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, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   4    2008, 2009, 2010, 2011
   5    Free Software Foundation, Inc.
   6    Contributed by Denis Chertykov (chertykov@gmail.com)
   7
   8 This file is part of GCC.
   9
  10 GCC is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 3, or (at your option)
  13 any later version.
  14
  15 GCC is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GCC; see the file COPYING3.  If not see
  22 <http://www.gnu.org/licenses/>.  */
  23
  24 /* Names to predefine in the preprocessor for this target machine.  */
  25
  26 struct base_arch_s {
  27   /* Assembler only.  */
  28   int asm_only;
  29
  30   /* Core have 'MUL*' instructions.  */
  31   int have_mul;
  32
  33   /* Core have 'CALL' and 'JMP' instructions.  */
  34   int have_jmp_call;
  35
  36   /* Core have 'MOVW' and 'LPM Rx,Z' instructions.  */
  37   int have_movw_lpmx;
  38
  39   /* Core have 'ELPM' instructions.  */
  40   int have_elpm;
  41
  42   /* Core have 'ELPM Rx,Z' instructions.  */
  43   int have_elpmx;
  44
  45   /* Core have 'EICALL' and 'EIJMP' instructions.  */
  46   int have_eijmp_eicall;
  47
  48   /* Reserved for xmega architecture.  */
  49   int reserved;
  50
  51   /* Reserved for xmega architecture.  */
  52   int reserved2;
  53
  54   /* Default start of data section address for architecture.  */
  55   int default_data_section_start;
  56
  57   const char *const macro;
  58
  59   /* Architecture name.  */
  60   const char *const arch_name;
  61 };
  62
  63 /* These names are used as the index into the avr_arch_types[] table
  64    above.  */
  65
  66 enum avr_arch
  67 {
  68   ARCH_UNKNOWN,
  69   ARCH_AVR1,
  70   ARCH_AVR2,
  71   ARCH_AVR25,
  72   ARCH_AVR3,
  73   ARCH_AVR31,
  74   ARCH_AVR35,
  75   ARCH_AVR4,
  76   ARCH_AVR5,
  77   ARCH_AVR51,
  78   ARCH_AVR6
  79 };
  80
  81 struct mcu_type_s {
  82   /* Device name.  */
  83   const char *const name;
  84
  85   /* Index in avr_arch_types[].  */
  86   int arch;
  87
  88   /* Must lie outside user's namespace.  NULL == no macro.  */
  89   const char *const macro;
  90
  91   /* Stack pointer have 8 bits width.  */
  92   int short_sp;
  93
  94   /* Start of data section.  */
  95   int data_section_start;
  96
  97   /* Name of device library.  */
  98   const char *const library_name;
  99 };
 100
 101 /* Preprocessor macros to define depending on MCU type.  */
 102 extern const char *avr_extra_arch_macro;
 103 extern const struct base_arch_s *avr_current_arch;
 104 extern const struct mcu_type_s *avr_current_device;
 105 extern const struct mcu_type_s avr_mcu_types[];
 106 extern const struct base_arch_s avr_arch_types[];
 107
 108 #define TARGET_CPU_CPP_BUILTINS()       avr_cpu_cpp_builtins (pfile)
 109
 110 #if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS)
 111 extern GTY(()) section *progmem_section;
 112 #endif
 113
 114 #define AVR_HAVE_JMP_CALL (avr_current_arch->have_jmp_call && !TARGET_SHORT_CALLS)
 115 #define AVR_HAVE_MUL (avr_current_arch->have_mul)
 116 #define AVR_HAVE_MOVW (avr_current_arch->have_movw_lpmx)
 117 #define AVR_HAVE_LPMX (avr_current_arch->have_movw_lpmx)
 118 #define AVR_HAVE_RAMPZ (avr_current_arch->have_elpm)
 119 #define AVR_HAVE_EIJMP_EICALL (avr_current_arch->have_eijmp_eicall)
 120 #define AVR_HAVE_8BIT_SP (avr_current_device->short_sp || TARGET_TINY_STACK)
 121
 122 #define AVR_2_BYTE_PC (!AVR_HAVE_EIJMP_EICALL)
 123 #define AVR_3_BYTE_PC (AVR_HAVE_EIJMP_EICALL)
 124
 125 #define TARGET_VERSION fprintf (stderr, " (GNU assembler syntax)");
 126
 127 #define BITS_BIG_ENDIAN 0
 128 #define BYTES_BIG_ENDIAN 0
 129 #define WORDS_BIG_ENDIAN 0
 130
 131 #ifdef IN_LIBGCC2
 132 /* This is to get correct SI and DI modes in libgcc2.c (32 and 64 bits).  */
 133 #define UNITS_PER_WORD 4
 134 #else
 135 /* Width of a word, in units (bytes).  */
 136 #define UNITS_PER_WORD 1
 137 #endif
 138
 139 #define POINTER_SIZE 16
 140
 141
 142 /* Maximum sized of reasonable data type
 143    DImode or Dfmode ...  */
 144 #define MAX_FIXED_MODE_SIZE 32
 145
 146 #define PARM_BOUNDARY 8
 147
 148 #define FUNCTION_BOUNDARY 8
 149
