1 /* tc-fr30.c -- Assembler for the Fujitsu FR30.
2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2005
3 Free Software Foundation, Inc.
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
19 the Free Software Foundation, 51 Franklin Street - Fifth Floor,
20 Boston, MA 02110-1301, USA. */
21
22 #include <stdio.h>
23 #include "as.h"
24 #include "safe-ctype.h"
25 #include "subsegs.h"
26 #include "symcat.h"
27 #include "opcodes/fr30-desc.h"
28 #include "opcodes/fr30-opc.h"
29 #include "cgen.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 fr30_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
59 #define FR30_SHORTOPTS ""
60 const char * md_shortopts = FR30_SHORTOPTS;
61
62 struct option md_longopts[] =
63 {
64 {NULL, no_argument, NULL, 0}
65 };
66 size_t md_longopts_size = sizeof (md_longopts);
67
68 int
md_parse_option(int c ATTRIBUTE_UNUSED,char * arg ATTRIBUTE_UNUSED)69 md_parse_option (int c ATTRIBUTE_UNUSED,
70 char *arg ATTRIBUTE_UNUSED)
71 {
72 switch (c)
73 {
74 default:
75 return 0;
76 }
77 return 1;
78 }
79
80 void
md_show_usage(FILE * stream)81 md_show_usage (FILE * stream)
82 {
83 fprintf (stream, _(" FR30 specific command line options:\n"));
84 }
85
86 /* The target specific pseudo-ops which we support. */
87 const pseudo_typeS md_pseudo_table[] =
88 {
89 { "word", cons, 4 },
90 { NULL, NULL, 0 }
91 };
92
93
94 void
md_begin(void)95 md_begin (void)
96 {
97 /* Initialize the `cgen' interface. */
98
99 /* Set the machine number and endian. */
100 gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
101 CGEN_CPU_OPEN_ENDIAN,
102 CGEN_ENDIAN_BIG,
103 CGEN_CPU_OPEN_END);
104 fr30_cgen_init_asm (gas_cgen_cpu_desc);
105
106 /* This is a callback from cgen to gas to parse operands. */
107 cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
108 }
109
110 void
md_assemble(char * str)111 md_assemble (char *str)
112 {
113 static int last_insn_had_delay_slot = 0;
114 fr30_insn insn;
115 char *errmsg;
116
117 /* Initialize GAS's cgen interface for a new instruction. */
118 gas_cgen_init_parse ();
119
120 insn.insn = fr30_cgen_assemble_insn
121 (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
122
123 if (!insn.insn)
124 {
125 as_bad (errmsg);
126 return;
127 }
128
129 /* Doesn't really matter what we pass for RELAX_P here. */
130 gas_cgen_finish_insn (insn.insn, insn.buffer,
131 CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
132
133 /* Warn about invalid insns in delay slots. */
134 if (last_insn_had_delay_slot
135 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT))
136 as_warn (_("Instruction %s not allowed in a delay slot."),
137 CGEN_INSN_NAME (insn.insn));
138
139 last_insn_had_delay_slot
140 = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
141 }
142
143 /* The syntax in the manual says constants begin with '#'.
144 We just ignore it. */
145
146 void
md_operand(expressionS * expressionP)147 md_operand (expressionS * expressionP)
148 {
149 if (* input_line_pointer == '#')
150 {
151 input_line_pointer ++;
152 expression (expressionP);
153 }
154 }
155
156 valueT
md_section_align(segT segment,valueT size)157 md_section_align (segT segment, valueT size)
158 {
159 int align = bfd_get_section_alignment (stdoutput, segment);
160
161 return ((size + (1 << align) - 1) & (-1 << align));
162 }
163
164 symbolS *
md_undefined_symbol(char * name ATTRIBUTE_UNUSED)165 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
166 {
167 return NULL;
168 }
169
170 /* Interface to relax_segment. */
171
172 /* FIXME: Build table by hand, get it working, then machine generate. */
173
174 const relax_typeS md_relax_table[] =
175 {
176 /* The fields are:
177 1) most positive reach of this state,
178 2) most negative reach of this state,
179 3) how many bytes this mode will add to the size of the current frag
180 4) which index into the table to try if we can't fit into this one. */
181
182 /* The first entry must be unused because an `rlx_more' value of zero ends
183 each list. */
184 {1, 1, 0, 0},
185
186 /* The displacement used by GAS is from the end of the 2 byte insn,
187 so we subtract 2 from the following. */
188 /* 16 bit insn, 8 bit disp -> 10 bit range.
