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) 1998-2015 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_HAVE_JMP_CALL (avr_arch->have_jmp_call)
  64 #define AVR_HAVE_MUL (avr_arch->have_mul)
  65 #define AVR_HAVE_MOVW (avr_arch->have_movw_lpmx)
  66 #define AVR_HAVE_LPM (!AVR_TINY)
  67 #define AVR_HAVE_LPMX (avr_arch->have_movw_lpmx)
  68 #define AVR_HAVE_ELPM (avr_arch->have_elpm)
  69 #define AVR_HAVE_ELPMX (avr_arch->have_elpmx)
  70 #define AVR_HAVE_RAMPD (avr_arch->have_rampd)
  71 #define AVR_HAVE_RAMPX (avr_arch->have_rampd)
  72 #define AVR_HAVE_RAMPY (avr_arch->have_rampd)
  73 #define AVR_HAVE_RAMPZ (avr_arch->have_elpm             \
  74                         || avr_arch->have_rampd)
  75 #define AVR_HAVE_EIJMP_EICALL (avr_arch->have_eijmp_eicall)
  76
  77 /* Handling of 8-bit SP versus 16-bit SP is as follows:
  78
  79 FIXME: DRIVER_SELF_SPECS has changed.
  80    -msp8 is used internally to select the right multilib for targets with
  81    8-bit SP.  -msp8 is set automatically by DRIVER_SELF_SPECS for devices
  82    with 8-bit SP or by multilib generation machinery.  If a frame pointer is
  83    needed and SP is only 8 bits wide, SP is zero-extended to get FP.
  84
  85    TARGET_TINY_STACK is triggered by -mtiny-stack which is a user option.
  86    This option has no effect on multilib selection.  It serves to save some
  87    bytes on 16-bit SP devices by only changing SP_L and leaving SP_H alone.
  88
  89    These two properties are reflected by built-in macros __AVR_SP8__ resp.
  90    __AVR_HAVE_8BIT_SP__ and __AVR_HAVE_16BIT_SP__.  During multilib generation
  91    there is always __AVR_SP8__ == __AVR_HAVE_8BIT_SP__.  */
  92
  93 #define AVR_HAVE_8BIT_SP                        \
  94   (TARGET_TINY_STACK || avr_sp8)
  95
  96 #define AVR_HAVE_SPH (!avr_sp8)
  97
  98 #define AVR_2_BYTE_PC (!AVR_HAVE_EIJMP_EICALL)
  99 #define AVR_3_BYTE_PC (AVR_HAVE_EIJMP_EICALL)
 100
 101 #define AVR_XMEGA (avr_arch->xmega_p)
 102 #define AVR_TINY  (avr_arch->tiny_p)
 103
 104 #define BITS_BIG_ENDIAN 0
 105 #define BYTES_BIG_ENDIAN 0
 106 #define WORDS_BIG_ENDIAN 0
 107
 108 #ifdef IN_LIBGCC2
 109 /* This is to get correct SI and DI modes in libgcc2.c (32 and 64 bits).  */
 110 #define UNITS_PER_WORD 4
 111 #else
 112 /* Width of a word, in units (bytes).  */
 113 #define UNITS_PER_WORD 1
 114 #endif
 115
 116 #define POINTER_SIZE 16
 117
 118
 119 /* Maximum sized of reasonable data type
 120    DImode or Dfmode ...  */
 121 #define MAX_FIXED_MODE_SIZE 32
 122
 123 #define PARM_BOUNDARY 8
 124
 125 #define FUNCTION_BOUNDARY 8
 126
 127 #define EMPTY_FIELD_BOUNDARY 8
 128
 129 /* No data type wants to be aligned rounder than this.  */
 130 #define BIGGEST_ALIGNMENT 8
 131
 132 #define TARGET_VTABLE_ENTRY_ALIGN 8
 133
 134 #define STRICT_ALIGNMENT 0
 135
 136 #define INT_TYPE_SIZE (TARGET_INT8 ? 8 : 16)
 137 #define SHORT_TYPE_SIZE (INT_TYPE_SIZE == 8 ? INT_TYPE_SIZE : 16)
 138 #define LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 16 : 32)
 139 #define LONG_LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 32 : 64)
 140 #define FLOAT_TYPE_SIZE 32
 141 #define DOUBLE_TYPE_SIZE 32
 142 #define LONG_DOUBLE_TYPE_SIZE 32
 143 #define LONG_LONG_ACCUM_TYPE_SIZE 64
 144
 145 #define DEFAULT_SIGNED_CHAR 1
 146
 147 #define SIZE_TYPE (INT_TYPE_SIZE == 8 ? "long unsigned int" : "unsigned int")
 148 #define PTRDIFF_TYPE (INT_TYPE_SIZE == 8 ? "long int" :"int")
 149
 150 #define WCHAR_TYPE_SIZE 16
 151
 152 #define FIRST_PSEUDO_REGISTER 36
 153
 154 #define FIXED_REGISTERS {\
 155   1,1,/* r0 r1 */\
