gcc/config/i386/openbsd.h

   1 /* Configuration for an OpenBSD i386 target.
   2    Copyright (C) 1999, 2000 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 /* This is tested by i386gas.h.  */
  22 #define YES_UNDERSCORES
  23
  24 #include <i386/gstabs.h>
  25
  26 /* Get generic OpenBSD definitions.  */
  27 #define OBSD_OLD_GAS
  28 #include <openbsd.h>
  29
  30 /* This goes away when the math-emulator is fixed */
  31 #undef TARGET_SUBTARGET_DEFAULT
  32 #define TARGET_SUBTARGET_DEFAULT \
  33   (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387)
  34
  35 /* Run-time target specifications */
  36 #define CPP_PREDEFINES "-D__unix__ -D__OpenBSD__ \
  37  -Asystem=unix -Asystem=bsd -Asystem=OpenBSD"
  38
  39 /* Layout of source language data types.  */
  40
  41 /* This must agree with <machine/ansi.h> */
  42 #undef SIZE_TYPE
  43 #define SIZE_TYPE "unsigned int"
  44
  45 #undef PTRDIFF_TYPE
  46 #define PTRDIFF_TYPE "int"
  47
  48 #undef WCHAR_TYPE
  49 #define WCHAR_TYPE "int"
  50
  51 #undef WCHAR_TYPE_SIZE
  52 #define WCHAR_TYPE_SIZE 32
  53
  54 /* Assembler format: overall framework.  */
  55
  56 #undef ASM_APP_ON
  57 #define ASM_APP_ON "#APP\n"
  58
  59 #undef ASM_APP_OFF
  60 #define ASM_APP_OFF "#NO_APP\n"
  61
  62 /* The following macros were originally stolen from i386v4.h.
  63    These have to be defined to get PIC code correct.  */
  64
  65 /* Assembler format: dispatch tables.  */
  66
  67 /* How to output an element of a case-vector that is relative.
  68    This is only used for PIC code.  See comments by the `casesi' insn in
  69    i386.md for an explanation of the expression this outputs.  */
  70 #undef ASM_OUTPUT_ADDR_DIFF_ELT
  71 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
  72   fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
  73
  74 /* Assembler format: sections.  */
  75
  76 /* Indicate when jump tables go in the text section.  This is
  77    necessary when compiling PIC code.  */
  78 #define JUMP_TABLES_IN_TEXT_SECTION  (flag_pic)
  79
  80 /* Stack & calling: aggregate returns.  */
  81
  82 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
  83    we want to retain compatibility with older gcc versions.  */
  84 #define DEFAULT_PCC_STRUCT_RETURN 0
  85
  86 /* Assembler format: alignment output.  */
  87
  88 /* Kludgy test: when gas is upgraded, it will have p2align, and no problems
  89    with nops.  */
  90 #ifndef HAVE_GAS_MAX_SKIP_P2ALIGN
  91 /* i386 OpenBSD still uses an older gas that doesn't insert nops by default
  92    when the .align directive demands to insert extra space in the text
  93    segment.  */
  94 #undef ASM_OUTPUT_ALIGN
  95 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
  96   if ((LOG)!=0) fprintf ((FILE), "\t.align %d,0x90\n", (LOG))
  97 #endif
  98
  99 /* Stack & calling: profiling.  */
 100
 101 /* OpenBSD's profiler recovers all information from the stack pointer.
 102    The icky part is not here, but in machine/profile.h.  */
 103 #undef FUNCTION_PROFILER
 104 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 105   fputs (flag_pic ? "\tcall mcount@PLT\n": "\tcall mcount\n", FILE);
 106
 107 /* Assembler format: exception region output.  */
 108
 109 /* All configurations that don't use elf must be explicit about not using
 110    dwarf unwind information. egcs doesn't try too hard to check internal
 111    configuration files...  */
 112 #define DWARF2_UNWIND_INFO 0
 113
 114 #undef ASM_PREFERRED_EH_DATA_FORMAT
 115
 116 /* Assembler format: alignment output.  */
 117
 118 /* A C statement to output to the stdio stream FILE an assembler
 119    command to advance the location counter to a multiple of 1<<LOG
 120    bytes if it is within MAX_SKIP bytes.
 121
 122    This will be used to align code labels according to Intel
 123    recommendations, in prevision of binutils upgrade.  */
 124 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 125 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)                    \
 126   do {                                                                  \
 127     if ((LOG) != 0) {                                                   \
 128       if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG));  \
 129       else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));  \
 130     }                                                                   \
 131   } while (0)
 132 #endif
 133
 134 /* Note that we pick up ASM_OUTPUT_MI_THUNK from unix.h.  */
 135
 136 #undef ASM_COMMENT_START
 137 #define ASM_COMMENT_START ";#"
 138