Directly check PEB for IsDebuggerAttached

Add constexpr getters to magicdiv class so it can be used from jitted x64/dxbc
Track the guest return address as well for guest/host sync, if multiple entries have the same guest stack find the first one with a matching guest retaddr. this fixes epic mickey 2 (which the previous guest-stack change had allowed to go ingame for a bit) and potentially also a crash in fable3.
Break if under debugger when stackpoints are overflowed

Add much more useful output for host exceptions, print out xenia_canary.exe relative offsets if exception is in module, formatmessage for ntstatus/win32err, strerror

Minor d3d12 microoptimization, instead of doing SetEventOnCompletion + WaitForSingleObject do SetEventOnCompletion w/ nullptr so that the wait happens in kernel mode, avoiding two extra context switches

add unimplemented kernel functions:
ExAllocatePoolWithTag
ObReferenceObject

ObDereferenceObject has no return value.
Log a message when ObDereferenceObject/Reference receive unregistered guest kernel objects
gave ObLookupThreadByThreadId its correct error status
hoist object_types initialization out of ObReferenceObjectByHandle
Fix out parameter values on error for a few kernel funcs
add note about msr to KeSetCurrentStackPointers
add X_STATUS_OBJECT_TYPE_MISMATCH check for xeNtSetEvent
add msr_mask field to X_KPCR

src/xenia/base/debugging.h

@@ -21,6 +21,9 @@ namespace debugging {
 // The state may change at any time (attach after launch, etc), so do not
 // cache this value. Determining if the debugger is attached is expensive,
 // though, so avoid calling it frequently.
+// chrispy: no longer expensive to check on windows, we're directly using the
+// teb/peb now to find this
+
 bool IsDebuggerAttached();
 
 // Breaks into the debugger if it is attached.

src/xenia/base/debugging_win.cc

@@ -15,7 +15,10 @@
 namespace xe {
 namespace debugging {
 
-bool IsDebuggerAttached() { return IsDebuggerPresent() ? true : false; }
+bool IsDebuggerAttached() {
+  return reinterpret_cast<const bool*>(
+      __readgsqword(0x60))[2];  // get BeingDebugged field of PEB
+}
 
 void Break() { __debugbreak(); }
 

src/xenia/base/math.h

@@ -664,6 +664,22 @@ struct MagicDiv {
     multiplier_ = PregenerateUint32Div(original, extradata_);
   }
 
+  constexpr uint32_t GetRightShift() const {
+    IDivExtraInfo extra{};
+
+    extra.value_ = extradata_;
+    return extra.info.shift_;
+  }
+
+  constexpr bool AddFlag() const {
+    IDivExtraInfo extra{};
+
+    extra.value_ = extradata_;
+    return extra.info.shift_;
+  }
+
+  constexpr uint32_t GetMultiplier() const { return multiplier_;
+  }
   constexpr uint32_t Apply(uint32_t numerator) const {
     return ApplyUint32Div(numerator, multiplier_, extradata_);
   }