Commit | Line | Data |
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252b5132 | 1 | /* GAS interface for targets using CGEN: Cpu tools GENerator. |
f7e42eb4 NC |
2 | Copyright 1996, 1997, 1998, 1999, 2000, 2001 |
3 | Free Software Foundation, Inc. | |
252b5132 RH |
4 | |
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GAS is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GAS; see the file COPYING. If not, write to the Free Software | |
542d6675 | 19 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
252b5132 RH |
20 | |
21 | #include <setjmp.h> | |
22 | #include "ansidecl.h" | |
23 | #include "libiberty.h" | |
24 | #include "bfd.h" | |
25 | #include "symcat.h" | |
26 | #include "cgen-desc.h" | |
27 | #include "as.h" | |
28 | #include "subsegs.h" | |
29 | #include "cgen.h" | |
272d76e0 | 30 | #include "dwarf2dbg.h" |
252b5132 RH |
31 | |
32 | /* Opcode table descriptor, must be set by md_begin. */ | |
33 | ||
34 | CGEN_CPU_DESC gas_cgen_cpu_desc; | |
35 | ||
36 | /* Callback to insert a register into the symbol table. | |
37 | A target may choose to let GAS parse the registers. | |
38 | ??? Not currently used. */ | |
39 | ||
40 | void | |
41 | cgen_asm_record_register (name, number) | |
542d6675 | 42 | char *name; |
252b5132 RH |
43 | int number; |
44 | { | |
45 | /* Use symbol_create here instead of symbol_new so we don't try to | |
46 | output registers into the object file's symbol table. */ | |
47 | symbol_table_insert (symbol_create (name, reg_section, | |
542d6675 | 48 | number, &zero_address_frag)); |
252b5132 RH |
49 | } |
50 | ||
51 | /* We need to keep a list of fixups. We can't simply generate them as | |
52 | we go, because that would require us to first create the frag, and | |
53 | that would screw up references to ``.''. | |
54 | ||
55 | This is used by cpu's with simple operands. It keeps knowledge of what | |
56 | an `expressionS' is and what a `fixup' is out of CGEN which for the time | |
57 | being is preferable. | |
58 | ||
59 | OPINDEX is the index in the operand table. | |
60 | OPINFO is something the caller chooses to help in reloc determination. */ | |
61 | ||
30a2b4ef | 62 | struct fixup { |
252b5132 RH |
63 | int opindex; |
64 | int opinfo; | |
65 | expressionS exp; | |
66 | }; | |
67 | ||
542d6675 | 68 | static struct fixup fixups[GAS_CGEN_MAX_FIXUPS]; |
252b5132 RH |
69 | static int num_fixups; |
70 | ||
71 | /* Prepare to parse an instruction. | |
72 | ??? May wish to make this static and delete calls in md_assemble. */ | |
73 | ||
74 | void | |
75 | gas_cgen_init_parse () | |
76 | { | |
77 | num_fixups = 0; | |
78 | } | |
79 | ||
80 | /* Queue a fixup. */ | |
81 | ||
82 | static void | |
83 | queue_fixup (opindex, opinfo, expP) | |
84 | int opindex; | |
eabed1c0 | 85 | int opinfo; |
252b5132 RH |
86 | expressionS * expP; |
87 | { | |
88 | /* We need to generate a fixup for this expression. */ | |
89 | if (num_fixups >= GAS_CGEN_MAX_FIXUPS) | |
90 | as_fatal (_("too many fixups")); | |
30a2b4ef | 91 | fixups[num_fixups].exp = *expP; |
252b5132 RH |
92 | fixups[num_fixups].opindex = opindex; |
93 | fixups[num_fixups].opinfo = opinfo; | |
94 | ++ num_fixups; | |
95 | } | |
96 | ||
002de68b JH |
97 | /* The following functions allow fixup chains to be stored, retrieved, |
98 | and swapped. They are a generalization of a pre-existing scheme | |
99 | for storing, restoring and swapping fixup chains that was used by | |
100 | the m32r port. The functionality is essentially the same, only | |
101 | instead of only being able to store a single fixup chain, an entire | |
