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841eff9e | 1 | /* GAS interface for targets using CGEN: Cpu tools GENerator. |
95effc2b | 2 | Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. |
841eff9e DE |
3 | |
4 | This file is part of GAS, the GNU Assembler. | |
5 | ||
6 | GAS is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GAS is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GAS; see the file COPYING. If not, write to the Free Software | |
18 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
1002d8ed | 20 | #include <setjmp.h> |
841eff9e DE |
21 | #include "ansidecl.h" |
22 | #include "bfd.h" | |
48401fcf | 23 | #include "symcat.h" |
841eff9e DE |
24 | #include "cgen-opc.h" |
25 | #include "as.h" | |
26 | #include "subsegs.h" | |
defc70bf | 27 | #include "cgen.h" |
841eff9e DE |
28 | |
29 | /* Callback to insert a register into the symbol table. | |
30 | A target may choose to let GAS parse the registers. | |
31 | ??? Not currently used. */ | |
32 | ||
33 | void | |
34 | cgen_asm_record_register (name, number) | |
ebde3f62 | 35 | char * name; |
defc70bf | 36 | int number; |
841eff9e DE |
37 | { |
38 | /* Use symbol_create here instead of symbol_new so we don't try to | |
39 | output registers into the object file's symbol table. */ | |
40 | symbol_table_insert (symbol_create (name, reg_section, | |
ebde3f62 | 41 | number, & zero_address_frag)); |
841eff9e DE |
42 | } |
43 | ||
44 | /* We need to keep a list of fixups. We can't simply generate them as | |
45 | we go, because that would require us to first create the frag, and | |
46 | that would screw up references to ``.''. | |
47 | ||
48 | This is used by cpu's with simple operands. It keeps knowledge of what | |
49 | an `expressionS' is and what a `fixup' is out of CGEN which for the time | |
50 | being is preferable. | |
51 | ||
52 | OPINDEX is the index in the operand table. | |
53 | OPINFO is something the caller chooses to help in reloc determination. */ | |
54 | ||
55 | struct fixup | |
56 | { | |
defc70bf DE |
57 | int opindex; |
58 | int opinfo; | |
841eff9e DE |
59 | expressionS exp; |
60 | }; | |
61 | ||
defc70bf DE |
62 | static struct fixup fixups [CGEN_MAX_FIXUPS]; |
63 | static int num_fixups; | |
841eff9e | 64 | |
f3f00e94 DE |
65 | /* Prepare to parse an instruction. |
66 | ??? May wish to make this static and delete calls in md_assemble. */ | |
67 | ||
841eff9e DE |
68 | void |
69 | cgen_asm_init_parse () | |
70 | { | |
71 | num_fixups = 0; | |
72 | } | |
73 | ||
74 | /* Queue a fixup. */ | |
75 | ||
95effc2b | 76 | static void |
841eff9e | 77 | cgen_queue_fixup (opindex, opinfo, expP) |
ebde3f62 NC |
78 | int opindex; |
79 | expressionS * expP; | |
841eff9e DE |
80 | { |
81 | /* We need to generate a fixup for this expression. */ | |
defc70bf | 82 | if (num_fixups >= CGEN_MAX_FIXUPS) |
48401fcf | 83 | as_fatal (_("too many fixups")); |
ebde3f62 | 84 | fixups[num_fixups].exp = * expP; |
841eff9e | 85 | fixups[num_fixups].opindex = opindex; |
ebde3f62 NC |
86 | fixups[num_fixups].opinfo = opinfo; |
87 | ++ num_fixups; | |
841eff9e DE |
88 | } |
89 | ||
95effc2b DE |
90 | /* The following three functions allow a backup of the fixup chain to be made, |
91 | and to have this backup be swapped with the current chain. This allows | |
92 | certain ports, eg the m32r, to swap two instructions and swap their fixups | |
93 | at the same time. */ | |
defc70bf DE |
94 | static struct fixup saved_fixups [CGEN_MAX_FIXUPS]; |
95 | static int saved_num_fixups; | |
95effc2b DE |
