1 /* Definitions of target machine for GNU compiler for Xilinx MicroBlaze.
2 Copyright (C) 2009-2023 Free Software Foundation, Inc.
3
4 Contributed by Michael Eager <eager@eagercon.com>.
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 /* Standard GCC variables that we reference. */
23
24 /* MicroBlaze external variables defined in microblaze.cc. */
25
26 /* Which pipeline to schedule for. */
27 enum pipeline_type
28 {
29 MICROBLAZE_PIPE_3 = 0,
30 MICROBLAZE_PIPE_5 = 1
31 };
32
33 #define MICROBLAZE_MASK_NO_UNSAFE_DELAY 0x00000001
34
35 /* print_operand punctuation chars */
36 extern char microblaze_print_operand_punct[];
37
38 /* # bytes of data/sdata cutoff */
39 extern int microblaze_section_threshold;
40
41 /* Map register # to debug register # */
42 extern int microblaze_debugger_regno[];
43
44 extern int microblaze_no_unsafe_delay;
45 extern int microblaze_has_clz;
46 extern enum pipeline_type microblaze_pipe;
47
48 #define OBJECT_FORMAT_ELF
49
50 #if TARGET_BIG_ENDIAN_DEFAULT
51 #define TARGET_ENDIAN_DEFAULT 0
52 #define TARGET_ENDIAN_OPTION "mbig-endian"
53 #else
54 #define TARGET_ENDIAN_DEFAULT MASK_LITTLE_ENDIAN
55 #define TARGET_ENDIAN_OPTION "mlittle-endian"
56 #endif
57
58 /* Default target_flags if no switches are specified */
59 #define TARGET_DEFAULT (MASK_SOFT_MUL | MASK_SOFT_DIV | MASK_SOFT_FLOAT \
60 | TARGET_ENDIAN_DEFAULT)
61
62 /* Do we have CLZ? */
63 #define TARGET_HAS_CLZ (TARGET_PATTERN_COMPARE && microblaze_has_clz)
64
65 /* The default is to support PIC. */
66 #define TARGET_SUPPORTS_PIC 1
67
68 /* The default is to not need GOT for TLS. */
69 #define TLS_NEEDS_GOT 0
70
71 /* What is the default setting for -mcpu= . We set it to v4.00.a even though
72 we are actually ahead. This is safest version that has generate code
73 compatible for the original ISA */
74 #define MICROBLAZE_DEFAULT_CPU "v4.00.a"
75
76 /* Macros to decide whether certain features are available or not,
77 depending on the instruction set architecture level. */
78
79 #define DRIVER_SELF_SPECS \
80 "%{mxl-soft-mul:%<mno-xl-soft-mul}", \
81 "%{mno-xl-barrel-shift:%<mxl-barrel-shift}", \
82 "%{mno-xl-pattern-compare:%<mxl-pattern-compare}", \
83 "%{mxl-soft-div:%<mno-xl-soft-div}", \
84 "%{mxl-reorder:%<mno-xl-reorder}", \
85 "%{msoft-float:%<mhard-float}"
86
87 /* Tell collect what flags to pass to nm. */
88 #ifndef NM_FLAGS
89 #define NM_FLAGS "-Bn"
90 #endif
91
92 /* Names to predefine in the preprocessor for this target machine. */
93 #define TARGET_CPU_CPP_BUILTINS() microblaze_cpp_define (pfile)
94
95 /* Assembler specs. */
96
97 #define TARGET_ASM_SPEC ""
98
99 #define ASM_SPEC "\
100 %(target_asm_spec) \
101 %{mbig-endian:-EB} \
102 %{mlittle-endian:-EL}"
103
104 /* Extra switches sometimes passed to the linker. */
105 /* -xl-mode-xmdstub translated to -Zxl-mode-xmdstub -- deprecated. */
106
107 #define LINK_SPEC "%{shared:-shared} -N -relax \
108 %{mbig-endian:-EB --oformat=elf32-microblaze} \
109 %{mlittle-endian:-EL --oformat=elf32-microblazeel} \
110 %{Zxl-mode-xmdstub:-defsym _TEXT_START_ADDR=0x800} \
111 %{mxl-mode-xmdstub:-defsym _TEXT_START_ADDR=0x800} \
112 %{mxl-gp-opt:%{G*}} %{!mxl-gp-opt: -G 0} \
113 %{!T*: -dT xilinx.ld%s}"
114
115 /* Specs for the compiler proper */
116
117 #ifndef CC1_SPEC
118 #define CC1_SPEC " \
119 %{G*} \
120 %(subtarget_cc1_spec) \
121 %{mxl-multiply-high:-mcpu=v6.00.a} \
122 "
123 #endif
124
125 #define EXTRA_SPECS \
126 { "target_asm_spec", TARGET_ASM_SPEC }, \
127 SUBTARGET_EXTRA_SPECS
128
129 /* Local compiler-generated symbols must have a prefix that the assembler
130 understands. */
131
132 #ifndef LOCAL_LABEL_PREFIX
133 #define LOCAL_LABEL_PREFIX "$"
134 #endif
135
136 /* fixed registers. */
137 #define MB_ABI_BASE_REGNUM 0
138 #define MB_ABI_STACK_POINTER_REGNUM 1
139 #define MB_ABI_GPRO_REGNUM 2
140 #define MB_ABI_GPRW_REGNUM 13
141 #define MB_ABI_INTR_RETURN_ADDR_REGNUM 14