102 | array of fixup chains can be stored. It is the user's responsibility | |
103 | to keep track of how many fixup chains have been stored and which | |
104 | elements of the array they are in. | |
105 | ||
106 | The algorithms used are the same as in the old scheme. Other than the | |
107 | "array-ness" of the whole thing, the functionality is identical to the | |
108 | old scheme. | |
109 | ||
110 | gas_cgen_initialize_saved_fixups_array(): | |
111 | Sets num_fixups_in_chain to 0 for each element. Call this from | |
112 | md_begin() if you plan to use these functions and you want the | |
113 | fixup count in each element to be set to 0 intially. This is | |
114 | not necessary, but it's included just in case. It performs | |
115 | the same function for each element in the array of fixup chains | |
116 | that gas_init_parse() performs for the current fixups. | |
117 | ||
118 | gas_cgen_save_fixups (element): | |
119 | element - element number of the array you wish to store the fixups | |
120 | to. No mechanism is built in for tracking what element | |
121 | was last stored to. | |
122 | ||
123 | gas_cgen_restore_fixups (element): | |
124 | element - element number of the array you wish to restore the fixups | |
125 | from. | |
126 | ||
127 | gas_cgen_swap_fixups(int element): | |
128 | element - swap the current fixups with those in this element number. | |
129 | */ | |
130 | ||
131 | struct saved_fixups { | |
132 | struct fixup fixup_chain[GAS_CGEN_MAX_FIXUPS]; | |
133 | int num_fixups_in_chain; | |
134 | }; | |
252b5132 | 135 | |
002de68b | 136 | static struct saved_fixups stored_fixups[MAX_SAVED_FIXUP_CHAINS]; |
252b5132 | 137 | |
002de68b JH |
138 | void |
139 | gas_cgen_initialize_saved_fixups_array () | |
252b5132 | 140 | { |
002de68b JH |
141 | int i = 0; |
142 | while (i < MAX_SAVED_FIXUP_CHAINS) | |
143 | stored_fixups[i++].num_fixups_in_chain = 0; | |
252b5132 RH |
144 | } |
145 | ||
002de68b JH |
146 | void |
147 | gas_cgen_save_fixups (int i) | |
252b5132 | 148 | { |
002de68b JH |
149 | if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS) |
150 | { | |
0e389e77 | 151 | as_fatal("index into stored_fixups[] out of bounds"); |
002de68b JH |
152 | return; |
153 | } | |
154 | stored_fixups[i].num_fixups_in_chain = num_fixups; | |
155 | memcpy(stored_fixups[i].fixup_chain, fixups, | |
156 | sizeof (fixups[0])*num_fixups); | |
157 | num_fixups = 0; | |
252b5132 RH |
158 | } |
159 | ||
002de68b JH |
160 | void |
161 | gas_cgen_restore_fixups (int i) | |
252b5132 | 162 | { |
002de68b JH |
163 | if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS) |
164 | { | |
0e389e77 | 165 | as_fatal("index into stored_fixups[] out of bounds"); |
002de68b JH |
166 | return; |
167 | } | |
168 | num_fixups = stored_fixups[i].num_fixups_in_chain; | |
169 | memcpy(fixups,stored_fixups[i].fixup_chain, | |
170 | (sizeof (stored_fixups[i].fixup_chain[0]))*num_fixups); | |
171 | stored_fixups[i].num_fixups_in_chain = 0; | |
172 | } | |
252b5132 | 173 | |
002de68b JH |
174 | void |
175 | gas_cgen_swap_fixups (int i) | |
176 | { | |
177 | int tmp; | |
178 | struct fixup tmp_fixup; | |
179 | ||
180 | if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS) | |
181 | { | |
0e389e77 | 182 | as_fatal("index into stored_fixups[] out of bounds"); |
002de68b JH |
183 | return; |
184 | } | |
185 | ||
186 | if (num_fixups == 0) | |
187 | { | |
188 | gas_cgen_restore_fixups (i); | |
189 | } | |
190 | else if (stored_fixups[i].num_fixups_in_chain == 0) | |
191 | { | |
192 | gas_cgen_save_fixups (i); | |
193 | } | |
