1 /* Definitions of target machine for GCC for Motorola 680x0/ColdFire.
2 Copyright (C) 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
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/>. */
22 /* We need to have MOTOROLA always defined (either 0 or 1) because we use
23 if-statements and ?: on it. This way we have compile-time error checking
24 for both the MOTOROLA and MIT code paths. We do rely on the host compiler
25 to optimize away all constant tests. */
26 #if MOTOROLA /* Use the Motorola assembly syntax. */
27 # define TARGET_VERSION fprintf (stderr, " (68k, Motorola syntax)")
29 # define MOTOROLA 0 /* Use the MIT assembly syntax. */
30 # define TARGET_VERSION fprintf (stderr, " (68k, MIT syntax)")
33 /* Handle --with-cpu default option from configure script. */
34 #define OPTION_DEFAULT_SPECS \
35 { "cpu", "%{!mc68000:%{!m68000:%{!m68302:%{!m68010:%{!mc68020:%{!m68020:\
36 %{!m68030:%{!m68040:%{!m68020-40:%{!m68020-60:%{!m68060:%{!mcpu32:\
37 %{!m68332:%{!m5200:%{!m5206e:%{!m528x:%{!m5307:%{!m5407:%{!mcfv4e:\
38 %{!mcpu=*:%{!march=*:-%(VALUE)}}}}}}}}}}}}}}}}}}}}}" },
40 /* Pass flags to gas indicating which type of processor we have. This
41 can be simplified when we can rely on the assembler supporting .cpu
42 and .arch directives. */
44 #define ASM_CPU_SPEC "\
45 %{m68851}%{mno-68851} %{m68881}%{mno-68881} %{msoft-float:-mno-float} \
46 %{m68000}%{m68302}%{mc68000}%{m68010}%{m68020}%{mc68020}%{m68030}\
47 %{m68040}%{m68020-40:-m68040}%{m68020-60:-m68040}\
48 %{m68060}%{mcpu32}%{m68332}%{m5200}%{m5206e}%{m528x}%{m5307}%{m5407}%{mcfv4e}\
49 %{mcpu=*:-mcpu=%*}%{march=*:-march=%*}\
51 #define ASM_PCREL_SPEC "%{fPIC|fpic|mpcrel:--pcrel} \
52 %{msep-data|mid-shared-library:--pcrel} \
55 #define ASM_SPEC "%(asm_cpu_spec) %(asm_pcrel_spec)"
58 { "asm_cpu_spec", ASM_CPU_SPEC }, \
59 { "asm_pcrel_spec", ASM_PCREL_SPEC }, \
62 #define SUBTARGET_EXTRA_SPECS
64 /* Note that some other tm.h files include this one and then override
65 many of the definitions that relate to assembler syntax. */
67 #define TARGET_CPU_CPP_BUILTINS() \
70 builtin_define ("__m68k__"); \
71 builtin_define_std ("mc68000"); \
72 /* The other mc680x0 macros have traditionally been derived \
73 from the tuning setting. For example, -m68020-60 defines \
74 m68060, even though it generates pure 68020 code. */ \
78 builtin_define_std ("mc68010"); \
82 builtin_define_std ("mc68020"); \
86 builtin_define_std ("mc68030"); \
90 builtin_define_std ("mc68040"); \
94 builtin_define_std ("mc68060"); \
98 builtin_define_std ("mc68060"); \
101 builtin_define_std ("mc68040"); \
102 builtin_define_std ("mc68030"); \
103 builtin_define_std ("mc68020"); \
107 builtin_define_std ("mc68332"); \
108 builtin_define_std ("mcpu32"); \
109 builtin_define_std ("mc68020"); \
113 builtin_define ("__mcfv1__"); \
117 builtin_define ("__mcfv2__"); \
121 builtin_define ("__mcfv3__"); \
125 builtin_define ("__mcfv4__"); \
129 builtin_define ("__mcfv4e__"); \
133 builtin_define ("__mcfv5__"); \
141 builtin_define ("__HAVE_68881__"); \
143 if (TARGET_COLDFIRE) \
147 tmp = m68k_cpp_cpu_ident ("cf"); \
149 builtin_define (tmp); \
150 tmp = m68k_cpp_cpu_family ("cf"); \
152 builtin_define (tmp); \
153 builtin_define ("__mcoldfire__"); \
156 builtin_define ("__mcfisac__"); \
157 else if (TARGET_ISAB) \
159 builtin_define ("__mcfisab__"); \
160 /* ISA_B: Legacy 5407 defines. */ \
161 builtin_define ("__mcf5400__"); \
162 builtin_define ("__mcf5407__"); \
164 else if (TARGET_ISAAPLUS) \
166 builtin_define ("__mcfisaaplus__"); \
167 /* ISA_A+: legacy defines. */ \
168 builtin_define ("__mcf528x__"); \
169 builtin_define ("__mcf5200__"); \
173 builtin_define ("__mcfisaa__"); \
174 /* ISA_A: legacy defines. */ \
178 builtin_define ("__mcf5200__"); \
182 builtin_define ("__mcf5307__"); \
183 builtin_define ("__mcf5300__"); \
192 if (TARGET_COLDFIRE_FPU) \
193 builtin_define ("__mcffpu__"); \
195 if (TARGET_CF_HWDIV) \
196 builtin_define ("__mcfhwdiv__"); \
199 builtin_define ("__mfido__"); \
201 builtin_assert ("cpu=m68k"); \
202 builtin_assert ("machine=m68k"); \
206 /* Classify the groups of pseudo-ops used to assemble QI, HI and SI
208 #define INT_OP_STANDARD 0 /* .byte, .short, .long */
209 #define INT_OP_DOT_WORD 1 /* .byte, .word, .long */
210 #define INT_OP_NO_DOT 2 /* byte, short, long */
