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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/blackfin/kernel/flat.c
10817 views
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/*

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 * Copyright 2007 Analog Devices Inc.

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 *

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 * Licensed under the GPL-2.

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 */

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#include <linux/module.h>

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#include <linux/sched.h>

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#include <linux/flat.h>

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#define FLAT_BFIN_RELOC_TYPE_16_BIT 0

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#define FLAT_BFIN_RELOC_TYPE_16H_BIT 1

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#define FLAT_BFIN_RELOC_TYPE_32_BIT 2

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unsigned long bfin_get_addr_from_rp(unsigned long *ptr,

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		unsigned long relval,

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		unsigned long flags,

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		unsigned long *persistent)

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{

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	unsigned short *usptr = (unsigned short *)ptr;

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	int type = (relval >> 26) & 7;

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	unsigned long val;

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	switch (type) {

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	case FLAT_BFIN_RELOC_TYPE_16_BIT:

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	case FLAT_BFIN_RELOC_TYPE_16H_BIT:

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		usptr = (unsigned short *)ptr;

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		pr_debug("*usptr = %x", get_unaligned(usptr));

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		val = get_unaligned(usptr);

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		val += *persistent;

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		break;

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	case FLAT_BFIN_RELOC_TYPE_32_BIT:

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		pr_debug("*ptr = %lx", get_unaligned(ptr));

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		val = get_unaligned(ptr);

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		break;

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	default:

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		pr_debug("BINFMT_FLAT: Unknown relocation type %x\n", type);

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		return 0;

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	}

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	/*

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	 * Stack-relative relocs contain the offset into the stack, we

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	 * have to add the stack's start address here and return 1 from

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	 * flat_addr_absolute to prevent the normal address calculations

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	 */

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	if (relval & (1 << 29))

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		return val + current->mm->context.end_brk;

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	if ((flags & FLAT_FLAG_GOTPIC) == 0)

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		val = htonl(val);

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	return val;

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}

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EXPORT_SYMBOL(bfin_get_addr_from_rp);

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/*

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 * Insert the address ADDR into the symbol reference at RP;

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 * RELVAL is the raw relocation-table entry from which RP is derived

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 */

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void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr,

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		unsigned long relval)

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{

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	unsigned short *usptr = (unsigned short *)ptr;

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	int type = (relval >> 26) & 7;

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	switch (type) {

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	case FLAT_BFIN_RELOC_TYPE_16_BIT:

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		put_unaligned(addr, usptr);

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		pr_debug("new value %x at %p", get_unaligned(usptr), usptr);

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		break;

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	case FLAT_BFIN_RELOC_TYPE_16H_BIT:

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		put_unaligned(addr >> 16, usptr);

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		pr_debug("new value %x", get_unaligned(usptr));

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		break;

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	case FLAT_BFIN_RELOC_TYPE_32_BIT:

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		put_unaligned(addr, ptr);

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		pr_debug("new ptr =%lx", get_unaligned(ptr));

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		break;

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	}

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}

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EXPORT_SYMBOL(bfin_put_addr_at_rp);

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