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 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 1, 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
  63
  64 #define CPP_CPU_SPEC \
  65   "%{m68010:-D__mc68010__} \
  66    %{m68020:-D__mc68020__} \
  67    %{m68030:-D__mc68030__} \
  68    %{m68040:-D__mc68040__} \
  69    %(cpp_cpu_default_spec)"
  70
  71
  72 #undef TARGET_VERSION
  73 #if TARGET_DEFAULT & MASK_68020
  74 #define TARGET_VERSION fprintf (stderr, " (NetBSD/m68k ELF)");
  75 #define CPP_CPU_DEFAULT_SPEC "%{!m680*:-D__mc68020__}"
  76 #define ASM_DEFAULT_SPEC "%{!m680*:-m68020}"
  77 #else
  78 #define TARGET_VERSION fprintf (stderr, " (NetBSD/68010 ELF)");
  79 #define CPP_CPU_DEFAULT_SPEC "%{!m680*:-D__mc68010__}"
  80 #define ASM_DEFAULT_SPEC "%{!m680*:-m68010}"
  81 #endif
  82
  83
  84 #if TARGET_DEFAULT & MASK_68881
  85 #define CPP_FPU_SPEC "%{!msoft-float:-D__HAVE_68881__ -D__HAVE_FPU__}"
  86 #else
  87 #define CPP_FPU_SPEC "%{m68881:-D__HAVE_68881__ -D__HAVE_FPU__}"
  88 #endif
  89
  90
  91 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets.  Currently we
  92    deal with the GCC option '-posix', as well as an indication as to
  93    whether or not use of the FPU is allowed.  */
  94
  95 #undef CPP_SPEC
  96 #define CPP_SPEC \
  97   "%(netbsd_cpp_spec) %(cpp_cpu_spec) %(cpp_fpu_spec)"
  98
  99
 100 /* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets.  We pass
 101    on some CPU options, as well as PIC code generation options.  */
 102
 103 #undef ASM_SPEC
 104 #define ASM_SPEC \
 105   " %| %(asm_default_spec) \
 106     %{m68010} %{m68020} %{m68030} %{m68040} %{m68060} \
 107     %{fpic:-k} %{fPIC:-k -K}"
 108
 109 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target.
 110    This is a copy of LINK_SPEC from <netbsd-elf.h> tweaked for
 111    the m68k target.  */
 112
 113 #undef LINK_SPEC
 114 #define LINK_SPEC                                                       \
 115   "%{assert*} %{R*}                                                     \
 116    %{shared:-shared}                                                    \
 117    %{!shared:                                                           \
 118      -dc -dp                                                            \
 119      %{!nostdlib:                                                       \
 120        %{!r*:                                                           \
 121          %{!e*:-e _start}}}                                             \
 122      %{!static:                                                         \
 123        %{rdynamic:-export-dynamic}                                      \
 124        %{!dynamic-linker:-dynamic-linker /usr/libexec/ld.elf_so}}       \
 125      %{static:-static}}"
 126
 127
 128 /* Output assembler code to FILE to increment profiler label # LABELNO
 129    for profiling a function only.  */
 130
 131 #undef FUNCTION_PROFILER
 132 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 133 do                                                                      \
 134   {                                                                     \
 135     asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO));        \
 136     if (flag_pic)                                                       \
 137       fprintf (FILE, "\tbsr.l __mcount@PLTPC\n");                       \
 138     else                                                                \
 139       fprintf (FILE, "\tjbsr __mcount\n");                              \
 140   }                                                                     \
 141 while (0)
 142
 143
 144 /* Make gcc agree with <machine/ansi.h>  */
 145
 146 #undef SIZE_TYPE
 147 #define SIZE_TYPE "unsigned int"
 148
 149 #undef PTRDIFF_TYPE
 150 #define PTRDIFF_TYPE "int"
 151
 152
 153 /* XXX
 154    Here is a bunch of stuff lifted from m68kelf.h.  We don't use that
 155    file directly, because it has a lot of baggage we don't want.  */
 156
 157 #define MOTOROLA        /* Use Motorola syntax */
 158 #define USE_GAS         /* But GAS wants jbsr instead of jsr */
 159
 160
 161 /* The prefix for register names.  Note that REGISTER_NAMES
 162    is supposed to include this prefix.  Also note that this is NOT an
 163    fprintf format string, it is a literal string.  */
 164
 165 #undef REGISTER_PREFIX
 166 #define REGISTER_PREFIX "%"
 167
 168
 169 /* The prefix for local (compiler generated) lables.
 170    These labels will not appear in the symbol table.  */
 171
 172 #undef LOCAL_LABEL_PREFIX
 173 #define LOCAL_LABEL_PREFIX "."
