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

   1 /* Copyright (C) 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <ldsodefs.h>
  23 #include <sysdep.h>
  24 #include <bp-start.h>
  25 #include <bp-sym.h>
  26
  27 int __cache_line_size attribute_hidden;
  28 /* The main work is done in the generic function.  */
  29 #define LIBC_START_MAIN generic_start_main
  30 #define LIBC_START_DISABLE_INLINE
  31 #define LIBC_START_MAIN_AUXVEC_ARG
  32 #define MAIN_AUXVEC_ARG
  33 #define INIT_MAIN_ARGS
  34 #include <csu/libc-start.c>
  35
  36 struct startup_info
  37   {
  38     void *__unbounded sda_base;
  39     int (*main) (int, char **, char **, void *);
  40     int (*init) (int, char **, char **, void *);
  41     void (*fini) (void);
  42   };
  43
  44
  45 #ifdef SHARED
  46 # include <sys/time.h>
  47 # include <dl-vdso.h>
  48 # undef __gettimeofday
  49 # undef __clock_gettime
  50 # undef __clock_getres
  51 # include <bits/libc-vdso.h>
  52
  53 void *__vdso_gettimeofday;
  54 void *__vdso_clock_gettime;
  55 void *__vdso_clock_getres;
  56 void *__vdso_get_tbfreq;
  57
  58 static inline void _libc_vdso_platform_setup (void)
  59   {
  60     __vdso_gettimeofday = _dl_vdso_vsym ("__kernel_gettimeofday",
  61                                          "LINUX_2.6.15");
  62
  63     __vdso_clock_gettime = _dl_vdso_vsym ("__kernel_clock_gettime",
  64                                           "LINUX_2.6.15");
  65
  66     __vdso_clock_getres = _dl_vdso_vsym ("__kernel_clock_getres",
  67                                          "LINUX_2.6.15");
  68
  69     __vdso_get_tbfreq = _dl_vdso_vsym ("__kernel_vdso_get_tbfreq",
  70                                        "LINUX_2.6.15");
  71   }
  72 #endif
  73
  74 int
  75 /* GKM FIXME: GCC: this should get __BP_ prefix by virtue of the
  76    BPs in the arglist of startup_info.main and startup_info.init. */
  77   BP_SYM (__libc_start_main) (int argc, char *__unbounded *__unbounded ubp_av,
  78                               char *__unbounded *__unbounded ubp_ev,
  79                               ElfW (auxv_t) * __unbounded auxvec,
  80                               void (*rtld_fini) (void),
  81                               struct startup_info *__unbounded stinfo,
  82                               char *__unbounded *__unbounded stack_on_entry)
  83 {
  84 #if __BOUNDED_POINTERS__
  85   char **argv;
  86 #else
  87 # define argv ubp_av
  88 #endif
  89
  90   /* the PPC SVR4 ABI says that the top thing on the stack will
  91      be a NULL pointer, so if not we assume that we're being called
  92      as a statically-linked program by Linux...  */
  93   if (*stack_on_entry != NULL)
  94     {
  95       char *__unbounded * __unbounded temp;
  96       /* ...in which case, we have argc as the top thing on the
  97          stack, followed by argv (NULL-terminated), envp (likewise),
  98          and the auxilary vector.  */
  99       /* 32/64-bit agnostic load from stack */
 100       argc = *(long int *__unbounded) stack_on_entry;
 101       ubp_av = stack_on_entry + 1;
 102       ubp_ev = ubp_av + argc + 1;
 103 #ifdef HAVE_AUX_VECTOR
 104       temp = ubp_ev;
 105       while (*temp != NULL)
 106         ++temp;
 107       auxvec = (ElfW (auxv_t) *)++ temp;
 108 #endif
 109       rtld_fini = NULL;
 110     }
 111
 112   /* Initialize the __cache_line_size variable from the aux vector.  */
 113   for (ElfW (auxv_t) * av = auxvec; av->a_type != AT_NULL; ++av)
 114     switch (av->a_type)
 115       {
 116       case AT_DCACHEBSIZE:
 117         __cache_line_size = av->a_un.a_val;
 118         break;
 119       }
 120 #ifdef SHARED
 121   /* Resolve and initialize function pointers for VDSO functions.  */
 122   _libc_vdso_platform_setup ();
 123 #endif
 124   return generic_start_main (stinfo->main, argc, ubp_av, auxvec,
 125                              stinfo->init, stinfo->fini, rtld_fini,
 126                              stack_on_entry);
 127 }