Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * uClinux flat-format executables
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #ifndef _ASM_MICROBLAZE_FLAT_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #define _ASM_MICROBLAZE_FLAT_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * Microblaze works a little differently from other arches, because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * of the MICROBLAZE_64 reloc type. Here, a 32 bit address is split
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * over two instructions, an 'imm' instruction which provides the top
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * 16 bits, then the instruction "proper" which provides the low 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * Crack open a symbol reference and extract the address to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  * relocated. rp is a potentially unaligned pointer to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  * reference
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 					u32 *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	u32 *p = (__force u32 *)rp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	/* Is it a split 64/32 reference? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	if (relval & 0x80000000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		/* Grab the two halves of the reference */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		u32 val_hi, val_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		val_hi = get_unaligned(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		val_lo = get_unaligned(p+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		/* Crack the address out */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		*addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		/* Get the address straight out */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		*addr = get_unaligned(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)  * Insert an address into the symbol reference at rp. rp is potentially
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)  * unaligned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 relval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	u32 *p = (__force u32 *)rp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	/* Is this a split 64/32 reloc? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	if (relval & 0x80000000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		/* Get the two "halves" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 		unsigned long val_hi = get_unaligned(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 		unsigned long val_lo = get_unaligned(p + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		/* insert the address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 		val_hi = (val_hi & 0xffff0000) | addr >> 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		val_lo = (val_lo & 0xffff0000) | (addr & 0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 		/* store the two halves back into memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 		put_unaligned(val_hi, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		put_unaligned(val_lo, p+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 		/* Put it straight in, no messing around */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 		put_unaligned(addr, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #define	flat_get_relocate_addr(rel)	(rel & 0x7fffffff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #endif /* _ASM_MICROBLAZE_FLAT_H */