Hi, I'm meeting the same issue again and trying to use "nm". How do I let "nm" display the symbols only in bss section and order by their address in non-decreasing fashion? This way, I can see what symbols are near the one I'm tracking. Thanks.
On Fri, Aug 20, 2010 at 6:16 PM, Philip Levis <[email protected]> wrote: > > On Aug 20, 2010, at 7:22 AM, Xiaohui Liu wrote: > > > Actually, I'm trying to change 4 bit link estimation (4bitle) to estimate > some link delay related information. At the beginning, 4bitle is working > fine. However, after I add the blue fields (nothing else), 4bitle seems to > malfunction. Hope this helps clarify my question. > > You need to be more precise. "Malfunction" is not helpful when it comes to > debugging. > > Sorry to say this, but you're going about debugging this all wrong. You're > confusing a symptom (when you change the structure) with a diagnosis (what's > going wrong in the program). This kind of debugging is just throwing darts > in the dark: it doesn't get you to the bottom of the problem. > > There are two possibilities: > > 1) More likely: there is a memory access bug in your code. When you change > the structure definition, the compiler places the differently sized > structure in a different place in memory. E.g., next to the memory with the > bug. One way to help diagnose this is to examine what variables are near the > structure in the two different executables (nm, objdump, etc.). > > 2) Much less likely: there is a compiler bug on access to the structure. > The way to diagnose this is to look at the generated assembly. > > Effective diagnosis requires, in both cases, a clear understanding of what > the memory access error is and how it manifests. > > Regardless, chances are this bug has nothing to do with nesC, and is really > just a low-level C bug. That is, unless nesc1 is doing something weird (very > unlikely). You can check this by looking at app.c. > > Phil -- -Xiaohui Liu
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