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) 1998-2018 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 GENERAL_REGNO_P(N)      IN_RANGE (N, 2, 31)
 157 #define GENERAL_REG_P(X)        (REG_P (X) && GENERAL_REGNO_P (REGNO (X)))
 158
 159 #define FIXED_REGISTERS {\
 160   1,1,/* r0 r1 */\
 161   0,0,/* r2 r3 */\
 162   0,0,/* r4 r5 */\
 163   0,0,/* r6 r7 */\
 164   0,0,/* r8 r9 */\
 165   0,0,/* r10 r11 */\
 166   0,0,/* r12 r13 */\
 167   0,0,/* r14 r15 */\
 168   0,0,/* r16 r17 */\
 169   0,0,/* r18 r19 */\
 170   0,0,/* r20 r21 */\
 171   0,0,/* r22 r23 */\
 172   0,0,/* r24 r25 */\
 173   0,0,/* r26 r27 */\
 174   0,0,/* r28 r29 */\
 175   0,0,/* r30 r31 */\
 176   1,1,/*  STACK */\
 177   1,1 /* arg pointer */  }
 178
 179 #define CALL_USED_REGISTERS {                   \
 180   1,1,/* r0 r1 */                               \
 181     0,0,/* r2 r3 */                             \
 182     0,0,/* r4 r5 */                             \
 183     0,0,/* r6 r7 */                             \
 184     0,0,/* r8 r9 */                             \
 185     0,0,/* r10 r11 */                           \
 186     0,0,/* r12 r13 */                           \
 187     0,0,/* r14 r15 */                           \
 188     0,0,/* r16 r17 */                           \
 189     1,1,/* r18 r19 */                           \
 190     1,1,/* r20 r21 */                           \
 191     1,1,/* r22 r23 */                           \
 192     1,1,/* r24 r25 */                           \
 193     1,1,/* r26 r27 */                           \
 194     0,0,/* r28 r29 */                           \
 195     1,1,/* r30 r31 */                           \
 196     1,1,/*  STACK */                            \
 197     1,1 /* arg pointer */  }
 198
 199 #define REG_ALLOC_ORDER {                       \
 200     24,25,                                      \
 201     18,19,                                      \
 202     20,21,                                      \
 203     22,23,                                      \
 204     30,31,                                      \
 205     26,27,                                      \
 206     28,29,                                      \
 207     17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,    \
 208     0,1,                                        \
 209     32,33,34,35                                 \
 210     }
 211
 212 #define ADJUST_REG_ALLOC_ORDER avr_adjust_reg_alloc_order()
 213
 214
 215 enum reg_class {
 216   NO_REGS,
 217   R0_REG,                       /* r0 */
 218   POINTER_X_REGS,               /* r26 - r27 */
 219   POINTER_Y_REGS,               /* r28 - r29 */
 220   POINTER_Z_REGS,               /* r30 - r31 */
 221   STACK_REG,                    /* STACK */
 222   BASE_POINTER_REGS,            /* r28 - r31 */
 223   POINTER_REGS,                 /* r26 - r31 */
 224   ADDW_REGS,                    /* r24 - r31 */
 225   SIMPLE_LD_REGS,               /* r16 - r23 */
 226   LD_REGS,                      /* r16 - r31 */
 227   NO_LD_REGS,                   /* r0 - r15 */
 228   GENERAL_REGS,                 /* r0 - r31 */
 229   ALL_REGS, LIM_REG_CLASSES
 230 };
 231
 232
 233 #define N_REG_CLASSES (int)LIM_REG_CLASSES
 234
 235 #define REG_CLASS_NAMES {                                       \
 236                  "NO_REGS",                                     \
 237                    "R0_REG",    /* r0 */                        \
 238                    "POINTER_X_REGS", /* r26 - r27 */            \
 239                    "POINTER_Y_REGS", /* r28 - r29 */            \
 240                    "POINTER_Z_REGS", /* r30 - r31 */            \
 241                    "STACK_REG", /* STACK */                     \
 242                    "BASE_POINTER_REGS", /* r28 - r31 */         \
