sysdeps/unix/sysv/linux/powerpc/libc-start.c

   1 /* Copyright (C) 1998,2000,2001,2002,2003,2004,2005 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   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.
   8
   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.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <ldsodefs.h>
  22 #include <bp-start.h>
  23 #include <bp-sym.h>
  24
  25 extern int __cache_line_size;
  26 weak_extern (__cache_line_size)
  27 /* The main work is done in the generic function.  */
  28 #define LIBC_START_MAIN generic_start_main
  29 #define LIBC_START_DISABLE_INLINE
  30 #define LIBC_START_MAIN_AUXVEC_ARG
  31 #define MAIN_AUXVEC_ARG
  32 #define INIT_MAIN_ARGS
  33 #include <csu/libc-start.c>
  34
  35 struct startup_info
  36   {
  37     void *__unbounded sda_base;
  38     int (*main) (int, char **, char **, void *);
  39     int (*init) (int, char **, char **, void *);
  40     void (*fini) (void);
  41   };
  42
  43
  44 #ifdef SHARED
  45 # include <sys/time.h>
  46 # include <dl-vdso.h>
  47 # undef __gettimeofday
  48 # undef __clock_gettime
  49 # undef __clock_getres
  50 # include <bits/libc-vdso.h>
  51
  52 void *__vdso_gettimeofday;
  53 void *__vdso_clock_gettime;
  54 void *__vdso_clock_getres;
  55 void *__vdso_get_tbfreq;
  56
  57 static inline void _libc_vdso_platform_setup (void)
  58   {
  59     __vdso_gettimeofday = _dl_vdso_vsym ("__kernel_gettimeofday",
  60                                          "LINUX_2.6.15");
  61
  62     __vdso_clock_gettime = _dl_vdso_vsym ("__kernel_clock_gettime",
  63                                           "LINUX_2.6.15");
  64
  65     __vdso_clock_getres = _dl_vdso_vsym ("__kernel_clock_getres",
  66                                          "LINUX_2.6.15");
  67
  68     __vdso_get_tbfreq = _dl_vdso_vsym ("__kernel_vdso_get_tbfreq",
  69                                        "LINUX_2.6.15");
  70   }
  71 #endif
  72
  73 int
  74 /* GKM FIXME: GCC: this should get __BP_ prefix by virtue of the
  75    BPs in the arglist of startup_info.main and startup_info.init. */
  76   BP_SYM (__libc_start_main) (int argc, char *__unbounded *__unbounded ubp_av,
  77                               char *__unbounded *__unbounded ubp_ev,
  78                               ElfW (auxv_t) * __unbounded auxvec,
  79                               void (*rtld_fini) (void),
  80                               struct startup_info *__unbounded stinfo,
  81                               char *__unbounded *__unbounded stack_on_entry)
  82 {
  83 #if __BOUNDED_POINTERS__
  84   char **argv;
  85 #else
  86 # define argv ubp_av
  87 #endif
  88
  89   /* the PPC SVR4 ABI says that the top thing on the stack will
  90      be a NULL pointer, so if not we assume that we're being called
  91      as a statically-linked program by Linux...  */
  92   if (*stack_on_entry != NULL)
  93     {
  94       char *__unbounded * __unbounded temp;
  95       /* ...in which case, we have argc as the top thing on the
  96          stack, followed by argv (NULL-terminated), envp (likewise),
  97          and the auxilary vector.  */
  98       /* 32/64-bit agnostic load from stack */
  99       argc = *(long int *__unbounded) stack_on_entry;
 100       ubp_av = stack_on_entry + 1;
 101       ubp_ev = ubp_av + argc + 1;
 102 #ifdef HAVE_AUX_VECTOR
 103       temp = ubp_ev;
 104       while (*temp != NULL)
 105         ++temp;
 106       auxvec = (ElfW (auxv_t) *)++ temp;
 107 #endif
 108       rtld_fini = NULL;
 109     }
 110
 111   /* Initialize the __cache_line_size variable from the aux vector.  */
 112   for (ElfW (auxv_t) * av = auxvec; av->a_type != AT_NULL; ++av)
 113     switch (av->a_type)
 114       {
 115       case AT_DCACHEBSIZE:
 116         {
 117           int *cls = &__cache_line_size;
 118           if (cls != NULL)
 119             *cls = av->a_un.a_val;
 120         }
 121         break;
 122       }
 123 #ifdef SHARED
 124   /* Resolve and initialize function pointers for VDSO functions.  */
 125   _libc_vdso_platform_setup ();
 126 #endif
 127   return generic_start_main (stinfo->main, argc, ubp_av, auxvec,
 128                              stinfo->init, stinfo->fini, rtld_fini,
 129                              stack_on_entry);
 130 }