194 | else | |
195 | { | |
196 | tmp = stored_fixups[i].num_fixups_in_chain; | |
197 | stored_fixups[i].num_fixups_in_chain = num_fixups; | |
198 | num_fixups = tmp; | |
199 | ||
200 | for (tmp = GAS_CGEN_MAX_FIXUPS; tmp--;) | |
201 | { | |
202 | tmp_fixup = stored_fixups[i].fixup_chain [tmp]; | |
203 | stored_fixups[i].fixup_chain[tmp] = fixups [tmp]; | |
204 | fixups [tmp] = tmp_fixup; | |
205 | } | |
252b5132 RH |
206 | } |
207 | } | |
208 | ||
209 | /* Default routine to record a fixup. | |
210 | This is a cover function to fix_new. | |
211 | It exists because we record INSN with the fixup. | |
212 | ||
213 | FRAG and WHERE are their respective arguments to fix_new_exp. | |
214 | LENGTH is in bits. | |
215 | OPINFO is something the caller chooses to help in reloc determination. | |
216 | ||
217 | At this point we do not use a bfd_reloc_code_real_type for | |
218 | operands residing in the insn, but instead just use the | |
219 | operand index. This lets us easily handle fixups for any | |
220 | operand type. We pick a BFD reloc type in md_apply_fix. */ | |
221 | ||
222 | fixS * | |
223 | gas_cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offset) | |
224 | fragS * frag; | |
225 | int where; | |
226 | const CGEN_INSN * insn; | |
227 | int length; | |
228 | const CGEN_OPERAND * operand; | |
229 | int opinfo; | |
230 | symbolS * symbol; | |
231 | offsetT offset; | |
232 | { | |
542d6675 | 233 | fixS *fixP; |
252b5132 RH |
234 | |
235 | /* It may seem strange to use operand->attrs and not insn->attrs here, | |
236 | but it is the operand that has a pc relative relocation. */ | |
237 | ||
238 | fixP = fix_new (frag, where, length / 8, symbol, offset, | |
239 | CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR), | |
240 | (bfd_reloc_code_real_type) | |
241 | ((int) BFD_RELOC_UNUSED | |
242 | + (int) operand->type)); | |
243 | fixP->fx_cgen.insn = insn; | |
244 | fixP->fx_cgen.opinfo = opinfo; | |
245 | ||
246 | return fixP; | |
247 | } | |
248 | ||
249 | /* Default routine to record a fixup given an expression. | |
250 | This is a cover function to fix_new_exp. | |
251 | It exists because we record INSN with the fixup. | |
252 | ||
253 | FRAG and WHERE are their respective arguments to fix_new_exp. | |
254 | LENGTH is in bits. | |
255 | OPINFO is something the caller chooses to help in reloc determination. | |
256 | ||
257 | At this point we do not use a bfd_reloc_code_real_type for | |
258 | operands residing in the insn, but instead just use the | |
259 | operand index. This lets us easily handle fixups for any | |
260 | operand type. We pick a BFD reloc type in md_apply_fix. */ | |
261 | ||
262 | fixS * | |
263 | gas_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp) | |
264 | fragS * frag; | |
265 | int where; | |
266 | const CGEN_INSN * insn; | |
267 | int length; | |
268 | const CGEN_OPERAND * operand; | |
269 | int opinfo; | |
270 | expressionS * exp; | |
271 | { | |
542d6675 | 272 | fixS *fixP; |
252b5132 RH |
273 | |
274 | /* It may seem strange to use operand->attrs and not insn->attrs here, | |
275 | but it is the operand that has a pc relative relocation. */ | |
276 | ||
277 | fixP = fix_new_exp (frag, where, length / 8, exp, | |
278 | CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR), | |
279 | (bfd_reloc_code_real_type) | |
280 | ((int) BFD_RELOC_UNUSED | |
281 | + (int) operand->type)); | |
282 | fixP->fx_cgen.insn = insn; | |
283 | fixP->fx_cgen.opinfo = opinfo; | |
284 | ||
285 | return fixP; | |
286 | } | |
287 | ||
288 | /* Used for communication between the next two procedures. */ | |