 243                    "POINTER_REGS", /* r26 - r31 */              \
 244                    "ADDW_REGS", /* r24 - r31 */                 \
 245                    "SIMPLE_LD_REGS", /* r16 - r23 */            \
 246                    "LD_REGS",   /* r16 - r31 */                 \
 247                    "NO_LD_REGS", /* r0 - r15 */                 \
 248                    "GENERAL_REGS", /* r0 - r31 */               \
 249                    "ALL_REGS" }
 250
 251 #define REG_CLASS_CONTENTS {                                            \
 252   {0x00000000,0x00000000},      /* NO_REGS */                           \
 253   {0x00000001,0x00000000},      /* R0_REG */                            \
 254   {3u << REG_X,0x00000000},     /* POINTER_X_REGS, r26 - r27 */         \
 255   {3u << REG_Y,0x00000000},     /* POINTER_Y_REGS, r28 - r29 */         \
 256   {3u << REG_Z,0x00000000},     /* POINTER_Z_REGS, r30 - r31 */         \
 257   {0x00000000,0x00000003},      /* STACK_REG, STACK */                  \
 258   {(3u << REG_Y) | (3u << REG_Z),                                       \
 259      0x00000000},               /* BASE_POINTER_REGS, r28 - r31 */      \
 260   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z),                       \
 261      0x00000000},               /* POINTER_REGS, r26 - r31 */           \
 262   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z) | (3u << REG_W),       \
 263      0x00000000},               /* ADDW_REGS, r24 - r31 */              \
 264   {0x00ff0000,0x00000000},      /* SIMPLE_LD_REGS r16 - r23 */          \
 265   {(3u << REG_X)|(3u << REG_Y)|(3u << REG_Z)|(3u << REG_W)|(0xffu << 16),\
 266      0x00000000},       /* LD_REGS, r16 - r31 */                        \
 267   {0x0000ffff,0x00000000},      /* NO_LD_REGS  r0 - r15 */              \
 268   {0xffffffff,0x00000000},      /* GENERAL_REGS, r0 - r31 */            \
 269   {0xffffffff,0x00000003}       /* ALL_REGS */                          \
 270 }
 271
 272 #define REGNO_REG_CLASS(R) avr_regno_reg_class(R)
 273
 274 #define MODE_CODE_BASE_REG_CLASS(mode, as, outer_code, index_code)   \
 275   avr_mode_code_base_reg_class (mode, as, outer_code, index_code)
 276
 277 #define INDEX_REG_CLASS NO_REGS
 278
 279 #define REGNO_MODE_CODE_OK_FOR_BASE_P(num, mode, as, outer_code, index_code) \
 280   avr_regno_mode_code_ok_for_base_p (num, mode, as, outer_code, index_code)
 281
 282 #define REGNO_OK_FOR_INDEX_P(NUM) 0
 283
 284 #define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true
 285
 286 #define STACK_PUSH_CODE POST_DEC
 287
 288 #define STACK_GROWS_DOWNWARD 1
 289
 290 #define STACK_POINTER_OFFSET 1
 291
 292 #define FIRST_PARM_OFFSET(FUNDECL) 0
 293
 294 #define STACK_BOUNDARY 8
 295
 296 #define STACK_POINTER_REGNUM 32
 297
 298 #define FRAME_POINTER_REGNUM REG_Y
 299
 300 #define ARG_POINTER_REGNUM 34
 301
 302 #define STATIC_CHAIN_REGNUM ((AVR_TINY) ? 18 :2)
 303
 304 #define ELIMINABLE_REGS {                                       \
 305     { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM },               \
 306     { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM },               \
 307     { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },             \
 308     { FRAME_POINTER_REGNUM + 1, STACK_POINTER_REGNUM + 1 } }
 309
 310 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 311   OFFSET = avr_initial_elimination_offset (FROM, TO)
 312
 313 #define RETURN_ADDR_RTX(count, tem) avr_return_addr_rtx (count, tem)
 314
 315 /* Don't use Push rounding. expr.c: emit_single_push_insn is broken
 316    for POST_DEC targets (PR27386).  */
 317 /*#define PUSH_ROUNDING(NPUSHED) (NPUSHED)*/
 318
 319 typedef struct avr_args
 320 {
 321   /* # Registers available for passing */
 322   int nregs;
 323
 324   /* Next available register number */
