1 /* Definitions of target machine for GNU compiler, 2 for IBM RS/6000 POWER running AIX. 3 Copyright (C) 2000-2019 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 3, 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 COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 /* Yes! We are AIX! */ 22 #define DEFAULT_ABI ABI_AIX 23 #undef TARGET_AIX 24 #define TARGET_AIX 1 25 26 /* System headers are not C++-aware. */ 27 #define SYSTEM_IMPLICIT_EXTERN_C 1 28 29 /* Linux64.h wants to redefine TARGET_AIX based on -m64, but it can't be used 30 in the #if conditional in options-default.h, so provide another macro. */ 31 #undef TARGET_AIX_OS 32 #define TARGET_AIX_OS 1 33 34 /* AIX always has a TOC. */ 35 #define TARGET_NO_TOC 0 36 #define TARGET_TOC 1 37 #define FIXED_R2 1 38 39 /* AIX allows r13 to be used in 32-bit mode. */ 40 #define FIXED_R13 0 41 42 /* 32-bit and 64-bit AIX stack boundary is 128. */ 43 #undef STACK_BOUNDARY 44 #define STACK_BOUNDARY 128 45 46 /* Offset within stack frame to start allocating local variables at. 47 If FRAME_GROWS_DOWNWARD, this is the offset to the END of the 48 first local allocated. Otherwise, it is the offset to the BEGINNING 49 of the first local allocated. 50 51 On the RS/6000, the frame pointer is the same as the stack pointer, 52 except for dynamic allocations. So we start after the fixed area and 53 outgoing parameter area. 54 55 If the function uses dynamic stack space (CALLS_ALLOCA is set), that 56 space needs to be aligned to STACK_BOUNDARY, i.e. the sum of the 57 sizes of the fixed area and the parameter area must be a multiple of 58 STACK_BOUNDARY. */ 59 60 #undef RS6000_STARTING_FRAME_OFFSET 61 #define RS6000_STARTING_FRAME_OFFSET \ 62 (cfun->calls_alloca \ 63 ? RS6000_ALIGN (crtl->outgoing_args_size + RS6000_SAVE_AREA, 16) \ 64 : (RS6000_ALIGN (crtl->outgoing_args_size, 16) + RS6000_SAVE_AREA)) 65 66 /* Offset from the stack pointer register to an item dynamically 67 allocated on the stack, e.g., by `alloca'. 68 69 The default value for this macro is `STACK_POINTER_OFFSET' plus the 70 length of the outgoing arguments. The default is correct for most 71 machines. See `function.c' for details. 72 73 This value must be a multiple of STACK_BOUNDARY (hard coded in 74 `emit-rtl.c'). */ 75 #undef STACK_DYNAMIC_OFFSET 76 #define STACK_DYNAMIC_OFFSET(FUNDECL) \ 77 RS6000_ALIGN (crtl->outgoing_args_size.to_constant () \ 78 + STACK_POINTER_OFFSET, 16) 79 80 #undef TARGET_IEEEQUAD 81 #define TARGET_IEEEQUAD 0 82 83 #undef TARGET_IEEEQUAD_DEFAULT 84 #define TARGET_IEEEQUAD_DEFAULT 0 85 86 /* The AIX linker will discard static constructors in object files before 87 collect has a chance to see them, so scan the object files directly. */ 88 #define COLLECT_EXPORT_LIST 89 90 /* On AIX, initialisers specified with -binitfini are called in breadth-first 91 order. 92 e.g. if a.out depends on lib1.so, the init function for a.out is called before 93 the init function for lib1.so. 94 95 To ensure global C++ constructors in linked libraries are run before global 96 C++ constructors from the current module, there is additional symbol scanning 97 logic in collect2. 98 99 The global initialiser/finaliser functions are named __GLOBAL_AIXI_{libname} 100 and __GLOBAL_AIXD_{libname} and are exported from each shared library. 101 102 collect2 will detect these symbols when they exist in shared libraries that 103 the current program is being linked against. All such initiliser functions 104 will be called prior to the constructors of the current program, and 105 finaliser functions called after destructors. 