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) 1998-2021 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 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(mode, comparison) \
 111   avr_float_lib_compare_returns_bool (mode, comparison)
 112
 113 #ifdef IN_LIBGCC2
 114 /* This is to get correct SI and DI modes in libgcc2.c (32 and 64 bits).  */
 115 #define UNITS_PER_WORD 4
 116 #else
 117 /* Width of a word, in units (bytes).  */
 118 #define UNITS_PER_WORD 1
 119 #endif
 120
 121 #define POINTER_SIZE 16
 122
 123
 124 /* Maximum sized of reasonable data type
 125    DImode or Dfmode ...  */
 126 #define MAX_FIXED_MODE_SIZE 32
 127
 128 #define PARM_BOUNDARY 8
 129
 130 #define FUNCTION_BOUNDARY 8
 131
 132 #define EMPTY_FIELD_BOUNDARY 8
 133
 134 /* No data type wants to be aligned rounder than this.  */
 135 #define BIGGEST_ALIGNMENT 8
 136
 137 #define TARGET_VTABLE_ENTRY_ALIGN 8
 138
 139 #define STRICT_ALIGNMENT 0
 140
 141 #define INT_TYPE_SIZE (TARGET_INT8 ? 8 : 16)
 142 #define SHORT_TYPE_SIZE (INT_TYPE_SIZE == 8 ? INT_TYPE_SIZE : 16)
 143 #define LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 16 : 32)
 144 #define LONG_LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 32 : 64)
 145 #define FLOAT_TYPE_SIZE 32
 146 #define DOUBLE_TYPE_SIZE (avr_double)
 147 #define LONG_DOUBLE_TYPE_SIZE (avr_long_double)
 148
 149 #define LONG_LONG_ACCUM_TYPE_SIZE 64
 150
 151 #define DEFAULT_SIGNED_CHAR 1
 152
 153 #define SIZE_TYPE (INT_TYPE_SIZE == 8 ? "long unsigned int" : "unsigned int")
 154 #define PTRDIFF_TYPE (INT_TYPE_SIZE == 8 ? "long int" :"int")
 155
 156 #define WCHAR_TYPE_SIZE 16
 157
 158 #define FIRST_PSEUDO_REGISTER 36
 159
 160 #define GENERAL_REGNO_P(N)      IN_RANGE (N, 2, 31)
 161 #define GENERAL_REG_P(X)        (REG_P (X) && GENERAL_REGNO_P (REGNO (X)))
 162
 163 #define FIXED_REGISTERS {\
 164   1,1,/* r0 r1 */\
 165   0,0,/* r2 r3 */\
 166   0,0,/* r4 r5 */\
 167   0,0,/* r6 r7 */\
 168   0,0,/* r8 r9 */\
 169   0,0,/* r10 r11 */\
 170   0,0,/* r12 r13 */\
 171   0,0,/* r14 r15 */\
 172   0,0,/* r16 r17 */\
 173   0,0,/* r18 r19 */\
 174   0,0,/* r20 r21 */\
 175   0,0,/* r22 r23 */\
 176   0,0,/* r24 r25 */\
 177   0,0,/* r26 r27 */\
 178   0,0,/* r28 r29 */\
 179   0,0,/* r30 r31 */\
 180   1,1,/*  STACK */\
 181   1,1 /* arg pointer */  }
 182
 183 #define CALL_USED_REGISTERS {                   \
 184   1,1,/* r0 r1 */                               \
 185     0,0,/* r2 r3 */                             \
 186     0,0,/* r4 r5 */                             \
 187     0,0,/* r6 r7 */                             \
 188     0,0,/* r8 r9 */                             \
 189     0,0,/* r10 r11 */                           \
 190     0,0,/* r12 r13 */                           \
 191     0,0,/* r14 r15 */                           \
 192     0,0,/* r16 r17 */                           \
 193     1,1,/* r18 r19 */                           \
 194     1,1,/* r20 r21 */                           \
 195     1,1,/* r22 r23 */                           \
 196     1,1,/* r24 r25 */                           \
 197     1,1,/* r26 r27 */                           \
 198     0,0,/* r28 r29 */                           \
 199     1,1,/* r30 r31 */                           \
 200     1,1,/*  STACK */                            \
 201     1,1 /* arg pointer */  }
 202
 203 #define REG_ALLOC_ORDER {                       \
