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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* Base configuration file for all OpenBSD targets.
2 Copyright (C) 1999, 2000, 2004, 2005, 2007 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 { STANDARD_INCLUDE_DIR, STANDARD_INCLUDE_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 /* CPP_SPEC appropriate for OpenBSD. We deal with -posix and -pthread.
88 XXX the way threads are handled currently is not very satisfying,
89 since all code must be compiled with -pthread to work.
90 This two-stage defines makes it easy to pick that for targets that
91 have subspecs. */
92 #ifdef CPP_CPU_SPEC
93 #define OBSD_CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}"
94 #else
95 #define OBSD_CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}"
96 #endif
97
98 /* LIB_SPEC appropriate for OpenBSD. */
99 #ifdef HAS_LIBC_R
100 /* -lc(_r)?(_p)?, select _r for threads, and _p for p or pg. */
101 # define OBSD_LIB_SPEC "%{!shared:-lc%{pthread:_r}%{p:_p}%{!p:%{pg:_p}}}"
102 #else
103 /* Include -lpthread if -pthread is specified on the command line. */
104 # define OBSD_LIB_SPEC "%{!shared:%{pthread:-lpthread%{p:_p}%{!p:%{pg:_p}}}} %{!shared:-lc%{p:_p}%{!p:%{pg:_p}}}"
105 #endif
106
107
108 #ifndef OBSD_HAS_CORRECT_SPECS
109
110 #ifndef OBSD_NO_DYNAMIC_LIBRARIES
111 #undef SWITCH_TAKES_ARG
112 #define SWITCH_TAKES_ARG(CHAR) \
113 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \
114 || (CHAR) == 'R')
115 #endif
116
117 #undef CPP_SPEC
118 #define CPP_SPEC OBSD_CPP_SPEC
119
120 #ifdef OBSD_OLD_GAS
121 /* ASM_SPEC appropriate for OpenBSD. For some architectures, OpenBSD
122 still uses a special flavor of gas that needs to be told when generating
123 pic code. */
124 #undef ASM_SPEC
125 #define ASM_SPEC "%{fpic|fpie:-k} %{fPIC|fPIE:-k -K}"
126 #endif
127
128 /* Since we use gas, stdin -> - is a good idea. */
129 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
130
131 /* LINK_SPEC appropriate for OpenBSD. Support for GCC options
132 -static, -assert, and -nostdlib. */
133 #undef LINK_SPEC
134 #ifdef OBSD_NO_DYNAMIC_LIBRARIES
135 #define LINK_SPEC \
136 "%{g:%{!nostdlib:-L/usr/lib/debug}} %{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{assert*}"
137 #else
138 #define LINK_SPEC \
139 "%{g:%{!nostdlib:-L/usr/lib/debug}} %{!shared:%{!nostdlib:%{!r*:%{!e*:-e start}}}} %{shared:-Bshareable -x} -dc -dp %{R*} %{static:-Bstatic} %{assert*}"
140 #endif
141
142 #undef LIB_SPEC
143 #define LIB_SPEC OBSD_LIB_SPEC
144 #endif
145
146
147 /* Runtime target specification. */
148
149 /* Miscellaneous parameters. */
150
151 /* Controlling debugging info: dbx options. */
152
153 /* Don't use the `xsTAG;' construct in DBX output; OpenBSD systems that
154 use DBX don't support it. */
155 #define DBX_NO_XREFS
156
157
158 /* Support of shared libraries, mostly imported from svr4.h through netbsd. */
159 /* Two differences from svr4.h:
160 - we use . - _func instead of a local label,
161 - we put extra spaces in expressions such as
162 .type _func , @function
163 This is more readable for a human being and confuses c++filt less. */
164
165 /* Assembler format: output and generation of labels. */
166
167 /* Define the strings used for the .type and .size directives.
168 These strings generally do not vary from one system running OpenBSD
169 to another, but if a given system needs to use different pseudo-op
170 names for these, they may be overridden in the arch specific file. */
171
172 /* OpenBSD assembler is hacked to have .type & .size support even in a.out
173 format object files. Functions size are supported but not activated
174 yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c).