189 This doesn't handle a branch in the right slot at the border:
190 the "& -4" isn't taken into account. It's not important enough to
191 complicate things over it, so we subtract an extra 2 (or + 2 in -ve
192 case). */
193 {511 - 2 - 2, -512 - 2 + 2, 0, 2 },
194 /* 32 bit insn, 24 bit disp -> 26 bit range. */
195 {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
196 /* Same thing, but with leading nop for alignment. */
197 {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
198 };
199
200 /* Return an initial guess of the length by which a fragment must grow to
201 hold a branch to reach its destination.
202 Also updates fr_type/fr_subtype as necessary.
203
204 Called just before doing relaxation.
205 Any symbol that is now undefined will not become defined.
206 The guess for fr_var is ACTUALLY the growth beyond fr_fix.
207 Whatever we do to grow fr_fix or fr_var contributes to our returned value.
208 Although it may not be explicit in the frag, pretend fr_var starts with a
209 0 value. */
210
211 int
md_estimate_size_before_relax(fragS * fragP,segT segment)212 md_estimate_size_before_relax (fragS * fragP, segT segment)
213 {
214 /* The only thing we have to handle here are symbols outside of the
215 current segment. They may be undefined or in a different segment in
216 which case linker scripts may place them anywhere.
217 However, we can't finish the fragment here and emit the reloc as insn
218 alignment requirements may move the insn about. */
219
220 if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
221 {
222 /* The symbol is undefined in this segment.
223 Change the relaxation subtype to the max allowable and leave
224 all further handling to md_convert_frag. */
225 fragP->fr_subtype = 2;
226
227 {
228 const CGEN_INSN * insn;
229 int i;
230
231 /* Update the recorded insn.
232 Fortunately we don't have to look very far.
233 FIXME: Change this to record in the instruction the next higher
234 relaxable insn to use. */
235 for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
236 {
237 if ((strcmp (CGEN_INSN_MNEMONIC (insn),
238 CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
239 == 0)
240 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED))
241 break;
242 }
243 if (i == 4)
244 abort ();
245
246 fragP->fr_cgen.insn = insn;
247 return 2;
248 }
249 }
250
251 /* Return the size of the variable part of the frag. */
252 return md_relax_table[fragP->fr_subtype].rlx_length;
253 }
254
255 /* *fragP has been relaxed to its final size, and now needs to have
256 the bytes inside it modified to conform to the new size.
257
258 Called after relaxation is finished.
259 fragP->fr_type == rs_machine_dependent.
260 fragP->fr_subtype is the subtype of what the address relaxed to. */
261
262 void
md_convert_frag(bfd * abfd ATTRIBUTE_UNUSED,segT sec ATTRIBUTE_UNUSED,fragS * fragP ATTRIBUTE_UNUSED)263 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
264 segT sec ATTRIBUTE_UNUSED,
265 fragS *fragP ATTRIBUTE_UNUSED)
266 {
267 }
268
269 /* Functions concerning relocs. */
270
271 /* The location from which a PC relative jump should be calculated,
272 given a PC relative reloc. */
273
274 long
md_pcrel_from_section(fixS * fixP,segT sec)275 md_pcrel_from_section (fixS * fixP, segT sec)
276 {
277 if (fixP->fx_addsy != (symbolS *) NULL
278 && (! S_IS_DEFINED (fixP->fx_addsy)
279 || S_GET_SEGMENT (fixP->fx_addsy) != sec))
280 /* The symbol is undefined (or is defined but not in this section).
281 Let the linker figure it out. */
282 return 0;
283
284 return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
285 }
286
287 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
288 Returns BFD_RELOC_NONE if no reloc type can be found.
289 *FIXP may be modified if desired. */
290
291 bfd_reloc_code_real_type
md_cgen_lookup_reloc(const CGEN_INSN * insn ATTRIBUTE_UNUSED,const CGEN_OPERAND * operand,fixS * fixP)292 md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
293 const CGEN_OPERAND *operand,
294 fixS *fixP)
295 {
296 switch (operand->type)
297 {
298 case FR30_OPERAND_LABEL9: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
299 case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
300 case FR30_OPERAND_DISP10: return BFD_RELOC_FR30_10_IN_8;
301 case FR30_OPERAND_DISP9: return BFD_RELOC_FR30_9_IN_8;
302 case FR30_OPERAND_DISP8: return BFD_RELOC_FR30_8_IN_8;
303 case FR30_OPERAND_UDISP6: return BFD_RELOC_FR30_6_IN_4;
304 case FR30_OPERAND_I8: return BFD_RELOC_8;
305 case FR30_OPERAND_I32: return BFD_RELOC_FR30_48;
306 case FR30_OPERAND_I20: return BFD_RELOC_FR30_20;
307 default : /* Avoid -Wall warning. */
308 break;
309 }
310
311 return BFD_RELOC_NONE;
312 }
313
314 /* Write a value out to the object file, using the appropriate endianness. */
315
316 void
md_number_to_chars(char * buf,valueT val,int n)317 md_number_to_chars (char * buf, valueT val, int n)
318 {
319 number_to_chars_bigendian (buf, val, n);
320 }
321
322 /* Turn a string in input_line_pointer into a floating point constant of type
323 type, and store the appropriate bytes in *litP. The number of LITTLENUMS
324 emitted is stored in *sizeP . An error message is returned, or NULL on OK.