 325   int regno;
 326 } CUMULATIVE_ARGS;
 327
 328 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 329   avr_init_cumulative_args (&(CUM), FNTYPE, LIBNAME, FNDECL)
 330
 331 #define FUNCTION_ARG_REGNO_P(r) avr_function_arg_regno_p(r)
 332
 333 #define DEFAULT_PCC_STRUCT_RETURN 0
 334
 335 #define EPILOGUE_USES(REGNO) avr_epilogue_uses(REGNO)
 336
 337 #define HAVE_POST_INCREMENT 1
 338 #define HAVE_PRE_DECREMENT 1
 339
 340 #define MAX_REGS_PER_ADDRESS 1
 341
 342 #define LEGITIMIZE_RELOAD_ADDRESS(X,MODE,OPNUM,TYPE,IND_L,WIN)          \
 343   do {                                                                  \
 344     rtx new_x = avr_legitimize_reload_address (&(X), MODE, OPNUM, TYPE, \
 345                                                ADDR_TYPE (TYPE),        \
 346                                                IND_L, make_memloc);     \
 347     if (new_x)                                                          \
 348       {                                                                 \
 349         X = new_x;                                                      \
 350         goto WIN;                                                       \
 351       }                                                                 \
 352   } while (0)
 353
 354 /* We increase branch costs after reload in order to keep basic-block
 355    reordering from introducing out-of-line jumps and to prefer fall-through
 356    edges instead.  The default branch costs are 0, mainly because otherwise
 357    do_store_flag might come up with bloated code.  */
 358 #define BRANCH_COST(speed_p, predictable_p)     \
 359   (avr_branch_cost + (reload_completed ? 4 : 0))
 360
 361 #define SLOW_BYTE_ACCESS 0
 362
 363 #define NO_FUNCTION_CSE 1
 364
 365 #define REGISTER_TARGET_PRAGMAS()                                       \
 366   do {                                                                  \
 367     avr_register_target_pragmas();                                      \
 368   } while (0)
 369
 370 #define TEXT_SECTION_ASM_OP "\t.text"
 371
 372 #define DATA_SECTION_ASM_OP "\t.data"
 373
 374 #define BSS_SECTION_ASM_OP "\t.section .bss"
 375
 376 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
 377    There are no shared libraries on this target, and these sections are
 378    placed in the read-only program memory, so they are not writable.  */
 379
 380 #undef CTORS_SECTION_ASM_OP
 381 #define CTORS_SECTION_ASM_OP "\t.section .ctors,\"a\",@progbits"
 382
 383 #undef DTORS_SECTION_ASM_OP
 384 #define DTORS_SECTION_ASM_OP "\t.section .dtors,\"a\",@progbits"
 385
 386 #define TARGET_ASM_CONSTRUCTOR avr_asm_out_ctor
 387
 388 #define TARGET_ASM_DESTRUCTOR avr_asm_out_dtor
 389
 390 #define SUPPORTS_INIT_PRIORITY 0
 391
 392 /* We pretend jump tables are in text section because otherwise,
 393    final.c will switch to .rodata before jump tables and thereby
 394    triggers __do_copy_data.  As we implement ASM_OUTPUT_ADDR_VEC,
 395    we still have full control over the jump tables themselves.  */
 396 #define JUMP_TABLES_IN_TEXT_SECTION 1
 397
 398 #define ASM_COMMENT_START " ; "
 399
 400 #define ASM_APP_ON "/* #APP */\n"
 401
 402 #define ASM_APP_OFF "/* #NOAPP */\n"
 403
 404 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) ((C) == '\n' || ((C) == '$'))
 405
 406 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(STREAM, DECL, NAME, SIZE, ALIGN) \
 407   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, false)
 408
 409 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 410   avr_asm_asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN, \
 411                                   asm_output_aligned_bss)
 412
 413 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(STREAM, DECL, NAME, SIZE, ALIGN)  \
