | int | |
3543 | md_parse_option (int c, char *arg ATTRIBUTE_UNUSED) | |
3544 | { | |
3545 | switch (c) | |
3546 | { | |
3547 | case 'r': | |
3548 | /* Hidden option for self-test mode. */ | |
3549 | nios2_mode = NIOS2_MODE_TEST; | |
3550 | break; | |
3551 | case OPTION_RELAX_ALL: | |
3552 | nios2_as_options.relax = relax_all; | |
3553 | break; | |
3554 | case OPTION_NORELAX: | |
3555 | nios2_as_options.relax = relax_none; | |
3556 | break; | |
3557 | case OPTION_RELAX_SECTION: | |
3558 | nios2_as_options.relax = relax_section; | |
3559 | break; | |
3560 | case OPTION_EB: | |
3561 | target_big_endian = 1; | |
3562 | break; | |
3563 | case OPTION_EL: | |
3564 | target_big_endian = 0; | |
3565 | break; | |
965b1d80 SL |
3566 | case OPTION_MARCH: |
3567 | nios2_use_arch (arg); | |
3568 | break; | |
36591ba1 SL |
3569 | default: |
3570 | return 0; | |
3571 | break; | |
3572 | } | |
3573 | ||
3574 | return 1; | |
3575 | } | |
3576 | ||
3577 | /* Implement TARGET_FORMAT. We can choose to be big-endian or | |
3578 | little-endian at runtime based on a switch. */ | |
3579 | const char * | |
3580 | nios2_target_format (void) | |
3581 | { | |
3582 | return target_big_endian ? "elf32-bignios2" : "elf32-littlenios2"; | |
3583 | } | |
3584 | ||
3585 | /* Machine-dependent usage message. */ | |
3586 | void | |
3587 | md_show_usage (FILE *stream) | |
3588 | { | |
3589 | fprintf (stream, " NIOS2 options:\n" | |
3590 | " -relax-all replace all branch and call " | |
3591 | "instructions with jmp and callr sequences\n" | |
3592 | " -relax-section replace identified out of range " | |
3593 | "branches with jmp sequences (default)\n" | |
3594 | " -no-relax do not replace any branches or calls\n" | |
3595 | " -EB force big-endian byte ordering\n" | |
965b1d80 SL |
3596 | " -EL force little-endian byte ordering\n" |
3597 | " -march=ARCH enable instructions from architecture ARCH\n"); | |
36591ba1 SL |
3598 | } |
3599 | ||
965b1d80 | 3600 | |
36591ba1 SL |
3601 | /* This function is called once, at assembler startup time. |
3602 | It should set up all the tables, etc. that the MD part of the | |
3603 | assembler will need. */ | |
3604 | void | |
3605 | md_begin (void) | |
3606 | { | |
3607 | int i; | |
3608 | const char *inserted; | |
3609 | ||
965b1d80 SL |
3610 | switch (nios2_architecture) |
3611 | { | |
3612 | default: | |
3613 | case EF_NIOS2_ARCH_R1: | |
3614 | bfd_default_set_arch_mach (stdoutput, bfd_arch_nios2, bfd_mach_nios2r1); | |
3615 | break; | |
3616 | case EF_NIOS2_ARCH_R2: | |
3617 | if (target_big_endian) | |
3618 | as_fatal (_("Big-endian R2 is not supported.")); | |
3619 | bfd_default_set_arch_mach (stdoutput, bfd_arch_nios2, bfd_mach_nios2r2); | |
3620 | break; | |
3621 | } | |
3622 | ||
3739860c | 3623 | /* Create and fill a hashtable for the Nios II opcodes, registers and |
36591ba1 SL |
3624 | arguments. */ |
3625 | nios2_opcode_hash = hash_new (); | |
3626 | nios2_reg_hash = hash_new (); | |
36591ba1 SL |
3627 | nios2_ps_hash = hash_new (); |
3628 | ||
96ba4233 | 3629 | for (i = 0; i < nios2_num_opcodes; ++i) |
36591ba1 SL |
3630 | { |
3631 | inserted | |
3632 | = hash_insert (nios2_opcode_hash, nios2_opcodes[i].name, | |
3633 | (PTR) & nios2_opcodes[i]); | |
3634 | if (inserted != NULL) | |
3635 | { | |
3636 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), | |
3637 | nios2_opcodes[i].name, inserted); | |
3638 | /* Probably a memory allocation problem? Give up now. */ | |
3639 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
