66 lines
1.2 KiB
ArmAsm
66 lines
1.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* String handling functions for PowerPC.
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*
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* Copyright (C) 1996 Paul Mackerras.
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*/
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#include <linux/export.h>
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#include <asm/ppc_asm.h>
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#include <asm/cache.h>
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.text
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/* This clears out any unused part of the destination buffer,
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just as the libc version does. -- paulus */
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_GLOBAL(strncpy)
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PPC_LCMPI 0,r5,0
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beqlr
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mtctr r5
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addi r6,r3,-1
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addi r4,r4,-1
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.balign IFETCH_ALIGN_BYTES
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1: lbzu r0,1(r4)
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cmpwi 0,r0,0
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stbu r0,1(r6)
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bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
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bnelr /* if we didn't hit a null char, we're done */
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mfctr r5
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PPC_LCMPI 0,r5,0 /* any space left in destination buffer? */
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beqlr /* we know r0 == 0 here */
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2: stbu r0,1(r6) /* clear it out if so */
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bdnz 2b
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blr
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EXPORT_SYMBOL(strncpy)
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_GLOBAL(strncmp)
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PPC_LCMPI 0,r5,0
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beq- 2f
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mtctr r5
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addi r5,r3,-1
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addi r4,r4,-1
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.balign IFETCH_ALIGN_BYTES
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1: lbzu r3,1(r5)
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cmpwi 1,r3,0
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lbzu r0,1(r4)
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subf. r3,r0,r3
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beqlr 1
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bdnzt eq,1b
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blr
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2: li r3,0
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blr
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EXPORT_SYMBOL(strncmp)
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_GLOBAL(memchr)
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PPC_LCMPI 0,r5,0
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beq- 2f
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mtctr r5
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addi r3,r3,-1
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.balign IFETCH_ALIGN_BYTES
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1: lbzu r0,1(r3)
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cmpw 0,r0,r4
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bdnzf 2,1b
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beqlr
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2: li r3,0
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blr
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EXPORT_SYMBOL(memchr)
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