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NOVA: tunnel thread start parameters via state()

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The cpu_session interface fails to be virtualized by gdb_monitor because
platform-nova uses an extended nova_cpu_session interface.

The problem was that threads have been created directly at core without
knowledge of gdb_monitor. This lead to the situation that gdb_monitor didn't
know of all threads to be debugged.

Tunnel the additional parameters required on base-nova through the state()
call of the cpu_session interface before the thread actual is started.
This commit is contained in:
Alexander Boettcher 2012-08-22 12:10:04 +02:00 committed by Norman Feske
parent 197a48a26c
commit fcd62729d4
11 changed files with 92 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
base-nova/include/base/pager.h
View File

@ -59,6 +59,7 @@ namespace Genode {
struct {
struct Thread_state thread;
addr_t sel_client_ec;
bool valid;
bool dead;
} _state;
@ -164,7 +165,10 @@ namespace Genode {
* Cancel blocking in a lock so that recall exception can take
* place.
*/
void cancel_blocking_client();
void client_cancel_blocking();
uint8_t client_recall();
void client_set_ec(addr_t ec) { _state.sel_client_ec = ec; }
};

10
base-nova/include/base/thread_state.h
View File

@ -20,7 +20,15 @@
namespace Genode {
struct Thread_state : public Cpu_state { };
struct Thread_state : public Cpu_state
{
bool transfer;
bool is_vcpu;
addr_t sel_exc_base;
Thread_state(bool trans = false) : Cpu_state(), transfer(trans),
is_vcpu(false), sel_exc_base(~0UL) {}
};
}
#endif /* _INCLUDE__BASE__THREAD_STATE_H_ */

8
base-nova/include/cpu_session/client.h
View File

@ -80,14 +80,6 @@ namespace Genode {
Native_capability native_cap(Thread_capability cap) {
return call<Rpc_native_cap>(cap); }
int start_exc_base_vcpu(Thread_capability thread, addr_t ip,
addr_t sp, addr_t exc_base,
bool vcpu = false)
{
return call<Rpc_start_exc_base_vcpu>(thread, ip, sp,
exc_base, vcpu);
}
private:
Native_capability pause_sync(Thread_capability target) {

7
base-nova/include/nova_cpu_session/nova_cpu_session.h
View File

@ -23,9 +23,6 @@ namespace Genode {
{
virtual ~Nova_cpu_session() { }
virtual int
start_exc_base_vcpu(Thread_capability thread, addr_t ip,
addr_t sp, addr_t exc_base, bool vcpu) = 0;
virtual
Native_capability native_cap(Thread_capability cap) = 0;
@ -36,15 +33,13 @@ namespace Genode {
** RPC declaration **
*********************/
GENODE_RPC(Rpc_start_exc_base_vcpu, int, start_exc_base_vcpu,
Thread_capability, addr_t, addr_t, addr_t, bool);
GENODE_RPC(Rpc_native_cap, Native_capability, native_cap,
Thread_capability);
GENODE_RPC(Rpc_pause_sync, Native_capability, pause_sync,
Thread_capability);
GENODE_RPC_INTERFACE_INHERIT(Cpu_session, Rpc_native_cap,
Rpc_start_exc_base_vcpu, Rpc_pause_sync);
Rpc_pause_sync);
};
}

29
base-nova/src/base/pager/pager.cc
View File

@ -44,18 +44,21 @@ void Pager_object::_page_fault_handler()
int ret = obj->pager(ipc_pager);
if (ret) {
PWRN("unresolvable page-fault at address 0x%lx, ip=0x%lx",
ipc_pager.fault_addr(), ipc_pager.fault_ip());
if (!obj->submit_exception_signal()) {
PWRN("unresolvable page-fault at address 0x%lx, ip=0x%lx",
ipc_pager.fault_addr(), ipc_pager.fault_ip());
/* revoke paging capability, let thread die in kernel */
Nova::revoke(Obj_crd(obj->exc_pt_sel() + PT_SEL_PAGE_FAULT, 0),
true);
obj->_state.dead = true;
}
} else
/* Somebody takes care don't die - just recall and block */
obj->client_recall();
Utcb *utcb = (Utcb *)Thread_base::myself()->utcb();
utcb->set_msg_word(0);
utcb->mtd = 0;
}
ipc_pager.reply_and_wait_for_fault();
@ -133,19 +136,27 @@ void Pager_object::_invoke_handler()
void Pager_object::wake_up() { cancel_blocking(); }
void Pager_object::cancel_blocking_client() {
void Pager_object::client_cancel_blocking() {
uint8_t res = sm_ctrl(exc_pt_sel() + SM_SEL_EC_CLIENT, SEMAPHORE_UP);
if (res != NOVA_OK)
PWRN("cancel blocking failed");
}
uint8_t Pager_object::client_recall() {
return ec_ctrl(_state.sel_client_ec);
}
Pager_object::Pager_object(unsigned long badge)
: Thread_base("pager", PF_HANDLER_STACK_SIZE), _badge(badge)
{
_pt_cleanup = cap_selector_allocator()->alloc();
_sm_state_notify = cap_selector_allocator()->alloc();
_state.valid = false;
_state.dead = false;
_pt_cleanup = cap_selector_allocator()->alloc();
_sm_state_notify = cap_selector_allocator()->alloc();
_state.valid = false;
_state.dead = false;
_state.sel_client_ec = ~0UL;
/* create portal for page-fault handler */
addr_t pd_sel = __core_pd_sel;