96 | |
97 | void | |
98 | cgen_save_fixups () | |
99 | { | |
100 | saved_num_fixups = num_fixups; | |
101 | ||
102 | memcpy (saved_fixups, fixups, sizeof (fixups[0]) * num_fixups); | |
103 | ||
104 | num_fixups = 0; | |
105 | } | |
106 | ||
107 | void | |
108 | cgen_restore_fixups () | |
109 | { | |
110 | num_fixups = saved_num_fixups; | |
111 | ||
112 | memcpy (fixups, saved_fixups, sizeof (fixups[0]) * num_fixups); | |
113 | ||
114 | saved_num_fixups = 0; | |
115 | } | |
116 | ||
117 | void | |
118 | cgen_swap_fixups () | |
119 | { | |
defc70bf | 120 | int tmp; |
95effc2b DE |
121 | struct fixup tmp_fixup; |
122 | ||
123 | if (num_fixups == 0) | |
124 | { | |
125 | cgen_restore_fixups (); | |
126 | } | |
127 | else if (saved_num_fixups == 0) | |
128 | { | |
129 | cgen_save_fixups (); | |
130 | } | |
131 | else | |
132 | { | |
133 | tmp = saved_num_fixups; | |
134 | saved_num_fixups = num_fixups; | |
135 | num_fixups = tmp; | |
136 | ||
defc70bf | 137 | for (tmp = CGEN_MAX_FIXUPS; tmp--;) |
95effc2b DE |
138 | { |
139 | tmp_fixup = saved_fixups [tmp]; | |
140 | saved_fixups [tmp] = fixups [tmp]; | |
141 | fixups [tmp] = tmp_fixup; | |
142 | } | |
143 | } | |
144 | } | |
145 | ||
841eff9e DE |
146 | /* Default routine to record a fixup. |
147 | This is a cover function to fix_new. | |
148 | It exists because we record INSN with the fixup. | |
149 | ||
150 | FRAG and WHERE are their respective arguments to fix_new_exp. | |
151 | LENGTH is in bits. | |
152 | OPINFO is something the caller chooses to help in reloc determination. | |
153 | ||
154 | At this point we do not use a bfd_reloc_code_real_type for | |
155 | operands residing in the insn, but instead just use the | |
156 | operand index. This lets us easily handle fixups for any | |
157 | operand type. We pick a BFD reloc type in md_apply_fix. */ | |
158 | ||
159 | fixS * | |
160 | cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offset) | |
ebde3f62 NC |
161 | fragS * frag; |
162 | int where; | |
163 | const CGEN_INSN * insn; | |
164 | int length; | |
165 | const CGEN_OPERAND * operand; | |
166 | int opinfo; | |
167 | symbolS * symbol; | |
168 | offsetT offset; | |
841eff9e | 169 | { |
ebde3f62 | 170 | fixS * fixP; |
841eff9e DE |
171 | |
172 | /* It may seem strange to use operand->attrs and not insn->attrs here, | |
173 | but it is the operand that has a pc relative relocation. */ | |
174 | ||
175 | fixP = fix_new (frag, where, length / 8, symbol, offset, | |
176 | CGEN_OPERAND_ATTR (operand, CGEN_OPERAND_PCREL_ADDR) != 0, | |
177 | (bfd_reloc_code_real_type) ((int) BFD_RELOC_UNUSED + CGEN_OPERAND_INDEX (operand))); | |
ebde3f62 | 178 | fixP->tc_fix_data.insn = (PTR) insn; |
841eff9e DE |
179 | fixP->tc_fix_data.opinfo = opinfo; |
180 | ||
181 | return fixP; | |
182 | } | |
183 | ||
184 | /* Default routine to record a fixup given an expression. | |
185 | This is a cover function to fix_new_exp. | |
186 | It exists because we record INSN with the fixup. | |
187 | ||
188 | FRAG and WHERE are their respective arguments to fix_new_exp. | |
189 | LENGTH is in bits. | |
190 | OPINFO is something the caller chooses to help in reloc determination. | |
191 | ||
192 | At this point we do not use a bfd_reloc_code_real_type for | |
193 | operands residing in the insn, but instead just use the | |
194 | operand index. This lets us easily handle fixups for any | |
195 | operand type. We pick a BFD reloc type in md_apply_fix. */ | |
196 | ||
197 | fixS * | |
198 | cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp) | |