142 #define MB_ABI_SUB_RETURN_ADDR_REGNUM 15
143 #define MB_ABI_DEBUG_RETURN_ADDR_REGNUM 16
144 #define MB_ABI_EXCEPTION_RETURN_ADDR_REGNUM 17
145 #define MB_ABI_ASM_TEMP_REGNUM 18
146 /* This is our temp register. */
147 #define MB_ABI_FRAME_POINTER_REGNUM 19
148 #define MB_ABI_PIC_ADDR_REGNUM 20
149 #define MB_ABI_PIC_FUNC_REGNUM 21
150 /* Volatile registers. */
151 #define MB_ABI_INT_RETURN_VAL_REGNUM 3
152 #define MB_ABI_INT_RETURN_VAL2_REGNUM 4
153 #define MB_ABI_FIRST_ARG_REGNUM 5
154 #define MB_ABI_LAST_ARG_REGNUM 10
155 #define MB_ABI_MAX_ARG_REGS (MB_ABI_LAST_ARG_REGNUM \
156 - MB_ABI_FIRST_ARG_REGNUM + 1)
157 #define MB_ABI_STATIC_CHAIN_REGNUM 3
158 #define MB_ABI_TEMP1_REGNUM 11
159 #define MB_ABI_TEMP2_REGNUM 12
160 #define MB_ABI_MSR_SAVE_REG 11
161 /* Volatile register used to save MSR in interrupt handlers. */
162
163
164 /* Debug stuff. */
165
166 /* How to renumber registers for gdb. */
167 #define DEBUGGER_REGNO(REGNO) microblaze_debugger_regno[(REGNO)]
168
169 /* Generate DWARF exception handling info. */
170 #define DWARF2_UNWIND_INFO 1
171
172 /* Don't generate .loc operations. */
173 #define DWARF2_ASM_LINE_DEBUG_INFO 0
174
175 /* The DWARF 2 CFA column which tracks the return address. */
176 #define DWARF_FRAME_RETURN_COLUMN \
177 (GP_REG_FIRST + MB_ABI_SUB_RETURN_ADDR_REGNUM)
178
179 /* Initial state of return address on entry to func = R15.
180 Actually, the RA is at R15+8, but gcc doesn't know how
181 to generate this.
182 NOTE: GDB has a workaround and expects this incorrect value.
183 If this is fixed, a corresponding fix to GDB is needed. */
184 #define INCOMING_RETURN_ADDR_RTX \
185 gen_rtx_REG (Pmode, GP_REG_FIRST + MB_ABI_SUB_RETURN_ADDR_REGNUM)
186
187 /* Specifies the offset from INCOMING_RETURN_ADDR_RTX and the actual return PC. */
188 #define RETURN_ADDR_OFFSET (8)
189
190 /* Describe how we implement __builtin_eh_return. */
191 #define EH_RETURN_DATA_REGNO(N) \
192 (((N) < 2) ? MB_ABI_FIRST_ARG_REGNUM + (N) : INVALID_REGNUM)
193
194 #define MB_EH_STACKADJ_REGNUM MB_ABI_INT_RETURN_VAL2_REGNUM
195 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, MB_EH_STACKADJ_REGNUM)
196
197 /* Select a format to encode pointers in exception handling data. CODE
198 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
199 true if the symbol may be affected by dynamic relocations. */
200 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
201 ((flag_pic || GLOBAL) ? DW_EH_PE_aligned : DW_EH_PE_absptr)
202
203 /* Use DWARF 2 debugging information by default. */
204 #define DWARF2_DEBUGGING_INFO
205 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
206
207 /* Target machine storage layout */
208
209 #define BITS_BIG_ENDIAN 0
210 #define BYTES_BIG_ENDIAN (TARGET_LITTLE_ENDIAN == 0)
211 #define WORDS_BIG_ENDIAN (BYTES_BIG_ENDIAN)
212 #define BITS_PER_WORD 32
213 #define UNITS_PER_WORD 4
214 #define MIN_UNITS_PER_WORD 4
215 #define INT_TYPE_SIZE 32
216 #define SHORT_TYPE_SIZE 16
217 #define LONG_TYPE_SIZE 32
218 #define LONG_LONG_TYPE_SIZE 64
219 #define FLOAT_TYPE_SIZE 32
220 #define DOUBLE_TYPE_SIZE 64
221 #define LONG_DOUBLE_TYPE_SIZE 64
222 #define POINTER_SIZE 32
223 #define PARM_BOUNDARY 32
224 #define FUNCTION_BOUNDARY 32
225 #define EMPTY_FIELD_BOUNDARY 32
226 #define STRUCTURE_SIZE_BOUNDARY 8
227 #define BIGGEST_ALIGNMENT 32
228 #define STRICT_ALIGNMENT 1
229 #define PCC_BITFIELD_TYPE_MATTERS 1
230
231 #undef SIZE_TYPE
232 #define SIZE_TYPE "unsigned int"
233
234 #undef PTRDIFF_TYPE
235 #define PTRDIFF_TYPE "int"
236
237 #define DATA_ALIGNMENT(TYPE, ALIGN) \
238 ((((ALIGN) < BITS_PER_WORD) \
239 && (TREE_CODE (TYPE) == ARRAY_TYPE \
240 || TREE_CODE (TYPE) == UNION_TYPE \
241 || TREE_CODE (TYPE) == RECORD_TYPE)) ? BITS_PER_WORD : (ALIGN))
242
243 #define LOCAL_ALIGNMENT(TYPE, ALIGN) \
244 (((TREE_CODE (TYPE) == ARRAY_TYPE \
245 && TYPE_MODE (TREE_TYPE (TYPE)) == QImode) \
246 && (ALIGN) < BITS_PER_WORD) ? BITS_PER_WORD : (ALIGN))