 204     24,25,                                      \
 205     18,19,                                      \
 206     20,21,                                      \
 207     22,23,                                      \
 208     30,31,                                      \
 209     26,27,                                      \
 210     28,29,                                      \
 211     17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,    \
 212     0,1,                                        \
 213     32,33,34,35                                 \
 214     }
 215
 216 #define ADJUST_REG_ALLOC_ORDER avr_adjust_reg_alloc_order()
 217
 218
 219 enum reg_class {
 220   NO_REGS,
 221   R0_REG,                       /* r0 */
 222   POINTER_X_REGS,               /* r26 - r27 */
 223   POINTER_Y_REGS,               /* r28 - r29 */
 224   POINTER_Z_REGS,               /* r30 - r31 */
 225   STACK_REG,                    /* STACK */
 226   BASE_POINTER_REGS,            /* r28 - r31 */
 227   POINTER_REGS,                 /* r26 - r31 */
 228   ADDW_REGS,                    /* r24 - r31 */
 229   SIMPLE_LD_REGS,               /* r16 - r23 */
 230   LD_REGS,                      /* r16 - r31 */
 231   NO_LD_REGS,                   /* r0 - r15 */
 232   GENERAL_REGS,                 /* r0 - r31 */
 233   ALL_REGS, LIM_REG_CLASSES
 234 };
 235
 236
 237 #define N_REG_CLASSES (int)LIM_REG_CLASSES
 238
 239 #define REG_CLASS_NAMES {                                       \
 240                  "NO_REGS",                                     \
 241                    "R0_REG",    /* r0 */                        \
 242                    "POINTER_X_REGS", /* r26 - r27 */            \
 243                    "POINTER_Y_REGS", /* r28 - r29 */            \
 244                    "POINTER_Z_REGS", /* r30 - r31 */            \
 245                    "STACK_REG", /* STACK */                     \
 246                    "BASE_POINTER_REGS", /* r28 - r31 */         \
 247                    "POINTER_REGS", /* r26 - r31 */              \
 248                    "ADDW_REGS", /* r24 - r31 */                 \
 249                    "SIMPLE_LD_REGS", /* r16 - r23 */            \
 250                    "LD_REGS",   /* r16 - r31 */                 \
 251                    "NO_LD_REGS", /* r0 - r15 */                 \
 252                    "GENERAL_REGS", /* r0 - r31 */               \
 253                    "ALL_REGS" }
 254
 255 #define REG_CLASS_CONTENTS {                                            \
 256   {0x00000000,0x00000000},      /* NO_REGS */                           \
 257   {0x00000001,0x00000000},      /* R0_REG */                            \
 258   {3u << REG_X,0x00000000},     /* POINTER_X_REGS, r26 - r27 */         \
 259   {3u << REG_Y,0x00000000},     /* POINTER_Y_REGS, r28 - r29 */         \
 260   {3u << REG_Z,0x00000000},     /* POINTER_Z_REGS, r30 - r31 */         \
 261   {0x00000000,0x00000003},      /* STACK_REG, STACK */                  \
 262   {(3u << REG_Y) | (3u << REG_Z),                                       \
 263      0x00000000},               /* BASE_POINTER_REGS, r28 - r31 */      \
 264   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z),                       \
 265      0x00000000},               /* POINTER_REGS, r26 - r31 */           \
 266   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z) | (3u << REG_W),       \
