f5d5ed9637
Instead of using the Genode user-level signal API to signal page-faults to a page-fault handler, use the kernel API directly. Thereby the accounting of signal contexts needed for each paging subject can be done easily. Fix #956
280 lines
7.3 KiB
C++
280 lines
7.3 KiB
C++
/*
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* \brief Thread facility
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-02-12
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*/
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/*
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* Copyright (C) 2012-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* core includes */
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#include <assert.h>
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#include <platform_thread.h>
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#include <platform_pd.h>
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#include <core_env.h>
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#include <rm_session_component.h>
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#include <map_local.h>
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#include <kernel/pd.h>
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/* kernel includes */
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#include <kernel/kernel.h>
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using namespace Genode;
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void Platform_thread::_init() { }
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bool Platform_thread::_attaches_utcb_by_itself()
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{
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/*
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* If this is a main thread outside of core it'll not manage its
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* virtual context area by itself, as it is done for other threads
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* through a sub RM-session.
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*/
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return _pd == Kernel::core_pd()->platform_pd() || !_main_thread;
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}
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Weak_ptr<Address_space> Platform_thread::address_space()
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{
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return _address_space;
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}
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Platform_thread::~Platform_thread()
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{
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/* detach UTCB */
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if (!_attaches_utcb_by_itself()) {
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/* the RM client may be destructed before platform thread */
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if (_rm_client) {
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Rm_session_component * const rm = _rm_client->member_rm_session();
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rm->detach(_utcb_pd_addr);
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}
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}
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/* free UTCB */
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Ram_session_component * const ram =
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dynamic_cast<Ram_session_component *>(core_env()->ram_session());
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assert(ram);
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ram->free(_utcb);
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/* release from pager */
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if (_rm_client) {
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Pager_object * const object = dynamic_cast<Pager_object *>(_rm_client);
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assert(object);
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Rm_session_component * const rm = _rm_client->member_rm_session();
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assert(rm);
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Pager_capability cap = reinterpret_cap_cast<Pager_object>(object->Object_pool<Pager_object>::Entry::cap());
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rm->remove_client(cap);
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}
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}
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void Platform_thread::quota(size_t const quota) {
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Kernel::thread_quota(kernel_object(), quota); }
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Platform_thread::Platform_thread(const char * const label,
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Native_utcb * utcb)
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: Kernel_object<Kernel::Thread>(true, Kernel::Cpu_priority::MAX, 0, _label),
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_pd(Kernel::core_pd()->platform_pd()),
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_rm_client(nullptr),
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_utcb_core_addr(utcb),
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_utcb_pd_addr(utcb),
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_main_thread(false)
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{
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strncpy(_label, label, LABEL_MAX_LEN);
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/* create UTCB for a core thread */
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void *utcb_phys;
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if (!platform()->ram_alloc()->alloc(sizeof(Native_utcb), &utcb_phys)) {
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PERR("failed to allocate UTCB");
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throw Cpu_session::Out_of_metadata();
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}
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map_local((addr_t)utcb_phys, (addr_t)_utcb_core_addr,
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sizeof(Native_utcb) / get_page_size());
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}
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Platform_thread::Platform_thread(size_t const quota,
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const char * const label,
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unsigned const virt_prio,
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addr_t const utcb)
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: Kernel_object<Kernel::Thread>(true, _priority(virt_prio), 0, _label),
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_pd(nullptr),
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_rm_client(nullptr),
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_utcb_pd_addr((Native_utcb *)utcb),
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_main_thread(false)
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{
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strncpy(_label, label, LABEL_MAX_LEN);
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/*
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* Allocate UTCB backing store for a thread outside of core. Page alignment
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* is done by RAM session by default. It's save to use core env because
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* this cannot be its server activation thread.
