gcc/config/avr/avr.h

   1 /* Definitions of target machine for GNU compiler,
   2    for ATMEL AVR at90s8515, ATmega103/103L, ATmega603/603L microcontrollers.
   3    Copyright (C) 1998-2017 Free Software Foundation, Inc.
   4    Contributed by Denis Chertykov (chertykov@gmail.com)
   5
   6 This file is part of GCC.
   7
   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)
  11 any later version.
  12
  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.
  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 typedef struct
  23 {
  24   /* Id of the address space as used in c_register_addr_space */
  25   unsigned char id;
  26
  27   /* Flavour of memory: 0 = RAM, 1 = Flash */
  28   int memory_class;
  29
  30   /* Width of pointer (in bytes) */
  31   int pointer_size;
  32
  33   /* Name of the address space as visible to the user */
  34   const char *name;
  35
  36   /* Segment (i.e. 64k memory chunk) number.  */
  37   int segment;
  38
  39   /* Section prefix, e.g. ".progmem1.data"  */
  40   const char *section_name;
  41 } avr_addrspace_t;
  42
  43 extern const avr_addrspace_t avr_addrspace[];
  44
  45 /* Known address spaces */
  46
  47 enum
  48   {
  49     ADDR_SPACE_RAM, /* ADDR_SPACE_GENERIC */
  50     ADDR_SPACE_FLASH,
  51     ADDR_SPACE_FLASH1,
  52     ADDR_SPACE_FLASH2,
  53     ADDR_SPACE_FLASH3,
  54     ADDR_SPACE_FLASH4,
  55     ADDR_SPACE_FLASH5,
  56     ADDR_SPACE_MEMX,
  57     /* Sentinel */
  58     ADDR_SPACE_COUNT
  59   };
  60
  61 #define TARGET_CPU_CPP_BUILTINS()       avr_cpu_cpp_builtins (pfile)
  62
  63 #define AVR_SHORT_CALLS (TARGET_SHORT_CALLS                             \
  64                          && avr_arch == &avr_arch_types[ARCH_AVRXMEGA3])
  65 #define AVR_HAVE_JMP_CALL (avr_arch->have_jmp_call && ! AVR_SHORT_CALLS)
  66 #define AVR_HAVE_MUL (avr_arch->have_mul)
  67 #define AVR_HAVE_MOVW (avr_arch->have_movw_lpmx)
  68 #define AVR_HAVE_LPM (!AVR_TINY)
  69 #define AVR_HAVE_LPMX (avr_arch->have_movw_lpmx)
  70 #define AVR_HAVE_ELPM (avr_arch->have_elpm)
  71 #define AVR_HAVE_ELPMX (avr_arch->have_elpmx)
  72 #define AVR_HAVE_RAMPD (avr_arch->have_rampd)
  73 #define AVR_HAVE_RAMPX (avr_arch->have_rampd)
  74 #define AVR_HAVE_RAMPY (avr_arch->have_rampd)
  75 #define AVR_HAVE_RAMPZ (avr_arch->have_elpm             \
  76                         || avr_arch->have_rampd)
  77 #define AVR_HAVE_EIJMP_EICALL (avr_arch->have_eijmp_eicall)
  78
  79 /* Handling of 8-bit SP versus 16-bit SP is as follows:
  80
  81 FIXME: DRIVER_SELF_SPECS has changed.
  82    -msp8 is used internally to select the right multilib for targets with
  83    8-bit SP.  -msp8 is set automatically by DRIVER_SELF_SPECS for devices
  84    with 8-bit SP or by multilib generation machinery.  If a frame pointer is
  85    needed and SP is only 8 bits wide, SP is zero-extended to get FP.
  86
  87    TARGET_TINY_STACK is triggered by -mtiny-stack which is a user option.
  88    This option has no effect on multilib selection.  It serves to save some
  89    bytes on 16-bit SP devices by only changing SP_L and leaving SP_H alone.
