void remove_lmf_breakpoint()
{
if (lmf_breakpoint == null)
return;
/*
* We reused an already existing single-stepping breakpoint at the requested location.
*/
if (lmf_breakpoint.Breakpoint == lmf_breakpoint.StolenBreakpoint)
return;
inferior.RemoveBreakpoint (lmf_breakpoint.Breakpoint.ID);
/*
* We stole the single-stepping breakpoint -> restore it here.
*/
if (lmf_breakpoint.StolenBreakpoint != null) {
int dr_index;
TargetAddress address = lmf_breakpoint.StolenBreakpoint.Address;
int id = inferior.InsertHardwareBreakpoint (address, true, out dr_index);
temp_breakpoint = new TemporaryBreakpointData (id, address);
Report.Debug (DebugFlags.SSE, "{0} restored stolen breakpoint: {1}", this, temp_breakpoint);
}
lmf_breakpoint = null;
}
void insert_lmf_breakpoint(TargetAddress lmf_address)
{
lmf_breakpoint = new LMFBreakpointData (lmf_address);
/*
* Insert a breakpoint on the last managed frame (LMF). We use a hardware breakpoint for this
* since the JIT might inspect / modify the callsite and we don't know whether we're at a safe
* spot right now.
*
* If we already have a single-stepping breakpoint, we "steal" it here, so we only use one single
* hardware register internally in the SSE.
*
*/
if (temp_breakpoint != null) {
Report.Debug (DebugFlags.SSE, "{0} stealing temporary breakpoint {1} at {2} -> lmf breakpoint at {2}.",
temp_breakpoint.ID, temp_breakpoint.Address, lmf_address);
lmf_breakpoint.StolenBreakpoint = temp_breakpoint;
temp_breakpoint = null;
/*
* The breakpoint is already at the requested location -> keep and reuse it.
*/
if (lmf_address == temp_breakpoint.Address) {
lmf_breakpoint.Breakpoint = lmf_breakpoint.StolenBreakpoint;
return;
}
inferior.RemoveBreakpoint (lmf_breakpoint.StolenBreakpoint.ID);
}
/*
* The SSE's internal hardware breakpoint register is now free.
*/
int dr_index;
int id = inferior.InsertHardwareBreakpoint (lmf_address, true, out dr_index);
Report.Debug (DebugFlags.SSE, "{0} inserted lmf breakpoint: {1} {2} {3}", this, lmf_address, id, dr_index);
lmf_breakpoint.Breakpoint = new TemporaryBreakpointData (id, lmf_address);
}
