gcc/config/m68k/netbsd-elf.h

   1 /* Definitions of target machine for GNU compiler,
   2    for m68k (including m68010) NetBSD platforms using the
   3    ELF object format.
   4    Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   5    Contributed by Wasabi Systems. Inc.
   6
   7    This file is derived from <m68k/m68kv4.h>, <m68k/m68kelf.h>,
   8    and <m68k/linux.h>.
   9
  10 This file is part of GNU CC.
  11
  12 GNU CC is free software; you can redistribute it and/or modify
  13 it under the terms of the GNU General Public License as published by
  14 the Free Software Foundation; either version 2, or (at your option)
  15 any later version.
  16
  17 GNU CC is distributed in the hope that it will be useful,
  18 but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 GNU General Public License for more details.
  21
  22 You should have received a copy of the GNU General Public License
  23 along with GNU CC; see the file COPYING.  If not, write to
  24 the Free Software Foundation, 59 Temple Place - Suite 330,
  25 Boston, MA 02111-1307, USA.  */
  26
  27 #define TARGET_OS_CPP_BUILTINS()                \
  28   do                                            \
  29     {                                           \
  30       NETBSD_OS_CPP_BUILTINS_ELF();             \
  31       builtin_define ("__m68k__");              \
  32       builtin_define ("__SVR4_ABI__");          \
  33       builtin_define ("__motorola__");          \
  34       builtin_assert ("cpu=m68k");              \
  35       builtin_assert ("machine=m68k");          \
  36     }                                           \
  37   while (0)
  38
  39 /* Default target comes from config.gcc */
  40 #undef TARGET_DEFAULT
  41 #define TARGET_DEFAULT TARGET_CPU_DEFAULT
  42
  43
  44 /* Don't try using XFmode on the 68010.  */
  45 #undef LONG_DOUBLE_TYPE_SIZE
  46 #define LONG_DOUBLE_TYPE_SIZE                   \
  47   ((TARGET_68020 || TARGET_68040 || TARGET_68040_ONLY || \
  48     TARGET_68060) ? 96 : 64)
  49
  50 #ifdef __mc68010__
  51 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
  52 #else
  53 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 96
  54 #endif
  55
  56 #define EXTRA_SPECS \
  57   { "cpp_cpu_default_spec", CPP_CPU_DEFAULT_SPEC }, \
  58   { "cpp_cpu_spec",         CPP_CPU_SPEC }, \
  59   { "cpp_fpu_spec",         CPP_FPU_SPEC }, \
  60   { "asm_default_spec",     ASM_DEFAULT_SPEC }, \
  61   { "netbsd_cpp_spec",      NETBSD_CPP_SPEC }, \
  62   { "netbsd_entry_point",   NETBSD_ENTRY_POINT },
  63
  64
  65 #define CPP_CPU_SPEC \
  66   "%{m68010:-D__mc68010__} \
  67    %{m68020:-D__mc68020__} \
  68    %{m68030:-D__mc68030__} \
  69    %{m68040:-D__mc68040__} \
  70    %(cpp_cpu_default_spec)"
  71
  72
  73 #undef TARGET_VERSION
  74 #if TARGET_DEFAULT & MASK_68020
  75 #define TARGET_VERSION fprintf (stderr, " (NetBSD/m68k ELF)");
  76 #define CPP_CPU_DEFAULT_SPEC "%{!m680*:-D__mc68020__}"
  77 #define ASM_DEFAULT_SPEC "%{!m680*:-m68020}"
  78 #else
  79 #define TARGET_VERSION fprintf (stderr, " (NetBSD/68010 ELF)");
  80 #define CPP_CPU_DEFAULT_SPEC "%{!m680*:-D__mc68010__}"
  81 #define ASM_DEFAULT_SPEC "%{!m680*:-m68010}"
  82 #endif
  83
  84
  85 #if TARGET_DEFAULT & MASK_68881
  86 #define CPP_FPU_SPEC "%{!msoft-float:-D__HAVE_68881__ -D__HAVE_FPU__}"
  87 #else
  88 #define CPP_FPU_SPEC "%{m68881:-D__HAVE_68881__ -D__HAVE_FPU__}"
  89 #endif
  90
  91
  92 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets.  Currently we
  93    deal with the GCC option '-posix', as well as an indication as to
  94    whether or not use of the FPU is allowed.  */
  95
  96 #undef CPP_SPEC
  97 #define CPP_SPEC \
  98   "%(netbsd_cpp_spec) %(cpp_cpu_spec) %(cpp_fpu_spec)"
  99
 100
 101 /* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets.  We pass
 102    on some CPU options, as well as PIC code generation options.  */
 103
 104 #undef ASM_SPEC
 105 #define ASM_SPEC \
 106   "%(asm_default_spec) \
 107     %{m68010} %{m68020} %{m68030} %{m68040} %{m68060} \
 108     %{fpic:-k} %{fPIC:-k -K}"
 109
 110 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
 111
 112 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target.  */
 113
 114 #undef LINK_SPEC
 115 #define LINK_SPEC NETBSD_LINK_SPEC_ELF
 116
 117 #define NETBSD_ENTRY_POINT "_start"
 118
 119 /* Output assembler code to FILE to increment profiler label # LABELNO
 120    for profiling a function only.  */
 121
 122 #undef FUNCTION_PROFILER
 123 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 124 do                                                                      \
 125   {                                                                     \