  90
  91    These two properties are reflected by built-in macros __AVR_SP8__ resp.
  92    __AVR_HAVE_8BIT_SP__ and __AVR_HAVE_16BIT_SP__.  During multilib generation
  93    there is always __AVR_SP8__ == __AVR_HAVE_8BIT_SP__.  */
  94
  95 #define AVR_HAVE_8BIT_SP                        \
  96   (TARGET_TINY_STACK || avr_sp8)
  97
  98 #define AVR_HAVE_SPH (!avr_sp8)
  99
 100 #define AVR_2_BYTE_PC (!AVR_HAVE_EIJMP_EICALL)
 101 #define AVR_3_BYTE_PC (AVR_HAVE_EIJMP_EICALL)
 102
 103 #define AVR_XMEGA (avr_arch->xmega_p)
 104 #define AVR_TINY  (avr_arch->tiny_p)
 105
 106 #define BITS_BIG_ENDIAN 0
 107 #define BYTES_BIG_ENDIAN 0
 108 #define WORDS_BIG_ENDIAN 0
 109
 110 #ifdef IN_LIBGCC2
 111 /* This is to get correct SI and DI modes in libgcc2.c (32 and 64 bits).  */
 112 #define UNITS_PER_WORD 4
 113 #else
 114 /* Width of a word, in units (bytes).  */
 115 #define UNITS_PER_WORD 1
 116 #endif
 117
 118 #define POINTER_SIZE 16
 119
 120
 121 /* Maximum sized of reasonable data type
 122    DImode or Dfmode ...  */
 123 #define MAX_FIXED_MODE_SIZE 32
 124
 125 #define PARM_BOUNDARY 8
 126
 127 #define FUNCTION_BOUNDARY 8
 128
 129 #define EMPTY_FIELD_BOUNDARY 8
 130
 131 /* No data type wants to be aligned rounder than this.  */
 132 #define BIGGEST_ALIGNMENT 8
 133
 134 #define TARGET_VTABLE_ENTRY_ALIGN 8
 135
 136 #define STRICT_ALIGNMENT 0
 137
 138 #define INT_TYPE_SIZE (TARGET_INT8 ? 8 : 16)
 139 #define SHORT_TYPE_SIZE (INT_TYPE_SIZE == 8 ? INT_TYPE_SIZE : 16)
 140 #define LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 16 : 32)
 141 #define LONG_LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 32 : 64)
 142 #define FLOAT_TYPE_SIZE 32
 143 #define DOUBLE_TYPE_SIZE 32
 144 #define LONG_DOUBLE_TYPE_SIZE 32
 145 #define LONG_LONG_ACCUM_TYPE_SIZE 64
 146
 147 #define DEFAULT_SIGNED_CHAR 1
 148
 149 #define SIZE_TYPE (INT_TYPE_SIZE == 8 ? "long unsigned int" : "unsigned int")
 150 #define PTRDIFF_TYPE (INT_TYPE_SIZE == 8 ? "long int" :"int")
 151
 152 #define WCHAR_TYPE_SIZE 16
 153
 154 #define FIRST_PSEUDO_REGISTER 36
 155
 156 #define FIXED_REGISTERS {\
 157   1,1,/* r0 r1 */\
 158   0,0,/* r2 r3 */\
 159   0,0,/* r4 r5 */\
 160   0,0,/* r6 r7 */\
 161   0,0,/* r8 r9 */\
 162   0,0,/* r10 r11 */\
 163   0,0,/* r12 r13 */\
 164   0,0,/* r14 r15 */\
 165   0,0,/* r16 r17 */\
 166   0,0,/* r18 r19 */\
 167   0,0,/* r20 r21 */\
 168   0,0,/* r22 r23 */\
 169   0,0,/* r24 r25 */\
 170   0,0,/* r26 r27 */\
 171   0,0,/* r28 r29 */\
 172   0,0,/* r30 r31 */\
 173   1,1,/*  STACK */\
 174   1,1 /* arg pointer */  }
 175
 176 #define CALL_USED_REGISTERS {                   \
 177   1,1,/* r0 r1 */                               \
 178     0,0,/* r2 r3 */                             \
 179     0,0,/* r4 r5 */                             \
 180     0,0,/* r6 r7 */                             \
 181     0,0,/* r8 r9 */                             \
 182     0,0,/* r10 r11 */                           \
 183     0,0,/* r12 r13 */                           \
 184     0,0,/* r14 r15 */                           \
 185     0,0,/* r16 r17 */                           \
 186     1,1,/* r18 r19 */                           \
 187     1,1,/* r20 r21 */                           \
 188     1,1,/* r22 r23 */                           \
 189     1,1,/* r24 r25 */                           \
 190     1,1,/* r26 r27 */                           \
 191     0,0,/* r28 r29 */                           \
