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flat.c

/*
 *  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);

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