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