211 #define INT_OP_DC 3 /* dc.b, dc.w, dc.l */
213 /* Set the default. */
214 #define INT_OP_GROUP INT_OP_DOT_WORD
216 /* Bit values used by m68k-devices.def to identify processor capabilities. */
217 #define FL_BITFIELD (1 << 0) /* Support bitfield instructions. */
218 #define FL_68881 (1 << 1) /* (Default) support for 68881/2. */
219 #define FL_COLDFIRE (1 << 2) /* ColdFire processor. */
220 #define FL_CF_HWDIV (1 << 3) /* ColdFire hardware divide supported. */
221 #define FL_CF_MAC (1 << 4) /* ColdFire MAC unit supported. */
222 #define FL_CF_EMAC (1 << 5) /* ColdFire eMAC unit supported. */
223 #define FL_CF_EMAC_B (1 << 6) /* ColdFire eMAC-B unit supported. */
224 #define FL_CF_USP (1 << 7) /* ColdFire User Stack Pointer supported. */
225 #define FL_CF_FPU (1 << 8) /* ColdFire FPU supported. */
226 #define FL_ISA_68000 (1 << 9)
227 #define FL_ISA_68010 (1 << 10)
228 #define FL_ISA_68020 (1 << 11)
229 #define FL_ISA_68040 (1 << 12)
230 #define FL_ISA_A (1 << 13)
231 #define FL_ISA_APLUS (1 << 14)
232 #define FL_ISA_B (1 << 15)
233 #define FL_ISA_C (1 << 16)
234 #define FL_FIDOA (1 << 17)
235 #define FL_MMU 0 /* Used by multilib machinery. */
236 #define FL_UCLINUX 0 /* Used by multilib machinery. */
238 #define TARGET_68010 ((m68k_cpu_flags & FL_ISA_68010) != 0)
239 #define TARGET_68020 ((m68k_cpu_flags & FL_ISA_68020) != 0)
240 #define TARGET_68040 ((m68k_cpu_flags & FL_ISA_68040) != 0)
241 #define TARGET_COLDFIRE ((m68k_cpu_flags & FL_COLDFIRE) != 0)
242 #define TARGET_COLDFIRE_FPU (m68k_fpu == FPUTYPE_COLDFIRE)
243 #define TARGET_68881 (m68k_fpu == FPUTYPE_68881)
244 #define TARGET_FIDOA ((m68k_cpu_flags & FL_FIDOA) != 0)
246 /* Size (in bytes) of FPU registers. */
247 #define TARGET_FP_REG_SIZE (TARGET_COLDFIRE ? 8 : 12)
249 #define TARGET_ISAAPLUS ((m68k_cpu_flags & FL_ISA_APLUS) != 0)
250 #define TARGET_ISAB ((m68k_cpu_flags & FL_ISA_B) != 0)
251 #define TARGET_ISAC ((m68k_cpu_flags & FL_ISA_C) != 0)
253 /* Some instructions are common to more than one ISA. */
254 #define ISA_HAS_MVS_MVZ (TARGET_ISAB || TARGET_ISAC)
255 #define ISA_HAS_FF1 (TARGET_ISAAPLUS || TARGET_ISAC)
257 #define TUNE_68000 (m68k_tune == u68000)
258 #define TUNE_68010 (m68k_tune == u68010)
259 #define TUNE_68000_10 (TUNE_68000 || TUNE_68010)
260 #define TUNE_68030 (m68k_tune == u68030 \
261 || m68k_tune == u68020_40 \
262 || m68k_tune == u68020_60)
263 #define TUNE_68040 (m68k_tune == u68040 \
264 || m68k_tune == u68020_40 \
265 || m68k_tune == u68020_60)
266 #define TUNE_68060 (m68k_tune == u68060 || m68k_tune == u68020_60)
267 #define TUNE_68040_60 (TUNE_68040 || TUNE_68060)
268 #define TUNE_CPU32 (m68k_tune == ucpu32)
269 #define TUNE_CFV1 (m68k_tune == ucfv1)
270 #define TUNE_CFV2 (m68k_tune == ucfv2)
271 #define TUNE_CFV3 (m68k_tune == ucfv3)
272 #define TUNE_CFV4 (m68k_tune == ucfv4 || m68k_tune == ucfv4e)
274 #define TUNE_MAC ((m68k_tune_flags & FL_CF_MAC) != 0)
275 #define TUNE_EMAC ((m68k_tune_flags & FL_CF_EMAC) != 0)
277 #define OVERRIDE_OPTIONS override_options()
279 /* These are meant to be redefined in the host dependent files */
280 #define SUBTARGET_OVERRIDE_OPTIONS
282 /* target machine storage layout */
284 /* "long double" is the same as "double" on ColdFire and fido
287 #define LONG_DOUBLE_TYPE_SIZE \
288 ((TARGET_COLDFIRE || TARGET_FIDOA) ? 64 : 80)
290 /* We need to know the size of long double at compile-time in libgcc2. */
292 #if defined(__mcoldfire__) || defined(__mfido__)
293 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
295 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
298 /* Set the value of FLT_EVAL_METHOD in float.h. When using 68040 fp
299 instructions, we get proper intermediate rounding, otherwise we
300 get extended precision results. */
301 #define TARGET_FLT_EVAL_METHOD ((TARGET_68040 || ! TARGET_68881) ? 0 : 2)
303 #define BITS_BIG_ENDIAN 1
304 #define BYTES_BIG_ENDIAN 1
305 #define WORDS_BIG_ENDIAN 1
307 #define UNITS_PER_WORD 4
309 #define PARM_BOUNDARY (TARGET_SHORT ? 16 : 32)
310 #define STACK_BOUNDARY 16
311 #define FUNCTION_BOUNDARY 16
312 #define EMPTY_FIELD_BOUNDARY 16
313 /* ColdFire and fido strongly prefer a 32-bit aligned stack. */
314 #define PREFERRED_STACK_BOUNDARY \
315 ((TARGET_COLDFIRE || TARGET_FIDOA) ? 32 : 16)
317 /* No data type wants to be aligned rounder than this.
