Created a lot of new platform wrappers for windows only functions
also removed hyperevade from the linux module build and added a empty
stub for the transparent functions they provide which can be filled in
later.
In Debugger Mode, breaking the debuggee and then reading registers (e.g. the
'r' command) could bugcheck the debuggee with DRIVER_IRQL_NOT_LESS_OR_EQUAL
(0xD1) at IRQL 0xff.
Root cause: DebuggerCommandReadRegisters() copies GUEST_REGS from
DbgState->Regs, but the per-core DbgState->Regs is only populated on the
event-triggered halt paths. A core halted via a manual break
(DEBUGGER_VMCALL_VM_EXIT_HALT_SYSTEM) or via the NMI broadcast (KdHandleNmi)
never had DbgState->Regs set, so it was NULL and the GUEST_REGS memcpy
dereferenced address 0.
Fix:
- Add VmFuncGetGuestRegs(CoreId) returning g_GuestState[CoreId].Regs (the
guest GP registers saved on the last vm-exit).
- Populate DbgState->Regs from it on the two manual-halt entry points
(DEBUGGER_VMCALL_VM_EXIT_HALT_SYSTEM and KdHandleNmi) so register reads on a
manually-halted core return the correct values.
- Add a defensive NULL check in DebuggerCommandReadRegisters().
