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Date: Fri, 28 May 2010 15:36:00 -0000
Message-ID: <AANLkTikXtJzwH_0TxMmvCGn0PLM9U0-mxwiKg4tGEd8Q@mail.gmail.com>
Subject: Problem Halting Execution
From: Joseph Altmaier <joseph.altmaier@gmail.com>
To: sid@sources.redhat.com
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I'm writing a SID port, and I can't get it to halt properly.=A0 What is
the functionality of yield()?=A0 It does not seem to stop instruction
flow.=A0 When yield() is called step_insns() will return after the break
at the end of the loop but then it gets called again.=A0 Included is
pseudocode for my step_insns() function.=A0 Any help would be
appreciated.

Thanks!
Joseph Altmaier

void
*processor*_cpu::step_insns ()
{
=A0 bool found;

=A0 while (true)
=A0=A0=A0 {
=A0=A0=A0=A0=A0 get next PC

=A0=A0=A0=A0=A0 for(int u =3D 0; u < 2; u++) {//Two execution units

=A0=A0=A0=A0=A0=A0=A0 Get next instruction for current execution unit

=A0=A0=A0=A0 =A0=A0 if (the instruction is not found)
=A0 =A0=A0 =A0=A0 {
=A0=A0=A0 =A0=A0 =A0=A0 Get the instruction manually
=A0=A0 =A0 =A0=A0 }

=A0=A0=A0 =A0 =A0 Instruction disassembley...

=A0=A0=A0 =A0 =A0 try//Execute the instruction and cope with it if the inst=
ruction fails.
=A0=A0=A0 =A0 =A0 {
=A0=A0=A0 =A0=A0 =A0=A0 Execute the current instruction for the current exe=
cution unit
=A0=A0 =A0=A0 =A0 }
=A0=A0=A0 =A0 =A0 catch (cpu_memory_fault& t)
=A0=A0 =A0=A0 =A0 {
=A0=A0 =A0=A0 =A0=A0=A0 this->memory_trap (t);
=A0 =A0 =A0 =A0=A0=A0 this->yield ();
=A0 =A0 =A0 =A0 }
=A0=A0=A0=A0=A0=A0=A0 catch (cpu_exception& t)
=A0 =A0 =A0 =A0 {
=A0=A0=A0 =A0=A0 =A0=A0 this->yield ();//A halt instruction will cause a
cpu_exception and a yeild()
=A0=A0 =A0=A0 =A0 }

=A0=A0 =A0=A0=A0=A0 try {
=A0 =A0 =A0 =A0=A0=A0 if(Second execution unit){
=A0=A0=A0 =A0=A0=A0=A0=A0=A0=A0 Execute a writeback on a pair of write stac=
ks
=A0=A0 =A0=A0 =A0=A0=A0 }
=A0 =A0=A0 =A0=A0 }
=A0=A0 =A0=A0 =A0 catch (cpu_memory_fault& t)
=A0=A0 =A0=A0 =A0 {
=A0=A0 =A0=A0 =A0=A0=A0 this->memory_trap (t);
=A0=A0 =A0=A0 =A0=A0=A0 this->yield();
=A0 =A0=A0 =A0=A0 }
=A0=A0 =A0=A0 =A0 catch (cpu_exception& t)
=A0 =A0=A0 =A0=A0 {
=A0 =A0=A0 =A0=A0=A0=A0 this->yield ();
=A0 =A0=A0 =A0=A0 }

=A0=A0 =A0=A0=A0=A0 move ahead through circular pipeline

=A0=A0=A0=A0=A0=A0=A0 Do post-instruction processing
=A0 =A0=A0=A0 }

=A0=A0=A0=A0=A0 if (stop_after_insns_p (1))
=A0 =A0=A0=A0=A0=A0 break;
=A0=A0=A0 }
}