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1 /* Definitions of target machine for GNU compiler,
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2 for IBM RS/6000 POWER running AIX.
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3 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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4 Free Software Foundation, 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 /* Yes! We are AIX! */
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23 #define DEFAULT_ABI ABI_AIX
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24 #undef TARGET_AIX
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25 #define TARGET_AIX 1
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26
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27 /* AIX always has a TOC. */
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28 #define TARGET_NO_TOC 0
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29 #define TARGET_TOC 1
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30 #define FIXED_R2 1
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31
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32 /* AIX allows r13 to be used in 32-bit mode. */
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33 #define FIXED_R13 0
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34
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35 /* 32-bit and 64-bit AIX stack boundary is 128. */
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36 #undef STACK_BOUNDARY
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37 #define STACK_BOUNDARY 128
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38
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39 #undef TARGET_IEEEQUAD
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40 #define TARGET_IEEEQUAD 0
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41
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42 /* The AIX linker will discard static constructors in object files before
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43 collect has a chance to see them, so scan the object files directly. */
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44 #define COLLECT_EXPORT_LIST
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45
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46 /* Handle #pragma weak and #pragma pack. */
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47 #define HANDLE_SYSV_PRAGMA 1
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48
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49 /* This is the only version of nm that collect2 can work with. */
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50 #define REAL_NM_FILE_NAME "/usr/ucb/nm"
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51
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52 #define USER_LABEL_PREFIX ""
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53
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54 /* Don't turn -B into -L if the argument specifies a relative file name. */
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55 #define RELATIVE_PREFIX_NOT_LINKDIR
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56
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57 /* Because of the above, we must have gcc search itself to find libgcc.a. */
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58 #define LINK_LIBGCC_SPECIAL_1
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59
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60 #define MFWRAP_SPEC " %{static: %{fmudflap|fmudflapth: \
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61 -brename:malloc,__wrap_malloc -brename:__real_malloc,malloc \
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62 -brename:free,__wrap_free -brename:__real_free,free \
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63 -brename:calloc,__wrap_calloc -brename:__real_calloc,calloc \
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64 -brename:realloc,__wrap_realloc -brename:__real_realloc,realloc \
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65 -brename:mmap,__wrap_mmap -brename:__real_mmap,mmap \
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66 -brename:munmap,__wrap_munmap -brename:__real_munmap,munmap \
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67 -brename:alloca,__wrap_alloca -brename:__real_alloca,alloca \
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68 } %{fmudflapth: \
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69 -brename:pthread_create,__wrap_pthread_create \
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70 -brename:__real_pthread_create,pthread_create \
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71 -brename:pthread_join,__wrap_pthread_join \
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72 -brename:__real_pthread_join,pthread_join \
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73 -brename:pthread_exit,__wrap_pthread_exit \
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74 -brename:__real_pthread_exit,pthread_exit \
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75 }} %{fmudflap|fmudflapth: \
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76 -brename:main,__wrap_main -brename:__real_main,main \
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77 }"
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78
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79 #define MFLIB_SPEC " %{fmudflap: -lmudflap \
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80 %{static:%(link_gcc_c_sequence) -lmudflap}} \
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81 %{fmudflapth: -lmudflapth -lpthread \
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82 %{static:%(link_gcc_c_sequence) -lmudflapth}} "
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83
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84 /* Names to predefine in the preprocessor for this target machine. */
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85 #define TARGET_OS_AIX_CPP_BUILTINS() \
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86 do \
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87 { \
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88 builtin_define ("_IBMR2"); \
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89 builtin_define ("_POWER"); \
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90 builtin_define ("_AIX"); \
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91 builtin_define ("_AIX32"); \
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92 builtin_define ("_AIX41"); \
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93 builtin_define ("_LONG_LONG"); \
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94 if (TARGET_LONG_DOUBLE_128) \
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95 builtin_define ("__LONGDOUBLE128"); \
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96 builtin_assert ("system=unix"); \
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97 builtin_assert ("system=aix"); \
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98 } \
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99 while (0)
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100
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101 /* Define appropriate architecture macros for preprocessor depending on
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102 target switches. */
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103
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104 #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\
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105 %{ansi: -D_ANSI_C_SOURCE}"
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106
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107 #define CC1_SPEC "%(cc1_cpu)"
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108
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109 #undef ASM_DEFAULT_SPEC
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110 #define ASM_DEFAULT_SPEC ""
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111
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112 /* Tell the assembler to assume that all undefined names are external.
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113
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114 Don't do this until the fixed IBM assembler is more generally available.
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115 When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL,
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116 ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no
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117 longer be needed. Also, the extern declaration of mcount in
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118 rs6000_xcoff_file_start will no longer be needed. */
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119
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120 /* #define ASM_SPEC "-u %(asm_cpu)" */
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121
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122 /* Default location of syscalls.exp under AIX */
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123 #ifndef CROSS_DIRECTORY_STRUCTURE
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124 #define LINK_SYSCALLS_SPEC "-bI:/lib/syscalls.exp"
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125 #else
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126 #define LINK_SYSCALLS_SPEC ""
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127 #endif
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128
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129 /* Default location of libg.exp under AIX */
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130 #ifndef CROSS_DIRECTORY_STRUCTURE
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131 #define LINK_LIBG_SPEC "-bexport:/usr/lib/libg.exp"
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132 #else
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133 #define LINK_LIBG_SPEC ""
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134 #endif
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135
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136 /* Define the options for the binder: Start text at 512, align all segments
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137 to 512 bytes, and warn if there is text relocation.