 150 #define EMPTY_FIELD_BOUNDARY 8
 151
 152 /* No data type wants to be aligned rounder than this.  */
 153 #define BIGGEST_ALIGNMENT 8
 154
 155 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 156
 157 #define TARGET_VTABLE_ENTRY_ALIGN 8
 158
 159 #define STRICT_ALIGNMENT 0
 160
 161 #define INT_TYPE_SIZE (TARGET_INT8 ? 8 : 16)
 162 #define SHORT_TYPE_SIZE (INT_TYPE_SIZE == 8 ? INT_TYPE_SIZE : 16)
 163 #define LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 16 : 32)
 164 #define LONG_LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 32 : 64)
 165 #define FLOAT_TYPE_SIZE 32
 166 #define DOUBLE_TYPE_SIZE 32
 167 #define LONG_DOUBLE_TYPE_SIZE 32
 168
 169 #define DEFAULT_SIGNED_CHAR 1
 170
 171 #define SIZE_TYPE (INT_TYPE_SIZE == 8 ? "long unsigned int" : "unsigned int")
 172 #define PTRDIFF_TYPE (INT_TYPE_SIZE == 8 ? "long int" :"int")
 173
 174 #define WCHAR_TYPE_SIZE 16
 175
 176 #define FIRST_PSEUDO_REGISTER 36
 177
 178 #define FIXED_REGISTERS {\
 179   1,1,/* r0 r1 */\
 180   0,0,/* r2 r3 */\
 181   0,0,/* r4 r5 */\
 182   0,0,/* r6 r7 */\
 183   0,0,/* r8 r9 */\
 184   0,0,/* r10 r11 */\
 185   0,0,/* r12 r13 */\
 186   0,0,/* r14 r15 */\
 187   0,0,/* r16 r17 */\
 188   0,0,/* r18 r19 */\
 189   0,0,/* r20 r21 */\
 190   0,0,/* r22 r23 */\
 191   0,0,/* r24 r25 */\
 192   0,0,/* r26 r27 */\
 193   0,0,/* r28 r29 */\
 194   0,0,/* r30 r31 */\
 195   1,1,/*  STACK */\
 196   1,1 /* arg pointer */  }
 197
 198 #define CALL_USED_REGISTERS {                   \
 199   1,1,/* r0 r1 */                               \
 200     0,0,/* r2 r3 */                             \
 201     0,0,/* r4 r5 */                             \
 202     0,0,/* r6 r7 */                             \
 203     0,0,/* r8 r9 */                             \
 204     0,0,/* r10 r11 */                           \
 205     0,0,/* r12 r13 */                           \
 206     0,0,/* r14 r15 */                           \
 207     0,0,/* r16 r17 */                           \
 208     1,1,/* r18 r19 */                           \
 209     1,1,/* r20 r21 */                           \
 210     1,1,/* r22 r23 */                           \
 211     1,1,/* r24 r25 */                           \
 212     1,1,/* r26 r27 */                           \
 213     0,0,/* r28 r29 */                           \
 214     1,1,/* r30 r31 */                           \
 215     1,1,/*  STACK */                            \
 216     1,1 /* arg pointer */  }
 217
 218 #define REG_ALLOC_ORDER {                       \
 219     24,25,                                      \
 220     18,19,                                      \
 221     20,21,                                      \
 222     22,23,                                      \
 223     30,31,                                      \
 224     26,27,                                      \
 225     28,29,                                      \
 226     17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,    \
 227     0,1,                                        \
 228     32,33,34,35                                 \
 229     }
 230
 231 #define ADJUST_REG_ALLOC_ORDER order_regs_for_local_alloc ()
 232
 233
 234 #define HARD_REGNO_NREGS(REGNO, MODE) ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 235
 236 #define HARD_REGNO_MODE_OK(REGNO, MODE) avr_hard_regno_mode_ok(REGNO, MODE)
 237
 238 #define MODES_TIEABLE_P(MODE1, MODE2) 1
 239
 240 enum reg_class {
 241   NO_REGS,
 242   R0_REG,                       /* r0 */
 243   POINTER_X_REGS,               /* r26 - r27 */
 244   POINTER_Y_REGS,               /* r28 - r29 */
 245   POINTER_Z_REGS,               /* r30 - r31 */
 246   STACK_REG,                    /* STACK */
 247   BASE_POINTER_REGS,            /* r28 - r31 */
 248   POINTER_REGS,                 /* r26 - r31 */
 249   ADDW_REGS,                    /* r24 - r31 */
 250   SIMPLE_LD_REGS,               /* r16 - r23 */
 251   LD_REGS,                      /* r16 - r31 */
 252   NO_LD_REGS,                   /* r0 - r15 */
 253   GENERAL_REGS,                 /* r0 - r31 */
 254   ALL_REGS, LIM_REG_CLASSES
 255 };
 256
 257
 258 #define N_REG_CLASSES (int)LIM_REG_CLASSES
 259