ebde3f62 NC |
199 | fragS * frag; |
200 | int where; | |
201 | const CGEN_INSN * insn; | |
202 | int length; | |
203 | const CGEN_OPERAND * operand; | |
204 | int opinfo; | |
205 | expressionS * exp; | |
841eff9e | 206 | { |
ebde3f62 | 207 | fixS * fixP; |
841eff9e DE |
208 | |
209 | /* It may seem strange to use operand->attrs and not insn->attrs here, | |
210 | but it is the operand that has a pc relative relocation. */ | |
211 | ||
212 | fixP = fix_new_exp (frag, where, length / 8, exp, | |
213 | CGEN_OPERAND_ATTR (operand, CGEN_OPERAND_PCREL_ADDR) != 0, | |
214 | (bfd_reloc_code_real_type) ((int) BFD_RELOC_UNUSED + CGEN_OPERAND_INDEX (operand))); | |
215 | fixP->tc_fix_data.insn = (PTR) insn; | |
216 | fixP->tc_fix_data.opinfo = opinfo; | |
217 | ||
218 | return fixP; | |
219 | } | |
220 | ||
1002d8ed DE |
221 | /* Used for communication between the next two procedures. */ |
222 | static jmp_buf expr_jmp_buf; | |
223 | ||
841eff9e DE |
224 | /* Callback for cgen interface. Parse the expression at *STRP. |
225 | The result is an error message or NULL for success (in which case | |
226 | *STRP is advanced past the parsed text). | |
f3f00e94 DE |
227 | WANT is an indication of what the caller is looking for. |
228 | If WANT == CGEN_ASM_PARSE_INIT the caller is beginning to try to match | |
229 | a table entry with the insn, reset the queued fixups counter. | |
230 | An enum cgen_parse_operand_result is stored in RESULTP. | |
231 | OPINDEX is the operand's table entry index. | |
841eff9e DE |
232 | OPINFO is something the caller chooses to help in reloc determination. |
233 | The resulting value is stored in VALUEP. */ | |
234 | ||
235 | const char * | |
f3f00e94 | 236 | cgen_parse_operand (want, strP, opindex, opinfo, resultP, valueP) |
defc70bf DE |
237 | enum cgen_parse_operand_type want; |
238 | const char ** strP; | |
239 | int opindex; | |
240 | int opinfo; | |
ebde3f62 | 241 | enum cgen_parse_operand_result * resultP; |
defc70bf | 242 | bfd_vma * valueP; |
841eff9e | 243 | { |
1002d8ed | 244 | #ifdef __STDC__ |
defc70bf DE |
245 | /* These are volatile to survive the setjmp. */ |
246 | char * volatile hold; | |
1002d8ed DE |
247 | enum cgen_parse_operand_result * volatile resultP_1; |
248 | #else | |
defc70bf DE |
249 | static char * hold; |
250 | static enum cgen_parse_operand_result * resultP_1; | |
1002d8ed | 251 | #endif |
defc70bf DE |
252 | const char * errmsg = NULL; |
253 | expressionS exp; | |
841eff9e | 254 | |
f3f00e94 DE |
255 | if (want == CGEN_PARSE_OPERAND_INIT) |
256 | { | |
257 | cgen_asm_init_parse (); | |
258 | return NULL; | |
259 | } | |
260 | ||
1002d8ed | 261 | resultP_1 = resultP; |
841eff9e | 262 | hold = input_line_pointer; |
ebde3f62 | 263 | input_line_pointer = (char *) * strP; |
1002d8ed DE |
264 | |
265 | /* We rely on md_operand to longjmp back to us. | |
266 | This is done via cgen_md_operand. */ | |
267 | if (setjmp (expr_jmp_buf) != 0) | |
268 | { | |
269 | input_line_pointer = (char *) hold; | |
ebde3f62 | 270 | * resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR; |
1002d8ed DE |
271 | return "illegal operand"; |
272 | } | |
273 | ||
ebde3f62 | 274 | expression (& exp); |
1002d8ed | 275 | |
ebde3f62 | 276 | * strP = input_line_pointer; |
841eff9e DE |
277 | input_line_pointer = hold; |
278 | ||
f3f00e94 DE |
279 | /* FIXME: Need to check `want'. */ |
280 | ||
841eff9e DE |
281 | switch (exp.X_op) |
282 | { | |
283 | case O_illegal : | |
48401fcf | 284 | errmsg = _("illegal operand"); |
