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 three 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 /* config/m68k.md has an explicit reference to the program counter,
  55    prefix this by the register prefix.  */
  56
  57 #define ASM_RETURN_CASE_JUMP                            \
  58   do {                                                  \
  59     if (TARGET_COLDFIRE)                                \
  60       {                                                 \
  61         if (ADDRESS_REG_P (operands[0]))                \
  62           return "jmp %%pc@(2,%0:l)";                   \
  63         else                                            \
  64           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
  65       }                                                 \
  66     else                                                \
  67       return "jmp %%pc@(2,%0:w)";                       \
  68   } while (0)
  69
  70 /* This is how to output an assembler line that says to advance the
  71    location counter to a multiple of 2**LOG bytes.  */
  72
  73 #undef ASM_OUTPUT_ALIGN
  74 #define ASM_OUTPUT_ALIGN(FILE,LOG)                              \
  75 do {                                                            \
  76   if ((LOG) > 0)                                                \
  77     fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));       \
  78 } while (0)
  79
  80 /* Register in which address to store a structure value is passed to a
  81    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0.  */
  82
  83 #undef M68K_STRUCT_VALUE_REGNUM
  84 #define M68K_STRUCT_VALUE_REGNUM A0_REG
  85
  86 /* The static chain regnum defaults to a0, but we use that for
  87    structure return, so have to use a1 for the static chain.  */
  88
  89 #undef STATIC_CHAIN_REGNUM
  90 #define STATIC_CHAIN_REGNUM A1_REG
  91 #undef M68K_STATIC_CHAIN_REG_NAME
  92 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"
  93
  94 #define ASM_COMMENT_START "|"
  95
  96 /* Define how the m68k registers should be numbered for Dwarf output.
  97    The numbering provided here should be compatible with the native
  98    SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
  99    are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23.  */
 100
 101 #undef DBX_REGISTER_NUMBER
 102 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 103
 104 #if 0
 105 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
 106    1 byte alignment. Don't generate alignment for COMMON seems to be
 107    safer until we the assembler is fixed.  */
 108 #undef ASM_OUTPUT_ALIGNED_COMMON
 109 /* Same problem with this one.  */
 110 #undef ASM_OUTPUT_ALIGNED_LOCAL
 111 #endif
 112
 113 #undef ASM_OUTPUT_COMMON
 114 #undef ASM_OUTPUT_LOCAL
 115 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
 116 ( fputs (".comm ", (FILE)),                     \
 117   assemble_name ((FILE), (NAME)),               \
 118   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 119
 120 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
 121 ( fputs (".lcomm ", (FILE)),                    \
 122   assemble_name ((FILE), (NAME)),               \
 123   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 124
 125 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 126    keep switch tables in the text section.  */
 127
 128 #define JUMP_TABLES_IN_TEXT_SECTION 1
 129
 130 /* Override the definition in svr4.h. In m68k svr4, using swbeg is the
 131    standard way to do switch table.  */
 132 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
 133 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE)             \
 134   fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1));
 135 /* end of stuff from m68kv4.h */
 136
 137 #undef ENDFILE_SPEC
 138 #define ENDFILE_SPEC "crtend.o%s"
 139
 140 #undef  STARTFILE_SPEC
 141 #define STARTFILE_SPEC "crtbegin.o%s"
 142
 143 /* If defined, a C expression whose value is a string containing the
 144    assembler operation to identify the following data as
 145    uninitialized global data.  If not defined, and neither
 146    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
 147    uninitialized global data will be output in the data section if
 148    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
 149    used.  */
 150 #ifndef BSS_SECTION_ASM_OP
 151 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
 152 #endif
 153
 154 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 155    separate, explicit argument.  If you define this macro, it is used
 156    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 157    handling the required alignment of the variable.  The alignment is
 158    specified as the number of bits.
 159
 160    Try to use function `asm_output_aligned_bss' defined in file
 161    `varasm.c' when defining this macro.  */
 162 #ifndef ASM_OUTPUT_ALIGNED_BSS
 163 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 164   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 165 #endif