247
248 #define WORD_REGISTER_OPERATIONS 1
249
250 #define LOAD_EXTEND_OP(MODE) ZERO_EXTEND
251
252 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE) \
253 if (GET_MODE_CLASS (MODE) == MODE_INT \
254 && GET_MODE_SIZE (MODE) < 4) \
255 (MODE) = SImode;
256
257 /* Standard register usage. */
258
259 /* On the MicroBlaze, we have 32 integer registers */
260
261 #define FIRST_PSEUDO_REGISTER 36
262
263 #define FIXED_REGISTERS \
264 { \
265 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, \
266 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
267 1, 1, 1, 1 \
268 }
269
270 #define CALL_USED_REGISTERS \
271 { \
272 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
273 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
274 1, 1, 1, 1 \
275 }
276 #define GP_REG_FIRST 0
277 #define GP_REG_LAST 31
278 #define GP_REG_NUM (GP_REG_LAST - GP_REG_FIRST + 1)
279 #define GP_DEBUGGER_FIRST 0
280
281 #define ST_REG 32
282 #define AP_REG_NUM 33
283 #define RAP_REG_NUM 34
284 #define FRP_REG_NUM 35
285
286 #define GP_REG_P(REGNO) ((unsigned) ((REGNO) - GP_REG_FIRST) < GP_REG_NUM)
287 #define ST_REG_P(REGNO) ((REGNO) == ST_REG)
288
289 #define STACK_POINTER_REGNUM (GP_REG_FIRST + MB_ABI_STACK_POINTER_REGNUM)
290
291 #define STACK_POINTER_OFFSET FIRST_PARM_OFFSET(FNDECL)
292
293 /* Base register for access to local variables of the function. We
294 pretend that the frame pointer is
295 MB_ABI_INTR_RETURN_ADDR_REGNUM, and then eliminate it
296 to HARD_FRAME_POINTER_REGNUM. We can get away with this because
297 rMB_ABI_INTR_RETUREN_ADDR_REGNUM is a fixed
298 register(return address for interrupt), and will not be used for
299 anything else. */
300
301 #define FRAME_POINTER_REGNUM FRP_REG_NUM
302 #define HARD_FRAME_POINTER_REGNUM \
303 (GP_REG_FIRST + MB_ABI_FRAME_POINTER_REGNUM)
304 #define ARG_POINTER_REGNUM AP_REG_NUM
305 #define RETURN_ADDRESS_POINTER_REGNUM RAP_REG_NUM
306 #define STATIC_CHAIN_REGNUM \
307 (GP_REG_FIRST + MB_ABI_STATIC_CHAIN_REGNUM)
308
309 /* registers used in prologue/epilogue code when the stack frame
310 is larger than 32K bytes. These registers must come from the
311 scratch register set, and not used for passing and returning
312 arguments and any other information used in the calling sequence
313 (such as pic). */
314
315 #define MICROBLAZE_TEMP1_REGNUM \
316 (GP_REG_FIRST + MB_ABI_TEMP1_REGNUM)
317
318 #define MICROBLAZE_TEMP2_REGNUM \
319 (GP_REG_FIRST + MB_ABI_TEMP2_REGNUM)
320
321 #define NO_FUNCTION_CSE 1
322
323 #define PIC_OFFSET_TABLE_REGNUM (GP_REG_FIRST + MB_ABI_PIC_ADDR_REGNUM)
324
325 enum reg_class
326 {
327 NO_REGS, /* no registers in set. */
328 GR_REGS, /* integer registers. */
329 ST_REGS, /* status register. */
330 ALL_REGS, /* all registers. */
331 LIM_REG_CLASSES /* max value + 1. */
332 };
333
334 #define N_REG_CLASSES (int) LIM_REG_CLASSES
335
336 #define GENERAL_REGS GR_REGS
337
338 #define REG_CLASS_NAMES \
339 { \
340 "NO_REGS", \
341 "GR_REGS", \
342 "ST_REGS", \
343 "ALL_REGS" \
344 }
345
346 #define REG_CLASS_CONTENTS \
347 { \
348 { 0x00000000, 0x00000000 }, /* no registers. */ \
349 { 0xffffffff, 0x00000000 }, /* integer registers. */ \
350 { 0x00000000, 0x00000001 }, /* status registers. */ \
351 { 0xffffffff, 0x0000000f } /* all registers. */ \
352 }
353
354 extern enum reg_class microblaze_regno_to_class[];
355
356 #define REGNO_REG_CLASS(REGNO) microblaze_regno_to_class[ (REGNO) ]
357
358 #define BASE_REG_CLASS GR_REGS
359
360 #define INDEX_REG_CLASS GR_REGS
361
362 #define GR_REG_CLASS_P(CLASS) ((CLASS) == GR_REGS)
363
364 /* REGISTER AND CONSTANT CLASSES */
365
366 #define SMALL_INT(X) ((unsigned HOST_WIDE_INT) (INTVAL (X) + 0x8000) < 0x10000)
367 #define LARGE_INT(X) \
368 (INTVAL (X) > 0 && UINTVAL (X) >= 0x80000000 && UINTVAL (X) <= 0xffffffff)
369 #define PLT_ADDR_P(X) (GET_CODE (X) == UNSPEC && XINT (X,1) == UNSPEC_PLT)
370 /* Test for a valid operand for a call instruction.