ebde3f62 | 285 | * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; |
841eff9e DE |
286 | break; |
287 | case O_absent : | |
48401fcf | 288 | errmsg = _("missing operand"); |
ebde3f62 | 289 | * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR; |
841eff9e DE |
290 | break; |
291 | case O_constant : | |
ebde3f62 NC |
292 | * valueP = exp.X_add_number; |
293 | * resultP = CGEN_PARSE_OPERAND_RESULT_NUMBER; | |
841eff9e DE |
294 | break; |
295 | case O_register : | |
ebde3f62 NC |
296 | * valueP = exp.X_add_number; |
297 | * resultP = CGEN_PARSE_OPERAND_RESULT_REGISTER; | |
841eff9e DE |
298 | break; |
299 | default : | |
ebde3f62 NC |
300 | cgen_queue_fixup (opindex, opinfo, & exp); |
301 | * valueP = 0; | |
302 | * resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED; | |
841eff9e DE |
303 | break; |
304 | } | |
305 | ||
306 | return errmsg; | |
307 | } | |
308 | ||
1002d8ed DE |
309 | /* md_operand handler to catch unrecognized expressions and halt the |
310 | parsing process so the next entry can be tried. | |
311 | ||
312 | ??? This could be done differently by adding code to `expression'. */ | |
313 | ||
314 | void | |
315 | cgen_md_operand (expressionP) | |
ebde3f62 | 316 | expressionS * expressionP; |
1002d8ed DE |
317 | { |
318 | longjmp (expr_jmp_buf, 1); | |
319 | } | |
320 | ||
841eff9e DE |
321 | /* Finish assembling instruction INSN. |
322 | BUF contains what we've built up so far. | |
95effc2b | 323 | LENGTH is the size of the insn in bits. |
defc70bf DE |
324 | RELAX_P is non-zero if relaxable insns should be emitted as such. |
325 | Otherwise they're emitted in non-relaxable forms. | |
326 | The "result" is stored in RESULT if non-NULL. | |
95effc2b DE |
327 | Returns the address of the buffer containing the assembled instruction, |
328 | in case the caller needs to modify it for some reason. */ | |
841eff9e | 329 | |
defc70bf DE |
330 | void |
331 | cgen_asm_finish_insn (insn, buf, length, relax_p, result) | |
ebde3f62 | 332 | const CGEN_INSN * insn; |
defc70bf DE |
333 | cgen_insn_t * buf; |
334 | unsigned int length; | |
335 | int relax_p; | |
b70d5374 | 336 | finished_insnS * result; |
841eff9e | 337 | { |
defc70bf DE |
338 | int i; |
339 | int relax_operand; | |
340 | char * f; | |
841eff9e DE |
341 | unsigned int byte_len = length / 8; |
342 | ||
343 | /* ??? Target foo issues various warnings here, so one might want to provide | |
344 | a hook here. However, our caller is defined in tc-foo.c so there | |
345 | shouldn't be a need for a hook. */ | |
95effc2b | 346 | |
841eff9e DE |
347 | /* Write out the instruction. |
348 | It is important to fetch enough space in one call to `frag_more'. | |
349 | We use (f - frag_now->fr_literal) to compute where we are and we | |
350 | don't want frag_now to change between calls. | |
351 | ||
352 | Relaxable instructions: We need to ensure we allocate enough | |
353 | space for the largest insn. */ | |
354 | ||
355 | if (CGEN_INSN_ATTR (insn, CGEN_INSN_RELAX) != 0) | |
356 | abort (); /* These currently shouldn't get here. */ | |
357 | ||
358 | /* Is there a relaxable insn with the relaxable operand needing a fixup? */ | |
359 | ||
360 | relax_operand = -1; | |
defc70bf | 361 | if (relax_p && CGEN_INSN_ATTR (insn, CGEN_INSN_RELAXABLE) != 0) |
841eff9e DE |
362 | { |
363 | /* Scan the fixups for the operand affected by relaxing | |
364 | (i.e. the branch address). */ | |
365 | ||
ebde3f62 | 366 | for (i = 0; i < num_fixups; ++ i) |
841eff9e DE |
367 | { |
