old-autovect-branch/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, 2004
   5    Free Software Foundation, Inc.
   6
   7    Written by Ron Guilmette (rfg@netcom.com) and Fred Fish (fnf@cygnus.com).
   8
   9 This file is part of GCC.
  10
  11 GCC is free software; you can redistribute it and/or modify
  12 it under the terms of the GNU General Public License as published by
  13 the Free Software Foundation; either version 2, or (at your option)
  14 any later version.
  15
  16 GCC is distributed in the hope that it will be useful,
  17 but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 GNU General Public License for more details.
  20
  21 You should have received a copy of the GNU General Public License
  22 along with GCC; see the file COPYING.  If not, write to
  23 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  24 Boston, MA 02110-1301, USA.  */
  25
  26
  27 #ifndef SWBEG_ASM_OP
  28 #define SWBEG_ASM_OP "\t.swbeg\t"
  29 #endif
  30
  31 /* Here are four prefixes that are used by asm_fprintf to
  32    facilitate customization for alternate assembler syntaxes.
  33    Machines with no likelihood of an alternate syntax need not
  34    define these and need not use asm_fprintf.  */
  35
  36 /* The prefix for register names.  Note that REGISTER_NAMES
  37    is supposed to include this prefix. Also note that this is NOT an
  38    fprintf format string, it is a literal string */
  39
  40 #undef REGISTER_PREFIX
  41 #define REGISTER_PREFIX "%"
  42
  43 /* The prefix for local (compiler generated) labels.
  44    These labels will not appear in the symbol table.  */
  45
  46 #undef LOCAL_LABEL_PREFIX
  47 #define LOCAL_LABEL_PREFIX "."
  48
  49 /* The prefix to add to user-visible assembler symbols.  */
  50
  51 #undef USER_LABEL_PREFIX
  52 #define USER_LABEL_PREFIX ""
  53
  54 /* The prefix for immediate operands.  */
  55
  56 #undef  IMMEDIATE_PREFIX
  57 #define IMMEDIATE_PREFIX "#"
  58
  59 /* In the machine description we can't use %R, because it will not be seen
  60    by ASM_FPRINTF.  (Isn't that a design bug?).  */
  61
  62 #undef REGISTER_PREFIX_MD
  63 #define REGISTER_PREFIX_MD "%%"
  64
  65 /* config/m68k.md has an explicit reference to the program counter,
  66    prefix this by the register prefix.  */
  67
  68 #define ASM_RETURN_CASE_JUMP                            \
  69   do {                                                  \
  70     if (TARGET_COLDFIRE)                                \
  71       {                                                 \
  72         if (ADDRESS_REG_P (operands[0]))                \
  73           return "jmp %%pc@(2,%0:l)";                   \
  74         else                                            \
  75           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
  76       }                                                 \
  77     else                                                \
  78       return "jmp %%pc@(2,%0:w)";                       \
  79   } while (0)
  80
  81 /* This is how to output an assembler line that says to advance the
  82    location counter to a multiple of 2**LOG bytes.  */
  83
  84 #undef ASM_OUTPUT_ALIGN
  85 #define ASM_OUTPUT_ALIGN(FILE,LOG)                              \
  86 do {                                                            \
  87   if ((LOG) > 0)                                                \
  88     fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));       \
  89 } while (0)
  90
  91 /* Use proper assembler syntax for these macros.  */
  92 #undef ASM_OUTPUT_REG_PUSH
  93 #define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
  94   asm_fprintf (FILE, "\t%Omove.l %s,-(%Rsp)\n", reg_names[REGNO])
  95
  96 #undef ASM_OUTPUT_REG_POP
  97 #define ASM_OUTPUT_REG_POP(FILE,REGNO)  \
  98   asm_fprintf (FILE, "\t%Omove.l (%Rsp)+,%s\n", reg_names[REGNO])
  99
 100 /*  Override the definition of NO_DOLLAR_IN_LABEL in svr4.h, for special
 101     g++ assembler names.  When this is defined, g++ uses embedded '.'
 102     characters and some m68k assemblers have problems with this.  The
 103     chances are much greater that any particular assembler will permit
 104     embedded '$' characters.  */
 105
 106 #undef NO_DOLLAR_IN_LABEL
 107
 108 /* Define PCC_STATIC_STRUCT_RETURN if the convention on the target machine
 109    is to use the nonreentrant technique for returning structure and union
 110    values, as commonly implemented by the AT&T Portable C Compiler (PCC).
 111    When defined, the gcc option -fpcc-struct-return can be used to cause
 112    this form to be generated.  When undefined, the option does nothing.
