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m68k: fix memcpy to unmatched/unaligned source and dest on 68000

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The original 68000 processors cannot copy 16bit or larger quantities from
odd addresses. All newer members of the 68k family (including ColdFire)
can do this.

In the current memcpy implementation after trying to align the destination
address to a 16bit boundary if we end up with an odd source address we go
off and try to copy multi-byte quantities from it. This will trap on the
68000.

The only solution if we end with an odd source address is to byte wise
copy the whole memcpy region. We only need to do this if we are supporting
original 68000 processors.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Greg Ungerer 2011-08-05 14:41:29 +10:00
parent 899e3ee404
commit f230e80b42
1 changed files with 9 additions and 0 deletions
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9
arch/m68k/lib/memcpy.c
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@ -22,6 +22,15 @@ void *memcpy(void *to, const void *from, size_t n)
from = cfrom;
n--;
}
#if defined(CONFIG_M68000)
if ((long)from & 1) {
char *cto = to;
const char *cfrom = from;
for (; n; n--)
*cto++ = *cfrom++;
return xto;
}
#endif
if (n > 2 && (long)to & 2) {
short *sto = to;
const short *sfrom = from;