 156   0,0,/* r2 r3 */\
 157   0,0,/* r4 r5 */\
 158   0,0,/* r6 r7 */\
 159   0,0,/* r8 r9 */\
 160   0,0,/* r10 r11 */\
 161   0,0,/* r12 r13 */\
 162   0,0,/* r14 r15 */\
 163   0,0,/* r16 r17 */\
 164   0,0,/* r18 r19 */\
 165   0,0,/* r20 r21 */\
 166   0,0,/* r22 r23 */\
 167   0,0,/* r24 r25 */\
 168   0,0,/* r26 r27 */\
 169   0,0,/* r28 r29 */\
 170   0,0,/* r30 r31 */\
 171   1,1,/*  STACK */\
 172   1,1 /* arg pointer */  }
 173
 174 #define CALL_USED_REGISTERS {                   \
 175   1,1,/* r0 r1 */                               \
 176     0,0,/* r2 r3 */                             \
 177     0,0,/* r4 r5 */                             \
 178     0,0,/* r6 r7 */                             \
 179     0,0,/* r8 r9 */                             \
 180     0,0,/* r10 r11 */                           \
 181     0,0,/* r12 r13 */                           \
 182     0,0,/* r14 r15 */                           \
 183     0,0,/* r16 r17 */                           \
 184     1,1,/* r18 r19 */                           \
 185     1,1,/* r20 r21 */                           \
 186     1,1,/* r22 r23 */                           \
 187     1,1,/* r24 r25 */                           \
 188     1,1,/* r26 r27 */                           \
 189     0,0,/* r28 r29 */                           \
 190     1,1,/* r30 r31 */                           \
 191     1,1,/*  STACK */                            \
 192     1,1 /* arg pointer */  }
 193
 194 #define REG_ALLOC_ORDER {                       \
 195     24,25,                                      \
 196     18,19,                                      \
 197     20,21,                                      \
 198     22,23,                                      \
 199     30,31,                                      \
 200     26,27,                                      \
 201     28,29,                                      \
 202     17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,    \
 203     0,1,                                        \
 204     32,33,34,35                                 \
 205     }
 206
 207 #define ADJUST_REG_ALLOC_ORDER avr_adjust_reg_alloc_order()
 208
 209
 210 #define HARD_REGNO_NREGS(REGNO, MODE)                                   \
 211   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 212
 213 #define HARD_REGNO_MODE_OK(REGNO, MODE) avr_hard_regno_mode_ok(REGNO, MODE)
 214
 215 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 216
 217 enum reg_class {
 218   NO_REGS,
 219   R0_REG,                       /* r0 */
 220   POINTER_X_REGS,               /* r26 - r27 */
 221   POINTER_Y_REGS,               /* r28 - r29 */
 222   POINTER_Z_REGS,               /* r30 - r31 */
 223   STACK_REG,                    /* STACK */
 224   BASE_POINTER_REGS,            /* r28 - r31 */
 225   POINTER_REGS,                 /* r26 - r31 */
 226   ADDW_REGS,                    /* r24 - r31 */
 227   SIMPLE_LD_REGS,               /* r16 - r23 */
 228   LD_REGS,                      /* r16 - r31 */
 229   NO_LD_REGS,                   /* r0 - r15 */
 230   GENERAL_REGS,                 /* r0 - r31 */
 231   ALL_REGS, LIM_REG_CLASSES
 232 };
 233
 234
 235 #define N_REG_CLASSES (int)LIM_REG_CLASSES
 236
 237 #define REG_CLASS_NAMES {                                       \
 238                  "NO_REGS",                                     \
 239                    "R0_REG",    /* r0 */                        \
 240                    "POINTER_X_REGS", /* r26 - r27 */            \
 241                    "POINTER_Y_REGS", /* r28 - r29 */            \
