1 /* Definitions of target machine for GNU compiler, Lattice Mico32 architecture.
2 Contributed by Jon Beniston <jon@beniston.com>
3
4 Copyright (C) 2009-2023 Free Software Foundation, Inc.
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published
10 by the Free Software Foundation; either version 3, or (at your
11 option) any later version.
12
13 GCC is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
21
22 /*-------------------------------*/
23 /* Run-time Target Specification */
24 /*-------------------------------*/
25
26 /* Target CPU builtins. */
27 #define TARGET_CPU_CPP_BUILTINS() \
28 do \
29 { \
30 builtin_define ("__lm32__"); \
31 builtin_assert ("cpu=lm32"); \
32 builtin_assert ("machine=lm32"); \
33 if (TARGET_MULTIPLY_ENABLED) \
34 builtin_define ("__multiply_enabled__"); \
35 if (TARGET_DIVIDE_ENABLED) \
36 builtin_define ("__divide_enabled__"); \
37 if (TARGET_BARREL_SHIFT_ENABLED) \
38 builtin_define ("__barrel_shift_enabled__"); \
39 if (TARGET_SIGN_EXTEND_ENABLED) \
40 builtin_define ("__sign_extend_enabled__"); \
41 if (TARGET_USER_ENABLED) \
42 builtin_define ("__user_enabled__"); \
43 } \
44 while (0)
45
46 #undef ASM_SPEC
47 #define ASM_SPEC "\
48 %{mmultiply-enabled} \
49 %{mdivide-enabled} \
50 %{mbarrel-shift-enabled} \
51 %{msign-extend-enabled} \
52 %{muser-enabled} \
53 "
54
55 /* Let link script define all link options.
56 Default to using simulator link script. */
57
58 #undef STARTFILE_SPEC
59 #define STARTFILE_SPEC ""
60 #undef ENDFILE_SPEC
61 #define ENDFILE_SPEC ""
62 #undef LIB_SPEC
63 #define LIB_SPEC "%{!T*:-T sim.ld}"
64
65 #undef CC1_SPEC
66 #define CC1_SPEC "%{G*}"
67
68 /*---------------------------------*/
69 /* Target machine storage layout. */
70 /*---------------------------------*/
71
72 #define BITS_BIG_ENDIAN 0
73 #define BYTES_BIG_ENDIAN 1
74 #define WORDS_BIG_ENDIAN 1
75
76 #define BITS_PER_WORD 32
77 #define UNITS_PER_WORD 4
78
79 #define POINTER_SIZE 32
80
81 #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE) \
82 do { \
83 if (GET_MODE_CLASS (MODE) == MODE_INT \
84 && GET_MODE_SIZE (MODE) < UNITS_PER_WORD) \
85 (MODE) = word_mode; \
86 } while (0)
87
88 #define PARM_BOUNDARY 32
89
90 #define STACK_BOUNDARY 32
91
92 #define BIGGEST_ALIGNMENT 64
93
94 #define FUNCTION_BOUNDARY 32
95
96 #define EMPTY_FIELD_BOUNDARY 32
97
98 #define STRICT_ALIGNMENT 1
99
100 #define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
101
102 /* Make arrays and structures word-aligned to allow faster copying etc. */
103 #define DATA_ALIGNMENT(TYPE, ALIGN) \
104 ((((ALIGN) < BITS_PER_WORD) \
105 && (TREE_CODE (TYPE) == ARRAY_TYPE \
106 || TREE_CODE (TYPE) == UNION_TYPE \
107 || TREE_CODE (TYPE) == RECORD_TYPE)) ? BITS_PER_WORD : (ALIGN))
108
109 /* We need this for the same reason as DATA_ALIGNMENT, namely to cause
110 character arrays to be word-aligned so that `strcpy' calls that copy
111 constants to character arrays can be done inline, and 'strcmp' can be
112 optimised to use word loads. */
113 #define LOCAL_ALIGNMENT(TYPE, ALIGN) \
114 DATA_ALIGNMENT (TYPE, ALIGN)
115
116 /*----------------------------------------*/
117 /* Layout of source language data types. */
118 /*----------------------------------------*/
119
120 #define INT_TYPE_SIZE 32
121 #define SHORT_TYPE_SIZE 16
122 #define LONG_TYPE_SIZE 32
123 #define LONG_LONG_TYPE_SIZE 64
124
125 #define FLOAT_TYPE_SIZE 32
126 #define DOUBLE_TYPE_SIZE 64
127 #define LONG_DOUBLE_TYPE_SIZE 64
128
129 #define DEFAULT_SIGNED_CHAR 0
130
131 #define SIZE_TYPE "unsigned int"
132
133 #define PTRDIFF_TYPE "int"
134
135 /*---------------------------*/
