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734c3ce3bd
Older m68k-linux compilers will include pre-defined symbols that confuse what processor it is being targeted for. For example gcc-4.1.2 will pre-define __mc68020__ even if you specify the target processor as -m68000 on the gcc command line. Newer versions of gcc have this corrected. In a few places the m68k code uses defined(__mc68020__) for optimizations that include instructions that are specific to the CPU 68020 and above. When compiling with older compilers this will be true even when we have selected to compile for the older 68000 processors. Switch to using the kernel processor defines, CONFIG_M68020 and friends. Signed-off-by: Greg Ungerer <gerg@uclinux.org>
80 lines
1.5 KiB
C
80 lines
1.5 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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#include <linux/module.h>
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#include <linux/string.h>
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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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#if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
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for (; temp; temp--)
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*lto++ = *lfrom++;
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#else
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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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#endif
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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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