175 SET_ASM_OP is needed for attribute alias to work. */
176
177 #undef TYPE_ASM_OP
178 #undef SIZE_ASM_OP
179 #undef SET_ASM_OP
180 #undef GLOBAL_ASM_OP
181
182 #define TYPE_ASM_OP "\t.type\t"
183 #define SIZE_ASM_OP "\t.size\t"
184 #define SET_ASM_OP "\t.set\t"
185 #define GLOBAL_ASM_OP "\t.globl\t"
186
187 /* The following macro defines the format used to output the second
188 operand of the .type assembler directive. */
189 #undef TYPE_OPERAND_FMT
190 #define TYPE_OPERAND_FMT "@%s"
191
192 /* Provision if extra assembler code is needed to declare a function's result
193 (taken from svr4, not needed yet actually). */
194 #ifndef ASM_DECLARE_RESULT
195 #define ASM_DECLARE_RESULT(FILE, RESULT)
196 #endif
197
198 /* These macros generate the special .type and .size directives which
199 are used to set the corresponding fields of the linker symbol table
200 entries under OpenBSD. These macros also have to output the starting
201 labels for the relevant functions/objects. */
202
203 #ifndef OBSD_HAS_DECLARE_FUNCTION_NAME
204 /* Extra assembler code needed to declare a function properly.
205 Some assemblers may also need to also have something extra said
206 about the function's return value. We allow for that here. */
207 #undef ASM_DECLARE_FUNCTION_NAME
208 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
209 do { \
210 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \
211 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
212 ASM_OUTPUT_LABEL(FILE, NAME); \
213 } while (0)
214 #endif
215
216 #ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE
217 /* Declare the size of a function. */
218 #undef ASM_DECLARE_FUNCTION_SIZE
219 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
220 do { \
221 if (!flag_inhibit_size_directive) \
222 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \
223 } while (0)
224 #endif
225
226 #ifndef OBSD_HAS_DECLARE_OBJECT
227 /* Extra assembler code needed to declare an object properly. */
228 #undef ASM_DECLARE_OBJECT_NAME
229 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
230 do { \
231 HOST_WIDE_INT size; \
232 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
233 size_directive_output = 0; \
234 if (!flag_inhibit_size_directive \
235 && (DECL) && DECL_SIZE (DECL)) \
236 { \
237 size_directive_output = 1; \
238 size = int_size_in_bytes (TREE_TYPE (DECL)); \
239 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
240 } \
241 ASM_OUTPUT_LABEL (FILE, NAME); \
242 } while (0)
243
244 /* Output the size directive for a decl in rest_of_decl_compilation
245 in the case where we did not do so before the initializer.
246 Once we find the error_mark_node, we know that the value of
247 size_directive_output was set by ASM_DECLARE_OBJECT_NAME
248 when it was run for the same decl. */
249 #undef ASM_FINISH_DECLARE_OBJECT
250 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
251 do { \
252 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
253 HOST_WIDE_INT size; \
254 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
255 && ! AT_END && TOP_LEVEL \
256 && DECL_INITIAL (DECL) == error_mark_node \
257 && !size_directive_output) \
258 { \
259 size_directive_output = 1; \
260 size = int_size_in_bytes (TREE_TYPE (DECL)); \
261 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
262 } \
263 } while (0)
264 #endif
265
266
267 /* Those are `generic' ways to weaken/globalize a label. We shouldn't need
268 to override a processor specific definition. Hence, #ifndef ASM_*
269 In case overriding turns out to be needed, one can always #undef ASM_*
270 before including this file. */
271
272 /* Tell the assembler that a symbol is weak. */
273 /* Note: netbsd arm32 assembler needs a .globl here. An override may
274 be needed when/if we go for arm32 support. */
275 #ifndef ASM_WEAKEN_LABEL
276 #define ASM_WEAKEN_LABEL(FILE,NAME) \
277 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
278 fputc ('\n', FILE); } while (0)
279 #endif
280
281 /* Storage layout. */
282
283
284 /* Otherwise, since we support weak, gthr.h erroneously tries to use
285 #pragma weak. */
286 #define GTHREAD_USE_WEAK 0
287
288 /* bug work around: we don't want to support #pragma weak, but the current
289 code layout needs HANDLE_PRAGMA_WEAK asserted for __attribute((weak)) to
290 work. On the other hand, we don't define HANDLE_PRAGMA_WEAK directly,
291 as this depends on a few other details as well... */
292 #define HANDLE_SYSV_PRAGMA 1
293
294 /* Stack is explicitly denied execution rights on OpenBSD platforms. */
295 #define ENABLE_EXECUTE_STACK \
296 extern void __enable_execute_stack (void *); \
297 void \
298 __enable_execute_stack (void *addr) \
299 { \
300 long size = getpagesize (); \
301 long mask = ~(size-1); \
302 char *page = (char *) (((long) addr) & mask); \
303 char *end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
304 \
305 if (mprotect (page, end - page, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) \
306 perror ("mprotect of trampoline code"); \
307 }
308
309 #include <sys/types.h>
310 #include <sys/mman.h>