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| /*
| * String handling functions for PowerPC.
| *
| * Copyright (C) 1996 Paul Mackerras.
| *
| * SPDX-License-Identifier: GPL-2.0+
| */
| #include <ppc_asm.tmpl>
| #include <linux/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 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
|
|