 192     1,1,/* r30 r31 */                           \
 193     1,1,/*  STACK */                            \
 194     1,1 /* arg pointer */  }
 195
 196 #define REG_ALLOC_ORDER {                       \
 197     24,25,                                      \
 198     18,19,                                      \
 199     20,21,                                      \
 200     22,23,                                      \
 201     30,31,                                      \
 202     26,27,                                      \
 203     28,29,                                      \
 204     17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,    \
 205     0,1,                                        \
 206     32,33,34,35                                 \
 207     }
 208
 209 #define ADJUST_REG_ALLOC_ORDER avr_adjust_reg_alloc_order()
 210
 211
 212 enum reg_class {
 213   NO_REGS,
 214   R0_REG,                       /* r0 */
 215   POINTER_X_REGS,               /* r26 - r27 */
 216   POINTER_Y_REGS,               /* r28 - r29 */
 217   POINTER_Z_REGS,               /* r30 - r31 */
 218   STACK_REG,                    /* STACK */
 219   BASE_POINTER_REGS,            /* r28 - r31 */
 220   POINTER_REGS,                 /* r26 - r31 */
 221   ADDW_REGS,                    /* r24 - r31 */
 222   SIMPLE_LD_REGS,               /* r16 - r23 */
 223   LD_REGS,                      /* r16 - r31 */
 224   NO_LD_REGS,                   /* r0 - r15 */
 225   GENERAL_REGS,                 /* r0 - r31 */
 226   ALL_REGS, LIM_REG_CLASSES
 227 };
 228
 229
 230 #define N_REG_CLASSES (int)LIM_REG_CLASSES
 231
 232 #define REG_CLASS_NAMES {                                       \
 233                  "NO_REGS",                                     \
 234                    "R0_REG",    /* r0 */                        \
 235                    "POINTER_X_REGS", /* r26 - r27 */            \
 236                    "POINTER_Y_REGS", /* r28 - r29 */            \
 237                    "POINTER_Z_REGS", /* r30 - r31 */            \
 238                    "STACK_REG", /* STACK */                     \
 239                    "BASE_POINTER_REGS", /* r28 - r31 */         \
 240                    "POINTER_REGS", /* r26 - r31 */              \
 241                    "ADDW_REGS", /* r24 - r31 */                 \
 242                    "SIMPLE_LD_REGS", /* r16 - r23 */            \
 243                    "LD_REGS",   /* r16 - r31 */                 \
 244                    "NO_LD_REGS", /* r0 - r15 */                 \
 245                    "GENERAL_REGS", /* r0 - r31 */               \
 246                    "ALL_REGS" }
 247
 248 #define REG_CLASS_CONTENTS {                                            \
 249   {0x00000000,0x00000000},      /* NO_REGS */                           \
 250   {0x00000001,0x00000000},      /* R0_REG */                            \
 251   {3u << REG_X,0x00000000},     /* POINTER_X_REGS, r26 - r27 */         \
 252   {3u << REG_Y,0x00000000},     /* POINTER_Y_REGS, r28 - r29 */         \
 253   {3u << REG_Z,0x00000000},     /* POINTER_Z_REGS, r30 - r31 */         \
 254   {0x00000000,0x00000003},      /* STACK_REG, STACK */                  \
 255   {(3u << REG_Y) | (3u << REG_Z),                                       \
 256      0x00000000},               /* BASE_POINTER_REGS, r28 - r31 */      \
 257   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z),                       \
