Benchmark inputs for cos and sin
[glibc.git] / csu / libc-start.c
blobc898d06b0361b2a8326748fe0cf483aeb57f0d44
1 /* Copyright (C) 1998-2013 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
18 #include <assert.h>
19 #include <stdlib.h>
20 #include <stdio.h>
21 #include <unistd.h>
22 #include <ldsodefs.h>
24 extern void __libc_init_first (int argc, char **argv, char **envp);
25 #ifndef SHARED
26 extern void __libc_csu_irel (void);
27 #endif
29 extern int __libc_multiple_libcs;
31 #include <tls.h>
32 #ifndef SHARED
33 # include <dl-osinfo.h>
34 extern void __pthread_initialize_minimal (void);
35 # ifndef THREAD_SET_STACK_GUARD
36 /* Only exported for architectures that don't store the stack guard canary
37 in thread local area. */
38 uintptr_t __stack_chk_guard attribute_relro;
39 # endif
40 # ifndef THREAD_SET_POINTER_GUARD
41 /* Only exported for architectures that don't store the pointer guard
42 value in thread local area. */
43 uintptr_t __pointer_chk_guard_local
44 attribute_relro attribute_hidden __attribute__ ((nocommon));
45 # endif
46 #endif
48 #ifdef HAVE_PTR_NTHREADS
49 /* We need atomic operations. */
50 # include <atomic.h>
51 #endif
54 #ifndef SHARED
55 # include <link.h>
56 # include <dl-irel.h>
58 # ifdef ELF_MACHINE_IRELA
59 # define IREL_T ElfW(Rela)
60 # define IPLT_START __rela_iplt_start
61 # define IPLT_END __rela_iplt_end
62 # define IREL elf_irela
63 # elif defined ELF_MACHINE_IREL
64 # define IREL_T ElfW(Rel)
65 # define IPLT_START __rel_iplt_start
66 # define IPLT_END __rel_iplt_end
67 # define IREL elf_irel
68 # endif
70 static void
71 apply_irel (void)
73 # ifdef IREL
74 /* We use weak references for these so that we'll still work with a linker
75 that doesn't define them. Such a linker doesn't support IFUNC at all
76 and so uses won't work, but a statically-linked program that doesn't
77 use any IFUNC symbols won't have a problem. */
78 extern const IREL_T IPLT_START[] __attribute__ ((weak));
79 extern const IREL_T IPLT_END[] __attribute__ ((weak));
80 for (const IREL_T *ipltent = IPLT_START; ipltent < IPLT_END; ++ipltent)
81 IREL (ipltent);
82 # endif
84 #endif
87 #ifdef LIBC_START_MAIN
88 # ifdef LIBC_START_DISABLE_INLINE
89 # define STATIC static
90 # else
91 # define STATIC static inline __attribute__ ((always_inline))
92 # endif
93 #else
94 # define STATIC
95 # define LIBC_START_MAIN __libc_start_main
96 #endif
98 #ifdef MAIN_AUXVEC_ARG
99 /* main gets passed a pointer to the auxiliary. */
100 # define MAIN_AUXVEC_DECL , void *
101 # define MAIN_AUXVEC_PARAM , auxvec
102 #else
103 # define MAIN_AUXVEC_DECL
104 # define MAIN_AUXVEC_PARAM
105 #endif
107 STATIC int LIBC_START_MAIN (int (*main) (int, char **, char **
108 MAIN_AUXVEC_DECL),
109 int argc,
110 char **argv,
111 #ifdef LIBC_START_MAIN_AUXVEC_ARG
112 ElfW(auxv_t) *auxvec,
113 #endif
114 __typeof (main) init,
115 void (*fini) (void),
116 void (*rtld_fini) (void),
117 void *stack_end)
118 __attribute__ ((noreturn));
121 /* Note: the fini parameter is ignored here for shared library. It
122 is registered with __cxa_atexit. This had the disadvantage that
123 finalizers were called in more than one place. */
124 STATIC int
125 LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
126 int argc, char **argv,
127 #ifdef LIBC_START_MAIN_AUXVEC_ARG
128 ElfW(auxv_t) *auxvec,
129 #endif
130 __typeof (main) init,
131 void (*fini) (void),
132 void (*rtld_fini) (void), void *stack_end)
134 /* Result of the 'main' function. */
135 int result;
137 __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
139 #ifndef SHARED
140 char **ev = &argv[argc + 1];
142 __environ = ev;
144 /* Store the lowest stack address. This is done in ld.so if this is
145 the code for the DSO. */
146 __libc_stack_end = stack_end;
148 # ifdef HAVE_AUX_VECTOR
149 /* First process the auxiliary vector since we need to find the
150 program header to locate an eventually present PT_TLS entry. */
151 # ifndef LIBC_START_MAIN_AUXVEC_ARG
152 ElfW(auxv_t) *auxvec;
154 char **evp = ev;
155 while (*evp++ != NULL)
157 auxvec = (ElfW(auxv_t) *) evp;
159 # endif
160 _dl_aux_init (auxvec);
161 if (GL(dl_phdr) == NULL)
162 # endif
164 /* Starting from binutils-2.23, the linker will define the
165 magic symbol __ehdr_start to point to our own ELF header
166 if it is visible in a segment that also includes the phdrs.
