text: /*
   *  arch/blackfin/kernel/flat.c
   *
   *  Copyright (C) 2007 Analog Devices, Inc.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program 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 General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #include <linux/module.h>
  #include <linux/sched.h>
  #include <linux/flat.h>
  
  #define FLAT_BFIN_RELOC_TYPE_16_BIT 0
  #define FLAT_BFIN_RELOC_TYPE_16H_BIT 1
  #define FLAT_BFIN_RELOC_TYPE_32_BIT 2
  
  unsigned long bfin_get_addr_from_rp(unsigned long *ptr,
  		unsigned long relval,
  		unsigned long flags,
  		unsigned long *persistent)
  {
  	unsigned short *usptr = (unsigned short *)ptr;
  	int type = (relval >> 26) & 7;
  	unsigned long val;
  
  	switch (type) {
  	case FLAT_BFIN_RELOC_TYPE_16_BIT:
  	case FLAT_BFIN_RELOC_TYPE_16H_BIT:
  		usptr = (unsigned short *)ptr;
  		pr_debug("*usptr = %x", get_unaligned(usptr));
  		val = get_unaligned(usptr);
  		val += *persistent;
  		break;
  
  	case FLAT_BFIN_RELOC_TYPE_32_BIT:
  		pr_debug("*ptr = %lx", get_unaligned(ptr));
  		val = get_unaligned(ptr);
  		break;
  
  	default:
  		pr_debug("BINFMT_FLAT: Unknown relocation type %x\n", type);
  		return 0;
  	}
  
  	/*
  	 * Stack-relative relocs contain the offset into the stack, we
  	 * have to add the stack's start address here and return 1 from
  	 * flat_addr_absolute to prevent the normal address calculations
  	 */
  	if (relval & (1 << 29))
  		return val + current->mm->context.end_brk;
  
  	if ((flags & FLAT_FLAG_GOTPIC) == 0)
  		val = htonl(val);
  	return val;
  }
  EXPORT_SYMBOL(bfin_get_addr_from_rp);
  
  /*
   * Insert the address ADDR into the symbol reference at RP;
   * RELVAL is the raw relocation-table entry from which RP is derived
   */
  void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr,
  		unsigned long relval)
  {
  	unsigned short *usptr = (unsigned short *)ptr;
  	int type = (relval >> 26) & 7;
  
  	switch (type) {
  	case FLAT_BFIN_RELOC_TYPE_16_BIT:
  		put_unaligned(addr, usptr);
  		pr_debug("new value %x at %p", get_unaligned(usptr), usptr);
  		break;
  
  	case FLAT_BFIN_RELOC_TYPE_16H_BIT:
  		put_unaligned(addr >> 16, usptr);
  		pr_debug("new value %x", get_unaligned(usptr));
  		break;
  
  	case FLAT_BFIN_RELOC_TYPE_32_BIT:
  		put_unaligned(addr, ptr);
  		pr_debug("new ptr =%lx", get_unaligned(ptr));
  		break;
  	}
  }
  EXPORT_SYMBOL(bfin_put_addr_at_rp);
  