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authorUlrich Drepper <drepper@redhat.com>2005-12-14 15:06:39 +0000
committerUlrich Drepper <drepper@redhat.com>2005-12-14 15:06:39 +0000
commit9d13fb2413921c713f83efe331e8e4d219c62c6b (patch)
tree2d44d7ac45ab2d147eb8361bbff880c365aa8ad5 /csu
parentb6ab06cef4670e02756bcdd4d2c33a49369a4346 (diff)
downloadglibc-9d13fb2413921c713f83efe331e8e4d219c62c6b.zip
glibc-9d13fb2413921c713f83efe331e8e4d219c62c6b.tar.gz
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Moved to csu/errno-loc.c.
Diffstat (limited to 'csu')
-rw-r--r--csu/errno.c53
-rw-r--r--csu/init-first.c59
-rw-r--r--csu/libc-start.c263
-rw-r--r--csu/libc-tls.c263
-rw-r--r--csu/start.c13
-rw-r--r--csu/sysdep.c2
6 files changed, 653 insertions, 0 deletions
diff --git a/csu/errno.c b/csu/errno.c
new file mode 100644
index 0000000..03d661b
--- /dev/null
+++ b/csu/errno.c
@@ -0,0 +1,53 @@
+/* Definition of `errno' variable. Canonical version.
+ Copyright (C) 2002, 2004 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <errno.h>
+#include <tls.h>
+#include <dl-sysdep.h>
+#undef errno
+
+#if RTLD_PRIVATE_ERRNO
+
+/* Code compiled for rtld refers only to this name. */
+int rtld_errno attribute_hidden;
+
+#elif USE___THREAD
+
+__thread int errno;
+extern __thread int __libc_errno __attribute__ ((alias ("errno")))
+ attribute_hidden;
+
+#else
+
+/* This differs from plain `int errno;' in that it doesn't create
+ a common definition, but a plain symbol that resides in .bss,
+ which can have an alias. */
+int errno __attribute__ ((nocommon));
+strong_alias (errno, _errno)
+
+/* We declare these with compat_symbol so that they are not visible at
+ link time. Programs must use the accessor functions. RTLD is special,
+ since it's not exported from there at any time. */
+# if defined HAVE_ELF && defined SHARED && defined DO_VERSIONING
+# include <shlib-compat.h>
+compat_symbol (libc, errno, errno, GLIBC_2_0);
+compat_symbol (libc, _errno, _errno, GLIBC_2_0);
+# endif
+
+#endif
diff --git a/csu/init-first.c b/csu/init-first.c
new file mode 100644
index 0000000..fa21274
--- /dev/null
+++ b/csu/init-first.c
@@ -0,0 +1,59 @@
+/* Initialization code run first thing by the ELF startup code. Stub version.
+ Copyright (C) 1995, 1997, 1998, 2001, 2002 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <unistd.h>
+#include <sys/types.h>
+
+/* Set nonzero if we have to be prepared for more then one libc being
+ used in the process. Safe assumption if initializer never runs. */
+int __libc_multiple_libcs attribute_hidden = 1;
+
+extern void __libc_init (int, char **, char **);
+#ifdef USE_NONOPTION_FLAGS
+extern void __getopt_clean_environment (char **);
+#endif
+
+#ifdef SHARED
+void
+__libc_init_first (void)
+{
+}
+#endif
+
+#ifdef SHARED
+/* NOTE! The linker notices the magical name `_init' and sets the DT_INIT
+ pointer in the dynamic section based solely on that. It is convention
+ for this function to be in the `.init' section, but the symbol name is
+ the only thing that really matters!! */
+void _init
+#else
+void __libc_init_first
+#endif
+(int argc, char *arg0, ...)
