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1 /* Definitions for Rs6000 running LynxOS.
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2 Copyright (C) 1995-2018 Free Software Foundation, Inc.
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3 Contributed by David Henkel-Wallace, Cygnus Support (gumby@cygnus.com)
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4 Rewritten by Adam Nemet, LynuxWorks Inc.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published
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10 by the Free Software Foundation; either version 3, or (at your
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11 option) any later version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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16 License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 /* Undefine the definition to enable the LynxOS default from the
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23 top-level lynx.h. */
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24
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25 #undef SUBTARGET_EXTRA_SPECS
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26
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27 /* Get rid off the spec definitions from rs6000/sysv4.h. */
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28
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29 #undef CPP_SPEC
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30 #define CPP_SPEC \
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31 "%{msoft-float: -D_SOFT_FLOAT} \
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32 %(cpp_cpu) \
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33 %(cpp_os_lynx)"
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34
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35 /* LynxOS only supports big-endian on PPC so we override the
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36 definition from sysv4.h. Since the LynxOS 4.0 compiler was set to
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37 return every structure in memory regardless of their size we have
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38 to emulate the same behavior here with disabling the SVR4 structure
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39 returning. */
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40
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41 #undef CC1_SPEC
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42 #define CC1_SPEC \
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43 "%{G*} %{mno-sdata:-msdata=none} \
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44 %{maltivec:-mabi=altivec} \
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45 -maix-struct-return"
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46
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47 #undef ASM_SPEC
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48 #define ASM_SPEC \
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49 "%(asm_cpu) \
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50 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}"
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51
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52 #undef STARTFILE_SPEC
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53 #undef ENDFILE_SPEC
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54 #undef LIB_SPEC
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55 #undef LINK_SPEC
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56 #define LINK_SPEC \
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57 "%{!msdata=none:%{G*}} %{msdata=none:-G0} \
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58 %(link_os_lynx)"
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59
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60 /* Override the definition from sysv4.h. */
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61
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62 #undef TARGET_OS_CPP_BUILTINS
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63 #define TARGET_OS_CPP_BUILTINS() \
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64 do \
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65 { \
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66 builtin_define ("__BIG_ENDIAN__"); \
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67 builtin_define ("__powerpc__"); \
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68 builtin_assert ("cpu=powerpc"); \
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69 builtin_assert ("machine=powerpc"); \
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70 builtin_define ("__PPC__"); \
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71 } \
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72 while (0)
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73
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74 /* Override the rs6000.h definition. */
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75
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76 #undef ASM_APP_ON
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77 #define ASM_APP_ON "#APP\n"
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78
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79 /* Override the rs6000.h definition. */
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80
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81 #undef ASM_APP_OFF
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82 #define ASM_APP_OFF "#NO_APP\n"
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83
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84 /* LynxOS does not do anything with .fixup plus let's not create
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85 writable section for linkonce.r and linkonce.t. */
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86
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87 #undef RELOCATABLE_NEEDS_FIXUP
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88
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89 /* Override these from rs6000.h with the generic definition. */
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90
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91 #undef SIZE_TYPE
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92 #undef ASM_OUTPUT_ALIGN
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93 #undef PREFERRED_DEBUGGING_TYPE
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94
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95 /* The file rs6000.c defines TARGET_HAVE_TLS unconditionally to the
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96 value of HAVE_AS_TLS. HAVE_AS_TLS is true as gas support for TLS
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97 is detected by configure. Override the definition to false. */
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98
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99 #undef HAVE_AS_TLS
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100 #define HAVE_AS_TLS 0
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101
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102 /* Use standard DWARF numbering for DWARF debugging information. */
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103 #define RS6000_USE_DWARF_NUMBERING
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104
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105 #ifdef CRT_BEGIN
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106 /* This function is part of crtbegin*.o which is at the beginning of
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107 the link and is called from .fini which is usually toward the end
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108 of the executable. Make it longcall so that we don't limit the
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109 text size of the executables to 32M. */
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110
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111 static void __do_global_dtors_aux (void) __attribute__ ((longcall));
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112 #endif /* CRT_BEGIN */
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113
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114 #ifdef CRT_END
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115 /* Similarly here. This function resides in crtend*.o which is toward
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116 to end of the link and is called from .init which is at the
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117 beginning. */
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118
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119 static void __do_global_ctors_aux (void) __attribute__ ((longcall));
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120 #endif /* CRT_END */
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