![Roman Zippel](/assets/img/avatar_default.png)
- cleanup asm of string functions - deinline strncat()/strncmp() - provide non-inlined strcpy() Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
251 lines
4.3 KiB
C
251 lines
4.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#define __IN_STRING_C
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#include <linux/module.h>
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#include <linux/string.h>
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char *strcpy(char *dest, const char *src)
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{
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return __kernel_strcpy(dest, src);
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}
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EXPORT_SYMBOL(strcpy);
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void *memset(void *s, int c, size_t count)
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{
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void *xs = s;
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size_t temp, temp1;
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if (!count)
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return xs;
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c &= 0xff;
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c |= c << 8;
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c |= c << 16;
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if ((long)s & 1) {
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char *cs = s;
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*cs++ = c;
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s = cs;
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count--;
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}
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if (count > 2 && (long)s & 2) {
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short *ss = s;
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*ss++ = c;
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s = ss;
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count -= 2;
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}
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temp = count >> 2;
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if (temp) {
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long *ls = s;
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asm volatile (
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" movel %1,%2\n"
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" andw #7,%2\n"
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" lsrl #3,%1\n"
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" negw %2\n"
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" jmp %%pc@(2f,%2:w:2)\n"
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"1: movel %3,%0@+\n"
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" movel %3,%0@+\n"
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" movel %3,%0@+\n"
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" movel %3,%0@+\n"
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" movel %3,%0@+\n"
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" movel %3,%0@+\n"
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" movel %3,%0@+\n"
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" movel %3,%0@+\n"
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"2: dbra %1,1b\n"
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" clrw %1\n"
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" subql #1,%1\n"
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" jpl 1b"
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: "=a" (ls), "=d" (temp), "=&d" (temp1)
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: "d" (c), "0" (ls), "1" (temp));
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s = ls;
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}
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if (count & 2) {
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short *ss = s;
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*ss++ = c;
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s = ss;
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}
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if (count & 1) {
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char *cs = s;
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*cs = c;
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}
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return xs;
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}
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EXPORT_SYMBOL(memset);
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void *memcpy(void *to, const void *from, size_t n)
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{
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void *xto = to;
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size_t temp, temp1;
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if (!n)
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return xto;
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if ((long)to & 1) {
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char *cto = to;
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const char *cfrom = from;
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*cto++ = *cfrom++;
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to = cto;
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from = cfrom;
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n--;
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}
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if (n > 2 && (long)to & 2) {
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short *sto = to;
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const short *sfrom = from;
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*sto++ = *sfrom++;
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to = sto;
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from = sfrom;
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n -= 2;
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}
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temp = n >> 2;
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if (temp) {
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long *lto = to;
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const long *lfrom = from;
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asm volatile (
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" movel %2,%3\n"
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" andw #7,%3\n"
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" lsrl #3,%2\n"
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" negw %3\n"
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" jmp %%pc@(1f,%3:w:2)\n"
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"4: movel %0@+,%1@+\n"
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" movel %0@+,%1@+\n"
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" movel %0@+,%1@+\n"
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" movel %0@+,%1@+\n"
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" movel %0@+,%1@+\n"
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" movel %0@+,%1@+\n"
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" movel %0@+,%1@+\n"
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" movel %0@+,%1@+\n"
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"1: dbra %2,4b\n"
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" clrw %2\n"
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" subql #1,%2\n"
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" jpl 4b"
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: "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
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: "0" (lfrom), "1" (lto), "2" (temp));
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to = lto;
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from = lfrom;
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}
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if (n & 2) {
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short *sto = to;
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const short *sfrom = from;
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*sto++ = *sfrom++;
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to = sto;
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from = sfrom;
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}
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if (n & 1) {
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char *cto = to;
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const char *cfrom = from;
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*cto = *cfrom;
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}
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return xto;
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}
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EXPORT_SYMBOL(memcpy);
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void *memmove(void *dest, const void *src, size_t n)
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{
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void *xdest = dest;
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size_t temp;
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if (!n)
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return xdest;
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if (dest < src) {
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if ((long)dest & 1) {
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char *cdest = dest;
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const char *csrc = src;
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*cdest++ = *csrc++;
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dest = cdest;
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src = csrc;
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n--;
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}
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if (n > 2 && (long)dest & 2) {
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short *sdest = dest;
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const short *ssrc = src;
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*sdest++ = *ssrc++;
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dest = sdest;
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src = ssrc;
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n -= 2;
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}
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temp = n >> 2;
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if (temp) {
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long *ldest = dest;
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const long *lsrc = src;
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temp--;
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do
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*ldest++ = *lsrc++;
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while (temp--);
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dest = ldest;
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src = lsrc;
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}
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if (n & 2) {
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short *sdest = dest;
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const short *ssrc = src;
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*sdest++ = *ssrc++;
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dest = sdest;
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src = ssrc;
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}
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if (n & 1) {
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char *cdest = dest;
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const char *csrc = src;
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*cdest = *csrc;
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}
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} else {
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dest = (char *)dest + n;
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src = (const char *)src + n;
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if ((long)dest & 1) {
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char *cdest = dest;
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const char *csrc = src;
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*--cdest = *--csrc;
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dest = cdest;
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src = csrc;
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n--;
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}
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if (n > 2 && (long)dest & 2) {
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short *sdest = dest;
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const short *ssrc = src;
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*--sdest = *--ssrc;
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dest = sdest;
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src = ssrc;
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n -= 2;
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}
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temp = n >> 2;
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if (temp) {
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long *ldest = dest;
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const long *lsrc = src;
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temp--;
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do
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*--ldest = *--lsrc;
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while (temp--);
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dest = ldest;
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src = lsrc;
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}
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if (n & 2) {
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short *sdest = dest;
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const short *ssrc = src;
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*--sdest = *--ssrc;
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dest = sdest;
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src = ssrc;
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}
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if (n & 1) {
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char *cdest = dest;
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const char *csrc = src;
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*--cdest = *--csrc;
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}
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}
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return xdest;
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}
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EXPORT_SYMBOL(memmove);
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int memcmp(const void *cs, const void *ct, size_t count)
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{
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const unsigned char *su1, *su2;
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for (su1 = cs, su2 = ct; count > 0; ++su1, ++su2, count--)
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if (*su1 != *su2)
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return *su1 < *su2 ? -1 : +1;
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return 0;
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}
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EXPORT_SYMBOL(memcmp);
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