318 Most published ABIs say that ints should be aligned on 16-bit
319 boundaries, but CPUs with 32-bit busses get better performance
320 aligned on 32-bit boundaries. */
321 #define BIGGEST_ALIGNMENT (TARGET_ALIGN_INT ? 32 : 16)
323 #define STRICT_ALIGNMENT (TARGET_STRICT_ALIGNMENT)
324 #define M68K_HONOR_TARGET_STRICT_ALIGNMENT 1
326 #define DWARF_CIE_DATA_ALIGNMENT -2
328 #define INT_TYPE_SIZE (TARGET_SHORT ? 16 : 32)
330 /* Define these to avoid dependence on meaning of `int'. */
331 #define WCHAR_TYPE "long int"
332 #define WCHAR_TYPE_SIZE 32
334 /* Maximum number of library IDs we permit with -mid-shared-library. */
335 #define MAX_LIBRARY_ID 255
338 /* Standard register usage. */
340 /* For the m68k, we give the data registers numbers 0-7,
341 the address registers numbers 010-017 (8-15),
342 and the 68881 floating point registers numbers 020-027 (16-23).
343 We also have a fake `arg-pointer' register 030 (24) used for
344 register elimination. */
345 #define FIRST_PSEUDO_REGISTER 25
347 /* All m68k targets (except AmigaOS) use %a5 as the PIC register */
348 #define PIC_OFFSET_TABLE_REGNUM \
349 (!flag_pic ? INVALID_REGNUM \
350 : reload_completed ? REGNO (pic_offset_table_rtx) \
353 /* 1 for registers that have pervasive standard uses
354 and are not available for the register allocator.
355 On the m68k, only the stack pointer is such.
356 Our fake arg-pointer is obviously fixed as well. */
357 #define FIXED_REGISTERS \
358 {/* Data registers. */ \
359 0, 0, 0, 0, 0, 0, 0, 0, \
361 /* Address registers. */ \
362 0, 0, 0, 0, 0, 0, 0, 1, \
364 /* Floating point registers \
366 0, 0, 0, 0, 0, 0, 0, 0, \
371 /* 1 for registers not available across function calls.
372 These must include the FIXED_REGISTERS and also any
373 registers that can be used without being saved.
374 The latter must include the registers where values are returned
375 and the register where structure-value addresses are passed.
376 Aside from that, you can include as many other registers as you like. */
377 #define CALL_USED_REGISTERS \
378 {/* Data registers. */ \
379 1, 1, 0, 0, 0, 0, 0, 0, \
381 /* Address registers. */ \
382 1, 1, 0, 0, 0, 0, 0, 1, \
384 /* Floating point registers \
386 1, 1, 0, 0, 0, 0, 0, 0, \
391 #define REG_ALLOC_ORDER \
392 { /* d0/d1/a0/a1 */ \
397 10, 11, 12, 13, 14, 15, 24, \
399 16, 17, 18, 19, 20, 21, 22, 23\
403 /* Make sure everything's fine if we *don't* have a given processor.
404 This assumes that putting a register in fixed_regs will keep the
405 compiler's mitts completely off it. We don't bother to zero it out
406 of register classes. */
407 #define CONDITIONAL_REGISTER_USAGE \
411 if (!TARGET_HARD_FLOAT) \
413 COPY_HARD_REG_SET (x, reg_class_contents[(int)FP_REGS]); \
414 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) \
415 if (TEST_HARD_REG_BIT (x, i)) \
416 fixed_regs[i] = call_used_regs[i] = 1; \
419 fixed_regs[PIC_REG] = call_used_regs[PIC_REG] = 1; \
422 /* On the m68k, ordinary registers hold 32 bits worth;
423 for the 68881 registers, a single register is always enough for
424 anything that can be stored in them at all. */
425 #define HARD_REGNO_NREGS(REGNO, MODE) \
426 ((REGNO) >= 16 ? GET_MODE_NUNITS (MODE) \
427 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
429 /* A C expression that is nonzero if hard register NEW_REG can be
430 considered for use as a rename register for OLD_REG register. */
432 #define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
433 m68k_hard_regno_rename_ok (OLD_REG, NEW_REG)
435 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
436 m68k_regno_mode_ok ((REGNO), (MODE))
438 #define SECONDARY_RELOAD_CLASS(CLASS, MODE, X) \
439 m68k_secondary_reload_class (CLASS, MODE, X)
441 #define MODES_TIEABLE_P(MODE1, MODE2) \
442 (! TARGET_HARD_FLOAT \
443 || ((GET_MODE_CLASS (MODE1) == MODE_FLOAT \
444 || GET_MODE_CLASS (MODE1) == MODE_COMPLEX_FLOAT) \
445 == (GET_MODE_CLASS (MODE2) == MODE_FLOAT \
446 || GET_MODE_CLASS (MODE2) == MODE_COMPLEX_FLOAT)))
448 /* Specify the registers used for certain standard purposes.
