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, 2007, 2009, 2010
   5    Free Software Foundation, Inc.
   6    Contributed by Wasabi Systems. Inc.
   7
   8    This file is derived from <m68k/m68kv4.h>, <m68k/m68kelf.h>,
   9    and <m68k/linux.h>.
  10
  11 This file is part of GCC.
  12
  13 GCC is free software; you can redistribute it and/or modify
  14 it under the terms of the GNU General Public License as published by
  15 the Free Software Foundation; either version 3, or (at your option)
  16 any later version.
  17
  18 GCC is distributed in the hope that it will be useful,
  19 but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 GNU General Public License for more details.
  22
  23 You should have received a copy of the GNU General Public License
  24 along with GCC; see the file COPYING3.  If not see
  25 <http://www.gnu.org/licenses/>.  */
  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 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target.  */
  78
  79 #undef LINK_SPEC
  80 #define LINK_SPEC NETBSD_LINK_SPEC_ELF
  81
  82 #define NETBSD_ENTRY_POINT "_start"
  83
  84 /* Output assembler code to FILE to increment profiler label # LABELNO
  85    for profiling a function only.  */
  86
  87 #undef FUNCTION_PROFILER
  88 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
  89 do                                                                      \
  90   {                                                                     \
  91     asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO));        \
  92     if (flag_pic)                                                       \
  93       fprintf (FILE, "\tbsr.l __mcount@PLTPC\n");                       \
  94     else                                                                \
  95       fprintf (FILE, "\tjbsr __mcount\n");                              \
  96   }                                                                     \
  97 while (0)
  98
  99
 100 /* Make gcc agree with <machine/ansi.h>  */
 101
 102 #undef SIZE_TYPE
 103 #define SIZE_TYPE "unsigned int"
 104
 105 #undef PTRDIFF_TYPE
 106 #define PTRDIFF_TYPE "int"
 107
 108
 109 /* XXX
 110    Here is a bunch of stuff lifted from m68kelf.h.  We don't use that
 111    file directly, because it has a lot of baggage we don't want.  */
 112
 113
 114 /* The prefix for register names.  Note that REGISTER_NAMES
 115    is supposed to include this prefix.  Also note that this is NOT an
 116    fprintf format string, it is a literal string.  */
 117
 118 #undef REGISTER_PREFIX
 119 #define REGISTER_PREFIX "%"
 120
 121
 122 /* The prefix for local (compiler generated) lables.
 123    These labels will not appear in the symbol table.  */
 124
 125 #undef LOCAL_LABEL_PREFIX
 126 #define LOCAL_LABEL_PREFIX "."
 127
 128
 129 /* The prefix to add to user-visible assembler symbols.  */
 130
 131 #undef USER_LABEL_PREFIX
 132 #define USER_LABEL_PREFIX ""
 133
 134
 135 #undef ASM_COMMENT_START
 136 #define ASM_COMMENT_START "|"
 137
 138
 139 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 140    keep switch tables in the text section.  */
 141
 142 #undef JUMP_TABLES_IN_TEXT_SECTION
 143 #define JUMP_TABLES_IN_TEXT_SECTION 1
 144
 145
 146 /* Use the default action for outputting the case label.  */
 147 #undef ASM_OUTPUT_CASE_LABEL
 148 #define ASM_RETURN_CASE_JUMP                            \
 149   do {                                                  \
 150     if (TARGET_COLDFIRE)                                \
 151       {                                                 \
 152         if (ADDRESS_REG_P (operands[0]))                \
 153           return "jmp %%pc@(2,%0:l)";                   \
 154         else                                            \
 155           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
 156       }                                                 \
 157     else                                                \
 158       return "jmp %%pc@(2,%0:w)";                       \
 159   } while (0)
 160
 161
 162 /* This is how to output an assembler line that says to advance the
 163    location counter to a multiple of 2**LOG bytes.  */
 164
 165 #undef ASM_OUTPUT_ALIGN
 166 #define ASM_OUTPUT_ALIGN(FILE,LOG)                                      \
 167 do                                                                      \
 168   {                                                                     \
 169     if ((LOG) > 0)                                                      \
 170       fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));             \
 171   }                                                                     \
 172 while (0)
 173
 174
 175 /* If defined, a C expression whose value is a string containing the
 176    assembler operation to identify the following data as uninitialized global
 177    data.  */
 178
 179 #define BSS_SECTION_ASM_OP      ".section\t.bss"
 180
 181
 182 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 183    separate, explicit argument.  If you define this macro, it is used
 184    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 185    handling the required alignment of the variable.  The alignment is
 186    specified as the number of bits.