289 | static jmp_buf expr_jmp_buf; | |
680d2857 | 290 | static int expr_jmp_buf_p; |
252b5132 RH |
291 | |
292 | /* Callback for cgen interface. Parse the expression at *STRP. | |
293 | The result is an error message or NULL for success (in which case | |
294 | *STRP is advanced past the parsed text). | |
295 | WANT is an indication of what the caller is looking for. | |
296 | If WANT == CGEN_ASM_PARSE_INIT the caller is beginning to try to match | |
297 | a table entry with the insn, reset the queued fixups counter. | |
298 | An enum cgen_parse_operand_result is stored in RESULTP. | |
299 | OPINDEX is the operand's table entry index. | |
300 | OPINFO is something the caller chooses to help in reloc determination. | |
301 | The resulting value is stored in VALUEP. */ | |
302 | ||
303 | const char * | |
304 | gas_cgen_parse_operand (cd, want, strP, opindex, opinfo, resultP, valueP) | |
eabed1c0 | 305 | CGEN_CPU_DESC cd ATTRIBUTE_UNUSED; |
252b5132 | 306 | enum cgen_parse_operand_type want; |
542d6675 | 307 | const char **strP; |
252b5132 RH |
308 | int opindex; |
309 | int opinfo; | |
542d6675 KH |
310 | enum cgen_parse_operand_result *resultP; |
311 | bfd_vma *valueP; | |
252b5132 RH |
312 | { |
313 | #ifdef __STDC__ | |
314 | /* These are volatile to survive the setjmp. */ | |
315 | char * volatile hold; | |
316 | enum cgen_parse_operand_result * volatile resultP_1; | |
317 | #else | |
542d6675 KH |
318 | static char *hold; |
319 | static enum cgen_parse_operand_result *resultP_1; | |
252b5132 | 320 | #endif |
542d6675 | 321 | const char *errmsg = NULL; |
252b5132 RH |
322 | expressionS exp; |
323 | ||
324 | if (want == CGEN_PARSE_OPERAND_INIT) | |
325 | { | |
326 | gas_cgen_init_parse (); | |
327 | return NULL; | |
328 | } | |
329 | ||
330 | resultP_1 = resultP; | |
331 | hold = input_line_pointer; | |
542d6675 | 332 | input_line_pointer = (char *) *strP; |
252b5132 RH |
333 | |
334 | /* We rely on md_operand to longjmp back to us. | |
335 | This is done via gas_cgen_md_operand. */ | |
336 | if (setjmp (expr_jmp_buf) != 0) | |
337 | { | |
680d2857 | 338 | expr_jmp_buf_p = 0; |
252b5132 | 339 | input_line_pointer = (char *) hold; |
542d6675 | 340 | *resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR; |
252b5132 RH |
341 | return "illegal operand"; |
342 | } | |
343 | ||
680d2857 | 344 | expr_jmp_buf_p = 1; |
542d6675 | 345 | expression (&exp); |
680d2857 | 346 | expr_jmp_buf_p = 0; |
252b5132 | 347 | |
542d6675 | 348 | *strP = input_line_pointer; |
252b5132 RH |
349 | input_line_pointer = hold; |
350 | ||
351 | /* FIXME: Need to check `want'. */ | |
352 | ||
353 | switch (exp.X_op) | |
354 | { | |
542d6675 | 355 | case O_illegal: |
252b5132 | 356 | errmsg = _("illegal operand"); |
542d6675 | 357 | *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; |
252b5132 | 358 | break; |
542d6675 | 359 | case O_absent: |
252b5132 | 360 | errmsg = _("missing operand"); |
542d6675 | 361 | *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; |
252b5132 | 362 | break; |
542d6675 KH |
363 | case O_constant: |
364 | *valueP = exp.X_add_number; | |
365 | *resultP = CGEN_PARSE_OPERAND_RESULT_NUMBER; | |
252b5132 | 366 | break; |
542d6675 KH |
367 | case O_register: |
368 | *valueP = exp.X_add_number; | |
369 | *resultP = CGEN_PARSE_OPERAND_RESULT_REGISTER; | |
252b5132 | 370 | break; |
542d6675 | 371 | default: |
30a2b4ef | 372 | queue_fixup (opindex, opinfo, &exp); |
542d6675 KH |
373 | *valueP = 0; |
374 | *resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED; | |
