Eric Lee / smarc-uboot

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tools/updater/ppcstring.S 2.96 KB
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c7de829c7   wdenk   * Patch by Thomas... 
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  /*
   * 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 <ppc_asm.tmpl>
  #include <asm/errno.h>
  
  	.globl	strcpy
  strcpy:
  	addi	r5,r3,-1
  	addi	r4,r4,-1
  1:	lbzu	r0,1(r4)
  	cmpwi	0,r0,0
  	stbu	r0,1(r5)
  	bne	1b
  	blr
  
  	.globl	strncpy
  strncpy:
  	cmpwi	0,r5,0
  	beqlr
  	mtctr	r5
  	addi	r6,r3,-1
  	addi	r4,r4,-1
  1:	lbzu	r0,1(r4)
  	cmpwi	0,r0,0
  	stbu	r0,1(r6)
  	bdnzf	2,1b		/* dec ctr, branch if ctr != 0 && !cr0.eq */
  	blr
  
  	.globl	strcat
  strcat:
  	addi	r5,r3,-1
  	addi	r4,r4,-1
  1:	lbzu	r0,1(r5)
  	cmpwi	0,r0,0
  	bne	1b
  	addi	r5,r5,-1
  1:	lbzu	r0,1(r4)
  	cmpwi	0,r0,0
  	stbu	r0,1(r5)
  	bne	1b
  	blr
  
  	.globl	strcmp
  strcmp:
  	addi	r5,r3,-1
  	addi	r4,r4,-1
  1:	lbzu	r3,1(r5)
  	cmpwi	1,r3,0
  	lbzu	r0,1(r4)
  	subf.	r3,r0,r3
  	beqlr	1
  	beq	1b
  	blr
  
  	.globl	strlen
  strlen:
  	addi	r4,r3,-1
  1:	lbzu	r0,1(r4)
  	cmpwi	0,r0,0
  	bne	1b
  	subf	r3,r3,r4
  	blr
  
  	.globl	memset
  memset:
  	rlwimi	r4,r4,8,16,23
  	rlwimi	r4,r4,16,0,15
  	addi	r6,r3,-4
  	cmplwi	0,r5,4
  	blt	7f
  	stwu	r4,4(r6)
  	beqlr
  	andi.	r0,r6,3
  	add	r5,r0,r5
  	subf	r6,r0,r6
  	rlwinm	r0,r5,32-2,2,31
  	mtctr	r0
  	bdz	6f
  1:	stwu	r4,4(r6)
  	bdnz	1b
  6:	andi.	r5,r5,3
  7:	cmpwi	0,r5,0
  	beqlr
  	mtctr	r5
  	addi	r6,r6,3
  8:	stbu	r4,1(r6)
  	bdnz	8b
  	blr
  
  	.globl	bcopy
  bcopy:
  	mr	r6,r3
  	mr	r3,r4
  	mr	r4,r6
  	b	memcpy
  
  	.globl	memmove
  memmove:
  	cmplw	0,r3,r4
  	bgt	backwards_memcpy
  	/* fall through */
  
  	.globl	memcpy
  memcpy:
  	rlwinm.	r7,r5,32-3,3,31		/* r0 = r5 >> 3 */
  	addi	r6,r3,-4
  	addi	r4,r4,-4
  	beq	2f			/* if less than 8 bytes to do */
  	andi.	r0,r6,3			/* get dest word aligned */
  	mtctr	r7
  	bne	5f
  1:	lwz	r7,4(r4)
  	lwzu	r8,8(r4)
  	stw	r7,4(r6)
  	stwu	r8,8(r6)
  	bdnz	1b
  	andi.	r5,r5,7
  2:	cmplwi	0,r5,4
  	blt	3f
  	lwzu	r0,4(r4)
  	addi	r5,r5,-4
  	stwu	r0,4(r6)
  3:	cmpwi	0,r5,0
  	beqlr
  	mtctr	r5
  	addi	r4,r4,3
  	addi	r6,r6,3
  4:	lbzu	r0,1(r4)
  	stbu	r0,1(r6)
  	bdnz	4b
  	blr
  5:	subfic	r0,r0,4
  	mtctr	r0
  6:	lbz	r7,4(r4)
  	addi	r4,r4,1
  	stb	r7,4(r6)
  	addi	r6,r6,1
  	bdnz	6b
  	subf	r5,r0,r5
  	rlwinm.	r7,r5,32-3,3,31
  	beq	2b
  	mtctr	r7
  	b	1b
  
  	.globl	backwards_memcpy
  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	5f
  1:	lwz	r7,-4(r4)
  	lwzu	r8,-8(r4)
  	stw	r7,-4(r6)
  	stwu	r8,-8(r6)
  	bdnz	1b
  	andi.	r5,r5,7
  2:	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	r5
  4:	lbzu	r0,-1(r4)
  	stbu	r0,-1(r6)
  	bdnz	4b
  	blr
  5:	mtctr	r0
  6:	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
  
  	.globl	memcmp
  memcmp:
  	cmpwi	0,r5,0
  	ble-	2f
  	mtctr	r5
  	addi	r6,r3,-1
  	addi	r4,r4,-1
  1:	lbzu	r3,1(r6)
  	lbzu	r0,1(r4)
  	subf.	r3,r0,r3
  	bdnzt	2,1b
  	blr
  2:	li	r3,0
  	blr
  
  	.global	memchr
  memchr:
  	cmpwi	0,r5,0
  	ble-	2f
  	mtctr	r5
  	addi	r3,r3,-1
  1:	lbzu	r0,1(r3)
  	cmpw	0,r0,r4
  	bdnzf	2,1b
  	beqlr
  2:	li	r3,0
  	blr