[mirror_ubuntu-artful-kernel.git] / arch / microblaze / include / asm / 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 int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
					u32 *addr, u32 *persistent)
{
	u32 *p = (__force u32 *)rp;

	/* Is it a split 64/32 reference? */
	if (relval & 0x80000000) {
		/* Grab the two halves of the reference */
		u32 val_hi, val_lo;

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

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

	return 0;
}

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

static inline void
flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 relval)
{
	u32 *p = (__force u32 *)rp;
	/* Is this a split 64/32 reloc? */
	if (relval & 0x80000000) {
		/* Get the two "halves" */
		unsigned long val_hi = get_unaligned(p);
		unsigned long val_lo = get_unaligned(p + 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, p);
		put_unaligned(val_lo, p+1);
	} else {
		/* Put it straight in, no messing around */
		put_unaligned(addr, p);
	}
	return 0;
}

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

#endif /* _ASM_MICROBLAZE_FLAT_H */
Commit	Line	Data
c6087fdc MS	1	/*
	2	* uClinux flat-format executables
	3	*
	4	* Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
	5	*
	6	* This file is subject to the terms and conditions of the GNU General
	7	* Public License. See the file COPYING in the main directory of this
	8	* archive for more details.
	9	*/
	10
	11	#ifndef _ASM_MICROBLAZE_FLAT_H
	12	#define _ASM_MICROBLAZE_FLAT_H
	13
	14	#include <asm/unaligned.h>
	15
c6087fdc MS	16	#define flat_argvp_envp_on_stack() 0
	17	#define flat_old_ram_flag(flags) (flags)
	18	#define flat_reloc_valid(reloc, size) ((reloc) <= (size))
	19	#define flat_set_persistent(relval, p) 0
	20
	21	/*
	22	* Microblaze works a little differently from other arches, because
	23	* of the MICROBLAZE_64 reloc type. Here, a 32 bit address is split
	24	* over two instructions, an 'imm' instruction which provides the top
	25	* 16 bits, then the instruction "proper" which provides the low 16
	26	* bits.
	27	*/
	28
	29	/*
	30	* Crack open a symbol reference and extract the address to be
	31	* relocated. rp is a potentially unaligned pointer to the
	32	* reference
	33	*/
	34
468138d7 AV	35	static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
468138d7 AV	36	u32 addr, u32 persistent)
c6087fdc	37	{
468138d7	38	u32 p = (__force u32 )rp;
c6087fdc MS	39
	40	/* Is it a split 64/32 reference? */
	41	if (relval & 0x80000000) {
	42	/* Grab the two halves of the reference */
468138d7	43	u32 val_hi, val_lo;
c6087fdc	44
468138d7 AV	45	val_hi = get_unaligned(p);
468138d7 AV	46	val_lo = get_unaligned(p+1);
c6087fdc MS	47
c6087fdc MS	48	/* Crack the address out */
468138d7	49	*addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff);
c6087fdc MS	50	} else {
c6087fdc MS	51	/* Get the address straight out */
468138d7	52	*addr = get_unaligned(p);
c6087fdc MS	53	}
c6087fdc MS	54
468138d7	55	return 0;
c6087fdc MS	56	}
	57
	58	/*
	59	* Insert an address into the symbol reference at rp. rp is potentially
	60	* unaligned.
	61	*/
	62
	63	static inline void
468138d7	64	flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 relval)
c6087fdc	65	{
468138d7	66	u32 p = (__force u32 )rp;
c6087fdc MS	67	/* Is this a split 64/32 reloc? */
	68	if (relval & 0x80000000) {
	69	/* Get the two "halves" */
468138d7 AV	70	unsigned long val_hi = get_unaligned(p);
468138d7 AV	71	unsigned long val_lo = get_unaligned(p + 1);
c6087fdc MS	72
	73	/* insert the address */
	74	val_hi = (val_hi & 0xffff0000) \| addr >> 16;
	75	val_lo = (val_lo & 0xffff0000) \| (addr & 0xffff);
	76
	77	/* store the two halves back into memory */
468138d7 AV	78	put_unaligned(val_hi, p);
468138d7 AV	79	put_unaligned(val_lo, p+1);
c6087fdc MS	80	} else {
c6087fdc MS	81	/* Put it straight in, no messing around */
468138d7	82	put_unaligned(addr, p);
c6087fdc	83	}
468138d7	84	return 0;
c6087fdc MS	85	}
	86
	87	#define flat_get_relocate_addr(rel) (rel & 0x7fffffff)
	88
	89	#endif /* _ASM_MICROBLAZE_FLAT_H */