167 So we can set up _dl_phdr and _dl_phnum even without any
168 information from auxv. */
170 extern const ElfW(Ehdr) __ehdr_start
171 __attribute__ ((weak, visibility ("hidden")));
172 if (&__ehdr_start != NULL)
174 assert (__ehdr_start.e_phentsize == sizeof *GL(dl_phdr));
175 GL(dl_phdr) = (const void *) &__ehdr_start + __ehdr_start.e_phoff;
176 GL(dl_phnum) = __ehdr_start.e_phnum;
180 # ifdef DL_SYSDEP_OSCHECK
181 if (!__libc_multiple_libcs)
183 /* This needs to run to initiliaze _dl_osversion before TLS
184 setup might check it. */
185 DL_SYSDEP_OSCHECK (__libc_fatal);
187 # endif
189 /* Perform IREL{,A} relocations. */
190 apply_irel ();
192 /* Initialize the thread library at least a bit since the libgcc
193 functions are using thread functions if these are available and
194 we need to setup errno. */
195 __pthread_initialize_minimal ();
197 /* Set up the stack checker's canary. */
198 uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random);
199 # ifdef THREAD_SET_STACK_GUARD
200 THREAD_SET_STACK_GUARD (stack_chk_guard);
201 # else
202 __stack_chk_guard = stack_chk_guard;
203 # endif
205 /* Set up the pointer guard value. */
206 uintptr_t pointer_chk_guard = _dl_setup_pointer_guard (_dl_random,
207 stack_chk_guard);
208 # ifdef THREAD_SET_POINTER_GUARD
209 THREAD_SET_POINTER_GUARD (pointer_chk_guard);
210 # else
211 __pointer_chk_guard_local = pointer_chk_guard;
212 # endif
214 #endif
216 /* Register the destructor of the dynamic linker if there is any. */
217 if (__builtin_expect (rtld_fini != NULL, 1))
218 __cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);
220 #ifndef SHARED
221 /* Call the initializer of the libc. This is only needed here if we
222 are compiling for the static library in which case we haven't
223 run the constructors in `_dl_start_user'. */
224 __libc_init_first (argc, argv, __environ);
226 /* Register the destructor of the program, if any. */
227 if (fini)
228 __cxa_atexit ((void (*) (void *)) fini, NULL, NULL);
230 /* Some security at this point. Prevent starting a SUID binary where
231 the standard file descriptors are not opened. We have to do this
232 only for statically linked applications since otherwise the dynamic
233 loader did the work already. */
234 if (__builtin_expect (__libc_enable_secure, 0))
235 __libc_check_standard_fds ();
236 #endif
238 /* Call the initializer of the program, if any. */
239 #ifdef SHARED
240 if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
241 GLRO(dl_debug_printf) ("\ninitialize program: %s\n\n", argv[0]);
242 #endif
243 if (init)
244 (*init) (argc, argv, __environ MAIN_AUXVEC_PARAM);
246 #ifdef SHARED
247 /* Auditing checkpoint: we have a new object. */
248 if (__builtin_expect (GLRO(dl_naudit) > 0, 0))
250 struct audit_ifaces *afct = GLRO(dl_audit);
251 struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
252 for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
254 if (afct->preinit != NULL)
255 afct->preinit (&head->l_audit[cnt].cookie);
257 afct = afct->next;
260 #endif
262 #ifdef SHARED
263 if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
264 GLRO(dl_debug_printf) ("\ntransferring control: %s\n\n", argv[0]);
265 #endif
267 #ifdef HAVE_CLEANUP_JMP_BUF
268 /* Memory for the cancellation buffer. */
269 struct pthread_unwind_buf unwind_buf;
271 int not_first_call;
272 not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf);
273 if (__builtin_expect (! not_first_call, 1))
275 struct pthread *self = THREAD_SELF;
277 /* Store old info. */
278 unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
279 unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup);
281 /* Store the new cleanup handler info. */
282 THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf);
284 /* Run the program. */
285 result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
287 else
289 /* Remove the thread-local data. */
290 # ifdef SHARED
291 PTHFCT_CALL (ptr__nptl_deallocate_tsd, ());
292 # else
293 extern void __nptl_deallocate_tsd (void) __attribute ((weak));
294 __nptl_deallocate_tsd ();
295 # endif
297 /* One less thread. Decrement the counter. If it is zero we
298 terminate the entire process. */
299 result = 0;
300 # ifdef SHARED
301 unsigned int *ptr = __libc_pthread_functions.ptr_nthreads;
302 # ifdef PTR_DEMANGLE
303 PTR_DEMANGLE (ptr);
304 # endif
305 # else
306 extern unsigned int __nptl_nthreads __attribute ((weak));
307 unsigned int *const ptr = &__nptl_nthreads;
308 # endif
310 if (! atomic_decrement_and_test (ptr))
311 /* Not much left to do but to exit the thread, not the process. */
312 __exit_thread (0);
314 #else
315 /* Nothing fancy, just call the function. */
316 result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
317 #endif
319 exit (result);