106 107 Reference counting generated by collect2 will ensure that constructors are 108 only invoked once in the case of multiple dependencies on a library. 109 110 -binitfini is still used in parallel to this solution. 111 This handles the case where a library is loaded through dlopen(), and also 112 handles the option -blazy. 113 */ 114 #define COLLECT_SHARED_INIT_FUNC(STREAM, FUNC) \ 115 fprintf ((STREAM), "void %s() {\n\t%s();\n}\n", aix_shared_initname, (FUNC)) 116 #define COLLECT_SHARED_FINI_FUNC(STREAM, FUNC) \ 117 fprintf ((STREAM), "void %s() {\n\t%s();\n}\n", aix_shared_fininame, (FUNC)) 118 119 #if HAVE_AS_REF 120 /* Issue assembly directives that create a reference to the given DWARF table 121 identifier label from the current function section. This is defined to 122 ensure we drag frame tables associated with needed function bodies in 123 a link with garbage collection activated. */ 124 #define ASM_OUTPUT_DWARF_TABLE_REF rs6000_aix_asm_output_dwarf_table_ref 125 #endif 126 127 /* This is the only version of nm that collect2 can work with. */ 128 #define REAL_NM_FILE_NAME "/usr/ucb/nm" 129 130 #define USER_LABEL_PREFIX "" 131 132 /* Don't turn -B into -L if the argument specifies a relative file name. */ 133 #define RELATIVE_PREFIX_NOT_LINKDIR 134 135 /* Because of the above, we must have gcc search itself to find libgcc.a. */ 136 #define LINK_LIBGCC_SPECIAL_1 137 138 /* Names to predefine in the preprocessor for this target machine. */ 139 #define TARGET_OS_AIX_CPP_BUILTINS() \ 140 do \ 141 { \ 142 builtin_define ("_IBMR2"); \ 143 builtin_define ("_POWER"); \ 144 builtin_define ("__unix__"); \ 145 builtin_define ("_AIX"); \ 146 builtin_define ("_AIX32"); \ 147 builtin_define ("_AIX41"); \ 148 builtin_define ("_LONG_LONG"); \ 149 if (TARGET_LONG_DOUBLE_128) \ 150 builtin_define ("__LONGDOUBLE128"); \ 151 builtin_assert ("system=unix"); \ 152 builtin_assert ("system=aix"); \ 153 if (TARGET_64BIT) \ 154 { \ 155 builtin_define ("__PPC__"); \ 156 builtin_define ("__PPC64__"); \ 157 builtin_define ("__powerpc__"); \ 158 builtin_define ("__powerpc64__"); \ 159 builtin_assert ("cpu=powerpc64"); \ 160 builtin_assert ("machine=powerpc64"); \ 161 } \ 162 else \ 163 { \ 164 builtin_define ("__PPC__"); \ 165 builtin_define ("__powerpc__"); \ 166 builtin_assert ("cpu=powerpc"); \ 167 builtin_assert ("machine=powerpc"); \ 168 } \ 169 } \ 170 while (0) 171 172 /* Define appropriate architecture macros for preprocessor depending on 173 target switches. */ 174 175 #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\ 176 %{ansi: -D_ANSI_C_SOURCE}" 177 178 #define CC1_SPEC "%(cc1_cpu)" 179 180 #undef ASM_DEFAULT_SPEC 181 #define ASM_DEFAULT_SPEC "" 182 183 /* Tell the assembler to assume that all undefined names are external. 184 185 Don't do this until the fixed IBM assembler is more generally available. 186 When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL, 187 ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no 188 longer be needed. Also, the extern declaration of mcount in 189 rs6000_xcoff_file_start will no longer be needed. */ 190 191 /* #define ASM_SPEC "-u %(asm_cpu)" */ 192 193 /* Default location of syscalls.exp under AIX */ 194 #define LINK_SYSCALLS_SPEC "-bI:%R/lib/syscalls.exp" 195 196 /* Default location of libg.exp under AIX */ 197 #define LINK_LIBG_SPEC "-bexport:%R/usr/lib/libg.exp" 198 199 /* Define the options for the binder: Start text at 512, align all segments 200 to 512 bytes, and warn if there is text relocation. 