gcc/config/msp430/msp430.h

   1 /* GCC backend definitions for the TI MSP430 Processor
   2    Copyright (C) 2012-2015 Free Software Foundation, Inc.
   3    Contributed by Red Hat.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20 \f
  21
  22 /* Run-time Target Specification */
  23
  24 /* True if the MSP430x extensions are enabled.  */
  25 #ifndef IN_LIBGCC2
  26 extern bool msp430x;
  27 #endif
  28
  29 #define TARGET_CPU_CPP_BUILTINS()               \
  30   do                                            \
  31     {                                           \
  32       builtin_define ("NO_TRAMPOLINES");        \
  33       builtin_define ("__MSP430__");            \
  34       builtin_define (msp430_mcu_name ());      \
  35       if (msp430x)                              \
  36         {                                       \
  37           builtin_define ("__MSP430X__");       \
  38           builtin_assert ("cpu=MSP430X");       \
  39           if (TARGET_LARGE)                     \
  40             builtin_define ("__MSP430X_LARGE__");       \
  41         }                                       \
  42       else                                      \
  43         builtin_assert ("cpu=MSP430");          \
  44     }                                           \
  45   while (0)
  46
  47 #undef  STARTFILE_SPEC
  48 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:%{minrt:crt0-minrt.o%s}%{!minrt:crt0.o%s}} %{!minrt:crtbegin.o%s}"
  49
  50 /* -lgcc is included because crtend.o needs __mspabi_func_epilog_1.  */
  51 #undef  ENDFILE_SPEC
  52 #define ENDFILE_SPEC "%{!minrt:crtend.o%s} %{minrt:crtn-minrt.o%s}%{!minrt:crtn.o%s} -lgcc"
  53
  54 #define ASM_SPEC "-mP " /* Enable polymorphic instructions.  */ \
  55   "%{mcpu=*:-mcpu=%*}%{!mcpu=*:%{mmcu=*:-mmcu=%*}} " /* Pass the CPU type on to the assembler.  */ \
  56   "%{mrelax=-mQ} " /* Pass the relax option on to the assembler.  */ \
  57   "%{mlarge:-ml} " /* Tell the assembler if we are building for the LARGE pointer model.  */ \
  58   "%{!msim:-md} %{msim:%{mlarge:-md}} " /* Copy data from ROM to RAM if necessary.  */ \
  59   "%{ffunction-sections:-gdwarf-sections} " /* If function sections are being created then create DWARF line number sections as well.  */
  60
  61 /* Enable linker section garbage collection by default, unless we
  62    are creating a relocatable binary (gc does not work) or debugging
  63    is enabled  (the GDB testsuite relies upon unused entities not being deleted).  */
  64 #define LINK_SPEC "%{mrelax:--relax} %{mlarge:%{!r:%{!g:--gc-sections}}}"
  65
  66 #undef  LIB_SPEC
  67 #define LIB_SPEC "                                      \
  68 --start-group                                           \
  69 -lc                                                     \
  70 -lgcc                                                   \
  71 -lcrt                                                   \
  72 %{msim:-lsim}                                           \
  73 --end-group                                             \
  74 %{!T*:%{!msim:%{mmcu=*:--script=%*.ld}}}                \
  75 %{!T*:%{!msim:%{!mmcu=*:%Tmsp430.ld}}}                  \
  76 %{!T*:%{msim:%{mlarge:%Tmsp430xl-sim.ld}%{!mlarge:%Tmsp430-sim.ld}}} \
  77 "
  78 \f
  79 /* Storage Layout */
  80
  81 #define BITS_BIG_ENDIAN                 0
  82 #define BYTES_BIG_ENDIAN                0
  83 #define WORDS_BIG_ENDIAN                0
  84
  85
  86 #ifdef IN_LIBGCC2
  87 /* This is to get correct SI and DI modes in libgcc2.c (32 and 64 bits).  */
  88 #define UNITS_PER_WORD                  4
  89 /* We have a problem with libgcc2.  It only defines two versions of
  90    each function, one for "int" and one for "long long".  Ie it assumes
  91    that "sizeof (int) == sizeof (long)".  For the MSP430 this is not true
  92    and we need a third set of functions.  We explicitly define
  93    LIBGCC2_UNITS_PER_WORD here so that it is clear that we are expecting