 267      0x00000000},               /* ADDW_REGS, r24 - r31 */              \
 268   {0x00ff0000,0x00000000},      /* SIMPLE_LD_REGS r16 - r23 */          \
 269   {(3u << REG_X)|(3u << REG_Y)|(3u << REG_Z)|(3u << REG_W)|(0xffu << 16),\
 270      0x00000000},       /* LD_REGS, r16 - r31 */                        \
 271   {0x0000ffff,0x00000000},      /* NO_LD_REGS  r0 - r15 */              \
 272   {0xffffffff,0x00000000},      /* GENERAL_REGS, r0 - r31 */            \
 273   {0xffffffff,0x00000003}       /* ALL_REGS */                          \
 274 }
 275
 276 #define REGNO_REG_CLASS(R) avr_regno_reg_class(R)
 277
 278 #define MODE_CODE_BASE_REG_CLASS(mode, as, outer_code, index_code)   \
 279   avr_mode_code_base_reg_class (mode, as, outer_code, index_code)
 280
 281 #define INDEX_REG_CLASS NO_REGS
 282
 283 #define REGNO_MODE_CODE_OK_FOR_BASE_P(num, mode, as, outer_code, index_code) \
 284   avr_regno_mode_code_ok_for_base_p (num, mode, as, outer_code, index_code)
 285
 286 #define REGNO_OK_FOR_INDEX_P(NUM) 0
 287
 288 #define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true
 289
 290 #define STACK_PUSH_CODE POST_DEC
 291
 292 #define STACK_GROWS_DOWNWARD 1
 293
 294 #define STACK_POINTER_OFFSET 1
 295
 296 #define FIRST_PARM_OFFSET(FUNDECL) 0
 297
 298 #define STACK_BOUNDARY 8
 299
 300 #define STACK_POINTER_REGNUM 32
 301
 302 #define FRAME_POINTER_REGNUM REG_Y
 303
 304 #define ARG_POINTER_REGNUM 34
 305
 306 #define STATIC_CHAIN_REGNUM ((AVR_TINY) ? 18 :2)
 307
 308 #define ELIMINABLE_REGS {                                       \
 309     { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM },               \
 310     { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM },               \
 311     { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },             \
 312     { FRAME_POINTER_REGNUM + 1, STACK_POINTER_REGNUM + 1 } }
 313
 314 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 315   OFFSET = avr_initial_elimination_offset (FROM, TO)
 316
 317 #define RETURN_ADDR_RTX(count, tem) avr_return_addr_rtx (count, tem)
 318
 319 /* Don't use Push rounding. expr.c: emit_single_push_insn is broken
 320    for POST_DEC targets (PR27386).  */
 321 /*#define PUSH_ROUNDING(NPUSHED) (NPUSHED)*/
 322
 323 typedef struct avr_args
 324 {
 325   /* # Registers available for passing */
 326   int nregs;
 327
 328   /* Next available register number */
 329   int regno;
 330 } CUMULATIVE_ARGS;
 331
 332 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 333   avr_init_cumulative_args (&(CUM), FNTYPE, LIBNAME, FNDECL)
 334
 335 #define FUNCTION_ARG_REGNO_P(r) avr_function_arg_regno_p(r)
 336
 337 #define DEFAULT_PCC_STRUCT_RETURN 0
 338
 339 #define EPILOGUE_USES(REGNO) avr_epilogue_uses(REGNO)
 340
 341 #define HAVE_POST_INCREMENT 1
 342 #define HAVE_PRE_DECREMENT 1
 343
 344 #define MAX_REGS_PER_ADDRESS 1
 345
 346 #define LEGITIMIZE_RELOAD_ADDRESS(X,MODE,OPNUM,TYPE,IND_L,WIN)          \
 347   do {                                                                  \
 348     rtx new_x = avr_legitimize_reload_address (&(X), MODE, OPNUM, TYPE, \
 349                                                ADDR_TYPE (TYPE),        \
 350                                                IND_L, make_memloc);     \
 351     if (new_x)                                                          \