 242                    "POINTER_Z_REGS", /* r30 - r31 */            \
 243                    "STACK_REG", /* STACK */                     \
 244                    "BASE_POINTER_REGS", /* r28 - r31 */         \
 245                    "POINTER_REGS", /* r26 - r31 */              \
 246                    "ADDW_REGS", /* r24 - r31 */                 \
 247                    "SIMPLE_LD_REGS", /* r16 - r23 */            \
 248                    "LD_REGS",   /* r16 - r31 */                 \
 249                    "NO_LD_REGS", /* r0 - r15 */                 \
 250                    "GENERAL_REGS", /* r0 - r31 */               \
 251                    "ALL_REGS" }
 252
 253 #define REG_CLASS_CONTENTS {                                            \
 254   {0x00000000,0x00000000},      /* NO_REGS */                           \
 255   {0x00000001,0x00000000},      /* R0_REG */                            \
 256   {3u << REG_X,0x00000000},     /* POINTER_X_REGS, r26 - r27 */         \
 257   {3u << REG_Y,0x00000000},     /* POINTER_Y_REGS, r28 - r29 */         \
 258   {3u << REG_Z,0x00000000},     /* POINTER_Z_REGS, r30 - r31 */         \
 259   {0x00000000,0x00000003},      /* STACK_REG, STACK */                  \
 260   {(3u << REG_Y) | (3u << REG_Z),                                       \
 261      0x00000000},               /* BASE_POINTER_REGS, r28 - r31 */      \
 262   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z),                       \
 263      0x00000000},               /* POINTER_REGS, r26 - r31 */           \
 264   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z) | (3u << REG_W),       \
 265      0x00000000},               /* ADDW_REGS, r24 - r31 */              \
 266   {0x00ff0000,0x00000000},      /* SIMPLE_LD_REGS r16 - r23 */          \
 267   {(3u << REG_X)|(3u << REG_Y)|(3u << REG_Z)|(3u << REG_W)|(0xffu << 16),\
 268      0x00000000},       /* LD_REGS, r16 - r31 */                        \
 269   {0x0000ffff,0x00000000},      /* NO_LD_REGS  r0 - r15 */              \
 270   {0xffffffff,0x00000000},      /* GENERAL_REGS, r0 - r31 */            \
 271   {0xffffffff,0x00000003}       /* ALL_REGS */                          \
 272 }
 273
 274 #define REGNO_REG_CLASS(R) avr_regno_reg_class(R)
 275
 276 #define MODE_CODE_BASE_REG_CLASS(mode, as, outer_code, index_code)   \
 277   avr_mode_code_base_reg_class (mode, as, outer_code, index_code)
 278
 279 #define INDEX_REG_CLASS NO_REGS
 280
 281 #define REGNO_MODE_CODE_OK_FOR_BASE_P(num, mode, as, outer_code, index_code) \
 282   avr_regno_mode_code_ok_for_base_p (num, mode, as, outer_code, index_code)
 283
 284 #define REGNO_OK_FOR_INDEX_P(NUM) 0
 285
 286 #define HARD_REGNO_CALL_PART_CLOBBERED(REGNO, MODE)     \
 287   avr_hard_regno_call_part_clobbered (REGNO, MODE)
 288
 289 #define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true
 290
 291 #define STACK_PUSH_CODE POST_DEC
 292
 293 #define STACK_GROWS_DOWNWARD 1
 294
 295 #define STARTING_FRAME_OFFSET avr_starting_frame_offset()
 296
 297 #define STACK_POINTER_OFFSET 1
 298
 299 #define FIRST_PARM_OFFSET(FUNDECL) 0
 300
 301 #define STACK_BOUNDARY 8
 302
 303 #define STACK_POINTER_REGNUM 32
 304
 305 #define FRAME_POINTER_REGNUM REG_Y
 306
 307 #define ARG_POINTER_REGNUM 34
 308
 309 #define STATIC_CHAIN_REGNUM ((AVR_TINY) ? 18 :2)
 310
 311 #define ELIMINABLE_REGS {                                       \
 312     { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM },               \
 313     { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM },               \
