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, 2007
   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 3, 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 COPYING3.  If not see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25
  26 #ifndef SWBEG_ASM_OP
  27 #define SWBEG_ASM_OP "\t.swbeg\t"
  28 #endif
  29
  30 /* Here are three 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 /* config/m68k.md has an explicit reference to the program counter,
  54    prefix this by the register prefix.  */
  55
  56 #define ASM_RETURN_CASE_JUMP                            \
  57   do {                                                  \
  58     if (TARGET_COLDFIRE)                                \
  59       {                                                 \
  60         if (ADDRESS_REG_P (operands[0]))                \
  61           return "jmp %%pc@(2,%0:l)";                   \
  62         else                                            \
  63           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
  64       }                                                 \
  65     else                                                \
  66       return "jmp %%pc@(2,%0:w)";                       \
  67   } while (0)
  68
  69 /* This is how to output an assembler line that says to advance the
  70    location counter to a multiple of 2**LOG bytes.  */
  71
  72 #undef ASM_OUTPUT_ALIGN
  73 #define ASM_OUTPUT_ALIGN(FILE,LOG)                              \
  74 do {                                                            \
  75   if ((LOG) > 0)                                                \
  76     fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));       \
  77 } while (0)
  78
  79 /* Register in which address to store a structure value is passed to a
  80    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0.  */
  81
  82 #undef M68K_STRUCT_VALUE_REGNUM
  83 #define M68K_STRUCT_VALUE_REGNUM A0_REG
  84
  85 /* The static chain regnum defaults to a0, but we use that for
  86    structure return, so have to use a1 for the static chain.  */
  87
  88 #undef STATIC_CHAIN_REGNUM
  89 #define STATIC_CHAIN_REGNUM A1_REG
  90 #undef M68K_STATIC_CHAIN_REG_NAME
  91 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"
  92
  93 #define ASM_COMMENT_START "|"
  94
  95 /* Define how the m68k registers should be numbered for Dwarf output.
  96    The numbering provided here should be compatible with the native
  97    SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
  98    are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23.  */
  99
 100 #undef DBX_REGISTER_NUMBER
 101 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 102
 103 #if 0
 104 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
 105    1 byte alignment. Don't generate alignment for COMMON seems to be
 106    safer until we the assembler is fixed.  */
 107 #undef ASM_OUTPUT_ALIGNED_COMMON
 108 /* Same problem with this one.  */
 109 #undef ASM_OUTPUT_ALIGNED_LOCAL
 110 #endif
 111
 112 #undef ASM_OUTPUT_COMMON
 113 #undef ASM_OUTPUT_LOCAL
 114 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
 115 ( fputs (".comm ", (FILE)),                     \
 116   assemble_name ((FILE), (NAME)),               \
 117   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 118
 119 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
 120 ( fputs (".lcomm ", (FILE)),                    \
 121   assemble_name ((FILE), (NAME)),               \
 122   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 123
 124 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 125    keep switch tables in the text section.  */
 126
 127 #define JUMP_TABLES_IN_TEXT_SECTION 1
 128
 129 /* Override the definition in svr4.h. In m68k svr4, using swbeg is the
 130    standard way to do switch table.  */
 131 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
 132 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE)             \
 133   fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1));
 134 /* end of stuff from m68kv4.h */
 135
 136 #undef ENDFILE_SPEC
 137 #define ENDFILE_SPEC "crtend.o%s"
 138
 139 #undef  STARTFILE_SPEC
 140 #define STARTFILE_SPEC "crtbegin.o%s"
 141
 142 /* If defined, a C expression whose value is a string containing the
 143    assembler operation to identify the following data as
 144    uninitialized global data.  If not defined, and neither
 145    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
 146    uninitialized global data will be output in the data section if
 147    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
 148    used.  */
 149 #ifndef BSS_SECTION_ASM_OP
 150 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
 151 #endif
 152
 153 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 154    separate, explicit argument.  If you define this macro, it is used
 155    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 156    handling the required alignment of the variable.  The alignment is
 157    specified as the number of bits.
 158
 159    Try to use function `asm_output_aligned_bss' defined in file
 160    `varasm.c' when defining this macro.  */
 161 #ifndef ASM_OUTPUT_ALIGNED_BSS
 162 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 163   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 164 #endif