 113    For m68k SVR4, the convention is to use a reentrant technique compatible
 114    with the gcc default, so override the definition of this macro in m68k.h */
 115
 116 #undef PCC_STATIC_STRUCT_RETURN
 117
 118 /* Local common symbols are declared to the assembler with ".lcomm" rather
 119    than ".bss", so override the definition in svr4.h */
 120
 121 #undef BSS_ASM_OP
 122 #define BSS_ASM_OP      "\t.lcomm\t"
 123
 124 /* Register in which address to store a structure value is passed to a
 125    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0.  */
 126
 127 #undef M68K_STRUCT_VALUE_REGNUM
 128 #define M68K_STRUCT_VALUE_REGNUM 8
 129
 130 #define ASM_COMMENT_START "|"
 131
 132 /* Define how the m68k registers should be numbered for Dwarf output.
 133    The numbering provided here should be compatible with the native
 134    SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
 135    are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23.  */
 136
 137 #undef DBX_REGISTER_NUMBER
 138 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 139
 140 /* The ASM_OUTPUT_SKIP macro is first defined in m68k.h, using ".skip".
 141    It is then overridden by m68k/sgs.h to use ".space", and again by svr4.h
 142    to use ".zero".  The m68k/SVR4 assembler uses ".space", so repeat the
 143    definition from m68k/sgs.h here.  Note that ASM_NO_SKIP_IN_TEXT is
 144    defined in m68k/sgs.h, so we don't have to repeat it here.  */
 145
 146 #undef ASM_OUTPUT_SKIP
 147 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 148   fprintf (FILE, "%s%u\n", SPACE_ASM_OP, (int)(SIZE))
 149
 150 #if 0
 151 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
 152    1 byte alignment. Don't generate alignment for COMMON seems to be
 153    safer until we the assembler is fixed.  */
 154 #undef ASM_OUTPUT_ALIGNED_COMMON
 155 /* Same problem with this one.  */
 156 #undef ASM_OUTPUT_ALIGNED_LOCAL
 157 #endif
 158
 159 /* The `string' directive on m68k svr4 does not handle string with
 160    escape char (i.e., `\') right. Use normal way to output ASCII bytes
 161    seems to be safer.  */
 162 #undef ASM_OUTPUT_ASCII
 163 #define ASM_OUTPUT_ASCII(FILE,PTR,LEN)                          \
 164 do {                                                            \
 165   register int sp = 0, ch;                                      \
 166   fputs (integer_asm_op (1, TRUE), (FILE));                     \
 167   do {                                                          \
 168     ch = (PTR)[sp];                                             \
 169     if (ch > ' ' && ! (ch & 0x80) && ch != '\\')                \
 170       {                                                         \
 171         fprintf ((FILE), "'%c", ch);                            \
 172       }                                                         \
 173     else                                                        \
 174       {                                                         \
 175         fprintf ((FILE), "0x%x", ch);                           \
 176       }                                                         \
 177     if (++sp < (LEN))                                           \
 178       {                                                         \
 179         if ((sp % 10) == 0)                                     \
 180           {                                                     \
 181             fprintf ((FILE), "\n%s", integer_asm_op (1, TRUE)); \
 182           }                                                     \
 183         else                                                    \
 184           {                                                     \
 185             putc (',', (FILE));                                 \
 186           }                                                     \
 187       }                                                         \
 188   } while (sp < (LEN));                                         \
 189   putc ('\n', (FILE));                                          \
 190 } while (0)
 191
 192 #undef ASM_OUTPUT_COMMON
 193 #undef ASM_OUTPUT_LOCAL
 194 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
 195 ( fputs (".comm ", (FILE)),                     \
 196   assemble_name ((FILE), (NAME)),               \
 197   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 198
 199 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
 200 ( fputs (".lcomm ", (FILE)),                    \
 201   assemble_name ((FILE), (NAME)),               \
 202   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 203
 204 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 205    keep switch tables in the text section.  */
 206
 207 #define JUMP_TABLES_IN_TEXT_SECTION 1
 208
 209 /* Override the definition in svr4.h. In m68k svr4, using swbeg is the
 210    standard way to do switch table.  */
 211 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
 212 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE)             \
 213   fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1));
 214 /* end of stuff from m68kv4.h */
 215
 216 #undef ENDFILE_SPEC
 217 #define ENDFILE_SPEC "crtend.o%s"
 218
 219 #undef  STARTFILE_SPEC
 220 #define STARTFILE_SPEC "crtbegin.o%s"
 221
 222 /* If defined, a C expression whose value is a string containing the
 223    assembler operation to identify the following data as
 224    uninitialized global data.  If not defined, and neither
 225    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
 226    uninitialized global data will be output in the data section if
 227    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
 228    used.  */
 229 #ifndef BSS_SECTION_ASM_OP
 230 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
 231 #endif
 232
 233 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 234    separate, explicit argument.  If you define this macro, it is used
 235    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 236    handling the required alignment of the variable.  The alignment is
 237    specified as the number of bits.
 238
 239    Try to use function `asm_output_aligned_bss' defined in file
 240    `varasm.c' when defining this macro.  */
 241 #ifndef ASM_OUTPUT_ALIGNED_BSS
 242 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 243   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 244 #endif