diff options
Diffstat (limited to 'arch/powerpc/lib/string.S')
| -rw-r--r-- | arch/powerpc/lib/string.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/powerpc/lib/string.S b/arch/powerpc/lib/string.S new file mode 100644 index 0000000000..daa72061dc --- /dev/null +++ b/arch/powerpc/lib/string.S @@ -0,0 +1,65 @@ +/* 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) |