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

   1 /* Copyright (C) 1998-2015 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
  23
  24 int __cache_line_size attribute_hidden;
  25 /* The main work is done in the generic function.  */
  26 #define LIBC_START_MAIN generic_start_main
  27 #define LIBC_START_DISABLE_INLINE
  28 #define LIBC_START_MAIN_AUXVEC_ARG
  29 #define MAIN_AUXVEC_ARG
  30 #define INIT_MAIN_ARGS
  31 #include <csu/libc-start.c>
  32
  33 struct startup_info
  34   {
  35     void *sda_base;
  36     int (*main) (int, char **, char **, void *);
  37     int (*init) (int, char **, char **, void *);
  38     void (*fini) (void);
  39   };
  40
  41 int
  42 __libc_start_main (int argc, char **argv,
  43                    char **ev,
  44                    ElfW (auxv_t) * auxvec,
  45                    void (*rtld_fini) (void),
  46                    struct startup_info *stinfo,
  47                    char **stack_on_entry)
  48 {
  49   /* the PPC SVR4 ABI says that the top thing on the stack will
  50      be a NULL pointer, so if not we assume that we're being called
  51      as a statically-linked program by Linux...  */
  52   if (*stack_on_entry != NULL)
  53     {
  54       char **temp;
  55       /* ...in which case, we have argc as the top thing on the
  56          stack, followed by argv (NULL-terminated), envp (likewise),
  57          and the auxiliary vector.  */
  58       /* 32/64-bit agnostic load from stack */
  59       argc = *(long int *) stack_on_entry;
  60       argv = stack_on_entry + 1;
  61       ev = argv + argc + 1;
  62 #ifdef HAVE_AUX_VECTOR
  63       temp = ev;
  64       while (*temp != NULL)
  65         ++temp;
  66       auxvec = (ElfW (auxv_t) *)++ temp;
  67 #endif
  68       rtld_fini = NULL;
  69     }
  70
  71   /* Initialize the __cache_line_size variable from the aux vector.  */
  72   for (ElfW (auxv_t) * av = auxvec; av->a_type != AT_NULL; ++av)
  73     switch (av->a_type)
  74       {
  75       case AT_DCACHEBSIZE:
  76         __cache_line_size = av->a_un.a_val;
  77         break;
  78       }
  79
  80   return generic_start_main (stinfo->main, argc, argv, auxvec,
  81                              stinfo->init, stinfo->fini, rtld_fini,
  82                              stack_on_entry);
  83 }