 352       {                                                                 \
 353         X = new_x;                                                      \
 354         goto WIN;                                                       \
 355       }                                                                 \
 356   } while (0)
 357
 358 /* We increase branch costs after reload in order to keep basic-block
 359    reordering from introducing out-of-line jumps and to prefer fall-through
 360    edges instead.  The default branch costs are 0, mainly because otherwise
 361    do_store_flag might come up with bloated code.  */
 362 #define BRANCH_COST(speed_p, predictable_p)     \
 363   (avr_branch_cost + (reload_completed ? 4 : 0))
 364
 365 #define SLOW_BYTE_ACCESS 0
 366
 367 #define NO_FUNCTION_CSE 1
 368
 369 #define REGISTER_TARGET_PRAGMAS()                                       \
 370   do {                                                                  \
 371     avr_register_target_pragmas();                                      \
 372   } while (0)
 373
 374 #define TEXT_SECTION_ASM_OP "\t.text"
 375
 376 #define DATA_SECTION_ASM_OP "\t.data"
 377
 378 #define BSS_SECTION_ASM_OP "\t.section .bss"
 379
 380 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
 381    There are no shared libraries on this target, and these sections are
 382    placed in the read-only program memory, so they are not writable.  */
 383
 384 #undef CTORS_SECTION_ASM_OP
 385 #define CTORS_SECTION_ASM_OP "\t.section .ctors,\"a\",@progbits"
 386
 387 #undef DTORS_SECTION_ASM_OP
 388 #define DTORS_SECTION_ASM_OP "\t.section .dtors,\"a\",@progbits"
 389
 390 #define TARGET_ASM_CONSTRUCTOR avr_asm_out_ctor
 391
 392 #define TARGET_ASM_DESTRUCTOR avr_asm_out_dtor
 393
 394 #define SUPPORTS_INIT_PRIORITY 0
 395
 396 /* We pretend jump tables are in text section because otherwise,
 397    final.c will switch to .rodata before jump tables and thereby
 398    triggers __do_copy_data.  As we implement ASM_OUTPUT_ADDR_VEC,
 399    we still have full control over the jump tables themselves.  */
 400 #define JUMP_TABLES_IN_TEXT_SECTION 1
 401
 402 #define ASM_COMMENT_START " ; "
 403
 404 #define ASM_APP_ON "/* #APP */\n"
 405
 406 #define ASM_APP_OFF "/* #NOAPP */\n"
 407
 408 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) ((C) == '\n' || ((C) == '$'))
 409
 410 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(STREAM, DECL, NAME, SIZE, ALIGN) \
 411   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, false)
 412
 413 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 414   avr_asm_asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN, \
 415                                   asm_output_aligned_bss)
 416
 417 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(STREAM, DECL, NAME, SIZE, ALIGN)  \
 418   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, true)
 419
 420 /* Globalizing directive for a label.  */
 421 #define GLOBAL_ASM_OP ".global\t"
 422
 423 #define SUPPORTS_WEAK 1
 424
 425 #define HAS_INIT_SECTION 1
 426
 427 #define REGISTER_NAMES {                                \
 428   "r0","r1","r2","r3","r4","r5","r6","r7",              \
 429     "r8","r9","r10","r11","r12","r13","r14","r15",      \
 430     "r16","r17","r18","r19","r20","r21","r22","r23",    \
 431     "r24","r25","r26","r27","r28","r29","r30","r31",    \