 260 #define REG_CLASS_NAMES {                                       \
 261                  "NO_REGS",                                     \
 262                    "R0_REG",    /* r0 */                        \
 263                    "POINTER_X_REGS", /* r26 - r27 */            \
 264                    "POINTER_Y_REGS", /* r28 - r29 */            \
 265                    "POINTER_Z_REGS", /* r30 - r31 */            \
 266                    "STACK_REG", /* STACK */                     \
 267                    "BASE_POINTER_REGS", /* r28 - r31 */         \
 268                    "POINTER_REGS", /* r26 - r31 */              \
 269                    "ADDW_REGS", /* r24 - r31 */                 \
 270                    "SIMPLE_LD_REGS", /* r16 - r23 */            \
 271                    "LD_REGS",   /* r16 - r31 */                 \
 272                    "NO_LD_REGS", /* r0 - r15 */                 \
 273                    "GENERAL_REGS", /* r0 - r31 */               \
 274                    "ALL_REGS" }
 275
 276 #define REG_CLASS_CONTENTS {                                            \
 277   {0x00000000,0x00000000},      /* NO_REGS */                           \
 278   {0x00000001,0x00000000},      /* R0_REG */                            \
 279   {3 << REG_X,0x00000000},      /* POINTER_X_REGS, r26 - r27 */         \
 280   {3 << REG_Y,0x00000000},      /* POINTER_Y_REGS, r28 - r29 */         \
 281   {3 << REG_Z,0x00000000},      /* POINTER_Z_REGS, r30 - r31 */         \
 282   {0x00000000,0x00000003},      /* STACK_REG, STACK */                  \
 283   {(3 << REG_Y) | (3 << REG_Z),                                         \
 284      0x00000000},               /* BASE_POINTER_REGS, r28 - r31 */      \
 285   {(3 << REG_X) | (3 << REG_Y) | (3 << REG_Z),                          \
 286      0x00000000},               /* POINTER_REGS, r26 - r31 */           \
 287   {(3 << REG_X) | (3 << REG_Y) | (3 << REG_Z) | (3 << REG_W),           \
 288      0x00000000},               /* ADDW_REGS, r24 - r31 */              \
 289   {0x00ff0000,0x00000000},      /* SIMPLE_LD_REGS r16 - r23 */          \
 290   {(3 << REG_X)|(3 << REG_Y)|(3 << REG_Z)|(3 << REG_W)|(0xff << 16),    \
 291      0x00000000},       /* LD_REGS, r16 - r31 */                        \
 292   {0x0000ffff,0x00000000},      /* NO_LD_REGS  r0 - r15 */              \
 293   {0xffffffff,0x00000000},      /* GENERAL_REGS, r0 - r31 */            \
 294   {0xffffffff,0x00000003}       /* ALL_REGS */                          \
 295 }
 296
 297 #define REGNO_REG_CLASS(R) avr_regno_reg_class(R)
 298
 299 /* The following macro defines cover classes for Integrated Register
 300    Allocator.  Cover classes is a set of non-intersected register
 301    classes covering all hard registers used for register allocation
 302    purpose.  Any move between two registers of a cover class should be
 303    cheaper than load or store of the registers.  The macro value is
 304    array of register classes with LIM_REG_CLASSES used as the end
 305    marker.  */
 306
 307 #define IRA_COVER_CLASSES               \
 308 {                                       \
 309   GENERAL_REGS, LIM_REG_CLASSES         \
 310 }
 311
 312 #define BASE_REG_CLASS (reload_completed ? BASE_POINTER_REGS : POINTER_REGS)
 313
 314 #define INDEX_REG_CLASS NO_REGS
 315
 316 #define REGNO_OK_FOR_BASE_P(r) (((r) < FIRST_PSEUDO_REGISTER            \
 317                                  && ((r) == REG_X                       \
 318                                      || (r) == REG_Y                    \
 319                                      || (r) == REG_Z                    \
 320                                      || (r) == ARG_POINTER_REGNUM))     \
 321                                 || (reg_renumber                        \
 322                                     && (reg_renumber[r] == REG_X        \
 323                                         || reg_renumber[r] == REG_Y     \
 324                                         || reg_renumber[r] == REG_Z     \
 325                                         || (reg_renumber[r]             \
 326                                             == ARG_POINTER_REGNUM))))
