mirror of https://gitee.com/openkylin/linux.git
parisc: Add assembly implementations for memset, strlen, strcpy, strncpy and strcat
Add performance-optimized versions of some string functions. Signed-off-by: Helge Deller <deller@gmx.de> Tested-by: Sven Schnelle <svens@stackframe.org>
This commit is contained in:
Helge Deller
parent
ec4d396b63
commit
83af58f806
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@ -8,4 +8,19 @@ extern void * memset(void *, int, size_t);
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#define __HAVE_ARCH_MEMCPY
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void * memcpy(void * dest,const void *src,size_t count);
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#define __HAVE_ARCH_STRLEN
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extern size_t strlen(const char *s);
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#define __HAVE_ARCH_STRCPY
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extern char *strcpy(char *dest, const char *src);
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#define __HAVE_ARCH_STRNCPY
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extern char *strncpy(char *dest, const char *src, size_t count);
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#define __HAVE_ARCH_STRCAT
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extern char *strcat(char *dest, const char *src);
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *, int, size_t);
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#endif
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@ -17,6 +17,10 @@
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#include <linux/string.h>
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EXPORT_SYMBOL(memset);
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EXPORT_SYMBOL(strlen);
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EXPORT_SYMBOL(strcpy);
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EXPORT_SYMBOL(strncpy);
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EXPORT_SYMBOL(strcat);
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#include <linux/atomic.h>
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EXPORT_SYMBOL(__xchg8);
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@ -3,7 +3,7 @@
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# Makefile for parisc-specific library files
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#
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lib-y := lusercopy.o bitops.o checksum.o io.o memset.o memcpy.o \
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ucmpdi2.o delay.o
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lib-y := lusercopy.o bitops.o checksum.o io.o memcpy.o \
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ucmpdi2.o delay.o string.o
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obj-y := iomap.o
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@ -1,91 +0,0 @@
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/* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Slight modifications for pa-risc linux - Paul Bame <bame@debian.org> */
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#include <linux/types.h>
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#include <asm/string.h>
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#define OPSIZ (BITS_PER_LONG/8)
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typedef unsigned long op_t;
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void *
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memset (void *dstpp, int sc, size_t len)
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{
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unsigned int c = sc;
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long int dstp = (long int) dstpp;
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if (len >= 8)
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{
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size_t xlen;
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op_t cccc;
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cccc = (unsigned char) c;
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cccc |= cccc << 8;
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cccc |= cccc << 16;
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if (OPSIZ > 4)
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/* Do the shift in two steps to avoid warning if long has 32 bits. */
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cccc |= (cccc << 16) << 16;
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/* There are at least some bytes to set.
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No need to test for LEN == 0 in this alignment loop. */
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while (dstp % OPSIZ != 0)
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{
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((unsigned char *) dstp)[0] = c;
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dstp += 1;
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len -= 1;
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}
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/* Write 8 `op_t' per iteration until less than 8 `op_t' remain. */
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xlen = len / (OPSIZ * 8);
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while (xlen > 0)
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{
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((op_t *) dstp)[0] = cccc;
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((op_t *) dstp)[1] = cccc;
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((op_t *) dstp)[2] = cccc;
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((op_t *) dstp)[3] = cccc;
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((op_t *) dstp)[4] = cccc;
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((op_t *) dstp)[5] = cccc;
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((op_t *) dstp)[6] = cccc;
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((op_t *) dstp)[7] = cccc;
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dstp += 8 * OPSIZ;
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xlen -= 1;
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}
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len %= OPSIZ * 8;
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/* Write 1 `op_t' per iteration until less than OPSIZ bytes remain. */
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xlen = len / OPSIZ;
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while (xlen > 0)
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{
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((op_t *) dstp)[0] = cccc;
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dstp += OPSIZ;
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xlen -= 1;
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}
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len %= OPSIZ;
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}
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/* Write the last few bytes. */
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while (len > 0)
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{
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((unsigned char *) dstp)[0] = c;
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dstp += 1;
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len -= 1;
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}
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return dstpp;
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}
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@ -0,0 +1,136 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* PA-RISC assembly string functions
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*
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* Copyright (C) 2019 Helge Deller <deller@gmx.de>
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*/
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#include <asm/assembly.h>
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#include <linux/linkage.h>
