1 /* Definitions for 64-bit PowerPC running FreeBSD using the ELF format
2 Copyright (C) 2012-2023 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published
8 by the Free Software Foundation; either version 3, or (at your
9 option) any later version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 /* Undef gnu-user.h macros we don't want. */
21 #undef CPLUSPLUS_CPP_SPEC
22 #undef LINK_GCC_C_SEQUENCE_SPEC
23
24 /* Override the defaults, which exist to force the proper definition. */
25
26 #ifdef IN_LIBGCC2
27 #undef TARGET_64BIT
28 #ifdef __powerpc64__
29 #define TARGET_64BIT 1
30 #else
31 #define TARGET_64BIT 0
32 #endif
33 #endif
34
35 #undef TARGET_AIX
36 #define TARGET_AIX TARGET_64BIT
37
38 #ifdef HAVE_LD_NO_DOT_SYMS
39 /* New ABI uses a local sym for the function entry point. */
40 extern int dot_symbols;
41 #undef DOT_SYMBOLS
42 #define DOT_SYMBOLS dot_symbols
43 #endif
44
45 #define TARGET_USES_LINUX64_OPT 1
46 #ifdef HAVE_LD_LARGE_TOC
47 #undef TARGET_CMODEL
48 #define TARGET_CMODEL rs6000_current_cmodel
49 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
50 #else
51 #define SET_CMODEL(opt) do {} while (0)
52 #endif
53
54 #undef PROCESSOR_DEFAULT
55 #define PROCESSOR_DEFAULT PROCESSOR_PPC7450
56 #undef PROCESSOR_DEFAULT64
57 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER8
58
59 /* We don't need to generate entries in .fixup, except when
60 -mrelocatable or -mrelocatable-lib is given. */
61 #undef RELOCATABLE_NEEDS_FIXUP
62 #define RELOCATABLE_NEEDS_FIXUP \
63 (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
64
65 #undef RS6000_ABI_NAME
66 #define RS6000_ABI_NAME "freebsd"
67
68 #define INVALID_64BIT "-m%s not supported in this configuration"
69 #define INVALID_32BIT INVALID_64BIT
70
71 /* Use LINUX64 instead of FREEBSD64 for compat with e.g. sysv4le.h */
72 #ifdef LINUX64_DEFAULT_ABI_ELFv2
73 #define ELFv2_ABI_CHECK (rs6000_elf_abi != 1)
74 #else
75 #define ELFv2_ABI_CHECK (rs6000_elf_abi == 2)
76 #endif
77
78 #undef SUBSUBTARGET_OVERRIDE_OPTIONS
79 #define SUBSUBTARGET_OVERRIDE_OPTIONS \
80 do rs6000_linux64_override_options (); while (0)
81
82 #undef ASM_SPEC
83 #undef LINK_OS_FREEBSD_SPEC
84
85 #define ASM_SPEC "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
86 #define LINK_OS_FREEBSD_SPEC "%{m32:%(link_os_freebsd_spec32)}%{!m32:%(link_os_freebsd_spec64)}"
87
88 #define ASM_SPEC32 "-a32 \
89 %{mrelocatable} %{mrelocatable-lib} %{" FPIE_OR_FPIC_SPEC ":-K PIC} \
90 %{memb} %{!memb: %{msdata=eabi: -memb}} \
91 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
92 %{mcall-freebsd: -mbig} \
93 %{mcall-i960-old: -mlittle} \
94 %{mcall-linux: -mbig} \
95 %{mcall-gnu: -mbig} \
96 %{mcall-netbsd: -mbig} \
97 }}}}"
98
99 #define ASM_SPEC64 "-a64"
100
101 #define ASM_SPEC_COMMON "%(asm_cpu) \
102 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
103 ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
104
105 #undef SUBSUBTARGET_EXTRA_SPECS
106 #define SUBSUBTARGET_EXTRA_SPECS \
107 { "asm_spec_common", ASM_SPEC_COMMON }, \
108 { "asm_spec32", ASM_SPEC32 }, \
109 { "asm_spec64", ASM_SPEC64 }, \
110 { "link_os_freebsd_spec32", LINK_OS_FREEBSD_SPEC32 }, \
111 { "link_os_freebsd_spec64", LINK_OS_FREEBSD_SPEC64 },
112
113 #define LINK_OS_FREEBSD_SPEC_DEF "\
114 %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
115 %{v:-V} \
116 %{assert*} %{R*} %{rpath*} %{defsym*} \
117 %{shared:-Bshareable %{h*} %{soname*}} \
118 %{!shared: \
119 %{!static: \
120 %{rdynamic: -export-dynamic} \
121 %{!dynamic-linker:-dynamic-linker " FBSD_DYNAMIC_LINKER "}} \
122 %{static:-Bstatic}} \
123 %{symbolic:-Bsymbolic}"
124
125 #undef DEFAULT_ASM_ENDIAN
126 #define LINK_OS_FREEBSD_SPEC32 "-melf32ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
127 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
128 #define DEFAULT_ASM_ENDIAN " -mlittle"
129 #define LINK_OS_FREEBSD_SPEC64 "-melf64lppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