449 The values of these macros are register numbers. */
451 #define STACK_POINTER_REGNUM SP_REG
453 /* Most m68k targets use %a6 as a frame pointer. The AmigaOS
454 ABI uses %a6 for shared library calls, therefore the frame
455 pointer is shifted to %a5 on this target. */
456 #define FRAME_POINTER_REGNUM A6_REG
458 /* Base register for access to arguments of the function.
459 * This isn't a hardware register. It will be eliminated to the
460 * stack pointer or frame pointer.
462 #define ARG_POINTER_REGNUM 24
464 #define STATIC_CHAIN_REGNUM A0_REG
465 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a0"
467 /* Register in which address to store a structure value
468 is passed to a function. */
469 #define M68K_STRUCT_VALUE_REGNUM A1_REG
473 /* The m68k has three kinds of registers, so eight classes would be
474 a complete set. One of them is not needed. */
478 GENERAL_REGS, DATA_OR_FP_REGS,
479 ADDR_OR_FP_REGS, ALL_REGS,
482 #define N_REG_CLASSES (int) LIM_REG_CLASSES
484 #define REG_CLASS_NAMES \
485 { "NO_REGS", "DATA_REGS", \
486 "ADDR_REGS", "FP_REGS", \
487 "GENERAL_REGS", "DATA_OR_FP_REGS", \
488 "ADDR_OR_FP_REGS", "ALL_REGS" }
490 #define REG_CLASS_CONTENTS \
492 {0x00000000}, /* NO_REGS */ \
493 {0x000000ff}, /* DATA_REGS */ \
494 {0x0100ff00}, /* ADDR_REGS */ \
495 {0x00ff0000}, /* FP_REGS */ \
496 {0x0100ffff}, /* GENERAL_REGS */ \
497 {0x00ff00ff}, /* DATA_OR_FP_REGS */ \
498 {0x01ffff00}, /* ADDR_OR_FP_REGS */ \
499 {0x01ffffff}, /* ALL_REGS */ \
502 extern enum reg_class regno_reg_class[];
503 #define REGNO_REG_CLASS(REGNO) (regno_reg_class[(REGNO)])
504 #define INDEX_REG_CLASS GENERAL_REGS
505 #define BASE_REG_CLASS ADDR_REGS
507 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
508 m68k_preferred_reload_class (X, CLASS)
510 /* On the m68k, this is the size of MODE in words,
511 except in the FP regs, where a single reg is always enough. */
512 #define CLASS_MAX_NREGS(CLASS, MODE) \
513 ((CLASS) == FP_REGS ? 1 \
514 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
516 /* Moves between fp regs and other regs are two insns. */
517 #define REGISTER_MOVE_COST(MODE, CLASS1, CLASS2) \
518 ((((CLASS1) == FP_REGS) != ((CLASS2) == FP_REGS)) ? 4 : 2)
520 #define IRA_COVER_CLASSES \
522 ALL_REGS, LIM_REG_CLASSES \
525 /* Stack layout; function entry, exit and calling. */
527 #define STACK_GROWS_DOWNWARD 1
528 #define FRAME_GROWS_DOWNWARD 1
529 #define STARTING_FRAME_OFFSET 0
531 /* On the 680x0, sp@- in a byte insn really pushes a word.
532 On the ColdFire, sp@- in a byte insn pushes just a byte. */
533 #define PUSH_ROUNDING(BYTES) (TARGET_COLDFIRE ? BYTES : ((BYTES) + 1) & ~1)
535 #define FIRST_PARM_OFFSET(FNDECL) 8
537 /* On the 68000, the RTS insn cannot pop anything.
538 On the 68010, the RTD insn may be used to pop them if the number
539 of args is fixed, but if the number is variable then the caller
540 must pop them all. RTD can't be used for library calls now
541 because the library is compiled with the Unix compiler.
542 Use of RTD is a selectable option, since it is incompatible with
543 standard Unix calling sequences. If the option is not selected,
544 the caller must always pop the args. */
545 #define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE) \
546 ((TARGET_RTD && (!(FUNDECL) || TREE_CODE (FUNDECL) != IDENTIFIER_NODE) \
547 && (TYPE_ARG_TYPES (FUNTYPE) == 0 \
548 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
549 == void_type_node))) \
552 /* On the m68k the return value defaults to D0. */
553 #define FUNCTION_VALUE(VALTYPE, FUNC) \
554 gen_rtx_REG (TYPE_MODE (VALTYPE), D0_REG)
556 /* On the m68k the return value defaults to D0. */
557 #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, D0_REG)
559 /* On the m68k, D0 is usually the only register used. */
560 #define FUNCTION_VALUE_REGNO_P(N) ((N) == D0_REG)
562 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
563 more than one register.
