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core: Introduce default CPU exception handler

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The CPU session interfaces comes with the ability to install an
exception handler per thread. This patch enhances the feature with the
provision of a default signal handler that is used if no thread-specific
handler is installed. The default signal handler can be set by
specifying an invalid thread capability and a valid signal context
capability.

Furthermore, this patch relaxes the requirement of the order of the
calls of 'exception_handler' and 'set_pager'. Originally, the exception
handler could be installed not before setting a pager. Now, we remember
the installed exception handler in the 'Cpu_thread' and propagate to to
the platform thread at a later time.
This commit is contained in:
Norman Feske
2013-01-03 20:29:18 +01:00
parent 9b24115c08
commit 9f82764316
8 changed files with 170 additions and 34 deletions
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37
base-linux/src/core/include/cpu_session_component.h
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@ -47,15 +47,19 @@ namespace Genode {
{
private:
Platform_thread _platform_thread;
bool _bound; /* pd binding flag */
Platform_thread _platform_thread;
bool _bound; /* pd binding flag */
Signal_context_capability _sigh; /* exception handler */
public:
Cpu_thread_component(const char *name, unsigned priority,
addr_t utcb)
: _platform_thread(name, priority, utcb), _bound(false) { }
Cpu_thread_component(const char *name, unsigned priority, addr_t utcb,
Signal_context_capability sigh)
:
_platform_thread(name, priority, utcb), _bound(false), _sigh(sigh)
{
update_exception_sigh();
}
/************************
@ -65,6 +69,17 @@ namespace Genode {
inline Platform_thread * platform_thread() { return &_platform_thread; }
inline bool bound() const { return _bound; }
inline void bound(bool b) { _bound = b; }
void sigh(Signal_context_capability sigh)
{
sigh = sigh;
update_exception_sigh();
}
/**
* Propagate exception handler to platform thread
*/
void update_exception_sigh();
};
@ -83,6 +98,12 @@ namespace Genode {
created with this
session */
/**
* Exception handler that will be invoked unless overridden by a
* call of 'Cpu_session::exception_handler'.
*/
Signal_context_capability _default_exception_handler;
/**
* Lookup thread in CPU session by its capability
*
@ -127,11 +148,9 @@ namespace Genode {
** CPU session interface **
***************************/
Thread_capability create_thread(Name const &, addr_t utcb);
Thread_capability create_thread(Name const &, addr_t);
Ram_dataspace_capability utcb(Thread_capability thread);
void kill_thread(Thread_capability);
Thread_capability first();
Thread_capability next(Thread_capability);
int set_pager(Thread_capability, Pager_capability);
int start(Thread_capability, addr_t, addr_t);
void pause(Thread_capability thread_cap);