gcc/config/i860/sysv4.h

   1 /* Target definitions for GNU compiler for Intel 80860 running System V.4
   2    Copyright (C) 1991, 1996, 2000, 2002 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 4)");
  24
  25 /* Provide a set of pre-definitions and pre-assertions appropriate for
  26    the i860 running svr4.  Note that the symbol `__svr4__' MUST BE
  27    DEFINED!  It is needed so that the va_list struct in va-i860.h
  28    will get correctly defined for the svr4 (ABI compliant) case rather
  29    than for the previous (svr3, svr2, ...) case.  It also needs to be
  30    defined so that the correct (svr4) version of __builtin_saveregs
  31    will be selected when we are building gnulib2.c.
  32    __svr4__ is our extension.  */
  33
  34 #define CPP_PREDEFINES \
  35   "-Di860 -Dunix -DSVR4 -D__svr4__ -Asystem=unix -Asystem=svr4 -Acpu=i860 -Amachine=i860"
  36
  37 /* For the benefit of i860_va_arg, flag it this way too.  */
  38
  39 #define I860_SVR4_VA_LIST 1
  40
  41 /* The prefix to be used in assembler output for all names of registers.
  42    This string gets prepended to all i860 register names (svr4 only).  */
  43
  44 #define I860_REG_PREFIX "%"
  45
  46 #define ASM_COMMENT_START "#"
  47
  48 #undef TYPE_OPERAND_FMT
  49 #define TYPE_OPERAND_FMT      "\"%s\""
  50
  51 /* The following macro definition overrides the one in i860.h
  52    because the svr4 i860 assembler requires a different syntax
  53    for getting parts of constant/relocatable values.  */
  54
  55 #undef PRINT_OPERAND_PART
  56 #define PRINT_OPERAND_PART(FILE, X, PART_CODE)                          \
  57   do { fprintf (FILE, "[");                                             \
  58         output_address (X);                                             \
  59         fprintf (FILE, "]@%s", PART_CODE);                              \
  60   } while (0)
  61
  62 #undef ASM_FILE_START
  63 #define ASM_FILE_START(FILE)                                            \
  64   do {  output_file_directive (FILE, main_input_filename);              \
  65         fprintf (FILE, "\t.version\t\"01.01\"\n");                      \
  66   } while (0)
  67
  68 /* Output the special word the svr4 SDB wants to see just before
  69    the first word of each function's prologue code.  */
  70
  71 extern const char *current_function_original_name;
  72
  73 /* This special macro is used to output a magic word just before the
  74    first word of each function.  On some versions of UNIX running on
  75    the i860, this word can be any word that looks like a NOP, however
  76    under svr4, this neds to be an `shr r0,r0,r0' instruction in which
  77    the normally unused low-order bits contain the length of the function
  78    prologue code (in bytes).  This is needed to make the svr4 SDB debugger
  79    happy.  */
  80
  81 #undef ASM_OUTPUT_FUNCTION_PREFIX
  82 #define ASM_OUTPUT_FUNCTION_PREFIX(FILE, FNNAME)                        \
  83   do {  ASM_OUTPUT_ALIGN (FILE, 2);                                     \
  84         fprintf ((FILE), "\t.long\t.ep.");                              \
  85         assemble_name (FILE, FNNAME);                                   \
  86         fprintf (FILE, "-");                                            \
  87         assemble_name (FILE, FNNAME);                                   \
  88         fprintf (FILE, "+0xc8000000\n");                                \
  89         current_function_original_name = (FNNAME);                      \
  90   } while (0)
  91
  92 /* Output the special label that must go just after each function's
  93    prologue code to support svr4 SDB.  */
  94
  95 #define ASM_OUTPUT_PROLOGUE_SUFFIX(FILE)                                \
  96   do {  fprintf (FILE, ".ep.");                                         \
  97         assemble_name (FILE, current_function_original_name);           \
  98         fprintf (FILE, ":\n");                                          \
  99   } while (0)
 100
 101 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
 102
 103    Note that we want to give these sections the SHF_WRITE attribute
 104    because these sections will actually contain data (i.e. tables of
 105    addresses of functions in the current root executable or shared library
 106    file) and, in the case of a shared library, the relocatable addresses
 107    will have to be properly resolved/relocated (and then written into) by
 108    the dynamic linker when it actually attaches the given shared library
 109    to the executing process.  (Note that on SVR4, you may wish to use the
 110    `-z text' option to the ELF linker, when building a shared library, as
 111    an additional check that you are doing everything right.  But if you do
 112    use the `-z text' option when building a shared library, you will get
 113    errors unless the .ctors and .dtors sections are marked as writable
 114    via the SHF_WRITE attribute.)  */
 115
 116 #undef CTORS_SECTION_ASM_OP
 117 #define CTORS_SECTION_ASM_OP    "\t.section\t.ctors,\"aw\""
 118 #undef DTORS_SECTION_ASM_OP
 119 #define DTORS_SECTION_ASM_OP    "\t.section\t.dtors,\"aw\""
 120
 121 /* Add definitions to support the .tdesc section as specified in the svr4
 122    ABI for the i860.  */
 123
 124 #define TDESC_SECTION_ASM_OP    "\t.section\t.tdesc"
 125
 126 #undef EXTRA_SECTIONS
 127 #define EXTRA_SECTIONS in_tdesc
 128
 129 #undef EXTRA_SECTION_FUNCTIONS
 130 #define EXTRA_SECTION_FUNCTIONS                                         \
 131   TDESC_SECTION_FUNCTION
 132
 133 #define TDESC_SECTION_FUNCTION                                          \
 134 void                                                                    \
 135 tdesc_section ()                                                        \
 136 {                                                                       \
 137   if (in_section != in_tdesc)                                           \
 138     {                                                                   \
 139       fprintf (asm_out_file, "%s\n", TDESC_SECTION_ASM_OP);             \
 140       in_section = in_tdesc;                                            \
 141     }                                                                   \
 142 }
 143