 327
 328 #define REGNO_OK_FOR_INDEX_P(NUM) 0
 329
 330 #define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true
 331
 332 #define CLASS_MAX_NREGS(CLASS, MODE)   class_max_nregs (CLASS, MODE)
 333
 334 #define STACK_PUSH_CODE POST_DEC
 335
 336 #define STACK_GROWS_DOWNWARD
 337
 338 #define STARTING_FRAME_OFFSET 1
 339
 340 #define STACK_POINTER_OFFSET 1
 341
 342 #define FIRST_PARM_OFFSET(FUNDECL) 0
 343
 344 #define STACK_BOUNDARY 8
 345
 346 #define STACK_POINTER_REGNUM 32
 347
 348 #define FRAME_POINTER_REGNUM REG_Y
 349
 350 #define ARG_POINTER_REGNUM 34
 351
 352 #define STATIC_CHAIN_REGNUM 2
 353
 354 #define ELIMINABLE_REGS {                                       \
 355       {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},               \
 356         {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}            \
 357        ,{FRAME_POINTER_REGNUM+1,STACK_POINTER_REGNUM+1}}
 358
 359 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 360   OFFSET = avr_initial_elimination_offset (FROM, TO)
 361
 362 #define RETURN_ADDR_RTX(count, tem) avr_return_addr_rtx (count, tem)
 363
 364 /* Don't use Push rounding. expr.c: emit_single_push_insn is broken
 365    for POST_DEC targets (PR27386).  */
 366 /*#define PUSH_ROUNDING(NPUSHED) (NPUSHED)*/
 367
 368 typedef struct avr_args {
 369   int nregs;                    /* # registers available for passing */
 370   int regno;                    /* next available register number */
 371 } CUMULATIVE_ARGS;
 372
 373 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 374   init_cumulative_args (&(CUM), FNTYPE, LIBNAME, FNDECL)
 375
 376 #define FUNCTION_ARG_REGNO_P(r) function_arg_regno_p(r)
 377
 378 extern int avr_reg_order[];
 379
 380 #define DEFAULT_PCC_STRUCT_RETURN 0
 381
 382 #define EPILOGUE_USES(REGNO) avr_epilogue_uses(REGNO)
 383
 384 #define HAVE_POST_INCREMENT 1
 385 #define HAVE_PRE_DECREMENT 1
 386
 387 #define MAX_REGS_PER_ADDRESS 1
 388
 389 #define REG_OK_FOR_BASE_NOSTRICT_P(X) \
 390   (REGNO (X) >= FIRST_PSEUDO_REGISTER || REG_OK_FOR_BASE_STRICT_P(X))
 391
 392 #define REG_OK_FOR_BASE_STRICT_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
 393
 394 /* LEGITIMIZE_RELOAD_ADDRESS will allow register R26/27 to be used, where it
 395    is no worse than normal base pointers R28/29 and R30/31. For example:
 396    If base offset is greater than 63 bytes or for R++ or --R addressing.  */
 397
 398 #define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, IND_LEVELS, WIN)    \
 399 do {                                                                        \
 400   if (1&&(GET_CODE (X) == POST_INC || GET_CODE (X) == PRE_DEC))     \
 401     {                                                                       \
 402       push_reload (XEXP (X,0), XEXP (X,0), &XEXP (X,0), &XEXP (X,0),        \
 403                    POINTER_REGS, GET_MODE (X),GET_MODE (X) , 0, 0,          \
 404                    OPNUM, RELOAD_OTHER);                                    \
 405       goto WIN;                                                             \
 406     }                                                                       \
 407   if (GET_CODE (X) == PLUS                                                  \
 408       && REG_P (XEXP (X, 0))                                                \
 409       && reg_equiv_constant[REGNO (XEXP (X, 0))] == 0                       \
 410       && GET_CODE (XEXP (X, 1)) == CONST_INT                                \
 411       && INTVAL (XEXP (X, 1)) >= 1)                                         \
 412     {                                                                       \
 413       int fit = INTVAL (XEXP (X, 1)) <= (64 - GET_MODE_SIZE (MODE));        \
 414       if (fit)                                                              \
 415         {                                                                   \
 416           if (reg_equiv_address[REGNO (XEXP (X, 0))] != 0)                  \
 417             {                                                               \
 418               int regno = REGNO (XEXP (X, 0));                              \
