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)  * Returns 0 if exception before NUL or reaching the supplied limit (N),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * a value greater than N if the string is longer than the limit, else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * strlen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Inputs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *	in0:	address of buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *	in1:	string length limit N
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Outputs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *	r8:	0 in case of fault, strlen(buffer)+1 otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * Copyright (C) 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/asmmacro.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) GLOBAL_ENTRY(__strnlen_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	.prologue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	alloc r2=ar.pfs,2,0,0,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	.save ar.lc, r16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	mov r16=ar.lc			// preserve ar.lc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	.body
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	add r3=-1,in1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	mov ar.lc=r3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	mov r9=0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	// XXX braindead strlen loop---this needs to be optimized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) .Loop1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	EXCLR(.Lexit, ld1 r8=[in0],1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	add r9=1,r9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	cmp.eq p6,p0=r8,r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) (p6)	br.cond.dpnt .Lexit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	br.cloop.dptk.few .Loop1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	add r9=1,in1			// NUL not found---return N+1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .Lexit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	mov r8=r9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	mov ar.lc=r16			// restore ar.lc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	br.ret.sptk.many rp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) END(__strnlen_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) EXPORT_SYMBOL(__strnlen_user)