 314     { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },             \
 315     { FRAME_POINTER_REGNUM + 1, STACK_POINTER_REGNUM + 1 } }
 316
 317 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 318   OFFSET = avr_initial_elimination_offset (FROM, TO)
 319
 320 #define RETURN_ADDR_RTX(count, tem) avr_return_addr_rtx (count, tem)
 321
 322 /* Don't use Push rounding. expr.c: emit_single_push_insn is broken
 323    for POST_DEC targets (PR27386).  */
 324 /*#define PUSH_ROUNDING(NPUSHED) (NPUSHED)*/
 325
 326 typedef struct avr_args
 327 {
 328   /* # Registers available for passing */
 329   int nregs;
 330
 331   /* Next available register number */
 332   int regno;
 333 } CUMULATIVE_ARGS;
 334
 335 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 336   avr_init_cumulative_args (&(CUM), FNTYPE, LIBNAME, FNDECL)
 337
 338 #define FUNCTION_ARG_REGNO_P(r) avr_function_arg_regno_p(r)
 339
 340 #define DEFAULT_PCC_STRUCT_RETURN 0
 341
 342 #define EPILOGUE_USES(REGNO) avr_epilogue_uses(REGNO)
 343
 344 #define HAVE_POST_INCREMENT 1
 345 #define HAVE_PRE_DECREMENT 1
 346
 347 #define MAX_REGS_PER_ADDRESS 1
 348
 349 #define LEGITIMIZE_RELOAD_ADDRESS(X,MODE,OPNUM,TYPE,IND_L,WIN)          \
 350   do {                                                                  \
 351     rtx new_x = avr_legitimize_reload_address (&(X), MODE, OPNUM, TYPE, \
 352                                                ADDR_TYPE (TYPE),        \
 353                                                IND_L, make_memloc);     \
 354     if (new_x)                                                          \
 355       {                                                                 \
 356         X = new_x;                                                      \
 357         goto WIN;                                                       \
 358       }                                                                 \
 359   } while (0)
 360
 361 #define BRANCH_COST(speed_p, predictable_p) avr_branch_cost
 362
 363 #define SLOW_BYTE_ACCESS 0
 364
 365 #define NO_FUNCTION_CSE 1
 366
 367 #define REGISTER_TARGET_PRAGMAS()                                       \
 368   do {                                                                  \
 369     avr_register_target_pragmas();                                      \
 370   } while (0)
 371
 372 #define TEXT_SECTION_ASM_OP "\t.text"
 373
 374 #define DATA_SECTION_ASM_OP "\t.data"
 375
 376 #define BSS_SECTION_ASM_OP "\t.section .bss"
 377
 378 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
 379    There are no shared libraries on this target, and these sections are
 380    placed in the read-only program memory, so they are not writable.  */
 381
 382 #undef CTORS_SECTION_ASM_OP
 383 #define CTORS_SECTION_ASM_OP "\t.section .ctors,\"a\",@progbits"
 384
 385 #undef DTORS_SECTION_ASM_OP
 386 #define DTORS_SECTION_ASM_OP "\t.section .dtors,\"a\",@progbits"
 387
 388 #define TARGET_ASM_CONSTRUCTOR avr_asm_out_ctor
 389
 390 #define TARGET_ASM_DESTRUCTOR avr_asm_out_dtor
 391
 392 #define SUPPORTS_INIT_PRIORITY 0
 393
 394 #define JUMP_TABLES_IN_TEXT_SECTION 0
 395
 396 #define ASM_COMMENT_START " ; "
 397
 398 #define ASM_APP_ON "/* #APP */\n"
 399
 400 #define ASM_APP_OFF "/* #NOAPP */\n"
 401
 402 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) ((C) == '\n' || ((C) == '$'))
 403
 404 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(STREAM, DECL, NAME, SIZE, ALIGN) \
 405   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, false)
 406
