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

   1 /* Copyright (C) 1998-2013 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdlib.h>
  19 #include <unistd.h>
  20 #include <ldsodefs.h>
  21 #include <sysdep.h>
  22 #include <bp-start.h>
  23 #include <bp-sym.h>
  24
  25
  26 int __cache_line_size attribute_hidden;
  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 int
  44 /* GKM FIXME: GCC: this should get __BP_ prefix by virtue of the
  45    BPs in the arglist of startup_info.main and startup_info.init. */
  46   BP_SYM (__libc_start_main) (int argc, char *__unbounded *__unbounded ubp_av,
  47                               char *__unbounded *__unbounded ubp_ev,
  48                               ElfW (auxv_t) * __unbounded auxvec,
  49                               void (*rtld_fini) (void),
  50                               struct startup_info *__unbounded stinfo,
  51                               char *__unbounded *__unbounded stack_on_entry)
  52 {
  53 #if __BOUNDED_POINTERS__
  54   char **argv;
  55 #else
  56 # define argv ubp_av
  57 #endif
  58
  59   /* the PPC SVR4 ABI says that the top thing on the stack will
  60      be a NULL pointer, so if not we assume that we're being called
  61      as a statically-linked program by Linux...  */
  62   if (*stack_on_entry != NULL)
  63     {
  64       char *__unbounded * __unbounded temp;
  65       /* ...in which case, we have argc as the top thing on the
  66          stack, followed by argv (NULL-terminated), envp (likewise),
  67          and the auxilary vector.  */
  68       /* 32/64-bit agnostic load from stack */
  69       argc = *(long int *__unbounded) stack_on_entry;
  70       ubp_av = stack_on_entry + 1;
  71       ubp_ev = ubp_av + argc + 1;
  72 #ifdef HAVE_AUX_VECTOR
  73       temp = ubp_ev;
  74       while (*temp != NULL)
  75         ++temp;
  76       auxvec = (ElfW (auxv_t) *)++ temp;
  77 #endif
  78       rtld_fini = NULL;
  79     }
  80
  81   /* Initialize the __cache_line_size variable from the aux vector.  */
  82   for (ElfW (auxv_t) * av = auxvec; av->a_type != AT_NULL; ++av)
  83     switch (av->a_type)
  84       {
  85       case AT_DCACHEBSIZE:
  86         __cache_line_size = av->a_un.a_val;
  87         break;
  88       }
  89
  90   return generic_start_main (stinfo->main, argc, ubp_av, auxvec,
  91                              stinfo->init, stinfo->fini, rtld_fini,
  92                              stack_on_entry);
  93 }