/* * String handling functions for PowerPC. * * Copyright (C) 1996 Paul Mackerras. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */#include <asm/processor.h>#include <asm/errno.h>#include <asm/ppc_asm.h> _GLOBAL(strcpy)	addi	r5,r3,-1	addi	r4,r4,-11:	lbzu	r0,1(r4)	cmpwi	0,r0,0	stbu	r0,1(r5)	bne	1b	blr _GLOBAL(strncpy)	cmpwi	0,r5,0	beqlr	mtctr	r5	addi	r6,r3,-1	addi	r4,r4,-11:	lbzu	r0,1(r4)	cmpwi	0,r0,0	stbu	r0,1(r6)	bdnzf	2,1b		/* dec ctr, branch if ctr != 0 && !cr0.eq */	blr _GLOBAL(strcat)	addi	r5,r3,-1	addi	r4,r4,-11:	lbzu	r0,1(r5)	cmpwi	0,r0,0	bne	1b	addi	r5,r5,-11:	lbzu	r0,1(r4)	cmpwi	0,r0,0	stbu	r0,1(r5)	bne	1b	blr _GLOBAL(strcmp)	addi	r5,r3,-1	addi	r4,r4,-11:	lbzu	r3,1(r5)	cmpwi	1,r3,0	lbzu	r0,1(r4)	subf.	r3,r0,r3	beqlr	1	beq	1b	blr _GLOBAL(strlen)	addi	r4,r3,-11:	lbzu	r0,1(r4)	cmpwi	0,r0,0	bne	1b	subf	r3,r3,r4	blr _GLOBAL(memset)	neg	r0,r3	rlwimi	r4,r4,8,16,23	andi.	r0,r0,7			/* # bytes to be 8-byte aligned */	rlwimi	r4,r4,16,0,15	cmplw	cr1,r5,r0		/* do we get that far? */	rldimi	r4,r4,32,0	mtcrf	1,r0	mr	r6,r3	blt	cr1,8f	beq+	3f			/* if already 8-byte aligned */	subf	r5,r0,r5	bf	31,1f	stb	r4,0(r6)	addi	r6,r6,11:	bf	30,2f	sth	r4,0(r6)	addi	r6,r6,22:	bf	29,3f	stw	r4,0(r6)	addi	r6,r6,43:	srdi.	r0,r5,6	clrldi	r5,r5,58	mtctr	r0	beq	5f4:	std	r4,0(r6)	std	r4,8(r6)	std	r4,16(r6)	std	r4,24(r6)	std	r4,32(r6)	std	r4,40(r6)	std	r4,48(r6)	std	r4,56(r6)	addi	r6,r6,64	bdnz	4b5:	srwi.	r0,r5,3	clrlwi	r5,r5,29	mtcrf	1,r0	beq	8f	bf	29,6f	std	r4,0(r6)	std	r4,8(r6)	std	r4,16(r6)	std	r4,24(r6)	addi	r6,r6,326:	bf	30,7f	std	r4,0(r6)	std	r4,8(r6)	addi	r6,r6,167:	bf	31,8f	std	r4,0(r6)	addi	r6,r6,88:	cmpwi	r5,0	mtcrf	1,r5	beqlr+	bf	29,9f	stw	r4,0(r6)	addi	r6,r6,49:	bf	30,10f	sth	r4,0(r6)	addi	r6,r6,210:	bflr	31	stb	r4,0(r6)	blr _GLOBAL(memmove)	cmplw	0,r3,r4	bgt	.backwards_memcpy	b	.memcpy _GLOBAL(backwards_memcpy)	rlwinm.	r7,r5,32-3,3,31		/* r0 = r5 >> 3 */	add	r6,r3,r5	add	r4,r4,r5	beq	2f	andi.	r0,r6,3	mtctr	r7	bne	5f1:	lwz	r7,-4(r4)	lwzu	r8,-8(r4)	stw	r7,-4(r6)	stwu	r8,-8(r6)	bdnz	1b	andi.	r5,r5,72:	cmplwi	0,r5,4	blt	3f	lwzu	r0,-4(r4)	subi	r5,r5,4	stwu	r0,-4(r6)3:	cmpwi	0,r5,0	beqlr	mtctr	r54:	lbzu	r0,-1(r4)	stbu	r0,-1(r6)	bdnz	4b	blr5:	mtctr	r06:	lbzu	r7,-1(r4)	stbu	r7,-1(r6)	bdnz	6b	subf	r5,r0,r5	rlwinm.	r7,r5,32-3,3,31	beq	2b	mtctr	r7	b	1b	_GLOBAL(memcmp)	cmpwi	0,r5,0	ble-	2f	mtctr	r5	addi	r6,r3,-1	addi	r4,r4,-11:	lbzu	r3,1(r6)	lbzu	r0,1(r4)	subf.	r3,r0,r3	bdnzt	2,1b	blr2:	li	r3,0	blr _GLOBAL(memchr)	cmpwi	0,r5,0	ble-	2f	mtctr	r5	addi	r3,r3,-11:	lbzu	r0,1(r3)	cmpw	0,r0,r4	bdnzf	2,1b	beqlr2:	li	r3,0	blr _GLOBAL(__clear_user)	addi	r6,r3,-4	li	r3,0	li	r5,0	cmplwi	0,r4,4	blt	7f	/* clear a single word */11:	stwu	r5,4(r6)	beqlr	/* clear word sized chunks */	andi.	r0,r6,3	add	r4,r0,r4	subf	r6,r0,r6	srwi	r0,r4,2	andi.	r4,r4,3	mtctr	r0	bdz	7f1:	stwu	r5,4(r6)	bdnz	1b	/* clear byte sized chunks */7:	cmpwi	0,r4,0	beqlr	mtctr	r4	addi	r6,r6,38:	stbu	r5,1(r6)	bdnz	8b	blr90:	mr	r3,r4	blr91:	mfctr	r3	slwi	r3,r3,2	add	r3,r3,r4	blr92:	mfctr	r3	blr 	.section __ex_table,"a"	.align	3	.llong	11b,90b	.llong	1b,91b	.llong	8b,92b	.text /* r3 = dst, r4 = src, r5 = count */_GLOBAL(__strncpy_from_user)	addi	r6,r3,-1	addi	r4,r4,-1	cmpwi	0,r5,0	beq	2f	mtctr	r51:	lbzu	r0,1(r4)	cmpwi	0,r0,0	stbu	r0,1(r6)	bdnzf	2,1b		/* dec ctr, branch if ctr != 0 && !cr0.eq */	beq	3f2:	addi	r6,r6,13:	subf	r3,r3,r6	blr99:	li	r3,-EFAULT	blr 	.section __ex_table,"a"	.align	3	.llong	1b,99b	.text /* r3 = str, r4 = len (> 0) */_GLOBAL(__strnlen_user)	addi	r7,r3,-1	mtctr	r4		/* ctr = len */1:	lbzu	r0,1(r7)	/* get next byte */	cmpwi	0,r0,0	bdnzf	2,1b		/* loop if --ctr != 0 && byte != 0 */	addi	r7,r7,1	subf	r3,r3,r7	/* number of bytes we have looked at */	beqlr			/* return if we found a 0 byte */	cmpw	0,r3,r4		/* did we look at all len bytes? */	blt	99f		/* if not, must have hit top */	addi	r3,r4,1		/* return len + 1 to indicate no null found */	blr99:	li	r3,0		/* bad address, return 0 */	blr 	.section __ex_table,"a"	.align	3	.llong	1b,99b