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bbd21807 | 1 | /* Definitions of target machine for GNU compiler, |
2 | for IBM RS/6000 POWER running AIX. | |
cfaf579d | 3 | Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
2107381f | 4 | Free Software Foundation, Inc. |
bbd21807 | 5 | |
3a5a28e2 | 6 | This file is part of GCC. |
bbd21807 | 7 | |
3a5a28e2 | 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 | |
038d1e19 | 10 | by the Free Software Foundation; either version 3, or (at your |
3a5a28e2 | 11 | option) any later version. |
bbd21807 | 12 | |
3a5a28e2 | 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. | |
bbd21807 | 17 | |
3a5a28e2 | 18 | You should have received a copy of the GNU General Public License |
038d1e19 | 19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
bbd21807 | 21 | |
22 | /* Yes! We are AIX! */ | |
23 | #define DEFAULT_ABI ABI_AIX | |
14c03a87 | 24 | #undef TARGET_AIX |
8eaf2dd1 | 25 | #define TARGET_AIX 1 |
14c03a87 | 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 | ||
09d643de | 35 | /* 32-bit and 64-bit AIX stack boundary is 128. */ |
36 | #undef STACK_BOUNDARY | |
37 | #define STACK_BOUNDARY 128 | |
38 | ||
baad77c2 | 39 | #undef TARGET_IEEEQUAD |
40 | #define TARGET_IEEEQUAD 0 | |
14c03a87 | 41 | |
3239b2ba | 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 | |
bbd21807 | 45 | |
912df756 | 46 | /* Issue assembly directives that create a reference to the given DWARF table |
47 | identifier label from the current function section. This is defined to | |
48 | ensure we drag frame frame tables associated with needed function bodies in | |
49 | a link with garbage collection activated. */ | |
50 | #define ASM_OUTPUT_DWARF_TABLE_REF rs6000_aix_asm_output_dwarf_table_ref | |
51 | ||
ee0125fb | 52 | /* Handle #pragma weak and #pragma pack. */ |
49f8be83 | 53 | #define HANDLE_SYSV_PRAGMA 1 |
ee0125fb | 54 | |
bbd21807 | 55 | /* This is the only version of nm that collect2 can work with. */ |
56 | #define REAL_NM_FILE_NAME "/usr/ucb/nm" | |
57 | ||
8eaf2dd1 | 58 | #define USER_LABEL_PREFIX "" |
4ee9c684 | 59 | |
bbd21807 | 60 | /* Don't turn -B into -L if the argument specifies a relative file name. */ |
61 | #define RELATIVE_PREFIX_NOT_LINKDIR | |
62 | ||
f457fb19 | 63 | /* Because of the above, we must have gcc search itself to find libgcc.a. */ |
64 | #define LINK_LIBGCC_SPECIAL_1 | |
bbd21807 | 65 | |
4ee9c684 | 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 | ||
f457fb19 | 90 | /* Names to predefine in the preprocessor for this target machine. */ |
26efa80d | 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 | } \ | |
5b2c8acb | 105 | while (0) |
bbd21807 | 106 | |
0744109f | 107 | /* Define appropriate architecture macros for preprocessor depending on |
108 | target switches. */ | |
109 | ||
110 | #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\ | |
b2d381e8 | 111 | %{ansi: -D_ANSI_C_SOURCE}" |
8eaf2dd1 | 112 | |
7cfb6ab6 | 113 | #define CC1_SPEC "%(cc1_cpu)" |
114 | ||
6beea24d | 115 | #undef ASM_DEFAULT_SPEC |
8eaf2dd1 | 116 | #define ASM_DEFAULT_SPEC "" |
117 | ||
bbd21807 | 118 | /* Tell the assembler to assume that all undefined names are external. |
119 | ||
120 | Don't do this until the fixed IBM assembler is more generally available. | |
121 | When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL, | |
122 | ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no | |
92c473b8 | 123 | longer be needed. Also, the extern declaration of mcount in |
124 | rs6000_xcoff_file_start will no longer be needed. */ | |
bbd21807 | 125 | |
126 | /* #define ASM_SPEC "-u %(asm_cpu)" */ | |
127 | ||
128 | /* Default location of syscalls.exp under AIX */ | |
5b69e2e1 | 129 | #define LINK_SYSCALLS_SPEC "-bI:%R/lib/syscalls.exp" |
bbd21807 | 130 | |
131 | /* Default location of libg.exp under AIX */ | |
5b69e2e1 | 132 | #define LINK_LIBG_SPEC "-bexport:%R/usr/lib/libg.exp" |
bbd21807 | 133 | |
134 | /* Define the options for the binder: Start text at 512, align all segments | |
135 | to 512 bytes, and warn if there is text relocation. | |
136 | ||
e2f08fad | 137 | The -bhalt:4 option supposedly changes the level at which ld will abort, |
bbd21807 | 138 | but it also suppresses warnings about multiply defined symbols and is |
139 | used by the AIX cc command. So we use it here. | |
140 | ||
141 | -bnodelcsect undoes a poor choice of default relating to multiply-defined | |
142 | csects. See AIX documentation for more information about this. | |
143 | ||
e2f08fad | 144 | -bM:SRE tells the linker that the output file is Shared REusable. Note |
bbd21807 | 145 | that to actually build a shared library you will also need to specify an |
146 | export list with the -Wl,-bE option. */ | |
147 | ||
148 | #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\ | |
149 | %{static:-bnso %(link_syscalls) } \ | |
