gcc/config/m68k/m68kelf.h

   1 /* m68kelf support, derived from m68kv4.h */
   2
   3 /* Target definitions for GNU compiler for mc680x0 running System V.4
   4    Copyright (C) 1991, 1993, 2000, 2002, 2003 Free Software Foundation, Inc.
   5
   6    Written by Ron Guilmette (rfg@netcom.com) and Fred Fish (fnf@cygnus.com).
   7
   8 This file is part of GCC.
   9
  10 GCC is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2, or (at your option)
  13 any later version.
  14
  15 GCC is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GCC; see the file COPYING.  If not, write to
  22 the Free Software Foundation, 59 Temple Place - Suite 330,
  23 Boston, MA 02111-1307, USA.  */
  24
  25
  26 #ifndef SWBEG_ASM_OP
  27 #define SWBEG_ASM_OP "\t.swbeg\t"
  28 #endif
  29
  30 /* Here are four prefixes that are used by asm_fprintf to
  31    facilitate customization for alternate assembler syntaxes.
  32    Machines with no likelihood of an alternate syntax need not
  33    define these and need not use asm_fprintf.  */
  34
  35 /* The prefix for register names.  Note that REGISTER_NAMES
  36    is supposed to include this prefix. Also note that this is NOT an
  37    fprintf format string, it is a literal string */
  38
  39 #undef REGISTER_PREFIX
  40 #define REGISTER_PREFIX "%"
  41
  42 /* The prefix for local (compiler generated) labels.
  43    These labels will not appear in the symbol table.  */
  44
  45 #undef LOCAL_LABEL_PREFIX
  46 #define LOCAL_LABEL_PREFIX "."
  47
  48 /* The prefix to add to user-visible assembler symbols.  */
  49
  50 #undef USER_LABEL_PREFIX
  51 #define USER_LABEL_PREFIX ""
  52
  53 /* The prefix for immediate operands.  */
  54
  55 #undef  IMMEDIATE_PREFIX
  56 #define IMMEDIATE_PREFIX "#"
  57
  58 /* In the machine description we can't use %R, because it will not be seen
  59    by ASM_FPRINTF.  (Isn't that a design bug?).  */
  60
  61 #undef REGISTER_PREFIX_MD
  62 #define REGISTER_PREFIX_MD "%%"
  63
  64 /* config/m68k.md has an explicit reference to the program counter,
  65    prefix this by the register prefix.  */
  66
  67 #define ASM_RETURN_CASE_JUMP                            \
  68   do {                                                  \
  69     if (TARGET_COLDFIRE)                                \
  70       {                                                 \
  71         if (ADDRESS_REG_P (operands[0]))                \
  72           return "jmp %%pc@(2,%0:l)";                   \
  73         else                                            \
  74           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
  75       }                                                 \
  76     else                                                \
  77       return "jmp %%pc@(2,%0:w)";                       \
  78   } while (0)
  79
  80 /* How to refer to registers in assembler output.
  81    This sequence is indexed by compiler's hard-register-number.
  82    Motorola format uses different register names than defined
  83    in m68k.h.  */
  84
  85 #undef REGISTER_NAMES
  86
  87 #define REGISTER_NAMES \
  88 {"%d0",   "%d1",   "%d2",   "%d3",   "%d4",   "%d5",   "%d6",   "%d7",       \
  89  "%a0",   "%a1",   "%a2",   "%a3",   "%a4",   "%a5",   "%a6",   "%sp",       \
  90  "%fp0",  "%fp1",  "%fp2",  "%fp3",  "%fp4",  "%fp5",  "%fp6",  "%fp7", "argptr" }
  91
  92 /* This is how to output an assembler line that says to advance the
  93    location counter to a multiple of 2**LOG bytes.  */
  94
  95 #undef ASM_OUTPUT_ALIGN
  96 #define ASM_OUTPUT_ALIGN(FILE,LOG)                              \
  97 do {                                                            \
  98   if ((LOG) > 0)                                                \
  99     fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));       \
 100   else if ((LOG) > 31)                                          \
 101     abort ();                                                   \
 102 } while (0)
 103
 104 /* Use proper assembler syntax for these macros.  */
 105 #undef ASM_OUTPUT_REG_PUSH
 106 #define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
 107   asm_fprintf (FILE, "\t%Omove.l %s,-(%Rsp)\n", reg_names[REGNO])
 108
 109 #undef ASM_OUTPUT_REG_POP
 110 #define ASM_OUTPUT_REG_POP(FILE,REGNO)  \
 111   asm_fprintf (FILE, "\t%Omove.l (%Rsp)+,%s\n", reg_names[REGNO])
 112
 113 /*  Override the definition of NO_DOLLAR_IN_LABEL in svr4.h, for special
 114     g++ assembler names.  When this is defined, g++ uses embedded '.'
 115     characters and some m68k assemblers have problems with this.  The
 116     chances are much greater that any particular assembler will permit
 117     embedded '$' characters.  */
 118
 119 #undef NO_DOLLAR_IN_LABEL
 120
 121 /* Define PCC_STATIC_STRUCT_RETURN if the convention on the target machine
 122    is to use the nonreentrant technique for returning structure and union
 123    values, as commonly implemented by the AT&T Portable C Compiler (PCC).
 124    When defined, the gcc option -fpcc-struct-return can be used to cause
 125    this form to be generated.  When undefined, the option does nothing.
