MaxOS::runtime::TrapFlagExcpetion Class Reference

Exception handler for a hardware mem watch. More...

#include <gdbstub.h>

Inheritance diagram for MaxOS::runtime::TrapFlagExcpetion:

Public Member Functions
	TrapFlagExcpetion (GDBServer *server)
	Registers a handler for the TrapFlagException (interrupt 0x1)
system::cpu_status_t *	handle_interrupt (system::cpu_status_t *status) override
	Handles the interrupt 0x1 by clearing the trap flag and pausing the thread.
Public Member Functions inherited from MaxOS::hardwarecommunication::ExceptionHandler
	ExceptionHandler (uint8_t interrupt_number)
	Create a new base exception handler for an interrupt.
	~ExceptionHandler ()
virtual string	get_message (system::cpu_status_t *status)
	Get an human readable error message explaining this exception.
Public Member Functions inherited from MaxOS::hardwarecommunication::InterruptHandler
virtual void	handle_interrupt ()
	Handles an interrupt.

Additional Inherited Members
Protected Member Functions inherited from MaxOS::hardwarecommunication::InterruptHandler
	InterruptHandler (uint8_t interrupt_number, int64_t redirect=-1, uint64_t redirect_index=0)
	Creates a new interrupt handler and registers it with the interrupt manager.
virtual	~InterruptHandler ()
	Destroys the interrupt handler and unregisters it from the interrupt manager.
Protected Attributes inherited from MaxOS::hardwarecommunication::InterruptHandler
uint8_t	m_interrupt_number
	The interrupt number this handler handles.

Detailed Description

Exception handler for a hardware mem watch.

Definition at line 37 of file gdbstub.h.

Constructor & Destructor Documentation

TrapFlagExcpetion()

TrapFlagExcpetion::TrapFlagExcpetion

(

GDBServer *

server

)

Registers a handler for the TrapFlagException (interrupt 0x1)

Parameters

server

The GDB stub that will handle the exception

Definition at line 547 of file gdbstub.cpp.

: ExceptionHandler(0x1),
  m_gdb_handler(server)
{
 
}

Member Function Documentation

handle_interrupt()

cpu_status_t * TrapFlagExcpetion::handle_interrupt ( system::cpu_status_t *  status )

overridevirtual

Handles the interrupt 0x1 by clearing the trap flag and pausing the thread.

Parameters

status

The registers at time of exception

Returns

The state to return to

Reimplemented from MaxOS::hardwarecommunication::ExceptionHandler.

Definition at line 562 of file gdbstub.cpp.

                                                                       {
 
    // Clear flag
    status->rflags &= ~(1 << 8);
    m_gdb_handler->thread_regs = *status;
    m_gdb_handler->attached_thread()->thread_state = ThreadState::WAITING;
 
    // Notify the server that it stopped
    m_gdb_handler->send_message("S05");
 
    // Dont execute further until instructed by GDB
    GlobalScheduler::current_thread()->yield();
 
    // Copy the registers back as they may have been modified elsewhere
    *status = m_gdb_handler->thread_regs;
    return status;
}

References MaxOS::runtime::GDBServer::attached_thread(), MaxOS::processes::GlobalScheduler::current_thread(), MaxOS::runtime::GDBServer::send_message(), MaxOS::processes::Thread::thread_state, and MaxOS::processes::Thread::yield().

---

The documentation for this class was generated from the following files:

• /home/runner/work/MaxOS/MaxOS/kernel/include/runtime/gdbstub.h
• /home/runner/work/MaxOS/MaxOS/kernel/src/runtime/gdbstub.cpp