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| /* SPDX-License-Identifier: GPL-2.0-or-later */
| /*
| * String handling functions for PowerPC.
| *
| * Copyright (C) 1996 Paul Mackerras.
| */
| #include <asm/ppc_asm.h>
| #include <asm/export.h>
| #include <asm/cache.h>
|
| .text
|
| /* 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,-1
| .balign IFETCH_ALIGN_BYTES
| 1: 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
| EXPORT_SYMBOL(strncpy)
|
| _GLOBAL(strncmp)
| PPC_LCMPI 0,r5,0
| beq- 2f
| mtctr r5
| addi r5,r3,-1
| addi r4,r4,-1
| .balign IFETCH_ALIGN_BYTES
| 1: lbzu r3,1(r5)
| cmpwi 1,r3,0
| lbzu r0,1(r4)
| subf. r3,r0,r3
| beqlr 1
| bdnzt eq,1b
| blr
| 2: li r3,0
| blr
| EXPORT_SYMBOL(strncmp)
|
| _GLOBAL(memchr)
| PPC_LCMPI 0,r5,0
| beq- 2f
| mtctr r5
| addi r3,r3,-1
| .balign IFETCH_ALIGN_BYTES
| 1: lbzu r0,1(r3)
| cmpw 0,r0,r4
| bdnzf 2,1b
| beqlr
| 2: li r3,0
| blr
| EXPORT_SYMBOL(memchr)
|
|