371 Don't allow the arg pointer register or virtual regs
372 since they may change into reg + const, which the patterns
373 can't handle yet. */
374 #define CALL_INSN_OP(X) (CONSTANT_ADDRESS_P (X) \
375 || (GET_CODE (X) == REG && X != arg_pointer_rtx\
376 && ! (REGNO (X) >= FIRST_PSEUDO_REGISTER \
377 && REGNO (X) <= LAST_VIRTUAL_REGISTER)))
378
379 /* True if VALUE is a signed 16-bit number. */
380 #define SMALL_OPERAND(VALUE) \
381 ((unsigned HOST_WIDE_INT) (VALUE) + 0x8000 < 0x10000)
382
383 /* Constant which cannot be loaded in one instruction. */
384 #define LARGE_OPERAND(VALUE) \
385 ((((VALUE) & ~0x0000ffff) != 0) \
386 && (((VALUE) & ~0x0000ffff) != ~0x0000ffff) \
387 && (((VALUE) & 0x0000ffff) != 0 \
388 || (((VALUE) & ~2147483647) != 0 \
389 && ((VALUE) & ~2147483647) != ~2147483647)))
390
391 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
392 ((CLASS) != ALL_REGS \
393 ? (CLASS) \
394 : ((GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT \
395 || GET_MODE_CLASS (GET_MODE (X)) == MODE_COMPLEX_FLOAT) \
396 ? (GR_REGS) \
397 : ((GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
398 || GET_MODE (X) == VOIDmode) \
399 ? (GR_REGS) : (CLASS))))
400
401 /* Stack layout; function entry, exit and calling. */
402
403 #define STACK_GROWS_DOWNWARD 1
404
405 /* The return address for the current frame is in r31 if this is a leaf
406 function. Otherwise, it is on the stack. It is at a variable offset
407 from sp/fp/ap, so we define a fake hard register rap which is a
408 poiner to the return address on the stack. This always gets eliminated
409 during reload to be either the frame pointer or the stack pointer plus
410 an offset. */
411
412 #define RETURN_ADDR_RTX(count, frame) \
413 microblaze_return_addr(count,frame)
414
415 extern struct microblaze_frame_info current_frame_info;
416
417 #define ELIMINABLE_REGS \
418 {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
419 { ARG_POINTER_REGNUM, GP_REG_FIRST + MB_ABI_FRAME_POINTER_REGNUM}, \
420 { RETURN_ADDRESS_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
421 { RETURN_ADDRESS_POINTER_REGNUM, \
422 GP_REG_FIRST + MB_ABI_FRAME_POINTER_REGNUM}, \
423 { RETURN_ADDRESS_POINTER_REGNUM, \
424 GP_REG_FIRST + MB_ABI_SUB_RETURN_ADDR_REGNUM}, \
425 { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
426 { FRAME_POINTER_REGNUM, GP_REG_FIRST + MB_ABI_FRAME_POINTER_REGNUM}}
427
428 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
429 (OFFSET) = microblaze_initial_elimination_offset ((FROM), (TO))
430
431 #define ACCUMULATE_OUTGOING_ARGS 1
432
433 #define FIRST_PARM_OFFSET(FNDECL) (UNITS_PER_WORD)
434
435 #define ARG_POINTER_CFA_OFFSET(FNDECL) 0
436
437 #define REG_PARM_STACK_SPACE(FNDECL) (MAX_ARGS_IN_REGISTERS * UNITS_PER_WORD)
438
439 #define OUTGOING_REG_PARM_STACK_SPACE(FNTYPE) 1
440
441 #define STACK_BOUNDARY 32
442
443 #define NUM_OF_ARGS 6
444
445 #define GP_RETURN (GP_REG_FIRST + MB_ABI_INT_RETURN_VAL_REGNUM)
446
447 #define GP_ARG_FIRST (GP_REG_FIRST + MB_ABI_FIRST_ARG_REGNUM)
448 #define GP_ARG_LAST (GP_REG_FIRST + MB_ABI_LAST_ARG_REGNUM)
449
450 #define MAX_ARGS_IN_REGISTERS MB_ABI_MAX_ARG_REGS
451
452 #define LIBCALL_VALUE(MODE) \
453 gen_rtx_REG ( \
454 ((GET_MODE_CLASS (MODE) != MODE_INT \
455 || GET_MODE_SIZE (MODE) >= 4) \
456 ? (MODE) \
457 : SImode), GP_RETURN)
458
459 /* 1 if N is a possible register number for a function value.
