glibc/sysdeps/powerpc/elf/libc-start.c

/* Copyright (C) 1998,2000,2001,2002,2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <stdlib.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <bp-start.h>
#include <bp-sym.h>

extern int __cache_line_size;
weak_extern (__cache_line_size)

/* Scan the Aux Vector for the "Data Cache Block Size" entry.  If found
   verify that the static extern __cache_line_size is defined by checking
   for not NULL.  If it is defined then assign the cache block size
   value to __cache_line_size.  */
static inline void
__aux_init_cache (ElfW(auxv_t) *av)
{
  for (; av->a_type != AT_NULL; ++av)
    switch (av->a_type)
      {
      case AT_DCACHEBSIZE:
        {
          int *cls = & __cache_line_size;
          if (cls != NULL)
            *cls = av->a_un.a_val;
        }
        break;
      }
}
/* This is used in sysdeps/generic/libc-start.c.  */
#define AUX_VECTOR_INIT __aux_init_cache

/* The main work is done in the generic function.  */
#define LIBC_START_MAIN generic_start_main
#define LIBC_START_DISABLE_INLINE
#define LIBC_START_MAIN_AUXVEC_ARG
#define MAIN_AUXVEC_ARG
#define INIT_MAIN_ARGS
#include <sysdeps/generic/libc-start.c>


struct startup_info
{
  void *__unbounded sda_base;
  int (*main) (int, char **, char **, void *);
  int (*init) (int, char **, char **, void *);
  void (*fini) (void);
};


int
/* GKM FIXME: GCC: this should get __BP_ prefix by virtue of the
   BPs in the arglist of startup_info.main and startup_info.init. */
BP_SYM (__libc_start_main) (int argc, char *__unbounded *__unbounded ubp_av,
			    char *__unbounded *__unbounded ubp_ev,
			    ElfW(auxv_t) *__unbounded auxvec,
			    void (*rtld_fini) (void),
			    struct startup_info *__unbounded stinfo,
			    char *__unbounded *__unbounded stack_on_entry)
{
#if __BOUNDED_POINTERS__
  char **argv;
#else
# define argv ubp_av
#endif

  /* the PPC SVR4 ABI says that the top thing on the stack will
     be a NULL pointer, so if not we assume that we're being called
     as a statically-linked program by Linux...	 */
  if (*stack_on_entry != NULL)
    {
      char *__unbounded *__unbounded temp;
      /* ...in which case, we have argc as the top thing on the
	 stack, followed by argv (NULL-terminated), envp (likewise),
	 and the auxilary vector.  */
      /* 32/64-bit agnostic load from stack */
      argc = *(long int *__unbounded) stack_on_entry;
      ubp_av = stack_on_entry + 1;
      ubp_ev = ubp_av + argc + 1;
#ifdef HAVE_AUX_VECTOR
      temp = ubp_ev;
      while (*temp != NULL)
        ++temp;
      auxvec = (ElfW(auxv_t) *)++temp;
#endif
      rtld_fini = NULL;
    }

  /* Initialize the __cache_line_size variable from the aux vector.  */
  __aux_init_cache (auxvec);

  return generic_start_main (stinfo->main, argc, ubp_av, auxvec,
			     stinfo->init, stinfo->fini, rtld_fini,
			     stack_on_entry);
}