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 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 2, 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 COPYING. If not, write to the 20 Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23/* Yes! We are AIX! */ 24#define DEFAULT_ABI ABI_AIX 25#undef TARGET_AIX 26#define TARGET_AIX 1 27 28/* AIX always has a TOC. */ 29#define TARGET_NO_TOC 0 30#define TARGET_TOC 1 31#define FIXED_R2 1 32 33/* AIX allows r13 to be used in 32-bit mode. */ 34#define FIXED_R13 0 35 36/* 32-bit and 64-bit AIX stack boundary is 128. */ 37#undef STACK_BOUNDARY 38#define STACK_BOUNDARY 128 39 40/* AIX does not support Altivec. */ 41#undef TARGET_ALTIVEC 42#define TARGET_ALTIVEC 0 43#undef TARGET_ALTIVEC_ABI 44#define TARGET_ALTIVEC_ABI 0 45#undef TARGET_IEEEQUAD 46#define TARGET_IEEEQUAD 0 47 48/* The AIX linker will discard static constructors in object files before 49 collect has a chance to see them, so scan the object files directly. */ 50#define COLLECT_EXPORT_LIST 51 52/* Handle #pragma weak and #pragma pack. */ 53#define HANDLE_SYSV_PRAGMA 1 54 55/* This is the only version of nm that collect2 can work with. */ 56#define REAL_NM_FILE_NAME "/usr/ucb/nm" 57 58#define USER_LABEL_PREFIX "" 59 60/* Don't turn -B into -L if the argument specifies a relative file name. */ 61#define RELATIVE_PREFIX_NOT_LINKDIR 62 63/* Because of the above, we must have gcc search itself to find libgcc.a. */ 64#define LINK_LIBGCC_SPECIAL_1 65 66#define MFWRAP_SPEC " %{static: %{fmudflap|fmudflapth: \ 67 -brename:malloc,__wrap_malloc -brename:__real_malloc,malloc \ 68 -brename:free,__wrap_free -brename:__real_free,free \ 69 -brename:calloc,__wrap_calloc -brename:__real_calloc,calloc \ 70 -brename:realloc,__wrap_realloc -brename:__real_realloc,realloc \ 71 -brename:mmap,__wrap_mmap -brename:__real_mmap,mmap \ 72 -brename:munmap,__wrap_munmap -brename:__real_munmap,munmap \ 73 -brename:alloca,__wrap_alloca -brename:__real_alloca,alloca \ 74} %{fmudflapth: \ 75 -brename:pthread_create,__wrap_pthread_create \ 76 -brename:__real_pthread_create,pthread_create \ 77 -brename:pthread_join,__wrap_pthread_join \ 78 -brename:__real_pthread_join,pthread_join \ 79 -brename:pthread_exit,__wrap_pthread_exit \ 80 -brename:__real_pthread_exit,pthread_exit \ 81}} %{fmudflap|fmudflapth: \ 82 -brename:main,__wrap_main -brename:__real_main,main \ 83}" 84 85#define MFLIB_SPEC " %{fmudflap: -lmudflap \ 86 %{static:%(link_gcc_c_sequence) -lmudflap}} \ 87 %{fmudflapth: -lmudflapth -lpthread \ 88 %{static:%(link_gcc_c_sequence) -lmudflapth}} " 89 90/* Names to predefine in the preprocessor for this target machine. */ 91#define TARGET_OS_AIX_CPP_BUILTINS() \ 92 do \ 93 { \ 94 builtin_define ("_IBMR2"); \ 95 builtin_define ("_POWER"); \ 96 builtin_define ("_AIX"); \ 97 builtin_define ("_AIX32"); \ 98 builtin_define ("_AIX41"); \ 99 builtin_define ("_LONG_LONG"); \ 100 if (TARGET_LONG_DOUBLE_128) \ 101 builtin_define ("__LONGDOUBLE128"); \ 102 builtin_assert ("system=unix"); \ 103 builtin_assert ("system=aix"); \ 104 } \ 105 while (0) 106 107/* Define appropriate architecture macros for preprocessor depending on 108 target switches. */ 109 110#define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\ 111 %{ansi: -D_ANSI_C_SOURCE}" 112 113#undef ASM_DEFAULT_SPEC 114#define ASM_DEFAULT_SPEC "" 115 116/* Tell the assembler to assume that all undefined names are external. 117 118 Don't do this until the fixed IBM assembler is more generally available. 119 When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL, 120 ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no 121 longer be needed. Also, the extern declaration of mcount in 122 rs6000_xcoff_file_start will no longer be needed. */ 123 124/* #define ASM_SPEC "-u %(asm_cpu)" */ 125 126/* Default location of syscalls.exp under AIX */ 127#ifndef CROSS_DIRECTORY_STRUCTURE 128#define LINK_SYSCALLS_SPEC "-bI:/lib/syscalls.exp" 129#else 130#define LINK_SYSCALLS_SPEC "" 131#endif 132 133/* Default location of libg.exp under AIX */ 134#ifndef CROSS_DIRECTORY_STRUCTURE 135#define LINK_LIBG_SPEC "-bexport:/usr/lib/libg.exp" 136#else 137#define LINK_LIBG_SPEC "" 138#endif 139 140/* Define the options for the binder: Start text at 512, align all segments 141 to 512 bytes, and warn if there is text relocation. 