 432     "__SP_L__","__SP_H__","argL","argH"}
 433
 434 #define FINAL_PRESCAN_INSN(insn, operand, nop)  \
 435   avr_final_prescan_insn (insn, operand,nop)
 436
 437 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO)      \
 438 {                                               \
 439   gcc_assert (REGNO < 32);                      \
 440   fprintf (STREAM, "\tpush\tr%d", REGNO);       \
 441 }
 442
 443 #define ASM_OUTPUT_REG_POP(STREAM, REGNO)       \
 444 {                                               \
 445   gcc_assert (REGNO < 32);                      \
 446   fprintf (STREAM, "\tpop\tr%d", REGNO);        \
 447 }
 448
 449 #define ASM_OUTPUT_ADDR_VEC(TLABEL, TDATA)      \
 450   avr_output_addr_vec (TLABEL, TDATA)
 451
 452 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 453   do {                                                  \
 454     if ((POWER) > 0)                                    \
 455       fprintf (STREAM, "\t.p2align\t%d\n", POWER);      \
 456   } while (0)
 457
 458 #define CASE_VECTOR_MODE HImode
 459
 460 #undef WORD_REGISTER_OPERATIONS
 461
 462 /* Can move only a single byte from memory to reg in a
 463    single instruction. */
 464
 465 #define MOVE_MAX 1
 466
 467 /* Allow upto two bytes moves to occur using by_pieces
 468    infrastructure */
 469
 470 #define MOVE_MAX_PIECES 2
 471
 472 /* Set MOVE_RATIO to 3 to allow memory moves upto 4 bytes to happen
 473    by pieces when optimizing for speed, like it did when MOVE_MAX_PIECES
 474    was 4. When optimizing for size, allow memory moves upto 2 bytes.
 475    Also see avr_use_by_pieces_infrastructure_p. */
 476
 477 #define MOVE_RATIO(speed) ((speed) ? 3 : 2)
 478
 479 #define Pmode HImode
 480
 481 #define FUNCTION_MODE HImode
 482
 483 #define DOLLARS_IN_IDENTIFIERS 0
 484
 485 #define TRAMPOLINE_SIZE 4
 486
 487 /* Store in cc_status the expressions
 488    that the condition codes will describe
 489    after execution of an instruction whose pattern is EXP.
 490    Do not alter them if the instruction would not alter the cc's.  */
 491
 492 #define NOTICE_UPDATE_CC(EXP, INSN) avr_notice_update_cc (EXP, INSN)
 493
 494 /* The add insns don't set overflow in a usable way.  */
 495 #define CC_OVERFLOW_UNUSABLE 01000
 496 /* The mov,and,or,xor insns don't set carry.  That's ok though as the
 497    Z bit is all we need when doing unsigned comparisons on the result of
 498    these insns (since they're always with 0).  However, conditions.h has
 499    CC_NO_OVERFLOW defined for this purpose.  Rename it to something more
 500    understandable.  */
 501 #define CC_NO_CARRY CC_NO_OVERFLOW
 502
 503
 504 /* Output assembler code to FILE to increment profiler label # LABELNO
 505    for profiling a function entry.  */
 506
 507 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 508   fprintf (FILE, "/* profiler %d */", (LABELNO))
 509
 510 #define ADJUST_INSN_LENGTH(INSN, LENGTH)                \
 511     (LENGTH = avr_adjust_insn_length (INSN, LENGTH))
 512
 513 extern const char *avr_devicespecs_file (int, const char**);
 514 extern const char *avr_double_lib (int, const char**);
 515
 516 #define EXTRA_SPEC_FUNCTIONS                            \
 517   { "double-lib", avr_double_lib },                     \
 518   { "device-specs-file", avr_devicespecs_file },
 519
 520 /* Driver self specs has lmited functionality w.r.t. '%s' for dynamic specs.
