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1 /* Definitions for Rs6000 running LynxOS.
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2 Copyright (C) 1995, 1996, 2000, 2002, 2003, 2004, 2005, 2007
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3 Free Software Foundation, Inc.
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4 Contributed by David Henkel-Wallace, Cygnus Support (gumby@cygnus.com)
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5 Rewritten by Adam Nemet, LynuxWorks Inc.
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published
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11 by the Free Software Foundation; either version 3, or (at your
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12 option) any later version.
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13
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14 GCC is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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17 License for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with GCC; see the file COPYING3. If not see
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21 <http://www.gnu.org/licenses/>. */
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22
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23 /* Override the definition in sysv4.h. */
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24
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25 #undef TARGET_VERSION
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26 #define TARGET_VERSION fputs (" (PowerPC/LynxOS)", stderr);
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27
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28 /* Undefine the definition to enable the LynxOS default from the
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29 top-level lynx.h. */
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30
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31 #undef SUBTARGET_EXTRA_SPECS
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32
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33 /* Get rid off the spec definitions from rs6000/sysv4.h. */
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34
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35 #undef CPP_SPEC
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36 #define CPP_SPEC \
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37 "%{msoft-float: -D_SOFT_FLOAT} \
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38 %(cpp_cpu) \
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39 %(cpp_os_lynx)"
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40
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41 /* LynxOS only supports big-endian on PPC so we override the
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42 definition from sysv4.h. Since the LynxOS 4.0 compiler was set to
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43 return every structure in memory regardless of their size we have
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44 to emulate the same behavior here with disabling the SVR4 structure
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45 returning. */
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46
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47 #undef CC1_SPEC
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48 #define CC1_SPEC \
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49 "%{G*} %{mno-sdata:-msdata=none} \
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50 %{maltivec:-mabi=altivec} \
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51 -maix-struct-return"
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52
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53 #undef ASM_SPEC
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54 #define ASM_SPEC \
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55 "%(asm_cpu) \
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56 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}"
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57
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58 #undef STARTFILE_SPEC
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59 #undef ENDFILE_SPEC
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60 #undef LIB_SPEC
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61 #undef LINK_SPEC
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62 #define LINK_SPEC \
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63 "%{!msdata=none:%{G*}} %{msdata=none:-G0} \
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64 %(link_os_lynx)"
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65
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66 /* Override the definition from sysv4.h. */
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67
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68 #undef TARGET_OS_CPP_BUILTINS
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69 #define TARGET_OS_CPP_BUILTINS() \
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70 do \
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71 { \
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72 builtin_define ("__BIG_ENDIAN__"); \
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73 builtin_define ("__powerpc__"); \
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74 builtin_assert ("cpu=powerpc"); \
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75 builtin_assert ("machine=powerpc"); \
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76 builtin_define ("__PPC__"); \
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77 } \
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78 while (0)
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79
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80 /* Override the rs6000.h definition. */
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81
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82 #undef ASM_APP_ON
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83 #define ASM_APP_ON "#APP\n"
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84
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85 /* Override the rs6000.h definition. */
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86
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87 #undef ASM_APP_OFF
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88 #define ASM_APP_OFF "#NO_APP\n"
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89
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90 /* LynxOS does not do anything with .fixup plus let's not create
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91 writable section for linkonce.r and linkonce.t. */
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92
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93 #undef RELOCATABLE_NEEDS_FIXUP
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94
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95 /* Override these from rs6000.h with the generic definition. */
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96
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97 #undef SIZE_TYPE
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98 #undef ASM_OUTPUT_ALIGN
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99 #undef PREFERRED_DEBUGGING_TYPE
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100
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101 /* The file rs6000.c defines TARGET_HAVE_TLS unconditionally to the
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102 value of HAVE_AS_TLS. HAVE_AS_TLS is true as gas support for TLS
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103 is detected by configure. Override the definition to false. */
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104
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105 #undef HAVE_AS_TLS
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106 #define HAVE_AS_TLS 0
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107
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108 #ifdef CRT_BEGIN
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109 /* This function is part of crtbegin*.o which is at the beginning of
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110 the link and is called from .fini which is usually toward the end
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111 of the executable. Make it longcall so that we don't limit the
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112 text size of the executables to 32M. */
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113
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114 static void __do_global_dtors_aux (void) __attribute__ ((longcall));
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115 #endif /* CRT_BEGIN */
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116
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117 #ifdef CRT_END
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118 /* Similarly here. This function resides in crtend*.o which is toward
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119 to end of the link and is called from .init which is at the
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120 beginning. */
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121
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122 static void __do_global_ctors_aux (void) __attribute__ ((longcall));
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123 #endif /* CRT_END */
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