+{
+ char **argv = &arg0, **envp = &argv[argc + 1];
+
+ __environ = envp;
+ __libc_init (argc, argv, envp);
+
+#ifdef USE_NONOPTION_FLAGS
+ /* This is a hack to make the special getopt in GNU libc working. */
+ __getopt_clean_environment (envp);
+#endif
+}
diff --git a/csu/libc-start.c b/csu/libc-start.c
new file mode 100644
index 0000000..194db6b
--- /dev/null
+++ b/csu/libc-start.c
@@ -0,0 +1,263 @@
+/* Copyright (C) 1998-2003, 2004, 2005 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <bp-start.h>
+#include <bp-sym.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>
+extern void __pthread_initialize_minimal (void)
+# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP
+ __attribute__ ((weak))
+# endif
+ ;
+# 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
+#endif
+
+#ifdef HAVE_PTR_NTHREADS
+/* We need atomic operations. */
+# include <atomic.h>
+#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 BP_SYM (__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
+
+STATIC int LIBC_START_MAIN (int (*main) (int, char **, char **
+ MAIN_AUXVEC_DECL),
+ int argc,
+ char *__unbounded *__unbounded ubp_av,
+#ifdef LIBC_START_MAIN_AUXVEC_ARG
+ ElfW(auxv_t) *__unbounded auxvec,
+#endif
+ __typeof (main) init,
+ void (*fini) (void),
+ void (*rtld_fini) (void),
+ void *__unbounded 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 *__unbounded *__unbounded ubp_av,
+#ifdef LIBC_START_MAIN_AUXVEC_ARG
+ ElfW(auxv_t) *__unbounded auxvec,
+#endif
+ __typeof (main) init,
+ void (*fini) (void),
+ void (*rtld_fini) (void), void *__unbounded stack_end)
+{
+#if __BOUNDED_POINTERS__
+ char **argv;
+#else
+# define argv ubp_av
+#endif
+
+ /* Result of the 'main' function. */
+ int result;
+
+ __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
+
+#ifndef SHARED
+ char *__unbounded *__unbounded ubp_ev = &ubp_av[argc + 1];
+
+ INIT_ARGV_and_ENVIRON;
+
+ /* 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) *__unbounded auxvec;
+ {
+ char *__unbounded *__unbounded evp = ubp_ev;
+ while (*evp++ != NULL)
+ ;
+ auxvec = (ElfW(auxv_t) *__unbounded) evp;
+ }
+# endif
+ _dl_aux_init (auxvec);
+# 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 the thread library at least a bit since the libgcc
+ functions are using thread functions if these are available and
+ we need to setup errno. If there is no thread library and we
+ handle TLS the function is defined in the libc to initialized the
+ TLS handling. */
+# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP
+ if (__pthread_initialize_minimal)
+# endif
+ __pthread_initialize_minimal ();
+#endif
+
+# ifndef SHARED
+ /* Set up the stack checker's canary. */
+ uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard ();
+# ifdef THREAD_SET_STACK_GUARD
+ THREAD_SET_STACK_GUARD (stack_chk_guard);
+# else
+ __stack_chk_guard = stack_chk_guard;
+# endif
+#endif
+
+ /* Register the destructor of the dynamic linker if there is any. */
+ if (__builtin_expect (rtld_fini != NULL, 1))
+ __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 (__builtin_expect (GLRO(dl_naudit) > 0, 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 (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
+ GLRO(dl_debug_printf) ("\ntransferring control: %s\n\n", argv[0]);
+#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 (__builtin_expect (! not_first_call, 1))
+ {
+ 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
+ __libc_pthread_functions.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 *const ptr = __libc_pthread_functions.ptr_nthreads;
+# 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 (0);
+ }
+#else
+ /* Nothing fancy, just call the function. */
+ result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
+#endif
+
+ exit (result);
+}
diff --git a/csu/libc-tls.c b/csu/libc-tls.c
new file mode 100644
index 0000000..3544e39
--- /dev/null
+++ b/csu/libc-tls.c
@@ -0,0 +1,263 @@
+/* Initialization code for TLS in statically linked application.
