[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/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(u32 *ptr,
		u32 relval,
		u32 flags,
		u32 *persistent)
{
	unsigned short *usptr = (unsigned short *)ptr;
	int type = (relval >> 26) & 7;
	u32 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 = %x", 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(u32 *ptr, u32 addr, u32 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 =%x", 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
468138d7 AV	16	unsigned long bfin_get_addr_from_rp(u32 *ptr,
	17	u32 relval,
	18	u32 flags,
	19	u32 *persistent)
1394f032 BW	20	{
	21	unsigned short usptr = (unsigned short )ptr;
	22	int type = (relval >> 26) & 7;
468138d7	23	u32 val;
1394f032 BW	24
1394f032 BW	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	34	case FLAT_BFIN_RELOC_TYPE_32_BIT:
cb0fbbf2	35	pr_debug("*ptr = %x", get_unaligned(ptr));
1f83b8f1 MF	36	val = get_unaligned(ptr);
1f83b8f1 MF	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	*/
468138d7	62	void bfin_put_addr_at_rp(u32 *ptr, u32 addr, u32 relval)
1394f032 BW	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:
1f83b8f1 MF	79	put_unaligned(addr, ptr);
cb0fbbf2	80	pr_debug("new ptr =%x", get_unaligned(ptr));
1f83b8f1	81	break;
1394f032 BW	82	}
	83	}
	84	EXPORT_SYMBOL(bfin_put_addr_at_rp);