 407 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 408   avr_asm_asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN, \
 409                                   asm_output_aligned_bss)
 410
 411 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(STREAM, DECL, NAME, SIZE, ALIGN)  \
 412   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, true)
 413
 414 /* Globalizing directive for a label.  */
 415 #define GLOBAL_ASM_OP ".global\t"
 416
 417 #define SUPPORTS_WEAK 1
 418
 419 #define HAS_INIT_SECTION 1
 420
 421 #define REGISTER_NAMES {                                \
 422   "r0","r1","r2","r3","r4","r5","r6","r7",              \
 423     "r8","r9","r10","r11","r12","r13","r14","r15",      \
 424     "r16","r17","r18","r19","r20","r21","r22","r23",    \
 425     "r24","r25","r26","r27","r28","r29","r30","r31",    \
 426     "__SP_L__","__SP_H__","argL","argH"}
 427
 428 #define FINAL_PRESCAN_INSN(insn, operand, nop)  \
 429   avr_final_prescan_insn (insn, operand,nop)
 430
 431 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO)      \
 432 {                                               \
 433   gcc_assert (REGNO < 32);                      \
 434   fprintf (STREAM, "\tpush\tr%d", REGNO);       \
 435 }
 436
 437 #define ASM_OUTPUT_REG_POP(STREAM, REGNO)       \
 438 {                                               \
 439   gcc_assert (REGNO < 32);                      \
 440   fprintf (STREAM, "\tpop\tr%d", REGNO);        \
 441 }
 442
 443 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE)  \
 444   avr_output_addr_vec_elt (STREAM, VALUE)
 445
 446 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 447   do {                                                  \
 448     if ((POWER) > 0)                                    \
 449       fprintf (STREAM, "\t.p2align\t%d\n", POWER);      \
 450   } while (0)
 451
 452 #define CASE_VECTOR_MODE HImode
 453
 454 #undef WORD_REGISTER_OPERATIONS
 455
 456 #define MOVE_MAX 4
 457
 458 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 459
 460 #define Pmode HImode
 461
 462 #define FUNCTION_MODE HImode
 463
 464 #define DOLLARS_IN_IDENTIFIERS 0
 465
 466 #define TRAMPOLINE_SIZE 4
 467
 468 /* Store in cc_status the expressions
 469    that the condition codes will describe
 470    after execution of an instruction whose pattern is EXP.
 471    Do not alter them if the instruction would not alter the cc's.  */
 472
 473 #define NOTICE_UPDATE_CC(EXP, INSN) avr_notice_update_cc (EXP, INSN)
 474
 475 /* The add insns don't set overflow in a usable way.  */
 476 #define CC_OVERFLOW_UNUSABLE 01000
 477 /* The mov,and,or,xor insns don't set carry.  That's ok though as the
 478    Z bit is all we need when doing unsigned comparisons on the result of
 479    these insns (since they're always with 0).  However, conditions.h has
 480    CC_NO_OVERFLOW defined for this purpose.  Rename it to something more
 481    understandable.  */
 482 #define CC_NO_CARRY CC_NO_OVERFLOW
 483
 484
 485 /* Output assembler code to FILE to increment profiler label # LABELNO
 486    for profiling a function entry.  */
 487
 488 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 489   fprintf (FILE, "/* profiler %d */", (LABELNO))
 490
 491 #define ADJUST_INSN_LENGTH(INSN, LENGTH)                \
 492     (LENGTH = avr_adjust_insn_length (INSN, LENGTH))
 493
 494 extern const char *avr_devicespecs_file (int, const char**);
 495
 496 #define EXTRA_SPEC_FUNCTIONS                                   \
 497   { "device-specs-file", avr_devicespecs_file },
 498
 499 /* Driver self specs has lmited functionality w.r.t. '%s' for dynamic specs.