 174
 175
 176 /* The prefix to add to user-visible assembler symbols.  */
 177
 178 #undef USER_LABEL_PREFIX
 179 #define USER_LABEL_PREFIX ""
 180
 181
 182 /* The prefix for immediate operands.  */
 183
 184 #undef IMMEDIATE_PREFIX
 185 #define IMMEDIATE_PREFIX "#"
 186
 187
 188 #undef ASM_COMMENT_START
 189 #define ASM_COMMENT_START "|"
 190
 191
 192 /* How to refer to registers in assembler output.
 193    This sequence is indexed by compiler's hard-register-number.
 194    Motorola format uses different register names than defined in m68k.h.
 195    We also take this chance to convert 'a6' to 'fp' */
 196
 197 #undef REGISTER_NAMES
 198
 199 #ifndef SUPPORT_SUN_FPA
 200
 201 #define REGISTER_NAMES                                                  \
 202 {"%d0",   "%d1",   "%d2",   "%d3",   "%d4",   "%d5",   "%d6",   "%d7",  \
 203  "%a0",   "%a1",   "%a2",   "%a3",   "%a4",   "%a5",   "%fp",   "%sp",  \
 204  "%fp0",  "%fp1",  "%fp2",  "%fp3",  "%fp4",  "%fp5",  "%fp6",  "%fp7" }
 205
 206 #else /* SUPPORT_SUN_FPA */
 207
 208 #define REGISTER_NAMES                                                  \
 209 {"%d0",   "%d1",   "%d2",   "%d3",   "%d4",   "%d5",   "%d6",   "%d7",  \
 210  "%a0",   "%a1",   "%a2",   "%a3",   "%a4",   "%a5",   "%fp",   "%sp",  \
 211  "%fp0",  "%fp1",  "%fp2",  "%fp3",  "%fp4",  "%fp5",  "%fp6",  "%fp7", \
 212  "%fpa0", "%fpa1", "%fpa2", "%fpa3", "%fpa4", "%fpa5", "%fpa6","%fpa7", \
 213  "%fpa8", "%fpa9", "%fpa10","%fpa11","%fpa12","%fpa13","%fpa14","%fpa15", \
 214  "%fpa16","%fpa17","%fpa18","%fpa19","%fpa20","%fpa21","%fpa22","%fpa23", \
 215  "%fpa24","%fpa25","%fpa26","%fpa27","%fpa28","%fpa29","%fpa30","%fpa31" }
 216
 217 #endif /* ! SUPPORT_SUN_FPA */
 218
 219
 220 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 221    keep switch tables in the text section.  */
 222
 223 #undef JUMP_TABLES_IN_TEXT_SECTION
 224 #define JUMP_TABLES_IN_TEXT_SECTION 1
 225
 226
 227 /* Use the default action for outputting the case label.  */
 228 #undef ASM_OUTPUT_CASE_LABEL
 229 #define ASM_RETURN_CASE_JUMP                                            \
 230 do                                                                      \
 231   {                                                                     \
 232     if (TARGET_5200)                                                    \
 233       return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";                          \
 234     else                                                                \
 235       return "jmp %%pc@(2,%0:w)";                                       \
 236   }                                                                     \
 237 while (0)
 238
 239
 240 /* This is how to output an assembler line that says to advance the
 241    location counter to a multiple of 2**LOG bytes.  */
 242
 243 #undef ASM_OUTPUT_ALIGN
 244 #define ASM_OUTPUT_ALIGN(FILE,LOG)                                      \
 245 do                                                                      \
 246   {                                                                     \
 247     if ((LOG) > 0)                                                      \
 248       fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));             \
 249   }                                                                     \
 250 while (0)
 251
 252
 253 /* If defined, a C expression whose value is a string containing the
 254    assembler operation to identify the following data as uninitialized global
 255    data.  */
 256
 257 #define BSS_SECTION_ASM_OP      ".section\t.bss"
 258
 259
 260 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 261    separate, explicit argument.  If you define this macro, it is used
 262    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 263    handling the required alignment of the variable.  The alignment is
 264    specified as the number of bits.
