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
  28 int __cache_line_size attribute_hidden;
  29 /* The main work is done in the generic function.  */
  30 #define LIBC_START_MAIN generic_start_main
  31 #define LIBC_START_DISABLE_INLINE
  32 #define LIBC_START_MAIN_AUXVEC_ARG
  33 #define MAIN_AUXVEC_ARG
  34 #define INIT_MAIN_ARGS
  35 #include <csu/libc-start.c>
  36
  37 struct startup_info
  38   {
  39     void *__unbounded sda_base;
  40     int (*main) (int, char **, char **, void *);
  41     int (*init) (int, char **, char **, void *);
  42     void (*fini) (void);
  43   };
  44
  45 int
  46 /* GKM FIXME: GCC: this should get __BP_ prefix by virtue of the
  47    BPs in the arglist of startup_info.main and startup_info.init. */
  48   BP_SYM (__libc_start_main) (int argc, char *__unbounded *__unbounded ubp_av,
  49                               char *__unbounded *__unbounded ubp_ev,
  50                               ElfW (auxv_t) * __unbounded auxvec,
  51                               void (*rtld_fini) (void),
  52                               struct startup_info *__unbounded stinfo,
  53                               char *__unbounded *__unbounded stack_on_entry)
  54 {
  55 #if __BOUNDED_POINTERS__
  56   char **argv;
  57 #else
  58 # define argv ubp_av
  59 #endif
  60
  61   /* the PPC SVR4 ABI says that the top thing on the stack will
  62      be a NULL pointer, so if not we assume that we're being called
  63      as a statically-linked program by Linux...  */
  64   if (*stack_on_entry != NULL)
  65     {
  66       char *__unbounded * __unbounded temp;
  67       /* ...in which case, we have argc as the top thing on the
  68          stack, followed by argv (NULL-terminated), envp (likewise),
  69          and the auxilary vector.  */
  70       /* 32/64-bit agnostic load from stack */
  71       argc = *(long int *__unbounded) stack_on_entry;
  72       ubp_av = stack_on_entry + 1;
  73       ubp_ev = ubp_av + argc + 1;
  74 #ifdef HAVE_AUX_VECTOR
  75       temp = ubp_ev;
  76       while (*temp != NULL)
  77         ++temp;
  78       auxvec = (ElfW (auxv_t) *)++ temp;
  79 #endif
  80       rtld_fini = NULL;
  81     }
  82
  83   /* Initialize the __cache_line_size variable from the aux vector.  */
  84   for (ElfW (auxv_t) * av = auxvec; av->a_type != AT_NULL; ++av)
  85     switch (av->a_type)
  86       {
  87       case AT_DCACHEBSIZE:
  88         __cache_line_size = av->a_un.a_val;
  89         break;
  90       }
  91
  92   return generic_start_main (stinfo->main, argc, ubp_av, auxvec,
  93                              stinfo->init, stinfo->fini, rtld_fini,
  94                              stack_on_entry);
  95 }