460 On the MicroBlaze, R2 R3 are the only register thus used.
461 Currently, R2 are only implemented here (C has no complex type) */
462
463 #define FUNCTION_VALUE_REGNO_P(N) ((N) == GP_RETURN)
464
465 #define FUNCTION_ARG_REGNO_P(N) (((N) >= GP_ARG_FIRST && (N) <= GP_ARG_LAST))
466
467 typedef struct microblaze_args
468 {
469 int gp_reg_found; /* whether a gp register was found yet */
470 int arg_number; /* argument number */
471 int arg_words; /* # total words the arguments take */
472 int fp_arg_words; /* # words for FP args */
473 int last_arg_fp; /* nonzero if last arg was FP (EABI only) */
474 int fp_code; /* Mode of FP arguments */
475 int num_adjusts; /* number of adjustments made */
476 /* Adjustments made to args pass in regs. */
477 /* ??? The size is doubled to work around a bug in the code that sets the
478 adjustments in function_arg. */
479 rtx adjust[MAX_ARGS_IN_REGISTERS * 2];
480 } CUMULATIVE_ARGS;
481
482 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,FNDECL,N_NAMED_ARGS) \
483 init_cumulative_args (&CUM, FNTYPE, LIBNAME)
484
485 #define NO_PROFILE_COUNTERS 1
486
487 #define FUNCTION_PROFILER(FILE, LABELNO) { \
488 { \
489 fprintf (FILE, "\tbrki\tr16,_mcount\n"); \
490 } \
491 }
492
493 #define EXIT_IGNORE_STACK 1
494
495 /* 4 insns + 2 words of data. */
496 #define TRAMPOLINE_SIZE (6 * 4)
497
498 #define TRAMPOLINE_ALIGNMENT 32
499
500 #define REGNO_OK_FOR_BASE_P(regno) microblaze_regno_ok_for_base_p ((regno), 1)
501
502 #define REGNO_OK_FOR_INDEX_P(regno) microblaze_regno_ok_for_base_p ((regno), 1)
503
504 #ifndef REG_OK_STRICT
505 #define REG_STRICT_FLAG 0
506 #else
507 #define REG_STRICT_FLAG 1
508 #endif
509
510 #define REG_OK_FOR_BASE_P(X) \
511 microblaze_regno_ok_for_base_p (REGNO (X), REG_STRICT_FLAG)
512
513 #define REG_OK_FOR_INDEX_P(X) \
514 microblaze_regno_ok_for_base_p (REGNO (X), REG_STRICT_FLAG)
515
516 #define MAX_REGS_PER_ADDRESS 2
517
518
519 /* Identify valid constant addresses. Exclude if PIC addr which
520 needs scratch register. */
521 #define CONSTANT_ADDRESS_P(X) microblaze_constant_address_p(X)
522
523 /* Define this, so that when PIC, reload won't try to reload invalid
524 addresses which require two reload registers. */
525 #define LEGITIMATE_PIC_OPERAND_P(X) microblaze_legitimate_pic_operand (X)
526
527 #define CASE_VECTOR_MODE (SImode)
528
529 #ifndef DEFAULT_SIGNED_CHAR
530 #define DEFAULT_SIGNED_CHAR 1
531 #endif
532
533 #define MOVE_MAX 4
534 #define MAX_MOVE_MAX 8
535
536 #define SLOW_BYTE_ACCESS 1
537
538 /* sCOND operations return 1. */
539 #define STORE_FLAG_VALUE 1
540
541 #define SHIFT_COUNT_TRUNCATED 1
542
543 #define Pmode SImode
544
545 #define FUNCTION_MODE SImode
546
547 /* Mode should always be SImode */
548 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
549 ( GR_REG_CLASS_P (FROM) && GR_REG_CLASS_P (TO) ? 2 \
550 : (FROM) == ST_REGS && GR_REG_CLASS_P (TO) ? 4 \
551 : 12)
552
553 #define MEMORY_MOVE_COST(MODE,CLASS,TO_P) \
554 (4 + memory_move_secondary_cost ((MODE), (CLASS), (TO_P)))
555
556 #define BRANCH_COST(speed_p, predictable_p) 2
557
558 /* Control the assembler format that we output. */
559 #define ASM_APP_ON " #APP\n"
560 #define ASM_APP_OFF " #NO_APP\n"
561
562 #define REGISTER_NAMES { \
563 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
564 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
565 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
566 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
567 "rmsr", "$ap", "$rap", "$frp" }
568
569 #define ADDITIONAL_REGISTER_NAMES \
570 { \
571 { "r0", 0 + GP_REG_FIRST }, \
572 { "r1", 1 + GP_REG_FIRST }, \
573 { "r2", 2 + GP_REG_FIRST }, \
574 { "r3", 3 + GP_REG_FIRST }, \
575 { "r4", 4 + GP_REG_FIRST }, \
576 { "r5", 5 + GP_REG_FIRST }, \
577 { "r6", 6 + GP_REG_FIRST }, \
578 { "r7", 7 + GP_REG_FIRST }, \
579 { "r8", 8 + GP_REG_FIRST }, \
580 { "r9", 9 + GP_REG_FIRST }, \
581 { "r10", 10 + GP_REG_FIRST }, \
582 { "r11", 11 + GP_REG_FIRST }, \
583 { "r12", 12 + GP_REG_FIRST }, \
584 { "r13", 13 + GP_REG_FIRST }, \
585 { "r14", 14 + GP_REG_FIRST }, \
586 { "r15", 15 + GP_REG_FIRST }, \
587 { "r16", 16 + GP_REG_FIRST }, \
588 { "r17", 17 + GP_REG_FIRST }, \
