Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *  linux/arch/arm/lib/clear_user.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *  Copyright (C) 1995, 1996,1997,1998 Russell King
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <asm/assembler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <asm/unwind.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 		.text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /* Prototype: unsigned long arm_clear_user(void *addr, size_t sz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * Purpose  : clear some user memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * Params   : addr - user memory address to clear
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  *          : sz   - number of bytes to clear
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * Returns  : number of bytes NOT cleared
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) ENTRY(__clear_user_std)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) WEAK(arm_clear_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) UNWIND(.fnstart)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) UNWIND(.save {r1, lr})
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		stmfd	sp!, {r1, lr}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		mov	r2, #0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		cmp	r1, #4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		blt	2f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		ands	ip, r0, #3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		beq	1f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		cmp	ip, #2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		strusr	r2, r0, 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		strusr	r2, r0, 1, le
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		strusr	r2, r0, 1, lt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		rsb	ip, ip, #4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		sub	r1, r1, ip		@  7  6  5  4  3  2  1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 1:		subs	r1, r1, #8		@ -1 -2 -3 -4 -5 -6 -7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		strusr	r2, r0, 4, pl, rept=2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		bpl	1b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		adds	r1, r1, #4		@  3  2  1  0 -1 -2 -3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		strusr	r2, r0, 4, pl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 2:		tst	r1, #2			@ 1x 1x 0x 0x 1x 1x 0x
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		strusr	r2, r0, 1, ne, rept=2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		tst	r1, #1			@ x1 x0 x1 x0 x1 x0 x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		it	ne			@ explicit IT needed for the label
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) USER(		strbtne	r2, [r0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		mov	r0, #0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		ldmfd	sp!, {r1, pc}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) UNWIND(.fnend)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) ENDPROC(arm_clear_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) ENDPROC(__clear_user_std)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		.pushsection .text.fixup,"ax"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		.align	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 9001:		ldmfd	sp!, {r0, pc}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		.popsection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)