gcc/config/i860/sysv3.h

   1 /* Target definitions for GNU compiler for Intel 80860 running System V.3
   2    Copyright (C) 1991 Free Software Foundation, Inc.
   3
   4    Written by Ron Guilmette (rfg@ncd.com).
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 #include "i860/i860.h"
  23 #include "svr3.h"
  24
  25 #undef TARGET_VERSION
  26 #define TARGET_VERSION fprintf (stderr, " (i860, System V Release 3)")
  27
  28 /* Provide a set of pre-definitions and pre-assertions appropriate for
  29    the i860 running svr3.  */
  30 #define CPP_PREDEFINES "-Di860 -Dunix -D__svr3__"
  31
  32 /* Use crt1.o as a startup file and crtn.o as a closing file.  */
  33
  34 #define STARTFILE_SPEC  \
  35   "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
  36
  37 #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
  38
  39 /* Special flags for the linker.  I don't know what they do.  */
  40
  41 #define LINK_SPEC "%{T*} %{z:-lm}"
  42
  43 /* The prefix to be used in assembler output for all names of registers.
  44    None is needed in V.3.  */
  45
  46 #define I860_REG_PREFIX ""
  47
  48 /* Delimiter that starts comments in the assembler code.  */
  49
  50 #define ASM_COMMENT_START "//"
  51
  52 /* Don't renumber the regusters for debugger output.  */
  53
  54 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
  55
  56 /* Output the special word the System V SDB wants to see just before
  57    the first word of each function's prologue code.  */
  58
  59 extern char *current_function_original_name;
  60
  61 /* This special macro is used to output a magic word just before the
  62    first word of each function.  On some versions of UNIX running on
  63    the i860, this word can be any word that looks like a NOP, however
  64    under svr4, this neds to be an `shr r0,r0,r0' instruction in which
  65    the normally unused low-order bits contain the length of the function
  66    prologue code (in bytes).  This is needed to make the System V SDB
  67    debugger happy.  */
  68
  69 #undef ASM_OUTPUT_FUNCTION_PREFIX
  70 #define ASM_OUTPUT_FUNCTION_PREFIX(FILE, FNNAME)                        \
  71   do {  ASM_OUTPUT_ALIGN (FILE, 2);                                     \
  72         fprintf ((FILE), "\t.long\t.ep.");                              \
  73         assemble_name (FILE, FNNAME);                                   \
  74         fprintf (FILE, "-");                                            \
  75         assemble_name (FILE, FNNAME);                                   \
  76         fprintf (FILE, "+0xc8000000\n");                                \
  77         current_function_original_name = (FNNAME);                      \
  78   } while (0)
  79
  80 /* Output the special label that must go just after each function's
  81    prologue code to support svr4 SDB.  */
  82
  83 #define ASM_OUTPUT_PROLOGUE_SUFFIX(FILE)                                \
  84   do {  fprintf (FILE, ".ep.");                                         \
  85         assemble_name (FILE, current_function_original_name);           \
  86         fprintf (FILE, ":\n");                                          \
  87   } while (0)
  88
  89 /* This says how to output an assembler line
  90    to define a local common symbol.
  91    The difference from svr3.h is we don't limit align to 2.  */
  92
  93 #undef ASM_OUTPUT_LOCAL
  94 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
  95   do {                                                  \
  96     int align = exact_log2 (ROUNDED);                   \
  97     data_section ();                                    \
  98     ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
  99     ASM_OUTPUT_LABEL ((FILE), (NAME));                  \
 100     fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED));     \
 101   } while (0)
 102
 103 /* The routine used to output string literals.
 104
 105 #define ASCII_DATA_ASM_OP       ".byte"
 106
 107 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
 108   do                                                                    \
 109     {                                                                   \
 110       register unsigned char *str = (unsigned char *) (STR);            \
 111       register unsigned char *limit = str + (LENGTH);                   \
 112       register unsigned bytes_in_chunk = 0;                             \
 113       for (; str < limit; str++)                                        \
 114         {                                                               \
 115           register unsigned ch = *str;                                  \
 116           if (ch < 32 || ch == '\\' || ch == '"' || ch >= 127)          \
 117             {                                                           \
 118               if (bytes_in_chunk > 0)                                   \
 119                 {                                                       \
 120                   fprintf ((FILE), "\"\n");                             \
 121                   bytes_in_chunk = 0;                                   \
 122                 }                                                       \
 123               fprintf ((FILE), "\t%s\t%d\n", ASM_BYTE_OP, ch);          \
 124             }                                                           \
 125           else                                                          \
 126             {                                                           \
 127               if (bytes_in_chunk >= 60)                                 \
 128                 {                                                       \
 129                   fprintf ((FILE), "\"\n");                             \
 130                   bytes_in_chunk = 0;                                   \
 131                 }                                                       \
 132               if (bytes_in_chunk == 0)                                  \
 133                 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP);        \
 134               putc (ch, (FILE));                                        \
 135               bytes_in_chunk++;                                         \
 136             }                                                           \
 137         }                                                               \
 138       if (bytes_in_chunk > 0)                                           \
 139         fprintf ((FILE), "\"\n");                                       \
 140     }                                                                   \
 141   while (0)
 142
 143
 144 #undef CTORS_SECTION_ASM_OP
 145 #define CTORS_SECTION_ASM_OP    ".section\t.ctors,\"x\""
 146 #undef DTORS_SECTION_ASM_OP
 147 #define DTORS_SECTION_ASM_OP    ".section\t.dtors,\"x\""
 148
 149 /* Add definitions to support the .tdesc section as specified in the svr4
 150    ABI for the i860.  */
 151
 152 #define TDESC_SECTION_ASM_OP    ".section\t.tdesc"
 153
 154 #undef EXTRA_SECTIONS
 155 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors, in_tdesc
 156
 157 #undef EXTRA_SECTION_FUNCTIONS
 158 #define EXTRA_SECTION_FUNCTIONS                                         \
 159   CONST_SECTION_FUNCTION                                                \
 160   CTORS_SECTION_FUNCTION                                                \
 161   DTORS_SECTION_FUNCTION                                                \
 162   TDESC_SECTION_FUNCTION
 163
 164 #define TDESC_SECTION_FUNCTION                                          \
 165 void                                                                    \
 166 tdesc_section ()                                                        \
 167 {                                                                       \
 168   if (in_section != in_tdesc)                                           \
 169     {                                                                   \
 170       fprintf (asm_out_file, "%s\n", TDESC_SECTION_ASM_OP);             \
 171       in_section = in_tdesc;                                            \
 172     }                                                                   \
 173 }
 174
 175 /* Enable the `const' section that svr3.h defines how to use.  */
 176 #undef USE_CONST_SECTION
 177 #define USE_CONST_SECTION       1