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Subject: 
RE: RCX "locking up" when trying to use dll
Newsgroups: 
lugnet.robotics.rcx.legos
Date: 
Tue, 11 Jan 2000 20:31:26 GMT
Viewed: 
1426 times
  
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...>

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 debugger and the high-level C code was not
doing its thing properly, so I at least had a clue of where to look!

What prompted you to look at memcpy? I'm curious because I like detective
stories related to embedded systems...

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 station?
------------------------------------------------------
Reply to:      rhempel at bmts dot com
------------------------------------------------------



Message has 1 Reply:
  Re: RCX "locking up" when trying to use dll
 
(...) 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 (...) (25 years ago, 11-Jan-00, to lugnet.robotics.rcx.legos)

Message is in Reply To:
  Re: RCX "locking up" when trying to use dll
 
(...) 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: 00000000 <_memcpy>: 0: 0d 13 mov.w r1,r3 2: 09 23 add.w r2,r3 4: 1d 13 cmp.w r1,r3 6: 47 00 beq .0 (8) 8: 6c 1a mov.b @r1+,r2l (...) (25 years ago, 11-Jan-00, to lugnet.robotics.rcx.legos)

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