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flat.h

/*
 * uClinux flat-format executables
 *
 * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file COPYING in the main directory of this
 * archive for more details.
 */

#ifndef _ASM_MICROBLAZE_FLAT_H
#define _ASM_MICROBLAZE_FLAT_H

#include <asm/unaligned.h>

#define     flat_argvp_envp_on_stack()    0
#define     flat_old_ram_flag(flags)      (flags)
#define     flat_reloc_valid(reloc, size) ((reloc) <= (size))
#define     flat_set_persistent(relval, p)            0

/*
 * Microblaze works a little differently from other arches, because
 * of the MICROBLAZE_64 reloc type. Here, a 32 bit address is split
 * over two instructions, an 'imm' instruction which provides the top
 * 16 bits, then the instruction "proper" which provides the low 16
 * bits.
 */

/*
 * Crack open a symbol reference and extract the address to be
 * relocated. rp is a potentially unaligned pointer to the
 * reference
 */

static inline unsigned long
flat_get_addr_from_rp(unsigned long *rp, unsigned long relval,
                  unsigned long flags, unsigned long *persistent)
{
      unsigned long addr;
      (void)flags;

      /* Is it a split 64/32 reference? */
      if (relval & 0x80000000) {
            /* Grab the two halves of the reference */
            unsigned long val_hi, val_lo;

            val_hi = get_unaligned(rp);
            val_lo = get_unaligned(rp+1);

            /* Crack the address out */
            addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff);
      } else {
            /* Get the address straight out */
            addr = get_unaligned(rp);
      }

      return addr;
}

/*
 * Insert an address into the symbol reference at rp. rp is potentially
 * unaligned.
 */

static inline void
flat_put_addr_at_rp(unsigned long *rp, unsigned long addr, unsigned long relval)
{
      /* Is this a split 64/32 reloc? */
      if (relval & 0x80000000) {
            /* Get the two "halves" */
            unsigned long val_hi = get_unaligned(rp);
            unsigned long val_lo = get_unaligned(rp + 1);

            /* insert the address */
            val_hi = (val_hi & 0xffff0000) | addr >> 16;
            val_lo = (val_lo & 0xffff0000) | (addr & 0xffff);

            /* store the two halves back into memory */
            put_unaligned(val_hi, rp);
            put_unaligned(val_lo, rp+1);
      } else {
            /* Put it straight in, no messing around */
            put_unaligned(addr, rp);
      }
}

#define     flat_get_relocate_addr(rel)   (rel & 0x7fffffff)

#endif /* _ASM_MICROBLAZE_FLAT_H */

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