1 /* tc-fr30.c -- Assembler for the Fujitsu FR30.
2 Copyright (C) 1998-2023 Free Software Foundation, Inc.
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 3, 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, 51 Franklin Street - Fifth Floor,
19 Boston, MA 02110-1301, USA. */
20
21 #include "as.h"
22 #include "safe-ctype.h"
23 #include "subsegs.h"
24 #include "symcat.h"
25 #include "opcodes/fr30-desc.h"
26 #include "opcodes/fr30-opc.h"
27 #include "cgen.h"
28
29 /* Structure to hold all of the different components describing
30 an individual instruction. */
31 typedef struct
32 {
33 const CGEN_INSN * insn;
34 const CGEN_INSN * orig_insn;
35 CGEN_FIELDS fields;
36 #if CGEN_INT_INSN_P
37 CGEN_INSN_INT buffer [1];
38 #define INSN_VALUE(buf) (*(buf))
39 #else
40 unsigned char buffer [CGEN_MAX_INSN_SIZE];
41 #define INSN_VALUE(buf) (buf)
42 #endif
43 char * addr;
44 fragS * frag;
45 int num_fixups;
46 fixS * fixups [GAS_CGEN_MAX_FIXUPS];
47 int indices [MAX_OPERAND_INSTANCES];
48 }
49 fr30_insn;
50
51 const char comment_chars[] = ";";
52 const char line_comment_chars[] = "#";
53 const char line_separator_chars[] = "|";
54 const char EXP_CHARS[] = "eE";
55 const char FLT_CHARS[] = "dD";
56
57 #define FR30_SHORTOPTS ""
58 const char * md_shortopts = FR30_SHORTOPTS;
59
60 struct option md_longopts[] =
61 {
62 {NULL, no_argument, NULL, 0}
63 };
64 size_t md_longopts_size = sizeof (md_longopts);
65
66 int
67 md_parse_option (int c ATTRIBUTE_UNUSED,
68 const char *arg ATTRIBUTE_UNUSED)
69 {
70 switch (c)
71 {
72 default:
73 return 0;
74 }
75 return 1;
76 }
77
78 void
79 md_show_usage (FILE * stream)
80 {
81 fprintf (stream, _(" FR30 specific command line options:\n"));
82 }
83
84 /* The target specific pseudo-ops which we support. */
85 const pseudo_typeS md_pseudo_table[] =
86 {
87 { "word", cons, 4 },
88 { NULL, NULL, 0 }
89 };
90
91
92 void
93 md_begin (void)
94 {
95 /* Initialize the `cgen' interface. */
96
97 /* Set the machine number and endian. */
98 gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
99 CGEN_CPU_OPEN_ENDIAN,
100 CGEN_ENDIAN_BIG,
101 CGEN_CPU_OPEN_END);
102 fr30_cgen_init_asm (gas_cgen_cpu_desc);
103
104 /* This is a callback from cgen to gas to parse operands. */
105 cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
106 }
107
108 void
109 md_assemble (char *str)
110 {
111 static int last_insn_had_delay_slot = 0;
112 fr30_insn insn;
113 char *errmsg;
114
115 /* Initialize GAS's cgen interface for a new instruction. */
116 gas_cgen_init_parse ();
117
118 insn.insn = fr30_cgen_assemble_insn
119 (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
120
121 if (!insn.insn)
122 {
123 as_bad ("%s", errmsg);
124 return;
125 }
126
127 /* Doesn't really matter what we pass for RELAX_P here. */
128 gas_cgen_finish_insn (insn.insn, insn.buffer,
129 CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
130
131 /* Warn about invalid insns in delay slots. */
132 if (last_insn_had_delay_slot
133 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT))
134 as_warn (_("Instruction %s not allowed in a delay slot."),
135 CGEN_INSN_NAME (insn.insn));
136
137 last_insn_had_delay_slot
138 = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
139 }
140
141 /* The syntax in the manual says constants begin with '#'.
