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From: thomas@uplog.se (Thomas Tornblom)
Newsgroups: comp.sys.m68k
Subject: Re: cast (char *) to (int *) ?
Message-ID: <THOMAS.90Aug8145400@uplog.uplog.se>
Date: 8 Aug 90 12:53:59 GMT
References: <1990Aug7.183302.26585@cbnewsl.att.com>
Sender: thomas@uplog.se (Thomas Tornblom)
Followup-To: comp.sys.m68k
Organization: TeleLOGIC Uppsala AB
Lines: 29
In-Reply-To: rl@cbnewsl.att.com's message of 7 Aug 90 18:33:02 GMT

In article <1990Aug7.183302.26585@cbnewsl.att.com> rl@cbnewsl.att.com (roger.h.levy) writes:


   We have a substantial amount of C code originally targeted to a 68008
   system and now being ported to a 68000 system.  In the past, we have
   casted character pointers to integer pointers in some situations and
   then dereferenced the pointer.  Although this works OK with a 68008,
   it will result in a bus error on our 68000 target if the address of
   the data is odd.  Since we need to correct our code, I was wondering
   whether a tool exists that can identify instances of such statements.
   BTW, I checked my K&R and noted the warning about possible addressing
   errors as a result of this practice.  We realize the error of our
   ways so no further scolding is necessary.

   Roger Levy
   ...!rl@groucho.ATT.COM

Are you sure it worked on the 68008 and not on the 68000?
As I recall both the 68008 and the 68000 will generate an address error
when trying to access anything wider than a byte on an odd address.
I checked the 1983 "16-bit microprocessors data manual" from Moto and
it says that the 68000 and 68008 have equal programmer models.

Thomas
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