+ Copyright (C) 2002, 2003, 2004, 2005 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <errno.h>
+#include <ldsodefs.h>
+#include <tls.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/param.h>
+
+
+#ifdef SHARED
+ #error makefile bug, this file is for static only
+#endif
+
+#ifdef USE_TLS
+extern ElfW(Phdr) *_dl_phdr;
+extern size_t _dl_phnum;
+
+
+static dtv_t static_dtv[2 + TLS_SLOTINFO_SURPLUS];
+
+
+static struct
+{
+ struct dtv_slotinfo_list si;
+ /* The dtv_slotinfo_list data structure does not include the actual
+ information since it is defined as an array of size zero. We define
+ here the necessary entries. Note that it is not important whether
+ there is padding or not since we will always access the information
+ through the 'si' element. */
+ struct dtv_slotinfo info[2 + TLS_SLOTINFO_SURPLUS];
+} static_slotinfo;
+
+/* Fake link map for the application. */
+static struct link_map static_map;
+
+
+/* Highest dtv index currently needed. */
+size_t _dl_tls_max_dtv_idx;
+/* Flag signalling whether there are gaps in the module ID allocation. */
+bool _dl_tls_dtv_gaps;
+/* Information about the dtv slots. */
+struct dtv_slotinfo_list *_dl_tls_dtv_slotinfo_list;
+/* Number of modules in the static TLS block. */
+size_t _dl_tls_static_nelem;
+/* Size of the static TLS block. Giving this initialized value
+ preallocates some surplus bytes in the static TLS area. */
+size_t _dl_tls_static_size = 2048;
+/* Size actually allocated in the static TLS block. */
+size_t _dl_tls_static_used;
+/* Alignment requirement of the static TLS block. */
+size_t _dl_tls_static_align;
+
+/* Generation counter for the dtv. */
+size_t _dl_tls_generation;
+
+
+/* Additional definitions needed by TLS initialization. */
+#ifdef TLS_INIT_HELPER
+TLS_INIT_HELPER
+#endif
+
+static inline void
+init_slotinfo (void)
+{
+ /* Create the slotinfo list. */
+ static_slotinfo.si.len = (((char *) (&static_slotinfo + 1)
+ - (char *) &static_slotinfo.si.slotinfo[0])
+ / sizeof static_slotinfo.si.slotinfo[0]);
+ // static_slotinfo.si.next = NULL; already zero
+
+ /* The slotinfo list. Will be extended by the code doing dynamic
+ linking. */
+ GL(dl_tls_max_dtv_idx) = 1;
+ GL(dl_tls_dtv_slotinfo_list) = &static_slotinfo.si;
+}
+
+static inline void
+init_static_tls (size_t memsz, size_t align)
+{
+ /* That is the size of the TLS memory for this object. The initialized
+ value of _dl_tls_static_size is provided by dl-open.c to request some
+ surplus that permits dynamic loading of modules with IE-model TLS. */
+ GL(dl_tls_static_size) = roundup (memsz + GL(dl_tls_static_size),
+ TLS_TCB_ALIGN);
+ GL(dl_tls_static_used) = memsz;
+ /* The alignment requirement for the static TLS block. */
+ GL(dl_tls_static_align) = align;
+ /* Number of elements in the static TLS block. */
+ GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx);
+}
+
+void
+__libc_setup_tls (size_t tcbsize, size_t tcbalign)
+{
+ void *tlsblock;
+ size_t memsz = 0;
+ size_t filesz = 0;
+ void *initimage = NULL;
+ size_t align = 0;
+ size_t max_align = tcbalign;
+ size_t tcb_offset;
+ ElfW(Phdr) *phdr;
+
+ /* Look through the TLS segment if there is any. */
+ if (_dl_phdr != NULL)
+ for (phdr = _dl_phdr; phdr < &_dl_phdr[_dl_phnum]; ++phdr)
+ if (phdr->p_type == PT_TLS)
+ {
+ /* Remember the values we need. */
+ memsz = phdr->p_memsz;
+ filesz = phdr->p_filesz;
+ initimage = (void *) phdr->p_vaddr;
+ align = phdr->p_align;
+ if (phdr->p_align > max_align)
+ max_align = phdr->p_align;
+ break;
+ }
+
+ /* We have to set up the TCB block which also (possibly) contains
+ 'errno'. Therefore we avoid 'malloc' which might touch 'errno'.
+ Instead we use 'sbrk' which would only uses 'errno' if it fails.
+ In this case we are right away out of memory and the user gets
+ what she/he deserves.
