gnu/dist/gcc4/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, 2004 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, 51 Franklin Street, Fifth Floor,
  25 Boston, MA 02110-1301, 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) ? 80 : 64)
  47
  48 #ifdef __mc68010__
  49 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
  50 #else
  51 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
  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 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 179    keep switch tables in the text section.  */
 180
 181 #undef JUMP_TABLES_IN_TEXT_SECTION
 182 #define JUMP_TABLES_IN_TEXT_SECTION 1
 183
 184
 185 /* Use the default action for outputting the case label.  */
 186 #undef ASM_OUTPUT_CASE_LABEL
 187 #define ASM_RETURN_CASE_JUMP                            \
 188   do {                                                  \
 189     if (TARGET_COLDFIRE)                                \
 190       {                                                 \
 191         if (ADDRESS_REG_P (operands[0]))                \
 192           return "jmp %%pc@(2,%0:l)";                   \
 193         else                                            \
 194           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
 195       }                                                 \
 196     else                                                \
 197       return "jmp %%pc@(2,%0:w)";                       \
 198   } while (0)
 199
 200
 201 /* This is how to output an assembler line that says to advance the
 202    location counter to a multiple of 2**LOG bytes.  */
 203
 204 #undef ASM_OUTPUT_ALIGN
 205 #define ASM_OUTPUT_ALIGN(FILE,LOG)                                      \
 206 do                                                                      \
 207   {                                                                     \
 208     if ((LOG) > 0)                                                      \
 209       fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));             \
 210   }                                                                     \
 211 while (0)
 212
 213
 214 /* If defined, a C expression whose value is a string containing the
 215    assembler operation to identify the following data as uninitialized global
 216    data.  */
 217
 218 #define BSS_SECTION_ASM_OP      ".section\t.bss"
 219
 220
 221 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 222    separate, explicit argument.  If you define this macro, it is used
 223    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 224    handling the required alignment of the variable.  The alignment is
 225    specified as the number of bits.
 226
 227    Try to use function `asm_output_aligned_bss' defined in file
 228    `varasm.c' when defining this macro.  */
 229
 230 #undef ASM_OUTPUT_ALIGNED_BSS
 231 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 232   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 233
 234
 235 #undef ASM_OUTPUT_COMMON
 236 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)                    \
 237 ( fputs (".comm ", (FILE)),                                             \
 238   assemble_name ((FILE), (NAME)),                                       \
 239   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 240
 241 #undef ASM_OUTPUT_LOCAL
 242 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)                     \
 243 ( fputs (".lcomm ", (FILE)),                                            \
 244   assemble_name ((FILE), (NAME)),                                       \
 245   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 246
 247
 248 /* XXX
 249    This is the end of the chunk lifted from m68kelf.h  */
 250
 251
 252 /* XXX
 253    The following chunk is more or less lifted from m68kv4.h.
 254    We'd like to just #include that file, but it has not yet
 255    been converted to the new include style.
 256
 257    Should there be a m68kv4-abi.h ??  */
 258
 259
 260 /* Register in which address to store a structure value is passed to a
 261    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */
 262
 263 #undef M68K_STRUCT_VALUE_REGNUM
 264 #define M68K_STRUCT_VALUE_REGNUM 8
 265
 266
 267 /* Register in which static-chain is passed to a function.  The
 268    default isn m68k.h is a0, but that is already the struct value
 269    regnum.  Make it a1 instead.  */
 270
 271 #undef STATIC_CHAIN_REGNUM
 272 #define STATIC_CHAIN_REGNUM 9
 273
 274
 275 /* Now to renumber registers for dbx and gdb.