 258      0x00000000},               /* POINTER_REGS, r26 - r31 */           \
 259   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z) | (3u << REG_W),       \
 260      0x00000000},               /* ADDW_REGS, r24 - r31 */              \
 261   {0x00ff0000,0x00000000},      /* SIMPLE_LD_REGS r16 - r23 */          \
 262   {(3u << REG_X)|(3u << REG_Y)|(3u << REG_Z)|(3u << REG_W)|(0xffu << 16),\
 263      0x00000000},       /* LD_REGS, r16 - r31 */                        \
 264   {0x0000ffff,0x00000000},      /* NO_LD_REGS  r0 - r15 */              \
 265   {0xffffffff,0x00000000},      /* GENERAL_REGS, r0 - r31 */            \
 266   {0xffffffff,0x00000003}       /* ALL_REGS */                          \
 267 }
 268
 269 #define REGNO_REG_CLASS(R) avr_regno_reg_class(R)
 270
 271 #define MODE_CODE_BASE_REG_CLASS(mode, as, outer_code, index_code)   \
 272   avr_mode_code_base_reg_class (mode, as, outer_code, index_code)
 273
 274 #define INDEX_REG_CLASS NO_REGS
 275
 276 #define REGNO_MODE_CODE_OK_FOR_BASE_P(num, mode, as, outer_code, index_code) \
 277   avr_regno_mode_code_ok_for_base_p (num, mode, as, outer_code, index_code)
 278
 279 #define REGNO_OK_FOR_INDEX_P(NUM) 0
 280
 281 #define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true
 282
 283 #define STACK_PUSH_CODE POST_DEC
 284
 285 #define STACK_GROWS_DOWNWARD 1
 286
 287 #define STARTING_FRAME_OFFSET avr_starting_frame_offset()
 288
 289 #define STACK_POINTER_OFFSET 1
 290
 291 #define FIRST_PARM_OFFSET(FUNDECL) 0
 292
 293 #define STACK_BOUNDARY 8
 294
 295 #define STACK_POINTER_REGNUM 32
 296
 297 #define FRAME_POINTER_REGNUM REG_Y
 298
 299 #define ARG_POINTER_REGNUM 34
 300
 301 #define STATIC_CHAIN_REGNUM ((AVR_TINY) ? 18 :2)
 302
 303 #define ELIMINABLE_REGS {                                       \
 304     { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM },               \
 305     { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM },               \
 306     { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },             \
 307     { FRAME_POINTER_REGNUM + 1, STACK_POINTER_REGNUM + 1 } }
 308
 309 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 310   OFFSET = avr_initial_elimination_offset (FROM, TO)
 311
 312 #define RETURN_ADDR_RTX(count, tem) avr_return_addr_rtx (count, tem)
 313
 314 /* Don't use Push rounding. expr.c: emit_single_push_insn is broken
 315    for POST_DEC targets (PR27386).  */
 316 /*#define PUSH_ROUNDING(NPUSHED) (NPUSHED)*/
 317
 318 typedef struct avr_args
 319 {
 320   /* # Registers available for passing */
 321   int nregs;
 322
 323   /* Next available register number */
 324   int regno;
 325 } CUMULATIVE_ARGS;
 326
 327 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 328   avr_init_cumulative_args (&(CUM), FNTYPE, LIBNAME, FNDECL)
 329
 330 #define FUNCTION_ARG_REGNO_P(r) avr_function_arg_regno_p(r)
 331
 332 #define DEFAULT_PCC_STRUCT_RETURN 0
 333
 334 #define EPILOGUE_USES(REGNO) avr_epilogue_uses(REGNO)
 335
 336 #define HAVE_POST_INCREMENT 1
 337 #define HAVE_PRE_DECREMENT 1
 338
 339 #define MAX_REGS_PER_ADDRESS 1
 340
 341 #define LEGITIMIZE_RELOAD_ADDRESS(X,MODE,OPNUM,TYPE,IND_L,WIN)          \
 342   do {                                                                  \
 343     rtx new_x = avr_legitimize_reload_address (&(X), MODE, OPNUM, TYPE, \
 344                                                ADDR_TYPE (TYPE),        \
