diff options
Diffstat (limited to 'src/cpu/simple')
| -rw-r--r-- | src/cpu/simple/timing.cc | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/src/cpu/simple/timing.cc b/src/cpu/simple/timing.cc index 14e760af9..b5450cf5f 100644 --- a/src/cpu/simple/timing.cc +++ b/src/cpu/simple/timing.cc @@ -680,25 +680,32 @@ TimingSimpleCPU::advanceInst(const Fault &fault) return; if (fault != NoFault) { - DPRINTF(SimpleCPU, "Fault occured, scheduling fetch event\n"); + DPRINTF(SimpleCPU, "Fault occured. Handling the fault\n"); advancePC(fault); - Tick stall = dynamic_pointer_cast<SyscallRetryFault>(fault) ? - clockEdge(syscallRetryLatency) : clockEdge(); - - reschedule(fetchEvent, stall, true); + // A syscall fault could suspend this CPU (e.g., futex_wait) + // If the _status is not Idle, schedule an event to fetch the next + // instruction after 'stall' ticks. + // If the cpu has been suspended (i.e., _status == Idle), another + // cpu will wake this cpu up later. + if (_status != Idle) { + DPRINTF(SimpleCPU, "Scheduling fetch event after the Fault\n"); + + Tick stall = dynamic_pointer_cast<SyscallRetryFault>(fault) ? + clockEdge(syscallRetryLatency) : clockEdge(); + reschedule(fetchEvent, stall, true); + _status = Faulting; + } - _status = Faulting; return; } - if (!t_info.stayAtPC) advancePC(fault); if (tryCompleteDrain()) - return; + return; if (_status == BaseSimpleCPU::Running) { // kick off fetch of next instruction... callback from icache |