252b5132 RH |
375 | break; |
376 | } | |
377 | ||
378 | return errmsg; | |
379 | } | |
380 | ||
381 | /* md_operand handler to catch unrecognized expressions and halt the | |
382 | parsing process so the next entry can be tried. | |
383 | ||
384 | ??? This could be done differently by adding code to `expression'. */ | |
385 | ||
386 | void | |
387 | gas_cgen_md_operand (expressionP) | |
542d6675 | 388 | expressionS *expressionP ATTRIBUTE_UNUSED; |
252b5132 | 389 | { |
680d2857 FCE |
390 | /* Don't longjmp if we're not called from within cgen_parse_operand(). */ |
391 | if (expr_jmp_buf_p) | |
392 | longjmp (expr_jmp_buf, 1); | |
252b5132 RH |
393 | } |
394 | ||
395 | /* Finish assembling instruction INSN. | |
396 | BUF contains what we've built up so far. | |
397 | LENGTH is the size of the insn in bits. | |
398 | RELAX_P is non-zero if relaxable insns should be emitted as such. | |
399 | Otherwise they're emitted in non-relaxable forms. | |
400 | The "result" is stored in RESULT if non-NULL. */ | |
401 | ||
402 | void | |
403 | gas_cgen_finish_insn (insn, buf, length, relax_p, result) | |
542d6675 | 404 | const CGEN_INSN *insn; |
252b5132 RH |
405 | CGEN_INSN_BYTES_PTR buf; |
406 | unsigned int length; | |
407 | int relax_p; | |
542d6675 | 408 | finished_insnS *result; |
252b5132 RH |
409 | { |
410 | int i; | |
411 | int relax_operand; | |
542d6675 | 412 | char *f; |
252b5132 RH |
413 | unsigned int byte_len = length / 8; |
414 | ||
415 | /* ??? Target foo issues various warnings here, so one might want to provide | |
416 | a hook here. However, our caller is defined in tc-foo.c so there | |
417 | shouldn't be a need for a hook. */ | |
418 | ||
419 | /* Write out the instruction. | |
420 | It is important to fetch enough space in one call to `frag_more'. | |
421 | We use (f - frag_now->fr_literal) to compute where we are and we | |
422 | don't want frag_now to change between calls. | |
423 | ||
424 | Relaxable instructions: We need to ensure we allocate enough | |
425 | space for the largest insn. */ | |
426 | ||
427 | if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX)) | |
542d6675 KH |
428 | /* These currently shouldn't get here. */ |
429 | abort (); | |
252b5132 RH |
430 | |
431 | /* Is there a relaxable insn with the relaxable operand needing a fixup? */ | |
432 | ||
433 | relax_operand = -1; | |
434 | if (relax_p && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXABLE)) | |
435 | { | |
436 | /* Scan the fixups for the operand affected by relaxing | |
437 | (i.e. the branch address). */ | |
438 | ||
542d6675 | 439 | for (i = 0; i < num_fixups; ++i) |
252b5132 RH |
440 | { |
441 | if (CGEN_OPERAND_ATTR_VALUE (cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex), | |
442 | CGEN_OPERAND_RELAX)) | |
443 | { | |
444 | relax_operand = i; | |
445 | break; | |
446 | } | |
447 | } | |
448 | } | |
449 | ||
450 | if (relax_operand != -1) | |
451 | { | |
452 | int max_len; | |
542d6675 | 453 | fragS *old_frag; |
2289f85d AM |
454 | expressionS *exp; |
455 | symbolS *sym; | |
456 | offsetT off; | |
252b5132 RH |
457 | |
458 | #ifdef TC_CGEN_MAX_RELAX | |
459 | max_len = TC_CGEN_MAX_RELAX (insn, byte_len); | |
460 | #else | |
461 | max_len = CGEN_MAX_INSN_SIZE; | |
462 | #endif | |
463 | /* Ensure variable part and fixed part are in same fragment. */ | |
464 | /* FIXME: Having to do this seems like a hack. */ | |
465 | frag_grow (max_len); | |
466 | ||
467 | /* Allocate space for the fixed part. */ | |
468 | f = frag_more (byte_len); | |
469 | ||
470 | /* Create a relaxable fragment for this instruction. */ | |