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*/
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Ram_session_component * const ram =
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dynamic_cast<Ram_session_component *>(core_env()->ram_session());
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assert(ram);
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try { _utcb = ram->alloc(sizeof(Native_utcb), CACHED); }
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catch (...) {
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PERR("failed to allocate UTCB");
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throw Cpu_session::Out_of_metadata();
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}
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_utcb_core_addr = (Native_utcb *)core_env()->rm_session()->attach(_utcb);
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}
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int Platform_thread::join_pd(Platform_pd * pd, bool const main_thread,
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Weak_ptr<Address_space> address_space)
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{
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/* check if thread is already in another protection domain */
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if (_pd && _pd != pd) {
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PERR("thread already in another protection domain");
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return -1;
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}
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/* join protection domain */
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_pd = pd;
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_main_thread = main_thread;
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_address_space = address_space;
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return 0;
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}
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void Platform_thread::affinity(Affinity::Location const & location)
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{
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_location = location;
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}
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Affinity::Location Platform_thread::affinity() const { return _location; }
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int Platform_thread::start(void * const ip, void * const sp)
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{
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/* attach UTCB in case of a main thread */
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if (_main_thread) {
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_utcb_pd_addr = utcb_main_thread();
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if (!_rm_client) {
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PERR("invalid RM client");
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return -1;
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};
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Rm_session_component * const rm = _rm_client->member_rm_session();
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try { rm->attach(_utcb, 0, 0, true, _utcb_pd_addr, 0); }
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catch (...) {
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PERR("failed to attach UTCB");
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return -1;
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}
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}
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/* initialize thread registers */
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typedef Kernel::Thread_reg_id Reg_id;
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enum { WRITES = 2 };
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addr_t * write_regs = (addr_t*) Thread_base::myself()->utcb()->base();
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write_regs[0] = Reg_id::IP;
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write_regs[1] = Reg_id::SP;
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addr_t values[] = { (addr_t)ip, (addr_t)sp };
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if (Kernel::access_thread_regs(kernel_object(), 0, WRITES, values)) {
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PERR("failed to initialize thread registers");
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return -1;
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}
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/* start executing new thread */
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if (!_pd) {
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PWRN("No protection domain associated!");
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return -1;
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}
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unsigned const cpu =
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_location.valid() ? _location.xpos() : Cpu::primary_id();
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Native_utcb * utcb = Thread_base::myself()->utcb();
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/* reset capability counter */
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utcb->cap_cnt(0);
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utcb->cap_add(_cap.dst());
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if (_main_thread) {
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utcb->cap_add(_pd->parent().dst());
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utcb->cap_add(_utcb.dst());
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}
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Kernel::start_thread(kernel_object(), cpu, _pd->kernel_pd(),
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_utcb_core_addr);
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return 0;
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}
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void Platform_thread::pager(Pager_object * const pager)
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{
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typedef Kernel::Thread_event_id Event_id;
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if (pager) {
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unsigned const sc_id = pager->cap().dst();
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if (sc_id) {
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if (!Kernel::route_thread_event(kernel_object(), Event_id::FAULT,
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sc_id)) {
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_rm_client = dynamic_cast<Rm_client *>(pager);
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return;
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}
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}
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PERR("failed to attach signal context to fault");
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return;
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} else {
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if (!Kernel::route_thread_event(kernel_object(), Event_id::FAULT, 0)) {
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_rm_client = 0;
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return;
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}
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PERR("failed to detach signal context from fault");
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return;
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}
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return;
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}
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Genode::Pager_object * Platform_thread::pager()
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{
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return _rm_client ? static_cast<Pager_object *>(_rm_client) : 0;
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}
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addr_t const * cpu_state_regs();
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size_t cpu_state_regs_length();
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Thread_state Platform_thread::state()
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{
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static addr_t const * const src = cpu_state_regs();
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static size_t const length = cpu_state_regs_length();
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static size_t const size = length * sizeof(src[0]);
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void * dst = (void*)Thread_base::myself()->utcb()->base();
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Genode::memcpy(dst, src, size);
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Thread_state thread_state;
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Cpu_state * const cpu_state = static_cast<Cpu_state *>(&thread_state);
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if (Kernel::access_thread_regs(kernel_object(), length, 0,
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(addr_t *)cpu_state)) {
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throw Cpu_session::State_access_failed();
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}
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return thread_state;
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};
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void Platform_thread::state(Thread_state thread_state)
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{
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static addr_t const * const src = cpu_state_regs();
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static size_t const length = cpu_state_regs_length();
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static size_t const size = length * sizeof(src[0]);
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void * dst = (void*)Thread_base::myself()->utcb()->base();
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Genode::memcpy(dst, src, size);
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Cpu_state * const cpu_state = static_cast<Cpu_state *>(&thread_state);
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if (Kernel::access_thread_regs(kernel_object(), 0, length,
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(addr_t *)cpu_state)) {
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throw Cpu_session::State_access_failed();
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}
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};
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