13
base-nova/src/base/server/server.cc
View File

@ -214,9 +214,13 @@ Rpc_entrypoint::Rpc_entrypoint(Cap_session *cap_session, size_t stack_size,
throw Cpu_session::Thread_creation_failed();
addr_t thread_sp = (addr_t)&_context->stack[-4];
Genode::Nova_cpu_connection cpu;
cpu.start_exc_base_vcpu(_thread_cap, 0, thread_sp,
_tid.exc_pt_sel);
Thread_state state(true);
state.sel_exc_base = _tid.exc_pt_sel;
if (env()->cpu_session()->state(_thread_cap, &state) ||
env()->cpu_session()->start(_thread_cap, 0, thread_sp))
throw Cpu_session::Thread_creation_failed();
request_event_portal(pager_cap, _tid.exc_pt_sel,
Nova::PT_SEL_STARTUP);
@ -232,7 +236,10 @@ Rpc_entrypoint::Rpc_entrypoint(Cap_session *cap_session, size_t stack_size,
* The native thread cap is required to attach new rpc objects
* (to create portals bound to the ec)
*/
Genode::Nova_cpu_connection cpu;
Native_capability ec_cap = cpu.native_cap(_thread_cap);
if (!ec_cap.valid())
throw Cpu_session::Thread_creation_failed();
_tid.ec_sel = ec_cap.local_name();
}

15
base-nova/src/base/thread/thread_nova.cc
View File

@ -116,13 +116,20 @@ void Thread_base::start()
/* create EC at core */
addr_t thread_sp = reinterpret_cast<addr_t>(&_context->stack[-4]);
Genode::Nova_cpu_connection cpu;
if (cpu.start_exc_base_vcpu(_thread_cap, (addr_t)_thread_start,
thread_sp, _tid.exc_pt_sel, _tid.is_vcpu))
Thread_state state(true);
state.sel_exc_base = _tid.exc_pt_sel;
state.is_vcpu = _tid.is_vcpu;
if (env()->cpu_session()->state(_thread_cap, &state) ||
env()->cpu_session()->start(_thread_cap, (addr_t)_thread_start,
thread_sp))
throw Cpu_session::Thread_creation_failed();
/* request native EC thread cap */
Genode::Nova_cpu_connection cpu;
Native_capability ec_cap = cpu.native_cap(_thread_cap);
if (!ec_cap.valid())
throw Cpu_session::Thread_creation_failed();
_tid.ec_sel = ec_cap.local_name();
using namespace Nova;

12
base-nova/src/core/cpu_session_extension.cc
View File

@ -29,18 +29,6 @@ Cpu_session_component::native_cap(Thread_capability thread_cap)
return thread->platform_thread()->native_cap();
}
int
Cpu_session_component::start_exc_base_vcpu(Thread_capability thread_cap,
addr_t ip, addr_t sp,
addr_t exc_base, bool vcpu)
{
Cpu_thread_component *thread = _lookup_thread(thread_cap);
if (!thread) return -1;
return thread->platform_thread()->start((void *)ip, (void *)sp,
exc_base, vcpu);
}
Native_capability
Cpu_session_component::pause_sync(Thread_capability target_thread_cap)
{

2
base-nova/src/core/include/cpu_session_component.h
View File

@ -147,8 +147,6 @@ namespace Genode {
** NOVA specific extensions **
***********************************/
int start_exc_base_vcpu(Thread_capability, addr_t,
addr_t, addr_t, bool);
Native_capability native_cap(Thread_capability);
Native_capability pause_sync(Thread_capability);
};

8
base-nova/src/core/include/platform_thread.h
View File

@ -35,6 +35,7 @@ namespace Genode {
addr_t _sel_exc_base;
unsigned _cpu_no;
bool _is_main_thread;
bool _is_vcpu;
addr_t _sel_ec() { return _id_base; }
addr_t _sel_sc() { return _id_base + 1; }
@ -61,16 +62,11 @@ namespace Genode {
*
* \param ip instruction pointer to start at
* \param sp stack pointer to use
* \param exc_base exception base of thread in caller
* protection domain
* \param vcpu If true it will run as vCPU,
* otherwise it will be a thread.
*
* \retval 0 successful
* \retval -1 thread/vCPU could not be started
*/
int start(void *ip, void *sp, addr_t exc_base = ~0UL,
bool vcpu = false);
int start(void *ip, void *sp);
/**
* Pause this thread