3640 | } | |
3641 | } | |
3642 | ||
3643 | for (i = 0; i < nios2_num_regs; ++i) | |
3644 | { | |
3645 | inserted | |
3646 | = hash_insert (nios2_reg_hash, nios2_regs[i].name, | |
3647 | (PTR) & nios2_regs[i]); | |
3648 | if (inserted != NULL) | |
3649 | { | |
3650 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), | |
3651 | nios2_regs[i].name, inserted); | |
3652 | /* Probably a memory allocation problem? Give up now. */ | |
3653 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
3654 | } | |
3655 | ||
3656 | } | |
3657 | ||
36591ba1 SL |
3658 | for (i = 0; i < nios2_num_ps_insn_info_structs; ++i) |
3659 | { | |
3660 | inserted | |
3661 | = hash_insert (nios2_ps_hash, nios2_ps_insn_info_structs[i].pseudo_insn, | |
3662 | (PTR) & nios2_ps_insn_info_structs[i]); | |
3663 | if (inserted != NULL) | |
3664 | { | |
3665 | fprintf (stderr, _("internal error: can't hash `%s': %s\n"), | |
3666 | nios2_ps_insn_info_structs[i].pseudo_insn, inserted); | |
3667 | /* Probably a memory allocation problem? Give up now. */ | |
3668 | as_fatal (_("Broken assembler. No assembly attempted.")); | |
3669 | } | |
3670 | } | |
3671 | ||
3672 | /* Assembler option defaults. */ | |
3673 | nios2_as_options.noat = FALSE; | |
3674 | nios2_as_options.nobreak = FALSE; | |
3675 | ||
3676 | /* Debug information is incompatible with relaxation. */ | |
3677 | if (debug_type != DEBUG_UNSPECIFIED) | |
3678 | nios2_as_options.relax = relax_none; | |
3679 | ||
3680 | /* Initialize the alignment data. */ | |
3681 | nios2_current_align_seg = now_seg; | |
3682 | nios2_last_label = NULL; | |
3683 | nios2_current_align = 0; | |
c8c8175b | 3684 | nios2_min_align = 2; |
36591ba1 SL |
3685 | } |
3686 | ||
3687 | ||
3688 | /* Assembles a single line of Nios II assembly language. */ | |
3689 | void | |
3690 | md_assemble (char *op_str) | |
3691 | { | |
3739860c | 3692 | char *argstr; |
36591ba1 | 3693 | char *op_strdup = NULL; |
36591ba1 SL |
3694 | unsigned long saved_pinfo = 0; |
3695 | nios2_insn_infoS thisinsn; | |
3696 | nios2_insn_infoS *insn = &thisinsn; | |
3697 | ||
c8c8175b SL |
3698 | /* Make sure we are aligned on an appropriate boundary. */ |
3699 | if (nios2_current_align < nios2_min_align) | |
3700 | nios2_align (nios2_min_align, NULL, nios2_last_label); | |
3701 | else if (nios2_current_align > nios2_min_align) | |
3702 | nios2_current_align = nios2_min_align; | |
36591ba1 SL |
3703 | nios2_last_label = NULL; |
3704 | ||
3705 | /* We don't want to clobber to op_str | |
3706 | because we want to be able to use it in messages. */ | |
3707 | op_strdup = strdup (op_str); | |
3708 | insn->insn_tokens[0] = strtok (op_strdup, " "); | |
3709 | argstr = strtok (NULL, ""); | |
3710 | ||
3711 | /* Assemble the opcode. */ | |
3712 | insn->insn_nios2_opcode = nios2_opcode_lookup (insn->insn_tokens[0]); | |
3713 | insn->insn_reloc = NULL; | |
3714 | ||
3715 | if (insn->insn_nios2_opcode != NULL) | |
3716 | { | |
3717 | nios2_ps_insn_infoS *ps_insn = NULL; | |
c8c8175b SL |
3718 | |
3719 | /* Note if we've seen a 16-bit instruction. */ | |
3720 | if (insn->insn_nios2_opcode->size == 2) | |
3721 | nios2_min_align = 1; | |
3722 | ||
36591ba1 SL |
3723 | /* Set the opcode for the instruction. */ |
3724 | insn->insn_code = insn->insn_nios2_opcode->match; | |
96ba4233 | 3725 | insn->constant_bits = 0; |
36591ba1 SL |
3726 | |
3727 | /* Parse the arguments pointed to by argstr. */ | |
3728 | if (nios2_mode == NIOS2_MODE_ASSEMBLE) | |