 187
 188    Try to use function `asm_output_aligned_bss' defined in file
 189    `varasm.c' when defining this macro.  */
 190
 191 #undef ASM_OUTPUT_ALIGNED_BSS
 192 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 193   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 194
 195
 196 #undef ASM_OUTPUT_COMMON
 197 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)                    \
 198 ( fputs (".comm ", (FILE)),                                             \
 199   assemble_name ((FILE), (NAME)),                                       \
 200   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 201
 202 #undef ASM_OUTPUT_LOCAL
 203 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)                     \
 204 ( fputs (".lcomm ", (FILE)),                                            \
 205   assemble_name ((FILE), (NAME)),                                       \
 206   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 207
 208
 209 /* XXX
 210    This is the end of the chunk lifted from m68kelf.h  */
 211
 212
 213 /* XXX
 214    The following chunk is more or less lifted from m68kv4.h.
 215    We'd like to just #include that file, but it has not yet
 216    been converted to the new include style.
 217
 218    Should there be a m68kv4-abi.h ??  */
 219
 220
 221 /* Register in which address to store a structure value is passed to a
 222    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */
 223
 224 #undef M68K_STRUCT_VALUE_REGNUM
 225 #define M68K_STRUCT_VALUE_REGNUM A0_REG
 226
 227
 228 /* Register in which static-chain is passed to a function.  The
 229    default isn m68k.h is a0, but that is already the struct value
 230    regnum.  Make it a1 instead.  */
 231
 232 #undef STATIC_CHAIN_REGNUM
 233 #define STATIC_CHAIN_REGNUM A1_REG
 234 #undef M68K_STATIC_CHAIN_REG_NAME
 235 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"
 236
 237
 238 /* Now to renumber registers for dbx and gdb.
 239    We use the Sun-3 convention, which is:
 240    floating point registers have numbers 18 to 25, not
 241    16 to 23 as they do in the compiler.  */
 242
 243 #undef DBX_REGISTER_NUMBER
 244 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
 245
 246
 247 /* 1 if N is a possible register number for a function value.  For
 248    m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
 249    pointer, or floating types, respectively.  Reject fp0 if not using
 250    a 68881 coprocessor.  */
 251
 252 #undef FUNCTION_VALUE_REGNO_P
 253 #define FUNCTION_VALUE_REGNO_P(N)                                       \
 254   ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))
 255
 256
 257 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
 258    more than one register.  */
 259
 260 #undef NEEDS_UNTYPED_CALL
 261 #define NEEDS_UNTYPED_CALL 1
 262
 263
 264 /* Define how to generate (in the callee) the output value of a
 265    function and how to find (in the caller) the value returned by a
 266    function.  VALTYPE is the data type of the value (as a tree).  If
 267    the precise function being called is known, FUNC is its
 268    FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
 269    result in d0, a0, or fp0 as appropriate.  */
 270
 271 #undef FUNCTION_VALUE
 272 #define FUNCTION_VALUE(VALTYPE, FUNC)                                   \
 273   m68k_function_value (VALTYPE, FUNC)
 274
 275
 276 /* Define how to find the value returned by a library function
 277    assuming the value has mode MODE.
 278    For m68k/SVR4 look for integer values in d0, pointer values in d0
 279    (returned in both d0 and a0), and floating values in fp0.  */
 280
 281 #undef LIBCALL_VALUE
 282 #define LIBCALL_VALUE(MODE)                                             \
 283   m68k_libcall_value (MODE)
 284
 285
 286 /* Boundary (in *bits*) on which stack pointer should be aligned.
 287    The m68k/SVR4 convention is to keep the stack pointer longword aligned.  */
 288
 289 #undef STACK_BOUNDARY
 290 #define STACK_BOUNDARY 32
 291
 292
 293 /* Alignment of field after `int : 0' in a structure.
 294    For m68k/SVR4, this is the next longword boundary.  */
 295
 296 #undef EMPTY_FIELD_BOUNDARY
 297 #define EMPTY_FIELD_BOUNDARY 32
 298
 299
 300 /* No data type wants to be aligned rounder than this.
 301    For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
 302    boundaries */
 303
 304 #undef BIGGEST_ALIGNMENT
 305 #define BIGGEST_ALIGNMENT 64
 306
 307
 308 /* The svr4 ABI for the m68k says that records and unions are returned
 309    in memory.  */
 310
 311 #undef DEFAULT_PCC_STRUCT_RETURN
 312 #define DEFAULT_PCC_STRUCT_RETURN 1
 313
 314 /* XXX
 315    This is the end of the chunk lifted from m68kv4.h  */