Re: [DynInst_API:] Inserting x86 traps before points of interest

[Bill Williams <bill@xxxxxxxxxxx>]

On 10/26/2015 01:00 PM, Yasser Shalabi wrote:
> Thanks for the quick reply bill!
>
> When I try:
>
>      app->insertSnippet(BPatch_breakPointExpr(), instrumentation_points);
>      BPatch_binaryEdit *appBin = dynamic_cast<BPatch_binaryEdit *>(app);
>      appBin->writeFile(newName);
>
> I get an assertion failure:
>
> DyninstAPI-9.0.3/dyninstAPI/src/ast.C:2072: virtual bool
> AstCallNode::initRegisters(codeGen&): Assertion `callee' failed.
>
> Any tips on how to approach?
...what function is it trying to insert a call to? (A call stack from 
gdb should be sufficient.) And what platform are you on?
In any event, a breakpointexpr may well not do the right thing in 
rewriter mode; it's intended for use when Dyninst is serving as a live 
debugger for the process. What's the bigger picture? What do you want to 
accomplish when these traps are hit?
On Mon, Oct 26, 2015 at 11:11 AM, Bill Williams <bill@xxxxxxxxxxx> wrote:
> > On 10/26/2015 10:33 AM, Yasser Shalabi wrote:
> >
> > I want to insert int3 before points of interest.I have collected these
> > points using Dyninst. Any pointers on which parts of the API to instrument
> > these points with int3 instructions?
> >
> > A BPatch_breakpointExpr should do the trick.
> >
> > Thanks!
> > Yasser
> >
> >
> >
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