1 /* Definitions of target machine for GNU compiler, 2 for IBM RS/6000 POWER running AIX. 3 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010 4 Free Software Foundation, Inc. 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it 9 under the terms of the GNU General Public License as published 10 by the Free Software Foundation; either version 3, or (at your 11 option) any later version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 16 License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 /* Yes! We are AIX! */ 23 #define DEFAULT_ABI ABI_AIX 24 #undef TARGET_AIX 25 #define TARGET_AIX 1 26 27 /* AIX always has a TOC. */ 28 #define TARGET_NO_TOC 0 29 #define TARGET_TOC 1 30 #define FIXED_R2 1 31 32 /* AIX allows r13 to be used in 32-bit mode. */ 33 #define FIXED_R13 0 34 35 /* 32-bit and 64-bit AIX stack boundary is 128. */ 36 #undef STACK_BOUNDARY 37 #define STACK_BOUNDARY 128 38 39 #undef TARGET_IEEEQUAD 40 #define TARGET_IEEEQUAD 0 41 42 /* The AIX linker will discard static constructors in object files before 43 collect has a chance to see them, so scan the object files directly. */ 44 #define COLLECT_EXPORT_LIST 45 46 #if HAVE_AS_REF 47 /* Issue assembly directives that create a reference to the given DWARF table 48 identifier label from the current function section. This is defined to 49 ensure we drag frame frame tables associated with needed function bodies in 50 a link with garbage collection activated. */ 51 #define ASM_OUTPUT_DWARF_TABLE_REF rs6000_aix_asm_output_dwarf_table_ref 52 #endif 53 54 /* Handle #pragma weak and #pragma pack. */ 55 #define HANDLE_SYSV_PRAGMA 1 56 57 /* This is the only version of nm that collect2 can work with. */ 58 #define REAL_NM_FILE_NAME "/usr/ucb/nm" 59 60 #define USER_LABEL_PREFIX "" 61 62 /* Don't turn -B into -L if the argument specifies a relative file name. */ 63 #define RELATIVE_PREFIX_NOT_LINKDIR 64 65 /* Because of the above, we must have gcc search itself to find libgcc.a. */ 66 #define LINK_LIBGCC_SPECIAL_1 67 68 #define MFWRAP_SPEC " %{static: %{fmudflap|fmudflapth: \ 69 -brename:malloc,__wrap_malloc -brename:__real_malloc,malloc \ 70 -brename:free,__wrap_free -brename:__real_free,free \ 71 -brename:calloc,__wrap_calloc -brename:__real_calloc,calloc \ 72 -brename:realloc,__wrap_realloc -brename:__real_realloc,realloc \ 73 -brename:mmap,__wrap_mmap -brename:__real_mmap,mmap \ 74 -brename:munmap,__wrap_munmap -brename:__real_munmap,munmap \ 75 -brename:alloca,__wrap_alloca -brename:__real_alloca,alloca \ 76 } %{fmudflapth: \ 77 -brename:pthread_create,__wrap_pthread_create \ 78 -brename:__real_pthread_create,pthread_create \ 79 -brename:pthread_join,__wrap_pthread_join \ 80 -brename:__real_pthread_join,pthread_join \ 81 -brename:pthread_exit,__wrap_pthread_exit \ 82 -brename:__real_pthread_exit,pthread_exit \ 83 }} %{fmudflap|fmudflapth: \ 84 -brename:main,__wrap_main -brename:__real_main,main \ 85 }" 86 87 #define MFLIB_SPEC " %{fmudflap: -lmudflap \ 88 %{static:%(link_gcc_c_sequence) -lmudflap}} \ 89 %{fmudflapth: -lmudflapth -lpthread \ 90 %{static:%(link_gcc_c_sequence) -lmudflapth}} " 91 92 /* Names to predefine in the preprocessor for this target machine. */ 93 #define TARGET_OS_AIX_CPP_BUILTINS() \ 94 do \ 95 { \ 96 builtin_define ("_IBMR2"); \ 97 builtin_define ("_POWER"); \ 98 builtin_define ("_AIX"); \ 99 builtin_define ("_AIX32"); \ 100 builtin_define ("_AIX41"); \ 101 builtin_define ("_LONG_LONG"); \ 102 if (TARGET_LONG_DOUBLE_128) \ 103 builtin_define ("__LONGDOUBLE128"); \ 104 builtin_assert ("system=unix"); \ 105 builtin_assert ("system=aix"); \ 106 } \ 107 while (0) 108 109 /* Define appropriate architecture macros for preprocessor depending on 110 target switches. */ 111 112 #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\ 113 %{ansi: -D_ANSI_C_SOURCE}" 114 115 #define CC1_SPEC "%(cc1_cpu)" 116 117 #undef ASM_DEFAULT_SPEC 118 #define ASM_DEFAULT_SPEC "" 119 120 /* Tell the assembler to assume that all undefined names are external. 121 122 Don't do this until the fixed IBM assembler is more generally available. 123 When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL, 124 ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no 125 longer be needed. Also, the extern declaration of mcount in 126 rs6000_xcoff_file_start will no longer be needed. */ 127 128 /* #define ASM_SPEC "-u %(asm_cpu)" */ 129 130 /* Default location of syscalls.exp under AIX */ 131 #define LINK_SYSCALLS_SPEC "-bI:%R/lib/syscalls.exp" 132 133 /* Default location of libg.exp under AIX */ 134 #define LINK_LIBG_SPEC "-bexport:%R/usr/lib/libg.exp" 135 136 /* Define the options for the binder: Start text at 512, align all segments 137 to 512 bytes, and warn if there is text relocation. 