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.section .text.hot
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.level PA_ASM_LEVEL
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t0 = r20
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t1 = r21
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t2 = r22
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ENTRY_CFI(strlen, frame=0,no_calls)
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or,COND(<>) arg0,r0,ret0
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b,l,n .Lstrlen_null_ptr,r0
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depwi 0,31,2,ret0
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cmpb,COND(<>) arg0,ret0,.Lstrlen_not_aligned
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ldw,ma 4(ret0),t0
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cmpib,tr 0,r0,.Lstrlen_loop
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uxor,nbz r0,t0,r0
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.Lstrlen_not_aligned:
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uaddcm arg0,ret0,t1
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shladd t1,3,r0,t1
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mtsar t1
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depwi -1,%sar,32,t0
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uxor,nbz r0,t0,r0
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.Lstrlen_loop:
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b,l,n .Lstrlen_end_loop,r0
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ldw,ma 4(ret0),t0
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cmpib,tr 0,r0,.Lstrlen_loop
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uxor,nbz r0,t0,r0
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.Lstrlen_end_loop:
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extrw,u,<> t0,7,8,r0
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addib,tr,n -3,ret0,.Lstrlen_out
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extrw,u,<> t0,15,8,r0
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addib,tr,n -2,ret0,.Lstrlen_out
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extrw,u,<> t0,23,8,r0
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addi -1,ret0,ret0
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.Lstrlen_out:
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bv r0(rp)
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uaddcm ret0,arg0,ret0
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.Lstrlen_null_ptr:
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bv,n r0(rp)
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ENDPROC_CFI(strlen)
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ENTRY_CFI(strcpy, frame=0,no_calls)
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ldb 0(arg1),t0
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stb t0,0(arg0)
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ldo 0(arg0),ret0
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ldo 1(arg1),t1
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cmpb,= r0,t0,2f
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ldo 1(arg0),t2
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1: ldb 0(t1),arg1
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stb arg1,0(t2)
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ldo 1(t1),t1
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cmpb,<> r0,arg1,1b
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ldo 1(t2),t2
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2: bv,n r0(rp)
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ENDPROC_CFI(strcpy)
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ENTRY_CFI(strncpy, frame=0,no_calls)
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ldb 0(arg1),t0
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stb t0,0(arg0)
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ldo 1(arg1),t1
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ldo 0(arg0),ret0
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cmpb,= r0,t0,2f
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ldo 1(arg0),arg1
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1: ldo -1(arg2),arg2
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cmpb,COND(=),n r0,arg2,2f
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ldb 0(t1),arg0
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stb arg0,0(arg1)
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ldo 1(t1),t1
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cmpb,<> r0,arg0,1b
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ldo 1(arg1),arg1
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2: bv,n r0(rp)
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ENDPROC_CFI(strncpy)
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ENTRY_CFI(strcat, frame=0,no_calls)
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ldb 0(arg0),t0
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cmpb,= t0,r0,2f
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ldo 0(arg0),ret0
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ldo 1(arg0),arg0
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1: ldb 0(arg0),t1
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cmpb,<>,n r0,t1,1b
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ldo 1(arg0),arg0
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2: ldb 0(arg1),t2
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stb t2,0(arg0)
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ldo 1(arg0),arg0
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ldb 0(arg1),t0
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cmpb,<> r0,t0,2b
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ldo 1(arg1),arg1
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bv,n r0(rp)
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ENDPROC_CFI(strcat)
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ENTRY_CFI(memset, frame=0,no_calls)
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copy arg0,ret0
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cmpb,COND(=) r0,arg0,4f
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copy arg0,t2
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cmpb,COND(=) r0,arg2,4f
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ldo -1(arg2),arg3
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subi -1,arg3,t0
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subi 0,t0,t1
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cmpiclr,COND(>=) 0,t1,arg2
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ldo -1(t1),arg2
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extru arg2,31,2,arg0
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2: stb arg1,0(t2)
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ldo 1(t2),t2
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addib,>= -1,arg0,2b
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ldo -1(arg3),arg3
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cmpiclr,COND(<=) 4,arg2,r0
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b,l,n 4f,r0
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#ifdef CONFIG_64BIT
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depd,* r0,63,2,arg2
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#else
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depw r0,31,2,arg2
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#endif
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ldo 1(t2),t2
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3: stb arg1,-1(t2)
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stb arg1,0(t2)
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stb arg1,1(t2)
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stb arg1,2(t2)
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addib,COND(>) -4,arg2,3b
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ldo 4(t2),t2
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4: bv,n r0(rp)
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ENDPROC_CFI(memset)
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.end
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