 521    Apply '%s' to a static string to inflate the file (directory) name which
 522    is used to diagnose problems with reading the specs file.  */
 523
 524 #undef  DRIVER_SELF_SPECS
 525 #define DRIVER_SELF_SPECS                               \
 526   " %:double-lib(%{m*:m%*})"                            \
 527   " %:device-specs-file(device-specs%s %{mmcu=*:%*})"
 528
 529 /* No libstdc++ for now.  Empty string doesn't work.  */
 530 #define LIBSTDCXX "gcc"
 531
 532 /* This is the default without any -mmcu=* option.  */
 533 #define MULTILIB_DEFAULTS { "mmcu=" AVR_MMCU_DEFAULT }
 534
 535 #define TEST_HARD_REG_CLASS(CLASS, REGNO) \
 536   TEST_HARD_REG_BIT (reg_class_contents[ (int) (CLASS)], REGNO)
 537
 538 #define CR_TAB "\n\t"
 539
 540 #define DWARF2_ADDR_SIZE 4
 541
 542 #define INCOMING_RETURN_ADDR_RTX   avr_incoming_return_addr_rtx ()
 543 #define INCOMING_FRAME_SP_OFFSET   (AVR_3_BYTE_PC ? 3 : 2)
 544
 545 /* The caller's stack pointer value immediately before the call
 546    is one byte below the first argument.  */
 547 #define ARG_POINTER_CFA_OFFSET(FNDECL)  -1
 548
 549 #define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
 550   avr_hard_regno_rename_ok (OLD_REG, NEW_REG)
 551
 552 /* A C structure for machine-specific, per-function data.
 553    This is added to the cfun structure.  */
 554 struct GTY(()) machine_function
 555 {
 556   /* 'true' - if current function is a naked function.  */
 557   int is_naked;
 558
 559   /* 'true' - if current function is an interrupt function
 560      as specified by the "interrupt" attribute.  */
 561   int is_interrupt;
 562
 563   /* 'true' - if current function is a signal function
 564      as specified by the "signal" attribute.  */
 565   int is_signal;
 566
 567   /* 'true' - if current function is a 'task' function
 568      as specified by the "OS_task" attribute.  */
 569   int is_OS_task;
 570
 571   /* 'true' - if current function is a 'main' function
 572      as specified by the "OS_main" attribute.  */
 573   int is_OS_main;
 574
 575   /* Current function stack size.  */
 576   int stack_usage;
 577
 578   /* 'true' if a callee might be tail called */
 579   int sibcall_fails;
 580
 581   /* 'true' if the above is_foo predicates are sanity-checked to avoid
 582      multiple diagnose for the same function.  */
 583   int attributes_checked_p;
 584
 585   /* 'true' - if current function shall not use '__gcc_isr' pseudo
 586      instructions as specified by the "no_gccisr" attribute.  */
 587   int is_no_gccisr;
 588
 589   /* Used for `__gcc_isr' pseudo instruction handling of
 590      non-naked ISR prologue / epilogue(s).  */
 591   struct
 592   {
 593     /* 'true' if this function actually uses "*gasisr" insns. */
 594     int yes;
 595     /* 'true' if this function is allowed to use "*gasisr" insns. */
 596     int maybe;
 597     /* The register numer as printed by the Done chunk.  */
 598     int regno;
 599   } gasisr;
 600
 601   /* 'true' if this function references .L__stack_usage like with
 602      __builtin_return_address.  */
 603   int use_L__stack_usage;
 604 };
 605
 606 /* AVR does not round pushes, but the existence of this macro is
 607    required in order for pushes to be generated.  */
 608 #define PUSH_ROUNDING(X)        (X)
 609
 610 /* Define prototype here to avoid build warning.  Some files using
 611    ACCUMULATE_OUTGOING_ARGS (directly or indirectly) include
 612    tm.h but not tm_p.h.  */
 613 extern int avr_accumulate_outgoing_args (void);
 614 #define ACCUMULATE_OUTGOING_ARGS avr_accumulate_outgoing_args()
 615
 616 #define INIT_EXPANDERS avr_init_expanders()
 617
 618 /* Flags used for io and address attributes.  */
 619 #define SYMBOL_FLAG_IO_LOW      (SYMBOL_FLAG_MACH_DEP << 4)
 620 #define SYMBOL_FLAG_IO          (SYMBOL_FLAG_MACH_DEP << 5)
 621 #define SYMBOL_FLAG_ADDRESS     (SYMBOL_FLAG_MACH_DEP << 6)