Commit | Line | Data |
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a40cbfa3 | 1 | /* tc-ip2k.c -- Assembler for the Scenix IP2xxx. |
ebd1c875 | 2 | Copyright (C) 2000, 2002, 2003, 2005, 2006 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 | |
4b4da160 NC |
18 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, |
19 | Boston, MA 02110-1301, USA. */ | |
a40cbfa3 | 20 | |
a40cbfa3 | 21 | #include "as.h" |
a40cbfa3 NC |
22 | #include "subsegs.h" |
23 | #include "symcat.h" | |
24 | #include "opcodes/ip2k-desc.h" | |
25 | #include "opcodes/ip2k-opc.h" | |
26 | #include "cgen.h" | |
27 | #include "elf/common.h" | |
28 | #include "elf/ip2k.h" | |
29 | #include "libbfd.h" | |
30 | ||
31 | /* Structure to hold all of the different components describing | |
32 | an individual instruction. */ | |
33 | typedef struct | |
34 | { | |
35 | const CGEN_INSN * insn; | |
36 | const CGEN_INSN * orig_insn; | |
37 | CGEN_FIELDS fields; | |
38 | #if CGEN_INT_INSN_P | |
39 | CGEN_INSN_INT buffer [1]; | |
40 | #define INSN_VALUE(buf) (*(buf)) | |
41 | #else | |
42 | unsigned char buffer [CGEN_MAX_INSN_SIZE]; | |
43 | #define INSN_VALUE(buf) (buf) | |
44 | #endif | |
45 | char * addr; | |
46 | fragS * frag; | |
47 | int num_fixups; | |
48 | fixS * fixups [GAS_CGEN_MAX_FIXUPS]; | |
49 | int indices [MAX_OPERAND_INSTANCES]; | |
50 | } | |
51 | ip2k_insn; | |
52 | ||
53 | const char comment_chars[] = ";"; | |
54 | const char line_comment_chars[] = "#"; | |
55 | const char line_separator_chars[] = ""; | |
56 | const char EXP_CHARS[] = "eE"; | |
57 | const char FLT_CHARS[] = "dD"; | |
58 | ||
ea1562b3 NC |
59 | /* Flag to detect when switching to code section where insn alignment is |
60 | implied. */ | |
61 | static int force_code_align = 0; | |
62 | ||
63 | /* Mach selected from command line. */ | |
64 | static int ip2k_mach = 0; | |
65 | static unsigned ip2k_mach_bitmask = 0; | |
66 | ||
67 | ||
68 | static void | |
69 | ip2k_elf_section_rtn (int i) | |
70 | { | |
71 | obj_elf_section(i); | |
72 | ||
73 | if (force_code_align) | |
74 | { | |
75 | /* The s_align_ptwo function expects that we are just after a .align | |
76 | directive and it will either try and read the align value or stop | |
77 | if end of line so we must fake it out so it thinks we are at the | |
78 | end of the line. */ | |
79 | char *old_input_line_pointer = input_line_pointer; | |
80 | input_line_pointer = "\n"; | |
81 | s_align_ptwo (1); | |
82 | force_code_align = 0; | |
83 | /* Restore. */ | |
84 | input_line_pointer = old_input_line_pointer; | |
85 | } | |
86 | } | |
87 | ||
88 | static void | |
89 | ip2k_elf_section_text (int i) | |
90 | { | |
91 | char *old_input_line_pointer; | |
92 | obj_elf_text(i); | |
93 | ||
94 | /* the s_align_ptwo function expects that we are just after a .align | |
95 | directive and it will either try and read the align value or stop if | |
96 | end of line so we must fake it out so it thinks we are at the end of | |
97 | the line. */ | |
98 | old_input_line_pointer = input_line_pointer; | |
99 | input_line_pointer = "\n"; | |
100 | s_align_ptwo (1); | |
101 | force_code_align = 0; | |
102 | /* Restore. */ | |
