1 /* Definitions of target machine for GNU compiler, 2 for IBM RS/6000 POWER running AIX. 3 Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it 8 under the terms of the GNU General Public License as published 9 by the Free Software Foundation; either version 2, or (at your 10 option) any later version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 15 License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING. If not, write to the 19 Free Software Foundation, 59 Temple Place - Suite 330, Boston, 20 MA 02111-1307, USA. */ 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 /* AIX does not support Altivec. */ 36 #undef TARGET_ALTIVEC 37 #define TARGET_ALTIVEC 0 38 #undef TARGET_ALTIVEC_ABI 39 #define TARGET_ALTIVEC_ABI 0 40 #undef TARGET_ALTIVEC_VRSAVE 41 #define TARGET_ALTIVEC_VRSAVE 0 42 43 /* The AIX linker will discard static constructors in object files before 44 collect has a chance to see them, so scan the object files directly. */ 45 #define COLLECT_EXPORT_LIST 46 47 /* Handle #pragma weak and #pragma pack. */ 48 #define HANDLE_SYSV_PRAGMA 1 49 50 /* This is the only version of nm that collect2 can work with. */ 51 #define REAL_NM_FILE_NAME "/usr/ucb/nm" 52 53 #define USER_LABEL_PREFIX "" 54 /* Don't turn -B into -L if the argument specifies a relative file name. */ 55 #define RELATIVE_PREFIX_NOT_LINKDIR 56 57 /* Because of the above, we must have gcc search itself to find libgcc.a. */ 58 #define LINK_LIBGCC_SPECIAL_1 59 60 /* Names to predefine in the preprocessor for this target machine. */ 61 #define TARGET_OS_CPP_BUILTINS() \ 62 do \ 63 { \ 64 builtin_define ("_IBMR2"); \ 65 builtin_define ("_POWER"); \ 66 builtin_define ("_AIX"); \ 67 builtin_define ("_AIX32"); \ 68 builtin_define ("_LONG_LONG"); \ 69 builtin_assert ("system=unix"); \ 70 builtin_assert ("system=aix"); \ 71 builtin_assert ("cpu=rs6000"); \ 72 builtin_assert ("machine=rs6000"); \ 73 } \ 74 while (0) 75 76 /* Define appropriate architecture macros for preprocessor depending on 77 target switches. */ 78 79 #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\ 80 %{ansi: -D_ANSI_C_SOURCE}" 81 82 #undef ASM_DEFAULT_SPEC 83 #define ASM_DEFAULT_SPEC "" 84 85 /* Tell the assembler to assume that all undefined names are external. 86 87 Don't do this until the fixed IBM assembler is more generally available. 88 When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL, 89 ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no 90 longer be needed. Also, the extern declaration of mcount in 91 rs6000_xcoff_file_start will no longer be needed. */ 92 93 /* #define ASM_SPEC "-u %(asm_cpu)" */ 94 95 /* Default location of syscalls.exp under AIX */ 96 #ifndef CROSS_COMPILE 97 #define LINK_SYSCALLS_SPEC "-bI:/lib/syscalls.exp" 98 #else 99 #define LINK_SYSCALLS_SPEC "" 100 #endif 101 102 /* Default location of libg.exp under AIX */ 103 #ifndef CROSS_COMPILE 104 #define LINK_LIBG_SPEC "-bexport:/usr/lib/libg.exp" 105 #else 106 #define LINK_LIBG_SPEC "" 107 #endif 108 109 /* Define the options for the binder: Start text at 512, align all segments 110 to 512 bytes, and warn if there is text relocation. 111 112 The -bhalt:4 option supposedly changes the level at which ld will abort, 113 but it also suppresses warnings about multiply defined symbols and is 114 used by the AIX cc command. So we use it here. 115 116 -bnodelcsect undoes a poor choice of default relating to multiply-defined 117 csects. See AIX documentation for more information about this. 118 119 -bM:SRE tells the linker that the output file is Shared REusable. Note 120 that to actually build a shared library you will also need to specify an 121 export list with the -Wl,-bE option. */ 122 123 #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\ 124 %{static:-bnso %(link_syscalls) } \ 125 %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}" 126 127 /* Profiled library versions are used by linking with special directories. */ 128 #define LIB_SPEC "%{pg:-L/lib/profiled -L/usr/lib/profiled}\ 129 %{p:-L/lib/profiled -L/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc" 130 131 /* This now supports a natural alignment mode. */ 132 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */ 133 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ 134 (TARGET_ALIGN_NATURAL ? (COMPUTED) : \ 135 (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \ 136 ? get_inner_array_type (FIELD) \ 137 : TREE_TYPE (FIELD)) == DFmode \ 138 ? MIN ((COMPUTED), 32) : (COMPUTED))) 139 140 /* AIX increases natural record alignment to doubleword if the first 141 field is an FP double while the FP fields remain word aligned. */ 142 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ 143 ((TREE_CODE (STRUCT) == RECORD_TYPE \ 144 || TREE_CODE (STRUCT) == UNION_TYPE \ 145 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ 146 && TARGET_ALIGN_NATURAL == 0 \ 147 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \ 148 : MAX ((COMPUTED), (SPECIFIED))) 149 150 /* The AIX ABI isn't explicit on whether aggregates smaller than a 151 word/doubleword should be padded upward or downward. One could 152 reasonably assume that they follow the normal rules for structure 153 layout treating the parameter area as any other block of memory, 154 then map the reg param area to registers, i.e., pad upward, which 155 is the way IBM Compilers for AIX behave. 156 Setting both of the following defines results in this behavior. */ 157 #define AGGREGATE_PADDING_FIXED 1 158 #define AGGREGATES_PAD_UPWARD_ALWAYS 1 159 160 /* We don't want anything in the reg parm area being passed on the 161 stack. */ 162 #define MUST_PASS_IN_STACK(MODE, TYPE) \ 163 ((TYPE) != 0 \ 164 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \ 165 || TREE_ADDRESSABLE (TYPE))) 166 167 /* Specify padding for the last element of a block move between 168 registers and memory. FIRST is nonzero if this is the only 169 element. */ 170 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \ 171 (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE)) 172 173 /* Indicate that jump tables go in the text section. */ 174 175 #define JUMP_TABLES_IN_TEXT_SECTION 1 176 177 /* Enable AIX XL compiler calling convention breakage compatibility. */ 178 #undef TARGET_XL_CALL 179 #define MASK_XL_CALL 0x40000000 180 #define TARGET_XL_CALL (target_flags & MASK_XL_CALL) 181 #undef SUBTARGET_SWITCHES 182 #define SUBTARGET_SWITCHES \ 183 {"xl-call", MASK_XL_CALL, \ 184 N_("Always pass floating-point arguments in memory") }, \ 185 {"no-xl-call", - MASK_XL_CALL, \ 186 N_("Don't always pass floating-point arguments in memory") }, \ 187 SUBSUBTARGET_SWITCHES 188 #define SUBSUBTARGET_SWITCHES 189 190 /* Define any extra SPECS that the compiler needs to generate. */ 191 #undef SUBTARGET_EXTRA_SPECS 192 #define SUBTARGET_EXTRA_SPECS \ 193 { "link_syscalls", LINK_SYSCALLS_SPEC }, \ 194 { "link_libg", LINK_LIBG_SPEC } 195 196 /* Define cutoff for using external functions to save floating point. */ 197 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63) 198 199 /* __throw will restore its own return address to be the same as the 200 return address of the function that the throw is being made to. 201 This is unfortunate, because we want to check the original 202 return address to see if we need to restore the TOC. 203 So we have to squirrel it away with this. */ 204 #define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init () 205 206 /* If the current unwind info (FS) does not contain explicit info 207 saving R2, then we have to do a minor amount of code reading to 208 figure out if it was saved. The big problem here is that the 209 code that does the save/restore is generated by the linker, so 210 we have no good way to determine at compile time what to do. */ 211 212 #ifdef __powerpc64__ 213 #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \ 214 do { \ 215 if ((FS)->regs.reg[2].how == REG_UNSAVED) \ 216 { \ 217 unsigned int *insn \ 218 = (unsigned int *) \ 219 _Unwind_GetGR ((CTX), LINK_REGISTER_REGNUM); \ 220 if (*insn == 0xE8410028) \ 221 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40); \ 222 } \ 223 } while (0) 224 #else 225 #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \ 226 do { \ 227 if ((FS)->regs.reg[2].how == REG_UNSAVED) \ 228 { \ 229 unsigned int *insn \ 230 = (unsigned int *) \ 231 _Unwind_GetGR ((CTX), LINK_REGISTER_REGNUM); \ 232 if (*insn == 0x80410014) \ 233 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 20); \ 234 } \ 235 } while (0) 236 #endif 237 238 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL) 239 240 /* Print subsidiary information on the compiler version in use. */ 241 #define TARGET_VERSION ; 242 243 /* No version of AIX fully supports AltiVec or 64-bit instructions in 244 32-bit mode. */ 245 #define OS_MISSING_POWERPC64 1 246 #define OS_MISSING_ALTIVEC 1 247