gcc/config/i386/svr3gas.h

   1 /* Definitions for Intel 386 running system V, using gas.
   2    Copyright (C) 1992, 1996, 2000, 2002 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #define TARGET_VERSION fprintf (stderr, " (80386, ATT syntax)");
  22
  23 /* Add stuff that normally comes from i386/sysv3.h */
  24
  25 /* longjmp may fail to restore the registers if called from the same
  26    function that called setjmp.  To compensate, the compiler avoids
  27    putting variables in registers in functions that use both setjmp
  28    and longjmp.  */
  29
  30 #define NON_SAVING_SETJMP \
  31   (current_function_calls_setjmp && current_function_calls_longjmp)
  32
  33 /* longjmp may fail to restore the stack pointer if the saved frame
  34    pointer is the same as the caller's frame pointer.  Requiring a frame
  35    pointer in any function that calls setjmp or longjmp avoids this
  36    problem, unless setjmp and longjmp are called from the same function.
  37    Since a frame pointer will be required in such a function, it is OK
  38    that the stack pointer is not restored.  */
  39
  40 #undef SUBTARGET_FRAME_POINTER_REQUIRED
  41 #define SUBTARGET_FRAME_POINTER_REQUIRED \
  42   (current_function_calls_setjmp || current_function_calls_longjmp)
  43
  44 /* Modify ASM_OUTPUT_LOCAL slightly to test -msvr3-shlib, adapted to gas  */
  45 #undef ASM_OUTPUT_LOCAL
  46 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
  47   do {                                                  \
  48     int align = exact_log2 (ROUNDED);                   \
  49     if (align > 2) align = 2;                           \
  50     if (TARGET_SVR3_SHLIB)                              \
  51       {                                                 \
  52         data_section ();                                \
  53         ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
  54         ASM_OUTPUT_LABEL ((FILE), (NAME));              \
  55         fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
  56       }                                                 \
  57     else                                                \
  58       {                                                 \
  59         fputs (".lcomm ", (FILE));                      \
  60         assemble_name ((FILE), (NAME));                 \
  61         fprintf ((FILE), ",%u\n", (ROUNDED));           \
  62       }                                                 \
  63   } while (0)
  64
  65 /* Add stuff that normally comes from i386/sysv3.h via svr3.h */
  66
  67 /* Define the actual types of some ANSI-mandated types.  These
  68    definitions should work for most SVR3 systems.  */
  69
  70 #undef SIZE_TYPE
  71 #define SIZE_TYPE "unsigned int"
  72
  73 #undef PTRDIFF_TYPE
  74 #define PTRDIFF_TYPE "int"
  75
  76 #undef WCHAR_TYPE
  77 #define WCHAR_TYPE "long int"
  78
  79 #undef WCHAR_TYPE_SIZE
  80 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  81 \f
  82 /* ??? This stuff is copied from config/svr3.h.  In the future,
  83    this file should be rewritten to include config/svr3.h
  84    and override what isn't right.  */
  85
  86 /* Support const sections and the ctors and dtors sections for g++.  */
  87
  88 #define USE_CONST_SECTION       0
  89
  90 #define INIT_SECTION_ASM_OP     "\t.section\t.init"
  91 #define FINI_SECTION_ASM_OP     "\t.section .fini,\"x\""
  92 #define CONST_SECTION_ASM_OP    "\t.section\t.rodata, \"x\""
  93 #define CTORS_SECTION_ASM_OP    INIT_SECTION_ASM_OP
  94 #define DTORS_SECTION_ASM_OP    FINI_SECTION_ASM_OP
  95
  96 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
  97    because they push on the stack.  */
  98 /* This is copied from i386/sysv3.h.  */
  99
 100 #define CTOR_LIST_BEGIN                         \
 101   asm (INIT_SECTION_ASM_OP);                    \
 102   asm ("pushl $0")
 103 #define CTOR_LIST_END CTOR_LIST_BEGIN
 104
 105 /* Constructor list on stack is in reverse order.  Go to the end of the
 106    list and go backwards to call constructors in the right order.  */
 107 #define DO_GLOBAL_CTORS_BODY                                    \
 108 do {                                                            \
 109   func_ptr *p, *beg = alloca (0);                               \
 110   for (p = beg; *p; p++)                                        \
 111     ;                                                           \
 112   while (p != beg)                                              \
 113     (*--p) ();                                                  \
 114 } while (0)
 115
 116 /* Add extra sections .rodata, .init and .fini.  */
 117
 118 #undef EXTRA_SECTIONS
 119 #define EXTRA_SECTIONS in_const, in_init, in_fini
 120
 121 #undef EXTRA_SECTION_FUNCTIONS
 122 #define EXTRA_SECTION_FUNCTIONS                                 \
 123   CONST_SECTION_FUNCTION                                        \
 124   INIT_SECTION_FUNCTION                                         \
 125   FINI_SECTION_FUNCTION
 126
 127 #define INIT_SECTION_FUNCTION                                   \
 128 void                                                            \
 129 init_section ()                                                 \
 130 {                                                               \
 131   if (in_section != in_init)                                    \
 132     {                                                           \
 133       fprintf (asm_out_file, "%s\n", INIT_SECTION_ASM_OP);      \
 134       in_section = in_init;                                     \
 135     }                                                           \
 136 }
 137
 138 #define FINI_SECTION_FUNCTION                                   \
 139 void                                                            \
 140 fini_section ()                                                 \
 141 {                                                               \
 142   if (in_section != in_fini)                                    \
 143     {                                                           \
 144       fprintf (asm_out_file, "%s\n", FINI_SECTION_ASM_OP);      \
 145       in_section = in_fini;                                     \
 146     }                                                           \
 147 }
 148
 149 #define READONLY_DATA_SECTION() const_section ()
 150
 151 #define CONST_SECTION_FUNCTION                                          \
 152 void                                                                    \
 153 const_section ()                                                        \
 154 {                                                                       \
 155   if (!USE_CONST_SECTION)                                               \
 156     text_section();                                                     \
 157   else if (in_section != in_const)                                      \
 158     {                                                                   \
 159       fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP);             \
 160       in_section = in_const;                                            \
 161     }                                                                   \
 162 }
 163
 164 #define TARGET_ASM_CONSTRUCTOR  ix86_svr3_asm_out_constructor
 165
 166 /* A C statement or statements to switch to the appropriate
 167    section for output of RTX in mode MODE.  RTX is some kind
 168    of constant in RTL.  The argument MODE is redundant except
 169    in the case of a `const_int' rtx.  Currently, these always
 170    go into the const section.  */
 171
 172 #define SELECT_RTX_SECTION(MODE,RTX,ALIGN) const_section()