589 { "r18", 18 + GP_REG_FIRST }, \
590 { "r19", 19 + GP_REG_FIRST }, \
591 { "r20", 20 + GP_REG_FIRST }, \
592 { "r21", 21 + GP_REG_FIRST }, \
593 { "r22", 22 + GP_REG_FIRST }, \
594 { "r23", 23 + GP_REG_FIRST }, \
595 { "r24", 24 + GP_REG_FIRST }, \
596 { "r25", 25 + GP_REG_FIRST }, \
597 { "r26", 26 + GP_REG_FIRST }, \
598 { "r27", 27 + GP_REG_FIRST }, \
599 { "r28", 28 + GP_REG_FIRST }, \
600 { "r29", 29 + GP_REG_FIRST }, \
601 { "r30", 30 + GP_REG_FIRST }, \
602 { "r31", 31 + GP_REG_FIRST }, \
603 { "rmsr", ST_REG} \
604 }
605
606 #define PRINT_OPERAND(FILE, X, CODE) print_operand (FILE, X, CODE)
607
608 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) microblaze_print_operand_punct[CODE]
609
610 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) print_operand_address (FILE, ADDR)
611
612 /* ASM_OUTPUT_ALIGNED_COMMON and ASM_OUTPUT_ALIGNED_LOCAL
613
614 Unfortunately, we still need to set the section explicitly. Somehow,
615 our binutils assign .comm and .lcomm variables to the "current" section
616 in the assembly file, rather than where they implicitly belong. We need to
617 remove this explicit setting in GCC when binutils can understand sections
618 better. */
619 #undef ASM_OUTPUT_ALIGNED_COMMON
620 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
621 do { \
622 if ((SIZE) > 0 && (SIZE) <= INT_MAX \
623 && (int) (SIZE) <= microblaze_section_threshold \
624 && TARGET_XLGPOPT) \
625 { \
626 switch_to_section (sbss_section); \
627 } \
628 else \
629 { \
630 switch_to_section (bss_section); \
631 } \
632 fprintf (FILE, "%s", COMMON_ASM_OP); \
633 assemble_name ((FILE), (NAME)); \
634 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
635 (SIZE), (ALIGN) / BITS_PER_UNIT); \
636 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
637 } while (0)
638
639 #undef ASM_OUTPUT_ALIGNED_LOCAL
640 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
641 do { \
642 if ((SIZE) > 0 && (SIZE) <= INT_MAX \
643 && (int) (SIZE) <= microblaze_section_threshold \
644 && TARGET_XLGPOPT) \
645 { \
646 switch_to_section (sbss_section); \
647 } \
648 else \
649 { \
650 switch_to_section (bss_section); \
651 } \
652 fprintf (FILE, "%s", LCOMMON_ASM_OP); \
653 assemble_name ((FILE), (NAME)); \
654 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
655 (SIZE), (ALIGN) / BITS_PER_UNIT); \
656 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
657 } while (0)
658
659 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
660 do { \
661 ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN); \
662 } while (0)
663
664 #define ASM_DECLARE_FUNCTION_NAME(STREAM,NAME,DECL) \
665 { \
666 }
667
668 #undef TARGET_ASM_CONSTRUCTOR
669 #define TARGET_ASM_CONSTRUCTOR microblaze_elf_asm_constructor
670
671 #undef TARGET_ASM_DESTRUCTOR
672 #define TARGET_ASM_DESTRUCTOR microblaze_elf_asm_destructor
673
674 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
675 sprintf ((LABEL), "*%s%s%ld", (LOCAL_LABEL_PREFIX), (PREFIX), (long)(NUM))
676
677 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
678 fprintf (STREAM, "\t%s\t%sL%d\n", \
679 ".gpword", \
680 LOCAL_LABEL_PREFIX, VALUE)
681
682 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
683 do { \
684 if (flag_pic == 2) \
685 fprintf (STREAM, "\t%s\t%sL%d@GOTOFF\n", \
686 ".gpword", \
687 LOCAL_LABEL_PREFIX, VALUE); \
688 else \
689 fprintf (STREAM, "\t%s\t%sL%d\n", \
690 ".gpword", \
691 LOCAL_LABEL_PREFIX, VALUE); \
692 } while (0)
693
694 #define ASM_OUTPUT_ALIGN(STREAM,LOG) \
695 fprintf (STREAM, "\t.align\t%d\n", (LOG))
696
697 #define ASM_OUTPUT_SKIP(STREAM,SIZE) \
698 fprintf (STREAM, "\t.space\t" HOST_WIDE_INT_PRINT_UNSIGNED "\n", (SIZE))
699
700 #define ASCII_DATA_ASM_OP "\t.ascii\t"
701 #define STRING_ASM_OP "\t.asciz\t"
702
703 #undef TARGET_ASM_OUTPUT_IDENT
704 #define TARGET_ASM_OUTPUT_IDENT microblaze_asm_output_ident
705
706 /* Default to -G 8 */
707 #ifndef MICROBLAZE_DEFAULT_GVALUE
708 #define MICROBLAZE_DEFAULT_GVALUE 8
709 #endif
710
711 /* Given a decl node or constant node, choose the section to output it in
712 and select that section. */
713
714 /* Store in OUTPUT a string (made with alloca) containing
715 an assembler-name for a local static variable named NAME.