 265
 266    Try to use function `asm_output_aligned_bss' defined in file
 267    `varasm.c' when defining this macro.  */
 268
 269 #undef ASM_OUTPUT_ALIGNED_BSS
 270 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 271   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 272
 273
 274 #undef ASM_OUTPUT_COMMON
 275 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)                    \
 276 ( fputs (".comm ", (FILE)),                                             \
 277   assemble_name ((FILE), (NAME)),                                       \
 278   fprintf ((FILE), ",%u\n", (SIZE)))
 279
 280 #undef ASM_OUTPUT_LOCAL
 281 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)                     \
 282 ( fputs (".lcomm ", (FILE)),                                            \
 283   assemble_name ((FILE), (NAME)),                                       \
 284   fprintf ((FILE), ",%u\n", (SIZE)))
 285
 286
 287 /* Turn off function cse if we are doing PIC. We always want function
 288    call to be done as `bsr foo@PLTPC', so it will force the assembler
 289    to create the PLT entry for `foo'.  Doing function cse will cause
 290    the address of `foo' to be loaded into a register, which is exactly
 291    what we want to avoid when we are doing PIC on svr4 m68k.  */
 292
 293 #undef SUBTARGET_OVERRIDE_OPTIONS
 294 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 295   if (flag_pic) flag_no_function_cse = 1;
 296
 297
 298 /* XXX
 299    This is the end of the chunk lifted from m68kelf.h  */
 300
 301
 302 /* XXX
 303    The following chunk is more or less lifted from m68kv4.h.
 304    We'd like to just #include that file, but it has not yet
 305    been converted to the new include style.
 306
 307    Should there be a m68kv4-abi.h ??  */
 308
 309
 310 /* Register in which address to store a structure value is passed to a
 311    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */
 312
 313 #undef STRUCT_VALUE_REGNUM
 314 #define STRUCT_VALUE_REGNUM 8
 315
 316
 317 /* Register in which static-chain is passed to a function.  The
 318    default isn m68k.h is a0, but that is already the struct value
 319    regnum.  Make it a1 instead.  */
 320
 321 #undef STATIC_CHAIN_REGNUM
 322 #define STATIC_CHAIN_REGNUM 9
 323
 324
 325 /* Now to renumber registers for dbx and gdb.
 326    We use the Sun-3 convention, which is:
 327    floating point registers have numbers 18 to 25, not
 328    16 to 23 as they do in the compiler.  */
 329
 330 #undef DBX_REGISTER_NUMBER
 331 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
 332
 333
 334 /* 1 if N is a possible register number for a function value.  For
 335    m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
 336    pointer, or floating types, respectively.  Reject fp0 if not using
 337    a 68881 coprocessor.  */
 338
 339 #undef FUNCTION_VALUE_REGNO_P
 340 #define FUNCTION_VALUE_REGNO_P(N)                                       \
 341   ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
 342
 343
 344 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
 345    more than one register.  */
 346
 347 #undef NEEDS_UNTYPED_CALL
 348 #define NEEDS_UNTYPED_CALL 1
 349
 350
 351 /* Define how to generate (in the callee) the output value of a
 352    function and how to find (in the caller) the value returned by a
 353    function.  VALTYPE is the data type of the value (as a tree).  If
 354    the precise function being called is known, FUNC is its
 355    FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
 356    result in d0, a0, or fp0 as appropriate. */
 357
 358 #undef FUNCTION_VALUE
 359 #define FUNCTION_VALUE(VALTYPE, FUNC)                                   \
 360   (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881                     \
 361    ? gen_rtx_REG (TYPE_MODE (VALTYPE), 16)                              \
 362    : (POINTER_TYPE_P (VALTYPE)                                          \
 363       ? gen_rtx_REG (TYPE_MODE (VALTYPE), 8)                            \
 364       : gen_rtx_REG (TYPE_MODE (VALTYPE), 0)))
 365
 366
 367 /* For compatibility with the large body of existing code which does
 368    not always properly declare external functions returning pointer
 369    types, the m68k/SVR4 convention is to copy the value returned for
 370    pointer functions from a0 to d0 in the function epilogue, so that
 371    callers that have neglected to properly declare the callee can
 372    still find the correct return value.  */
 373
 374 extern int current_function_returns_pointer;
 375 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE)                             \
 376 do                                                                      \
 377   {                                                                     \
 378     if (current_function_returns_pointer                                \
 379         && ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode))   \
 380       asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n");                       \
 381   }                                                                     \
 382 while (0)
 383
 384
 385 /* Define how to find the value returned by a library function
 386    assuming the value has mode MODE.
 387    For m68k/SVR4 look for integer values in d0, pointer values in d0
 388    (returned in both d0 and a0), and floating values in fp0.  */
 389
 390 #undef LIBCALL_VALUE
 391 #define LIBCALL_VALUE(MODE)                                             \
 392   ((((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode)          \
 393     && TARGET_68881)                                                    \
 394    ? gen_rtx_REG (MODE, 16)                                             \
 395    : gen_rtx_REG (MODE, 0))
 396
 397
 398 /* Boundary (in *bits*) on which stack pointer should be aligned.
 399    The m68k/SVR4 convention is to keep the stack pointer longword aligned. */
 400
 401 #undef STACK_BOUNDARY
 402 #define STACK_BOUNDARY 32
 403
 404
 405 /* Alignment of field after `int : 0' in a structure.