  94    to get the SI and DI versions from the libgcc2.c sources, and we
  95    provide our own set of HI functions, which is why this
  96    definition is surrounded by #ifndef..#endif.  */
  97 #ifndef LIBGCC2_UNITS_PER_WORD
  98 #define LIBGCC2_UNITS_PER_WORD          4
  99 #endif
 100 #else
 101 /* Actual width of a word, in units (bytes).  */
 102 #define UNITS_PER_WORD                  2
 103 #endif
 104
 105 #define SHORT_TYPE_SIZE                 16
 106 #define INT_TYPE_SIZE                   16
 107 #define LONG_TYPE_SIZE                  32
 108 #define LONG_LONG_TYPE_SIZE             64
 109
 110 #define FLOAT_TYPE_SIZE                 32
 111 #define DOUBLE_TYPE_SIZE                64
 112 #define LONG_DOUBLE_TYPE_SIZE           64 /*DOUBLE_TYPE_SIZE*/
 113
 114 #define DEFAULT_SIGNED_CHAR             0
 115
 116 #define STRICT_ALIGNMENT                1
 117 #define FUNCTION_BOUNDARY               16
 118 #define BIGGEST_ALIGNMENT               16
 119 #define STACK_BOUNDARY                  16
 120 #define PARM_BOUNDARY                   8
 121 #define PCC_BITFIELD_TYPE_MATTERS       1
 122
 123 #define STACK_GROWS_DOWNWARD            1
 124 #define FRAME_GROWS_DOWNWARD            1
 125 #define FIRST_PARM_OFFSET(FNDECL)       0
 126
 127 #define MAX_REGS_PER_ADDRESS            1
 128
 129 #define Pmode                           (TARGET_LARGE ? PSImode : HImode)
 130 #define POINTER_SIZE                    (TARGET_LARGE ? 20 : 16)
 131 /* This is just for .eh_frame, to match bfd.  */
 132 #define PTR_SIZE                        (TARGET_LARGE ? 4 : 2)
 133 #define POINTERS_EXTEND_UNSIGNED        1
 134
 135 #define ADDR_SPACE_NEAR 1
 136 #define ADDR_SPACE_FAR  2
 137
 138 #define REGISTER_TARGET_PRAGMAS() msp430_register_pragmas()
 139
 140 #if 1 /* XXX */
 141 /* Define this macro if it is advisable to hold scalars in registers
 142    in a wider mode than that declared by the program.  In such cases,
 143    the value is constrained to be within the bounds of the declared
 144    type, but kept valid in the wider mode.  The signedness of the
 145    extension may differ from that of the type.  */
 146
 147 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)     \
 148   if (GET_MODE_CLASS (MODE) == MODE_INT         \
 149       && GET_MODE_SIZE (MODE) < 2)              \
 150     (MODE) = HImode;
 151 #endif
 152 \f
 153 /* Layout of Source Language Data Types */
 154
 155 #undef  SIZE_TYPE
 156 #define SIZE_TYPE                       (TARGET_LARGE ? "__int20 unsigned" : "unsigned int")
 157 #undef  PTRDIFF_TYPE
 158 #define PTRDIFF_TYPE                    (TARGET_LARGE ? "__int20" : "int")
 159 #undef  WCHAR_TYPE
 160 #define WCHAR_TYPE                      "long int"
 161 #undef  WCHAR_TYPE_SIZE
 162 #define WCHAR_TYPE_SIZE                 BITS_PER_WORD
 163 #define FUNCTION_MODE                   HImode
 164 #define CASE_VECTOR_MODE                Pmode
 165 #define HAS_LONG_COND_BRANCH            0
 166 #define HAS_LONG_UNCOND_BRANCH          0
 167
 168 #define LOAD_EXTEND_OP(M)               ZERO_EXTEND
 169 /*#define WORD_REGISTER_OPERATIONS      1*/
 170
 171 #define MOVE_MAX                        8
 172 #define STARTING_FRAME_OFFSET           0
 173
 174 #define INCOMING_RETURN_ADDR_RTX \
 175   msp430_incoming_return_addr_rtx ()
 176
 177 #define RETURN_ADDR_RTX(COUNT, FA)              \
 178   msp430_return_addr_rtx (COUNT)
 179
 180 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC)   1
 181
 182 #define SLOW_BYTE_ACCESS                0
 183 \f
 184
 185 /* Register Usage */
 186
 187 /* gas doesn't recognize PC (R0), SP (R1), and SR (R2) as register
 188    names.  */
 189 #define REGISTER_NAMES                                          \
 190 {                                                               \
 191   "R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7",               \
 192     "R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15",       \
