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9ebbca7d GK |
1 | /* Definitions of target machine for GNU compiler, |
2 | for IBM RS/6000 POWER running AIX. | |
d1e082c2 | 3 | Copyright (C) 2000-2013 Free Software Foundation, Inc. |
9ebbca7d | 4 | |
5de601cf | 5 | This file is part of GCC. |
9ebbca7d | 6 | |
5de601cf NC |
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 | |
2f83c7d6 | 9 | by the Free Software Foundation; either version 3, or (at your |
5de601cf | 10 | option) any later version. |
9ebbca7d | 11 | |
5de601cf NC |
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. | |
9ebbca7d | 16 | |
5de601cf | 17 | You should have received a copy of the GNU General Public License |
2f83c7d6 NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
9ebbca7d GK |
20 | |
21 | /* Yes! We are AIX! */ | |
22 | #define DEFAULT_ABI ABI_AIX | |
774b5662 | 23 | #undef TARGET_AIX |
2bfcf297 | 24 | #define TARGET_AIX 1 |
774b5662 | 25 | |
78009d9f MM |
26 | /* Linux64.h wants to redefine TARGET_AIX based on -m64, but it can't be used |
27 | in the #if conditional in options-default.h, so provide another macro. */ | |
146d930b | 28 | #undef TARGET_AIX_OS |
78009d9f MM |
29 | #define TARGET_AIX_OS 1 |
30 | ||
774b5662 DE |
31 | /* AIX always has a TOC. */ |
32 | #define TARGET_NO_TOC 0 | |
33 | #define TARGET_TOC 1 | |
34 | #define FIXED_R2 1 | |
35 | ||
36 | /* AIX allows r13 to be used in 32-bit mode. */ | |
37 | #define FIXED_R13 0 | |
38 | ||
4e9d3943 DE |
39 | /* 32-bit and 64-bit AIX stack boundary is 128. */ |
40 | #undef STACK_BOUNDARY | |
41 | #define STACK_BOUNDARY 128 | |
42 | ||
602ea4d3 JJ |
43 | #undef TARGET_IEEEQUAD |
44 | #define TARGET_IEEEQUAD 0 | |
774b5662 | 45 | |
84c041a1 ZW |
46 | /* The AIX linker will discard static constructors in object files before |
47 | collect has a chance to see them, so scan the object files directly. */ | |
48 | #define COLLECT_EXPORT_LIST | |
9ebbca7d | 49 | |
636cf8b1 | 50 | #if HAVE_AS_REF |
7e49a4b3 OH |
51 | /* Issue assembly directives that create a reference to the given DWARF table |
52 | identifier label from the current function section. This is defined to | |
53 | ensure we drag frame frame tables associated with needed function bodies in | |
54 | a link with garbage collection activated. */ | |
55 | #define ASM_OUTPUT_DWARF_TABLE_REF rs6000_aix_asm_output_dwarf_table_ref | |
636cf8b1 | 56 | #endif |
7e49a4b3 | 57 | |
9ebbca7d GK |
58 | /* This is the only version of nm that collect2 can work with. */ |
59 | #define REAL_NM_FILE_NAME "/usr/ucb/nm" | |
60 | ||
2bfcf297 | 61 | #define USER_LABEL_PREFIX "" |
6de9cd9a | 62 | |
9ebbca7d GK |
63 | /* Don't turn -B into -L if the argument specifies a relative file name. */ |
64 | #define RELATIVE_PREFIX_NOT_LINKDIR | |
65 | ||
fc51424c RH |
66 | /* Because of the above, we must have gcc search itself to find libgcc.a. */ |
67 | #define LINK_LIBGCC_SPECIAL_1 | |
9ebbca7d | 68 | |
fc51424c | 69 | /* Names to predefine in the preprocessor for this target machine. */ |
bb904c1a DE |
70 | #define TARGET_OS_AIX_CPP_BUILTINS() \ |
71 | do \ | |
72 | { \ | |
73 | builtin_define ("_IBMR2"); \ | |
74 | builtin_define ("_POWER"); \ | |
7a9a6698 DE |
75 | builtin_define ("__powerpc__"); \ |
76 | builtin_define ("__PPC__"); \ | |
77 | builtin_define ("__unix__"); \ | |
bb904c1a DE |
78 | builtin_define ("_AIX"); \ |
79 | builtin_define ("_AIX32"); \ | |
80 | builtin_define ("_AIX41"); \ | |
81 | builtin_define ("_LONG_LONG"); \ | |
82 | if (TARGET_LONG_DOUBLE_128) \ | |
83 | builtin_define ("__LONGDOUBLE128"); \ | |
84 | builtin_assert ("system=unix"); \ | |
85 | builtin_assert ("system=aix"); \ | |
86 | } \ | |
7990b46f | 87 | while (0) |
9ebbca7d | 88 | |
d6121128 AO |
89 | /* Define appropriate architecture macros for preprocessor depending on |
90 | target switches. */ | |
91 | ||
92 | #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\ | |
4c4eb375 | 93 | %{ansi: -D_ANSI_C_SOURCE}" |
2bfcf297 | 94 | |
0eab6840 DE |
95 | #define CC1_SPEC "%(cc1_cpu)" |
96 | ||
f984d8df | 97 | #undef ASM_DEFAULT_SPEC |
2bfcf297 DB |
98 | #define ASM_DEFAULT_SPEC "" |
99 | ||
9ebbca7d GK |
100 | /* Tell the assembler to assume that all undefined names are external. |
101 | ||
102 | Don't do this until the fixed IBM assembler is more generally available. | |
103 | When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL, | |
104 | ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no | |
1bc7c5b6 ZW |
105 | longer be needed. Also, the extern declaration of mcount in |
106 | rs6000_xcoff_file_start will no longer be needed. */ | |
9ebbca7d GK |
107 | |
108 | /* #define ASM_SPEC "-u %(asm_cpu)" */ | |
