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