gcc/config/i386/sco.h

   1 /* Definitions for Intel 386 running SCO Unix System V.
   2    Copyright (C) 1988, 1992, 1994, 1995 Free, 1996 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 /* Mostly it's like AT&T Unix System V. */
  22
  23 #include "i386/sysv3.h"
  24
  25 /* By default, target has a 80387, uses IEEE compatible arithmetic,
  26    and returns float values in the 387, ie,
  27    (TARGET_80387 | TARGET_FLOAT_RETURNS_IN_80387)
  28
  29    SCO's software emulation of a 387 fails to handle the `fucomp'
  30    opcode.  fucomp is only used when generating IEEE compliant code.
  31    So don't make TARGET_IEEE_FP default for SCO. */
  32
  33 #undef TARGET_DEFAULT
  34 #define TARGET_DEFAULT 0201
  35
  36 /* Let's guess that the SCO software FPU emulator can't handle
  37    80-bit XFmode insns, so don't generate them.  */
  38 #undef LONG_DOUBLE_TYPE_SIZE
  39 #define LONG_DOUBLE_TYPE_SIZE 64
  40
  41 /* Use crt1.o as a startup file and crtn.o as a closing file.  */
  42
  43 #undef STARTFILE_SPEC
  44 #define STARTFILE_SPEC \
  45  "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} crtbegin.o%s"
  46
  47 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
  48
  49 /* Library spec, including SCO international language support. */
  50
  51 #undef LIB_SPEC
  52 #define LIB_SPEC \
  53  "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} %{scointl:libintl.a%s} -lc"
  54
  55 /* Specify predefined symbols in preprocessor.  */
  56
  57 #undef CPP_PREDEFINES
  58 #define CPP_PREDEFINES "-Dunix -DM_UNIX -DM_I386 -DM_COFF -DM_WORDSWAP -Asystem(svr3)"
  59
  60 #undef CPP_SPEC
  61 #define CPP_SPEC "%(cpp_cpu) %{scointl:-DM_INTERNAT}"
  62
  63 /* This spec is used for telling cpp whether char is signed or not.  */
  64
  65 #undef SIGNED_CHAR_SPEC
  66 #if DEFAULT_SIGNED_CHAR
  67 #define SIGNED_CHAR_SPEC \
  68  "%{funsigned-char:-D__CHAR_UNSIGNED__ -D_CHAR_UNSIGNED}"
  69 #else
  70 #define SIGNED_CHAR_SPEC \
  71  "%{!fsigned-char:-D__CHAR_UNSIGNED__ -D_CHAR_UNSIGNED}"
  72 #endif
  73
  74 /* Use atexit for static destructors, instead of defining
  75    our own exit function.  */
  76 #define HAVE_ATEXIT
  77
  78 /* Specify the size_t type.  */
  79 #define SIZE_TYPE "unsigned int"
  80
  81 #if 0 /* Not yet certain whether this is needed.  */
  82 /* If no 387, use the general regs to return floating values,
  83    since this system does not emulate the 80387.  */
  84
  85 #undef VALUE_REGNO
  86 #define VALUE_REGNO(MODE) \
  87   ((TARGET_80387
  88      && ((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode)
  89    ? FIRST_FLOAT_REG : 0)
  90
  91 #undef HARD_REGNO_MODE_OK
  92 #define HARD_REGNO_MODE_OK(REGNO, MODE)                                   \
  93   ((REGNO) < 2 ? 1                                                        \
  94    : (REGNO) < 4 ? 1                                                      \
  95    : FP_REGNO_P (REGNO) ? ((GET_MODE_CLASS (MODE) == MODE_FLOAT           \
  96                           || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT) \
  97                          && TARGET_80387                                  \
  98                          && GET_MODE_UNIT_SIZE (MODE) <= 8)               \
  99    : (MODE) != QImode)
 100 #endif
 101
 102 /* caller has to pop the extra argument passed to functions that return
 103    structures. */
 104
 105 #undef RETURN_POPS_ARGS
 106 #define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE)   \
 107   ((FUNDECL) && TREE_CODE (FUNDECL) == IDENTIFIER_NODE ? 0      \
 108    : (TARGET_RTD                                                \
 109       && (TYPE_ARG_TYPES (FUNTYPE) == 0                         \
 110           || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
 111               == void_type_node))) ? (SIZE)                     \
 112    : 0)
 113 /* On other 386 systems, the last line looks like this:
 114    : (aggregate_value_p (TREE_TYPE (FUNTYPE))) ? GET_MODE_SIZE (Pmode) : 0)  */
 115
 116 /* Handle #pragma pack. */
 117 #define HANDLE_SYSV_PRAGMA