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) 2002-2017 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 3, 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 COPYING3.  If not see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #define TARGET_OS_CPP_BUILTINS()                \
  27   do                                            \
  28     {                                           \
  29       NETBSD_OS_CPP_BUILTINS_ELF();             \
  30       builtin_define ("__m68k__");              \
  31       builtin_define ("__SVR4_ABI__");          \
  32       builtin_define ("__motorola__");          \
  33       if (TARGET_HARD_FLOAT)                    \
  34         builtin_define ("__HAVE_FPU__");        \
  35     }                                           \
  36   while (0)
  37
  38 /* Don't try using XFmode on the 68010.  */
  39 #undef LONG_DOUBLE_TYPE_SIZE
  40 #define LONG_DOUBLE_TYPE_SIZE (TARGET_68020 ? 80 : 64)
  41
  42 #undef SUBTARGET_EXTRA_SPECS
  43 #define SUBTARGET_EXTRA_SPECS \
  44   { "netbsd_entry_point",   NETBSD_ENTRY_POINT },
  45
  46
  47 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets.  Currently we
  48    deal with the GCC option '-posix', as well as an indication as to
  49    whether or not use of the FPU is allowed.  */
  50
  51 #undef CPP_SPEC
  52 #define CPP_SPEC NETBSD_CPP_SPEC
  53
  54
  55 /* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets.  We need
  56    to pass PIC code generation options.  */
  57
  58 #undef ASM_SPEC
  59 #define ASM_SPEC \
  60   "%(asm_cpu_spec) %{" FPIE1_OR_FPIC1_SPEC ":-k} %{" FPIE2_OR_FPIC2_SPEC ":-k -K}"
  61
  62 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target.  */
  63
  64 #undef LINK_SPEC
  65 #define LINK_SPEC NETBSD_LINK_SPEC_ELF
  66
  67 #define NETBSD_ENTRY_POINT "_start"
  68
  69 /* Output assembler code to FILE to increment profiler label # LABELNO
  70    for profiling a function only.  */
  71
  72 #undef FUNCTION_PROFILER
  73 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
  74 do                                                                      \
  75   {                                                                     \
  76     asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO));        \
  77     if (flag_pic)                                                       \
  78       fprintf (FILE, "\tbsr.l __mcount@PLTPC\n");                       \
  79     else                                                                \
  80       fprintf (FILE, "\tjbsr __mcount\n");                              \
  81   }                                                                     \
  82 while (0)
  83
  84
  85 /* Make gcc agree with <machine/ansi.h>  */
  86
  87 #undef SIZE_TYPE
  88 #define SIZE_TYPE "unsigned int"
  89
  90 #undef PTRDIFF_TYPE
  91 #define PTRDIFF_TYPE "int"
  92
  93
  94 /* XXX
  95    Here is a bunch of stuff lifted from m68kelf.h.  We don't use that
  96    file directly, because it has a lot of baggage we don't want.  */
  97
  98
  99 /* The prefix for register names.  Note that REGISTER_NAMES
 100    is supposed to include this prefix.  Also note that this is NOT an
 101    fprintf format string, it is a literal string.  */
 102
 103 #undef REGISTER_PREFIX
 104 #define REGISTER_PREFIX "%"
 105
 106
 107 /* The prefix for local (compiler generated) lables.
 108    These labels will not appear in the symbol table.  */
 109
 110 #undef LOCAL_LABEL_PREFIX
 111 #define LOCAL_LABEL_PREFIX "."
 112
 113
 114 /* The prefix to add to user-visible assembler symbols.  */
 115
 116 #undef USER_LABEL_PREFIX
 117 #define USER_LABEL_PREFIX ""
 118
 119
 120 #undef ASM_COMMENT_START
 121 #define ASM_COMMENT_START "|"
 122
 123
 124 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 125    keep switch tables in the text section.  */
 126
 127 #undef JUMP_TABLES_IN_TEXT_SECTION
 128 #define JUMP_TABLES_IN_TEXT_SECTION 1
 129
 130
 131 /* Use the default action for outputting the case label.  */
 132 #undef ASM_OUTPUT_CASE_LABEL
 133 #define ASM_RETURN_CASE_JUMP                            \
 134   do {                                                  \
 135     if (TARGET_COLDFIRE)                                \
 136       {                                                 \
 137         if (ADDRESS_REG_P (operands[0]))                \
 138           return "jmp %%pc@(2,%0:l)";                   \
 139         else if (TARGET_LONG_JUMP_TABLE_OFFSETS)        \
 140           return "jmp %%pc@(2,%0:l)";                   \
 141         else                                            \
 142           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
 143       }                                                 \
 144     else if (TARGET_LONG_JUMP_TABLE_OFFSETS)            \
 145       return "jmp %%pc@(2,%0:l)";                       \
 146     else                                                \
 147       return "jmp %%pc@(2,%0:w)";                       \
 148   } while (0)
 149
 150
 151 /* This is how to output an assembler line that says to advance the
 152    location counter to a multiple of 2**LOG bytes.  */
 153
 154 #undef ASM_OUTPUT_ALIGN
 155 #define ASM_OUTPUT_ALIGN(FILE,LOG)                                      \
 156 do                                                                      \
 157   {                                                                     \
 158     if ((LOG) > 0)                                                      \
 159       fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));             \
 160   }                                                                     \
 161 while (0)
 162
 163
 164 /* If defined, a C expression whose value is a string containing the
 165    assembler operation to identify the following data as uninitialized global
 166    data.  */
 167
 168 #define BSS_SECTION_ASM_OP      ".section\t.bss"
 169
 170
 171 #undef ASM_OUTPUT_ALIGNED_BSS
 172 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 173   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 174