109 | ||
110 | /* Default location of syscalls.exp under AIX */ | |
7f142d33 | 111 | #define LINK_SYSCALLS_SPEC "-bI:%R/lib/syscalls.exp" |
9ebbca7d GK |
112 | |
113 | /* Default location of libg.exp under AIX */ | |
7f142d33 | 114 | #define LINK_LIBG_SPEC "-bexport:%R/usr/lib/libg.exp" |
9ebbca7d GK |
115 | |
116 | /* Define the options for the binder: Start text at 512, align all segments | |
117 | to 512 bytes, and warn if there is text relocation. | |
118 | ||
a9098fd0 | 119 | The -bhalt:4 option supposedly changes the level at which ld will abort, |
9ebbca7d GK |
120 | but it also suppresses warnings about multiply defined symbols and is |
121 | used by the AIX cc command. So we use it here. | |
122 | ||
123 | -bnodelcsect undoes a poor choice of default relating to multiply-defined | |
124 | csects. See AIX documentation for more information about this. | |
125 | ||
a9098fd0 | 126 | -bM:SRE tells the linker that the output file is Shared REusable. Note |
9ebbca7d GK |
127 | that to actually build a shared library you will also need to specify an |
128 | export list with the -Wl,-bE option. */ | |
129 | ||
130 | #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\ | |
131 | %{static:-bnso %(link_syscalls) } \ | |
132 | %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}" | |
133 | ||
134 | /* Profiled library versions are used by linking with special directories. */ | |
7f142d33 RS |
135 | #define LIB_SPEC "%{pg:-L%R/lib/profiled -L%R/usr/lib/profiled}\ |
136 | %{p:-L%R/lib/profiled -L%R/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc" | |
9ebbca7d | 137 | |
ce75e1dd | 138 | /* Static linking with shared libstdc++ requires libsupc++ as well. */ |
d9d16a19 | 139 | #define LIBSTDCXX_STATIC "supc++" |
ce75e1dd | 140 | |
a3c9585f | 141 | /* This now supports a natural alignment mode. */ |
3b85fe5f JJ |
142 | /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */ |
143 | #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ | |
dd25a747 AM |
144 | ((TARGET_ALIGN_NATURAL == 0 \ |
145 | && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode) \ | |
146 | ? MIN ((COMPUTED), 32) \ | |
147 | : (COMPUTED)) | |
3b85fe5f | 148 | |
2bfcf297 DB |
149 | /* AIX increases natural record alignment to doubleword if the first |
150 | field is an FP double while the FP fields remain word aligned. */ | |
4e9d3943 DE |
151 | #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ |
152 | ((TREE_CODE (STRUCT) == RECORD_TYPE \ | |
153 | || TREE_CODE (STRUCT) == UNION_TYPE \ | |
154 | || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ | |
155 | && TARGET_ALIGN_NATURAL == 0 \ | |
156 | ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \ | |
2bfcf297 DB |
157 | : MAX ((COMPUTED), (SPECIFIED))) |
158 | ||
8d05ebaa DE |
159 | /* The AIX ABI isn't explicit on whether aggregates smaller than a |
160 | word/doubleword should be padded upward or downward. One could | |
161 | reasonably assume that they follow the normal rules for structure | |
162 | layout treating the parameter area as any other block of memory, | |
163 | then map the reg param area to registers, i.e., pad upward, which | |
164 | is the way IBM Compilers for AIX behave. | |
368ebcd6 | 165 | Setting both of the following defines results in this behavior. */ |
8d05ebaa DE |
166 | #define AGGREGATE_PADDING_FIXED 1 |
167 | #define AGGREGATES_PAD_UPWARD_ALWAYS 1 | |
168 | ||
8d05ebaa DE |
169 | /* Specify padding for the last element of a block move between |
170 | registers and memory. FIRST is nonzero if this is the only | |
171 | element. */ | |
172 | #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \ | |
173 | (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE)) | |
174 | ||
9ebbca7d GK |
175 | /* Indicate that jump tables go in the text section. */ |
176 | ||
177 | #define JUMP_TABLES_IN_TEXT_SECTION 1 | |
178 | ||
9ebbca7d GK |
179 | /* Define any extra SPECS that the compiler needs to generate. */ |
180 | #undef SUBTARGET_EXTRA_SPECS | |
181 | #define SUBTARGET_EXTRA_SPECS \ | |
182 | { "link_syscalls", LINK_SYSCALLS_SPEC }, \ | |
183 | { "link_libg", LINK_LIBG_SPEC } | |
184 | ||
411707f4 | 185 | #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL) |
b91da81f | 186 | |
66188a7e GK |
187 | /* No version of AIX fully supports AltiVec or 64-bit instructions in |
188 | 32-bit mode. */ | |
189 | #define OS_MISSING_POWERPC64 1 | |
190 | #define OS_MISSING_ALTIVEC 1 | |
466db3c1 DE |
191 | |
192 | /* WINT_TYPE */ | |
193 | #define WINT_TYPE "int" | |
39acb18f EB |
194 | |
195 | /* Static stack checking is supported by means of probes. */ | |
196 | #define STACK_CHECK_STATIC_BUILTIN 1 |