564 XXX This macro is m68k specific and used only for m68kemb.h. */
565 #define NEEDS_UNTYPED_CALL 0
567 /* On the m68k, all arguments are usually pushed on the stack. */
568 #define FUNCTION_ARG_REGNO_P(N) 0
570 /* On the m68k, this is a single integer, which is a number of bytes
571 of arguments scanned so far. */
572 #define CUMULATIVE_ARGS int
574 /* On the m68k, the offset starts at 0. */
575 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
578 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
579 ((CUM) += ((MODE) != BLKmode \
580 ? (GET_MODE_SIZE (MODE) + 3) & ~3 \
581 : (int_size_in_bytes (TYPE) + 3) & ~3))
583 /* On the m68k all args are always pushed. */
584 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) 0
586 #define FUNCTION_PROFILER(FILE, LABELNO) \
587 asm_fprintf (FILE, "\tlea %LLP%d,%Ra0\n\tjsr mcount\n", (LABELNO))
589 #define EXIT_IGNORE_STACK 1
591 /* Output assembler code for a block containing the constant parts
592 of a trampoline, leaving space for the variable parts.
594 On the m68k, the trampoline looks like this:
598 WARNING: Targets that may run on 68040+ cpus must arrange for
599 the instruction cache to be flushed. Previous incarnations of
600 the m68k trampoline code attempted to get around this by either
601 using an out-of-line transfer function or pc-relative data, but
602 the fact remains that the code to jump to the transfer function
603 or the code to load the pc-relative data needs to be flushed
604 just as much as the "variable" portion of the trampoline.
605 Recognizing that a cache flush is going to be required anyway,
606 dispense with such notions and build a smaller trampoline.
608 Since more instructions are required to move a template into
609 place than to create it on the spot, don't use a template. */
611 #define TRAMPOLINE_SIZE 12
612 #define TRAMPOLINE_ALIGNMENT 16
614 /* Targets redefine this to invoke code to either flush the cache,
615 or enable stack execution (or both). */
616 #ifndef FINALIZE_TRAMPOLINE
617 #define FINALIZE_TRAMPOLINE(TRAMP)
620 /* We generate a two-instructions program at address TRAMP :
623 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
625 emit_move_insn (gen_rtx_MEM (HImode, TRAMP), \
626 GEN_INT(0x207C + ((STATIC_CHAIN_REGNUM-8) << 9))); \
627 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 2)), CXT); \
628 emit_move_insn (gen_rtx_MEM (HImode, plus_constant (TRAMP, 6)), \
630 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 8)), FNADDR); \
631 FINALIZE_TRAMPOLINE(TRAMP); \
634 /* This is the library routine that is used to transfer control from the
635 trampoline to the actual nested function. It is defined for backward
636 compatibility, for linking with object code that used the old trampoline
639 A colon is used with no explicit operands to cause the template string
640 to be scanned for %-constructs.
642 The function name __transfer_from_trampoline is not actually used.
643 The function definition just permits use of "asm with operands"
644 (though the operand list is empty). */
645 #define TRANSFER_FROM_TRAMPOLINE \
647 __transfer_from_trampoline () \
649 register char *a0 asm (M68K_STATIC_CHAIN_REG_NAME); \
650 asm (GLOBAL_ASM_OP "___trampoline"); \
651 asm ("___trampoline:"); \
652 asm volatile ("move%.l %0,%@" : : "m" (a0[22])); \
653 asm volatile ("move%.l %1,%0" : "=a" (a0) : "m" (a0[18])); \
657 /* There are two registers that can always be eliminated on the m68k.
658 The frame pointer and the arg pointer can be replaced by either the
659 hard frame pointer or to the stack pointer, depending upon the
660 circumstances. The hard frame pointer is not used before reload and
661 so it is not eligible for elimination. */
662 #define ELIMINABLE_REGS \
663 {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM }, \
664 { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM }, \
665 { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM }}
667 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
668 (OFFSET) = m68k_initial_elimination_offset(FROM, TO)
670 /* Addressing modes, and classification of registers for them. */
672 #define HAVE_POST_INCREMENT 1
673 #define HAVE_PRE_DECREMENT 1
675 /* Macros to check register numbers against specific register classes. */
677 /* True for data registers, D0 through D7. */
678 #define DATA_REGNO_P(REGNO) IN_RANGE (REGNO, 0, 7)
680 /* True for address registers, A0 through A7. */
681 #define ADDRESS_REGNO_P(REGNO) IN_RANGE (REGNO, 8, 15)
683 /* True for integer registers, D0 through D7 and A0 through A7. */
684 #define INT_REGNO_P(REGNO) IN_RANGE (REGNO, 0, 15)
686 /* True for floating point registers, FP0 through FP7. */
687 #define FP_REGNO_P(REGNO) IN_RANGE (REGNO, 16, 23)
689 #define REGNO_OK_FOR_INDEX_P(REGNO) \
690 (INT_REGNO_P (REGNO) \
691 || INT_REGNO_P (reg_renumber[REGNO]))
693 #define REGNO_OK_FOR_BASE_P(REGNO) \
694 (ADDRESS_REGNO_P (REGNO) \
695 || ADDRESS_REGNO_P (reg_renumber[REGNO]))
697 #define REGNO_OK_FOR_INDEX_NONSTRICT_P(REGNO) \
698 (INT_REGNO_P (REGNO) \
699 || REGNO == ARG_POINTER_REGNUM \
700 || REGNO >= FIRST_PSEUDO_REGISTER)
702 #define REGNO_OK_FOR_BASE_NONSTRICT_P(REGNO) \
703 (ADDRESS_REGNO_P (REGNO) \
704 || REGNO == ARG_POINTER_REGNUM \
705 || REGNO >= FIRST_PSEUDO_REGISTER)
707 /* Now macros that check whether X is a register and also,
708 strictly, whether it is in a specified class.