103 | input_line_pointer = old_input_line_pointer; | |
104 | } | |
a40cbfa3 NC |
105 | |
106 | /* The target specific pseudo-ops which we support. */ | |
107 | const pseudo_typeS md_pseudo_table[] = | |
108 | { | |
a40cbfa3 NC |
109 | { "text", ip2k_elf_section_text, 0 }, |
110 | { "sect", ip2k_elf_section_rtn, 0 }, | |
111 | { NULL, NULL, 0 } | |
112 | }; | |
113 | ||
114 | \f | |
115 | ||
ea1562b3 NC |
116 | enum options |
117 | { | |
118 | OPTION_CPU_IP2022 = OPTION_MD_BASE, | |
119 | OPTION_CPU_IP2022EXT | |
120 | }; | |
a40cbfa3 NC |
121 | |
122 | struct option md_longopts[] = | |
123 | { | |
124 | { "mip2022", no_argument, NULL, OPTION_CPU_IP2022 }, | |
125 | { "mip2022ext", no_argument, NULL, OPTION_CPU_IP2022EXT }, | |
126 | { NULL, no_argument, NULL, 0 }, | |
127 | }; | |
128 | size_t md_longopts_size = sizeof (md_longopts); | |
129 | ||
130 | const char * md_shortopts = ""; | |
131 | ||
a40cbfa3 | 132 | int |
ea1562b3 | 133 | md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED) |
a40cbfa3 NC |
134 | { |
135 | switch (c) | |
136 | { | |
137 | case OPTION_CPU_IP2022: | |
138 | ip2k_mach = bfd_mach_ip2022; | |
139 | ip2k_mach_bitmask = 1 << MACH_IP2022; | |
140 | break; | |
141 | ||
142 | case OPTION_CPU_IP2022EXT: | |
143 | ip2k_mach = bfd_mach_ip2022ext; | |
144 | ip2k_mach_bitmask = 1 << MACH_IP2022EXT; | |
145 | break; | |
146 | ||
147 | default: | |
148 | return 0; | |
149 | } | |
150 | ||
151 | return 1; | |
152 | } | |
153 | ||
a40cbfa3 | 154 | void |
ea1562b3 | 155 | md_show_usage (FILE * stream) |
a40cbfa3 NC |
156 | { |
157 | fprintf (stream, _("IP2K specific command line options:\n")); | |
158 | fprintf (stream, _(" -mip2022 restrict to IP2022 insns \n")); | |
159 | fprintf (stream, _(" -mip2022ext permit extended IP2022 insn\n")); | |
160 | } | |
161 | ||
162 | \f | |
163 | void | |
ea1562b3 | 164 | md_begin (void) |
a40cbfa3 NC |
165 | { |
166 | /* Initialize the `cgen' interface. */ | |
167 | ||
168 | /* Set the machine number and endian. */ | |
169 | gas_cgen_cpu_desc = ip2k_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, | |
170 | ip2k_mach_bitmask, | |
171 | CGEN_CPU_OPEN_ENDIAN, | |
172 | CGEN_ENDIAN_BIG, | |
173 | CGEN_CPU_OPEN_END); | |
174 | ip2k_cgen_init_asm (gas_cgen_cpu_desc); | |
175 | ||
176 | /* This is a callback from cgen to gas to parse operands. */ | |
177 | cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand); | |
178 | ||
179 | /* Set the machine type. */ | |
180 | bfd_default_set_arch_mach (stdoutput, bfd_arch_ip2k, ip2k_mach); | |
181 | } | |
182 | ||
183 | ||
184 | void | |
ea1562b3 | 185 | md_assemble (char * str) |
a40cbfa3 NC |
186 | { |
187 | ip2k_insn insn; | |
188 | char * errmsg; | |
189 | ||
190 | /* Initialize GAS's cgen interface for a new instruction. */ | |
191 | gas_cgen_init_parse (); | |
192 | ||
193 | insn.insn = ip2k_cgen_assemble_insn | |
194 | (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg); | |
195 | ||
196 | if (!insn.insn) | |
197 | { | |
198 | as_bad ("%s", errmsg); | |
199 | return; | |
200 | } | |
201 | ||
202 | /* Check for special relocation required by SKIP instructions. */ | |