150 | %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}" | |
151 | ||
152 | /* Profiled library versions are used by linking with special directories. */ | |
5b69e2e1 | 153 | #define LIB_SPEC "%{pg:-L%R/lib/profiled -L%R/usr/lib/profiled}\ |
154 | %{p:-L%R/lib/profiled -L%R/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc" | |
bbd21807 | 155 | |
76ee324f | 156 | /* Static linking with shared libstdc++ requires libsupc++ as well. */ |
c7e5ac45 | 157 | #define LIBSTDCXX_STATIC "-lsupc++" |
76ee324f | 158 | |
1a4e6801 | 159 | /* This now supports a natural alignment mode. */ |
3c8fd74f | 160 | /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */ |
161 | #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ | |
eec9c06d | 162 | ((TARGET_ALIGN_NATURAL == 0 \ |
163 | && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode) \ | |
164 | ? MIN ((COMPUTED), 32) \ | |
165 | : (COMPUTED)) | |
3c8fd74f | 166 | |
8eaf2dd1 | 167 | /* AIX increases natural record alignment to doubleword if the first |
168 | field is an FP double while the FP fields remain word aligned. */ | |
09d643de | 169 | #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ |
170 | ((TREE_CODE (STRUCT) == RECORD_TYPE \ | |
171 | || TREE_CODE (STRUCT) == UNION_TYPE \ | |
172 | || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ | |
173 | && TARGET_ALIGN_NATURAL == 0 \ | |
174 | ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \ | |
8eaf2dd1 | 175 | : MAX ((COMPUTED), (SPECIFIED))) |
176 | ||
b416fea8 | 177 | /* The AIX ABI isn't explicit on whether aggregates smaller than a |
178 | word/doubleword should be padded upward or downward. One could | |
179 | reasonably assume that they follow the normal rules for structure | |
180 | layout treating the parameter area as any other block of memory, | |
181 | then map the reg param area to registers, i.e., pad upward, which | |
182 | is the way IBM Compilers for AIX behave. | |
751e10d1 | 183 | Setting both of the following defines results in this behavior. */ |
b416fea8 | 184 | #define AGGREGATE_PADDING_FIXED 1 |
185 | #define AGGREGATES_PAD_UPWARD_ALWAYS 1 | |
186 | ||
b416fea8 | 187 | /* Specify padding for the last element of a block move between |
188 | registers and memory. FIRST is nonzero if this is the only | |
189 | element. */ | |
190 | #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \ | |
191 | (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE)) | |
192 | ||
bbd21807 | 193 | /* Indicate that jump tables go in the text section. */ |
194 | ||
195 | #define JUMP_TABLES_IN_TEXT_SECTION 1 | |
196 | ||
bbd21807 | 197 | /* Define any extra SPECS that the compiler needs to generate. */ |
198 | #undef SUBTARGET_EXTRA_SPECS | |
199 | #define SUBTARGET_EXTRA_SPECS \ | |
200 | { "link_syscalls", LINK_SYSCALLS_SPEC }, \ | |
201 | { "link_libg", LINK_LIBG_SPEC } | |
202 | ||
bbd21807 | 203 | /* Define cutoff for using external functions to save floating point. */ |
204 | #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63) | |
9ef25fc1 | 205 | /* And similarly for general purpose registers. */ |
206 | #define GP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 32) | |
bbd21807 | 207 | |
bbd21807 | 208 | /* __throw will restore its own return address to be the same as the |
209 | return address of the function that the throw is being made to. | |
210 | This is unfortunate, because we want to check the original | |
211 | return address to see if we need to restore the TOC. | |
212 | So we have to squirrel it away with this. */ | |
213 | #define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init () | |
214 | ||
31933f89 | 215 | /* If the current unwind info (FS) does not contain explicit info |
216 | saving R2, then we have to do a minor amount of code reading to | |
217 | figure out if it was saved. The big problem here is that the | |
218 | code that does the save/restore is generated by the linker, so | |
219 | we have no good way to determine at compile time what to do. */ | |
220 | ||
e18e5bf1 | 221 | #define R_LR 65 |
222 | ||
ccf7945b | 223 | #ifdef __64BIT__ |
31933f89 | 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 *) \ | |
e18e5bf1 | 230 | _Unwind_GetGR ((CTX), R_LR); \ |
31933f89 | 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 *) \ | |
e18e5bf1 | 242 | _Unwind_GetGR ((CTX), R_LR); \ |
31933f89 | 243 | if (*insn == 0x80410014) \ |
244 | _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 20); \ | |
245 | } \ | |
246 | } while (0) | |
247 | #endif | |
248 | ||
104d9861 | 249 | #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL) |
327811ee | 250 | |
251 | /* Print subsidiary information on the compiler version in use. */ | |
252 | #define TARGET_VERSION ; | |
bec4fa6a | 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 | |
c5a3a1ce | 258 | |
259 | /* WINT_TYPE */ | |
260 | #define WINT_TYPE "int" |