 193   "argptr"                                                      \
 194 }
 195
 196 enum reg_class
 197 {
 198   NO_REGS,
 199   R12_REGS,
 200   R13_REGS,
 201   GEN_REGS,
 202   ALL_REGS,
 203   LIM_REG_CLASSES
 204 };
 205
 206 #define REG_CLASS_NAMES \
 207 {                       \
 208   "NO_REGS",            \
 209   "R12_REGS",           \
 210   "R13_REGS",           \
 211   "GEN_REGS",           \
 212   "ALL_REGS"            \
 213 }
 214
 215 #define REG_CLASS_CONTENTS \
 216 {                          \
 217   0x00000000,              \
 218   0x00001000,              \
 219   0x00002000,              \
 220   0x0000fff2,              \
 221   0x0001ffff               \
 222 }
 223
 224 #define GENERAL_REGS                    GEN_REGS
 225 #define BASE_REG_CLASS                  GEN_REGS
 226 #define INDEX_REG_CLASS                 GEN_REGS
 227 #define N_REG_CLASSES                   (int) LIM_REG_CLASSES
 228
 229 #define PC_REGNUM                       0
 230 #define STACK_POINTER_REGNUM            1
 231 #define CC_REGNUM                       2
 232 #define FRAME_POINTER_REGNUM            4 /* not usually used, call preserved */
 233 #define ARG_POINTER_REGNUM              16
 234 #define STATIC_CHAIN_REGNUM             5 /* FIXME */
 235
 236 #define FIRST_PSEUDO_REGISTER           17
 237
 238 #define REGNO_REG_CLASS(REGNO)          ((REGNO) < 17 \
 239                                          ? GEN_REGS : NO_REGS)
 240
 241 #define TRAMPOLINE_SIZE                 4 /* FIXME */
 242 #define TRAMPOLINE_ALIGNMENT            16 /* FIXME */
 243
 244 #define ELIMINABLE_REGS                                 \
 245 {{ ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM },        \
 246  { ARG_POINTER_REGNUM,   FRAME_POINTER_REGNUM },        \
 247  { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM }}
 248
 249 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)    \
 250   (OFFSET) = msp430_initial_elimination_offset ((FROM), (TO))
 251
 252
 253 #define FUNCTION_ARG_REGNO_P(N)         ((N) >= 8 && (N) < ARG_POINTER_REGNUM)
 254 #define DEFAULT_PCC_STRUCT_RETURN       0
 255
 256 /* 1 == register can't be used by gcc, in general
 257    0 == register can be used by gcc, in general */
 258 #define FIXED_REGISTERS                                 \
 259 {                                                       \
 260   1,0,1,1, 0,0,0,0,                                     \
 261   0,0,0,0, 0,0,0,0,                                     \
 262   1,                                                    \
 263 }
 264
 265 /* 1 == value changes across function calls
 266    0 == value is the same after a call      */
 267 /* R4 through R10 are callee-saved */
 268 #define CALL_USED_REGISTERS                             \
 269 {                                                       \
 270   1,0,1,1, 0,0,0,0,                                     \
 271   0,0,0,1, 1,1,1,1,                                     \
 272   1,                                            \
 273 }
 274
 275 #define REG_ALLOC_ORDER                                 \
 276   { 12, 13, 14, 15, 10, 9, 8, 7, 6, 5, 4, 11, 0, 1, 2, 3, 16 }
 277 /*  { 11, 15, 14, 13, 12, 10, 9, 8, 7, 6, 5, 4, 0, 1, 2, 3, 16 }*/
 278
 279 #define REGNO_OK_FOR_BASE_P(regno)      1
 280 #define REGNO_OK_FOR_INDEX_P(regno)     1
 281
 282 \f
 283
 284 typedef struct
 285 {
 286   /* These two are the current argument status.  */
 287   char reg_used[4];
 288 #define CA_FIRST_REG 12
 289   char can_split;
 290   /* These two are temporaries used internally.  */
 291   char start_reg;
 292   char reg_count;
 293   char mem_count;
 294   char special_p;
 295 } CUMULATIVE_ARGS;
 296
 297 #define INIT_CUMULATIVE_ARGS(CA, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 298   msp430_init_cumulative_args (&CA, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS)
 299
 300 \f
 301 /* FIXME */
 302 #define NO_PROFILE_COUNTERS     1
 303 #define PROFILE_BEFORE_PROLOGUE 1
 304
