-/* Copyright (C) 1998-2006, 2007, 2009 Free Software Foundation, Inc.
+/* Copyright (C) 1998-2015 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
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. */
+ 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 <bp-start.h>
-#include <bp-sym.h>
+#include <exit-thread.h>
extern void __libc_init_first (int argc, char **argv, char **envp);
+#ifndef SHARED
+extern void __libc_csu_irel (void);
+#endif
extern int __libc_multiple_libcs;
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
#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
# endif
#else
# define STATIC
-# define LIBC_START_MAIN BP_SYM (__libc_start_main)
+# define LIBC_START_MAIN __libc_start_main
#endif
#ifdef MAIN_AUXVEC_ARG
STATIC int LIBC_START_MAIN (int (*main) (int, char **, char **
MAIN_AUXVEC_DECL),
int argc,
- char *__unbounded *__unbounded ubp_av,
+ char **argv,
#ifdef LIBC_START_MAIN_AUXVEC_ARG
- ElfW(auxv_t) *__unbounded auxvec,
+ ElfW(auxv_t) *auxvec,
#endif
__typeof (main) init,
void (*fini) (void),
void (*rtld_fini) (void),
- void *__unbounded stack_end)
+ void *stack_end)
__attribute__ ((noreturn));
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,
+ int argc, char **argv,
#ifdef LIBC_START_MAIN_AUXVEC_ARG
- ElfW(auxv_t) *__unbounded auxvec,
+ ElfW(auxv_t) *auxvec,
#endif
__typeof (main) init,
void (*fini) (void),
- void (*rtld_fini) (void), void *__unbounded stack_end)
+ void (*rtld_fini) (void), void *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];
+ char **ev = &argv[argc + 1];
- INIT_ARGV_and_ENVIRON;
+ __environ = ev;
/* Store the lowest stack address. This is done in ld.so if this is
the code for the DSO. */
/* 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;
+ ElfW(auxv_t) *auxvec;
{
- char *__unbounded *__unbounded evp = ubp_ev;
+ char **evp = ev;
while (*evp++ != NULL)
;
- auxvec = (ElfW(auxv_t) *__unbounded) evp;
+ 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;
+ }
+ }
+
# ifdef DL_SYSDEP_OSCHECK
if (!__libc_multiple_libcs)
{
}
# endif
+ /* Perform IREL{,A} relocations. */
+ apply_irel ();
+
/* 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. */
# else
__stack_chk_guard = stack_chk_guard;
# endif
+
+ /* 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 (__builtin_expect (rtld_fini != NULL, 1))
+ if (__glibc_likely (rtld_fini != NULL))
__cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);
#ifndef SHARED
#ifdef SHARED
/* Auditing checkpoint: we have a new object. */
- if (__builtin_expect (GLRO(dl_naudit) > 0, 0))
+ 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;
#endif
#ifdef SHARED
- if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
+ 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 (__builtin_expect (! not_first_call, 1))
+ if (__glibc_likely (! not_first_call))
{
struct pthread *self = THREAD_SELF;
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;
if (! atomic_decrement_and_test (ptr))
/* Not much left to do but to exit the thread, not the process. */
- __exit_thread (0);
+ __exit_thread ();
}
#else
/* Nothing fancy, just call the function. */
projects / platform / upstream / glibc.git / blobdiff