 126     asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO));        \
 127     if (flag_pic)                                                       \
 128       fprintf (FILE, "\tbsr.l __mcount@PLTPC\n");                       \
 129     else                                                                \
 130       fprintf (FILE, "\tjbsr __mcount\n");                              \
 131   }                                                                     \
 132 while (0)
 133
 134
 135 /* Make gcc agree with <machine/ansi.h>  */
 136
 137 #undef SIZE_TYPE
 138 #define SIZE_TYPE "unsigned int"
 139
 140 #undef PTRDIFF_TYPE
 141 #define PTRDIFF_TYPE "int"
 142
 143
 144 /* XXX
 145    Here is a bunch of stuff lifted from m68kelf.h.  We don't use that
 146    file directly, because it has a lot of baggage we don't want.  */
 147
 148 #define MOTOROLA        /* Use Motorola syntax */
 149 #define USE_GAS         /* But GAS wants jbsr instead of jsr */
 150
 151
 152 /* The prefix for register names.  Note that REGISTER_NAMES
 153    is supposed to include this prefix.  Also note that this is NOT an
 154    fprintf format string, it is a literal string.  */
 155
 156 #undef REGISTER_PREFIX
 157 #define REGISTER_PREFIX "%"
 158
 159
 160 /* The prefix for local (compiler generated) lables.
 161    These labels will not appear in the symbol table.  */
 162
 163 #undef LOCAL_LABEL_PREFIX
 164 #define LOCAL_LABEL_PREFIX "."
 165
 166
 167 /* The prefix to add to user-visible assembler symbols.  */
 168
 169 #undef USER_LABEL_PREFIX
 170 #define USER_LABEL_PREFIX ""
 171
 172
 173 /* The prefix for immediate operands.  */
 174
 175 #undef IMMEDIATE_PREFIX
 176 #define IMMEDIATE_PREFIX "#"
 177
 178
 179 #undef ASM_COMMENT_START
 180 #define ASM_COMMENT_START "|"
 181
 182
 183 /* How to refer to registers in assembler output.
 184    This sequence is indexed by compiler's hard-register-number.
 185    Motorola format uses different register names than defined in m68k.h.
 186    We also take this chance to convert 'a6' to 'fp' */
 187
 188 #undef REGISTER_NAMES
 189
 190 #define REGISTER_NAMES                                                  \
 191 {"%d0",   "%d1",   "%d2",   "%d3",   "%d4",   "%d5",   "%d6",   "%d7",  \
 192  "%a0",   "%a1",   "%a2",   "%a3",   "%a4",   "%a5",   "%fp",   "%sp",  \
 193  "%fp0",  "%fp1",  "%fp2",  "%fp3",  "%fp4",  "%fp5",  "%fp6",  "%fp7" }
 194
 195
 196 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 197    keep switch tables in the text section.  */
 198
 199 #undef JUMP_TABLES_IN_TEXT_SECTION
 200 #define JUMP_TABLES_IN_TEXT_SECTION 1
 201
 202
 203 /* Use the default action for outputting the case label.  */
 204 #undef ASM_OUTPUT_CASE_LABEL
 205 #define ASM_RETURN_CASE_JUMP                            \
 206   do {                                                  \
 207     if (TARGET_5200)                                    \
 208       {                                                 \
 209         if (ADDRESS_REG_P (operands[0]))                \
 210           return "jmp %%pc@(2,%0:l)";                   \
 211         else                                            \
 212           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
 213       }                                                 \
 214     else                                                \
 215       return "jmp %%pc@(2,%0:w)";                       \
 216   } while (0)
 217
 218
 219 /* This is how to output an assembler line that says to advance the
 220    location counter to a multiple of 2**LOG bytes.  */
 221
 222 #undef ASM_OUTPUT_ALIGN
 223 #define ASM_OUTPUT_ALIGN(FILE,LOG)                                      \
 224 do                                                                      \
 225   {                                                                     \
 226     if ((LOG) > 0)                                                      \
 227       fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));             \
 228   }                                                                     \
 229 while (0)
 230
 231
 232 /* If defined, a C expression whose value is a string containing the
 233    assembler operation to identify the following data as uninitialized global
 234    data.  */
 235
 236 #define BSS_SECTION_ASM_OP      ".section\t.bss"
 237
 238
 239 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 240    separate, explicit argument.  If you define this macro, it is used
 241    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 242    handling the required alignment of the variable.  The alignment is
 243    specified as the number of bits.
