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a40cbfa3 | 1 | /* tc-ip2k.c -- Assembler for the Scenix IP2xxx. |
ae6063d4 | 2 | Copyright (C) 2000, 2002, 2003 Free Software Foundation. |
a40cbfa3 NC |
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 | |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include <stdio.h> | |
a40cbfa3 | 22 | #include "as.h" |
a40cbfa3 NC |
23 | #include "subsegs.h" |
24 | #include "symcat.h" | |
25 | #include "opcodes/ip2k-desc.h" | |
26 | #include "opcodes/ip2k-opc.h" | |
27 | #include "cgen.h" | |
28 | #include "elf/common.h" | |
29 | #include "elf/ip2k.h" | |
30 | #include "libbfd.h" | |
31 | ||
32 | /* Structure to hold all of the different components describing | |
33 | an individual instruction. */ | |
34 | typedef struct | |
35 | { | |
36 | const CGEN_INSN * insn; | |
37 | const CGEN_INSN * orig_insn; | |
38 | CGEN_FIELDS fields; | |
39 | #if CGEN_INT_INSN_P | |
40 | CGEN_INSN_INT buffer [1]; | |
41 | #define INSN_VALUE(buf) (*(buf)) | |
42 | #else | |
43 | unsigned char buffer [CGEN_MAX_INSN_SIZE]; | |
44 | #define INSN_VALUE(buf) (buf) | |
45 | #endif | |
46 | char * addr; | |
47 | fragS * frag; | |
48 | int num_fixups; | |
49 | fixS * fixups [GAS_CGEN_MAX_FIXUPS]; | |
50 | int indices [MAX_OPERAND_INSTANCES]; | |
51 | } | |
52 | ip2k_insn; | |
53 | ||
54 | const char comment_chars[] = ";"; | |
55 | const char line_comment_chars[] = "#"; | |
56 | const char line_separator_chars[] = ""; | |
57 | const char EXP_CHARS[] = "eE"; | |
58 | const char FLT_CHARS[] = "dD"; | |
59 | ||
60 | static void ip2k_elf_section_text (int); | |
61 | static void ip2k_elf_section_rtn (int); | |
62 | ||
63 | /* The target specific pseudo-ops which we support. */ | |
64 | const pseudo_typeS md_pseudo_table[] = | |
65 | { | |
a40cbfa3 NC |
66 | { "text", ip2k_elf_section_text, 0 }, |
67 | { "sect", ip2k_elf_section_rtn, 0 }, | |
68 | { NULL, NULL, 0 } | |
69 | }; | |
70 | ||
71 | \f | |
72 | ||
73 | #define OPTION_CPU_IP2022 (OPTION_MD_BASE) | |
74 | #define OPTION_CPU_IP2022EXT (OPTION_MD_BASE+1) | |
75 | ||
76 | struct option md_longopts[] = | |
77 | { | |
78 | { "mip2022", no_argument, NULL, OPTION_CPU_IP2022 }, | |
79 | { "mip2022ext", no_argument, NULL, OPTION_CPU_IP2022EXT }, | |
80 | { NULL, no_argument, NULL, 0 }, | |
81 | }; | |
82 | size_t md_longopts_size = sizeof (md_longopts); | |
83 | ||
84 | const char * md_shortopts = ""; | |
85 | ||
86 | /* Flag to detect when switching to code section where insn alignment is | |
87 | implied. */ | |
88 | static int force_code_align = 0; | |
89 | ||
90 | /* Mach selected from command line. */ | |
91 | int ip2k_mach = 0; | |
92 | unsigned ip2k_mach_bitmask = 0; | |
93 | ||
94 | int | |
95 | md_parse_option (c, arg) | |
96 | int c ATTRIBUTE_UNUSED; | |
97 | char * arg ATTRIBUTE_UNUSED; | |
98 | { | |
99 | switch (c) | |
100 | { | |
101 | case OPTION_CPU_IP2022: | |
102 | ip2k_mach = bfd_mach_ip2022; | |
103 | ip2k_mach_bitmask = 1 << MACH_IP2022; | |
104 | break; | |
105 | ||
106 | case OPTION_CPU_IP2022EXT: | |
107 | ip2k_mach = bfd_mach_ip2022ext; | |
108 | ip2k_mach_bitmask = 1 << MACH_IP2022EXT; | |
