gcc/config/i386/openbsd.h

   1 /* Configuration for an OpenBSD i386 target.
   2
   3    Copyright (C) 1999 Free Software Foundation, Inc.
   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 /* This is tested by i386gas.h.  */
  23 #define YES_UNDERSCORES
  24
  25 #include <i386/gstabs.h>
  26
  27 /* Get perform_* macros to build libgcc.a.  */
  28 #include <i386/perform.h>
  29
  30 /* Get generic OpenBSD definitions.  */
  31 #define OBSD_OLD_GAS
  32 #include <openbsd.h>
  33
  34 /* This goes away when the math-emulator is fixed */
  35 #undef TARGET_DEFAULT
  36 #define TARGET_DEFAULT \
  37   (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387)
  38
  39 /* Run-time target specifications */
  40 #define CPP_PREDEFINES "-D__unix__ -D__i386__ -D__OpenBSD__ -Asystem(unix) -Asystem(OpenBSD) -Acpu(i386) -Amachine(i386)"
  41
  42 /* Layout of source language data types.  */
  43
  44 /* This must agree with <machine/ansi.h> */
  45 #undef SIZE_TYPE
  46 #define SIZE_TYPE "unsigned int"
  47
  48 #undef PTRDIFF_TYPE
  49 #define PTRDIFF_TYPE "int"
  50
  51 #undef WCHAR_TYPE
  52 #define WCHAR_TYPE "int"
  53
  54 #undef WCHAR_TYPE_SIZE
  55 #define WCHAR_TYPE_SIZE 32
  56
  57 /* Assembler format: overall framework.  */
  58
  59 #undef ASM_APP_ON
  60 #define ASM_APP_ON "#APP\n"
  61
  62 #undef ASM_APP_OFF
  63 #define ASM_APP_OFF "#NO_APP\n"
  64
  65 /* The following macros were originally stolen from i386v4.h.
  66    These have to be defined to get PIC code correct.  */
  67
  68 /* Assembler format: dispatch tables.  */
  69
  70 /* How to output an element of a case-vector that is relative.
  71    This is only used for PIC code.  See comments by the `casesi' insn in
  72    i386.md for an explanation of the expression this outputs.  */
  73 #undef ASM_OUTPUT_ADDR_DIFF_ELT
  74 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
  75   fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
  76
  77 /* Assembler format: sections.  */
  78
  79 /* Indicate when jump tables go in the text section.  This is
  80    necessary when compiling PIC code.  */
  81 #define JUMP_TABLES_IN_TEXT_SECTION  (flag_pic)
  82
  83 /* Stack & calling: aggregate returns.  */
  84
  85 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
  86    we want to retain compatibility with older gcc versions.  */
  87 #define DEFAULT_PCC_STRUCT_RETURN 0
  88
  89 /* Assembler format: alignment output.  */
  90
  91 /* Kludgy test: when gas is upgraded, it will have p2align, and no problems
  92    with nops.  */
  93 #ifndef HAVE_GAS_MAX_SKIP_P2ALIGN
  94 /* i386 OpenBSD still uses an older gas that doesn't insert nops by default
  95    when the .align directive demands to insert extra space in the text
  96    segment.  */
  97 #undef ASM_OUTPUT_ALIGN
  98 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
  99   if ((LOG)!=0) fprintf ((FILE), "\t.align %d,0x90\n", (LOG))
 100 #endif
 101
 102 /* Stack & calling: profiling.  */
 103
 104 /* OpenBSD's profiler recovers all information from the stack pointer.
 105    The icky part is not here, but in machine/profile.h.  */
 106 #undef FUNCTION_PROFILER
 107 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 108   fputs (flag_pic ? "\tcall mcount@PLT\n": "\tcall mcount\n", FILE);
 109
 110 /* Assembler format: exception region output.  */
 111
 112 /* All configurations that don't use elf must be explicit about not using
 113    dwarf unwind information. egcs doesn't try too hard to check internal
 114    configuration files...  */
 115 #define DWARF2_UNWIND_INFO 0
 116
 117 /* Assembler format: alignment output.  */
 118
 119 /* A C statement to output to the stdio stream FILE an assembler
 120    command to advance the location counter to a multiple of 1<<LOG
 121    bytes if it is within MAX_SKIP bytes.
 122
 123    This will be used to align code labels according to Intel
 124    recommendations, in prevision of binutils upgrade.  */
 125 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 126 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)                    \
 127   do {                                                                  \
 128     if ((LOG) != 0) {                                                   \
 129       if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG));  \
 130       else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));  \
 131     }                                                                   \
 132   } while (0)
 133 #endif
 134
 135 /* Note that we pick up ASM_OUTPUT_MI_THUNK from unix.h.  */
 136