1 /* Base configuration file for all OpenBSD targets.
2 Copyright (C) 1999-2023 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
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public 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 /* Common OpenBSD configuration.
21 All OpenBSD architectures include this file, which is intended as
22 a repository for common defines.
23
24 Some defines are common to all architectures, a few of them are
25 triggered by OBSD_* guards, so that we won't override architecture
26 defaults by mistakes.
27
28 OBSD_HAS_CORRECT_SPECS:
29 another mechanism provides correct specs already.
30 OBSD_NO_DYNAMIC_LIBRARIES:
31 no implementation of dynamic libraries.
32 OBSD_OLD_GAS:
33 older flavor of gas which needs help for PIC.
34 OBSD_HAS_DECLARE_FUNCTION_NAME, OBSD_HAS_DECLARE_FUNCTION_SIZE,
35 OBSD_HAS_DECLARE_OBJECT:
36 PIC support, FUNCTION_NAME/FUNCTION_SIZE are independent, whereas
37 the corresponding logic for OBJECTS is necessarily coupled.
38
39 There are also a few `default' defines such as ASM_WEAKEN_LABEL,
40 intended as common ground for arch that don't provide
41 anything suitable. */
42
43 /* OPENBSD_NATIVE is defined only when gcc is configured as part of
44 the OpenBSD source tree, specifically through Makefile.bsd-wrapper.
45
46 In such a case the include path can be trimmed as there is no
47 distinction between system includes and gcc includes. */
48
49 /* This configuration method, namely Makefile.bsd-wrapper and
50 OPENBSD_NATIVE is NOT recommended for building cross-compilers. */
51
52 #ifdef OPENBSD_NATIVE
53
54 /* The compiler is configured with ONLY the gcc/g++ standard headers. */
55 #undef INCLUDE_DEFAULTS
56 #define INCLUDE_DEFAULTS \
57 { \
58 { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 }, \
59 { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1 }, \
60 { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1 }, \
61 { NATIVE_SYSTEM_HEADER_DIR, NATIVE_SYSTEM_HEADER_COMPONENT, 0, 0 }, \
62 { 0, 0, 0, 0 } \
63 }
64
65 /* Under OpenBSD, the normal location of the various *crt*.o files is the
66 /usr/lib directory. */
67 #undef STANDARD_STARTFILE_PREFIX
68 #define STANDARD_STARTFILE_PREFIX "/usr/local/lib/"
69
70 #endif
71
72
73 /* Controlling the compilation driver. */
74 /* TARGET_OS_CPP_BUILTINS() common to all OpenBSD targets. */
75 #define OPENBSD_OS_CPP_BUILTINS() \
76 do \
77 { \
78 builtin_define ("__OpenBSD__"); \
79 builtin_define ("__unix__"); \
80 builtin_define ("__ANSI_COMPAT"); \
81 builtin_assert ("system=unix"); \
82 builtin_assert ("system=bsd"); \
83 builtin_assert ("system=OpenBSD"); \
84 } \
85 while (0)
86
87 /* TARGET_OS_CPP_BUILTINS() common to all OpenBSD ELF targets. */
88 #define OPENBSD_OS_CPP_BUILTINS_ELF() \
89 do \
90 { \
91 OPENBSD_OS_CPP_BUILTINS(); \
92 builtin_define ("__ELF__"); \
93 } \
94 while (0)
95
96 /* TARGET_OS_CPP_BUILTINS() common to all LP64 OpenBSD targets. */
97 #define OPENBSD_OS_CPP_BUILTINS_LP64() \
98 do \
99 { \
100 builtin_define ("_LP64"); \
101 builtin_define ("__LP64__"); \
102 } \
103 while (0)
104
105 /* CPP_SPEC appropriate for OpenBSD. We deal with -posix and -pthread.
106 XXX the way threads are handled currently is not very satisfying,
107 since all code must be compiled with -pthread to work.
108 This two-stage defines makes it easy to pick that for targets that
109 have subspecs. */
110 #ifdef CPP_CPU_SPEC
111 #define OBSD_CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}"
112 #else
113 #define OBSD_CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}"
114 #endif
115
116 #undef LIB_SPEC
117 #define LIB_SPEC OBSD_LIB_SPEC
118
119 #ifndef OBSD_HAS_CORRECT_SPECS
120
121 #undef CPP_SPEC
122 #define CPP_SPEC OBSD_CPP_SPEC
123
124 #ifdef OBSD_OLD_GAS
125 /* ASM_SPEC appropriate for OpenBSD. For some architectures, OpenBSD
126 still uses a special flavor of gas that needs to be told when generating
127 pic code. */
128 #undef ASM_SPEC
129 #define ASM_SPEC "%{" FPIE1_OR_FPIC1_SPEC ":-k} %{" FPIE2_OR_FPIC2_SPEC ":-k -K}"
130 #endif
131
132 /* Since we use gas, stdin -> - is a good idea. */
133 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
134
135 #undef LIB_SPEC
136 #define LIB_SPEC OBSD_LIB_SPEC
137
138 #if defined(HAVE_LD_EH_FRAME_HDR)
139 #define LINK_EH_SPEC "%{!static|static-pie:--eh-frame-hdr} "
140 #endif
141
142 #undef LIB_SPEC
143 #define LIB_SPEC OBSD_LIB_SPEC
144 #endif
145
146 #define TARGET_POSIX_IO
147
148 /* All new versions of OpenBSD have C99 functions. We redefine this hook
149 so the version from elfos.h header won't be used. */
150 #undef TARGET_LIBC_HAS_FUNCTION
151 #define TARGET_LIBC_HAS_FUNCTION default_libc_has_function
152
153
154 /* - we use . - _func instead of a local label,
155 - we put extra spaces in expressions such as
156 .type _func , @function
157 This is more readable for a human being and confuses c++filt less. */
158
159 /* Assembler format: output and generation of labels. */
160
161 /* Define the strings used for the .type and .size directives.
