extern "C" void pageFaultHandler(uint32 address, uint32 error)
{
PageFaultHandler::enterPageFault(address, error & FLAG_PF_USER,
error & FLAG_PF_PRESENT,
error & FLAG_PF_RDWR,
error & FLAG_PF_INSTR_FETCH);
if (currentThread->switch_to_userspace_)
arch_contextSwitch();
else
asm volatile ("movl %%cr3, %%eax; movl %%eax, %%cr3;" ::: "%eax");
}
extern "C" void irqHandler_0()
{
ArchCommon::drawHeartBeat();
Scheduler::instance()->incTicks();
Scheduler::instance()->schedule();
// kprintfd("irq0: Going to leave irq Handler 0\n");
ArchInterrupts::EndOfInterrupt(0);
arch_contextSwitch();
}
extern "C" void errorHandler(size_t num, size_t rip, size_t cs, size_t spurious)
{
if (spurious)
{
assert(num < 128 && "there are only 128 interrupts");
debug(CPU_ERROR, "Spurious Interrupt %zu (%zx)\n", num, num);
}
else
{
assert(num < 32 && "there are only 32 CPU errors");
debug(CPU_ERROR, "\033[1;31m%s\033[0;39m\n", errors[num]);
}
const bool userspace = (cs & 0x3);
debug(CPU_ERROR, "Instruction Pointer: %zx, Userspace: %d - currentThread: %p %zd" ":%s, switch_to_userspace_: %d\n",
rip, userspace, currentThread,
currentThread ? currentThread->getTID() : -1, currentThread ? currentThread->getName() : 0,
currentThread ? currentThread->switch_to_userspace_ : -1);
const Stabs2DebugInfo* deb = kernel_debug_info;
assert(currentThread && "there should be no fault before there is a current thread");
assert(currentThread->kernel_registers_ && "every thread needs kernel registers");
ArchThreadRegisters* registers_ = currentThread->kernel_registers_;
if (userspace)
{
assert(currentThread->loader_ && "User Threads need to have a Loader");
assert(currentThread->user_registers_ && (currentThread->user_registers_->cr3 == currentThread->kernel_registers_->cr3 &&
"User and Kernel CR3 register values differ, this most likely is a bug!"));
deb = currentThread->loader_->getDebugInfos();
registers_ = currentThread->user_registers_;
}
if(deb && registers_->eip)
{
debug(CPU_ERROR, "This Fault was probably caused by:");
deb->printCallInformation(registers_->eip);
}
ArchThreads::printThreadRegisters(currentThread, false);
currentThread->printBacktrace(true);
if (spurious)
{
if (currentThread->switch_to_userspace_)
arch_contextSwitch();
}
else
{
currentThread->switch_to_userspace_ = false;
currentThreadRegisters = currentThread->kernel_registers_;
ArchInterrupts::enableInterrupts();
debug(CPU_ERROR, "Terminating process...\n");
currentThread->kill();
}
}
extern "C" void dummyHandler()
{
uint32 saved_switch_to_userspace = currentThread->switch_to_userspace_;
currentThread->switch_to_userspace_ = 0;
currentThreadRegisters = currentThread->kernel_registers_;
ArchInterrupts::enableInterrupts();
kprintfd("DUMMY_HANDLER: Spurious INT\n");
ArchInterrupts::disableInterrupts();
currentThread->switch_to_userspace_ = saved_switch_to_userspace;
if (currentThread->switch_to_userspace_)
{
currentThreadRegisters = currentThread->user_registers_;
arch_contextSwitch();
}
}
extern "C" void pageFaultHandler(uint32 address, uint32 error)
{
printPageFaultInfo(address, error);
//save previous state on stack of currentThread
uint32 saved_switch_to_userspace = currentThread->switch_to_userspace_;
currentThread->switch_to_userspace_ = 0;
currentThreadRegisters = currentThread->kernel_registers_;
ArchInterrupts::enableInterrupts();
const bool page_present = (error & FLAG_PF_PRESENT);
const bool user_pagefault = (error & FLAG_PF_USER);
//lets hope this Exeption wasn't thrown during a TaskSwitch
if (!page_present && address < USER_BREAK && currentThread->loader_)
{
if (!user_pagefault && address < PAGE_SIZE)
currentThread->printBacktrace(true);
currentThread->loader_->loadPage(address);
}
else
{
debug(PAGEFAULT, "ERROR: The virtual page of address %x (%s-address) is present,"
"the pagefault was triggered by thread %s(%p), which is a %s""thread.\n",
address, address >= USER_BREAK ? "kernel" : "user", currentThread->getName(),
currentThread, currentThread->user_registers_ ? "user" : "kernel");
currentThread->printBacktrace(true);
if (currentThread->loader_)
Syscall::exit(9999);
else
currentThread->kill();
}
ArchInterrupts::disableInterrupts();
asm volatile ("movl %%cr3, %%eax; movl %%eax, %%cr3;" ::: "%eax");
currentThread->switch_to_userspace_ = saved_switch_to_userspace;
if (currentThread->switch_to_userspace_)
{
currentThreadRegisters = currentThread->user_registers_;
arch_contextSwitch();
}
}
extern "C" void syscallHandler()
{
currentThread->switch_to_userspace_ = 0;
currentThreadRegisters = currentThread->kernel_registers_;
ArchInterrupts::enableInterrupts();
currentThread->user_registers_->eax = Syscall::syscallException(currentThread->user_registers_->eax,
currentThread->user_registers_->ebx,
currentThread->user_registers_->ecx,
currentThread->user_registers_->edx,
currentThread->user_registers_->esi,
currentThread->user_registers_->edi);
ArchInterrupts::disableInterrupts();
currentThread->switch_to_userspace_ = 1;
currentThreadRegisters = currentThread->user_registers_;
//ArchThreads::printThreadRegisters(currentThread,false);
arch_contextSwitch();
}
extern "C" void irqHandler_65()
{
Scheduler::instance()->schedule();
// kprintfd("irq65: Going to leave int Handler 65 to user\n");
arch_contextSwitch();
}