46
base-nova/src/core/platform_thread.cc
View File

@ -41,7 +41,7 @@ void Platform_thread::set_cpu(unsigned int cpu_no)
}
int Platform_thread::start(void *ip, void *sp, addr_t exc_base, bool vcpu)
int Platform_thread::start(void *ip, void *sp)
{
using namespace Nova;
@ -59,10 +59,10 @@ int Platform_thread::start(void *ip, void *sp, addr_t exc_base, bool vcpu)
_pager->initial_eip((addr_t)ip);
if (!_is_main_thread) {
addr_t initial_sp = reinterpret_cast<addr_t>(sp);
addr_t utcb = vcpu ? 0 : round_page(initial_sp);
addr_t utcb = _is_vcpu ? 0 : round_page(initial_sp);
_pager->initial_esp(initial_sp);
if (exc_base == ~0UL) {
if (_sel_exc_base == ~0UL) {
PERR("exception base not specified");
return -3;
}
@ -86,10 +86,12 @@ int Platform_thread::start(void *ip, void *sp, addr_t exc_base, bool vcpu)
bool thread_global = ip;
res = create_ec(_sel_ec(), _pd->pd_sel(), _cpu_no, utcb,
initial_sp, exc_base, thread_global);
initial_sp, _sel_exc_base, thread_global);
if (res)
PERR("creation of new thread failed %u", res);
_pager->client_set_ec(_sel_ec());
return res ? -5 : 0;
}
@ -175,13 +177,17 @@ int Platform_thread::start(void *ip, void *sp, addr_t exc_base, bool vcpu)
* becomes running immediately.
*/
_pd->assign_pd(pd_sel);
_pager->client_set_ec(_sel_ec());
/* Let the thread run */
res = create_sc(_sel_sc(), pd_sel, _sel_ec(), Qpd());
if (res) {
/* Reset pd cap since thread got not running and pd cap will
* be revoked during cleanup*/
/**
* Reset pd cap since thread got not running and pd cap will
* be revoked during cleanup.
*/
_pd->assign_pd(~0UL);
_pager->client_set_ec(~0UL);
PERR("create_sc returned %d", res);
goto cleanup_ec;
@ -215,7 +221,7 @@ Native_capability Platform_thread::pause()
Native_capability notify_sm = _pager->notify_sm();
if (!notify_sm.valid()) return notify_sm;
if (Nova::ec_ctrl(_sel_ec()) != Nova::NOVA_OK)
if (_pager->client_recall() != Nova::NOVA_OK)
return Native_capability::invalid_cap();
/* If the thread is blocked in the its own SM, get him out */
@ -233,6 +239,7 @@ void Platform_thread::resume()
if (res == NOVA_OK) return;
if (!_pager) return;
/* Thread was paused beforehand and blocked in pager - wake up pager */
_pager->wake_up();
}
@ -242,9 +249,24 @@ int Platform_thread::state(Thread_state *state_dst)
{
if (!state_dst || !_pager) return -1;
int res = _pager->copy_thread_state(state_dst);
if (state_dst->transfer) {
/* Not permitted for main thread */
if (_is_main_thread) return -2;
/* You can do it only once */
if (_sel_exc_base != ~0UL) return -3;
/**
* _sel_exc_base exception base of thread in caller
* protection domain - not in Core !
* _is_vcpu If true it will run as vCPU,
* otherwise it will be a thread.
*/
_sel_exc_base = state_dst->sel_exc_base;
_is_vcpu = state_dst->is_vcpu;
return res;
return 0;
}
return _pager->copy_thread_state(state_dst);
}
@ -252,7 +274,7 @@ void Platform_thread::cancel_blocking()
{
if (!_pager) return;
_pager->cancel_blocking_client();
_pager->client_cancel_blocking();
}
@ -261,7 +283,7 @@ unsigned long Platform_thread::pager_object_badge() const { return ~0UL; }
Platform_thread::Platform_thread(const char *name, unsigned, int thread_id)
: _pd(0), _pager(0), _id_base(cap_selector_allocator()->alloc(1)),
_sel_exc_base(~0UL), _cpu_no(0), _is_main_thread(false) { }
_sel_exc_base(~0UL), _cpu_no(0), _is_main_thread(false), _is_vcpu(false) { }
Platform_thread::~Platform_thread()
@ -273,7 +295,7 @@ Platform_thread::~Platform_thread()
cap_selector_allocator()->free(_id_base, 1);
/* free exc_base used by main thread */
if (_sel_exc_base != ~0UL) {
if (_is_main_thread && _sel_exc_base != ~0UL) {
revoke(Obj_crd(_sel_exc_base, NUM_INITIAL_PT_LOG2));
cap_selector_allocator()->free(_sel_exc_base,
NUM_INITIAL_PT_LOG2);