 419               rtx mem = make_memloc (X, regno);                             \
 420               push_reload (XEXP (mem,0), NULL, &XEXP (mem,0), NULL,         \
 421                            POINTER_REGS, Pmode, VOIDmode, 0, 0,             \
 422                            1, ADDR_TYPE (TYPE));                            \
 423               push_reload (mem, NULL_RTX, &XEXP (X, 0), NULL,               \
 424                            BASE_POINTER_REGS, GET_MODE (X), VOIDmode, 0, 0, \
 425                            OPNUM, TYPE);                                    \
 426               goto WIN;                                                     \
 427             }                                                               \
 428         }                                                                   \
 429       else if (! (frame_pointer_needed && XEXP (X,0) == frame_pointer_rtx)) \
 430         {                                                                   \
 431           push_reload (X, NULL_RTX, &X, NULL,                               \
 432                        POINTER_REGS, GET_MODE (X), VOIDmode, 0, 0,          \
 433                        OPNUM, TYPE);                                        \
 434           goto WIN;                                                         \
 435         }                                                                   \
 436     }                                                                       \
 437 } while(0)
 438
 439 #define LEGITIMATE_CONSTANT_P(X) 1
 440
 441 #define BRANCH_COST(speed_p, predictable_p) 0
 442
 443 #define SLOW_BYTE_ACCESS 0
 444
 445 #define NO_FUNCTION_CSE
 446
 447 #define TEXT_SECTION_ASM_OP "\t.text"
 448
 449 #define DATA_SECTION_ASM_OP "\t.data"
 450
 451 #define BSS_SECTION_ASM_OP "\t.section .bss"
 452
 453 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
 454    There are no shared libraries on this target, and these sections are
 455    placed in the read-only program memory, so they are not writable.  */
 456
 457 #undef CTORS_SECTION_ASM_OP
 458 #define CTORS_SECTION_ASM_OP "\t.section .ctors,\"a\",@progbits"
 459
 460 #undef DTORS_SECTION_ASM_OP
 461 #define DTORS_SECTION_ASM_OP "\t.section .dtors,\"a\",@progbits"
 462
 463 #define TARGET_ASM_CONSTRUCTOR avr_asm_out_ctor
 464
 465 #define TARGET_ASM_DESTRUCTOR avr_asm_out_dtor
 466
 467 #define SUPPORTS_INIT_PRIORITY 0
 468
 469 #define JUMP_TABLES_IN_TEXT_SECTION 0
 470
 471 #define ASM_COMMENT_START " ; "
 472
 473 #define ASM_APP_ON "/* #APP */\n"
 474
 475 #define ASM_APP_OFF "/* #NOAPP */\n"
 476
 477 /* Switch into a generic section.  */
 478 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
 479 #define TARGET_ASM_INIT_SECTIONS avr_asm_init_sections
 480
 481 #define ASM_OUTPUT_ASCII(FILE, P, SIZE)  gas_output_ascii (FILE,P,SIZE)
 482
 483 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) ((C) == '\n' || ((C) == '$'))
 484
 485 #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED)                     \
 486 do {                                                                       \
 487      fputs ("\t.comm ", (STREAM));                                         \
 488      assemble_name ((STREAM), (NAME));                                     \
 489      fprintf ((STREAM), ",%lu,1\n", (unsigned long)(SIZE));                \
 490 } while (0)
 491
 492 #define ASM_OUTPUT_BSS(FILE, DECL, NAME, SIZE, ROUNDED)                 \
 493   asm_output_bss ((FILE), (DECL), (NAME), (SIZE), (ROUNDED))
 494
 495 #define ASM_OUTPUT_LOCAL(STREAM, NAME, SIZE, ROUNDED)                   \
 496 do {                                                                    \
 497      fputs ("\t.lcomm ", (STREAM));                                     \
 498      assemble_name ((STREAM), (NAME));                                  \
 499      fprintf ((STREAM), ",%d\n", (int)(SIZE));                          \
 500 } while (0)
 501
 502 #undef TYPE_ASM_OP
 503 #undef SIZE_ASM_OP
 504 #undef WEAK_ASM_OP
 505 #define TYPE_ASM_OP     "\t.type\t"
 506 #define SIZE_ASM_OP     "\t.size\t"
 507 #define WEAK_ASM_OP     "\t.weak\t"
 508 /* Define the strings used for the special svr4 .type and .size directives.
