82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* uClinux flat-format executables
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*
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* Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
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*/
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#ifndef _ASM_MICROBLAZE_FLAT_H
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#define _ASM_MICROBLAZE_FLAT_H
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#include <linux/unaligned.h>
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/*
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* Microblaze works a little differently from other arches, because
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* of the MICROBLAZE_64 reloc type. Here, a 32 bit address is split
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* over two instructions, an 'imm' instruction which provides the top
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* 16 bits, then the instruction "proper" which provides the low 16
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* bits.
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*/
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/*
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* Crack open a symbol reference and extract the address to be
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* relocated. rp is a potentially unaligned pointer to the
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* reference
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*/
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static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
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u32 *addr)
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{
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u32 *p = (__force u32 *)rp;
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/* Is it a split 64/32 reference? */
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if (relval & 0x80000000) {
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/* Grab the two halves of the reference */
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u32 val_hi, val_lo;
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val_hi = get_unaligned(p);
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val_lo = get_unaligned(p+1);
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/* Crack the address out */
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*addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff);
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} else {
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/* Get the address straight out */
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*addr = get_unaligned(p);
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}
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return 0;
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}
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/*
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* Insert an address into the symbol reference at rp. rp is potentially
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* unaligned.
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*/
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static inline int
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flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 relval)
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{
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u32 *p = (__force u32 *)rp;
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/* Is this a split 64/32 reloc? */
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if (relval & 0x80000000) {
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/* Get the two "halves" */
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unsigned long val_hi = get_unaligned(p);
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unsigned long val_lo = get_unaligned(p + 1);
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/* insert the address */
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val_hi = (val_hi & 0xffff0000) | addr >> 16;
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val_lo = (val_lo & 0xffff0000) | (addr & 0xffff);
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/* store the two halves back into memory */
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put_unaligned(val_hi, p);
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put_unaligned(val_lo, p+1);
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} else {
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/* Put it straight in, no messing around */
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put_unaligned(addr, p);
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}
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return 0;
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}
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#define flat_get_relocate_addr(rel) (rel & 0x7fffffff)
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#endif /* _ASM_MICROBLAZE_FLAT_H */
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