gcc/config/i386/openbsdelf.h

   1 /* Configuration for an OpenBSD i386 target.
   2
   3    Copyright (C) 2005 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 2, 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 COPYING.  If not, write to
  19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* This gets defined in tm.h->linux.h->svr4.h, and keeps us from using
  23    libraries compiled with the native cc, so undef it. */
  24 #undef NO_DOLLAR_IN_LABEL
  25
  26 /* Override the default comment-starter of "/".  */
  27 #undef ASM_COMMENT_START
  28 #define ASM_COMMENT_START "#"
  29
  30 #undef DBX_REGISTER_NUMBER
  31 #define DBX_REGISTER_NUMBER(n)  svr4_dbx_register_map[n]
  32
  33 /* This goes away when the math-emulator is fixed */
  34 #undef TARGET_DEFAULT
  35 #define TARGET_DEFAULT \
  36   (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387)
  37
  38 /* Run-time target specifications */
  39
  40 #define TARGET_OS_CPP_BUILTINS()                \
  41   do                                            \
  42     {                                           \
  43         OPENBSD_OS_CPP_BUILTINS();              \
  44     }                                           \
  45   while (0)
  46
  47 /* As an elf system, we need crtbegin/crtend stuff.  */
  48 #undef STARTFILE_SPEC
  49 #define STARTFILE_SPEC "\
  50         %{!shared: %{pg:gcrt0%O%s} %{!pg:%{p:gcrt0%O%s} %{!p:crt0%O%s}} \
  51         crtbegin%O%s} %{shared:crtbeginS%O%s}"
  52 #undef ENDFILE_SPEC
  53 #define ENDFILE_SPEC "%{!shared:crtend%O%s} %{shared:crtendS%O%s}"
  54
  55 /* Layout of source language data types.  */
  56
  57 /* This must agree with <machine/ansi.h> */
  58 #undef SIZE_TYPE
  59 #define SIZE_TYPE "unsigned int"
  60
  61 #undef PTRDIFF_TYPE
  62 #define PTRDIFF_TYPE "int"
  63
  64 #undef WCHAR_TYPE
  65 #define WCHAR_TYPE "int"
  66
  67 #undef WCHAR_TYPE_SIZE
  68 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  69
  70 /* Assembler format: overall framework.  */
  71
  72 #undef ASM_APP_ON
  73 #define ASM_APP_ON "#APP\n"
  74
  75 #undef ASM_APP_OFF
  76 #define ASM_APP_OFF "#NO_APP\n"
  77
  78 #undef SET_ASM_OP
  79 #define SET_ASM_OP      "\t.set\t"
  80
  81 /* The following macros were originally stolen from i386v4.h.
  82    These have to be defined to get PIC code correct.  */
  83
  84 /* Assembler format: dispatch tables.  */
  85
  86 /* Assembler format: sections.  */
  87
  88 /* Stack & calling: aggregate returns.  */
  89
  90 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
  91    we want to retain compatibility with older gcc versions.  */
  92 #define DEFAULT_PCC_STRUCT_RETURN 0
  93
  94 /* Assembler format: alignment output.  */
  95
  96 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
  97 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
  98   if ((LOG) != 0) {\
  99     if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
 100     else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
 101   }
 102 #endif
 103
 104 /* Stack & calling: profiling.  */
 105
 106 /* OpenBSD's profiler recovers all information from the stack pointer.
 107    The icky part is not here, but in machine/profile.h.  */
 108 #undef FUNCTION_PROFILER
 109 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 110   fputs (flag_pic ? "\tcall __mcount@PLT\n": "\tcall __mcount\n", FILE);
 111
 112 /* Assembler format: exception region output.  */
 113
 114 /* our configuration still doesn't handle dwarf2 correctly */
 115 #define DWARF2_UNWIND_INFO 0
 116
 117 /* Assembler format: alignment output.  */
 118
 119 /* Note that we pick up ASM_OUTPUT_MAX_SKIP_ALIGN from i386/gas.h */
 120
 121 /* Note that we pick up ASM_OUTPUT_MI_THUNK from unix.h.  */
 122
 123 #undef LINK_SPEC
 124 #define LINK_SPEC \
 125   "%{!shared:%{!nostdlib:%{!r*:%{!e*:-e __start}}}} \
 126    %{shared:-shared} %{R*} \
 127    %{static:-Bstatic} \
 128    %{!static:-Bdynamic} \
 129    %{assert*} \
 130    %{!dynamic-linker:-dynamic-linker /usr/libexec/ld.so}"
 131
 132 #define OBSD_HAS_CORRECT_SPECS