 509    These strings generally do not vary from one system running svr4 to
 510    another, but if a given system (e.g. m88k running svr) needs to use
 511    different pseudo-op names for these, they may be overridden in the
 512    file which includes this one.  */
 513
 514
 515 #undef TYPE_OPERAND_FMT
 516 #define TYPE_OPERAND_FMT        "@%s"
 517 /* The following macro defines the format used to output the second
 518    operand of the .type assembler directive.  Different svr4 assemblers
 519    expect various different forms for this operand.  The one given here
 520    is just a default.  You may need to override it in your machine-
 521    specific tm.h file (depending upon the particulars of your assembler).  */
 522
 523 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 524 avr_asm_declare_function_name ((FILE), (NAME), (DECL))
 525
 526 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 527   do {                                                                  \
 528     if (!flag_inhibit_size_directive)                                   \
 529       ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                           \
 530   } while (0)
 531
 532 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 533 do {                                                                    \
 534   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                     \
 535   size_directive_output = 0;                                            \
 536   if (!flag_inhibit_size_directive && DECL_SIZE (DECL))                 \
 537     {                                                                   \
 538       size_directive_output = 1;                                        \
 539       ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME,                            \
 540                                  int_size_in_bytes (TREE_TYPE (DECL))); \
 541     }                                                                   \
 542   ASM_OUTPUT_LABEL(FILE, NAME);                                         \
 543 } while (0)
 544
 545 #undef ASM_FINISH_DECLARE_OBJECT
 546 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)         \
 547 do {                                                                     \
 548      const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);             \
 549      HOST_WIDE_INT size;                                                 \
 550      if (!flag_inhibit_size_directive && DECL_SIZE (DECL)                \
 551          && ! AT_END && TOP_LEVEL                                        \
 552          && DECL_INITIAL (DECL) == error_mark_node                       \
 553          && !size_directive_output)                                      \
 554        {                                                                 \
 555          size_directive_output = 1;                                      \
 556          size = int_size_in_bytes (TREE_TYPE (DECL));                    \
 557          ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);                   \
 558        }                                                                 \
 559    } while (0)
 560
 561
 562 #define ESCAPES \
 563 "\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 564 \0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 565 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
 566 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
 567 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 568 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 569 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 570 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
 571 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
 572    ASM_OUTPUT_LIMITED_STRING macros.  Each byte in the table
 573    corresponds to a particular byte value [0..255].  For any
 574    given byte value, if the value in the corresponding table
 575    position is zero, the given character can be output directly.
 576    If the table value is 1, the byte must be output as a \ooo
 577    octal escape.  If the tables value is anything else, then the
 578    byte value should be output as a \ followed by the value
 579    in the table.  Note that we can use standard UN*X escape
 580    sequences for many control characters, but we don't use
 581    \a to represent BEL because some svr4 assemblers (e.g. on
 582    the i386) don't know about that.  Also, we don't use \v
 583    since some versions of gas, such as 2.2 did not accept it.  */
 584
 585 #define STRING_LIMIT    ((unsigned) 64)
 586 #define STRING_ASM_OP   "\t.string\t"
 587 /* Some svr4 assemblers have a limit on the number of characters which
 588    can appear in the operand of a .string directive.  If your assembler
 589    has such a limitation, you should define STRING_LIMIT to reflect that
 590    limit.  Note that at least some svr4 assemblers have a limit on the
 591    actual number of bytes in the double-quoted string, and that they
 592    count each character in an escape sequence as one byte.  Thus, an
 593    escape sequence like \377 would count as four bytes.
 594
 595    If your target assembler doesn't support the .string directive, you
 596    should define this to zero.  */
 597
 598 /* Globalizing directive for a label.  */
 599 #define GLOBAL_ASM_OP ".global\t"
 600
 601 #define SET_ASM_OP      "\t.set\t"
 602
 603 #define ASM_WEAKEN_LABEL(FILE, NAME)    \
 604   do                                    \
 605     {                                   \
 606       fputs ("\t.weak\t", (FILE));      \
 607       assemble_name ((FILE), (NAME));   \
 608       fputc ('\n', (FILE));             \
 609     }                                   \
 610   while (0)
 611
 612 #define SUPPORTS_WEAK 1
 613
 614 #define ASM_GENERATE_INTERNAL_LABEL(STRING, PREFIX, NUM)        \
 615 sprintf (STRING, "*.%s%lu", PREFIX, (unsigned long)(NUM))
 616
 617 #define HAS_INIT_SECTION 1
 618
 619 #define REGISTER_NAMES {                                \
 620   "r0","r1","r2","r3","r4","r5","r6","r7",              \
 621     "r8","r9","r10","r11","r12","r13","r14","r15",      \
 622     "r16","r17","r18","r19","r20","r21","r22","r23",    \
 623     "r24","r25","r26","r27","r28","r29","r30","r31",    \
 624     "__SP_L__","__SP_H__","argL","argH"}
 625
 626 #define FINAL_PRESCAN_INSN(insn, operand, nop) final_prescan_insn (insn, operand,nop)
 627
 628 #define PRINT_OPERAND(STREAM, X, CODE) print_operand (STREAM, X, CODE)
 629
 630 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) ((CODE) == '~' || (CODE) == '!')