142 We just ignore it. */
143
144 void
145 md_operand (expressionS * expressionP)
146 {
147 if (* input_line_pointer == '#')
148 {
149 input_line_pointer ++;
150 expression (expressionP);
151 }
152 }
153
154 valueT
155 md_section_align (segT segment, valueT size)
156 {
157 int align = bfd_section_alignment (segment);
158
159 return ((size + (1 << align) - 1) & -(1 << align));
160 }
161
162 symbolS *
163 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
164 {
165 return NULL;
166 }
167
168 /* Interface to relax_segment. */
169
170 /* FIXME: Build table by hand, get it working, then machine generate. */
171
172 const relax_typeS md_relax_table[] =
173 {
174 /* The fields are:
175 1) most positive reach of this state,
176 2) most negative reach of this state,
177 3) how many bytes this mode will add to the size of the current frag
178 4) which index into the table to try if we can't fit into this one. */
179
180 /* The first entry must be unused because an `rlx_more' value of zero ends
181 each list. */
182 {1, 1, 0, 0},
183
184 /* The displacement used by GAS is from the end of the 2 byte insn,
185 so we subtract 2 from the following. */
186 /* 16 bit insn, 8 bit disp -> 10 bit range.
187 This doesn't handle a branch in the right slot at the border:
188 the "& -4" isn't taken into account. It's not important enough to
189 complicate things over it, so we subtract an extra 2 (or + 2 in -ve
190 case). */
191 {511 - 2 - 2, -512 - 2 + 2, 0, 2 },
192 /* 32 bit insn, 24 bit disp -> 26 bit range. */
193 {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
194 /* Same thing, but with leading nop for alignment. */
195 {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
196 };
197
198 /* Return an initial guess of the length by which a fragment must grow to
199 hold a branch to reach its destination.
200 Also updates fr_type/fr_subtype as necessary.
201
202 Called just before doing relaxation.
203 Any symbol that is now undefined will not become defined.
204 The guess for fr_var is ACTUALLY the growth beyond fr_fix.
205 Whatever we do to grow fr_fix or fr_var contributes to our returned value.
206 Although it may not be explicit in the frag, pretend fr_var starts with a
207 0 value. */
208
209 int
210 md_estimate_size_before_relax (fragS * fragP, segT segment)
211 {
212 /* The only thing we have to handle here are symbols outside of the
213 current segment. They may be undefined or in a different segment in
214 which case linker scripts may place them anywhere.
215 However, we can't finish the fragment here and emit the reloc as insn
216 alignment requirements may move the insn about. */
217
218 if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
219 {
220 /* The symbol is undefined in this segment.
221 Change the relaxation subtype to the max allowable and leave
222 all further handling to md_convert_frag. */
223 fragP->fr_subtype = 2;
224
225 {
226 const CGEN_INSN * insn;
227 int i;
228
229 /* Update the recorded insn.
230 Fortunately we don't have to look very far.
231 FIXME: Change this to record in the instruction the next higher
232 relaxable insn to use. */
233 for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
234 {
235 if ((strcmp (CGEN_INSN_MNEMONIC (insn),
236 CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
237 == 0)
238 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED))
239 break;
240 }
241 if (i == 4)
242 abort ();
243
244 fragP->fr_cgen.insn = insn;
245 return 2;
246 }
247 }
248
249 /* Return the size of the variable part of the frag. */
250 return md_relax_table[fragP->fr_subtype].rlx_length;
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
261 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
262 segT sec ATTRIBUTE_UNUSED,
263 fragS *fragP ATTRIBUTE_UNUSED)
264 {
265 }
266
267 /* Functions concerning relocs. */
268
269 /* The location from which a PC relative jump should be calculated,
270 given a PC relative reloc. */
271
272 long
273 md_pcrel_from_section (fixS * fixP, segT sec)
274 {
275 if (fixP->fx_addsy != (symbolS *) NULL
276 && (! S_IS_DEFINED (fixP->fx_addsy)
277 || S_GET_SEGMENT (fixP->fx_addsy) != sec))
278 /* The symbol is undefined (or is defined but not in this section).
