diff options
Diffstat (limited to 'csu/libc-start.c')
| -rw-r--r-- | csu/libc-start.c | 336 |
1 files changed, 0 insertions, 336 deletions
diff --git a/csu/libc-start.c b/csu/libc-start.c deleted file mode 100644 index c2dd1593eb..0000000000 --- a/csu/libc-start.c +++ /dev/null @@ -1,336 +0,0 @@ -/* Copyright (C) 1998-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <assert.h> -#include <stdlib.h> -#include <stdio.h> -#include <unistd.h> -#include <ldsodefs.h> -#include <exit-thread.h> -#include <libc-internal.h> - -#include <elf/dl-tunables.h> - -extern void __libc_init_first (int argc, char **argv, char **envp); - -extern int __libc_multiple_libcs; - -#include <tls.h> -#ifndef SHARED -# include <dl-osinfo.h> -# ifndef THREAD_SET_STACK_GUARD -/* Only exported for architectures that don't store the stack guard canary - in thread local area. */ -uintptr_t __stack_chk_guard attribute_relro; -# endif -# ifndef THREAD_SET_POINTER_GUARD -/* Only exported for architectures that don't store the pointer guard - value in thread local area. */ -uintptr_t __pointer_chk_guard_local - attribute_relro attribute_hidden __attribute__ ((nocommon)); -# endif -#endif - -#ifdef HAVE_PTR_NTHREADS -/* We need atomic operations. */ -# include <atomic.h> -#endif - - -#ifndef SHARED -# include <link.h> -# include <dl-irel.h> - -# ifdef ELF_MACHINE_IRELA -# define IREL_T ElfW(Rela) -# define IPLT_START __rela_iplt_start -# define IPLT_END __rela_iplt_end -# define IREL elf_irela -# elif defined ELF_MACHINE_IREL -# define IREL_T ElfW(Rel) -# define IPLT_START __rel_iplt_start -# define IPLT_END __rel_iplt_end -# define IREL elf_irel -# endif - -static void -apply_irel (void) -{ -# ifdef IREL - /* We use weak references for these so that we'll still work with a linker - that doesn't define them. Such a linker doesn't support IFUNC at all - and so uses won't work, but a statically-linked program that doesn't - use any IFUNC symbols won't have a problem. */ - extern const IREL_T IPLT_START[] __attribute__ ((weak)); - extern const IREL_T IPLT_END[] __attribute__ ((weak)); - for (const IREL_T *ipltent = IPLT_START; ipltent < IPLT_END; ++ipltent) - IREL (ipltent); -# endif -} -#endif - - -#ifdef LIBC_START_MAIN -# ifdef LIBC_START_DISABLE_INLINE -# define STATIC static -# else -# define STATIC static inline __attribute__ ((always_inline)) -# endif -#else -# define STATIC -# define LIBC_START_MAIN __libc_start_main -#endif - -#ifdef MAIN_AUXVEC_ARG -/* main gets passed a pointer to the auxiliary. */ -# define MAIN_AUXVEC_DECL , void * -# define MAIN_AUXVEC_PARAM , auxvec -#else -# define MAIN_AUXVEC_DECL -# define MAIN_AUXVEC_PARAM -#endif - -#ifndef ARCH_INIT_CPU_FEATURES -# define ARCH_INIT_CPU_FEATURES() -#endif - -STATIC int LIBC_START_MAIN (int (*main) (int, char **, char ** - MAIN_AUXVEC_DECL), - int argc, - char **argv, -#ifdef LIBC_START_MAIN_AUXVEC_ARG - ElfW(auxv_t) *auxvec, -#endif - __typeof (main) init, - void (*fini) (void), - void (*rtld_fini) (void), - void *stack_end) - __attribute__ ((noreturn)); - - -/* Note: the fini parameter is ignored here for shared library. It - is registered with __cxa_atexit. This had the disadvantage that - finalizers were called in more than one place. */ -STATIC int -LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL), - int argc, char **argv, -#ifdef LIBC_START_MAIN_AUXVEC_ARG - ElfW(auxv_t) *auxvec, -#endif - __typeof (main) init, - void (*fini) (void), - void (*rtld_fini) (void), void *stack_end) -{ - /* Result of the 'main' function. */ - int result; - - __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up; - -#ifndef SHARED - char **ev = &argv[argc + 1]; - - __environ = ev; - - /* Store the lowest stack address. This is done in ld.so if this is - the code for the DSO. */ - __libc_stack_end = stack_end; - -# ifdef HAVE_AUX_VECTOR - /* First process the auxiliary vector since we need to find the - program header to locate an eventually present PT_TLS entry. */ -# ifndef LIBC_START_MAIN_AUXVEC_ARG - ElfW(auxv_t) *auxvec; - { - char **evp = ev; - while (*evp++ != NULL) - ; - auxvec = (ElfW(auxv_t) *) evp; - } -# endif - _dl_aux_init (auxvec); - if (GL(dl_phdr) == NULL) -# endif - { - /* Starting from binutils-2.23, the linker will define the - magic symbol __ehdr_start to point to our own ELF header - if it is visible in a segment that also includes the phdrs. - So we can set up _dl_phdr and _dl_phnum even without any - information from auxv. */ - - extern const ElfW(Ehdr) __ehdr_start - __attribute__ ((weak, visibility ("hidden"))); - if (&__ehdr_start != NULL) - { - assert (__ehdr_start.e_phentsize == sizeof *GL(dl_phdr)); - GL(dl_phdr) = (const void *) &__ehdr_start + __ehdr_start.e_phoff; - GL(dl_phnum) = __ehdr_start.e_phnum; - } - } - - /* Initialize very early so that tunables can use it. */ - __libc_init_secure (); - - __tunables_init (__environ); - - ARCH_INIT_CPU_FEATURES (); - - /* Perform IREL{,A} relocations. */ - apply_irel (); - - /* The stack guard goes into the TCB, so initialize it early. */ - __libc_setup_tls (); - - /* Set up the stack checker's canary. */ - uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random); -# ifdef THREAD_SET_STACK_GUARD - THREAD_SET_STACK_GUARD (stack_chk_guard); -# else - __stack_chk_guard = stack_chk_guard; -# endif - -# ifdef DL_SYSDEP_OSCHECK - if (!__libc_multiple_libcs) - { - /* This needs to run to initiliaze _dl_osversion before TLS - setup might check it. */ - DL_SYSDEP_OSCHECK (__libc_fatal); - } -# endif - - /* Initialize libpthread if linked in. */ - if (__pthread_initialize_minimal != NULL) - __pthread_initialize_minimal (); - - /* Set up the pointer guard value. */ - uintptr_t pointer_chk_guard = _dl_setup_pointer_guard (_dl_random, - stack_chk_guard); -# ifdef THREAD_SET_POINTER_GUARD - THREAD_SET_POINTER_GUARD (pointer_chk_guard); -# else - __pointer_chk_guard_local = pointer_chk_guard; -# endif - -#endif - - /* Register the destructor of the dynamic linker if there is any. */ - if (__glibc_likely (rtld_fini != NULL)) - __cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL); - -#ifndef SHARED - /* Call the initializer of the libc. This is only needed here if we - are compiling for the static library in which case we haven't - run the constructors in `_dl_start_user'. */ - __libc_init_first (argc, argv, __environ); - - /* Register the destructor of the program, if any. */ - if (fini) - __cxa_atexit ((void (*) (void *)) fini, NULL, NULL); - - /* Some security at this point. Prevent starting a SUID binary where - the standard file descriptors are not opened. We have to do this - only for statically linked applications since otherwise the dynamic - loader did the work already. */ - if (__builtin_expect (__libc_enable_secure, 0)) - __libc_check_standard_fds (); -#endif - - /* Call the initializer of the program, if any. */ -#ifdef SHARED - if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0)) - GLRO(dl_debug_printf) ("\ninitialize program: %s\n\n", argv[0]); -#endif - if (init) - (*init) (argc, argv, __environ MAIN_AUXVEC_PARAM); - -#ifdef SHARED - /* Auditing checkpoint: we have a new object. */ - if (__glibc_unlikely (GLRO(dl_naudit) > 0)) - { - struct audit_ifaces *afct = GLRO(dl_audit); - struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded; - for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) - { - if (afct->preinit != NULL) - afct->preinit (&head->l_audit[cnt].cookie); - - afct = afct->next; - } - } -#endif - -#ifdef SHARED - if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS)) - GLRO(dl_debug_printf) ("\ntransferring control: %s\n\n", argv[0]); -#endif - -#ifndef SHARED - _dl_debug_initialize (0, LM_ID_BASE); -#endif -#ifdef HAVE_CLEANUP_JMP_BUF - /* Memory for the cancellation buffer. */ - struct pthread_unwind_buf unwind_buf; - - int not_first_call; - not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf); - if (__glibc_likely (! not_first_call)) - { - struct pthread *self = THREAD_SELF; - - /* Store old info. */ - unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf); - unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup); - - /* Store the new cleanup handler info. */ - THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf); - - /* Run the program. */ - result = main (argc, argv, __environ MAIN_AUXVEC_PARAM); - } - else - { - /* Remove the thread-local data. */ -# ifdef SHARED - PTHFCT_CALL (ptr__nptl_deallocate_tsd, ()); -# else - extern void __nptl_deallocate_tsd (void) __attribute ((weak)); - __nptl_deallocate_tsd (); -# endif - - /* One less thread. Decrement the counter. If it is zero we - terminate the entire process. */ - result = 0; -# ifdef SHARED - unsigned int *ptr = __libc_pthread_functions.ptr_nthreads; -# ifdef PTR_DEMANGLE - PTR_DEMANGLE (ptr); -# endif -# else - extern unsigned int __nptl_nthreads __attribute ((weak)); - unsigned int *const ptr = &__nptl_nthreads; -# endif - - if (! atomic_decrement_and_test (ptr)) - /* Not much left to do but to exit the thread, not the process. */ - __exit_thread (); - } -#else - /* Nothing fancy, just call the function. */ - result = main (argc, argv, __environ MAIN_AUXVEC_PARAM); -#endif - - exit (result); -} |