 175
 176 #undef ASM_OUTPUT_COMMON
 177 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)                    \
 178 ( fputs (".comm ", (FILE)),                                             \
 179   assemble_name ((FILE), (NAME)),                                       \
 180   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 181
 182 #undef ASM_OUTPUT_LOCAL
 183 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)                     \
 184 ( fputs (".lcomm ", (FILE)),                                            \
 185   assemble_name ((FILE), (NAME)),                                       \
 186   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 187
 188
 189 /* XXX
 190    This is the end of the chunk lifted from m68kelf.h  */
 191
 192
 193 /* XXX
 194    The following chunk is more or less lifted from m68kv4.h.
 195    We'd like to just #include that file, but it has not yet
 196    been converted to the new include style.
 197
 198    Should there be a m68kv4-abi.h ??  */
 199
 200
 201 /* Register in which address to store a structure value is passed to a
 202    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */
 203
 204 #undef M68K_STRUCT_VALUE_REGNUM
 205 #define M68K_STRUCT_VALUE_REGNUM A0_REG
 206
 207
 208 /* Register in which static-chain is passed to a function.  The
 209    default isn m68k.h is a0, but that is already the struct value
 210    regnum.  Make it a1 instead.  */
 211
 212 #undef STATIC_CHAIN_REGNUM
 213 #define STATIC_CHAIN_REGNUM A1_REG
 214 #undef M68K_STATIC_CHAIN_REG_NAME
 215 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"
 216
 217
 218 /* Now to renumber registers for dbx and gdb.
 219    We use the Sun-3 convention, which is:
 220    floating point registers have numbers 18 to 25, not
 221    16 to 23 as they do in the compiler.  */
 222
 223 #undef DBX_REGISTER_NUMBER
 224 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
 225
 226
 227 /* 1 if N is a possible register number for a function value.  For
 228    m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
 229    pointer, or floating types, respectively.  Reject fp0 if not using
 230    a 68881 coprocessor.  */
 231
 232 #undef FUNCTION_VALUE_REGNO_P
 233 #define FUNCTION_VALUE_REGNO_P(N)                                       \
 234   ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))
 235
 236
 237 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
 238    more than one register.  */
 239
 240 #undef NEEDS_UNTYPED_CALL
 241 #define NEEDS_UNTYPED_CALL 1
 242
 243
 244 /* Define how to generate (in the callee) the output value of a
 245    function and how to find (in the caller) the value returned by a
 246    function.  VALTYPE is the data type of the value (as a tree).  If
 247    the precise function being called is known, FUNC is its
 248    FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
 249    result in d0, a0, or fp0 as appropriate.  */
 250
 251 #undef FUNCTION_VALUE
 252 #define FUNCTION_VALUE(VALTYPE, FUNC)                                   \
 253   m68k_function_value (VALTYPE, FUNC)
 254
 255
 256 /* Define how to find the value returned by a library function
 257    assuming the value has mode MODE.
 258    For m68k/SVR4 look for integer values in d0, pointer values in d0
 259    (returned in both d0 and a0), and floating values in fp0.  */
 260
 261 #undef LIBCALL_VALUE
 262 #define LIBCALL_VALUE(MODE)                                             \
 263   m68k_libcall_value (MODE)
 264
 265
 266 /* Boundary (in *bits*) on which stack pointer should be aligned.
 267    The m68k/SVR4 convention is to keep the stack pointer longword aligned.  */
 268
 269 #undef STACK_BOUNDARY
 270 #define STACK_BOUNDARY 32
 271
 272
 273 /* Alignment of field after `int : 0' in a structure.
 274    For m68k/SVR4, this is the next longword boundary.  */
 275
 276 #undef EMPTY_FIELD_BOUNDARY
 277 #define EMPTY_FIELD_BOUNDARY 32
 278
 279
 280 /* No data type wants to be aligned rounder than this.
 281    For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
 282    boundaries */
 283
 284 #undef BIGGEST_ALIGNMENT
 285 #define BIGGEST_ALIGNMENT 64
 286
 287
 288 /* The svr4 ABI for the m68k says that records and unions are returned
 289    in memory.  */
 290
 291 #undef DEFAULT_PCC_STRUCT_RETURN
 292 #define DEFAULT_PCC_STRUCT_RETURN 1
 293
 294 /* XXX
 295    This is the end of the chunk lifted from m68kv4.h  */