 631
 632 #define PRINT_OPERAND_ADDRESS(STREAM, X) print_operand_address(STREAM, X)
 633
 634 #define USER_LABEL_PREFIX ""
 635
 636 #define ASSEMBLER_DIALECT AVR_HAVE_MOVW
 637
 638 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO)      \
 639 {                                               \
 640   gcc_assert (REGNO < 32);                      \
 641   fprintf (STREAM, "\tpush\tr%d", REGNO);       \
 642 }
 643
 644 #define ASM_OUTPUT_REG_POP(STREAM, REGNO)       \
 645 {                                               \
 646   gcc_assert (REGNO < 32);                      \
 647   fprintf (STREAM, "\tpop\tr%d", REGNO);        \
 648 }
 649
 650 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE)          \
 651   avr_output_addr_vec_elt(STREAM, VALUE)
 652
 653 #define ASM_OUTPUT_CASE_LABEL(STREAM, PREFIX, NUM, TABLE) \
 654   (switch_to_section (progmem_section), \
 655    (*targetm.asm_out.internal_label) (STREAM, PREFIX, NUM))
 656
 657 #define ASM_OUTPUT_SKIP(STREAM, N)              \
 658 fprintf (STREAM, "\t.skip %lu,0\n", (unsigned long)(N))
 659
 660 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 661   do {                                                  \
 662       if ((POWER) > 1)                                  \
 663           fprintf (STREAM, "\t.p2align\t%d\n", POWER);  \
 664   } while (0)
 665
 666 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
 667   default_elf_asm_output_external (FILE, DECL, NAME)
 668
 669 #define CASE_VECTOR_MODE HImode
 670
 671 #undef WORD_REGISTER_OPERATIONS
 672
 673 #define MOVE_MAX 4
 674
 675 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 676
 677 #define Pmode HImode
 678
 679 #define FUNCTION_MODE HImode
 680
 681 #define DOLLARS_IN_IDENTIFIERS 0
 682
 683 #define NO_DOLLAR_IN_LABEL 1
 684
 685 #define TRAMPOLINE_SIZE 4
 686
 687 /* Store in cc_status the expressions
 688    that the condition codes will describe
 689    after execution of an instruction whose pattern is EXP.
 690    Do not alter them if the instruction would not alter the cc's.  */
 691
 692 #define NOTICE_UPDATE_CC(EXP, INSN) notice_update_cc(EXP, INSN)
 693
 694 /* The add insns don't set overflow in a usable way.  */
 695 #define CC_OVERFLOW_UNUSABLE 01000
 696 /* The mov,and,or,xor insns don't set carry.  That's ok though as the
 697    Z bit is all we need when doing unsigned comparisons on the result of
 698    these insns (since they're always with 0).  However, conditions.h has
 699    CC_NO_OVERFLOW defined for this purpose.  Rename it to something more
 700    understandable.  */
 701 #define CC_NO_CARRY CC_NO_OVERFLOW
 702
 703
 704 /* Output assembler code to FILE to increment profiler label # LABELNO
 705    for profiling a function entry.  */
 706
 707 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 708   fprintf (FILE, "/* profiler %d */", (LABELNO))
 709
 710 #define ADJUST_INSN_LENGTH(INSN, LENGTH) (LENGTH =\
 711                                           adjust_insn_length (INSN, LENGTH))
 712
 713 extern const char *avr_device_to_arch (int argc, const char **argv);
 714 extern const char *avr_device_to_data_start (int argc, const char **argv);
 715 extern const char *avr_device_to_startfiles (int argc, const char **argv);
 716 extern const char *avr_device_to_devicelib (int argc, const char **argv);
 717
 718 #define EXTRA_SPEC_FUNCTIONS \
 719   { "device_to_arch", avr_device_to_arch }, \
 720   { "device_to_data_start", avr_device_to_data_start }, \
 721   { "device_to_startfile", avr_device_to_startfiles }, \
 722   { "device_to_devicelib", avr_device_to_devicelib },
 723
 724 #define CPP_SPEC ""
 725
 726 #define CC1_SPEC ""
 727
 728 #define CC1PLUS_SPEC "%{!frtti:-fno-rtti} \
 729     %{!fenforce-eh-specs:-fno-enforce-eh-specs} \
 730     %{!fexceptions:-fno-exceptions}"