130 #else
131 #define DEFAULT_ASM_ENDIAN " -mbig"
132 #define LINK_OS_FREEBSD_SPEC64 "-melf64ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
133 #endif
134
135 #undef MULTILIB_DEFAULTS
136 #define MULTILIB_DEFAULTS { "m64" }
137
138 /* PowerPC-64 FreeBSD increases natural record alignment to doubleword if
139 the first field is an FP double, only if in power alignment mode. */
140 #undef ROUND_TYPE_ALIGN
141 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
142 ((TARGET_64BIT \
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 /* Use the default for compiling target libs. */
151 #ifdef IN_TARGET_LIBS
152 #undef TARGET_ALIGN_NATURAL
153 #define TARGET_ALIGN_NATURAL 1
154 #endif
155
156 /* Indicate that jump tables go in the text section. */
157 #undef JUMP_TABLES_IN_TEXT_SECTION
158 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
159
160 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
161 than a doubleword should be padded upward or downward. You could
162 reasonably assume that they follow the normal rules for structure
163 layout treating the parameter area as any other block of memory,
164 then map the reg param area to registers. i.e. pad upward.
165 Setting both of the following defines results in this behavior.
166 Setting just the first one will result in aggregates that fit in a
167 doubleword being padded downward, and others being padded upward.
168 Not a bad idea as this results in struct { int x; } being passed
169 the same way as an int. */
170 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
171 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
172
173 /* Specify padding for the last element of a block move between
174 registers and memory. FIRST is nonzero if this is the only
175 element. */
176 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
177 (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
178
179 /* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit
180 kernel. This is supported when running on a 64-bit kernel with
181 COMPAT_FREEBSD32, but tell GCC it isn't so that our 32-bit binaries
182 are compatible. */
183 #define OS_MISSING_POWERPC64 !TARGET_64BIT
184
185 #undef FBSD_TARGET_CPU_CPP_BUILTINS
186 #define FBSD_TARGET_CPU_CPP_BUILTINS() \
187 do \
188 { \
189 builtin_define ("__PPC__"); \
190 builtin_define ("__ppc__"); \
191 builtin_define ("__powerpc__"); \
192 if (TARGET_64BIT) \
193 { \
194 builtin_define ("__arch64__"); \
195 builtin_define ("__LP64__"); \
196 builtin_define ("__PPC64__"); \
197 builtin_define ("__powerpc64__"); \
198 builtin_assert ("cpu=powerpc64"); \
199 builtin_assert ("machine=powerpc64"); \
200 } \
201 else \
202 { \
203 builtin_define_std ("PPC"); \
204 builtin_define_std ("powerpc"); \
205 builtin_assert ("cpu=powerpc"); \
206 builtin_assert ("machine=powerpc"); \
207 TARGET_OS_SYSV_CPP_BUILTINS (); \
208 } \
209 } \
210 while (0)
211
212 #undef CPP_OS_DEFAULT_SPEC
213 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_freebsd)"
214
215 #undef CPP_OS_FREEBSD_SPEC
216 #define CPP_OS_FREEBSD_SPEC ""
217
218 #undef STARTFILE_DEFAULT_SPEC
219 #define STARTFILE_DEFAULT_SPEC "%(startfile_freebsd)"
220
221 #undef ENDFILE_DEFAULT_SPEC
222 #define ENDFILE_DEFAULT_SPEC "%(endfile_freebsd)"
223
224 #undef LIB_DEFAULT_SPEC
225 #define LIB_DEFAULT_SPEC "%(lib_freebsd)"
226
227 #undef LINK_START_DEFAULT_SPEC
228 #define LINK_START_DEFAULT_SPEC "%(link_start_freebsd)"
229
230 #undef LINK_OS_DEFAULT_SPEC
231 #define LINK_OS_DEFAULT_SPEC "%(link_os_freebsd)"
232
233 /* XXX: This is wrong for many platforms in sysv4.h.
234 We should work on getting that definition fixed. */
235 #undef LINK_SHLIB_SPEC
236 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
237
238
239 /************************[ Target stuff ]***********************************/
240
241 /* Define the actual types of some ANSI-mandated types.