109 | break; | |
110 | ||
111 | default: | |
112 | return 0; | |
113 | } | |
114 | ||
115 | return 1; | |
116 | } | |
117 | ||
118 | ||
119 | void | |
120 | md_show_usage (stream) | |
121 | FILE * stream; | |
122 | { | |
123 | fprintf (stream, _("IP2K specific command line options:\n")); | |
124 | fprintf (stream, _(" -mip2022 restrict to IP2022 insns \n")); | |
125 | fprintf (stream, _(" -mip2022ext permit extended IP2022 insn\n")); | |
126 | } | |
127 | ||
128 | \f | |
129 | void | |
130 | md_begin () | |
131 | { | |
132 | /* Initialize the `cgen' interface. */ | |
133 | ||
134 | /* Set the machine number and endian. */ | |
135 | gas_cgen_cpu_desc = ip2k_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, | |
136 | ip2k_mach_bitmask, | |
137 | CGEN_CPU_OPEN_ENDIAN, | |
138 | CGEN_ENDIAN_BIG, | |
139 | CGEN_CPU_OPEN_END); | |
140 | ip2k_cgen_init_asm (gas_cgen_cpu_desc); | |
141 | ||
142 | /* This is a callback from cgen to gas to parse operands. */ | |
143 | cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand); | |
144 | ||
145 | /* Set the machine type. */ | |
146 | bfd_default_set_arch_mach (stdoutput, bfd_arch_ip2k, ip2k_mach); | |
147 | } | |
148 | ||
149 | ||
150 | void | |
151 | md_assemble (str) | |
152 | char * str; | |
153 | { | |
154 | ip2k_insn insn; | |
155 | char * errmsg; | |
156 | ||
157 | /* Initialize GAS's cgen interface for a new instruction. */ | |
158 | gas_cgen_init_parse (); | |
159 | ||
160 | insn.insn = ip2k_cgen_assemble_insn | |
161 | (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg); | |
162 | ||
163 | if (!insn.insn) | |
164 | { | |
165 | as_bad ("%s", errmsg); | |
166 | return; | |
167 | } | |
168 | ||
169 | /* Check for special relocation required by SKIP instructions. */ | |
170 | if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_SKIPA)) | |
171 | /* Unconditional skip has a 1-bit relocation of the current pc, so | |
172 | that we emit either sb pcl.0 or snb pcl.0 depending on whether | |
173 | the PCL (pc + 2) >> 1 is odd or even. */ | |
174 | { | |
175 | enum cgen_parse_operand_result result_type; | |
176 | long value; | |
177 | const char *curpc_plus_2 = ".+2"; | |
64384dfd | 178 | const char *err; |
a40cbfa3 | 179 | |
64384dfd AM |
180 | err = cgen_parse_address (gas_cgen_cpu_desc, & curpc_plus_2, |
181 | IP2K_OPERAND_ADDR16CJP, | |
182 | BFD_RELOC_IP2K_PC_SKIP, | |
183 | & result_type, & value); | |
184 | if (err) | |
a40cbfa3 | 185 | { |
64384dfd | 186 | as_bad ("%s", err); |
a40cbfa3 NC |
187 | return; |
188 | } | |
189 | } | |
190 | ||
191 | /* Doesn't really matter what we pass for RELAX_P here. */ | |
192 | gas_cgen_finish_insn (insn.insn, insn.buffer, | |
193 | CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL); | |
194 | } | |
195 | ||
196 | valueT | |
197 | md_section_align (segment, size) | |
198 | segT segment; | |
199 | valueT size; | |
200 | { | |
201 | int align = bfd_get_section_alignment (stdoutput, segment); | |
202 | ||
203 | return ((size + (1 << align) - 1) & (-1 << align)); | |
204 | } | |
205 | ||
206 | ||
207 | symbolS * | |
208 | md_undefined_symbol (name) | |
209 | char * name ATTRIBUTE_UNUSED; | |
