Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) ;; SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) ;;  Copyright 2010  Free Software Foundation, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) ;;  Contributed by Bernd Schmidt <bernds@codesourcery.com>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 	;; ABI considerations for the divide functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	;; The following registers are call-used:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	;; __c6xabi_divi A0,A1,A2,A4,A6,B0,B1,B2,B4,B5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	;; __c6xabi_divu A0,A1,A2,A4,A6,B0,B1,B2,B4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	;; __c6xabi_remi A1,A2,A4,A5,A6,B0,B1,B2,B4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	;; __c6xabi_remu A1,A4,A5,A7,B0,B1,B2,B4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	;; In our implementation, divu and remu are leaf functions,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	;; while both divi and remi call into divu.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	;; A0 is not clobbered by any of the functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	;; divu does not clobber B2 either, which is taken advantage of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	;; in remi.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	;; divi uses B5 to hold the original return address during
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	;; the call to divu.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	;; remi uses B2 and A5 to hold the input values during the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	;; call to divu.  It stores B3 in on the stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	.text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) ENTRY(__c6xabi_remu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	;; The ABI seems designed to prevent these functions calling each other,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	;; so we duplicate most of the divsi3 code here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	 mv	.s2x	A4, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	 lmbd	.l2	1, B4, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) || [!B1] b	.s2	B3	; RETURN A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) || [!B1] mvk	.d2	1, B4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	 mv	.l1x	B1, A7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) ||	 shl	.s2	B4, B1, B4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	 cmpltu	.l1x	A4, B4, A1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)    [!A1] sub	.l1x	A4, B4, A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	 shru	.s2	B4, 1, B4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) _remu_loop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	 cmpgt	.l2	B1, 7, B0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) || [B1]	 subc	.l1x	A4,B4,A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) || [B1]	 add	.s2	-1, B1, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	;; RETURN A may happen here (note: must happen before the next branch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)    [B1]	 subc	.l1x	A4,B4,A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) || [B1]	 add	.s2	-1, B1, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) || [B0]	 b	.s1	_remu_loop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)    [B1]	 subc	.l1x	A4,B4,A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) || [B1]	 add	.s2	-1, B1, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)    [B1]	 subc	.l1x	A4,B4,A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) || [B1]	 add	.s2	-1, B1, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)    [B1]	 subc	.l1x	A4,B4,A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) || [B1]	 add	.s2	-1, B1, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)    [B1]	 subc	.l1x	A4,B4,A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) || [B1]	 add	.s2	-1, B1, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)    [B1]	 subc	.l1x	A4,B4,A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) || [B1]	 add	.s2	-1, B1, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	;; loop backwards branch happens here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	 ret	.s2	B3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)    [B1]	 subc	.l1x	A4,B4,A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) || [B1]	 add	.s2	-1, B1, B1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)    [B1]	 subc	.l1x	A4,B4,A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	 extu	.s1	A4, A7, A4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	 nop	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ENDPROC(__c6xabi_remu)