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)  * arch/alpha/lib/strncpy.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Contributed by Richard Henderson (rth@tamu.edu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copy no more than COUNT bytes of the null-terminated string from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * SRC to DST.  If SRC does not cover all of COUNT, the balance is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * zeroed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Or, rather, if the kernel cared about that weird ANSI quirk.  This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * version has cropped that bit o' nastiness as well as assuming that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * __stxncpy is in range of a branch.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	.set noat
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	.set noreorder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	.text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	.align 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	.globl strncpy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	.ent strncpy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) strncpy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	.frame $30, 0, $26
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	.prologue 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	mov	$16, $0		# set return value now
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	beq	$18, $zerolen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	unop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	bsr	$23, __stxncpy	# do the work of the copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	unop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	bne	$18, $multiword	# do we have full words left?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	subq	$24, 1, $3	# nope
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	subq	$27, 1, $4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	or	$3, $24, $3	# clear the bits between the last
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	or	$4, $27, $4	# written byte and the last byte in COUNT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	andnot	$3, $4, $4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	zap	$1, $4, $1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	stq_u	$1, 0($16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	ret
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	.align	4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) $multiword:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	subq	$27, 1, $2	# clear the final bits in the prev word
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	or	$2, $27, $2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	zapnot	$1, $2, $1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	subq	$18, 1, $18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	stq_u	$1, 0($16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	addq	$16, 8, $16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	unop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	beq	$18, 1f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	nop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	unop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	nop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	blbc	$18, 0f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	stq_u	$31, 0($16)	# zero one word
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	subq	$18, 1, $18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	addq	$16, 8, $16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	beq	$18, 1f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 0:	stq_u	$31, 0($16)	# zero two words
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	subq	$18, 2, $18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	stq_u	$31, 8($16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	addq	$16, 16, $16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	bne	$18, 0b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 1:	ldq_u	$1, 0($16)	# clear the leading bits in the final word
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	subq	$24, 1, $2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	or	$2, $24, $2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	zap	$1, $2, $1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	stq_u	$1, 0($16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) $zerolen:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	ret
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	.end	strncpy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	EXPORT_SYMBOL(strncpy)