471 | old_frag = frag_now; | |
472 | ||
2289f85d AM |
473 | exp = &fixups[relax_operand].exp; |
474 | sym = exp->X_add_symbol; | |
475 | off = exp->X_add_number; | |
476 | if (exp->X_op != O_constant && exp->X_op != O_symbol) | |
477 | { | |
478 | /* Handle complex expressions. */ | |
479 | sym = make_expr_symbol (exp); | |
480 | off = 0; | |
481 | } | |
482 | ||
252b5132 RH |
483 | frag_var (rs_machine_dependent, |
484 | max_len - byte_len /* max chars */, | |
485 | 0 /* variable part already allocated */, | |
486 | /* FIXME: When we machine generate the relax table, | |
487 | machine generate a macro to compute subtype. */ | |
488 | 1 /* subtype */, | |
2289f85d AM |
489 | sym, |
490 | off, | |
252b5132 RH |
491 | f); |
492 | ||
493 | /* Record the operand number with the fragment so md_convert_frag | |
494 | can use gas_cgen_md_record_fixup to record the appropriate reloc. */ | |
495 | old_frag->fr_cgen.insn = insn; | |
496 | old_frag->fr_cgen.opindex = fixups[relax_operand].opindex; | |
497 | old_frag->fr_cgen.opinfo = fixups[relax_operand].opinfo; | |
498 | if (result) | |
499 | result->frag = old_frag; | |
500 | } | |
501 | else | |
502 | { | |
503 | f = frag_more (byte_len); | |
504 | if (result) | |
505 | result->frag = frag_now; | |
506 | } | |
507 | ||
508 | /* If we're recording insns as numbers (rather than a string of bytes), | |
509 | target byte order handling is deferred until now. */ | |
510 | #if CGEN_INT_INSN_P | |
511 | cgen_put_insn_value (gas_cgen_cpu_desc, f, length, *buf); | |
512 | #else | |
513 | memcpy (f, buf, byte_len); | |
514 | #endif | |
515 | ||
272d76e0 FCE |
516 | /* Emit DWARF2 debugging information. */ |
517 | dwarf2_emit_insn (byte_len); | |
518 | ||
252b5132 RH |
519 | /* Create any fixups. */ |
520 | for (i = 0; i < num_fixups; ++i) | |
521 | { | |
522 | fixS *fixP; | |
523 | const CGEN_OPERAND *operand = | |
524 | cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex); | |
525 | ||
526 | /* Don't create fixups for these. That's done during relaxation. | |
527 | We don't need to test for CGEN_INSN_RELAX as they can't get here | |
528 | (see above). */ | |
529 | if (relax_p | |
530 | && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXABLE) | |
531 | && CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_RELAX)) | |
532 | continue; | |
533 | ||
534 | #ifndef md_cgen_record_fixup_exp | |
535 | #define md_cgen_record_fixup_exp gas_cgen_record_fixup_exp | |
536 | #endif | |
537 | ||
542d6675 KH |
538 | fixP = md_cgen_record_fixup_exp (frag_now, f - frag_now->fr_literal, |
539 | insn, length, operand, | |
540 | fixups[i].opinfo, | |
541 | &fixups[i].exp); | |
542 | if (result) | |
543 | result->fixups[i] = fixP; | |
252b5132 RH |
544 | } |
545 | ||
546 | if (result) | |
547 | { | |
548 | result->num_fixups = num_fixups; | |
549 | result->addr = f; | |
550 | } | |
551 | } | |
552 | ||
553 | /* Apply a fixup to the object code. This is called for all the | |
554 | fixups we generated by the call to fix_new_exp, above. In the call | |
555 | above we used a reloc code which was the largest legal reloc code | |
556 | plus the operand index. Here we undo that to recover the operand | |
557 | index. At this point all symbol values should be fully resolved, | |
558 | and we attempt to completely resolve the reloc. If we can not do | |
559 | that, we determine the correct reloc code and put it back in the fixup. */ | |
560 | ||
561 | /* FIXME: This function handles some of the fixups and bfd_install_relocation | |