710 These macros are specific to the m68k, and may be used only
711 in code for printing assembler insns and in conditions for
712 define_optimization. */
714 /* 1 if X is a data register. */
715 #define DATA_REG_P(X) (REG_P (X) && DATA_REGNO_P (REGNO (X)))
717 /* 1 if X is an fp register. */
718 #define FP_REG_P(X) (REG_P (X) && FP_REGNO_P (REGNO (X)))
720 /* 1 if X is an address register */
721 #define ADDRESS_REG_P(X) (REG_P (X) && ADDRESS_REGNO_P (REGNO (X)))
723 /* True if SYMBOL + OFFSET constants must refer to something within
725 #ifndef M68K_OFFSETS_MUST_BE_WITHIN_SECTIONS_P
726 #define M68K_OFFSETS_MUST_BE_WITHIN_SECTIONS_P 0
729 #define MAX_REGS_PER_ADDRESS 2
731 #define CONSTANT_ADDRESS_P(X) \
732 ((GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
733 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST \
734 || GET_CODE (X) == HIGH) \
735 && LEGITIMATE_CONSTANT_P (X))
737 /* Nonzero if the constant value X is a legitimate general operand.
738 It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE. */
739 #define LEGITIMATE_CONSTANT_P(X) \
740 (GET_MODE (X) != XFmode \
741 && !m68k_illegitimate_symbolic_constant_p (X))
743 #ifndef REG_OK_STRICT
744 #define REG_STRICT_P 0
746 #define REG_STRICT_P 1
749 #define LEGITIMATE_PIC_OPERAND_P(X) \
750 (!symbolic_operand (X, VOIDmode) \
751 || (TARGET_PCREL && REG_STRICT_P) \
752 || m68k_tls_reference_p (X, true))
754 #define REG_OK_FOR_BASE_P(X) \
755 m68k_legitimate_base_reg_p (X, REG_STRICT_P)
757 #define REG_OK_FOR_INDEX_P(X) \
758 m68k_legitimate_index_reg_p (X, REG_STRICT_P)
761 /* This address is OK as it stands. */
762 #define PIC_CASE_VECTOR_ADDRESS(index) index
763 #define CASE_VECTOR_MODE HImode
764 #define CASE_VECTOR_PC_RELATIVE 1
766 #define DEFAULT_SIGNED_CHAR 1
768 #define SLOW_BYTE_ACCESS 0
770 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
772 /* The ColdFire FF1 instruction returns 32 for zero. */
773 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
775 #define STORE_FLAG_VALUE (-1)
778 #define FUNCTION_MODE QImode
781 /* Tell final.c how to eliminate redundant test instructions. */
783 /* Here we define machine-dependent flags and fields in cc_status
784 (see `conditions.h'). */
786 /* Set if the cc value is actually in the 68881, so a floating point
787 conditional branch must be output. */
788 #define CC_IN_68881 04000
790 /* On the 68000, all the insns to store in an address register fail to
791 set the cc's. However, in some cases these instructions can make it
792 possibly invalid to use the saved cc's. In those cases we clear out
793 some or all of the saved cc's so they won't be used. */
794 #define NOTICE_UPDATE_CC(EXP,INSN) notice_update_cc (EXP, INSN)
796 /* The shift instructions always clear the overflow bit. */
797 #define CC_OVERFLOW_UNUSABLE 01000
799 /* The shift instructions use the carry bit in a way not compatible with
800 conditional branches. conditions.h uses CC_NO_OVERFLOW for this purpose.
801 Rename it to something more understandable. */
802 #define CC_NO_CARRY CC_NO_OVERFLOW
804 #define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV) \
805 do { if (cc_prev_status.flags & CC_IN_68881) \
807 if (cc_prev_status.flags & CC_NO_OVERFLOW) \
809 return NORMAL; } while (0)
811 /* Control the assembler format that we output. */
813 #define ASM_APP_ON "#APP\n"
814 #define ASM_APP_OFF "#NO_APP\n"
815 #define TEXT_SECTION_ASM_OP "\t.text"
816 #define DATA_SECTION_ASM_OP "\t.data"
817 #define GLOBAL_ASM_OP "\t.globl\t"
818 #define REGISTER_PREFIX ""
819 #define LOCAL_LABEL_PREFIX ""
820 #define USER_LABEL_PREFIX "_"
821 #define IMMEDIATE_PREFIX "#"
823 #define REGISTER_NAMES \
824 {REGISTER_PREFIX"d0", REGISTER_PREFIX"d1", REGISTER_PREFIX"d2", \
825 REGISTER_PREFIX"d3", REGISTER_PREFIX"d4", REGISTER_PREFIX"d5", \
826 REGISTER_PREFIX"d6", REGISTER_PREFIX"d7", \
827 REGISTER_PREFIX"a0", REGISTER_PREFIX"a1", REGISTER_PREFIX"a2", \
828 REGISTER_PREFIX"a3", REGISTER_PREFIX"a4", REGISTER_PREFIX"a5", \
829 REGISTER_PREFIX"a6", REGISTER_PREFIX"sp", \
830 REGISTER_PREFIX"fp0", REGISTER_PREFIX"fp1", REGISTER_PREFIX"fp2", \
831 REGISTER_PREFIX"fp3", REGISTER_PREFIX"fp4", REGISTER_PREFIX"fp5", \
832 REGISTER_PREFIX"fp6", REGISTER_PREFIX"fp7", REGISTER_PREFIX"argptr" }
834 #define M68K_FP_REG_NAME REGISTER_PREFIX"fp"
836 /* Return a register name by index, handling %fp nicely.
