86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
/*
|
|
* \brief Kernel backend for execution contexts in userland
|
|
* \author Sebastian Sumpf
|
|
* \date 2015-06-02
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2015-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
/* core includes */
|
|
#include <kernel/pd.h>
|
|
#include <kernel/thread.h>
|
|
|
|
using namespace Kernel;
|
|
|
|
void Kernel::Thread::_init() { }
|
|
|
|
void Thread::exception(unsigned const cpu)
|
|
{
|
|
if (regs->is_irq())
|
|
return;
|
|
|
|
switch(regs->cpu_exception) {
|
|
case Cpu::Context::ECALL_FROM_USER:
|
|
case Cpu::Context::ECALL_FROM_SUPERVISOR:
|
|
_call();
|
|
regs->ip += 4; /* set to next instruction */
|
|
break;
|
|
case Cpu::Context::INSTRUCTION_PAGE_FAULT:
|
|
case Cpu::Context::STORE_PAGE_FAULT:
|
|
case Cpu::Context::LOAD_PAGE_FAULT:
|
|
_mmu_exception();
|
|
break;
|
|
default:
|
|
Genode::error(*this, ": unhandled exception ", regs->cpu_exception,
|
|
" at ip=", (void*)regs->ip,
|
|
" addr=", Genode::Hex(Cpu::Sbadaddr::read()));
|
|
_die();
|
|
}
|
|
}
|
|
|
|
|
|
void Thread::_mmu_exception()
|
|
{
|
|
_become_inactive(AWAITS_RESTART);
|
|
_fault_pd = (addr_t)_pd->platform_pd();
|
|
_fault_addr = Cpu::Sbadaddr::read();
|
|
|
|
if (_pager) _pager->submit(1);
|
|
}
|
|
|
|
|
|
void Thread::_call_update_pd()
|
|
{
|
|
Cpu::sfence();
|
|
}
|
|
|
|
|
|
void Thread::_call_update_data_region()
|
|
{
|
|
Cpu::sfence();
|
|
}
|
|
|
|
|
|
void Thread::_call_update_instr_region() { }
|
|
|
|
|
|
void Kernel::Thread::proceed(unsigned const)
|
|
{
|
|
asm volatile("csrw sscratch, %1 \n"
|
|
"mv x31, %0 \n"
|
|
"ld x30, (x31) \n"
|
|
"csrw sepc, x30 \n"
|
|
".irp reg,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,"
|
|
"18,19,20,21,22,23,24,25,26,27,28,29,30 \n"
|
|
" ld x\\reg, 8 * (\\reg + 1)(x31) \n"
|
|
".endr \n"
|
|
"csrrw x31, sscratch, x31 \n"
|
|
"sret \n"
|
|
:: "r" (&*regs), "r" (regs->t6) : "x30", "x31");
|
|
}
|