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Patch by Jan Klötzke (with additional TODO comments):

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* Add a "fault_callback" to the thread structure which is called when a
  unhandled page fault happens in user space. A SIGSEGV will only be sent
  if the callback returns "true".


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25609 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2008-05-22 12:33:30 +00:00
parent ec09e0a89d
commit 7da0a81c0e
2 changed files with 17 additions and 3 deletions
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11
headers/private/kernel/thread_types.h
View File

@ -224,6 +224,9 @@ struct team {
typedef int32 (*thread_entry_func)(thread_func, void *);
typedef bool (*page_fault_callback)(addr_t address, addr_t faultAddress,
bool isWrite);
struct thread {
int32 flags; // summary of events relevant in interrupt
// handlers (signals pending, user debugging
@ -275,7 +278,13 @@ struct thread {
cbuf *buffer;
} msg;
addr_t fault_handler;
union {
addr_t fault_handler;
page_fault_callback fault_callback;
// TODO: this is a temporary field used for the vm86 implementation
// and should be removed again when that one is moved into the
// kernel entirely.
};
int32 page_faults_allowed;
/* this field may only stay in debug builds in the future */

9
src/system/kernel/vm/vm.cpp
View File

@ -3864,8 +3864,13 @@ vm_page_fault(addr_t address, addr_t faultAddress, bool isWrite, bool isUser,
release_sem_etc(addressSpace->sem, READ_COUNT, 0);
vm_put_address_space(addressSpace);
#endif
if (user_debug_exception_occurred(B_SEGMENT_VIOLATION, SIGSEGV))
send_signal(team_get_current_team_id(), SIGSEGV);
struct thread *thread = thread_get_current_thread();
// TODO: the fault_callback is a temporary solution for vm86
if (thread->fault_callback == NULL
|| thread->fault_callback(address, faultAddress, isWrite)) {
if (user_debug_exception_occurred(B_SEGMENT_VIOLATION, SIGSEGV))
send_signal(team_get_current_team_id(), SIGSEGV);
}
}
}