 276    We use the Sun-3 convention, which is:
 277    floating point registers have numbers 18 to 25, not
 278    16 to 23 as they do in the compiler.  */
 279
 280 #undef DBX_REGISTER_NUMBER
 281 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
 282
 283
 284 /* 1 if N is a possible register number for a function value.  For
 285    m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
 286    pointer, or floating types, respectively.  Reject fp0 if not using
 287    a 68881 coprocessor.  */
 288
 289 #undef FUNCTION_VALUE_REGNO_P
 290 #define FUNCTION_VALUE_REGNO_P(N)                                       \
 291   ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
 292
 293
 294 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
 295    more than one register.  */
 296
 297 #undef NEEDS_UNTYPED_CALL
 298 #define NEEDS_UNTYPED_CALL 1
 299
 300
 301 /* Define how to generate (in the callee) the output value of a
 302    function and how to find (in the caller) the value returned by a
 303    function.  VALTYPE is the data type of the value (as a tree).  If
 304    the precise function being called is known, FUNC is its
 305    FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
 306    result in d0, a0, or fp0 as appropriate.  */
 307
 308 #undef FUNCTION_VALUE
 309 #define FUNCTION_VALUE(VALTYPE, FUNC)                                   \
 310   (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881                     \
 311    ? gen_rtx_REG (TYPE_MODE (VALTYPE), 16)                              \
 312    : (POINTER_TYPE_P (VALTYPE)                                          \
 313       ? gen_rtx_REG (TYPE_MODE (VALTYPE), 8)                            \
 314       : gen_rtx_REG (TYPE_MODE (VALTYPE), 0)))
 315
 316
 317 /* For compatibility with the large body of existing code which does
 318    not always properly declare external functions returning pointer
 319    types, the m68k/SVR4 convention is to copy the value returned for
 320    pointer functions from a0 to d0 in the function epilogue, so that
 321    callers that have neglected to properly declare the callee can
 322    still find the correct return value.  */
 323
 324 extern int current_function_returns_pointer;
 325 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE)                             \
 326 do                                                                      \
 327   {                                                                     \
 328     if (current_function_returns_pointer                                \
 329         && ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode))   \
 330       asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n");                       \
 331   }                                                                     \
 332 while (0)
 333
 334
 335 /* Define how to find the value returned by a library function
 336    assuming the value has mode MODE.
 337    For m68k/SVR4 look for integer values in d0, pointer values in d0
 338    (returned in both d0 and a0), and floating values in fp0.  */
 339
 340 #undef LIBCALL_VALUE
 341 #define LIBCALL_VALUE(MODE)                                             \
 342   ((((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode)          \
 343     && TARGET_68881)                                                    \
 344    ? gen_rtx_REG (MODE, 16)                                             \
 345    : gen_rtx_REG (MODE, 0))
 346
 347
 348 /* Boundary (in *bits*) on which stack pointer should be aligned.
 349    The m68k/SVR4 convention is to keep the stack pointer longword aligned.  */
 350
 351 #undef STACK_BOUNDARY
 352 #define STACK_BOUNDARY 32
 353
 354
 355 /* Alignment of field after `int : 0' in a structure.
 356    For m68k/SVR4, this is the next longword boundary.  */
 357
 358 #undef EMPTY_FIELD_BOUNDARY
 359 #define EMPTY_FIELD_BOUNDARY 32
 360
 361
 362 /* No data type wants to be aligned rounder than this.
 363    For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
 364    boundaries */
 365
 366 #undef BIGGEST_ALIGNMENT
 367 #define BIGGEST_ALIGNMENT 64
 368
 369
 370 /* For m68k SVR4, structures are returned using the reentrant
 371    technique.  */
 372
 373 #undef PCC_STATIC_STRUCT_RETURN
 374
 375
 376 /* The svr4 ABI for the m68k says that records and unions are returned
 377    in memory.  */
 378
 379 #undef DEFAULT_PCC_STRUCT_RETURN
 380 #define DEFAULT_PCC_STRUCT_RETURN 1
 381
 382 /* Output assembler code for a block containing the constant parts
 383    of a trampoline, leaving space for the variable parts.  */
 384
 385 /* On m68k svr4, the trampoline is different from the generic version
 386    in that we use a1 as the static call chain.  */
 387
 388 #undef TRAMPOLINE_TEMPLATE
 389 #define TRAMPOLINE_TEMPLATE(FILE)                                       \
 390 {                                                                       \
 391   assemble_aligned_integer (2, GEN_INT (0x227a));                       \
 392   assemble_aligned_integer (2, GEN_INT (8));                            \
 393   assemble_aligned_integer (2, GEN_INT (0x2f3a));                       \
 394   assemble_aligned_integer (2, GEN_INT (8));                            \
 395   assemble_aligned_integer (2, GEN_INT (0x4e75));                       \
 396   assemble_aligned_integer (4, const0_rtx);                             \
 397   assemble_aligned_integer (4, const0_rtx);                             \
 398 }
 399
 400 /* Redefine since we are using a different trampoline */
 401 #undef TRAMPOLINE_SIZE
 402 #define TRAMPOLINE_SIZE 18
 403
 404 /* Emit RTL insns to initialize the variable parts of a trampoline.
 405    FNADDR is an RTX for the address of the function's pure code.
 406    CXT is an RTX for the static chain value for the function.  */
 407
 408 #undef INITIALIZE_TRAMPOLINE
 409 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                       \
 410 {                                                                       \
 411   emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \
 412   emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \
 413 }
 414
 415
 416 /* XXX
 417    This is the end of the chunk lifted from m68kv4.h  */