3729 | nios2_parse_args (insn, argstr, insn->insn_nios2_opcode->args, | |
3730 | (char **) &insn->insn_tokens[1]); | |
3731 | else | |
3732 | nios2_parse_args (insn, argstr, insn->insn_nios2_opcode->args_test, | |
3733 | (char **) &insn->insn_tokens[1]); | |
3734 | ||
3739860c | 3735 | /* We need to preserve the MOVIA macro as this is clobbered by |
36591ba1 SL |
3736 | translate_pseudo_insn. */ |
3737 | if (insn->insn_nios2_opcode->pinfo == NIOS2_INSN_MACRO_MOVIA) | |
3738 | saved_pinfo = NIOS2_INSN_MACRO_MOVIA; | |
3739860c | 3739 | /* If the instruction is an pseudo-instruction, we want to replace it |
36591ba1 SL |
3740 | with its real equivalent, and then continue. */ |
3741 | if ((insn->insn_nios2_opcode->pinfo & NIOS2_INSN_MACRO) | |
3742 | == NIOS2_INSN_MACRO) | |
3743 | ps_insn = nios2_translate_pseudo_insn (insn); | |
3744 | ||
96ba4233 SL |
3745 | /* Assemble the parsed arguments into the instruction word. */ |
3746 | nios2_assemble_args (insn); | |
3747 | ||
3748 | /* Handle relaxation and other transformations. */ | |
3749 | if (nios2_as_options.relax != relax_none | |
3750 | && !nios2_as_options.noat | |
3751 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_UBRANCH) | |
3752 | output_ubranch (insn); | |
3753 | else if (nios2_as_options.relax != relax_none | |
3754 | && !nios2_as_options.noat | |
3755 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_CBRANCH) | |
3756 | output_cbranch (insn); | |
3757 | else if (nios2_as_options.relax == relax_all | |
3758 | && !nios2_as_options.noat | |
3759 | && insn->insn_nios2_opcode->pinfo & NIOS2_INSN_CALL | |
3760 | && insn->insn_reloc | |
3761 | && ((insn->insn_reloc->reloc_type | |
3762 | == BFD_RELOC_NIOS2_CALL26) | |
3763 | || (insn->insn_reloc->reloc_type | |
3764 | == BFD_RELOC_NIOS2_CALL26_NOAT))) | |
3765 | output_call (insn); | |
96ba4233 SL |
3766 | else if (saved_pinfo == NIOS2_INSN_MACRO_MOVIA) |
3767 | output_movia (insn); | |
36591ba1 | 3768 | else |
96ba4233 SL |
3769 | output_insn (insn); |
3770 | if (ps_insn) | |
3771 | nios2_cleanup_pseudo_insn (insn, ps_insn); | |
36591ba1 SL |
3772 | } |
3773 | else | |
3774 | /* Unrecognised instruction - error. */ | |
3775 | as_bad (_("unrecognised instruction %s"), insn->insn_tokens[0]); | |
3776 | ||
3777 | /* Don't leak memory. */ | |
3778 | free (op_strdup); | |
3779 | } | |
3780 | ||
3781 | /* Round up section size. */ | |
3782 | valueT | |
3783 | md_section_align (asection *seg ATTRIBUTE_UNUSED, valueT size) | |
3784 | { | |
3785 | /* I think byte alignment is fine here. */ | |
3786 | return size; | |
3787 | } | |
3788 | ||
3789 | /* Implement TC_FORCE_RELOCATION. */ | |
3790 | int | |
3791 | nios2_force_relocation (fixS *fixp) | |
3792 | { | |
3793 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT | |
3794 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY | |
3795 | || fixp->fx_r_type == BFD_RELOC_NIOS2_ALIGN) | |
3796 | return 1; | |
3797 | ||
3798 | return generic_force_reloc (fixp); | |
3799 | } | |
3800 | ||
3801 | /* Implement tc_fix_adjustable. */ | |
3802 | int | |
3803 | nios2_fix_adjustable (fixS *fixp) | |
3804 | { | |
3805 | if (fixp->fx_addsy == NULL) | |
3806 | return 1; | |
3807 | ||
3808 | #ifdef OBJ_ELF | |
3809 | /* Prevent all adjustments to global symbols. */ | |
3810 | if (OUTPUT_FLAVOR == bfd_target_elf_flavour | |
3811 | && (S_IS_EXTERNAL (fixp->fx_addsy) || S_IS_WEAK (fixp->fx_addsy))) | |
3812 | return 0; | |
3813 | #endif | |
3814 | if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT | |
3815 | || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) | |
3816 | return 0; | |
3817 | ||
3818 | /* Preserve relocations against symbols with function type. */ | |
3819 | if (symbol_get_bfdsym (fixp->fx_addsy)->flags & BSF_FUNCTION) | |
3820 | return 0; | |
3821 | ||
3822 | /* Don't allow symbols to be discarded on GOT related relocs. */ | |
3823 | if (fixp->fx_r_type == BFD_RELOC_NIOS2_GOT16 | |
3824 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL16 | |
3825 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_LO | |
3826 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF_HA | |
3827 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_GD16 | |
3828 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LDM16 | |
3829 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LDO16 | |
3830 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_IE16 | |
3831 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_LE16 | |
3832 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPMOD | |
3833 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_DTPREL | |
3834 | || fixp->fx_r_type == BFD_RELOC_NIOS2_TLS_TPREL | |
1c2de463 SL |
3835 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOTOFF |
3836 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOT_LO | |
3837 | || fixp->fx_r_type == BFD_RELOC_NIOS2_GOT_HA | |
3838 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL_LO | |
3839 | || fixp->fx_r_type == BFD_RELOC_NIOS2_CALL_HA | |
3840 | ) | |
36591ba1 SL |
3841 | return 0; |
3842 | ||
3843 | return 1; | |
3844 | } | |
3845 | ||
3846 | /* Implement tc_frob_symbol. This is called in adjust_reloc_syms; | |
3847 | it is used to remove *ABS* references from the symbol table. */ | |
3848 | int | |
3849 | nios2_frob_symbol (symbolS *symp) | |
3850 | { | |
3851 | if ((OUTPUT_FLAVOR == bfd_target_elf_flavour | |
3852 | && symp == section_symbol (absolute_section)) | |
3853 | || !S_IS_DEFINED (symp)) | |
3854 | return 1; | |
3855 | else | |
3856 | return 0; | |
3857 | } | |
3858 | ||
3859 | /* The function tc_gen_reloc creates a relocation structure for the | |
3860 | fixup fixp, and returns a pointer to it. This structure is passed | |
3861 | to bfd_install_relocation so that it can be written to the object | |
3862 | file for linking. */ | |
3863 | arelent * | |
3864 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) | |
3865 | { | |
3866 | arelent *reloc = (arelent *) xmalloc (sizeof (arelent)); | |
3867 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); | |
3868 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); | |
3869 | ||
3870 | reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; | |
3871 | reloc->addend = fixp->fx_offset; /* fixp->fx_addnumber; */ | |
3872 | ||
3873 | if (fixp->fx_pcrel) | |
3874 | { | |
3875 | switch (fixp->fx_r_type) | |
3876 | { | |
3877 | case BFD_RELOC_16: | |
3878 | fixp->fx_r_type = BFD_RELOC_16_PCREL; | |
3879 | break; | |
3880 | case BFD_RELOC_NIOS2_LO16: | |
3881 | fixp->fx_r_type = BFD_RELOC_NIOS2_PCREL_LO; | |
3882 | break; | |
3883 | case BFD_RELOC_NIOS2_HIADJ16: | |
3884 | fixp->fx_r_type = BFD_RELOC_NIOS2_PCREL_HA; | |
3885 | break; | |
3886 | default: | |
3887 | break; | |
3888 | } | |
3889 | } | |
3890 | ||
3891 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); | |
3892 | if (reloc->howto == NULL) | |
3893 | { | |
3894 | as_bad_where (fixp->fx_file, fixp->fx_line, | |
3895 | _("can't represent relocation type %s"), | |
3896 | bfd_get_reloc_code_name (fixp->fx_r_type)); | |