325 */
326
327 /* Equal to MAX_PRECISION in atof-ieee.c. */
328 #define MAX_LITTLENUMS 6
329
330 char *
md_atof(int type,char * litP,int * sizeP)331 md_atof (int type, char * litP, int * sizeP)
332 {
333 int i;
334 int prec;
335 LITTLENUM_TYPE words [MAX_LITTLENUMS];
336 char * t;
337
338 switch (type)
339 {
340 case 'f':
341 case 'F':
342 case 's':
343 case 'S':
344 prec = 2;
345 break;
346
347 case 'd':
348 case 'D':
349 case 'r':
350 case 'R':
351 prec = 4;
352 break;
353
354 /* FIXME: Some targets allow other format chars for bigger sizes here. */
355
356 default:
357 * sizeP = 0;
358 return _("Bad call to md_atof()");
359 }
360
361 t = atof_ieee (input_line_pointer, type, words);
362 if (t)
363 input_line_pointer = t;
364 * sizeP = prec * sizeof (LITTLENUM_TYPE);
365
366 for (i = 0; i < prec; i++)
367 {
368 md_number_to_chars (litP, (valueT) words[i],
369 sizeof (LITTLENUM_TYPE));
370 litP += sizeof (LITTLENUM_TYPE);
371 }
372
373 return 0;
374 }
375
376 /* Worker function for fr30_is_colon_insn(). */
377 static char
restore_colon(int advance_i_l_p_by)378 restore_colon (int advance_i_l_p_by)
379 {
380 char c;
381
382 /* Restore the colon, and advance input_line_pointer to
383 the end of the new symbol. */
384 * input_line_pointer = ':';
385 input_line_pointer += advance_i_l_p_by;
386 c = * input_line_pointer;
387 * input_line_pointer = 0;
388
389 return c;
390 }
391
392 /* Determines if the symbol starting at START and ending in
393 a colon that was at the location pointed to by INPUT_LINE_POINTER
394 (but which has now been replaced bu a NUL) is in fact an
395 LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
396 If it is, then it restores the colon, advances INPUT_LINE_POINTER
397 to the real end of the instruction/symbol, and returns the character
398 that really terminated the symbol. Otherwise it returns 0. */
399 char
fr30_is_colon_insn(char * start)400 fr30_is_colon_insn (char * start)
401 {
402 char * i_l_p = input_line_pointer;
403
404 /* Check to see if the symbol parsed so far is 'ldi'. */
405 if ( (start[0] != 'l' && start[0] != 'L')
406 || (start[1] != 'd' && start[1] != 'D')
407 || (start[2] != 'i' && start[2] != 'I')
408 || start[3] != 0)
409 {
410 /* Nope - check to see a 'd' follows the colon. */
411 if ( (i_l_p[1] == 'd' || i_l_p[1] == 'D')
412 && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
413 {
414 /* Yup - it might be delay slot instruction. */
415 int i;
416 static char * delay_insns [] =
417 {
418 "call", "jmp", "ret", "bra", "bno",
419 "beq", "bne", "bc", "bnc", "bn",
420 "bp", "bv", "bnv", "blt", "bge",
421 "ble", "bgt", "bls", "bhi"
422 };
423
424 for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
425 {
426 char * insn = delay_insns[i];
427 int len = strlen (insn);
428
429 if (start [len] != 0)
430 continue;
431
432 while (len --)
433 if (TOLOWER (start [len]) != insn [len])
434 break;
435
436 if (len == -1)
437 return restore_colon (1);
438 }
439 }
440
441 /* Nope - it is a normal label. */
442 return 0;
443 }
444
445 /* Check to see if the text following the colon is '8'. */
446 if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
447 return restore_colon (2);
448
449 /* Check to see if the text following the colon is '20'. */
450 else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
451 return restore_colon (3);
452
453 /* Check to see if the text following the colon is '32'. */
454 else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
455 return restore_colon (3);
456
457 return 0;
458 }
459
460 bfd_boolean
fr30_fix_adjustable(fixS * fixP)461 fr30_fix_adjustable (fixS * fixP)
462 {
463 /* We need the symbol name for the VTABLE entries. */
464 if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
465 || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
466 return 0;
467
468 return 1;
469 }
470