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, 2006 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       if (TARGET_HARD_FLOAT)                    \
  35         builtin_define ("__HAVE_FPU__");        \
  36     }                                           \
  37   while (0)
  38
  39 /* Don't try using XFmode on the 68010.  */
  40 #undef LONG_DOUBLE_TYPE_SIZE
  41 #define LONG_DOUBLE_TYPE_SIZE (TARGET_68020 ? 80 : 64)
  42
  43 #undef LIBGCC2_LONG_DOUBLE_TYPE_SIZE
  44 #ifdef __mc68010__
  45 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
  46 #else
  47 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
  48 #endif
  49
  50 #undef SUBTARGET_EXTRA_SPECS
  51 #define SUBTARGET_EXTRA_SPECS \
  52   { "netbsd_entry_point",   NETBSD_ENTRY_POINT },
  53
  54
  55 #undef TARGET_VERSION
  56 #define TARGET_VERSION                  \
  57   fprintf (stderr,                      \
  58            TARGET_68010                 \
  59            ? " (NetBSD/68010 ELF)"      \
  60            : " (NetBSD/m68k ELF)");
  61
  62
  63 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets.  Currently we
  64    deal with the GCC option '-posix', as well as an indication as to
  65    whether or not use of the FPU is allowed.  */
  66
  67 #undef CPP_SPEC
  68 #define CPP_SPEC NETBSD_CPP_SPEC
  69
  70
  71 /* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets.  We need
  72    to pass PIC code generation options.  */
  73
  74 #undef ASM_SPEC
  75 #define ASM_SPEC "%(asm_cpu_spec) %{fpic|fpie:-k} %{fPIC|fPIE:-k -K}"
  76
  77 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
  78
  79 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target.  */
  80
  81 #undef LINK_SPEC
  82 #define LINK_SPEC NETBSD_LINK_SPEC_ELF
  83
  84 #define NETBSD_ENTRY_POINT "_start"
  85
  86 /* Output assembler code to FILE to increment profiler label # LABELNO
  87    for profiling a function only.  */
  88
  89 #undef FUNCTION_PROFILER
  90 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
  91 do                                                                      \
  92   {                                                                     \
  93     asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO));        \
  94     if (flag_pic)                                                       \
  95       fprintf (FILE, "\tbsr.l __mcount@PLTPC\n");                       \
  96     else                                                                \
  97       fprintf (FILE, "\tjbsr __mcount\n");                              \
  98   }                                                                     \
  99 while (0)
 100
 101
 102 /* Make gcc agree with <machine/ansi.h>  */
 103
 104 #undef SIZE_TYPE
 105 #define SIZE_TYPE "unsigned int"
 106
 107 #undef PTRDIFF_TYPE
 108 #define PTRDIFF_TYPE "int"
 109
 110
 111 /* XXX
 112    Here is a bunch of stuff lifted from m68kelf.h.  We don't use that
 113    file directly, because it has a lot of baggage we don't want.  */
 114
 115
 116 /* The prefix for register names.  Note that REGISTER_NAMES
 117    is supposed to include this prefix.  Also note that this is NOT an
 118    fprintf format string, it is a literal string.  */
 119
 120 #undef REGISTER_PREFIX
 121 #define REGISTER_PREFIX "%"
 122
 123
 124 /* The prefix for local (compiler generated) lables.
 125    These labels will not appear in the symbol table.  */
 126
 127 #undef LOCAL_LABEL_PREFIX
 128 #define LOCAL_LABEL_PREFIX "."