162 These strings generally do not vary from one system running OpenBSD
163 to another, but if a given system needs to use different pseudo-op
164 names for these, they may be overridden in the arch specific file. */
165
166 /* OpenBSD assembler is hacked to have .type & .size support even in a.out
167 format object files. Functions size are supported but not activated
168 yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c).
169 SET_ASM_OP is needed for attribute alias to work. */
170
171 #undef TYPE_ASM_OP
172 #undef SIZE_ASM_OP
173 #undef SET_ASM_OP
174 #undef GLOBAL_ASM_OP
175
176 #define TYPE_ASM_OP "\t.type\t"
177 #define SIZE_ASM_OP "\t.size\t"
178 #define SET_ASM_OP "\t.set\t"
179 #define GLOBAL_ASM_OP "\t.globl\t"
180
181 /* The following macro defines the format used to output the second
182 operand of the .type assembler directive. */
183 #undef TYPE_OPERAND_FMT
184 #define TYPE_OPERAND_FMT "@%s"
185
186 /* Provision if extra assembler code is needed to declare a function's result
187 (taken from svr4, not needed yet actually). */
188 #ifndef ASM_DECLARE_RESULT
189 #define ASM_DECLARE_RESULT(FILE, RESULT)
190 #endif
191
192 /* These macros generate the special .type and .size directives which
193 are used to set the corresponding fields of the linker symbol table
194 entries under OpenBSD. These macros also have to output the starting
195 labels for the relevant functions/objects. */
196
197 #ifndef OBSD_HAS_DECLARE_FUNCTION_NAME
198 /* Extra assembler code needed to declare a function properly.
199 Some assemblers may also need to also have something extra said
200 about the function's return value. We allow for that here. */
201 #undef ASM_DECLARE_FUNCTION_NAME
202 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
203 do { \
204 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \
205 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
206 ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL); \
207 } while (0)
208 #endif
209
210 #ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE
211 /* Declare the size of a function. */
212 #undef ASM_DECLARE_FUNCTION_SIZE
213 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
214 do { \
215 if (!flag_inhibit_size_directive) \
216 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \
217 } while (0)
218 #endif
219
220 #ifndef OBSD_HAS_DECLARE_OBJECT
221 /* Extra assembler code needed to declare an object properly. */
222 #undef ASM_DECLARE_OBJECT_NAME
223 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
224 do { \
225 HOST_WIDE_INT size; \
226 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
227 size_directive_output = 0; \
228 if (!flag_inhibit_size_directive \
229 && (DECL) && DECL_SIZE (DECL)) \
230 { \
231 size_directive_output = 1; \
232 size = int_size_in_bytes (TREE_TYPE (DECL)); \
233 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
234 } \
235 ASM_OUTPUT_LABEL (FILE, NAME); \
236 } while (0)
237
238 /* Output the size directive for a decl in rest_of_decl_compilation
239 in the case where we did not do so before the initializer.
240 Once we find the error_mark_node, we know that the value of
241 size_directive_output was set by ASM_DECLARE_OBJECT_NAME
242 when it was run for the same decl. */
243 #undef ASM_FINISH_DECLARE_OBJECT
244 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
245 do { \
246 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
247 HOST_WIDE_INT size; \
248 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
249 && ! AT_END && TOP_LEVEL \
250 && DECL_INITIAL (DECL) == error_mark_node \
251 && !size_directive_output) \
252 { \
253 size_directive_output = 1; \
254 size = int_size_in_bytes (TREE_TYPE (DECL)); \
255 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
256 } \
257 } while (0)
258 #endif
259
260
261 /* Those are `generic' ways to weaken/globalize a label. We shouldn't need
262 to override a processor specific definition. Hence, #ifndef ASM_*
263 In case overriding turns out to be needed, one can always #undef ASM_*
264 before including this file. */
265
266 /* Tell the assembler that a symbol is weak. */
267 /* Note: netbsd arm32 assembler needs a .globl here. An override may
268 be needed when/if we go for arm32 support. */
269 #ifndef ASM_WEAKEN_LABEL
270 #define ASM_WEAKEN_LABEL(FILE,NAME) \
271 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
272 fputc ('\n', FILE); } while (0)
273 #endif
274
275 /* Storage layout. */
276
277
278 #define HAVE_ENABLE_EXECUTE_STACK