279 Let the linker figure it out. */
280 return 0;
281
282 return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
283 }
284
285 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
286 Returns BFD_RELOC_NONE if no reloc type can be found.
287 *FIXP may be modified if desired. */
288
289 bfd_reloc_code_real_type
290 md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
291 const CGEN_OPERAND *operand,
292 fixS *fixP)
293 {
294 switch (operand->type)
295 {
296 case FR30_OPERAND_LABEL9: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
297 case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
298 case FR30_OPERAND_DISP10: return BFD_RELOC_FR30_10_IN_8;
299 case FR30_OPERAND_DISP9: return BFD_RELOC_FR30_9_IN_8;
300 case FR30_OPERAND_DISP8: return BFD_RELOC_FR30_8_IN_8;
301 case FR30_OPERAND_UDISP6: return BFD_RELOC_FR30_6_IN_4;
302 case FR30_OPERAND_I8: return BFD_RELOC_8;
303 case FR30_OPERAND_I32: return BFD_RELOC_FR30_48;
304 case FR30_OPERAND_I20: return BFD_RELOC_FR30_20;
305 default : /* Avoid -Wall warning. */
306 break;
307 }
308
309 return BFD_RELOC_NONE;
310 }
311
312 /* Write a value out to the object file, using the appropriate endianness. */
313
314 void
315 md_number_to_chars (char * buf, valueT val, int n)
316 {
317 number_to_chars_bigendian (buf, val, n);
318 }
319
320 const char *
321 md_atof (int type, char * litP, int * sizeP)
322 {
323 return ieee_md_atof (type, litP, sizeP, true);
324 }
325
326 /* Worker function for fr30_is_colon_insn(). */
327 static int
328 restore_colon (char *next_i_l_p, char *nul_char)
329 {
330 /* Restore the colon, and advance input_line_pointer to
331 the end of the new symbol. */
332 *input_line_pointer = *nul_char;
333 input_line_pointer = next_i_l_p;
334 *nul_char = *next_i_l_p;
335 *next_i_l_p = 0;
336 return 1;
337 }
338
339 /* Determines if the symbol starting at START and ending in
340 a colon that was at the location pointed to by INPUT_LINE_POINTER
341 (but which has now been replaced bu a NUL) is in fact an
342 LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
343 If it is, then it restores the colon, advances INPUT_LINE_POINTER
344 to the real end of the instruction/symbol, saves the char there to
345 NUL_CHAR and pokes a NUL, and returns 1. Otherwise it returns 0. */
346 int
347 fr30_is_colon_insn (char *start, char *nul_char)
348 {
349 char * i_l_p = input_line_pointer;
350
351 if (*nul_char == '"')
352 ++i_l_p;
353
354 /* Check to see if the symbol parsed so far is 'ldi'. */
355 if ( (start[0] != 'l' && start[0] != 'L')
356 || (start[1] != 'd' && start[1] != 'D')
357 || (start[2] != 'i' && start[2] != 'I')
358 || start[3] != 0)
359 {
360 /* Nope - check to see a 'd' follows the colon. */
361 if ( (i_l_p[1] == 'd' || i_l_p[1] == 'D')
362 && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
363 {
364 /* Yup - it might be delay slot instruction. */
365 int i;
366 static const char * delay_insns [] =
367 {
368 "call", "jmp", "ret", "bra", "bno",
369 "beq", "bne", "bc", "bnc", "bn",
370 "bp", "bv", "bnv", "blt", "bge",
371 "ble", "bgt", "bls", "bhi"
372 };
373
374 for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
375 {
376 const char * insn = delay_insns[i];
377 int len = strlen (insn);
378
379 if (start [len] != 0)
380 continue;
381
382 while (len --)
383 if (TOLOWER (start [len]) != insn [len])
384 break;
385
386 if (len == -1)
387 return restore_colon (i_l_p + 1, nul_char);
388 }
389 }
390
391 /* Nope - it is a normal label. */
392 return 0;
393 }
394
395 /* Check to see if the text following the colon is '8'. */
396 if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
397 return restore_colon (i_l_p + 2, nul_char);
398
399 /* Check to see if the text following the colon is '20'. */
400 else if (i_l_p[1] == '2' && i_l_p[2] =='0'
401 && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
402 return restore_colon (i_l_p + 3, nul_char);
403
404 /* Check to see if the text following the colon is '32'. */
405 else if (i_l_p[1] == '3' && i_l_p[2] =='2'
406 && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
407 return restore_colon (i_l_p + 3, nul_char);
408
409 return 0;
410 }
411
412 bool
413 fr30_fix_adjustable (fixS * fixP)
414 {
415 /* We need the symbol name for the VTABLE entries. */
416 if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
417 || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
418 return 0;
419
420 return 1;
421 }