 129
 130
 131 /* The prefix to add to user-visible assembler symbols.  */
 132
 133 #undef USER_LABEL_PREFIX
 134 #define USER_LABEL_PREFIX ""
 135
 136
 137 #undef ASM_COMMENT_START
 138 #define ASM_COMMENT_START "|"
 139
 140
 141 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 142    keep switch tables in the text section.  */
 143
 144 #undef JUMP_TABLES_IN_TEXT_SECTION
 145 #define JUMP_TABLES_IN_TEXT_SECTION 1
 146
 147
 148 /* Use the default action for outputting the case label.  */
 149 #undef ASM_OUTPUT_CASE_LABEL
 150 #define ASM_RETURN_CASE_JUMP                            \
 151   do {                                                  \
 152     if (TARGET_COLDFIRE)                                \
 153       {                                                 \
 154         if (ADDRESS_REG_P (operands[0]))                \
 155           return "jmp %%pc@(2,%0:l)";                   \
 156         else                                            \
 157           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
 158       }                                                 \
 159     else                                                \
 160       return "jmp %%pc@(2,%0:w)";                       \
 161   } while (0)
 162
 163
 164 /* This is how to output an assembler line that says to advance the
 165    location counter to a multiple of 2**LOG bytes.  */
 166
 167 #undef ASM_OUTPUT_ALIGN
 168 #define ASM_OUTPUT_ALIGN(FILE,LOG)                                      \
 169 do                                                                      \
 170   {                                                                     \
 171     if ((LOG) > 0)                                                      \
 172       fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));             \
 173   }                                                                     \
 174 while (0)
 175
 176
 177 /* If defined, a C expression whose value is a string containing the
 178    assembler operation to identify the following data as uninitialized global
 179    data.  */
 180
 181 #define BSS_SECTION_ASM_OP      ".section\t.bss"
 182
 183
 184 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 185    separate, explicit argument.  If you define this macro, it is used
 186    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 187    handling the required alignment of the variable.  The alignment is
 188    specified as the number of bits.
 189
 190    Try to use function `asm_output_aligned_bss' defined in file
 191    `varasm.c' when defining this macro.  */
 192
 193 #undef ASM_OUTPUT_ALIGNED_BSS
 194 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 195   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 196
 197
 198 #undef ASM_OUTPUT_COMMON
 199 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)                    \
 200 ( fputs (".comm ", (FILE)),                                             \
 201   assemble_name ((FILE), (NAME)),                                       \
 202   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 203
 204 #undef ASM_OUTPUT_LOCAL
 205 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)                     \
 206 ( fputs (".lcomm ", (FILE)),                                            \
 207   assemble_name ((FILE), (NAME)),                                       \
 208   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 209
 210
 211 /* XXX
 212    This is the end of the chunk lifted from m68kelf.h  */
 213
 214
 215 /* XXX
 216    The following chunk is more or less lifted from m68kv4.h.
 217    We'd like to just #include that file, but it has not yet
 218    been converted to the new include style.
 219
 220    Should there be a m68kv4-abi.h ??  */
 221
 222
 223 /* Register in which address to store a structure value is passed to a
 224    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */
 225
 226 #undef M68K_STRUCT_VALUE_REGNUM
 227 #define M68K_STRUCT_VALUE_REGNUM A0_REG
 228
 229
 230 /* Register in which static-chain is passed to a function.  The
 231    default isn m68k.h is a0, but that is already the struct value
 232    regnum.  Make it a1 instead.  */
 233
 234 #undef STATIC_CHAIN_REGNUM
 235 #define STATIC_CHAIN_REGNUM A1_REG
 236 #undef M68K_STATIC_CHAIN_REG_NAME
 237 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"
 238
 239
 240 /* Now to renumber registers for dbx and gdb.