203 | if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_SKIPA)) | |
204 | /* Unconditional skip has a 1-bit relocation of the current pc, so | |
205 | that we emit either sb pcl.0 or snb pcl.0 depending on whether | |
206 | the PCL (pc + 2) >> 1 is odd or even. */ | |
207 | { | |
208 | enum cgen_parse_operand_result result_type; | |
2132e3a3 | 209 | bfd_vma value; |
a40cbfa3 | 210 | const char *curpc_plus_2 = ".+2"; |
64384dfd | 211 | const char *err; |
a40cbfa3 | 212 | |
64384dfd AM |
213 | err = cgen_parse_address (gas_cgen_cpu_desc, & curpc_plus_2, |
214 | IP2K_OPERAND_ADDR16CJP, | |
215 | BFD_RELOC_IP2K_PC_SKIP, | |
216 | & result_type, & value); | |
217 | if (err) | |
a40cbfa3 | 218 | { |
64384dfd | 219 | as_bad ("%s", err); |
a40cbfa3 NC |
220 | return; |
221 | } | |
222 | } | |
223 | ||
224 | /* Doesn't really matter what we pass for RELAX_P here. */ | |
225 | gas_cgen_finish_insn (insn.insn, insn.buffer, | |
226 | CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL); | |
227 | } | |
228 | ||
229 | valueT | |
ea1562b3 | 230 | md_section_align (segT segment, valueT size) |
a40cbfa3 NC |
231 | { |
232 | int align = bfd_get_section_alignment (stdoutput, segment); | |
233 | ||
234 | return ((size + (1 << align) - 1) & (-1 << align)); | |
235 | } | |
236 | ||
237 | ||
238 | symbolS * | |
ea1562b3 | 239 | md_undefined_symbol (char * name ATTRIBUTE_UNUSED) |
a40cbfa3 NC |
240 | { |
241 | return 0; | |
242 | } | |
243 | \f | |
244 | int | |
ea1562b3 NC |
245 | md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED, |
246 | segT segment ATTRIBUTE_UNUSED) | |
a40cbfa3 NC |
247 | { |
248 | as_fatal (_("md_estimate_size_before_relax\n")); | |
249 | return 1; | |
250 | } | |
251 | ||
252 | ||
253 | /* *fragP has been relaxed to its final size, and now needs to have | |
254 | the bytes inside it modified to conform to the new size. | |
255 | ||
256 | Called after relaxation is finished. | |
257 | fragP->fr_type == rs_machine_dependent. | |
258 | fragP->fr_subtype is the subtype of what the address relaxed to. */ | |
259 | ||
260 | void | |
ea1562b3 NC |
261 | md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED, |
262 | segT sec ATTRIBUTE_UNUSED, | |
263 | fragS * fragP ATTRIBUTE_UNUSED) | |
a40cbfa3 NC |
264 | { |
265 | } | |
266 | ||
267 | \f | |
268 | /* Functions concerning relocs. */ | |
269 | ||
270 | long | |
ea1562b3 | 271 | md_pcrel_from (fixS *fixP) |
a40cbfa3 NC |
272 | { |
273 | as_fatal (_("md_pcrel_from\n")); | |
274 | ||
275 | /* Return the address of the delay slot. */ | |
276 | return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address; | |
277 | } | |
278 | ||
279 | ||
280 | /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. | |
281 | Returns BFD_RELOC_NONE if no reloc type can be found. | |
282 | *FIXP may be modified if desired. */ | |
283 | ||
284 | bfd_reloc_code_real_type | |
ea1562b3 NC |
285 | md_cgen_lookup_reloc (const CGEN_INSN * insn ATTRIBUTE_UNUSED, |
286 | const CGEN_OPERAND * operand, | |
287 | fixS * fixP ATTRIBUTE_UNUSED) | |
a40cbfa3 NC |
288 | { |
289 | bfd_reloc_code_real_type result; | |
290 | ||
291 | result = BFD_RELOC_NONE; | |
292 | ||
293 | switch (operand->type) | |