136 /* Standard register usage. */
137 /*---------------------------*/
138
139 #define FIRST_PSEUDO_REGISTER 32
140
141 #define RV_REGNUM 1
142 #define GP_REGNUM 26
143 #define FP_REGNUM 27
144 #define SP_REGNUM 28
145 #define RA_REGNUM 29
146
147 #define G_REG_P(X) ((X)<32)
148
149 #define FIXED_REGISTERS \
150 { 1, 0, 0, 0, 0, 0, 0, 0, \
151 0, 0, 0, 0, 0, 0, 0, 0, \
152 0, 0, 0, 0, 0, 0, 0, 0, \
153 0, 0, 1, 0, 1, 0, 1, 1}
154
155 #define CALL_USED_REGISTERS \
156 { 1, 1, 1, 1, 1, 1, 1, 1, \
157 1, 1, 1, 0, 0, 0, 0, 0, \
158 0, 0, 0, 0, 0, 0, 0, 0, \
159 0, 0, 1, 0, 1, 0, 1, 1}
160
161 #define AVOID_CCMODE_COPIES
162
163 /*----------------------------------*/
164 /* Register classes and constants. */
165 /*----------------------------------*/
166
167 enum reg_class
168 {
169 NO_REGS,
170 GENERAL_REGS,
171 ALL_REGS,
172 LIM_REG_CLASSES
173 };
174
175 #define N_REG_CLASSES (int) LIM_REG_CLASSES
176
177 #define REG_CLASS_NAMES { "NO_REGS", "GENERAL_REGS", "ALL_REGS" }
178
179 #define REG_CLASS_CONTENTS \
180 { {0x00000000}, \
181 {0xffffffff}, \
182 {0xffffffff} \
183 }
184
185 #define REGNO_REG_CLASS(REGNO) \
186 (G_REG_P(REGNO) ? GENERAL_REGS : NO_REGS)
187
188 #define INDEX_REG_CLASS NO_REGS
189
190 #define BASE_REG_CLASS GENERAL_REGS
191
192 #define REGNO_OK_FOR_BASE_P(REGNO) \
193 (G_REG_P (REGNO) || G_REG_P ((unsigned) reg_renumber[REGNO]))
194
195 #define REGNO_OK_FOR_INDEX_P(REGNO) 0
196
197 /*----------------------------------------*/
198 /* Stack Layout and Calling Conventions. */
199 /*----------------------------------------*/
200
201 #define STACK_GROWS_DOWNWARD 1
202
203 #define FRAME_GROWS_DOWNWARD 1
204
205 #define STACK_POINTER_OFFSET (UNITS_PER_WORD)
206
207 #define FIRST_PARM_OFFSET(FNDECL) (UNITS_PER_WORD)
208
209 #define STACK_POINTER_REGNUM SP_REGNUM
210
211 #define FRAME_POINTER_REGNUM FP_REGNUM
212
213 #define ARG_POINTER_REGNUM FRAME_POINTER_REGNUM
214
215 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (SImode, RA_REGNUM)
216
217 #define RETURN_ADDR_RTX(count, frame) \
218 lm32_return_addr_rtx (count, frame)
219
220 /* FIXME - This is not yet supported. */
221 #define STATIC_CHAIN_REGNUM 9
222
223 #define ELIMINABLE_REGS \
224 {{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM }, \
225 { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM }, \
226 }
227
228 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
229 (OFFSET) = lm32_compute_initial_elimination_offset (FROM, TO)
230
231 /*-----------------------------*/
232 /* Function argument passing. */
233 /*-----------------------------*/
234
235 #define ACCUMULATE_OUTGOING_ARGS 1
236
237 /*--------------------------------*/
238 /* Passing Arguments in Registers */
239 /*--------------------------------*/
240
241 /* The first argument register. */
242 #define LM32_FIRST_ARG_REG 1
243
244 /* The number of (integer) argument register available. */
245 #define LM32_NUM_ARG_REGS 8
246
247 #define CUMULATIVE_ARGS int
248
249 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT,N_NAMED_ARGS) \
250 (CUM) = 0
251
252 #define FUNCTION_ARG_REGNO_P(r) \
253 (((r) >= LM32_FIRST_ARG_REG) && ((r) <= LM32_NUM_ARG_REGS))
254
255 /*--------------------*/
256 /* Function results. */
257 /*--------------------*/
258
259 #define FUNCTION_VALUE(VALTYPE, FUNC) \
260 gen_rtx_REG ((INTEGRAL_TYPE_P (VALTYPE) \
261 && TYPE_PRECISION (VALTYPE) < BITS_PER_WORD) \
262 ? word_mode \
263 : TYPE_MODE (VALTYPE), \
264 RV_REGNUM)
265
266 #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, RV_REGNUM)
267
268 #define FUNCTION_VALUE_REGNO_P(N) ((N) == RV_REGNUM)
269
270 #define RETURN_IN_MEMORY(TYPE) lm32_return_in_memory (TYPE)