 126    For m68k SVR4, the convention is to use a reentrant technique compatible
 127    with the gcc default, so override the definition of this macro in m68k.h */
 128
 129 #undef PCC_STATIC_STRUCT_RETURN
 130
 131 /* Local common symbols are declared to the assembler with ".lcomm" rather
 132    than ".bss", so override the definition in svr4.h */
 133
 134 #undef BSS_ASM_OP
 135 #define BSS_ASM_OP      "\t.lcomm\t"
 136
 137 /* Register in which address to store a structure value is passed to a
 138    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0.  */
 139
 140 #undef STRUCT_VALUE_REGNUM
 141 #define STRUCT_VALUE_REGNUM 8
 142
 143 #define ASM_COMMENT_START "|"
 144
 145 /* Define how the m68k registers should be numbered for Dwarf output.
 146    The numbering provided here should be compatible with the native
 147    SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
 148    are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23.  */
 149
 150 #undef DBX_REGISTER_NUMBER
 151 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 152
 153 /* The ASM_OUTPUT_SKIP macro is first defined in m68k.h, using ".skip".
 154    It is then overridden by m68k/sgs.h to use ".space", and again by svr4.h
 155    to use ".zero".  The m68k/SVR4 assembler uses ".space", so repeat the
 156    definition from m68k/sgs.h here.  Note that ASM_NO_SKIP_IN_TEXT is
 157    defined in m68k/sgs.h, so we don't have to repeat it here.  */
 158
 159 #undef ASM_OUTPUT_SKIP
 160 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 161   fprintf (FILE, "%s%u\n", SPACE_ASM_OP, (int)(SIZE))
 162
 163 #if 0
 164 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
 165    1 byte alignment. Don't generate alignment for COMMON seems to be
 166    safer until we the assembler is fixed.  */
 167 #undef ASM_OUTPUT_ALIGNED_COMMON
 168 /* Same problem with this one.  */
 169 #undef ASM_OUTPUT_ALIGNED_LOCAL
 170 #endif
 171
 172 /* The `string' directive on m68k svr4 does not handle string with
 173    escape char (ie., `\') right. Use normal way to output ASCII bytes
 174    seems to be safer.  */
 175 #undef ASM_OUTPUT_ASCII
 176 #define ASM_OUTPUT_ASCII(FILE,PTR,LEN)                          \
 177 do {                                                            \
 178   register int sp = 0, ch;                                      \
 179   fputs (integer_asm_op (1, TRUE), (FILE));                     \
 180   do {                                                          \
 181     ch = (PTR)[sp];                                             \
 182     if (ch > ' ' && ! (ch & 0x80) && ch != '\\')                \
 183       {                                                         \
 184         fprintf ((FILE), "'%c", ch);                            \
 185       }                                                         \
 186     else                                                        \
 187       {                                                         \
 188         fprintf ((FILE), "0x%x", ch);                           \
 189       }                                                         \
 190     if (++sp < (LEN))                                           \
 191       {                                                         \
 192         if ((sp % 10) == 0)                                     \
 193           {                                                     \
 194             fprintf ((FILE), "\n%s", integer_asm_op (1, TRUE)); \
 195           }                                                     \
 196         else                                                    \
 197           {                                                     \
 198             putc (',', (FILE));                                 \
 199           }                                                     \
 200       }                                                         \
 201   } while (sp < (LEN));                                         \
 202   putc ('\n', (FILE));                                          \
 203 } while (0)
 204
 205 /* SVR4 m68k assembler is bitching on the syntax `2.b'.
 206    So use the "LLDnnn-LLnnn" format.  Define LLDnnn after the table.  */
 207
 208 #undef ASM_OUTPUT_CASE_END
 209 #define ASM_OUTPUT_CASE_END(FILE,NUM,TABLE)                             \
 210 do {                                                                    \
 211   if (switch_table_difference_label_flag)                               \
 212     asm_fprintf ((FILE), "%s%LLD%d,%LL%d\n", SET_ASM_OP, (NUM), (NUM)); \
 213   switch_table_difference_label_flag = 0;                               \
 214 } while (0)
 215
 216 extern int switch_table_difference_label_flag;
 217
 218 #undef ASM_OUTPUT_COMMON
 219 #undef ASM_OUTPUT_LOCAL
 220 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
 221 ( fputs (".comm ", (FILE)),                     \
 222   assemble_name ((FILE), (NAME)),               \
 223   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 224
 225 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
 226 ( fputs (".lcomm ", (FILE)),                    \
 227   assemble_name ((FILE), (NAME)),               \
 228   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 229
 230 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 231    keep switch tables in the text section.  */
 232
 233 #define JUMP_TABLES_IN_TEXT_SECTION 1
 234
 235 /* Override the definition in svr4.h. In m68k svr4, using swbeg is the
 236    standard way to do switch table.  */
 237 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
 238 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE)             \
 239   fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1));
 240 /* end of stuff from m68kv4.h */
 241
 242 #undef ENDFILE_SPEC
 243 #define ENDFILE_SPEC "crtend.o%s"
 244
 245 #undef  STARTFILE_SPEC
 246 #define STARTFILE_SPEC "crtbegin.o%s"
 247
 248 /* If defined, a C expression whose value is a string containing the
 249    assembler operation to identify the following data as
 250    uninitialized global data.  If not defined, and neither
 251    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
 252    uninitialized global data will be output in the data section if
 253    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
 254    used.  */
 255 #ifndef BSS_SECTION_ASM_OP
 256 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
 257 #endif
 258
 259 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 260    separate, explicit argument.  If you define this macro, it is used
 261    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 262    handling the required alignment of the variable.  The alignment is
 263    specified as the number of bits.
 264
 265    Try to use function `asm_output_aligned_bss' defined in file
 266    `varasm.c' when defining this macro.  */
 267 #ifndef ASM_OUTPUT_ALIGNED_BSS
 268 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 269   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 270 #endif