837 We don't replace %fp for targets that don't map it to %a6
838 since it may confuse GAS. */
839 #define M68K_REGNAME(r) ( \
840 ((FRAME_POINTER_REGNUM == A6_REG) \
841 && ((r) == FRAME_POINTER_REGNUM) \
842 && frame_pointer_needed) ? \
843 M68K_FP_REG_NAME : reg_names[(r)])
845 /* On the Sun-3, the floating point registers have numbers
846 18 to 25, not 16 to 23 as they do in the compiler. */
847 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
849 /* Before the prologue, RA is at 0(%sp). */
850 #define INCOMING_RETURN_ADDR_RTX \
851 gen_rtx_MEM (VOIDmode, gen_rtx_REG (VOIDmode, STACK_POINTER_REGNUM))
853 /* After the prologue, RA is at 4(AP) in the current frame. */
854 #define RETURN_ADDR_RTX(COUNT, FRAME) \
856 ? gen_rtx_MEM (Pmode, plus_constant (arg_pointer_rtx, UNITS_PER_WORD)) \
857 : gen_rtx_MEM (Pmode, plus_constant (FRAME, UNITS_PER_WORD)))
859 /* We must not use the DBX register numbers for the DWARF 2 CFA column
860 numbers because that maps to numbers beyond FIRST_PSEUDO_REGISTER.
861 Instead use the identity mapping. */
862 #define DWARF_FRAME_REGNUM(REG) \
863 (INT_REGNO_P (REG) || FP_REGNO_P (REG) ? (REG) : INVALID_REGNUM)
865 /* The return column was originally 24, but gcc used 25 for a while too.
866 Define both registers 24 and 25 as Pmode ones and use 24 in our own
867 unwind information. */
868 #define DWARF_FRAME_REGISTERS 25
869 #define DWARF_FRAME_RETURN_COLUMN 24
870 #define DWARF_ALT_FRAME_RETURN_COLUMN 25
872 /* Before the prologue, the top of the frame is at 4(%sp). */
873 #define INCOMING_FRAME_SP_OFFSET 4
875 /* All registers are live on exit from an interrupt routine. */
876 #define EPILOGUE_USES(REGNO) \
878 && (m68k_get_function_kind (current_function_decl) \
879 == m68k_fk_interrupt_handler))
881 /* Describe how we implement __builtin_eh_return. */
882 #define EH_RETURN_DATA_REGNO(N) \
883 ((N) < 2 ? (N) : INVALID_REGNUM)
884 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, A0_REG)
885 #define EH_RETURN_HANDLER_RTX \
886 gen_rtx_MEM (Pmode, \
887 gen_rtx_PLUS (Pmode, arg_pointer_rtx, \
888 plus_constant (EH_RETURN_STACKADJ_RTX, \
891 /* Select a format to encode pointers in exception handling data. CODE
892 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
893 true if the symbol may be affected by dynamic relocations.
895 TARGET_ID_SHARED_LIBRARY and TARGET_SEP_DATA are designed to support
896 a read-only text segment without imposing a fixed gap between the
897 text and data segments. As a result, the text segment cannot refer
898 to anything in the data segment, even in PC-relative form. Because
899 .eh_frame refers to both code and data, it follows that .eh_frame
900 must be in the data segment itself, and that the offset between
901 .eh_frame and code will not be a link-time constant.
903 In theory, we could create a read-only .eh_frame by using DW_EH_PE_pcrel
904 | DW_EH_PE_indirect for all code references. However, gcc currently
905 handles indirect references using a per-TU constant pool. This means
906 that if a function and its eh_frame are removed by the linker, the
907 eh_frame's indirect references to the removed function will not be
908 removed, leading to an unresolved symbol error.
