gcc/config/i860/sysv3.h

   1 /* Target definitions for GNU compiler for Intel 80860 running System V.3
   2    Copyright (C) 1991, 1996 Free Software Foundation, Inc.
   3    Contributed by Ron Guilmette (rfg@monkeys.com).
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #undef TARGET_VERSION
  23 #define TARGET_VERSION fprintf (stderr, " (i860, System V Release 3)")
  24
  25 /* Provide a set of pre-definitions and pre-assertions appropriate for
  26    the i860 running svr3.  */
  27 #define CPP_PREDEFINES "-Di860 -Dunix -D__svr3__ -Asystem(unix) -Asystem(svr3) -Acpu(i860) -Amachine(i860)"
  28
  29 /* Use crt1.o as a startup file and crtn.o as a closing file.  */
  30
  31 #define STARTFILE_SPEC  \
  32   "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
  33
  34 #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
  35
  36 /* Special flags for the linker.  I don't know what they do.  */
  37
  38 #define LINK_SPEC "%{T*} %{z:-lm}"
  39
  40 /* The prefix to be used in assembler output for all names of registers.
  41    None is needed in V.3.  */
  42
  43 #define I860_REG_PREFIX ""
  44
  45 /* Delimiter that starts comments in the assembler code.  */
  46
  47 #define ASM_COMMENT_START "//"
  48
  49 /* Don't renumber the regusters for debugger output.  */
  50
  51 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
  52
  53 /* Output the special word the System V SDB wants to see just before
  54    the first word of each function's prologue code.  */
  55
  56 extern char *current_function_original_name;
  57
  58 /* This special macro is used to output a magic word just before the
  59    first word of each function.  On some versions of UNIX running on
  60    the i860, this word can be any word that looks like a NOP, however
  61    under svr4, this neds to be an `shr r0,r0,r0' instruction in which
  62    the normally unused low-order bits contain the length of the function
  63    prologue code (in bytes).  This is needed to make the System V SDB
  64    debugger happy.  */
  65
  66 #undef ASM_OUTPUT_FUNCTION_PREFIX
  67 #define ASM_OUTPUT_FUNCTION_PREFIX(FILE, FNNAME)                        \
  68   do {  ASM_OUTPUT_ALIGN (FILE, 2);                                     \
  69         fprintf ((FILE), "\t.long\t.ep.");                              \
  70         assemble_name (FILE, FNNAME);                                   \
  71         fprintf (FILE, "-");                                            \
  72         assemble_name (FILE, FNNAME);                                   \
  73         fprintf (FILE, "+0xc8000000\n");                                \
  74         current_function_original_name = (FNNAME);                      \
  75   } while (0)
  76
  77 /* Output the special label that must go just after each function's
  78    prologue code to support svr4 SDB.  */
  79
  80 #define ASM_OUTPUT_PROLOGUE_SUFFIX(FILE)                                \
  81   do {  fprintf (FILE, ".ep.");                                         \
  82         assemble_name (FILE, current_function_original_name);           \
  83         fprintf (FILE, ":\n");                                          \
  84   } while (0)
  85
  86 /* This says how to output an assembler line
  87    to define a local common symbol.
  88    The difference from svr3.h is we don't limit align to 2.  */
  89
  90 #undef ASM_OUTPUT_LOCAL
  91 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
  92   do {                                                  \
  93     int align = exact_log2 (ROUNDED);                   \
  94     data_section ();                                    \
  95     ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
  96     ASM_OUTPUT_LABEL ((FILE), (NAME));                  \
  97     fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED));     \
  98   } while (0)
  99
 100 /* The routine used to output string literals.
 101
 102 #define ASCII_DATA_ASM_OP       ".byte"
 103
 104 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
 105   do                                                                    \
 106     {                                                                   \
 107       register unsigned char *str = (unsigned char *) (STR);            \
 108       register unsigned char *limit = str + (LENGTH);                   \
 109       register unsigned bytes_in_chunk = 0;                             \
 110       for (; str < limit; str++)                                        \
 111         {                                                               \
 112           register unsigned ch = *str;                                  \
 113           if (ch < 32 || ch == '\\' || ch == '"' || ch >= 127)          \
 114             {                                                           \
 115               if (bytes_in_chunk > 0)                                   \
 116                 {                                                       \
 117                   fprintf ((FILE), "\"\n");                             \
 118                   bytes_in_chunk = 0;                                   \
 119                 }                                                       \
 120               fprintf ((FILE), "\t%s\t%d\n", ASM_BYTE_OP, ch);          \
 121             }                                                           \
 122           else                                                          \
 123             {                                                           \
 124               if (bytes_in_chunk >= 60)                                 \
 125                 {                                                       \
 126                   fprintf ((FILE), "\"\n");                             \
 127                   bytes_in_chunk = 0;                                   \
 128                 }                                                       \
 129               if (bytes_in_chunk == 0)                                  \
 130                 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP);        \
 131               putc (ch, (FILE));                                        \
 132               bytes_in_chunk++;                                         \
 133             }                                                           \
 134         }                                                               \
 135       if (bytes_in_chunk > 0)                                           \
 136         fprintf ((FILE), "\"\n");                                       \
 137     }                                                                   \
 138   while (0)
 139
 140
 141 #undef CTORS_SECTION_ASM_OP
 142 #define CTORS_SECTION_ASM_OP    ".section\t.ctors,\"x\""
 143 #undef DTORS_SECTION_ASM_OP
 144 #define DTORS_SECTION_ASM_OP    ".section\t.dtors,\"x\""
 145
 146 /* Add definitions to support the .tdesc section as specified in the svr4
 147    ABI for the i860.  */
 148
 149 #define TDESC_SECTION_ASM_OP    ".section\t.tdesc"
 150
 151 #undef EXTRA_SECTIONS
 152 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors, in_tdesc
 153
 154 #undef EXTRA_SECTION_FUNCTIONS
 155 #define EXTRA_SECTION_FUNCTIONS                                         \
 156   CONST_SECTION_FUNCTION                                                \
 157   CTORS_SECTION_FUNCTION                                                \
 158   DTORS_SECTION_FUNCTION                                                \
 159   TDESC_SECTION_FUNCTION
 160
 161 #define TDESC_SECTION_FUNCTION                                          \
 162 void                                                                    \
 163 tdesc_section ()                                                        \
 164 {                                                                       \
 165   if (in_section != in_tdesc)                                           \
 166     {                                                                   \
 167       fprintf (asm_out_file, "%s\n", TDESC_SECTION_ASM_OP);             \
 168       in_section = in_tdesc;                                            \
 169     }                                                                   \
 170 }
 171
 172 /* Enable the `const' section that svr3.h defines how to use.  */
 173 #undef USE_CONST_SECTION
 174 #define USE_CONST_SECTION       1