294 | { | |
295 | case IP2K_OPERAND_FR: | |
296 | case IP2K_OPERAND_ADDR16L: | |
297 | case IP2K_OPERAND_ADDR16H: | |
298 | case IP2K_OPERAND_LIT8: | |
299 | /* These may have been processed at parse time. */ | |
300 | if (fixP->fx_cgen.opinfo != 0) | |
301 | result = fixP->fx_cgen.opinfo; | |
302 | fixP->fx_no_overflow = 1; | |
303 | break; | |
304 | ||
305 | case IP2K_OPERAND_ADDR16CJP: | |
306 | result = fixP->fx_cgen.opinfo; | |
307 | if (result == 0 || result == BFD_RELOC_NONE) | |
308 | result = BFD_RELOC_IP2K_ADDR16CJP; | |
309 | fixP->fx_no_overflow = 1; | |
310 | break; | |
311 | ||
312 | case IP2K_OPERAND_ADDR16P: | |
313 | result = BFD_RELOC_IP2K_PAGE3; | |
314 | fixP->fx_no_overflow = 1; | |
315 | break; | |
316 | ||
317 | default: | |
318 | result = BFD_RELOC_NONE; | |
319 | break; | |
320 | } | |
321 | ||
322 | return result; | |
323 | } | |
324 | ||
325 | ||
326 | /* Write a value out to the object file, using the appropriate endianness. */ | |
327 | ||
328 | void | |
ea1562b3 | 329 | md_number_to_chars (char * buf, valueT val, int n) |
a40cbfa3 NC |
330 | { |
331 | number_to_chars_bigendian (buf, val, n); | |
332 | } | |
333 | ||
334 | /* Turn a string in input_line_pointer into a floating point constant of type | |
335 | type, and store the appropriate bytes in *litP. The number of LITTLENUMS | |
336 | emitted is stored in *sizeP . An error message is returned, or NULL on | |
337 | OK. */ | |
338 | ||
339 | /* Equal to MAX_PRECISION in atof-ieee.c */ | |
340 | #define MAX_LITTLENUMS 6 | |
341 | ||
342 | char * | |
ea1562b3 | 343 | md_atof (int type, char * litP, int * sizeP) |
a40cbfa3 NC |
344 | { |
345 | int prec; | |
346 | LITTLENUM_TYPE words [MAX_LITTLENUMS]; | |
347 | LITTLENUM_TYPE *wordP; | |
348 | char * t; | |
a40cbfa3 NC |
349 | |
350 | switch (type) | |
351 | { | |
352 | case 'f': | |
353 | case 'F': | |
354 | case 's': | |
355 | case 'S': | |
356 | prec = 2; | |
357 | break; | |
358 | ||
359 | case 'd': | |
360 | case 'D': | |
361 | case 'r': | |
362 | case 'R': | |
363 | prec = 4; | |
364 | break; | |
365 | ||
366 | /* FIXME: Some targets allow other format chars for bigger sizes here. */ | |
367 | ||
368 | default: | |
369 | * sizeP = 0; | |
370 | return _("Bad call to md_atof()"); | |
371 | } | |
372 | ||
373 | t = atof_ieee (input_line_pointer, type, words); | |
374 | if (t) | |
375 | input_line_pointer = t; | |
376 | * sizeP = prec * sizeof (LITTLENUM_TYPE); | |
377 | ||
378 | /* This loops outputs the LITTLENUMs in REVERSE order; in accord with | |
379 | the ip2k endianness. */ | |
380 | for (wordP = words; prec--;) | |
381 | { | |
382 | md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE)); | |
383 | litP += sizeof (LITTLENUM_TYPE); | |
384 | } | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | ||
390 | /* See whether we need to force a relocation into the output file. | |
391 | Force most of them, since the linker's bfd relocation engine | |
392 | understands range limits better than gas' cgen fixup engine. | |
393 | Consider the case of a fixup intermediate value being larger than | |
394 | the instruction it will be eventually encoded within. */ | |