+
+ The initialized value of _dl_tls_static_size is provided by dl-open.c
+ to request some surplus that permits dynamic loading of modules with
+ IE-model TLS. */
+# if TLS_TCB_AT_TP
+ tcb_offset = roundup (memsz + GL(dl_tls_static_size), tcbalign);
+ tlsblock = __sbrk (tcb_offset + tcbsize + max_align);
+# elif TLS_DTV_AT_TP
+ tcb_offset = roundup (tcbsize, align ?: 1);
+ tlsblock = __sbrk (tcb_offset + memsz + max_align
+ + TLS_PRE_TCB_SIZE + GL(dl_tls_static_size));
+ tlsblock += TLS_PRE_TCB_SIZE;
+# else
+ /* In case a model with a different layout for the TCB and DTV
+ is defined add another #elif here and in the following #ifs. */
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+# endif
+
+ /* Align the TLS block. */
+ tlsblock = (void *) (((uintptr_t) tlsblock + max_align - 1)
+ & ~(max_align - 1));
+
+ /* Initialize the dtv. [0] is the length, [1] the generation counter. */
+ static_dtv[0].counter = (sizeof (static_dtv) / sizeof (static_dtv[0])) - 2;
+ // static_dtv[1].counter = 0; would be needed if not already done
+
+ /* Initialize the TLS block. */
+# if TLS_TCB_AT_TP
+ static_dtv[2].pointer.val = ((char *) tlsblock + tcb_offset
+ - roundup (memsz, align ?: 1));
+ static_map.l_tls_offset = roundup (memsz, align ?: 1);
+# elif TLS_DTV_AT_TP
+ static_dtv[2].pointer.val = (char *) tlsblock + tcb_offset;
+ static_map.l_tls_offset = tcb_offset;
+# else
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+# endif
+ static_dtv[2].pointer.is_static = true;
+ /* sbrk gives us zero'd memory, so we don't need to clear the remainder. */
+ memcpy (static_dtv[2].pointer.val, initimage, filesz);
+
+ /* Install the pointer to the dtv. */
+
+ /* Initialize the thread pointer. */
+# if TLS_TCB_AT_TP
+ INSTALL_DTV ((char *) tlsblock + tcb_offset, static_dtv);
+
+ const char *lossage = TLS_INIT_TP ((char *) tlsblock + tcb_offset, 0);
+# elif TLS_DTV_AT_TP
+ INSTALL_DTV (tlsblock, static_dtv);
+ const char *lossage = TLS_INIT_TP (tlsblock, 0);
+# else
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+# endif
+ if (__builtin_expect (lossage != NULL, 0))
+ __libc_fatal (lossage);
+
+ /* We have to create a fake link map which normally would be created
+ by the dynamic linker. It just has to have enough information to
+ make the TLS routines happy. */
+ static_map.l_tls_align = align;
+ static_map.l_tls_blocksize = memsz;
+ static_map.l_tls_initimage = initimage;
+ static_map.l_tls_initimage_size = filesz;
+ static_map.l_type = lt_executable;
+ static_map.l_tls_modid = 1;
+
+ init_slotinfo ();
+ // static_slotinfo.si.slotinfo[1].gen = 0; already zero
+ static_slotinfo.si.slotinfo[1].map = &static_map;
+
+ memsz = roundup (memsz, align ?: 1);
+
+# if TLS_TCB_AT_TP
+ memsz += tcbsize;
+# elif TLS_DTV_AT_TP
+ memsz += tcb_offset;
+# endif
+
+ init_static_tls (memsz, MAX (TLS_TCB_ALIGN, max_align));
+}
+
+/* This is called only when the data structure setup was skipped at startup,
+ when there was no need for it then. Now we have dynamically loaded
+ something needing TLS, or libpthread needs it. */
+int
+internal_function
+_dl_tls_setup (void)
+{
+ init_slotinfo ();
+ init_static_tls (
+# if TLS_TCB_AT_TP
+ TLS_TCB_SIZE,
+# else
+ 0,
+# endif
+ TLS_TCB_ALIGN);
+ return 0;
+}
+
+
+/* This is the minimal initialization function used when libpthread is
+ not used. */
+void
+__attribute__ ((weak))
+__pthread_initialize_minimal (void)
+{
+ __libc_setup_tls (TLS_INIT_TCB_SIZE, TLS_INIT_TCB_ALIGN);
+}
+
+#elif defined NONTLS_INIT_TP
+
+/* This is the minimal initialization function used when libpthread is
+ not used. */
+void
+__attribute__ ((weak))
+__pthread_initialize_minimal (void)
+{
+ NONTLS_INIT_TP;
+}
+
+#endif
diff --git a/csu/start.c b/csu/start.c
new file mode 100644
index 0000000..08f985c
--- /dev/null
+++ b/csu/start.c
@@ -0,0 +1,13 @@
+/* This file should define the low-level program entry point,
+ which should set up `__environ', and then do:
+ __libc_init(argc, argv, __environ);
+ exit(main(argc, argv, __environ));
+
+ This file should be prepared to be the first thing in the text section (on
+ Unix systems), or otherwise appropriately special. */
+
+/* The first piece of initialized data. */
+int __data_start = 0;
+#ifdef HAVE_WEAK_SYMBOLS
+weak_alias (__data_start, data_start)
+#endif
diff --git a/csu/sysdep.c b/csu/sysdep.c
new file mode 100644
index 0000000..5442eee
--- /dev/null
+++ b/csu/sysdep.c
@@ -0,0 +1,2 @@
+/* This file should contain any system-dependent functions
+ that will be used by many parts of the library. */