142 143 The -bhalt:4 option supposedly changes the level at which ld will abort, 144 but it also suppresses warnings about multiply defined symbols and is 145 used by the AIX cc command. So we use it here. 146 147 -bnodelcsect undoes a poor choice of default relating to multiply-defined 148 csects. See AIX documentation for more information about this. 149 150 -bM:SRE tells the linker that the output file is Shared REusable. Note 151 that to actually build a shared library you will also need to specify an 152 export list with the -Wl,-bE option. */ 153 154#define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\ 155%{static:-bnso %(link_syscalls) } \ 156%{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}" 157 158/* Profiled library versions are used by linking with special directories. */ 159#define LIB_SPEC "%{pg:-L/lib/profiled -L/usr/lib/profiled}\ 160%{p:-L/lib/profiled -L/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc" 161 162/* This now supports a natural alignment mode. */ 163/* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */ 164#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ 165 (TARGET_ALIGN_NATURAL ? (COMPUTED) : \ 166 (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \ 167 ? get_inner_array_type (FIELD) \ 168 : TREE_TYPE (FIELD)) == DFmode \ 169 ? MIN ((COMPUTED), 32) : (COMPUTED))) 170 171/* AIX increases natural record alignment to doubleword if the first 172 field is an FP double while the FP fields remain word aligned. */ 173#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ 174 ((TREE_CODE (STRUCT) == RECORD_TYPE \ 175 || TREE_CODE (STRUCT) == UNION_TYPE \ 176 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ 177 && TARGET_ALIGN_NATURAL == 0 \ 178 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \ 179 : MAX ((COMPUTED), (SPECIFIED))) 180 181/* The AIX ABI isn't explicit on whether aggregates smaller than a 182 word/doubleword should be padded upward or downward. One could 183 reasonably assume that they follow the normal rules for structure 184 layout treating the parameter area as any other block of memory, 185 then map the reg param area to registers, i.e., pad upward, which 186 is the way IBM Compilers for AIX behave. 187 Setting both of the following defines results in this behavior. */ 188#define AGGREGATE_PADDING_FIXED 1 189#define AGGREGATES_PAD_UPWARD_ALWAYS 1 190 191/* Specify padding for the last element of a block move between 192 registers and memory. FIRST is nonzero if this is the only 193 element. */ 194#define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \ 195 (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE)) 196 197/* Indicate that jump tables go in the text section. */ 198 199#define JUMP_TABLES_IN_TEXT_SECTION 1 200 201/* Define any extra SPECS that the compiler needs to generate. */ 202#undef SUBTARGET_EXTRA_SPECS 203#define SUBTARGET_EXTRA_SPECS \ 204 { "link_syscalls", LINK_SYSCALLS_SPEC }, \ 205 { "link_libg", LINK_LIBG_SPEC } 206 207/* Define cutoff for using external functions to save floating point. */ 208#define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63) 209 210/* __throw will restore its own return address to be the same as the 211 return address of the function that the throw is being made to. 212 This is unfortunate, because we want to check the original 213 return address to see if we need to restore the TOC. 214 So we have to squirrel it away with this. */ 215#define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init () 216 217/* If the current unwind info (FS) does not contain explicit info 218 saving R2, then we have to do a minor amount of code reading to 219 figure out if it was saved. The big problem here is that the 220 code that does the save/restore is generated by the linker, so 221 we have no good way to determine at compile time what to do. */ 222 223#ifdef __64BIT__ 224#define MD_FROB_UPDATE_CONTEXT(CTX, FS) \ 225 do { \ 226 if ((FS)->regs.reg[2].how == REG_UNSAVED) \ 227 { \ 228 unsigned int *insn \ 229 = (unsigned int *) \ 230 _Unwind_GetGR ((CTX), LINK_REGISTER_REGNUM); \ 231 if (*insn == 0xE8410028) \ 232 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40); \ 233 } \ 234 } while (0) 235#else 236#define MD_FROB_UPDATE_CONTEXT(CTX, FS) \ 237 do { \ 238 if ((FS)->regs.reg[2].how == REG_UNSAVED) \ 239 { \ 240 unsigned int *insn \ 241 = (unsigned int *) \ 242 _Unwind_GetGR ((CTX), LINK_REGISTER_REGNUM); \ 243 if (*insn == 0x80410014) \ 244 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 20); \ 245 } \ 246 } while (0) 247#endif 248 249#define PROFILE_HOOK(LABEL) output_profile_hook (LABEL) 250 251/* Print subsidiary information on the compiler version in use. */ 252#define TARGET_VERSION ; 253 254/* No version of AIX fully supports AltiVec or 64-bit instructions in 255 32-bit mode. */ 256#define OS_MISSING_POWERPC64 1 257#define OS_MISSING_ALTIVEC 1 258 259/* WINT_TYPE */ 260#define WINT_TYPE "int" 261