395 | ||
396 | int | |
ea1562b3 | 397 | ip2k_force_relocation (fixS * fix) |
a40cbfa3 NC |
398 | { |
399 | switch (fix->fx_r_type) | |
400 | { | |
a40cbfa3 NC |
401 | case BFD_RELOC_IP2K_FR9: |
402 | case BFD_RELOC_IP2K_FR_OFFSET: | |
403 | case BFD_RELOC_IP2K_BANK: | |
404 | case BFD_RELOC_IP2K_ADDR16CJP: | |
405 | case BFD_RELOC_IP2K_PAGE3: | |
406 | case BFD_RELOC_IP2K_LO8DATA: | |
407 | case BFD_RELOC_IP2K_HI8DATA: | |
408 | case BFD_RELOC_IP2K_EX8DATA: | |
409 | case BFD_RELOC_IP2K_LO8INSN: | |
410 | case BFD_RELOC_IP2K_HI8INSN: | |
411 | case BFD_RELOC_IP2K_PC_SKIP: | |
412 | case BFD_RELOC_IP2K_TEXT: | |
413 | return 1; | |
414 | ||
415 | case BFD_RELOC_16: | |
a161fe53 | 416 | if (fix->fx_subsy && S_IS_DEFINED (fix->fx_subsy) |
a40cbfa3 NC |
417 | && fix->fx_addsy && S_IS_DEFINED (fix->fx_addsy) |
418 | && (S_GET_SEGMENT (fix->fx_addsy)->flags & SEC_CODE)) | |
419 | { | |
420 | fix->fx_r_type = BFD_RELOC_IP2K_TEXT; | |
421 | return 0; | |
422 | } | |
a161fe53 | 423 | break; |
a40cbfa3 NC |
424 | |
425 | default: | |
a161fe53 | 426 | break; |
a40cbfa3 | 427 | } |
a161fe53 | 428 | |
ae6063d4 | 429 | return generic_force_reloc (fix); |
a40cbfa3 NC |
430 | } |
431 | ||
432 | void | |
55cf6793 | 433 | ip2k_apply_fix (fixS *fixP, valueT *valueP, segT seg) |
a40cbfa3 NC |
434 | { |
435 | if (fixP->fx_r_type == BFD_RELOC_IP2K_TEXT | |
436 | && ! fixP->fx_addsy | |
437 | && ! fixP->fx_subsy) | |
438 | { | |
ea1562b3 | 439 | *valueP = ((int)(* valueP)) / 2; |
a40cbfa3 NC |
440 | fixP->fx_r_type = BFD_RELOC_16; |
441 | } | |
442 | else if (fixP->fx_r_type == BFD_RELOC_UNUSED + IP2K_OPERAND_FR) | |
443 | { | |
444 | /* Must be careful when we are fixing up an FR. We could be | |
445 | fixing up an offset to (SP) or (DP) in which case we don't | |
446 | want to step on the top 2 bits of the FR operand. The | |
55cf6793 | 447 | gas_cgen_md_apply_fix doesn't know any better and overwrites |
a40cbfa3 NC |
448 | the entire operand. We counter this by adding the bits |
449 | to the new value. */ | |
450 | char *where = fixP->fx_frag->fr_literal + fixP->fx_where; | |
451 | ||
452 | /* Canonical name, since used a lot. */ | |
453 | CGEN_CPU_DESC cd = gas_cgen_cpu_desc; | |
454 | CGEN_INSN_INT insn_value | |
2132e3a3 | 455 | = cgen_get_insn_value (cd, (unsigned char *) where, |
a40cbfa3 NC |
456 | CGEN_INSN_BITSIZE (fixP->fx_cgen.insn)); |
457 | /* Preserve (DP) or (SP) specification. */ | |
458 | *valueP += (insn_value & 0x180); | |
459 | } | |
460 | ||
55cf6793 | 461 | gas_cgen_md_apply_fix (fixP, valueP, seg); |
a40cbfa3 NC |
462 | } |
463 | ||
464 | int | |
ea1562b3 NC |
465 | ip2k_elf_section_flags (int flags, |
466 | int attr ATTRIBUTE_UNUSED, | |
467 | int type ATTRIBUTE_UNUSED) | |
a40cbfa3 NC |
468 | { |
469 | /* This is used to detect when the section changes to an executable section. | |
470 | This function is called by the elf section processing. When we note an | |
471 | executable section specifier we set an internal flag to denote when | |
472 | word alignment should be forced. */ | |
473 | if (flags & SEC_CODE) | |
474 | force_code_align = 1; | |
475 | ||
476 | return flags; | |
477 | } | |
478 |