aix.h revision 96263
1/* Definitions of target machine for GNU compiler, 2 for IBM RS/6000 POWER running AIX. 3 Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc. 4 5This file is part of GNU CC. 6 7GNU CC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GNU CC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GNU CC; see the file COPYING. If not, write to 19the Free Software Foundation, 59 Temple Place - Suite 330, 20Boston, 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/* The AIX linker will discard static constructors in object files before 27 collect has a chance to see them, so scan the object files directly. */ 28#define COLLECT_EXPORT_LIST 29 30/* Handle #pragma weak and #pragma pack. */ 31#define HANDLE_SYSV_PRAGMA 32 33/* This is the only version of nm that collect2 can work with. */ 34#define REAL_NM_FILE_NAME "/usr/ucb/nm" 35 36#define USER_LABEL_PREFIX "" 37/* Don't turn -B into -L if the argument specifies a relative file name. */ 38#define RELATIVE_PREFIX_NOT_LINKDIR 39 40/* Because of the above, we must have gcc search itself to find libgcc.a. */ 41#define LINK_LIBGCC_SPECIAL_1 42 43/* Names to predefine in the preprocessor for this target machine. */ 44#define CPP_PREDEFINES "-D_IBMR2 -D_POWER -D_AIX -D_AIX32 -D_LONG_LONG \ 45-Asystem=unix -Asystem=aix -Acpu=rs6000 -Amachine=rs6000" 46 47/* Define appropriate architecture macros for preprocessor depending on 48 target switches. */ 49 50#define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\ 51 %{ansi: -D_ANSI_C_SOURCE}\ 52 %(cpp_cpu)" 53 54#undef CPP_DEFAULT_SPEC 55#define CPP_DEFAULT_SPEC "-D_ARCH_PWR" 56 57#undef ASM_DEFAULT_SPEC 58#define ASM_DEFAULT_SPEC "" 59 60/* Tell the assembler to assume that all undefined names are external. 61 62 Don't do this until the fixed IBM assembler is more generally available. 63 When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL, 64 ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no 65 longer be needed. Also, the extern declaration of mcount in ASM_FILE_START 66 will no longer be needed. */ 67 68/* #define ASM_SPEC "-u %(asm_cpu)" */ 69 70/* Default location of syscalls.exp under AIX */ 71#ifndef CROSS_COMPILE 72#define LINK_SYSCALLS_SPEC "-bI:/lib/syscalls.exp" 73#else 74#define LINK_SYSCALLS_SPEC "" 75#endif 76 77/* Default location of libg.exp under AIX */ 78#ifndef CROSS_COMPILE 79#define LINK_LIBG_SPEC "-bexport:/usr/lib/libg.exp" 80#else 81#define LINK_LIBG_SPEC "" 82#endif 83 84/* Define the options for the binder: Start text at 512, align all segments 85 to 512 bytes, and warn if there is text relocation. 86 87 The -bhalt:4 option supposedly changes the level at which ld will abort, 88 but it also suppresses warnings about multiply defined symbols and is 89 used by the AIX cc command. So we use it here. 90 91 -bnodelcsect undoes a poor choice of default relating to multiply-defined 92 csects. See AIX documentation for more information about this. 93 94 -bM:SRE tells the linker that the output file is Shared REusable. Note 95 that to actually build a shared library you will also need to specify an 96 export list with the -Wl,-bE option. */ 97 98#define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\ 99%{static:-bnso %(link_syscalls) } \ 100%{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}" 101 102/* Profiled library versions are used by linking with special directories. */ 103#define LIB_SPEC "%{pg:-L/lib/profiled -L/usr/lib/profiled}\ 104%{p:-L/lib/profiled -L/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc" 