210 | { | |
211 | return 0; | |
212 | } | |
213 | \f | |
214 | int | |
215 | md_estimate_size_before_relax (fragP, segment) | |
216 | fragS * fragP ATTRIBUTE_UNUSED; | |
217 | segT segment ATTRIBUTE_UNUSED; | |
218 | { | |
219 | as_fatal (_("md_estimate_size_before_relax\n")); | |
220 | return 1; | |
221 | } | |
222 | ||
223 | ||
224 | /* *fragP has been relaxed to its final size, and now needs to have | |
225 | the bytes inside it modified to conform to the new size. | |
226 | ||
227 | Called after relaxation is finished. | |
228 | fragP->fr_type == rs_machine_dependent. | |
229 | fragP->fr_subtype is the subtype of what the address relaxed to. */ | |
230 | ||
231 | void | |
232 | md_convert_frag (abfd, sec, fragP) | |
233 | bfd * abfd ATTRIBUTE_UNUSED; | |
234 | segT sec ATTRIBUTE_UNUSED; | |
235 | fragS * fragP ATTRIBUTE_UNUSED; | |
236 | { | |
237 | } | |
238 | ||
239 | \f | |
240 | /* Functions concerning relocs. */ | |
241 | ||
242 | long | |
243 | md_pcrel_from (fixP) | |
244 | fixS *fixP; | |
245 | { | |
246 | as_fatal (_("md_pcrel_from\n")); | |
247 | ||
248 | /* Return the address of the delay slot. */ | |
249 | return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address; | |
250 | } | |
251 | ||
252 | ||
253 | /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. | |
254 | Returns BFD_RELOC_NONE if no reloc type can be found. | |
255 | *FIXP may be modified if desired. */ | |
256 | ||
257 | bfd_reloc_code_real_type | |
258 | md_cgen_lookup_reloc (insn, operand, fixP) | |
259 | const CGEN_INSN * insn ATTRIBUTE_UNUSED; | |
260 | const CGEN_OPERAND * operand; | |
261 | fixS * fixP ATTRIBUTE_UNUSED; | |
262 | { | |
263 | bfd_reloc_code_real_type result; | |
264 | ||
265 | result = BFD_RELOC_NONE; | |
266 | ||
267 | switch (operand->type) | |
268 | { | |
269 | case IP2K_OPERAND_FR: | |
270 | case IP2K_OPERAND_ADDR16L: | |
271 | case IP2K_OPERAND_ADDR16H: | |
272 | case IP2K_OPERAND_LIT8: | |
273 | /* These may have been processed at parse time. */ | |
274 | if (fixP->fx_cgen.opinfo != 0) | |
275 | result = fixP->fx_cgen.opinfo; | |
276 | fixP->fx_no_overflow = 1; | |
277 | break; | |
278 | ||
279 | case IP2K_OPERAND_ADDR16CJP: | |
280 | result = fixP->fx_cgen.opinfo; | |
281 | if (result == 0 || result == BFD_RELOC_NONE) | |
282 | result = BFD_RELOC_IP2K_ADDR16CJP; | |
283 | fixP->fx_no_overflow = 1; | |
284 | break; | |
285 | ||
286 | case IP2K_OPERAND_ADDR16P: | |
287 | result = BFD_RELOC_IP2K_PAGE3; | |
288 | fixP->fx_no_overflow = 1; | |
289 | break; | |
290 | ||
291 | default: | |
292 | result = BFD_RELOC_NONE; | |
293 | break; | |
294 | } | |
295 | ||
296 | return result; | |
297 | } | |
298 | ||
299 | ||
300 | /* Write a value out to the object file, using the appropriate endianness. */ | |
301 | ||
302 | void | |
303 | md_number_to_chars (buf, val, n) | |
304 | char * buf; | |
305 | valueT val; | |
306 | int n; | |
307 | { | |
308 | number_to_chars_bigendian (buf, val, n); | |
309 | } | |
310 | ||
311 | /* Turn a string in input_line_pointer into a floating point constant of type | |
312 | type, and store the appropriate bytes in *litP. The number of LITTLENUMS | |