 244
 245    Try to use function `asm_output_aligned_bss' defined in file
 246    `varasm.c' when defining this macro.  */
 247
 248 #undef ASM_OUTPUT_ALIGNED_BSS
 249 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 250   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 251
 252
 253 #undef ASM_OUTPUT_COMMON
 254 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)                    \
 255 ( fputs (".comm ", (FILE)),                                             \
 256   assemble_name ((FILE), (NAME)),                                       \
 257   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 258
 259 #undef ASM_OUTPUT_LOCAL
 260 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)                     \
 261 ( fputs (".lcomm ", (FILE)),                                            \
 262   assemble_name ((FILE), (NAME)),                                       \
 263   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 264
 265
 266 /* XXX
 267    This is the end of the chunk lifted from m68kelf.h  */
 268
 269
 270 /* XXX
 271    The following chunk is more or less lifted from m68kv4.h.
 272    We'd like to just #include that file, but it has not yet
 273    been converted to the new include style.
 274
 275    Should there be a m68kv4-abi.h ??  */
 276
 277
 278 /* Register in which address to store a structure value is passed to a
 279    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */
 280
 281 #undef STRUCT_VALUE_REGNUM
 282 #define STRUCT_VALUE_REGNUM 8
 283
 284
 285 /* Register in which static-chain is passed to a function.  The
 286    default isn m68k.h is a0, but that is already the struct value
 287    regnum.  Make it a1 instead.  */
 288
 289 #undef STATIC_CHAIN_REGNUM
 290 #define STATIC_CHAIN_REGNUM 9
 291
 292
 293 /* Now to renumber registers for dbx and gdb.
 294    We use the Sun-3 convention, which is:
 295    floating point registers have numbers 18 to 25, not
 296    16 to 23 as they do in the compiler.  */
 297
 298 #undef DBX_REGISTER_NUMBER
 299 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
 300
 301
 302 /* 1 if N is a possible register number for a function value.  For
 303    m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
 304    pointer, or floating types, respectively.  Reject fp0 if not using
 305    a 68881 coprocessor.  */
 306
 307 #undef FUNCTION_VALUE_REGNO_P
 308 #define FUNCTION_VALUE_REGNO_P(N)                                       \
 309   ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
 310
 311
 312 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
 313    more than one register.  */
 314
 315 #undef NEEDS_UNTYPED_CALL
 316 #define NEEDS_UNTYPED_CALL 1
 317
 318
 319 /* Define how to generate (in the callee) the output value of a
 320    function and how to find (in the caller) the value returned by a
 321    function.  VALTYPE is the data type of the value (as a tree).  If
 322    the precise function being called is known, FUNC is its
 323    FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
 324    result in d0, a0, or fp0 as appropriate. */
 325
 326 #undef FUNCTION_VALUE
 327 #define FUNCTION_VALUE(VALTYPE, FUNC)                                   \
 328   (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881                     \
 329    ? gen_rtx_REG (TYPE_MODE (VALTYPE), 16)                              \
 330    : (POINTER_TYPE_P (VALTYPE)                                          \
 331       ? gen_rtx_REG (TYPE_MODE (VALTYPE), 8)                            \
 332       : gen_rtx_REG (TYPE_MODE (VALTYPE), 0)))
 333
 334
 335 /* For compatibility with the large body of existing code which does
 336    not always properly declare external functions returning pointer
 337    types, the m68k/SVR4 convention is to copy the value returned for
 338    pointer functions from a0 to d0 in the function epilogue, so that
 339    callers that have neglected to properly declare the callee can
 340    still find the correct return value.  */
 341
 342 extern int current_function_returns_pointer;
 343 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE)                             \
 344 do                                                                      \
 345   {                                                                     \
 346     if (current_function_returns_pointer                                \
 347         && ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode))   \
 348       asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n");                       \
 349   }                                                                     \
 350 while (0)
 351
 352
 353 /* Define how to find the value returned by a library function
 354    assuming the value has mode MODE.