716 LABELNO is an integer which is different for each call. */
717 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
718 ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 13), \
719 sprintf ((OUTPUT), "%s.%lu", (NAME), (unsigned long)(LABELNO)))
720
721 /* How to start an assembler comment.
722 The leading space is important (the microblaze assembler requires it). */
723 #ifndef ASM_COMMENT_START
724 #define ASM_COMMENT_START " #"
725 #endif
726
727 #define BSS_VAR 1
728 #define SBSS_VAR 2
729 #define DATA_VAR 4
730 #define SDATA_VAR 5
731 #define RODATA_VAR 6
732 #define SDATA2_VAR 7
733
734 /* These definitions are used in with the shift_type flag in the rtl. */
735 #define SHIFT_CONST 1
736 #define SHIFT_REG 2
737 #define USE_ADDK 3
738
739 /* Handle interrupt attribute. */
740 extern int interrupt_handler;
741 extern int fast_interrupt;
742 extern int save_volatiles;
743
744 #define INTERRUPT_HANDLER_NAME "_interrupt_handler"
745 /* The function name for the function tagged with attribute break_handler
746 has been set in the RTL as _break_handler. This function name is used
747 in the generation of directives .ent .end and .global. */
748 #define BREAK_HANDLER_NAME "_break_handler"
749 #define FAST_INTERRUPT_NAME "_fast_interrupt"
750
751 /* The following #defines are used in the headers files. Always retain these. */
752
753 /* Added for declaring size at the end of the function. */
754 #undef ASM_DECLARE_FUNCTION_SIZE
755 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
756 do { \
757 if (!flag_inhibit_size_directive) \
758 { \
759 char label[256]; \
760 static int labelno; \
761 labelno++; \
762 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
763 (*targetm.asm_out.internal_label) (FILE, "Lfe", labelno); \
764 fprintf (FILE, "%s", SIZE_ASM_OP); \
765 assemble_name (FILE, (FNAME)); \
766 fprintf (FILE, ","); \
767 assemble_name (FILE, label); \
768 fprintf (FILE, "-"); \
769 assemble_name (FILE, (FNAME)); \
770 putc ('\n', FILE); \
771 } \
772 } while (0)
773
774 #define GLOBAL_ASM_OP "\t.globl\t"
775 #define TYPE_ASM_OP "\t.type\t"
776 #define SIZE_ASM_OP "\t.size\t"
777 #define COMMON_ASM_OP "\t.comm\t"
778 #define LCOMMON_ASM_OP "\t.lcomm\t"
779
780 #define MAX_OFILE_ALIGNMENT (32768*8)
781
782 #define TYPE_OPERAND_FMT "@%s"
783
784 /* Write the extra assembler code needed to declare an object properly. */
785 #undef ASM_DECLARE_OBJECT_NAME
786 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
787 do { \
788 fprintf (FILE, "%s", TYPE_ASM_OP); \
789 assemble_name (FILE, NAME); \
790 putc (',', FILE); \
791 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
792 putc ('\n', FILE); \
793 size_directive_output = 0; \
794 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
795 { \
796 size_directive_output = 1; \
797 fprintf (FILE, "%s", SIZE_ASM_OP); \
798 assemble_name (FILE, NAME); \
799 fprintf (FILE, "," HOST_WIDE_INT_PRINT_DEC "\n", \
800 int_size_in_bytes (TREE_TYPE (DECL))); \
801 } \
802 microblaze_declare_object (FILE, NAME, "", ":\n", 0); \
803 } while (0)
804
805 #undef ASM_FINISH_DECLARE_OBJECT
806 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
807 do { \
808 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
809 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
810 && ! AT_END && TOP_LEVEL \
811 && DECL_INITIAL (DECL) == error_mark_node \
812 && !size_directive_output) \
813 { \
814 size_directive_output = 1; \
815 fprintf (FILE, "%s", SIZE_ASM_OP); \
816 assemble_name (FILE, name); \
817 fprintf (FILE, "," HOST_WIDE_INT_PRINT_DEC "\n", \
818 int_size_in_bytes (TREE_TYPE (DECL))); \
819 } \
820 } while (0)
821
822 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
823 do { fputc ( '\t', FILE); \
824 assemble_name (FILE, LABEL1); \
825 fputs ( " = ", FILE); \
826 assemble_name (FILE, LABEL2); \
827 fputc ( '\n', FILE); \
828 } while (0)
829
830 #define ASM_WEAKEN_LABEL(FILE,NAME) \
831 do { fputs ("\t.weakext\t", FILE); \
832 assemble_name (FILE, NAME); \
833 fputc ('\n', FILE); \
834 } while (0)
835
836 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
837 #undef UNIQUE_SECTION_P
838 #define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL))
839
840 #undef TARGET_ASM_NAMED_SECTION
841 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
842
843 /* Define the strings to put out for each section in the object file.