271
272 #define DEFAULT_PCC_STRUCT_RETURN 0
273
274 /* Convert from bytes to ints. */
275 #define LM32_NUM_INTS(X) (((X) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
276
277 /* The number of (integer) registers required to hold a quantity of
278 type MODE. */
279 #define LM32_NUM_REGS(MODE) LM32_NUM_INTS (GET_MODE_SIZE (MODE))
280
281 /* The number of (integer) registers required to hold a quantity of
282 TYPE MODE. */
283 #define LM32_NUM_REGS2(MODE, TYPE) \
284 LM32_NUM_INTS ((MODE) == BLKmode ? \
285 int_size_in_bytes (TYPE) : GET_MODE_SIZE (MODE))
286
287 /*---------------------------*/
288 /* Function entry and exit. */
289 /*---------------------------*/
290
291 /*-------------*/
292 /* Profiling. */
293 /*-------------*/
294
295 #define FUNCTION_PROFILER(FILE, LABELNO)
296
297 /*---------------*/
298 /* Trampolines. */
299 /*---------------*/
300
301 #define TRAMPOLINE_SIZE 0
302
303 /*---------------------*/
304 /* Addressing Modes. */
305 /*---------------------*/
306
307 #define CONSTANT_ADDRESS_P(X) \
308 ((GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
309 || GET_CODE (X) == CONST_INT || GET_CODE (X) == HIGH \
310 || (GET_CODE (X) == CONST)))
311
312 #define MAX_REGS_PER_ADDRESS 1
313
314 #define STRICT_REG_OK_FOR_BASE_P(X) \
315 (REGNO_OK_FOR_BASE_P (REGNO (X)))
316 #define NONSTRICT_REG_OK_FOR_BASE_P(X) \
317 (G_REG_P (REGNO (X)) || !HARD_REGISTER_NUM_P (REGNO (X)))
318
319 #ifdef REG_OK_STRICT
320 #define REG_OK_FOR_BASE_P(X) STRICT_REG_OK_FOR_BASE_P(X)
321 #else
322 #define REG_OK_FOR_BASE_P(X) NONSTRICT_REG_OK_FOR_BASE_P(X)
323 #endif
324
325 /*-------------------------*/
326 /* Condition Code Status. */
327 /*-------------------------*/
328
329 #define REVERSIBLE_CC_MODE(MODE) 1
330
331 /*---------*/
332 /* Costs. */
333 /*---------*/
334
335 #define SLOW_BYTE_ACCESS 1
336
337 #define NO_FUNCTION_CSE 1
338
339 #define BRANCH_COST(speed_p, predictable_p) 4
340
341 #define MOVE_RATIO(speed) (speed ? 24 : 3)
342
343 /*------------*/
344 /* Sections. */
345 /*------------*/
346
347 #define TEXT_SECTION_ASM_OP "\t.section\t.text"
348 #define DATA_SECTION_ASM_OP "\t.section\t.data"
349 #define SDATA_SECTION_ASM_OP "\t.section\t.sdata,\"aw\""
350 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
351 #define SBSS_SECTION_ASM_OP "\t.section\t.sbss,\"aw\""
352
353 /*-------*/
354 /* PIC. */
355 /*-------*/
356
357 #define PIC_OFFSET_TABLE_REGNUM (flag_pic ? GP_REGNUM : INVALID_REGNUM)
358
359 #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
360
361 #define LEGITIMATE_PIC_OPERAND_P(X) \
362 (!(nonpic_symbol_mentioned_p (X)))
363
364 /*-------------*/
365 /* Assembler. */
366 /*-------------*/
367
368 #define ASM_COMMENT_START "#"
369
370 #define ASM_APP_ON "#APP\n"
371
372 #define ASM_APP_OFF "#NO_APP\n"
373
374 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
375 do { \
376 fputc ( '\t', FILE); \
377 assemble_name (FILE, LABEL1); \
378 fputs ( " = ", FILE); \
379 assemble_name (FILE, LABEL2); \
380 fputc ( '\n', FILE); \
381 } while (0)
382
383 /* Override default implementation in elfos.h to support -G. */
384 #undef ASM_OUTPUT_ALIGNED_LOCAL
385 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
386 do { \
387 if ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value) \
388 switch_to_section (sbss_section); \
389 else \
390 switch_to_section (bss_section); \
391 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
392 if (!flag_inhibit_size_directive) \
393 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \
394 ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \
395 ASM_OUTPUT_LABEL(FILE, NAME); \
396 ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \
397 } while (0)
398
399 /* Override default implementation in elfos.h to support -G. */
400 #undef ASM_OUTPUT_ALIGNED_COMMON
401 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
402 do \
403 { \
404 if ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value) \
405 { \
406 switch_to_section (sbss_section); \
407 (*targetm.asm_out.globalize_label) (FILE, NAME); \
408 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
409 if (!flag_inhibit_size_directive) \
410 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \
411 ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \
412 ASM_OUTPUT_LABEL(FILE, NAME); \
413 ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \
414 } \
415 else \
416 { \
417 switch_to_section (bss_section); \
418 fprintf ((FILE), "%s", COMMON_ASM_OP); \
419 assemble_name ((FILE), (NAME)); \
420 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
421 (SIZE), (ALIGN) / BITS_PER_UNIT); \
422 } \
423 } \
424 while (0)
425
426 #define ASM_OUTPUT_LABEL(FILE, NAME) \
427 do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0)
428
429 #define ASM_OUTPUT_LABELREF(FILE,NAME) \
430 do { \
431 const char *xname = (NAME); \
432 if (xname[0] == '@') \
433 xname += 1; \
434 if (xname[0] == '*') \
435 xname += 1; \
436 fputs (xname, FILE); \
437 } while (0)
438
439 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYMBOL) \
440 do { \
441 assemble_name (STREAM, XSTR (SYMBOL, 0)); \
442 } while (0)
443
444 #define GLOBAL_ASM_OP "\t.global\t"
445
446 #define REGISTER_NAMES \
447 { \
448 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
449 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
450 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
451 "r24", "r25", "gp", "fp", "sp", "ra", "ea", "ba"}
452
453 #define PRINT_OPERAND_PUNCT_VALID_P(CHAR) \
454 (((CHAR) == '&') || ((CHAR) == '@') || ((CHAR) == '*'))
455
456 #define PRINT_OPERAND(FILE, X, CODE) \
457 lm32_print_operand (FILE, X, CODE)
458
459 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) \
460 lm32_print_operand_address (FILE, ADDR)
461
462 #ifndef LOCAL_LABEL_PREFIX
463 #define LOCAL_LABEL_PREFIX "."
464 #endif
465
466 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
467 do { if ((LOG) != 0) fprintf (FILE, "\t.align %d\n", (1 << (LOG))); } while (0)
468
469 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
470 do { \
471 char label[64]; \
472 ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE); \
473 fprintf (FILE, "\n\t.word\t"); \
474 assemble_name (FILE, label); \
475 fprintf (FILE, "\n"); \
476 } while (0)
477
478 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
479 do { \
480 char label[64]; \
481 fprintf (FILE, "\t.word\t("); \
482 ASM_GENERATE_INTERNAL_LABEL (label, "L", VALUE); \
483 assemble_name (FILE, label); \
484 fprintf (FILE, "-"); \
485 ASM_GENERATE_INTERNAL_LABEL (label, "L", REL); \
486 assemble_name (FILE, label); \
487 fprintf (FILE, ")\n"); \
488 } while (0)
489
490 /*-------------*/
491 /* Debugging. */
492 /*-------------*/
493
494 #define DEBUGGER_REGNO(REGNO) (REGNO)
495
496 #define DEFAULT_GDB_EXTENSIONS 1
497
498 /*--------*/
499 /* Misc. */
500 /*--------*/
501
502 #define CASE_VECTOR_MODE Pmode
503
504 #define WORD_REGISTER_OPERATIONS 1
505
506 #define LOAD_EXTEND_OP(MODE) ZERO_EXTEND
507
508 #define SHORT_IMMEDIATES_SIGN_EXTEND 1
509
510 #define MOVE_MAX UNITS_PER_WORD
511 #define MAX_MOVE_MAX 4
512
513 #define SHIFT_COUNT_TRUNCATED 1
514
515 #define Pmode SImode
516
517 #define FUNCTION_MODE SImode
518
519 #define STORE_FLAG_VALUE 1