313 | emitted is stored in *sizeP . An error message is returned, or NULL on | |
314 | OK. */ | |
315 | ||
316 | /* Equal to MAX_PRECISION in atof-ieee.c */ | |
317 | #define MAX_LITTLENUMS 6 | |
318 | ||
319 | char * | |
320 | md_atof (type, litP, sizeP) | |
321 | char type; | |
322 | char * litP; | |
323 | int * sizeP; | |
324 | { | |
325 | int prec; | |
326 | LITTLENUM_TYPE words [MAX_LITTLENUMS]; | |
327 | LITTLENUM_TYPE *wordP; | |
328 | char * t; | |
a40cbfa3 NC |
329 | |
330 | switch (type) | |
331 | { | |
332 | case 'f': | |
333 | case 'F': | |
334 | case 's': | |
335 | case 'S': | |
336 | prec = 2; | |
337 | break; | |
338 | ||
339 | case 'd': | |
340 | case 'D': | |
341 | case 'r': | |
342 | case 'R': | |
343 | prec = 4; | |
344 | break; | |
345 | ||
346 | /* FIXME: Some targets allow other format chars for bigger sizes here. */ | |
347 | ||
348 | default: | |
349 | * sizeP = 0; | |
350 | return _("Bad call to md_atof()"); | |
351 | } | |
352 | ||
353 | t = atof_ieee (input_line_pointer, type, words); | |
354 | if (t) | |
355 | input_line_pointer = t; | |
356 | * sizeP = prec * sizeof (LITTLENUM_TYPE); | |
357 | ||
358 | /* This loops outputs the LITTLENUMs in REVERSE order; in accord with | |
359 | the ip2k endianness. */ | |
360 | for (wordP = words; prec--;) | |
361 | { | |
362 | md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE)); | |
363 | litP += sizeof (LITTLENUM_TYPE); | |
364 | } | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | ||
370 | /* See whether we need to force a relocation into the output file. | |
371 | Force most of them, since the linker's bfd relocation engine | |
372 | understands range limits better than gas' cgen fixup engine. | |
373 | Consider the case of a fixup intermediate value being larger than | |
374 | the instruction it will be eventually encoded within. */ | |
375 | ||
376 | int | |
377 | ip2k_force_relocation (fix) | |
378 | fixS * fix; | |
379 | { | |
380 | switch (fix->fx_r_type) | |
381 | { | |
a40cbfa3 NC |
382 | case BFD_RELOC_IP2K_FR9: |
383 | case BFD_RELOC_IP2K_FR_OFFSET: | |
384 | case BFD_RELOC_IP2K_BANK: | |
385 | case BFD_RELOC_IP2K_ADDR16CJP: | |
386 | case BFD_RELOC_IP2K_PAGE3: | |
387 | case BFD_RELOC_IP2K_LO8DATA: | |
388 | case BFD_RELOC_IP2K_HI8DATA: | |
389 | case BFD_RELOC_IP2K_EX8DATA: | |
390 | case BFD_RELOC_IP2K_LO8INSN: | |
391 | case BFD_RELOC_IP2K_HI8INSN: | |
392 | case BFD_RELOC_IP2K_PC_SKIP: | |
393 | case BFD_RELOC_IP2K_TEXT: | |
394 | return 1; | |
395 | ||
396 | case BFD_RELOC_16: | |
a161fe53 | 397 | if (fix->fx_subsy && S_IS_DEFINED (fix->fx_subsy) |
a40cbfa3 NC |
398 | && fix->fx_addsy && S_IS_DEFINED (fix->fx_addsy) |
399 | && (S_GET_SEGMENT (fix->fx_addsy)->flags & SEC_CODE)) | |
400 | { | |
401 | fix->fx_r_type = BFD_RELOC_IP2K_TEXT; | |
402 | return 0; | |
403 | } | |
a161fe53 | 404 | break; |
a40cbfa3 NC |
405 | |
406 | default: | |
a161fe53 | 407 | break; |
a40cbfa3 | 408 | } |
a161fe53 | 409 | |
ae6063d4 | 410 | return generic_force_reloc (fix); |
a40cbfa3 NC |
411 | } |
412 | ||
413 | void | |
414 | ip2k_apply_fix3 (fixP, valueP, seg) | |
415 | fixS *fixP; | |
416 | valueT *valueP; | |