 305 #define FUNCTION_PROFILER(FILE, LABELNO)        \
 306     fprintf (FILE, "\tcall\t__mcount\n");
 307 \f
 308 #define HARD_REGNO_NREGS(REGNO, MODE)            \
 309   msp430_hard_regno_nregs (REGNO, MODE)
 310
 311 #define HARD_REGNO_MODE_OK(REGNO, MODE)                         \
 312   msp430_hard_regno_mode_ok (REGNO, MODE)
 313
 314 #define MODES_TIEABLE_P(MODE1, MODE2)                           \
 315   msp430_modes_tieable_p (MODE1, MODE2)
 316 \f
 317 /* Exception Handling */
 318
 319 /* R12,R13,R14 - EH data
 320    R15 - stack adjustment */
 321
 322 #define EH_RETURN_DATA_REGNO(N) \
 323   (((N) < 3) ? ((N) + 12) : INVALID_REGNUM)
 324
 325 #define EH_RETURN_HANDLER_RTX \
 326   gen_rtx_MEM(Pmode, gen_rtx_PLUS (Pmode, gen_rtx_REG(Pmode, SP_REGNO), gen_rtx_REG (Pmode, 15)))
 327
 328 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, 15)
 329
 330 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) DW_EH_PE_udata4
 331
 332 \f
 333 /* Stack Layout and Calling Conventions */
 334
 335 \f
 336 /* Addressing Modes */
 337
 338 \f
 339
 340 #define TEXT_SECTION_ASM_OP ".text"
 341 #define DATA_SECTION_ASM_OP ".data"
 342 #define BSS_SECTION_ASM_OP   "\t.section .bss"
 343
 344 #define ASM_COMMENT_START       " ;"
 345 #define ASM_APP_ON              ""
 346 #define ASM_APP_OFF             ""
 347 #define LOCAL_LABEL_PREFIX      ".L"
 348 #undef  USER_LABEL_PREFIX
 349 #define USER_LABEL_PREFIX       ""
 350
 351 #define GLOBAL_ASM_OP           "\t.global\t"
 352
 353 #define ASM_OUTPUT_LABELREF(FILE, SYM) msp430_output_labelref ((FILE), (SYM))
 354
 355 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 356   fprintf (FILE, "\t.long .L%d\n", VALUE)
 357
 358 /* This is how to output an element of a case-vector that is relative.
 359    Note: The local label referenced by the "3b" below is emitted by
 360    the tablejump insn.  */
 361
 362 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
 363   fprintf (FILE, "\t.long .L%d - 1b\n", VALUE)
 364
 365
 366 #define ASM_OUTPUT_ALIGN(STREAM, LOG)           \
 367   do                                            \
 368     {                                           \
 369       if ((LOG) == 0)                           \
 370         break;                                  \
 371       fprintf (STREAM, "\t.balign %d\n", 1 << (LOG));   \
 372     }                                           \
 373   while (0)
 374
 375 #define JUMP_TABLES_IN_TEXT_SECTION     1
 376 \f
 377 #undef  DWARF2_ADDR_SIZE
 378 #define DWARF2_ADDR_SIZE                        4
 379
 380 #define INCOMING_FRAME_SP_OFFSET                (TARGET_LARGE ? 4 : 2)
 381
 382 #undef  PREFERRED_DEBUGGING_TYPE
 383 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 384
 385 #define DWARF2_ASM_LINE_DEBUG_INFO              1
 386
 387 /* Prevent reload (and others) from choosing HImode stack slots
 388    when spilling hard registers when they may contain PSImode values.  */
 389 #define HARD_REGNO_CALLER_SAVE_MODE(REGNO,NREGS,MODE) \
 390   ((TARGET_LARGE && ((NREGS) <= 2)) ? PSImode : choose_hard_reg_mode ((REGNO), (NREGS), false))
 391
 392 /* Also stop GCC from thinking that it can eliminate (SUBREG:PSI (SI)).  */
 393 #define CANNOT_CHANGE_MODE_CLASS(FROM,TO,CLASS) \
 394   (   ((TO) == PSImode && (FROM) == SImode)     \
 395    || ((TO) == SImode  && (FROM) == PSImode)    \
 396    || ((TO) == DImode  && (FROM) == PSImode)    \
 397    || ((TO) == PSImode && (FROM) == DImode)     \
 398       )
 399
 400 #define ACCUMULATE_OUTGOING_ARGS 1
 401
 402 #undef  ASM_DECLARE_FUNCTION_NAME
 403 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
 404   msp430_start_function ((FILE), (NAME), (DECL))
 405
 406 #define TARGET_HAS_NO_HW_DIVIDE (! TARGET_HWMULT)
 407
 408 #undef  USE_SELECT_SECTION_FOR_FUNCTIONS
 409 #define USE_SELECT_SECTION_FOR_FUNCTIONS 1
 410
 411 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN)   \
 412   msp430_output_aligned_decl_common ((FILE), (DECL), (NAME), (SIZE), (ALIGN))