powerpc/boot/string.S

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
13 	addi	r5,r3,-1
14 	addi	r4,r4,-1
26 	addi	r6,r3,-1
27 	addi	r4,r4,-1
36 	addi	r5,r3,-1
37 	addi	r4,r4,-1
41 	addi	r5,r5,-1
50 	addi	r3,r3,-1
61 	addi	r5,r3,-1
62 	addi	r4,r4,-1
74 	addi	r5,r3,-1
75 	addi	r4,r4,-1
86 	addi	r4,r3,-1
97 	addi	r6,r3,-4
98 	cmplwi	0,r5,4
100 	stwu	r4,4(r6)
102 	andi.	r0,r6,3
105 	rlwinm	r0,r5,32-2,2,31
108 1:	stwu	r4,4(r6)
110 6:	andi.	r5,r5,3
114 	addi	r6,r6,3
127 	rlwinm.	r7,r5,32-3,3,31		/* r7 = r5 >> 3 */
128 	addi	r6,r3,-4
129 	addi	r4,r4,-4
130 	beq	3f			/* if less than 8 bytes to do */
131 	andi.	r0,r6,3			/* get dest word aligned */
134 	andi.	r0,r4,3			/* check src word aligned too */
135 	bne	3f
136 1:	lwz	r7,4(r4)
138 	stw	r7,4(r6)
142 2:	cmplwi	0,r5,4
143 	blt	3f
144 	lwzu	r0,4(r4)
145 	addi	r5,r5,-4
146 	stwu	r0,4(r6)
147 3:	cmpwi	0,r5,0
150 	addi	r4,r4,3
151 	addi	r6,r6,3
152 4:	lbzu	r0,1(r4)
154 	bdnz	4b
156 5:	subfic	r0,r0,4
159 	andi.	r7,r7,3			/* will source be word-aligned too? */
160 	ble	cr1,3b
161 	bne	3b			/* do byte-by-byte if not */
163 6:	lbz	r7,4(r4)
165 	stb	r7,4(r6)
169 	rlwinm.	r7,r5,32-3,3,31
176 	rlwinm.	r7,r5,32-3,3,31		/* r7 = r5 >> 3 */
179 	beq	3f
180 	andi.	r0,r6,3
183 	andi.	r0,r4,3
184 	bne	3f
185 1:	lwz	r7,-4(r4)
186 	lwzu	r8,-8(r4)
187 	stw	r7,-4(r6)
188 	stwu	r8,-8(r6)
191 2:	cmplwi	0,r5,4
192 	blt	3f
193 	lwzu	r0,-4(r4)
194 	subi	r5,r5,4
195 	stwu	r0,-4(r6)
196 3:	cmpwi	0,r5,0
199 4:	lbzu	r0,-1(r4)
200 	stbu	r0,-1(r6)
201 	bdnz	4b
205 	andi.	r7,r7,3
206 	ble	cr1,3b
207 	bne	3b
209 6:	lbzu	r7,-1(r4)
210 	stbu	r7,-1(r6)
213 	rlwinm.	r7,r5,32-3,3,31
223 	addi	r3,r3,-1
236 	addi	r6,r3,-1
237 	addi	r4,r4,-1
254 	addi	4,4,0x1f	/* len = (len + 0x1f) / 0x20 */
255 	rlwinm.	4,4,27,5,31
256 	mtctr	4
258 1:	dcbf	0,3
259 	icbi	0,3
260 	addi	3,3,0x20