 500    Apply '%s' to a static string to inflate the file (directory) name which
 501    is used to diagnose problems with reading the specs file.  */
 502
 503 #undef  DRIVER_SELF_SPECS
 504 #define DRIVER_SELF_SPECS                       \
 505   " %:device-specs-file(device-specs%s %{mmcu=*:%*})"
 506
 507 /* No libstdc++ for now.  Empty string doesn't work.  */
 508 #define LIBSTDCXX "gcc"
 509
 510 /* This is the default without any -mmcu=* option.  */
 511 #define MULTILIB_DEFAULTS { "mmcu=" AVR_MMCU_DEFAULT }
 512
 513 #define TEST_HARD_REG_CLASS(CLASS, REGNO) \
 514   TEST_HARD_REG_BIT (reg_class_contents[ (int) (CLASS)], REGNO)
 515
 516 #define CR_TAB "\n\t"
 517
 518 #define DWARF2_ADDR_SIZE 4
 519
 520 #define INCOMING_RETURN_ADDR_RTX   avr_incoming_return_addr_rtx ()
 521 #define INCOMING_FRAME_SP_OFFSET   (AVR_3_BYTE_PC ? 3 : 2)
 522
 523 /* The caller's stack pointer value immediately before the call
 524    is one byte below the first argument.  */
 525 #define ARG_POINTER_CFA_OFFSET(FNDECL)  -1
 526
 527 #define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
 528   avr_hard_regno_rename_ok (OLD_REG, NEW_REG)
 529
 530 /* A C structure for machine-specific, per-function data.
 531    This is added to the cfun structure.  */
 532 struct GTY(()) machine_function
 533 {
 534   /* 'true' - if current function is a naked function.  */
 535   int is_naked;
 536
 537   /* 'true' - if current function is an interrupt function
 538      as specified by the "interrupt" attribute.  */
 539   int is_interrupt;
 540
 541   /* 'true' - if current function is a signal function
 542      as specified by the "signal" attribute.  */
 543   int is_signal;
 544
 545   /* 'true' - if current function is a 'task' function
 546      as specified by the "OS_task" attribute.  */
 547   int is_OS_task;
 548
 549   /* 'true' - if current function is a 'main' function
 550      as specified by the "OS_main" attribute.  */
 551   int is_OS_main;
 552
 553   /* Current function stack size.  */
 554   int stack_usage;
 555
 556   /* 'true' if a callee might be tail called */
 557   int sibcall_fails;
 558
 559   /* 'true' if the above is_foo predicates are sanity-checked to avoid
 560      multiple diagnose for the same function.  */
 561   int attributes_checked_p;
 562 };
 563
 564 /* AVR does not round pushes, but the existence of this macro is
 565    required in order for pushes to be generated.  */
 566 #define PUSH_ROUNDING(X)        (X)
 567
 568 /* Define prototype here to avoid build warning.  Some files using
 569    ACCUMULATE_OUTGOING_ARGS (directly or indirectly) include
 570    tm.h but not tm_p.h.  */
 571 extern int avr_accumulate_outgoing_args (void);
 572 #define ACCUMULATE_OUTGOING_ARGS avr_accumulate_outgoing_args()
 573
 574 #define INIT_EXPANDERS avr_init_expanders()
 575
 576 /* Flags used for io and address attributes.  */
 577 #define SYMBOL_FLAG_IO_LOW      (SYMBOL_FLAG_MACH_DEP << 4)
 578 #define SYMBOL_FLAG_IO          (SYMBOL_FLAG_MACH_DEP << 5)
 579 #define SYMBOL_FLAG_ADDRESS     (SYMBOL_FLAG_MACH_DEP << 6)