368 | if (CGEN_OPERAND_ATTR (& CGEN_SYM (operand_table) [fixups[i].opindex], | |
369 | CGEN_OPERAND_RELAX) != 0) | |
370 | { | |
371 | relax_operand = i; | |
372 | break; | |
373 | } | |
374 | } | |
375 | } | |
376 | ||
377 | if (relax_operand != -1) | |
378 | { | |
defc70bf | 379 | int max_len; |
ebde3f62 | 380 | fragS * old_frag; |
841eff9e DE |
381 | |
382 | #ifdef TC_CGEN_MAX_RELAX | |
383 | max_len = TC_CGEN_MAX_RELAX (insn, byte_len); | |
384 | #else | |
385 | max_len = CGEN_MAX_INSN_SIZE; | |
386 | #endif | |
387 | /* Ensure variable part and fixed part are in same fragment. */ | |
388 | /* FIXME: Having to do this seems like a hack. */ | |
389 | frag_grow (max_len); | |
ebde3f62 | 390 | |
841eff9e DE |
391 | /* Allocate space for the fixed part. */ |
392 | f = frag_more (byte_len); | |
ebde3f62 | 393 | |
841eff9e DE |
394 | /* Create a relaxable fragment for this instruction. */ |
395 | old_frag = frag_now; | |
95effc2b | 396 | |
841eff9e DE |
397 | frag_var (rs_machine_dependent, |
398 | max_len - byte_len /* max chars */, | |
399 | 0 /* variable part already allocated */, | |
400 | /* FIXME: When we machine generate the relax table, | |
401 | machine generate a macro to compute subtype. */ | |
402 | 1 /* subtype */, | |
403 | fixups[relax_operand].exp.X_add_symbol, | |
404 | fixups[relax_operand].exp.X_add_number, | |
405 | f); | |
ebde3f62 | 406 | |
841eff9e DE |
407 | /* Record the operand number with the fragment so md_convert_frag |
408 | can use cgen_md_record_fixup to record the appropriate reloc. */ | |
ebde3f62 | 409 | old_frag->fr_cgen.insn = insn; |
1002d8ed | 410 | old_frag->fr_cgen.opindex = fixups[relax_operand].opindex; |
ebde3f62 | 411 | old_frag->fr_cgen.opinfo = fixups[relax_operand].opinfo; |
defc70bf DE |
412 | if (result) |
413 | result->frag = old_frag; | |
841eff9e DE |
414 | } |
415 | else | |
defc70bf DE |
416 | { |
417 | f = frag_more (byte_len); | |
418 | if (result) | |
419 | result->frag = frag_now; | |
420 | } | |
841eff9e DE |
421 | |
422 | /* If we're recording insns as numbers (rather than a string of bytes), | |
423 | target byte order handling is deferred until now. */ | |
424 | #if 0 /*def CGEN_INT_INSN*/ | |
425 | switch (length) | |
426 | { | |
427 | case 16: | |
428 | if (cgen_big_endian_p) | |
ebde3f62 | 429 | bfd_putb16 ((bfd_vma) * buf, f); |
841eff9e | 430 | else |
ebde3f62 | 431 | bfd_putl16 ((bfd_vma) * buf, f); |
841eff9e DE |
432 | break; |
433 | case 32: | |
434 | if (cgen_big_endian_p) | |
ebde3f62 | 435 | bfd_putb32 ((bfd_vma) * buf, f); |
841eff9e | 436 | else |
ebde3f62 | 437 | bfd_putl32 ((bfd_vma) * buf, f); |
841eff9e DE |
438 | break; |
439 | default: | |
440 | abort (); | |
441 | } | |
442 | #else | |
443 | memcpy (f, buf, byte_len); | |
444 | #endif | |
445 | ||
446 | /* Create any fixups. */ | |
447 | for (i = 0; i < num_fixups; ++i) | |
448 | { | |
defc70bf DE |
449 | fixS * fixP; |
450 | ||
841eff9e DE |
451 | /* Don't create fixups for these. That's done during relaxation. |
452 | We don't need to test for CGEN_INSN_RELAX as they can't get here | |
453 | (see above). */ | |
defc70bf DE |
454 | if (relax_p |
455 | && CGEN_INSN_ATTR (insn, CGEN_INSN_RELAXABLE) != 0 | |
841eff9e DE |
456 | && CGEN_OPERAND_ATTR (& CGEN_SYM (operand_table) [fixups[i].opindex], |
457 | CGEN_OPERAND_RELAX) != 0) | |
458 | continue; | |
459 | ||
460 | #ifndef md_cgen_record_fixup_exp | |
461 | #define md_cgen_record_fixup_exp cgen_record_fixup_exp | |
462 | #endif | |
463 | ||
defc70bf DE |
464 | fixP = md_cgen_record_fixup_exp (frag_now, f - frag_now->fr_literal, |