910 It isn't clear that any -msep-data or -mid-shared-library target
911 would benefit from a read-only .eh_frame anyway. In particular,
912 no known target that supports these options has a feature like
913 PT_GNU_RELRO. Without any such feature to motivate them, indirect
914 references would be unnecessary bloat, so we simply use an absolute
915 pointer for code and global references. We still use pc-relative
916 references to data, as this avoids a relocation. */
917 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
919 && !((TARGET_ID_SHARED_LIBRARY || TARGET_SEP_DATA) \
920 && ((GLOBAL) || (CODE))) \
921 ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4 \
924 #define ASM_OUTPUT_LABELREF(FILE,NAME) \
925 asm_fprintf (FILE, "%U%s", NAME)
927 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
928 sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long)(NUM))
930 #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \
931 asm_fprintf (FILE, (MOTOROLA \
932 ? "\tmove.l %s,-(%Rsp)\n" \
933 : "\tmovel %s,%Rsp@-\n"), \
936 #define ASM_OUTPUT_REG_POP(FILE,REGNO) \
937 asm_fprintf (FILE, (MOTOROLA \
938 ? "\tmove.l (%Rsp)+,%s\n" \
939 : "\tmovel %Rsp@+,%s\n"), \
942 /* The m68k does not use absolute case-vectors, but we must define this macro
944 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
945 asm_fprintf (FILE, "\t.long %LL%d\n", VALUE)
947 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
948 asm_fprintf (FILE, "\t.word %LL%d-%LL%d\n", VALUE, REL)
950 /* We don't have a way to align to more than a two-byte boundary, so do the
951 best we can and don't complain. */
952 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
954 fprintf (FILE, "\t.even\n");
956 #ifdef HAVE_GAS_BALIGN_AND_P2ALIGN
957 /* Use "move.l %a4,%a4" to advance within code. */
958 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
960 fprintf ((FILE), "\t.balignw %u,0x284c\n", 1 << (LOG));
963 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
964 fprintf (FILE, "\t.skip %u\n", (int)(SIZE))
966 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
967 ( fputs (".comm ", (FILE)), \
968 assemble_name ((FILE), (NAME)), \
969 fprintf ((FILE), ",%u\n", (int)(ROUNDED)))
971 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
972 ( fputs (".lcomm ", (FILE)), \
973 assemble_name ((FILE), (NAME)), \
974 fprintf ((FILE), ",%u\n", (int)(ROUNDED)))
976 #define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS) \
977 m68k_final_prescan_insn (INSN, OPVEC, NOPERANDS)
979 /* On the 68000, we use several CODE characters:
980 '.' for dot needed in Motorola-style opcode names.
981 '-' for an operand pushing on the stack:
982 sp@-, -(sp) or -(%sp) depending on the style of syntax.
983 '+' for an operand pushing on the stack:
984 sp@+, (sp)+ or (%sp)+ depending on the style of syntax.
985 '@' for a reference to the top word on the stack:
986 sp@, (sp) or (%sp) depending on the style of syntax.
987 '#' for an immediate operand prefix (# in MIT and Motorola syntax
988 but & in SGS syntax).
989 '!' for the fpcr register (used in some float-to-fixed conversions).
990 '$' for the letter `s' in an op code, but only on the 68040.
991 '&' for the letter `d' in an op code, but only on the 68040.
992 '/' for register prefix needed by longlong.h.
993 '?' for m68k_library_id_string
995 'b' for byte insn (no effect, on the Sun; this is for the ISI).
996 'd' to force memory addressing to be absolute, not relative.
997 'f' for float insn (print a CONST_DOUBLE as a float rather than in hex)
998 'x' for float insn (print a CONST_DOUBLE as a float rather than in hex),
999 or print pair of registers as rx:ry. */
1001 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
1002 ((CODE) == '.' || (CODE) == '#' || (CODE) == '-' \
1003 || (CODE) == '+' || (CODE) == '@' || (CODE) == '!' \
1004 || (CODE) == '$' || (CODE) == '&' || (CODE) == '/' || (CODE) == '?')
1007 /* See m68k.c for the m68k specific codes. */
1008 #define PRINT_OPERAND(FILE, X, CODE) print_operand (FILE, X, CODE)
1010 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) print_operand_address (FILE, ADDR)
1012 #define OUTPUT_ADDR_CONST_EXTRA(FILE, X, FAIL) \
1014 if (! m68k_output_addr_const_extra (FILE, (X))) \
1018 /* Values used in the MICROARCH argument to M68K_DEVICE. */
1039 /* An enumeration of all supported target devices. */
1042 #define M68K_DEVICE(NAME,ENUM_VALUE,FAMILY,MULTILIB,MICROARCH,ISA,FLAGS) \
1044 #include "m68k-devices.def"
1056 enum m68k_function_kind
1058 m68k_fk_normal_function,
1059 m68k_fk_interrupt_handler,
1060 m68k_fk_interrupt_thread
1063 /* Variables in m68k.c; see there for details. */
1064 extern const char *m68k_library_id_string;
1065 extern enum target_device m68k_cpu;
1066 extern enum uarch_type m68k_tune;
1067 extern enum fpu_type m68k_fpu;
1068 extern unsigned int m68k_cpu_flags;
1069 extern unsigned int m68k_tune_flags;
1070 extern const char *m68k_symbolic_call;
1071 extern const char *m68k_symbolic_jump;
1073 enum M68K_SYMBOLIC_CALL { M68K_SYMBOLIC_CALL_NONE, M68K_SYMBOLIC_CALL_JSR,
1074 M68K_SYMBOLIC_CALL_BSR_C, M68K_SYMBOLIC_CALL_BSR_P };
1076 extern enum M68K_SYMBOLIC_CALL m68k_symbolic_call_var;
1078 /* ??? HOST_WIDE_INT is not being defined for auto-generated files.
1080 #ifdef HOST_WIDE_INT
1081 typedef enum { MOVL, SWAP, NEGW, NOTW, NOTB, MOVQ, MVS, MVZ }
1084 extern M68K_CONST_METHOD m68k_const_method (HOST_WIDE_INT);
1087 extern void m68k_emit_move_double (rtx [2]);
1089 extern int m68k_sched_address_bypass_p (rtx, rtx);
1090 extern int m68k_sched_indexed_address_bypass_p (rtx, rtx);
1092 #define CPU_UNITS_QUERY 1