 414   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, true)
 415
 416 /* Globalizing directive for a label.  */
 417 #define GLOBAL_ASM_OP ".global\t"
 418
 419 #define SUPPORTS_WEAK 1
 420
 421 #define HAS_INIT_SECTION 1
 422
 423 #define REGISTER_NAMES {                                \
 424   "r0","r1","r2","r3","r4","r5","r6","r7",              \
 425     "r8","r9","r10","r11","r12","r13","r14","r15",      \
 426     "r16","r17","r18","r19","r20","r21","r22","r23",    \
 427     "r24","r25","r26","r27","r28","r29","r30","r31",    \
 428     "__SP_L__","__SP_H__","argL","argH"}
 429
 430 #define FINAL_PRESCAN_INSN(insn, operand, nop)  \
 431   avr_final_prescan_insn (insn, operand,nop)
 432
 433 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO)      \
 434 {                                               \
 435   gcc_assert (REGNO < 32);                      \
 436   fprintf (STREAM, "\tpush\tr%d", REGNO);       \
 437 }
 438
 439 #define ASM_OUTPUT_REG_POP(STREAM, REGNO)       \
 440 {                                               \
 441   gcc_assert (REGNO < 32);                      \
 442   fprintf (STREAM, "\tpop\tr%d", REGNO);        \
 443 }
 444
 445 #define ASM_OUTPUT_ADDR_VEC(TLABEL, TDATA)      \
 446   avr_output_addr_vec (TLABEL, TDATA)
 447
 448 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 449   do {                                                  \
 450     if ((POWER) > 0)                                    \
 451       fprintf (STREAM, "\t.p2align\t%d\n", POWER);      \
 452   } while (0)
 453
 454 #define CASE_VECTOR_MODE HImode
 455
 456 #undef WORD_REGISTER_OPERATIONS
 457
 458 /* Can move only a single byte from memory to reg in a
 459    single instruction. */
 460
 461 #define MOVE_MAX 1
 462
 463 /* Allow upto two bytes moves to occur using by_pieces
 464    infrastructure */
 465
 466 #define MOVE_MAX_PIECES 2
 467
 468 /* Set MOVE_RATIO to 3 to allow memory moves upto 4 bytes to happen
 469    by pieces when optimizing for speed, like it did when MOVE_MAX_PIECES
 470    was 4. When optimizing for size, allow memory moves upto 2 bytes.
 471    Also see avr_use_by_pieces_infrastructure_p. */
 472
 473 #define MOVE_RATIO(speed) ((speed) ? 3 : 2)
 474
 475 #define Pmode HImode
 476
 477 #define FUNCTION_MODE HImode
 478
 479 #define DOLLARS_IN_IDENTIFIERS 0
 480
 481 #define TRAMPOLINE_SIZE 4
 482
 483 /* Store in cc_status the expressions
 484    that the condition codes will describe
 485    after execution of an instruction whose pattern is EXP.
 486    Do not alter them if the instruction would not alter the cc's.  */
 487
 488 #define NOTICE_UPDATE_CC(EXP, INSN) avr_notice_update_cc (EXP, INSN)
 489
 490 /* The add insns don't set overflow in a usable way.  */
 491 #define CC_OVERFLOW_UNUSABLE 01000
 492 /* The mov,and,or,xor insns don't set carry.  That's ok though as the
 493    Z bit is all we need when doing unsigned comparisons on the result of
 494    these insns (since they're always with 0).  However, conditions.h has
 495    CC_NO_OVERFLOW defined for this purpose.  Rename it to something more
 496    understandable.  */
 497 #define CC_NO_CARRY CC_NO_OVERFLOW
 498
 499
 500 /* Output assembler code to FILE to increment profiler label # LABELNO
 501    for profiling a function entry.  */
 502
 503 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 504   fprintf (FILE, "/* profiler %d */", (LABELNO))
 505
 506 #define ADJUST_INSN_LENGTH(INSN, LENGTH)                \
 507     (LENGTH = avr_adjust_insn_length (INSN, LENGTH))
 508
 509 extern const char *avr_devicespecs_file (int, const char**);
 510
 511 #define EXTRA_SPEC_FUNCTIONS                                   \
 512   { "device-specs-file", avr_devicespecs_file },
 513
 514 /* Driver self specs has lmited functionality w.r.t. '%s' for dynamic specs.
