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