 345                                                IND_L, make_memloc);     \
 346     if (new_x)                                                          \
 347       {                                                                 \
 348         X = new_x;                                                      \
 349         goto WIN;                                                       \
 350       }                                                                 \
 351   } while (0)
 352
 353 /* We increase branch costs after reload in order to keep basic-block
 354    reordering from introducing out-of-line jumps and to prefer fall-through
 355    edges instead.  The default branch costs are 0, mainly because otherwise
 356    do_store_flag might come up with bloated code.  */
 357 #define BRANCH_COST(speed_p, predictable_p)     \
 358   (avr_branch_cost + (reload_completed ? 4 : 0))
 359
 360 #define SLOW_BYTE_ACCESS 0
 361
 362 #define NO_FUNCTION_CSE 1
 363
 364 #define REGISTER_TARGET_PRAGMAS()                                       \
 365   do {                                                                  \
 366     avr_register_target_pragmas();                                      \
 367   } while (0)
 368
 369 #define TEXT_SECTION_ASM_OP "\t.text"
 370
 371 #define DATA_SECTION_ASM_OP "\t.data"
 372
 373 #define BSS_SECTION_ASM_OP "\t.section .bss"
 374
 375 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
 376    There are no shared libraries on this target, and these sections are
 377    placed in the read-only program memory, so they are not writable.  */
 378
 379 #undef CTORS_SECTION_ASM_OP
 380 #define CTORS_SECTION_ASM_OP "\t.section .ctors,\"a\",@progbits"
 381
 382 #undef DTORS_SECTION_ASM_OP
 383 #define DTORS_SECTION_ASM_OP "\t.section .dtors,\"a\",@progbits"
 384
 385 #define TARGET_ASM_CONSTRUCTOR avr_asm_out_ctor
 386
 387 #define TARGET_ASM_DESTRUCTOR avr_asm_out_dtor
 388
 389 #define SUPPORTS_INIT_PRIORITY 0
 390
 391 /* We pretend jump tables are in text section because otherwise,
 392    final.c will switch to .rodata before jump tables and thereby
 393    triggers __do_copy_data.  As we implement ASM_OUTPUT_ADDR_VEC,
 394    we still have full control over the jump tables themselves.  */
 395 #define JUMP_TABLES_IN_TEXT_SECTION 1
 396
 397 #define ASM_COMMENT_START " ; "
 398
 399 #define ASM_APP_ON "/* #APP */\n"
 400
 401 #define ASM_APP_OFF "/* #NOAPP */\n"
 402
 403 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) ((C) == '\n' || ((C) == '$'))
 404
 405 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(STREAM, DECL, NAME, SIZE, ALIGN) \
 406   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, false)
 407
 408 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 409   avr_asm_asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN, \
 410                                   asm_output_aligned_bss)
 411
 412 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(STREAM, DECL, NAME, SIZE, ALIGN)  \
 413   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, true)
 414
 415 /* Globalizing directive for a label.  */
 416 #define GLOBAL_ASM_OP ".global\t"
 417
 418 #define SUPPORTS_WEAK 1
 419
 420 #define HAS_INIT_SECTION 1
 421
 422 #define REGISTER_NAMES {                                \
 423   "r0","r1","r2","r3","r4","r5","r6","r7",              \
 424     "r8","r9","r10","r11","r12","r13","r14","r15",      \