 355    For m68k/SVR4 look for integer values in d0, pointer values in d0
 356    (returned in both d0 and a0), and floating values in fp0.  */
 357
 358 #undef LIBCALL_VALUE
 359 #define LIBCALL_VALUE(MODE)                                             \
 360   ((((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode)          \
 361     && TARGET_68881)                                                    \
 362    ? gen_rtx_REG (MODE, 16)                                             \
 363    : gen_rtx_REG (MODE, 0))
 364
 365
 366 /* Boundary (in *bits*) on which stack pointer should be aligned.
 367    The m68k/SVR4 convention is to keep the stack pointer longword aligned. */
 368
 369 #undef STACK_BOUNDARY
 370 #define STACK_BOUNDARY 32
 371
 372
 373 /* Alignment of field after `int : 0' in a structure.
 374    For m68k/SVR4, this is the next longword boundary. */
 375
 376 #undef EMPTY_FIELD_BOUNDARY
 377 #define EMPTY_FIELD_BOUNDARY 32
 378
 379
 380 /* No data type wants to be aligned rounder than this.
 381    For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
 382    boundaries */
 383
 384 #undef BIGGEST_ALIGNMENT
 385 #define BIGGEST_ALIGNMENT 64
 386
 387
 388 /* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is
 389    an operand of a function call. */
 390
 391 #undef LEGITIMATE_PIC_OPERAND_P
 392 #define LEGITIMATE_PIC_OPERAND_P(X)                                     \
 393   ((! symbolic_operand (X, VOIDmode)                                    \
 394     && ! (GET_CODE (X) == CONST_DOUBLE && mem_for_const_double (X)      \
 395           && GET_CODE (mem_for_const_double (X)) == MEM                 \
 396           && symbolic_operand (XEXP (mem_for_const_double (X), 0),      \
 397                                VOIDmode)))                              \
 398    || (GET_CODE (X) == SYMBOL_REF && SYMBOL_REF_FLAG (X))               \
 399    || PCREL_GENERAL_OPERAND_OK)
 400
 401
 402 /* For m68k SVR4, structures are returned using the reentrant
 403    technique. */
 404
 405 #undef PCC_STATIC_STRUCT_RETURN
 406
 407
 408 /* The svr4 ABI for the m68k says that records and unions are returned
 409    in memory.  */
 410
 411 #undef DEFAULT_PCC_STRUCT_RETURN
 412 #define DEFAULT_PCC_STRUCT_RETURN 1
 413
 414 /* Output assembler code for a block containing the constant parts
 415    of a trampoline, leaving space for the variable parts.  */
 416
 417 /* On m68k svr4, the trampoline is different from the generic version
 418    in that we use a1 as the static call chain.  */
 419
 420 #undef TRAMPOLINE_TEMPLATE
 421 #define TRAMPOLINE_TEMPLATE(FILE)                                       \
 422 {                                                                       \
 423   assemble_aligned_integer (2, GEN_INT (0x227a));                       \
 424   assemble_aligned_integer (2, GEN_INT (8));                            \
 425   assemble_aligned_integer (2, GEN_INT (0x2f3a));                       \
 426   assemble_aligned_integer (2, GEN_INT (8));                            \
 427   assemble_aligned_integer (2, GEN_INT (0x4e75));                       \
 428   assemble_aligned_integer (4, const0_rtx);                             \
 429   assemble_aligned_integer (4, const0_rtx);                             \
 430 }
 431
 432 /* Redefine since we are using a different trampoline */
 433 #undef TRAMPOLINE_SIZE
 434 #define TRAMPOLINE_SIZE 18
 435
 436 /* Emit RTL insns to initialize the variable parts of a trampoline.
 437    FNADDR is an RTX for the address of the function's pure code.
 438    CXT is an RTX for the static chain value for the function.  */
 439
 440 #undef INITIALIZE_TRAMPOLINE
 441 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                       \
 442 {                                                                       \
 443   emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \
 444   emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \
 445 }
 446
 447
 448 /* XXX
 449    This is the end of the chunk lifted from m68kv4.h  */