138 139 The -bhalt:4 option supposedly changes the level at which ld will abort, 140 but it also suppresses warnings about multiply defined symbols and is 141 used by the AIX cc command. So we use it here. 142 143 -bnodelcsect undoes a poor choice of default relating to multiply-defined 144 csects. See AIX documentation for more information about this. 145 146 -bM:SRE tells the linker that the output file is Shared REusable. Note 147 that to actually build a shared library you will also need to specify an 148 export list with the -Wl,-bE option. */ 149 150 #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\ 151 %{static:-bnso %(link_syscalls) } \ 152 %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}" 153 154 /* Profiled library versions are used by linking with special directories. */ 155 #define LIB_SPEC "%{pg:-L%R/lib/profiled -L%R/usr/lib/profiled}\ 156 %{p:-L%R/lib/profiled -L%R/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc" 157 158 /* Static linking with shared libstdc++ requires libsupc++ as well. */ 159 #define LIBSTDCXX_STATIC "-lsupc++" 160 161 /* This now supports a natural alignment mode. */ 162 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */ 163 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ 164 ((TARGET_ALIGN_NATURAL == 0 \ 165 && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode) \ 166 ? MIN ((COMPUTED), 32) \ 167 : (COMPUTED)) 168 169 /* AIX increases natural record alignment to doubleword if the first 170 field is an FP double while the FP fields remain word aligned. */ 171 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ 172 ((TREE_CODE (STRUCT) == RECORD_TYPE \ 173 || TREE_CODE (STRUCT) == UNION_TYPE \ 174 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ 175 && TARGET_ALIGN_NATURAL == 0 \ 176 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \ 177 : MAX ((COMPUTED), (SPECIFIED))) 178 179 /* The AIX ABI isn't explicit on whether aggregates smaller than a 180 word/doubleword should be padded upward or downward. One could 181 reasonably assume that they follow the normal rules for structure 182 layout treating the parameter area as any other block of memory, 183 then map the reg param area to registers, i.e., pad upward, which 184 is the way IBM Compilers for AIX behave. 185 Setting both of the following defines results in this behavior. */ 186 #define AGGREGATE_PADDING_FIXED 1 187 #define AGGREGATES_PAD_UPWARD_ALWAYS 1 188 189 /* Specify padding for the last element of a block move between 190 registers and memory. FIRST is nonzero if this is the only 191 element. */ 192 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \ 193 (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE)) 194 195 /* Indicate that jump tables go in the text section. */ 196 197 #define JUMP_TABLES_IN_TEXT_SECTION 1 198 199 /* Define any extra SPECS that the compiler needs to generate. */ 200 #undef SUBTARGET_EXTRA_SPECS 201 #define SUBTARGET_EXTRA_SPECS \ 202 { "link_syscalls", LINK_SYSCALLS_SPEC }, \ 203 { "link_libg", LINK_LIBG_SPEC } 204 205 /* Define cutoff for using external functions to save floating point. */ 206 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63) 207 /* And similarly for general purpose registers. */ 208 #define GP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 32) 209 210 /* If the current unwind info (FS) does not contain explicit info 211 saving R2, then we have to do a minor amount of code reading to 212 figure out if it was saved. The big problem here is that the 213 code that does the save/restore is generated by the linker, so 214 we have no good way to determine at compile time what to do. */ 215 216 #define R_LR 65 217 218 #ifdef __64BIT__ 219 #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \ 220 do { \ 221 if ((FS)->regs.reg[2].how == REG_UNSAVED) \ 222 { \ 223 unsigned int *insn \ 224 = (unsigned int *) \ 225 _Unwind_GetGR ((CTX), R_LR); \ 226 if (*insn == 0xE8410028) \ 227 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40); \ 228 } \ 229 } while (0) 230 #else 231 #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \ 232 do { \ 233 if ((FS)->regs.reg[2].how == REG_UNSAVED) \ 234 { \ 235 unsigned int *insn \ 236 = (unsigned int *) \ 237 _Unwind_GetGR ((CTX), R_LR); \ 238 if (*insn == 0x80410014) \ 239 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 20); \ 240 } \ 241 } while (0) 242 #endif 243 244 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL) 245 246 /* Print subsidiary information on the compiler version in use. */ 247 #define TARGET_VERSION ; 248 249 /* No version of AIX fully supports AltiVec or 64-bit instructions in 250 32-bit mode. */ 251 #define OS_MISSING_POWERPC64 1 252 #define OS_MISSING_ALTIVEC 1 253 254 /* WINT_TYPE */ 255 #define WINT_TYPE "int" 256