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