 425     "r16","r17","r18","r19","r20","r21","r22","r23",    \
 426     "r24","r25","r26","r27","r28","r29","r30","r31",    \
 427     "__SP_L__","__SP_H__","argL","argH"}
 428
 429 #define FINAL_PRESCAN_INSN(insn, operand, nop)  \
 430   avr_final_prescan_insn (insn, operand,nop)
 431
 432 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO)      \
 433 {                                               \
 434   gcc_assert (REGNO < 32);                      \
 435   fprintf (STREAM, "\tpush\tr%d", REGNO);       \
 436 }
 437
 438 #define ASM_OUTPUT_REG_POP(STREAM, REGNO)       \
 439 {                                               \
 440   gcc_assert (REGNO < 32);                      \
 441   fprintf (STREAM, "\tpop\tr%d", REGNO);        \
 442 }
 443
 444 #define ASM_OUTPUT_ADDR_VEC(TLABEL, TDATA)      \
 445   avr_output_addr_vec (TLABEL, TDATA)
 446
 447 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 448   do {                                                  \
 449     if ((POWER) > 0)                                    \
 450       fprintf (STREAM, "\t.p2align\t%d\n", POWER);      \
 451   } while (0)
 452
 453 #define CASE_VECTOR_MODE HImode
 454
 455 #undef WORD_REGISTER_OPERATIONS
 456
 457 /* Can move only a single byte from memory to reg in a
 458    single instruction. */
 459
 460 #define MOVE_MAX 1
 461
 462 /* Allow upto two bytes moves to occur using by_pieces
 463    infrastructure */
 464
 465 #define MOVE_MAX_PIECES 2
 466
 467 /* Set MOVE_RATIO to 3 to allow memory moves upto 4 bytes to happen
 468    by pieces when optimizing for speed, like it did when MOVE_MAX_PIECES
 469    was 4. When optimizing for size, allow memory moves upto 2 bytes.
 470    Also see avr_use_by_pieces_infrastructure_p. */
 471
 472 #define MOVE_RATIO(speed) ((speed) ? 3 : 2)
 473
 474 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 475
 476 #define Pmode HImode
 477
 478 #define FUNCTION_MODE HImode
 479
 480 #define DOLLARS_IN_IDENTIFIERS 0
 481
 482 #define TRAMPOLINE_SIZE 4
 483
 484 /* Store in cc_status the expressions
 485    that the condition codes will describe
 486    after execution of an instruction whose pattern is EXP.
 487    Do not alter them if the instruction would not alter the cc's.  */
 488
 489 #define NOTICE_UPDATE_CC(EXP, INSN) avr_notice_update_cc (EXP, INSN)
 490
 491 /* The add insns don't set overflow in a usable way.  */
 492 #define CC_OVERFLOW_UNUSABLE 01000
 493 /* The mov,and,or,xor insns don't set carry.  That's ok though as the
 494    Z bit is all we need when doing unsigned comparisons on the result of
 495    these insns (since they're always with 0).  However, conditions.h has
 496    CC_NO_OVERFLOW defined for this purpose.  Rename it to something more
 497    understandable.  */
 498 #define CC_NO_CARRY CC_NO_OVERFLOW
 499
 500
 501 /* Output assembler code to FILE to increment profiler label # LABELNO
 502    for profiling a function entry.  */
 503
 504 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 505   fprintf (FILE, "/* profiler %d */", (LABELNO))
 506
 507 #define ADJUST_INSN_LENGTH(INSN, LENGTH)                \
 508     (LENGTH = avr_adjust_insn_length (INSN, LENGTH))
 509
 510 extern const char *avr_devicespecs_file (int, const char**);
 511
 512 #define EXTRA_SPEC_FUNCTIONS                                   \
 513   { "device-specs-file", avr_devicespecs_file },
 514
 515 /* Driver self specs has lmited functionality w.r.t. '%s' for dynamic specs.
