71 lines
1.5 KiB
ArmAsm
71 lines
1.5 KiB
ArmAsm
/*
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* File: arch/blackfin/lib/memchr.S
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* Based on:
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* Author:
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*
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* Created:
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* Description:
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/linkage.h>
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/* void *memchr(const void *s, int c, size_t n);
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* R0 = address (s)
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* R1 = sought byte (c)
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* R2 = count (n)
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*
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* Returns pointer to located character.
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*/
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.text
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.align 2
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ENTRY(_memchr)
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P0 = R0; /* P0 = address */
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P2 = R2; /* P2 = count */
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R1 = R1.B(Z);
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CC = R2 == 0;
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IF CC JUMP .Lfailed;
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.Lbytes:
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LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2;
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.Lbyte_loop_s:
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R3 = B[P0++](Z);
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CC = R3 == R1;
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IF CC JUMP .Lfound;
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.Lbyte_loop_e:
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NOP;
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.Lfailed:
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R0=0;
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RTS;
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.Lfound:
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R0 = P0;
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R0 += -1;
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RTS;
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ENDPROC(_memchr)
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