 731 /* A C string constant that tells the GCC driver program options to
 732    pass to `cc1plus'.  */
 733
 734 #define ASM_SPEC "%{mmcu=avr25:-mmcu=avr2;mmcu=avr35:-mmcu=avr3;mmcu=avr31:-mmcu=avr3;mmcu=avr51:-mmcu=avr5;\
 735 mmcu=*:-mmcu=%*}"
 736
 737 #define LINK_SPEC "\
 738 %{mrelax:--relax\
 739          %{mpmem-wrap-around:%{mmcu=at90usb8*:--pmem-wrap-around=8k}\
 740                              %{mmcu=atmega16*:--pmem-wrap-around=16k}\
 741                              %{mmcu=atmega32*|\
 742                                mmcu=at90can32*:--pmem-wrap-around=32k}\
 743                              %{mmcu=atmega64*|\
 744                                mmcu=at90can64*|\
 745                                mmcu=at90usb64*:--pmem-wrap-around=64k}}}\
 746 %:device_to_arch(%{mmcu=*:%*})\
 747 %:device_to_data_start(%{mmcu=*:%*})"
 748
 749 #define LIB_SPEC \
 750   "%{!mmcu=at90s1*:%{!mmcu=attiny11:%{!mmcu=attiny12:%{!mmcu=attiny15:%{!mmcu=attiny28: -lc }}}}}"
 751
 752 #define LIBSTDCXX "gcc"
 753 /* No libstdc++ for now.  Empty string doesn't work.  */
 754
 755 #define LIBGCC_SPEC \
 756   "%{!mmcu=at90s1*:%{!mmcu=attiny11:%{!mmcu=attiny12:%{!mmcu=attiny15:%{!mmcu=attiny28: -lgcc }}}}}"
 757
 758 #define STARTFILE_SPEC "%:device_to_startfile(%{mmcu=*:%*})"
 759
 760 #define ENDFILE_SPEC ""
 761
 762 /* This is the default without any -mmcu=* option (AT90S*).  */
 763 #define MULTILIB_DEFAULTS { "mmcu=avr2" }
 764
 765 #define TEST_HARD_REG_CLASS(CLASS, REGNO) \
 766   TEST_HARD_REG_BIT (reg_class_contents[ (int) (CLASS)], REGNO)
 767
 768 /* Note that the other files fail to use these
 769    in some of the places where they should.  */
 770
 771 #if defined(__STDC__) || defined(ALMOST_STDC)
 772 #define AS2(a,b,c) #a " " #b "," #c
 773 #define AS2C(b,c) " " #b "," #c
 774 #define AS3(a,b,c,d) #a " " #b "," #c "," #d
 775 #define AS1(a,b) #a " " #b
 776 #else
 777 #define AS1(a,b) "a     b"
 778 #define AS2(a,b,c) "a   b,c"
 779 #define AS2C(b,c) " b,c"
 780 #define AS3(a,b,c,d) "a b,c,d"
 781 #endif
 782 #define OUT_AS1(a,b) output_asm_insn (AS1(a,b), operands)
 783 #define OUT_AS2(a,b,c) output_asm_insn (AS2(a,b,c), operands)
 784 #define CR_TAB "\n\t"
 785
 786 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 787
 788 #define DWARF2_DEBUGGING_INFO 1
 789
 790 #define DWARF2_ADDR_SIZE 4
 791
 792 #define OBJECT_FORMAT_ELF
 793
 794 #define INCOMING_RETURN_ADDR_RTX   avr_incoming_return_addr_rtx ()
 795 #define INCOMING_FRAME_SP_OFFSET   (AVR_3_BYTE_PC ? 3 : 2)
 796
 797 /* The caller's stack pointer value immediately before the call
 798    is one byte below the first argument.  */
 799 #define ARG_POINTER_CFA_OFFSET(FNDECL)  -1
 800
 801 #define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
 802   avr_hard_regno_rename_ok (OLD_REG, NEW_REG)
 803
 804 /* A C structure for machine-specific, per-function data.
 805    This is added to the cfun structure.  */
 806 struct GTY(()) machine_function
 807 {
 808   /* 'true' - if current function is a naked function.  */
 809   int is_naked;
 810
 811   /* 'true' - if current function is an interrupt function
 812      as specified by the "interrupt" attribute.  */
 813   int is_interrupt;
 814
 815   /* 'true' - if current function is a signal function
 816      as specified by the "signal" attribute.  */
 817   int is_signal;
 818
 819   /* 'true' - if current function is a 'task' function
 820      as specified by the "OS_task" attribute.  */
 821   int is_OS_task;
 822
 823   /* 'true' - if current function is a 'main' function
 824      as specified by the "OS_main" attribute.  */
 825   int is_OS_main;
 826
 827   /* Current function stack size.  */
 828   int stack_usage;
 829
 830   /* 'true' if a callee might be tail called */
 831   int sibcall_fails;
 832 };