/* * 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> 	.section __ex_table,"a"	PPC_LONG_ALIGN	.text	_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 /* This clears out any unused part of the destination buffer,   just as the libc version does.  -- paulus */_GLOBAL(strncpy)	PPC_LCMPI 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 */	bnelr			/* if we didn't hit a null char, we're done */	mfctr	r5	PPC_LCMPI 0,r5,0	/* any space left in destination buffer? */	beqlr			/* we know r0 == 0 here */2:	stbu	r0,1(r6)	/* clear it out if so */	bdnz	2b	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(strncmp)	PPC_LCMPI 0,r5,0	beq-	2f	mtctr	r5	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	bdnzt	eq,1b	blr2:	li	r3,0	blr _GLOBAL(strlen)	addi	r4,r3,-11:	lbzu	r0,1(r4)	cmpwi	0,r0,0	bne	1b	subf	r3,r3,r4	blr _GLOBAL(memcmp)	PPC_LCMPI 0,r5,0	beq-	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)	PPC_LCMPI 0,r5,0	beq-	2f	mtctr	r5	addi	r3,r3,-11:	lbzu	r0,1(r3)	cmpw	0,r0,r4	bdnzf	2,1b	beqlr2:	li	r3,0	blr #ifdef CONFIG_PPC32_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"	PPC_LONG	11b,90b	PPC_LONG	1b,91b	PPC_LONG	8b,92b	.text#endif