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