gcc/config/i386/openbsdelf.h

   1 /* Configuration for an OpenBSD i386 target.
   2
   3    Copyright (C) 2005, 2007 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC 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 3, or (at your option)
  10 any later version.
  11
  12 GCC 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 GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* This gets defined in tm.h->linux.h->svr4.h, and keeps us from using
  22    libraries compiled with the native cc, so undef it. */
  23 #undef NO_DOLLAR_IN_LABEL
  24
  25 /* Override the default comment-starter of "/".  */
  26 #undef ASM_COMMENT_START
  27 #define ASM_COMMENT_START "#"
  28
  29 #undef DBX_REGISTER_NUMBER
  30 #define DBX_REGISTER_NUMBER(n)  svr4_dbx_register_map[n]
  31
  32 /* This goes away when the math-emulator is fixed */
  33 #undef TARGET_DEFAULT
  34 #define TARGET_DEFAULT \
  35   (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387)
  36
  37 /* Run-time target specifications */
  38
  39 #define TARGET_OS_CPP_BUILTINS()                \
  40   do                                            \
  41     {                                           \
  42         OPENBSD_OS_CPP_BUILTINS();              \
  43     }                                           \
  44   while (0)
  45
  46 /* As an elf system, we need crtbegin/crtend stuff.  */
  47 #undef STARTFILE_SPEC
  48 #define STARTFILE_SPEC "\
  49         %{!shared: %{pg:gcrt0%O%s} %{!pg:%{p:gcrt0%O%s} %{!p:crt0%O%s}} \
  50         crtbegin%O%s} %{shared:crtbeginS%O%s}"
  51 #undef ENDFILE_SPEC
  52 #define ENDFILE_SPEC "%{!shared:crtend%O%s} %{shared:crtendS%O%s}"
  53
  54 /* Layout of source language data types.  */
  55
  56 /* This must agree with <machine/ansi.h> */
  57 #undef SIZE_TYPE
  58 #define SIZE_TYPE "unsigned int"
  59
  60 #undef PTRDIFF_TYPE
  61 #define PTRDIFF_TYPE "int"
  62
  63 #undef WCHAR_TYPE
  64 #define WCHAR_TYPE "int"
  65
  66 #undef WCHAR_TYPE_SIZE
  67 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  68
  69 /* Assembler format: overall framework.  */
  70
  71 #undef ASM_APP_ON
  72 #define ASM_APP_ON "#APP\n"
  73
  74 #undef ASM_APP_OFF
  75 #define ASM_APP_OFF "#NO_APP\n"
  76
  77 #undef SET_ASM_OP
  78 #define SET_ASM_OP      "\t.set\t"
  79
  80 /* The following macros were originally stolen from i386v4.h.
  81    These have to be defined to get PIC code correct.  */
  82
  83 /* Assembler format: dispatch tables.  */
  84
  85 /* Assembler format: sections.  */
  86
  87 /* Stack & calling: aggregate returns.  */
  88
  89 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
  90    we want to retain compatibility with older gcc versions.  */
  91 #define DEFAULT_PCC_STRUCT_RETURN 0
  92
  93 /* Assembler format: alignment output.  */
  94
  95 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
  96 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
  97   if ((LOG) != 0) {\
  98     if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
  99     else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
 100   }
 101 #endif
 102
 103 /* Stack & calling: profiling.  */
 104
 105 /* OpenBSD's profiler recovers all information from the stack pointer.
 106    The icky part is not here, but in machine/profile.h.  */
 107 #undef FUNCTION_PROFILER
 108 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 109   fputs (flag_pic ? "\tcall __mcount@PLT\n": "\tcall __mcount\n", FILE);
 110
 111 /* Assembler format: exception region output.  */
 112
 113 /* our configuration still doesn't handle dwarf2 correctly */
 114 #define DWARF2_UNWIND_INFO 0
 115
 116 /* Assembler format: alignment output.  */
 117
 118 /* Note that we pick up ASM_OUTPUT_MAX_SKIP_ALIGN from i386/gas.h */
 119
 120 /* Note that we pick up ASM_OUTPUT_MI_THUNK from unix.h.  */
 121
 122 #undef LINK_SPEC
 123 #define LINK_SPEC \
 124   "%{!shared:%{!nostdlib:%{!r*:%{!e*:-e __start}}}} \
 125    %{shared:-shared} %{R*} \
 126    %{static:-Bstatic} \
 127    %{!static:-Bdynamic} \
 128    %{assert*} \
 129    %{!dynamic-linker:-dynamic-linker /usr/libexec/ld.so}"
 130
 131 #define OBSD_HAS_CORRECT_SPECS