 241    We use the Sun-3 convention, which is:
 242    floating point registers have numbers 18 to 25, not
 243    16 to 23 as they do in the compiler.  */
 244
 245 #undef DBX_REGISTER_NUMBER
 246 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
 247
 248
 249 /* 1 if N is a possible register number for a function value.  For
 250    m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
 251    pointer, or floating types, respectively.  Reject fp0 if not using
 252    a 68881 coprocessor.  */
 253
 254 #undef FUNCTION_VALUE_REGNO_P
 255 #define FUNCTION_VALUE_REGNO_P(N)                                       \
 256   ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))
 257
 258
 259 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
 260    more than one register.  */
 261
 262 #undef NEEDS_UNTYPED_CALL
 263 #define NEEDS_UNTYPED_CALL 1
 264
 265
 266 /* Define how to generate (in the callee) the output value of a
 267    function and how to find (in the caller) the value returned by a
 268    function.  VALTYPE is the data type of the value (as a tree).  If
 269    the precise function being called is known, FUNC is its
 270    FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
 271    result in d0, a0, or fp0 as appropriate.  */
 272
 273 #undef FUNCTION_VALUE
 274 #define FUNCTION_VALUE(VALTYPE, FUNC)                                   \
 275   m68k_function_value (VALTYPE, FUNC)
 276
 277
 278 /* Define how to find the value returned by a library function
 279    assuming the value has mode MODE.
 280    For m68k/SVR4 look for integer values in d0, pointer values in d0
 281    (returned in both d0 and a0), and floating values in fp0.  */
 282
 283 #undef LIBCALL_VALUE
 284 #define LIBCALL_VALUE(MODE)                                             \
 285   m68k_libcall_value (MODE)
 286
 287
 288 /* Boundary (in *bits*) on which stack pointer should be aligned.
 289    The m68k/SVR4 convention is to keep the stack pointer longword aligned.  */
 290
 291 #undef STACK_BOUNDARY
 292 #define STACK_BOUNDARY 32
 293
 294
 295 /* Alignment of field after `int : 0' in a structure.
 296    For m68k/SVR4, this is the next longword boundary.  */
 297
 298 #undef EMPTY_FIELD_BOUNDARY
 299 #define EMPTY_FIELD_BOUNDARY 32
 300
 301
 302 /* No data type wants to be aligned rounder than this.
 303    For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
 304    boundaries */
 305
 306 #undef BIGGEST_ALIGNMENT
 307 #define BIGGEST_ALIGNMENT 64
 308
 309
 310 /* The svr4 ABI for the m68k says that records and unions are returned
 311    in memory.  */
 312
 313 #undef DEFAULT_PCC_STRUCT_RETURN
 314 #define DEFAULT_PCC_STRUCT_RETURN 1
 315
 316 /* Output assembler code for a block containing the constant parts
 317    of a trampoline, leaving space for the variable parts.  */
 318
 319 /* On m68k svr4, the trampoline is different from the generic version
 320    in that we use a1 as the static call chain.  */
 321
 322 #undef TRAMPOLINE_TEMPLATE
 323 #define TRAMPOLINE_TEMPLATE(FILE)                                       \
 324 {                                                                       \
 325   assemble_aligned_integer (2, GEN_INT (0x227a));                       \
 326   assemble_aligned_integer (2, GEN_INT (8));                            \
 327   assemble_aligned_integer (2, GEN_INT (0x2f3a));                       \
 328   assemble_aligned_integer (2, GEN_INT (8));                            \
 329   assemble_aligned_integer (2, GEN_INT (0x4e75));                       \
 330   assemble_aligned_integer (4, const0_rtx);                             \
 331   assemble_aligned_integer (4, const0_rtx);                             \
 332 }
 333
 334 /* Redefine since we are using a different trampoline */
 335 #undef TRAMPOLINE_SIZE
 336 #define TRAMPOLINE_SIZE 18
 337
 338 /* Emit RTL insns to initialize the variable parts of a trampoline.
 339    FNADDR is an RTX for the address of the function's pure code.
 340    CXT is an RTX for the static chain value for the function.  */
 341
 342 #undef INITIALIZE_TRAMPOLINE
 343 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                       \
 344 {                                                                       \
 345   emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \
 346   emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \
 347 }
 348
 349
 350 /* XXX
 351    This is the end of the chunk lifted from m68kv4.h  */