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) 1991-2020 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 3, 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 COPYING3.  If not see
  22 <http://www.gnu.org/licenses/>.  */
  23
  24
  25 #ifndef SWBEG_ASM_OP
  26 #define SWBEG_ASM_OP "\t.swbeg\t"
  27 #endif
  28
  29 /* Here are three prefixes that are used by asm_fprintf to
  30    facilitate customization for alternate assembler syntaxes.
  31    Machines with no likelihood of an alternate syntax need not
  32    define these and need not use asm_fprintf.  */
  33
  34 /* The prefix for register names.  Note that REGISTER_NAMES
  35    is supposed to include this prefix. Also note that this is NOT an
  36    fprintf format string, it is a literal string */
  37
  38 #undef REGISTER_PREFIX
  39 #define REGISTER_PREFIX "%"
  40
  41 /* The prefix for local (compiler generated) labels.
  42    These labels will not appear in the symbol table.  */
  43
  44 #undef LOCAL_LABEL_PREFIX
  45 #define LOCAL_LABEL_PREFIX "."
  46
  47 /* The prefix to add to user-visible assembler symbols.  */
  48
  49 #undef USER_LABEL_PREFIX
  50 #define USER_LABEL_PREFIX ""
  51
  52 /* config/m68k.md has an explicit reference to the program counter,
  53    prefix this by the register prefix.  */
  54
  55 #define ASM_RETURN_CASE_JUMP                            \
  56   do {                                                  \
  57     if (TARGET_COLDFIRE)                                \
  58       {                                                 \
  59         if (ADDRESS_REG_P (operands[0]))                \
  60           return "jmp %%pc@(2,%0:l)";                   \
  61         else if (TARGET_LONG_JUMP_TABLE_OFFSETS)        \
  62           return "jmp %%pc@(2,%0:l)";                   \
  63         else                                            \
  64           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
  65       }                                                 \
  66     else if (TARGET_LONG_JUMP_TABLE_OFFSETS)            \
  67       return "jmp %%pc@(2,%0:l)";                       \
  68     else                                                \
  69       return "jmp %%pc@(2,%0:w)";                       \
  70   } while (0)
  71
  72 /* This is how to output an assembler line that says to advance the
  73    location counter to a multiple of 2**LOG bytes.  */
  74
  75 #undef ASM_OUTPUT_ALIGN
  76 #define ASM_OUTPUT_ALIGN(FILE,LOG)                              \
  77 do {                                                            \
  78   if ((LOG) > 0)                                                \
  79     fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));       \
  80 } while (0)
  81
  82 /* Register in which address to store a structure value is passed to a
  83    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0.  */
  84
  85 #undef M68K_STRUCT_VALUE_REGNUM
  86 #define M68K_STRUCT_VALUE_REGNUM A0_REG
  87
  88 /* The static chain regnum defaults to a0, but we use that for
  89    structure return, so have to use a1 for the static chain.  */
  90
  91 #undef STATIC_CHAIN_REGNUM
  92 #define STATIC_CHAIN_REGNUM A1_REG
  93 #undef M68K_STATIC_CHAIN_REG_NAME
  94 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"
  95
  96 #define ASM_COMMENT_START "|"
  97
  98 /* Define how the m68k registers should be numbered for Dwarf output.
  99    The numbering provided here should be compatible with the native
 100    SVR4 debugger in the m68k/SVR4 reference port, where d0-d7
 101    are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23.  */
 102
 103 #undef DBX_REGISTER_NUMBER
 104 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 105
 106 #if 0
 107 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
 108    1 byte alignment. Don't generate alignment for COMMON seems to be
 109    safer until we the assembler is fixed.  */
 110 #undef ASM_OUTPUT_ALIGNED_COMMON
 111 /* Same problem with this one.  */
 112 #undef ASM_OUTPUT_ALIGNED_LOCAL
 113 #endif
 114
 115 #undef ASM_OUTPUT_COMMON
 116 #undef ASM_OUTPUT_LOCAL
 117 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
 118 ( fputs (".comm ", (FILE)),                     \
 119   assemble_name ((FILE), (NAME)),               \
 120   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 121
 122 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
 123 ( fputs (".lcomm ", (FILE)),                    \
 124   assemble_name ((FILE), (NAME)),               \
 125   fprintf ((FILE), ",%u\n", (int)(SIZE)))
 126
 127 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
 128    keep switch tables in the text section.  */
 129
 130 #define JUMP_TABLES_IN_TEXT_SECTION 1
 131
 132 /* In m68k svr4, using swbeg is the standard way to do switch
 133    table.  */
 134 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
 135 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE)             \
 136   fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1))
 137 /* end of stuff from m68kv4.h */
 138
 139 #undef ENDFILE_SPEC
 140 #define ENDFILE_SPEC "crtend.o%s"
 141
 142 #undef  STARTFILE_SPEC
 143 #define STARTFILE_SPEC "crtbegin.o%s"
 144
 145 #ifndef BSS_SECTION_ASM_OP
 146 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
 147 #endif
 148
 149 #ifndef ASM_OUTPUT_ALIGNED_BSS
 150 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 151   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 152 #endif