465 | insn, length, | |
466 | & CGEN_SYM (operand_table) [fixups[i].opindex], | |
467 | fixups[i].opinfo, | |
468 | & fixups[i].exp); | |
469 | if (result) | |
470 | result->fixups[i] = fixP; | |
841eff9e | 471 | } |
95effc2b | 472 | |
defc70bf DE |
473 | if (result) |
474 | { | |
475 | result->num_fixups = num_fixups; | |
476 | result->addr = f; | |
477 | } | |
841eff9e DE |
478 | } |
479 | ||
480 | /* Apply a fixup to the object code. This is called for all the | |
481 | fixups we generated by the call to fix_new_exp, above. In the call | |
482 | above we used a reloc code which was the largest legal reloc code | |
483 | plus the operand index. Here we undo that to recover the operand | |
484 | index. At this point all symbol values should be fully resolved, | |
485 | and we attempt to completely resolve the reloc. If we can not do | |
486 | that, we determine the correct reloc code and put it back in the fixup. */ | |
487 | ||
488 | /* FIXME: This function handles some of the fixups and bfd_install_relocation | |
489 | handles the rest. bfd_install_relocation (or some other bfd function) | |
490 | should handle them all. */ | |
491 | ||
492 | int | |
493 | cgen_md_apply_fix3 (fixP, valueP, seg) | |
ebde3f62 NC |
494 | fixS * fixP; |
495 | valueT * valueP; | |
496 | segT seg; | |
841eff9e | 497 | { |
48401fcf TT |
498 | char * where = fixP->fx_frag->fr_literal + fixP->fx_where; |
499 | valueT value; | |
841eff9e DE |
500 | |
501 | /* FIXME FIXME FIXME: The value we are passed in *valuep includes | |
502 | the symbol values. Since we are using BFD_ASSEMBLER, if we are | |
503 | doing this relocation the code in write.c is going to call | |
504 | bfd_install_relocation, which is also going to use the symbol | |
505 | value. That means that if the reloc is fully resolved we want to | |
506 | use *valuep since bfd_install_relocation is not being used. | |
507 | However, if the reloc is not fully resolved we do not want to use | |
508 | *valuep, and must use fx_offset instead. However, if the reloc | |
509 | is PC relative, we do want to use *valuep since it includes the | |
510 | result of md_pcrel_from. This is confusing. */ | |
511 | ||
512 | if (fixP->fx_addsy == (symbolS *) NULL) | |
513 | { | |
ebde3f62 | 514 | value = * valueP; |
841eff9e DE |
515 | fixP->fx_done = 1; |
516 | } | |
517 | else if (fixP->fx_pcrel) | |
ebde3f62 | 518 | value = * valueP; |
841eff9e DE |
519 | else |
520 | { | |
521 | value = fixP->fx_offset; | |
522 | if (fixP->fx_subsy != (symbolS *) NULL) | |
523 | { | |
524 | if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section) | |
525 | value -= S_GET_VALUE (fixP->fx_subsy); | |
526 | else | |
527 | { | |
528 | /* We don't actually support subtracting a symbol. */ | |
529 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
48401fcf | 530 | _("expression too complex")); |
841eff9e DE |
531 | } |
532 | } | |
533 | } | |
534 | ||
535 | if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) | |
536 | { | |
ebde3f62 NC |
537 | int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; |
538 | const CGEN_OPERAND * operand = & CGEN_SYM (operand_table) [opindex]; | |
539 | const char * errmsg; | |
841eff9e | 540 | bfd_reloc_code_real_type reloc_type; |
ebde3f62 NC |
541 | CGEN_FIELDS fields; |
542 | const CGEN_INSN * insn = (CGEN_INSN *) fixP->tc_fix_data.insn; | |
841eff9e DE |
543 | |
544 | /* If the reloc has been fully resolved finish the operand here. */ | |
545 | /* FIXME: This duplicates the capabilities of code in BFD. */ | |