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138
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139 The -bhalt:4 option supposedly changes the level at which ld will abort,
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140 but it also suppresses warnings about multiply defined symbols and is
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141 used by the AIX cc command. So we use it here.
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142
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143 -bnodelcsect undoes a poor choice of default relating to multiply-defined
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144 csects. See AIX documentation for more information about this.
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145
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146 -bM:SRE tells the linker that the output file is Shared REusable. Note
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147 that to actually build a shared library you will also need to specify an
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148 export list with the -Wl,-bE option. */
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149
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150 #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\
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151 %{static:-bnso %(link_syscalls) } \
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152 %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}"
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153
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154 /* Profiled library versions are used by linking with special directories. */
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155 #define LIB_SPEC "%{pg:-L/lib/profiled -L/usr/lib/profiled}\
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156 %{p:-L/lib/profiled -L/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc"
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157
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158 /* Static linking with shared libstdc++ requires libsupc++ as well. */
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159 #define LIBSTDCXX_STATIC "-lstdc++ -lsupc++"
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160
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161 /* This now supports a natural alignment mode. */
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162 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */
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163 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
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164 ((TARGET_ALIGN_NATURAL == 0 \
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165 && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode) \
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166 ? MIN ((COMPUTED), 32) \
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167 : (COMPUTED))
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168
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169 /* AIX increases natural record alignment to doubleword if the first
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170 field is an FP double while the FP fields remain word aligned. */
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171 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
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172 ((TREE_CODE (STRUCT) == RECORD_TYPE \
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173 || TREE_CODE (STRUCT) == UNION_TYPE \
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174 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
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175 && TARGET_ALIGN_NATURAL == 0 \
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176 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
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177 : MAX ((COMPUTED), (SPECIFIED)))
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178
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179 /* The AIX ABI isn't explicit on whether aggregates smaller than a
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180 word/doubleword should be padded upward or downward. One could
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181 reasonably assume that they follow the normal rules for structure
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182 layout treating the parameter area as any other block of memory,
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183 then map the reg param area to registers, i.e., pad upward, which
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184 is the way IBM Compilers for AIX behave.
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185 Setting both of the following defines results in this behavior. */
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186 #define AGGREGATE_PADDING_FIXED 1
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187 #define AGGREGATES_PAD_UPWARD_ALWAYS 1
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188
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189 /* Specify padding for the last element of a block move between
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190 registers and memory. FIRST is nonzero if this is the only
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191 element. */
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192 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
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193 (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
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194
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195 /* Indicate that jump tables go in the text section. */
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196
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197 #define JUMP_TABLES_IN_TEXT_SECTION 1
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198
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199 /* Define any extra SPECS that the compiler needs to generate. */
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200 #undef SUBTARGET_EXTRA_SPECS
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201 #define SUBTARGET_EXTRA_SPECS \
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202 { "link_syscalls", LINK_SYSCALLS_SPEC }, \
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203 { "link_libg", LINK_LIBG_SPEC }
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204
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205 /* Define cutoff for using external functions to save floating point. */
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206 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63)
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207 /* And similarly for general purpose registers. */
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208 #define GP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 32)
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209
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210 /* __throw will restore its own return address to be the same as the
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211 return address of the function that the throw is being made to.
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212 This is unfortunate, because we want to check the original
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213 return address to see if we need to restore the TOC.
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214 So we have to squirrel it away with this. */
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215 #define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init ()
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216
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217 /* If the current unwind info (FS) does not contain explicit info
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218 saving R2, then we have to do a minor amount of code reading to
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219 figure out if it was saved. The big problem here is that the
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220 code that does the save/restore is generated by the linker, so
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221 we have no good way to determine at compile time what to do. */
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222
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223 #define R_LR 65
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224
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225 #ifdef __64BIT__
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226 #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \
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227 do { \
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228 if ((FS)->regs.reg[2].how == REG_UNSAVED) \
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229 { \
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230 unsigned int *insn \
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231 = (unsigned int *) \
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232 _Unwind_GetGR ((CTX), R_LR); \
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233 if (*insn == 0xE8410028) \
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234 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40); \
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235 } \
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236 } while (0)
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237 #else
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238 #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \
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239 do { \
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240 if ((FS)->regs.reg[2].how == REG_UNSAVED) \
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241 { \
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242 unsigned int *insn \
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243 = (unsigned int *) \
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244 _Unwind_GetGR ((CTX), R_LR); \
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245 if (*insn == 0x80410014) \
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246 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 20); \
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247 } \
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248 } while (0)
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249 #endif
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250
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251 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
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252
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253 /* Print subsidiary information on the compiler version in use. */
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254 #define TARGET_VERSION ;
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255
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256 /* No version of AIX fully supports AltiVec or 64-bit instructions in
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257 32-bit mode. */
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258 #define OS_MISSING_POWERPC64 1
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259 #define OS_MISSING_ALTIVEC 1
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260
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261 /* WINT_TYPE */
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262 #define WINT_TYPE "int"
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