gcc/config/i386/sco.h

   1 /* Definitions for Intel 386 running SCO Unix System V.
   2    Copyright (C) 1988, 1992, 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* Mostly it's like AT&T Unix System V. */
  21
  22 #include "i386/sysv3.h"
  23
  24 /* By default, target has a 80387, uses IEEE compatible arithmetic,
  25    and returns float values in the 387, ie,
  26    (TARGET_80387 | TARGET_FLOAT_RETURNS_IN_80387)
  27
  28    SCO's software emulation of a 387 fails to handle the `fucomp'
  29    opcode.  fucomp is only used when generating IEEE compliant code.
  30    So don't make TARGET_IEEE_FP default for SCO. */
  31
  32 #undef TARGET_DEFAULT
  33 #define TARGET_DEFAULT 0201
  34
  35 /* Let's guess that the SCO software FPU emulator can't handle
  36    80-bit XFmode insns, so don't generate them.  */
  37 #undef LONG_DOUBLE_TYPE_SIZE
  38 #define LONG_DOUBLE_TYPE_SIZE 64
  39
  40 /* Use crt1.o as a startup file and crtn.o as a closing file.  */
  41
  42 #undef STARTFILE_SPEC
  43 #define STARTFILE_SPEC \
  44  "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} crtbegin.o%s"
  45
  46 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
  47
  48 /* Library spec, including SCO international language support. */
  49
  50 #undef LIB_SPEC
  51 #define LIB_SPEC \
  52  "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} %{scointl:libintl.a%s} -lc"
  53
  54 /* Specify predefined symbols in preprocessor.  */
  55
  56 #undef CPP_PREDEFINES
  57 #define CPP_PREDEFINES "-Dunix -Di386 -DM_UNIX -DM_I386 -DM_COFF -DM_WORDSWAP -Asystem(unix) -Asystem(svr3) -Acpu(i386) -Amachine(i386)"
  58
  59 #undef CPP_SPEC
  60 #define CPP_SPEC "%{scointl:-DM_INTERNAT}"
  61
  62 /* This spec is used for telling cpp whether char is signed or not.  */
  63
  64 #undef SIGNED_CHAR_SPEC
  65 #if DEFAULT_SIGNED_CHAR
  66 #define SIGNED_CHAR_SPEC \
  67  "%{funsigned-char:-D__CHAR_UNSIGNED__ -D_CHAR_UNSIGNED}"
  68 #else
  69 #define SIGNED_CHAR_SPEC \
  70  "%{!fsigned-char:-D__CHAR_UNSIGNED__ -D_CHAR_UNSIGNED}"
  71 #endif
  72
  73 /* Use atexit for static destructors, instead of defining
  74    our own exit function.  */
  75 #define HAVE_ATEXIT
  76
  77 /* Specify the size_t type.  */
  78 #define SIZE_TYPE "unsigned int"
  79
  80 #if 0 /* Not yet certain whether this is needed.  */
  81 /* If no 387, use the general regs to return floating values,
  82    since this system does not emulate the 80387.  */
  83
  84 #undef VALUE_REGNO
  85 #define VALUE_REGNO(MODE) \
  86   ((TARGET_80387
  87      && ((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode)
  88    ? FIRST_FLOAT_REG : 0)
  89
  90 #undef HARD_REGNO_MODE_OK
  91 #define HARD_REGNO_MODE_OK(REGNO, MODE)                                   \
  92   ((REGNO) < 2 ? 1                                                        \
  93    : (REGNO) < 4 ? 1                                                      \
  94    : FP_REGNO_P (REGNO) ? ((GET_MODE_CLASS (MODE) == MODE_FLOAT           \
  95                           || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT) \
  96                          && TARGET_80387                                  \
  97                          && GET_MODE_UNIT_SIZE (MODE) <= 8)               \
  98    : (MODE) != QImode)
  99 #endif
 100
 101 /* caller has to pop the extra argument passed to functions that return
 102    structures. */
 103
 104 #undef RETURN_POPS_ARGS
 105 #define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE)   \
 106   (TREE_CODE (FUNTYPE) == IDENTIFIER_NODE ? 0                   \
 107    : (TARGET_RTD                                                \
 108       && (TYPE_ARG_TYPES (FUNTYPE) == 0                         \
 109           || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
 110               == void_type_node))) ? (SIZE)                     \
 111    : 0)
 112 /* On other 386 systems, the last line looks like this:
 113    : (aggregate_value_p (TREE_TYPE (FUNTYPE))) ? GET_MODE_SIZE (Pmode) : 0)  */
 114
 115 /* Handle #pragma pack. */
 116 #define HANDLE_SYSV_PRAGMA