201 202 The -bhalt:4 option supposedly changes the level at which ld will abort, 203 but it also suppresses warnings about multiply defined symbols and is 204 used by the AIX cc command. So we use it here. 205 206 -bnodelcsect undoes a poor choice of default relating to multiply-defined 207 csects. See AIX documentation for more information about this. 208 209 -bM:SRE tells the linker that the output file is Shared REusable. Note 210 that to actually build a shared library you will also need to specify an 211 export list with the -Wl,-bE option. */ 212 213 #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\ 214 %{static:-bnso %(link_syscalls) } \ 215 %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}" 216 217 /* Profiled library versions are used by linking with special directories. */ 218 #define LIB_SPEC "%{pg:-L%R/lib/profiled -L%R/usr/lib/profiled}\ 219 %{p:-L%R/lib/profiled -L%R/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc" 220 221 /* Static linking with shared libstdc++ requires libsupc++ as well. */ 222 #define LIBSTDCXX_STATIC "supc++" 223 224 /* This now supports a natural alignment mode. */ 225 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */ 226 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \ 227 ((TARGET_ALIGN_NATURAL == 0 \ 228 && TYPE_MODE (strip_array_types (TYPE)) == DFmode) \ 229 ? MIN ((COMPUTED), 32) \ 230 : (COMPUTED)) 231 232 /* AIX increases natural record alignment to doubleword if the first 233 field is an FP double while the FP fields remain word aligned. */ 234 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ 235 ((TREE_CODE (STRUCT) == RECORD_TYPE \ 236 || TREE_CODE (STRUCT) == UNION_TYPE \ 237 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ 238 && TARGET_ALIGN_NATURAL == 0 \ 239 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \ 240 : MAX ((COMPUTED), (SPECIFIED))) 241 242 /* The AIX ABI isn't explicit on whether aggregates smaller than a 243 word/doubleword should be padded upward or downward. One could 244 reasonably assume that they follow the normal rules for structure 245 layout treating the parameter area as any other block of memory, 246 then map the reg param area to registers, i.e., pad upward, which 247 is the way IBM Compilers for AIX behave. 248 Setting both of the following defines results in this behavior. */ 249 #define AGGREGATE_PADDING_FIXED 1 250 #define AGGREGATES_PAD_UPWARD_ALWAYS 1 251 252 /* Specify padding for the last element of a block move between 253 registers and memory. FIRST is nonzero if this is the only 254 element. */ 255 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \ 256 (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE)) 257 258 /* Indicate that jump tables go in the text section. */ 259 260 #define JUMP_TABLES_IN_TEXT_SECTION 1 261 262 /* Define any extra SPECS that the compiler needs to generate. */ 263 #undef SUBTARGET_EXTRA_SPECS 264 #define SUBTARGET_EXTRA_SPECS \ 265 { "link_syscalls", LINK_SYSCALLS_SPEC }, \ 266 { "link_libg", LINK_LIBG_SPEC } 267 268 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL) 269 270 /* No version of AIX fully supports AltiVec or 64-bit instructions in 271 32-bit mode. */ 272 #define OS_MISSING_POWERPC64 1 273 #define OS_MISSING_ALTIVEC 1 274 275 /* WINT_TYPE */ 276 #define WINT_TYPE "int" 277 278 /* Static stack checking is supported by means of probes. */ 279 #define STACK_CHECK_STATIC_BUILTIN 1 280 281 /* Use standard DWARF numbering for DWARF debugging information. */ 282 #define RS6000_USE_DWARF_NUMBERING 283 284