 515    Apply '%s' to a static string to inflate the file (directory) name which
 516    is used to diagnose problems with reading the specs file.  */
 517
 518 #undef  DRIVER_SELF_SPECS
 519 #define DRIVER_SELF_SPECS                       \
 520   " %:device-specs-file(device-specs%s %{mmcu=*:%*})"
 521
 522 /* No libstdc++ for now.  Empty string doesn't work.  */
 523 #define LIBSTDCXX "gcc"
 524
 525 /* This is the default without any -mmcu=* option.  */
 526 #define MULTILIB_DEFAULTS { "mmcu=" AVR_MMCU_DEFAULT }
 527
 528 #define TEST_HARD_REG_CLASS(CLASS, REGNO) \
 529   TEST_HARD_REG_BIT (reg_class_contents[ (int) (CLASS)], REGNO)
 530
 531 #define CR_TAB "\n\t"
 532
 533 #define DWARF2_ADDR_SIZE 4
 534
 535 #define INCOMING_RETURN_ADDR_RTX   avr_incoming_return_addr_rtx ()
 536 #define INCOMING_FRAME_SP_OFFSET   (AVR_3_BYTE_PC ? 3 : 2)
 537
 538 /* The caller's stack pointer value immediately before the call
 539    is one byte below the first argument.  */
 540 #define ARG_POINTER_CFA_OFFSET(FNDECL)  -1
 541
 542 #define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
 543   avr_hard_regno_rename_ok (OLD_REG, NEW_REG)
 544
 545 /* A C structure for machine-specific, per-function data.
 546    This is added to the cfun structure.  */
 547 struct GTY(()) machine_function
 548 {
 549   /* 'true' - if current function is a naked function.  */
 550   int is_naked;
 551
 552   /* 'true' - if current function is an interrupt function
 553      as specified by the "interrupt" attribute.  */
 554   int is_interrupt;
 555
 556   /* 'true' - if current function is a signal function
 557      as specified by the "signal" attribute.  */
 558   int is_signal;
 559
 560   /* 'true' - if current function is a 'task' function
 561      as specified by the "OS_task" attribute.  */
 562   int is_OS_task;
 563
 564   /* 'true' - if current function is a 'main' function
 565      as specified by the "OS_main" attribute.  */
 566   int is_OS_main;
 567
 568   /* Current function stack size.  */
 569   int stack_usage;
 570
 571   /* 'true' if a callee might be tail called */
 572   int sibcall_fails;
 573
 574   /* 'true' if the above is_foo predicates are sanity-checked to avoid
 575      multiple diagnose for the same function.  */
 576   int attributes_checked_p;
 577
 578   /* 'true' - if current function shall not use '__gcc_isr' pseudo
 579      instructions as specified by the "no_gccisr" attribute.  */
 580   int is_no_gccisr;
 581
 582   /* Used for `__gcc_isr' pseudo instruction handling of
 583      non-naked ISR prologue / epilogue(s).  */
 584   struct
 585   {
 586     /* 'true' if this function actually uses "*gasisr" insns. */
 587     int yes;
 588     /* 'true' if this function is allowed to use "*gasisr" insns. */
 589     int maybe;
 590     /* The register numer as printed by the Done chunk.  */
 591     int regno;
 592   } gasisr;
 593
 594   /* 'true' if this function references .L__stack_usage like with
 595      __builtin_return_address.  */
 596   int use_L__stack_usage;
 597 };
 598
 599 /* AVR does not round pushes, but the existence of this macro is
 600    required in order for pushes to be generated.  */
 601 #define PUSH_ROUNDING(X)        (X)
 602
 603 /* Define prototype here to avoid build warning.  Some files using
 604    ACCUMULATE_OUTGOING_ARGS (directly or indirectly) include
 605    tm.h but not tm_p.h.  */
 606 extern int avr_accumulate_outgoing_args (void);
 607 #define ACCUMULATE_OUTGOING_ARGS avr_accumulate_outgoing_args()
 608
 609 #define INIT_EXPANDERS avr_init_expanders()
 610
 611 /* Flags used for io and address attributes.  */
 612 #define SYMBOL_FLAG_IO_LOW      (SYMBOL_FLAG_MACH_DEP << 4)
 613 #define SYMBOL_FLAG_IO          (SYMBOL_FLAG_MACH_DEP << 5)
 614 #define SYMBOL_FLAG_ADDRESS     (SYMBOL_FLAG_MACH_DEP << 6)