 516    Apply '%s' to a static string to inflate the file (directory) name which
 517    is used to diagnose problems with reading the specs file.  */
 518
 519 #undef  DRIVER_SELF_SPECS
 520 #define DRIVER_SELF_SPECS                       \
 521   " %:device-specs-file(device-specs%s %{mmcu=*:%*})"
 522
 523 /* No libstdc++ for now.  Empty string doesn't work.  */
 524 #define LIBSTDCXX "gcc"
 525
 526 /* This is the default without any -mmcu=* option.  */
 527 #define MULTILIB_DEFAULTS { "mmcu=" AVR_MMCU_DEFAULT }
 528
 529 #define TEST_HARD_REG_CLASS(CLASS, REGNO) \
 530   TEST_HARD_REG_BIT (reg_class_contents[ (int) (CLASS)], REGNO)
 531
 532 #define CR_TAB "\n\t"
 533
 534 #define DWARF2_ADDR_SIZE 4
 535
 536 #define INCOMING_RETURN_ADDR_RTX   avr_incoming_return_addr_rtx ()
 537 #define INCOMING_FRAME_SP_OFFSET   (AVR_3_BYTE_PC ? 3 : 2)
 538
 539 /* The caller's stack pointer value immediately before the call
 540    is one byte below the first argument.  */
 541 #define ARG_POINTER_CFA_OFFSET(FNDECL)  -1
 542
 543 #define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
 544   avr_hard_regno_rename_ok (OLD_REG, NEW_REG)
 545
 546 /* A C structure for machine-specific, per-function data.
 547    This is added to the cfun structure.  */
 548 struct GTY(()) machine_function
 549 {
 550   /* 'true' - if current function is a naked function.  */
 551   int is_naked;
 552
 553   /* 'true' - if current function is an interrupt function
 554      as specified by the "interrupt" attribute.  */
 555   int is_interrupt;
 556
 557   /* 'true' - if current function is a signal function
 558      as specified by the "signal" attribute.  */
 559   int is_signal;
 560
 561   /* 'true' - if current function is a 'task' function
 562      as specified by the "OS_task" attribute.  */
 563   int is_OS_task;
 564
 565   /* 'true' - if current function is a 'main' function
 566      as specified by the "OS_main" attribute.  */
 567   int is_OS_main;
 568
 569   /* Current function stack size.  */
 570   int stack_usage;
 571
 572   /* 'true' if a callee might be tail called */
 573   int sibcall_fails;
 574
 575   /* 'true' if the above is_foo predicates are sanity-checked to avoid
 576      multiple diagnose for the same function.  */
 577   int attributes_checked_p;
 578
 579   /* 'true' - if current function shall not use '__gcc_isr' pseudo
 580      instructions as specified by the "no_gccisr" attribute.  */
 581   int is_no_gccisr;
 582
 583   /* Used for `__gcc_isr' pseudo instruction handling of
 584      non-naked ISR prologue / epilogue(s).  */
 585   struct
 586   {
 587     /* 'true' if this function actually uses "*gasisr" insns. */
 588     int yes;
 589     /* 'true' if this function is allowed to use "*gasisr" insns. */
 590     int maybe;
 591     /* The register numer as printed by the Done chunk.  */
 592     int regno;
 593   } gasisr;
 594
 595   /* 'true' if this function references .L__stack_usage like with
 596      __builtin_return_address.  */
 597   int use_L__stack_usage;
 598 };
 599
 600 /* AVR does not round pushes, but the existence of this macro is
 601    required in order for pushes to be generated.  */
 602 #define PUSH_ROUNDING(X)        (X)
 603
 604 /* Define prototype here to avoid build warning.  Some files using
 605    ACCUMULATE_OUTGOING_ARGS (directly or indirectly) include
 606    tm.h but not tm_p.h.  */
 607 extern int avr_accumulate_outgoing_args (void);
 608 #define ACCUMULATE_OUTGOING_ARGS avr_accumulate_outgoing_args()
 609
 610 #define INIT_EXPANDERS avr_init_expanders()
 611
 612 /* Flags used for io and address attributes.  */
 613 #define SYMBOL_FLAG_IO_LOW      (SYMBOL_FLAG_MACH_DEP << 4)
 614 #define SYMBOL_FLAG_IO          (SYMBOL_FLAG_MACH_DEP << 5)
 615 #define SYMBOL_FLAG_ADDRESS     (SYMBOL_FLAG_MACH_DEP << 6)