417 | segT seg; | |
418 | { | |
419 | if (fixP->fx_r_type == BFD_RELOC_IP2K_TEXT | |
420 | && ! fixP->fx_addsy | |
421 | && ! fixP->fx_subsy) | |
422 | { | |
423 | *valueP = ((int)(*valueP)) / 2; | |
424 | fixP->fx_r_type = BFD_RELOC_16; | |
425 | } | |
426 | else if (fixP->fx_r_type == BFD_RELOC_UNUSED + IP2K_OPERAND_FR) | |
427 | { | |
428 | /* Must be careful when we are fixing up an FR. We could be | |
429 | fixing up an offset to (SP) or (DP) in which case we don't | |
430 | want to step on the top 2 bits of the FR operand. The | |
431 | gas_cgen_md_apply_fix3 doesn't know any better and overwrites | |
432 | the entire operand. We counter this by adding the bits | |
433 | to the new value. */ | |
434 | char *where = fixP->fx_frag->fr_literal + fixP->fx_where; | |
435 | ||
436 | /* Canonical name, since used a lot. */ | |
437 | CGEN_CPU_DESC cd = gas_cgen_cpu_desc; | |
438 | CGEN_INSN_INT insn_value | |
439 | = cgen_get_insn_value (cd, where, | |
440 | CGEN_INSN_BITSIZE (fixP->fx_cgen.insn)); | |
441 | /* Preserve (DP) or (SP) specification. */ | |
442 | *valueP += (insn_value & 0x180); | |
443 | } | |
444 | ||
445 | gas_cgen_md_apply_fix3 (fixP, valueP, seg); | |
446 | } | |
447 | ||
448 | int | |
449 | ip2k_elf_section_flags (flags, attr, type) | |
450 | int flags; | |
451 | int attr ATTRIBUTE_UNUSED; | |
452 | int type ATTRIBUTE_UNUSED; | |
453 | { | |
454 | /* This is used to detect when the section changes to an executable section. | |
455 | This function is called by the elf section processing. When we note an | |
456 | executable section specifier we set an internal flag to denote when | |
457 | word alignment should be forced. */ | |
458 | if (flags & SEC_CODE) | |
459 | force_code_align = 1; | |
460 | ||
461 | return flags; | |
462 | } | |
463 | ||
464 | static void | |
465 | ip2k_elf_section_rtn (int i) | |
466 | { | |
467 | obj_elf_section(i); | |
468 | ||
469 | if (force_code_align) | |
470 | { | |
471 | /* The s_align_ptwo function expects that we are just after a .align | |
472 | directive and it will either try and read the align value or stop | |
473 | if end of line so we must fake it out so it thinks we are at the | |
474 | end of the line. */ | |
475 | char *old_input_line_pointer = input_line_pointer; | |
476 | input_line_pointer = "\n"; | |
477 | s_align_ptwo (1); | |
478 | force_code_align = 0; | |
479 | /* Restore. */ | |
480 | input_line_pointer = old_input_line_pointer; | |
481 | } | |
482 | } | |
483 | ||
484 | static void | |
485 | ip2k_elf_section_text (int i) | |
486 | { | |
487 | char *old_input_line_pointer; | |
488 | obj_elf_text(i); | |
489 | ||
490 | /* the s_align_ptwo function expects that we are just after a .align | |
491 | directive and it will either try and read the align value or stop if | |
492 | end of line so we must fake it out so it thinks we are at the end of | |
493 | the line. */ | |
494 | old_input_line_pointer = input_line_pointer; | |
495 | input_line_pointer = "\n"; | |
496 | s_align_ptwo (1); | |
497 | force_code_align = 0; | |
498 | /* Restore. */ | |
499 | input_line_pointer = old_input_line_pointer; | |
500 | } |