[linux-2.6-block.git] / arch / blackfin / kernel / flat.c

/*
 * Copyright 2007 Analog Devices Inc.
 *
 * Licensed under the GPL-2.
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/mm_types.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);
Commit	Line	Data
1394f032	1	/*
96f1050d	2	* Copyright 2007 Analog Devices Inc.
1394f032	3	*
96f1050d	4	* Licensed under the GPL-2.
1394f032 BW	5	*/
	6
	7	#include <linux/module.h>
	8	#include <linux/sched.h>
589ee628	9	#include <linux/mm_types.h>
1394f032 BW	10	#include <linux/flat.h>
	11
	12	#define FLAT_BFIN_RELOC_TYPE_16_BIT 0
	13	#define FLAT_BFIN_RELOC_TYPE_16H_BIT 1
	14	#define FLAT_BFIN_RELOC_TYPE_32_BIT 2
	15
	16	unsigned long bfin_get_addr_from_rp(unsigned long *ptr,
	17	unsigned long relval,
	18	unsigned long flags,
	19	unsigned long *persistent)
	20	{
	21	unsigned short usptr = (unsigned short )ptr;
	22	int type = (relval >> 26) & 7;
	23	unsigned long val;
	24
	25	switch (type) {
1f83b8f1 MF	26	case FLAT_BFIN_RELOC_TYPE_16_BIT:
	27	case FLAT_BFIN_RELOC_TYPE_16H_BIT:
	28	usptr = (unsigned short *)ptr;
	29	pr_debug("*usptr = %x", get_unaligned(usptr));
	30	val = get_unaligned(usptr);
	31	val += *persistent;
	32	break;
1394f032	33
1f83b8f1 MF	34	case FLAT_BFIN_RELOC_TYPE_32_BIT:
	35	pr_debug("*ptr = %lx", get_unaligned(ptr));
	36	val = get_unaligned(ptr);
	37	break;
1394f032	38
1f83b8f1 MF	39	default:
	40	pr_debug("BINFMT_FLAT: Unknown relocation type %x\n", type);
	41	return 0;
1394f032 BW	42	}
	43
	44	/*
	45	* Stack-relative relocs contain the offset into the stack, we
	46	* have to add the stack's start address here and return 1 from
	47	* flat_addr_absolute to prevent the normal address calculations
	48	*/
	49	if (relval & (1 << 29))
	50	return val + current->mm->context.end_brk;
	51
	52	if ((flags & FLAT_FLAG_GOTPIC) == 0)
	53	val = htonl(val);
	54	return val;
	55	}
	56	EXPORT_SYMBOL(bfin_get_addr_from_rp);
	57
	58	/*
	59	* Insert the address ADDR into the symbol reference at RP;
	60	* RELVAL is the raw relocation-table entry from which RP is derived
	61	*/
	62	void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr,
	63	unsigned long relval)
	64	{
	65	unsigned short usptr = (unsigned short )ptr;
	66	int type = (relval >> 26) & 7;
	67
	68	switch (type) {
1f83b8f1 MF	69	case FLAT_BFIN_RELOC_TYPE_16_BIT:
	70	put_unaligned(addr, usptr);
	71	pr_debug("new value %x at %p", get_unaligned(usptr), usptr);
	72	break;
1394f032	73
1f83b8f1 MF	74	case FLAT_BFIN_RELOC_TYPE_16H_BIT:
	75	put_unaligned(addr >> 16, usptr);
	76	pr_debug("new value %x", get_unaligned(usptr));
	77	break;
1394f032	78
1f83b8f1 MF	79	case FLAT_BFIN_RELOC_TYPE_32_BIT:
	80	put_unaligned(addr, ptr);
	81	pr_debug("new ptr =%lx", get_unaligned(ptr));
	82	break;
1394f032 BW	83	}
	84	}
	85	EXPORT_SYMBOL(bfin_put_addr_at_rp);