562 | handles the rest. bfd_install_relocation (or some other bfd function) | |
563 | should handle them all. */ | |
564 | ||
565 | int | |
566 | gas_cgen_md_apply_fix3 (fixP, valueP, seg) | |
567 | fixS * fixP; | |
568 | valueT * valueP; | |
eabed1c0 | 569 | segT seg ATTRIBUTE_UNUSED; |
252b5132 | 570 | { |
542d6675 | 571 | char *where = fixP->fx_frag->fr_literal + fixP->fx_where; |
252b5132 | 572 | valueT value; |
542d6675 | 573 | /* Canonical name, since used a lot. */ |
252b5132 | 574 | CGEN_CPU_DESC cd = gas_cgen_cpu_desc; |
542d6675 | 575 | |
252b5132 RH |
576 | /* FIXME FIXME FIXME: The value we are passed in *valuep includes |
577 | the symbol values. Since we are using BFD_ASSEMBLER, if we are | |
578 | doing this relocation the code in write.c is going to call | |
579 | bfd_install_relocation, which is also going to use the symbol | |
580 | value. That means that if the reloc is fully resolved we want to | |
581 | use *valuep since bfd_install_relocation is not being used. | |
582 | However, if the reloc is not fully resolved we do not want to use | |
583 | *valuep, and must use fx_offset instead. However, if the reloc | |
584 | is PC relative, we do want to use *valuep since it includes the | |
585 | result of md_pcrel_from. This is confusing. */ | |
586 | ||
587 | if (fixP->fx_addsy == (symbolS *) NULL) | |
588 | { | |
542d6675 | 589 | value = *valueP; |
252b5132 RH |
590 | fixP->fx_done = 1; |
591 | } | |
592 | else if (fixP->fx_pcrel) | |
542d6675 | 593 | value = *valueP; |
252b5132 RH |
594 | else |
595 | { | |
596 | value = fixP->fx_offset; | |
597 | if (fixP->fx_subsy != (symbolS *) NULL) | |
598 | { | |
599 | if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section) | |
600 | value -= S_GET_VALUE (fixP->fx_subsy); | |
601 | else | |
602 | { | |
603 | /* We don't actually support subtracting a symbol. */ | |
542d6675 | 604 | as_bad_where (fixP->fx_file, fixP->fx_line, |
252b5132 RH |
605 | _("expression too complex")); |
606 | } | |
607 | } | |
608 | } | |
609 | ||
610 | if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) | |
611 | { | |
612 | int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; | |
613 | const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (cd, opindex); | |
614 | const char *errmsg; | |
615 | bfd_reloc_code_real_type reloc_type; | |
616 | CGEN_FIELDS *fields = alloca (CGEN_CPU_SIZEOF_FIELDS (cd)); | |
617 | const CGEN_INSN *insn = fixP->fx_cgen.insn; | |
618 | ||
619 | /* If the reloc has been fully resolved finish the operand here. */ | |
620 | /* FIXME: This duplicates the capabilities of code in BFD. */ | |
621 | if (fixP->fx_done | |
622 | /* FIXME: If partial_inplace isn't set bfd_install_relocation won't | |
623 | finish the job. Testing for pcrel is a temporary hack. */ | |
624 | || fixP->fx_pcrel) | |
625 | { | |
626 | CGEN_CPU_SET_FIELDS_BITSIZE (cd) (fields, CGEN_INSN_BITSIZE (insn)); | |
627 | CGEN_CPU_SET_VMA_OPERAND (cd) (cd, opindex, fields, (bfd_vma) value); | |
628 | ||
629 | #if CGEN_INT_INSN_P | |
630 | { | |
631 | CGEN_INSN_INT insn_value = | |
632 | cgen_get_insn_value (cd, where, CGEN_INSN_BITSIZE (insn)); | |
633 | ||
542d6675 | 634 | /* ??? 0 is passed for `pc'. */ |
252b5132 RH |
635 | errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, |
636 | &insn_value, (bfd_vma) 0); | |
637 | cgen_put_insn_value (cd, where, CGEN_INSN_BITSIZE (insn), | |
638 | insn_value); | |
639 | } | |
640 | #else | |
542d6675 KH |
641 | /* ??? 0 is passed for `pc'. */ |
642 | errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, where, | |
643 | (bfd_vma) 0); | |
252b5132 RH |