546 | if (fixP->fx_done | |
547 | /* FIXME: If partial_inplace isn't set bfd_install_relocation won't | |
548 | finish the job. Testing for pcrel is a temporary hack. */ | |
549 | || fixP->fx_pcrel) | |
550 | { | |
ebde3f62 NC |
551 | CGEN_FIELDS_BITSIZE (& fields) = CGEN_INSN_BITSIZE (insn); |
552 | CGEN_SYM (set_operand) (opindex, & value, & fields); | |
48401fcf | 553 | errmsg = CGEN_SYM (insert_operand) (opindex, & fields, where); |
841eff9e DE |
554 | if (errmsg) |
555 | as_warn_where (fixP->fx_file, fixP->fx_line, "%s\n", errmsg); | |
841eff9e DE |
556 | } |
557 | ||
558 | if (fixP->fx_done) | |
559 | return 1; | |
560 | ||
561 | /* The operand isn't fully resolved. Determine a BFD reloc value | |
562 | based on the operand information and leave it to | |
563 | bfd_install_relocation. Note that this doesn't work when | |
564 | partial_inplace == false. */ | |
565 | ||
566 | reloc_type = CGEN_SYM (lookup_reloc) (insn, operand, fixP); | |
567 | if (reloc_type != BFD_RELOC_NONE) | |
568 | { | |
569 | fixP->fx_r_type = reloc_type; | |
570 | } | |
571 | else | |
572 | { | |
573 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
48401fcf | 574 | _("unresolved expression that must be resolved")); |
841eff9e DE |
575 | fixP->fx_done = 1; |
576 | return 1; | |
577 | } | |
578 | } | |
579 | else if (fixP->fx_done) | |
580 | { | |
581 | /* We're finished with this fixup. Install it because | |
582 | bfd_install_relocation won't be called to do it. */ | |
583 | switch (fixP->fx_r_type) | |
584 | { | |
585 | case BFD_RELOC_8: | |
586 | md_number_to_chars (where, value, 1); | |
587 | break; | |
588 | case BFD_RELOC_16: | |
589 | md_number_to_chars (where, value, 2); | |
590 | break; | |
591 | case BFD_RELOC_32: | |
592 | md_number_to_chars (where, value, 4); | |
593 | break; | |
594 | /* FIXME: later add support for 64 bits. */ | |
595 | default: | |
596 | abort (); | |
597 | } | |
598 | } | |
599 | else | |
600 | { | |
601 | /* bfd_install_relocation will be called to finish things up. */ | |
602 | } | |
603 | ||
604 | /* Tuck `value' away for use by tc_gen_reloc. | |
605 | See the comment describing fx_addnumber in write.h. | |
606 | This field is misnamed (or misused :-). */ | |
607 | fixP->fx_addnumber = value; | |
608 | ||
609 | return 1; | |
610 | } | |
611 | ||
612 | /* Translate internal representation of relocation info to BFD target format. | |
613 | ||
614 | FIXME: To what extent can we get all relevant targets to use this? */ | |
615 | ||
616 | arelent * | |
617 | cgen_tc_gen_reloc (section, fixP) | |
ebde3f62 NC |
618 | asection * section; |
619 | fixS * fixP; | |
841eff9e | 620 | { |
ebde3f62 | 621 | arelent * reloc; |
841eff9e | 622 | |
1002d8ed | 623 | reloc = (arelent *) bfd_alloc (stdoutput, sizeof (arelent)); |
841eff9e DE |
624 | |
625 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); | |
626 | if (reloc->howto == (reloc_howto_type *) NULL) | |
627 | { | |
628 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
48401fcf | 629 | _("internal error: can't export reloc type %d (`%s')"), |
841eff9e DE |
630 | fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type)); |
631 | return NULL; | |
632 | } | |
633 | ||
634 | assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); | |
635 | ||
ebde3f62 NC |
636 | reloc->sym_ptr_ptr = & fixP->fx_addsy->bsym; |
637 | reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; | |
638 | reloc->addend = fixP->fx_addnumber; | |
841eff9e DE |
639 | |
640 | return reloc; | |
641 | } |