105 106/* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */ 107#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ 108 (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \ 109 ? get_inner_array_type (FIELD) \ 110 : TREE_TYPE (FIELD)) == DFmode \ 111 ? MIN ((COMPUTED), 32) : (COMPUTED)) 112 113/* AIX increases natural record alignment to doubleword if the first 114 field is an FP double while the FP fields remain word aligned. */ 115#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ 116 ((TREE_CODE (STRUCT) == RECORD_TYPE \ 117 || TREE_CODE (STRUCT) == UNION_TYPE \ 118 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ 119 && TYPE_FIELDS (STRUCT) != 0 \ 120 && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode \ 121 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64) \ 122 : MAX ((COMPUTED), (SPECIFIED))) 123 124 125 126/* Indicate that jump tables go in the text section. */ 127 128#define JUMP_TABLES_IN_TEXT_SECTION 1 129 130/* Enable AIX XL compiler calling convention breakage compatibility. */ 131#undef TARGET_XL_CALL 132#define MASK_XL_CALL 0x40000000 133#define TARGET_XL_CALL (target_flags & MASK_XL_CALL) 134#undef SUBTARGET_SWITCHES 135#define SUBTARGET_SWITCHES \ 136 {"xl-call", MASK_XL_CALL, \ 137 N_("Always pass floating-point arguments in memory") }, \ 138 {"no-xl-call", - MASK_XL_CALL, \ 139 N_("Don't always pass floating-point arguments in memory") }, \ 140 SUBSUBTARGET_SWITCHES 141#define SUBSUBTARGET_SWITCHES 142 143/* Define any extra SPECS that the compiler needs to generate. */ 144#undef SUBTARGET_EXTRA_SPECS 145#define SUBTARGET_EXTRA_SPECS \ 146 { "link_syscalls", LINK_SYSCALLS_SPEC }, \ 147 { "link_libg", LINK_LIBG_SPEC } 148 149/* Define cutoff for using external functions to save floating point. */ 150#define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63) 151 152/* Optabs entries for the int->float routines and quad FP operations 153 using the standard AIX names. */ 154#define ADDTF3_LIBCALL "_xlqadd" 155#define DIVTF3_LIBCALL "_xlqdiv" 156#define MULTF3_LIBCALL "_xlqmul" 157#define SUBTF3_LIBCALL "_xlqsub" 158 159#define INIT_TARGET_OPTABS \ 160 do { \ 161 if (! TARGET_POWER2 && ! TARGET_POWERPC && TARGET_HARD_FLOAT) \ 162 { \ 163 fixdfsi_libfunc = init_one_libfunc (RS6000_ITRUNC); \ 164 fixunsdfsi_libfunc = init_one_libfunc (RS6000_UITRUNC); \ 165 } \ 166 if (TARGET_HARD_FLOAT) \ 167 { \ 168 add_optab->handlers[(int) TFmode].libfunc \ 169 = init_one_libfunc (ADDTF3_LIBCALL); \ 170 sub_optab->handlers[(int) TFmode].libfunc \ 171 = init_one_libfunc (SUBTF3_LIBCALL); \ 172 smul_optab->handlers[(int) TFmode].libfunc \ 173 = init_one_libfunc (MULTF3_LIBCALL); \ 174 sdiv_optab->handlers[(int) TFmode].libfunc \ 175 = init_one_libfunc (DIVTF3_LIBCALL); \ 176 } \ 177 } while (0) 178 179/* AIX always has a TOC. */ 180#define TARGET_NO_TOC 0 181#define TARGET_TOC 1 182 183#define FIXED_R2 1 184/* AIX allows r13 to be used. */ 185#define FIXED_R13 0 186 187/* __throw will restore its own return address to be the same as the 188 return address of the function that the throw is being made to. 189 This is unfortunate, because we want to check the original 190 return address to see if we need to restore the TOC. 191 So we have to squirrel it away with this. */ 192#define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init () 193 194#define PROFILE_HOOK(LABEL) output_profile_hook (LABEL) 195 196/* Print subsidiary information on the compiler version in use. */ 197#define TARGET_VERSION ; 198