Subject:
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Re: RCX "locking up" when trying to use dll
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Tue, 11 Jan 2000 22:04:20 GMT
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Viewed:
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1465 times
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In lugnet.robotics.rcx.legos, Ralph Hempel writes:
> Ben Jackson wrote:
>
> > It's actually in the library. I just found it. Here is a disassembly of a
> > correct memcpy.o, as built by egcs-1.1.2:
>
> <Snipped disassembly showing exactly what the bug is...>
>
> What prompted you to look at memcpy? I'm curious because I like detective
> stories related to embedded systems...
I built the H8/300 binutils-2.9.1 and gcc-2.95.2 and compiled the legOS kernel
and it was locking up when downloading programs. People here said get
egcs-1.1.2 -- it works! So I built egcs-1.1.2 and cd'd to legOS/boot, make
clean/make and the result still crashed. If it wasn't the kernel it had to be
the libraries, so I cd'd to legOS/lib, rebuilt that, then relinked the kernel
and that worked. The only interesting library is "libc" (the others are math
stubs). I built it with both compilers, disassembled all of the objects and
started looking at diffs. memcpy was actually first alphabetically so I found
it when I compared the first two .s files.
--Ben
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Message has 1 Reply:
 | | RE: RCX "locking up" when trying to use dll
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| (...) Great story! When doing tedious diff compares, I usually find it in the last pair of files :-) Cheers, Ralph Hempel - P.Eng ---...--- The train stops at the train station, The bus stops at the bus station, So why am I sitting at a work (...) (25 years ago, 11-Jan-00, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | RE: RCX "locking up" when trying to use dll
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| (...) <Snipped disassembly showing exactly what the bug is...> WOW! Good catch Ben! I have recently been looking through some disassembly on a totally unrelated topic and have found a bug in an unnamed commercial compiler. But of course I had a (...) (25 years ago, 11-Jan-00, to lugnet.robotics.rcx.legos)
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