3897 | ||
3898 | /* Set howto to a garbage value so that we can keep going. */ | |
3899 | reloc->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_32); | |
3900 | gas_assert (reloc->howto != NULL); | |
3901 | } | |
3902 | return reloc; | |
3903 | } | |
3904 | ||
3905 | long | |
3906 | md_pcrel_from (fixS *fixP ATTRIBUTE_UNUSED) | |
3907 | { | |
3908 | return 0; | |
3909 | } | |
3910 | ||
3911 | /* Called just before the assembler exits. */ | |
3912 | void | |
3913 | md_end () | |
3914 | { | |
3915 | /* FIXME - not yet implemented */ | |
3916 | } | |
3917 | ||
3918 | /* Under ELF we need to default _GLOBAL_OFFSET_TABLE. | |
3919 | Otherwise we have no need to default values of symbols. */ | |
3920 | symbolS * | |
3921 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) | |
3922 | { | |
3923 | #ifdef OBJ_ELF | |
3924 | if (name[0] == '_' && name[1] == 'G' | |
3925 | && strcmp (name, GLOBAL_OFFSET_TABLE_NAME) == 0) | |
3926 | { | |
3927 | if (!GOT_symbol) | |
3928 | { | |
3929 | if (symbol_find (name)) | |
3930 | as_bad ("GOT already in the symbol table"); | |
3931 | ||
3932 | GOT_symbol = symbol_new (name, undefined_section, | |
3933 | (valueT) 0, &zero_address_frag); | |
3934 | } | |
3935 | ||
3936 | return GOT_symbol; | |
3937 | } | |
3938 | #endif | |
3939 | ||
3940 | return 0; | |
3941 | } | |
3942 | ||
3943 | /* Implement tc_frob_label. */ | |
3944 | void | |
3945 | nios2_frob_label (symbolS *lab) | |
3946 | { | |
3947 | /* Emit dwarf information. */ | |
3948 | dwarf2_emit_label (lab); | |
3949 | ||
3950 | /* Update the label's address with the current output pointer. */ | |
3951 | symbol_set_frag (lab, frag_now); | |
3952 | S_SET_VALUE (lab, (valueT) frag_now_fix ()); | |
3953 | ||
3954 | /* Record this label for future adjustment after we find out what | |
3955 | kind of data it references, and the required alignment therewith. */ | |
3956 | nios2_last_label = lab; | |
3957 | } | |
3958 | ||
3959 | /* Implement md_cons_align. */ | |
3960 | void | |
3961 | nios2_cons_align (int size) | |
3962 | { | |
3963 | int log_size = 0; | |
3964 | const char *pfill = NULL; | |
3965 | ||
3966 | while ((size >>= 1) != 0) | |
3967 | ++log_size; | |
3968 | ||
3969 | if (subseg_text_p (now_seg)) | |
c8c8175b | 3970 | pfill = (const char *) nop32; |
36591ba1 SL |
3971 | else |
3972 | pfill = NULL; | |
3973 | ||
3974 | if (nios2_auto_align_on) | |
3975 | nios2_align (log_size, pfill, NULL); | |
3976 | ||
3977 | nios2_last_label = NULL; | |
3978 | } | |
3979 | ||
3980 | /* Map 's' to SHF_NIOS2_GPREL. */ | |
3981 | /* This is from the Alpha code tc-alpha.c. */ | |
3982 | int | |
3983 | nios2_elf_section_letter (int letter, char **ptr_msg) | |
3984 | { | |
3985 | if (letter == 's') | |
3986 | return SHF_NIOS2_GPREL; | |
3987 | ||
3988 | *ptr_msg = _("Bad .section directive: want a,s,w,x,M,S,G,T in string"); | |
3989 | return -1; | |
3990 | } | |
3991 | ||
3992 | /* Map SHF_ALPHA_GPREL to SEC_SMALL_DATA. */ | |
3993 | /* This is from the Alpha code tc-alpha.c. */ | |
3994 | flagword | |
3995 | nios2_elf_section_flags (flagword flags, int attr, int type ATTRIBUTE_UNUSED) | |
3996 | { | |
3997 | if (attr & SHF_NIOS2_GPREL) | |
3998 | flags |= SEC_SMALL_DATA; | |
3999 | return flags; | |
4000 | } | |
4001 | ||
4002 | /* Implement TC_PARSE_CONS_EXPRESSION to handle %tls_ldo(...) */ | |
62ebcb5c | 4003 | bfd_reloc_code_real_type |
36591ba1 SL |
4004 | nios2_cons (expressionS *exp, int size) |
4005 | { | |