844
845 Note: For ctors/dtors, we want to give these sections the SHF_WRITE
846 attribute to allow shared libraries to patch/resolve addresses into
847 these locations. On Microblaze, there is no concept of shared libraries
848 yet, so this is for future use. */
849 #define TEXT_SECTION_ASM_OP "\t.text"
850 #define DATA_SECTION_ASM_OP "\t.data"
851 #define READONLY_DATA_SECTION_ASM_OP \
852 "\t.rodata"
853 #define BSS_SECTION_ASM_OP "\t.bss"
854 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\""
855 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\""
856 #define INIT_SECTION_ASM_OP "\t.section\t.init,\"ax\""
857 #define FINI_SECTION_ASM_OP "\t.section\t.fini,\"ax\""
858
859 #define SDATA_SECTION_ASM_OP "\t.sdata" /* Small RW initialized data */
860 #define SDATA2_SECTION_ASM_OP "\t.sdata2" /* Small RO initialized data */
861 #define SBSS_SECTION_ASM_OP "\t.sbss" /* Small RW uninitialized data */
862 #define SBSS2_SECTION_ASM_OP "\t.sbss2" /* Small RO uninitialized data */
863
864 /* We do this to save a few 10s of code space that would be taken up
865 by the call_FUNC () wrappers, used by the generic CRT_CALL_STATIC_FUNCTION
866 definition in crtstuff.c. */
867 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
868 asm ( SECTION_OP "\n" \
869 "\tbrlid r15, " #FUNC "\n\t nop\n" \
870 TEXT_SECTION_ASM_OP);
871
872 /* We need to group -lm as well, since some Newlib math functions
873 reference __errno! */
874 #undef LIB_SPEC
875 #define LIB_SPEC \
876 "%{!nostdlib: \
877 %{pg:-start-group -lxilprofile -lgloss -lxil -lc -lm -end-group } \
878 %{!pg:-start-group -lgloss -lxil -lc -lm -end-group }} "
879
880 /* microblaze-unknown-elf target has no support of C99 runtime */
881 #undef TARGET_LIBC_HAS_FUNCTION
882 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
883
884 #undef ENDFILE_SPEC
885 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
886
887 #define STARTFILE_EXECUTABLE_SPEC "crt0.o%s crti.o%s crtbegin.o%s"
888 #define STARTFILE_XMDSTUB_SPEC "crt1.o%s crti.o%s crtbegin.o%s"
889 #define STARTFILE_BOOTSTRAP_SPEC "crt2.o%s crti.o%s crtbegin.o%s"
890 #define STARTFILE_NOVECTORS_SPEC "crt3.o%s crti.o%s crtbegin.o%s"
891 #define STARTFILE_CRTINIT_SPEC "%{!pg: %{!mno-clearbss: crtinit.o%s} \
892 %{mno-clearbss: sim-crtinit.o%s}} \
893 %{pg: %{!mno-clearbss: pgcrtinit.o%s} %{mno-clearbss: sim-pgcrtinit.o%s}}"
894
895 #define STARTFILE_DEFAULT_SPEC STARTFILE_EXECUTABLE_SPEC
896
897 #undef SUBTARGET_EXTRA_SPECS
898 #define SUBTARGET_EXTRA_SPECS \
899 { "startfile_executable", STARTFILE_EXECUTABLE_SPEC }, \
900 { "startfile_xmdstub", STARTFILE_XMDSTUB_SPEC }, \
901 { "startfile_bootstrap", STARTFILE_BOOTSTRAP_SPEC }, \
902 { "startfile_novectors", STARTFILE_NOVECTORS_SPEC }, \
903 { "startfile_crtinit", STARTFILE_CRTINIT_SPEC }, \
904 { "startfile_default", STARTFILE_DEFAULT_SPEC },
905
906 #undef STARTFILE_SPEC
907 #define STARTFILE_SPEC "\
908 %{Zxl-mode-executable : %(startfile_executable) ; \
909 mxl-mode-executable : %(startfile_executable) ; \
910 Zxl-mode-xmdstub : %(startfile_xmdstub) ; \
911 mxl-mode-xmdstub : %(startfile_xmdstub) ; \
912 Zxl-mode-bootstrap : %(startfile_bootstrap) ; \
913 mxl-mode-bootstrap : %(startfile_bootstrap) ; \
914 Zxl-mode-novectors : %(startfile_novectors) ; \
915 mxl-mode-novectors : %(startfile_novectors) ; \
916 Zxl-mode-xilkernel : %(startfile_xilkernel) ; \
917 mxl-mode-xilkernel : %(startfile_xilkernel) ; \
918 : %(startfile_default) \
919 } \
920 %(startfile_crtinit)"