/*
* uClinux flat-format executables
*
* Copyright (C) 2005 John Williams <[email protected]>
*
* 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 */