644 | #endif |
645 | if (errmsg) | |
646 | as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg); | |
647 | } | |
648 | ||
649 | if (fixP->fx_done) | |
650 | return 1; | |
651 | ||
652 | /* The operand isn't fully resolved. Determine a BFD reloc value | |
653 | based on the operand information and leave it to | |
654 | bfd_install_relocation. Note that this doesn't work when | |
655 | partial_inplace == false. */ | |
656 | ||
657 | reloc_type = md_cgen_lookup_reloc (insn, operand, fixP); | |
658 | if (reloc_type != BFD_RELOC_NONE) | |
659 | { | |
660 | fixP->fx_r_type = reloc_type; | |
661 | } | |
662 | else | |
663 | { | |
664 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
665 | _("unresolved expression that must be resolved")); | |
666 | fixP->fx_done = 1; | |
667 | return 1; | |
668 | } | |
669 | } | |
670 | else if (fixP->fx_done) | |
671 | { | |
672 | /* We're finished with this fixup. Install it because | |
673 | bfd_install_relocation won't be called to do it. */ | |
674 | switch (fixP->fx_r_type) | |
675 | { | |
676 | case BFD_RELOC_8: | |
677 | md_number_to_chars (where, value, 1); | |
678 | break; | |
679 | case BFD_RELOC_16: | |
680 | md_number_to_chars (where, value, 2); | |
681 | break; | |
682 | case BFD_RELOC_32: | |
683 | md_number_to_chars (where, value, 4); | |
684 | break; | |
363c574f MG |
685 | case BFD_RELOC_64: |
686 | md_number_to_chars (where, value, 8); | |
687 | break; | |
252b5132 RH |
688 | default: |
689 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
690 | _("internal error: can't install fix for reloc type %d (`%s')"), | |
691 | fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type)); | |
692 | break; | |
693 | } | |
694 | } | |
695 | else | |
696 | { | |
697 | /* bfd_install_relocation will be called to finish things up. */ | |
698 | } | |
699 | ||
700 | /* Tuck `value' away for use by tc_gen_reloc. | |
701 | See the comment describing fx_addnumber in write.h. | |
702 | This field is misnamed (or misused :-). */ | |
703 | fixP->fx_addnumber = value; | |
704 | ||
705 | return 1; | |
706 | } | |
707 | ||
708 | /* Translate internal representation of relocation info to BFD target format. | |
709 | ||
710 | FIXME: To what extent can we get all relevant targets to use this? */ | |
711 | ||
712 | arelent * | |
713 | gas_cgen_tc_gen_reloc (section, fixP) | |
eabed1c0 | 714 | asection * section ATTRIBUTE_UNUSED; |
252b5132 RH |
715 | fixS * fixP; |
716 | { | |
542d6675 | 717 | arelent *reloc; |
252b5132 RH |
718 | |
719 | reloc = (arelent *) xmalloc (sizeof (arelent)); | |
720 | ||
721 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); | |
722 | if (reloc->howto == (reloc_howto_type *) NULL) | |
723 | { | |
724 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
aaa4f6d9 | 725 | _("relocation is not supported")); |
252b5132 RH |
726 | return NULL; |
727 | } | |
728 | ||
729 | assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); | |
730 | ||
080e41e6 ILT |
731 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
732 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); | |
252b5132 | 733 | |
542d6675 KH |
734 | /* Use fx_offset for these cases. */ |
735 | if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY | |
252b5132 | 736 | || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT) |
542d6675 | 737 | reloc->addend = fixP->fx_offset; |
252b5132 | 738 | else |
542d6675 | 739 | reloc->addend = fixP->fx_addnumber; |
252b5132 RH |
740 | |
741 | reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; | |
742 | return reloc; | |
743 | } |