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Loader: reflect faults to client

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With this patch, the loader installs an optional client-provided fault
handler as default CPU exception handler and RM fault handler for all
CPU and RM sessions of the loaded subsystem. This way, loader clients
become able to respond to failures occuring within the subsystem.

The new feature is provided via the added 'Loader::fault_handler' RPC
function.

The 'run/failsafe' test covers two cases related to the loader, which
are faults produced by the immediate child of the loader and faults
produced by indirect children.
This commit is contained in:
Norman Feske
2013-01-04 15:24:11 +01:00
parent b0c18d0362
commit ecdbdef8ee
6 changed files with 301 additions and 46 deletions
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19
os/include/loader_session/loader_session.h
View File

@ -116,6 +116,20 @@ namespace Loader {
*/
virtual void view_ready_sigh(Signal_context_capability sigh) = 0;
/**
* Register signal handler notified when a failure occurs in the
* loaded subsystem.
*
* This signal is delivered if any child process of the subsystem
* produces an unresolvable page fault, exists, or triggers a CPU
* exception. (e.g., division by zero) For more information about
* the possible types of faults, please refer to the documentation of
* 'Rm_session::fault_handler' and 'Cpu_session::exception_handler'.
*
* This function should not be called after the 'start' function.
*/
virtual void fault_sigh(Signal_context_capability sigh) = 0;
/**
* Start subsystem
*
@ -152,6 +166,7 @@ namespace Loader {
GENODE_RPC(Rpc_ram_quota, void, ram_quota, size_t);
GENODE_RPC(Rpc_constrain_geometry, void, constrain_geometry, int, int);
GENODE_RPC(Rpc_view_ready_sigh, void, view_ready_sigh, Signal_context_capability);
GENODE_RPC(Rpc_fault_sigh, void, fault_sigh, Signal_context_capability);
GENODE_RPC_THROW(Rpc_start, void, start,
GENODE_TYPE_LIST(Rom_module_does_not_exist),
Name const &, Name const &, Native_pd_args const &);
@ -161,8 +176,8 @@ namespace Loader {
GENODE_RPC_INTERFACE(Rpc_alloc_rom_module, Rpc_commit_rom_module,
Rpc_ram_quota, Rpc_constrain_geometry,
Rpc_view_ready_sigh, Rpc_start, Rpc_view,
Rpc_view_geometry);
Rpc_view_ready_sigh, Rpc_fault_sigh, Rpc_start,
Rpc_view, Rpc_view_geometry);
};
}