 406    For m68k/SVR4, this is the next longword boundary. */
 407
 408 #undef EMPTY_FIELD_BOUNDARY
 409 #define EMPTY_FIELD_BOUNDARY 32
 410
 411
 412 /* No data type wants to be aligned rounder than this.
 413    For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
 414    boundaries */
 415
 416 #undef BIGGEST_ALIGNMENT
 417 #define BIGGEST_ALIGNMENT 64
 418
 419
 420 /* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is
 421    an operand of a function call. */
 422
 423 #undef LEGITIMATE_PIC_OPERAND_P
 424 #define LEGITIMATE_PIC_OPERAND_P(X)                                     \
 425   ((! symbolic_operand (X, VOIDmode)                                    \
 426     && ! (GET_CODE (X) == CONST_DOUBLE && mem_for_const_double (X)      \
 427           && GET_CODE (mem_for_const_double (X)) == MEM                 \
 428           && symbolic_operand (XEXP (mem_for_const_double (X), 0),      \
 429                                VOIDmode)))                              \
 430    || (GET_CODE (X) == SYMBOL_REF && SYMBOL_REF_FLAG (X))               \
 431    || PCREL_GENERAL_OPERAND_OK)
 432
 433
 434 /* For m68k SVR4, structures are returned using the reentrant
 435    technique. */
 436
 437 #undef PCC_STATIC_STRUCT_RETURN
 438
 439
 440 /* The svr4 ABI for the m68k says that records and unions are returned
 441    in memory.  */
 442
 443 #undef DEFAULT_PCC_STRUCT_RETURN
 444 #define DEFAULT_PCC_STRUCT_RETURN 1
 445
 446
 447 /* Output code to add DELTA to the first argument, and then jump to FUNCTION.
 448    Used for C++ multiple inheritance.  */
 449
 450 #define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION)        \
 451 do                                                                      \
 452   {                                                                     \
 453     if (DELTA > 0 && DELTA <= 8)                                        \
 454       asm_fprintf (FILE, "\taddq.l %I%d,4(%Rsp)\n", DELTA);             \
 455     else if (DELTA < 0 && DELTA >= -8)                                  \
 456       asm_fprintf (FILE, "\tsubq.l %I%d,4(%Rsp)\n", -DELTA);            \
 457     else                                                                \
 458       asm_fprintf (FILE, "\tadd.l %I%d,4(%Rsp)\n", DELTA);              \
 459                                                                         \
 460     if (flag_pic)                                                       \
 461       {                                                                 \
 462         fprintf (FILE, "\tbra.l ");                                     \
 463         assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0));  \
 464         fprintf (FILE, "@PLTPC\n");                                     \
 465       }                                                                 \
 466     else                                                                \
 467       {                                                                 \
 468         fprintf (FILE, "\tjmp ");                                       \
 469         assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0));  \
 470         fprintf (FILE, "\n");                                           \
 471       }                                                                 \
 472   }                                                                     \
 473 while (0)
 474
 475
 476 /* Output assembler code for a block containing the constant parts
 477    of a trampoline, leaving space for the variable parts.  */
 478
 479 /* On m68k svr4, the trampoline is different from the generic version
 480    in that we use a1 as the static call chain.  */
 481
 482 #undef TRAMPOLINE_TEMPLATE
 483 #define TRAMPOLINE_TEMPLATE(FILE)                                       \
 484 {                                                                       \
 485   assemble_aligned_integer (2, GEN_INT (0x227a));                       \
 486   assemble_aligned_integer (2, GEN_INT (8));                            \
 487   assemble_aligned_integer (2, GEN_INT (0x2f3a));                       \
 488   assemble_aligned_integer (2, GEN_INT (8));                            \
 489   assemble_aligned_integer (2, GEN_INT (0x4e75));                       \
 490   assemble_aligned_integer (4, const0_rtx);                             \
 491   assemble_aligned_integer (4, const0_rtx);                             \
 492 }
 493
 494 /* Redefine since we are using a different trampoline */
 495 #undef TRAMPOLINE_SIZE
 496 #define TRAMPOLINE_SIZE 18
 497
 498 /* Emit RTL insns to initialize the variable parts of a trampoline.
 499    FNADDR is an RTX for the address of the function's pure code.
 500    CXT is an RTX for the static chain value for the function.  */
 501
 502 #undef INITIALIZE_TRAMPOLINE
 503 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                       \
 504 {                                                                       \
 505   emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \
 506   emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \
 507 }
 508
 509
 510 /* XXX
 511    This is the end of the chunk lifted from m68kv4.h  */