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Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	1	/*
				2	* String handling functions for PowerPC.
				3	*
				4	* Copyright (C) 1996 Paul Mackerras.
				5	*
				6	* This program is free software; you can redistribute it and/or
				7	* modify it under the terms of the GNU General Public License
				8	* as published by the Free Software Foundation; either version
				9	* 2 of the License, or (at your option) any later version.
				10	*/
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	11	#include <asm/processor.h>
				12	#include <asm/errno.h>
				13	#include <asm/ppc_asm.h>
Al Viro	9445aa1	2016-01-13 23:33:46 -0500	[diff] [blame]	14	#include <asm/export.h>
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	15
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	16	.section __ex_table,"a"
Michael Ellerman	76bfdcf	2008-07-17 17:17:52 +1000	[diff] [blame]	17	PPC_LONG_ALIGN
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	18	.text
				19
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	20	/* This clears out any unused part of the destination buffer,
				21	just as the libc version does. -- paulus */
				22	_GLOBAL(strncpy)
Andreas Schwab	ca5d067	2010-05-18 08:15:21 +0000	[diff] [blame]	23	PPC_LCMPI 0,r5,0
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	24	beqlr
				25	mtctr r5
				26	addi r6,r3,-1
				27	addi r4,r4,-1
Anton Blanchard	87a156f	2016-05-26 08:39:55 +1000	[diff] [blame]	28	.balign 16
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	29	1: lbzu r0,1(r4)
				30	cmpwi 0,r0,0
				31	stbu r0,1(r6)
				32	bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
				33	bnelr /* if we didn't hit a null char, we're done */
				34	mfctr r5
Andreas Schwab	ca5d067	2010-05-18 08:15:21 +0000	[diff] [blame]	35	PPC_LCMPI 0,r5,0 /* any space left in destination buffer? */
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	36	beqlr /* we know r0 == 0 here */
				37	2: stbu r0,1(r6) /* clear it out if so */
				38	bdnz 2b
				39	blr
Al Viro	9445aa1	2016-01-13 23:33:46 -0500	[diff] [blame]	40	EXPORT_SYMBOL(strncpy)
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	41
Steven Rostedt	0119536	2008-03-01 03:04:57 +1100	[diff] [blame]	42	_GLOBAL(strncmp)
Andreas Schwab	ca5d067	2010-05-18 08:15:21 +0000	[diff] [blame]	43	PPC_LCMPI 0,r5,0
				44	beq- 2f
Steven Rostedt	0119536	2008-03-01 03:04:57 +1100	[diff] [blame]	45	mtctr r5
				46	addi r5,r3,-1
				47	addi r4,r4,-1
Anton Blanchard	87a156f	2016-05-26 08:39:55 +1000	[diff] [blame]	48	.balign 16
Steven Rostedt	0119536	2008-03-01 03:04:57 +1100	[diff] [blame]	49	1: lbzu r3,1(r5)
				50	cmpwi 1,r3,0
				51	lbzu r0,1(r4)
				52	subf. r3,r0,r3
				53	beqlr 1
				54	bdnzt eq,1b
				55	blr
Jeff Mahoney	637a990	2010-03-17 10:55:51 +0000	[diff] [blame]	56	2: li r3,0
				57	blr
Al Viro	9445aa1	2016-01-13 23:33:46 -0500	[diff] [blame]	58	EXPORT_SYMBOL(strncmp)
Steven Rostedt	0119536	2008-03-01 03:04:57 +1100	[diff] [blame]	59
Anton Blanchard	15c2d45	2015-01-21 12:27:38 +1100	[diff] [blame]	60	#ifdef CONFIG_PPC32
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	61	_GLOBAL(memcmp)
Andreas Schwab	ca5d067	2010-05-18 08:15:21 +0000	[diff] [blame]	62	PPC_LCMPI 0,r5,0
				63	beq- 2f
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	64	mtctr r5
				65	addi r6,r3,-1
				66	addi r4,r4,-1
				67	1: lbzu r3,1(r6)
				68	lbzu r0,1(r4)
				69	subf. r3,r0,r3
				70	bdnzt 2,1b
				71	blr
				72	2: li r3,0
				73	blr
Al Viro	9445aa1	2016-01-13 23:33:46 -0500	[diff] [blame]	74	EXPORT_SYMBOL(memcmp)
Anton Blanchard	15c2d45	2015-01-21 12:27:38 +1100	[diff] [blame]	75	#endif
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	76
				77	_GLOBAL(memchr)
Andreas Schwab	ca5d067	2010-05-18 08:15:21 +0000	[diff] [blame]	78	PPC_LCMPI 0,r5,0
				79	beq- 2f
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	80	mtctr r5
				81	addi r3,r3,-1
Anton Blanchard	87a156f	2016-05-26 08:39:55 +1000	[diff] [blame]	82	.balign 16
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	83	1: lbzu r0,1(r3)
				84	cmpw 0,r0,r4
				85	bdnzf 2,1b
				86	beqlr
				87	2: li r3,0
				88	blr
Al Viro	9445aa1	2016-01-13 23:33:46 -0500	[diff] [blame]	89	EXPORT_SYMBOL(memchr)
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	90
Anton Blanchard	17968fb	2012-05-27 19:54:03 +0000	[diff] [blame]	91	#ifdef CONFIG_PPC32
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	92	_GLOBAL(__clear_user)
				93	addi r6,r3,-4
				94	li r3,0
				95	li r5,0
				96	cmplwi 0,r4,4
				97	blt 7f
				98	/* clear a single word */
				99	11: stwu r5,4(r6)
				100	beqlr
				101	/* clear word sized chunks */
				102	andi. r0,r6,3
				103	add r4,r0,r4
				104	subf r6,r0,r6
				105	srwi r0,r4,2
				106	andi. r4,r4,3
				107	mtctr r0
				108	bdz 7f
				109	1: stwu r5,4(r6)
				110	bdnz 1b
				111	/* clear byte sized chunks */
				112	7: cmpwi 0,r4,0
				113	beqlr
				114	mtctr r4
				115	addi r6,r6,3
				116	8: stbu r5,1(r6)
				117	bdnz 8b
				118	blr
				119	90: mr r3,r4
				120	blr
				121	91: mfctr r3
				122	slwi r3,r3,2
				123	add r3,r3,r4
				124	blr
				125	92: mfctr r3
				126	blr
				127
				128	.section __ex_table,"a"
Michael Ellerman	76bfdcf	2008-07-17 17:17:52 +1000	[diff] [blame]	129	PPC_LONG 11b,90b
				130	PPC_LONG 1b,91b
				131	PPC_LONG 8b,92b
Paul Mackerras	14cf11a	2005-09-26 16:04:21 +1000	[diff] [blame]	132	.text
Al Viro	9445aa1	2016-01-13 23:33:46 -0500	[diff] [blame]	133	EXPORT_SYMBOL(__clear_user)
Anton Blanchard	17968fb	2012-05-27 19:54:03 +0000	[diff] [blame]	134	#endif