242 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.cc,
243 c-common.cc, and config/<arch>/<arch>.h. */
244
245
246 #undef SIZE_TYPE
247 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
248
249 #undef PTRDIFF_TYPE
250 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
251
252 /* rs6000.h gets this wrong for FreeBSD. We use the GCC defaults instead. */
253 #undef WCHAR_TYPE
254
255 #undef WCHAR_TYPE_SIZE
256 #define WCHAR_TYPE_SIZE 32
257
258 /* Function profiling bits */
259 #undef RS6000_MCOUNT
260 #define RS6000_MCOUNT "_mcount"
261
262 #define PROFILE_HOOK(LABEL) \
263 do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
264
265 /* _init and _fini functions are built from bits spread across many
266 object files, each potentially with a different TOC pointer. For
267 that reason, place a nop after the call so that the linker can
268 restore the TOC pointer if a TOC adjusting call stub is needed. */
269 #ifdef __powerpc64__
270 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
271 asm (SECTION_OP "\n" \
272 " bl " #FUNC "\n" \
273 " nop\n" \
274 " .previous");
275 #endif
276
277 /* FP save and restore routines. */
278 #undef SAVE_FP_PREFIX
279 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
280 #undef SAVE_FP_SUFFIX
281 #define SAVE_FP_SUFFIX ""
282 #undef RESTORE_FP_PREFIX
283 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
284 #undef RESTORE_FP_SUFFIX
285 #define RESTORE_FP_SUFFIX ""
286
287 /* Select a format to encode pointers in exception handling data. CODE
288 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
289 true if the symbol may be affected by dynamic relocations. */
290 #undef ASM_PREFERRED_EH_DATA_FORMAT
291 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
292 (TARGET_64BIT || flag_pic \
293 ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel \
294 | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4)) \
295 : DW_EH_PE_absptr)
296
297 /* Static stack checking is supported by means of probes. */
298 #define STACK_CHECK_STATIC_BUILTIN 1
299
300 /* The default value isn't sufficient in 64-bit mode. */
301 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
302
303 /* Use standard DWARF numbering for DWARF debugging information. */
304 #define RS6000_USE_DWARF_NUMBERING
305
306 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given. */
307 #undef ADJUST_FIELD_ALIGN
308 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
309 ((TARGET_64BIT \
310 && TARGET_ALIGN_NATURAL == 0 \
311 && TYPE_MODE (strip_array_types (TYPE)) == DFmode) \
312 ? MIN ((COMPUTED), 32) \
313 : (COMPUTED))
314
315 #undef TOC_SECTION_ASM_OP
316 #define TOC_SECTION_ASM_OP \
317 (TARGET_64BIT \
318 ? "\t.section\t\".toc\",\"aw\"" \
319 : "\t.section\t\".got\",\"aw\"")
320
321 #undef MINIMAL_TOC_SECTION_ASM_OP
322 #define MINIMAL_TOC_SECTION_ASM_OP \
323 (TARGET_64BIT \
324 ? "\t.section\t\".toc1\",\"aw\"" \
325 : (flag_pic \
326 ? "\t.section\t\".got2\",\"aw\"" \
327 : "\t.section\t\".got1\",\"aw\""))
328
329 /* This is how to declare the size of a function. */
330 #undef ASM_DECLARE_FUNCTION_SIZE
331 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
332 do \
333 { \
334 if (!flag_inhibit_size_directive) \
335 { \
336 fputs ("\t.size\t", (FILE)); \
337 if (TARGET_64BIT && DOT_SYMBOLS) \
338 putc ('.', (FILE)); \
339 assemble_name ((FILE), (FNAME)); \
340 fputs (",.-", (FILE)); \
341 rs6000_output_function_entry (FILE, FNAME); \
342 putc ('\n', (FILE)); \
343 } \
344 } \
345 while (0)
346
347 #undef ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
348 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) \
349 (TARGET_TOC \
350 && (SYMBOL_REF_P (X) \
351 || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS \
352 && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0))) \
353 || GET_CODE (X) == LABEL_REF \
354 || (CONST_INT_P (X) \
355 && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode)) \
356 || (CONST_DOUBLE_P (X) \
357 && ((TARGET_64BIT \
358 && (TARGET_MINIMAL_TOC \
359 || (SCALAR_FLOAT_MODE_P (GET_MODE (X)) \
360 && ! TARGET_NO_FP_IN_TOC))) \
361 || (!TARGET_64BIT \
362 && !TARGET_NO_FP_IN_TOC \
363 && SCALAR_FLOAT_MODE_P (GET_MODE (X)) \
364 && BITS_PER_WORD == HOST_BITS_PER_INT)))))
365
366 /* Use --as-needed -lgcc_s for eh support. */
367 #ifdef HAVE_LD_AS_NEEDED
368 #define USE_LD_AS_NEEDED 1
369 #endif
370
371 #define POWERPC_FREEBSD