62ebcb5c | 4006 | bfd_reloc_code_real_type nios2_tls_ldo_reloc = BFD_RELOC_NONE; |
36591ba1 SL |
4007 | |
4008 | SKIP_WHITESPACE (); | |
4009 | if (input_line_pointer[0] == '%') | |
4010 | { | |
4011 | if (strprefix (input_line_pointer + 1, "tls_ldo")) | |
4012 | { | |
4013 | if (size != 4) | |
4014 | as_bad (_("Illegal operands: %%tls_ldo in %d-byte data field"), | |
4015 | size); | |
4016 | else | |
4017 | { | |
4018 | input_line_pointer += 8; | |
62ebcb5c | 4019 | nios2_tls_ldo_reloc = BFD_RELOC_NIOS2_TLS_DTPREL; |
36591ba1 SL |
4020 | } |
4021 | } | |
62ebcb5c | 4022 | if (nios2_tls_ldo_reloc != BFD_RELOC_NONE) |
36591ba1 SL |
4023 | { |
4024 | SKIP_WHITESPACE (); | |
4025 | if (input_line_pointer[0] != '(') | |
4026 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); | |
4027 | else | |
4028 | { | |
4029 | int c; | |
4030 | char *end = ++input_line_pointer; | |
4031 | int npar = 0; | |
4032 | ||
4033 | for (c = *end; !is_end_of_line[c]; end++, c = *end) | |
4034 | if (c == '(') | |
4035 | npar++; | |
4036 | else if (c == ')') | |
4037 | { | |
4038 | if (!npar) | |
4039 | break; | |
4040 | npar--; | |
4041 | } | |
4042 | ||
4043 | if (c != ')') | |
4044 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); | |
4045 | else | |
4046 | { | |
4047 | *end = '\0'; | |
4048 | expression (exp); | |
4049 | *end = c; | |
4050 | if (input_line_pointer != end) | |
4051 | as_bad (_("Illegal operands: %%tls_ldo requires arguments in ()")); | |
4052 | else | |
4053 | { | |
4054 | input_line_pointer++; | |
4055 | SKIP_WHITESPACE (); | |
4056 | c = *input_line_pointer; | |
4057 | if (! is_end_of_line[c] && c != ',') | |
4058 | as_bad (_("Illegal operands: garbage after %%tls_ldo()")); | |
4059 | } | |
4060 | } | |
4061 | } | |
4062 | } | |
4063 | } | |
62ebcb5c | 4064 | if (nios2_tls_ldo_reloc == BFD_RELOC_NONE) |
36591ba1 | 4065 | expression (exp); |
62ebcb5c | 4066 | return nios2_tls_ldo_reloc; |
36591ba1 SL |
4067 | } |
4068 | ||
4069 | /* Implement HANDLE_ALIGN. */ | |
4070 | void | |
4071 | nios2_handle_align (fragS *fragp) | |
4072 | { | |
4073 | /* If we are expecting to relax in the linker, then we must output a | |
4074 | relocation to tell the linker we are aligning code. */ | |
4075 | if (nios2_as_options.relax == relax_all | |
4076 | && (fragp->fr_type == rs_align || fragp->fr_type == rs_align_code) | |
4077 | && fragp->fr_address + fragp->fr_fix > 0 | |
4078 | && fragp->fr_offset > 1 | |
4079 | && now_seg != bss_section) | |
4080 | fix_new (fragp, fragp->fr_fix, 0, &abs_symbol, fragp->fr_offset, 0, | |
4081 | BFD_RELOC_NIOS2_ALIGN); | |
4082 | } | |
4083 | ||
4084 | /* Implement tc_regname_to_dw2regnum, to convert REGNAME to a DWARF-2 | |
4085 | register number. */ | |
4086 | int | |
4087 | nios2_regname_to_dw2regnum (char *regname) | |
4088 | { | |
4089 | struct nios2_reg *r = nios2_reg_lookup (regname); | |
4090 | if (r == NULL) | |
4091 | return -1; | |
4092 | return r->index; | |
4093 | } | |
4094 | ||
4095 | /* Implement tc_cfi_frame_initial_instructions, to initialize the DWARF-2 | |
4096 | unwind information for this procedure. */ | |
4097 | void | |
4098 | nios2_frame_initial_instructions (void) | |
4099 | { | |
4100 | cfi_add_CFA_def_cfa (27, 0); | |
4101 | } | |
965b1d80 SL |
4102 | |
4103 | #ifdef OBJ_ELF | |
4104 | /* Some special processing for a Nios II ELF file. */ | |
4105 | ||
4106 | void | |
4107 | nios2_elf_final_processing (void) | |
4108 | { | |
4109 | elf_elfheader (stdoutput)->e_flags = nios2_architecture; | |
4110 | } | |
4111 | #endif |