Differential D54335 Diff 168505 sys/vm/vm_fault.c

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sys/vm/vm_fault.c

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	#define UCODE_PAGEFLT 12			#define UCODE_PAGEFLT 12
	#ifdef T_PAGEFLT			#ifdef T_PAGEFLT
	_Static_assert(UCODE_PAGEFLT == T_PAGEFLT, "T_PAGEFLT");			_Static_assert(UCODE_PAGEFLT == T_PAGEFLT, "T_PAGEFLT");
	#endif			#endif

	/*			/*
	* vm_fault_trap:			* vm_fault_trap:
	*			*
	* Helper for the page fault trap handlers, wrapping vm_fault().			* Helper for the machine-dependent page fault trap handlers, wrapping
	* Issues ktrace(2) tracepoints for the faults.			* vm_fault(). Issues ktrace(2) tracepoints for the faults.
	*			*
	* If a fault cannot be handled successfully by satisfying the			* If the fault cannot be handled successfully by updating the
	* required mapping, and the faulted instruction cannot be restarted,			* required mapping, and the faulted instruction cannot be restarted,
	* the signal number and si_code values are returned for trapsignal()			* the signal number and si_code values are returned for trapsignal()
	* to deliver.			* to deliver.
	*			*
	* Returns Mach error codes, but callers should only check for			* Returns Mach error codes, but callers should only check for
	* KERN_SUCCESS.			* KERN_SUCCESS.
	*/			*/
	int			int
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	* Handle a page fault occurring at the given address, requiring the			* Handle a page fault occurring at the given address, requiring the
	* given permissions, in the map specified. If successful, the page			* given permissions, in the map specified. If successful, the page
	* is inserted into the associated physical map, and optionally			* is inserted into the associated physical map, and optionally
	* referenced and returned in *m_hold.			* referenced and returned in *m_hold.
	*			*
	* The given address should be truncated to the proper page address.			* The given address should be truncated to the proper page address.
	*			*
	* KERN_SUCCESS is returned if the page fault is handled; otherwise, a			* KERN_SUCCESS is returned if the page fault is handled; otherwise, a
	* Mach error specifying why the fault is fatal is returned.			* Mach error code explaining why the fault is fatal is returned.
	*			*
	* The map in question must be alive, either being the map for current			* The map in question must be alive, either being the map for the current
	* process, or the owner process hold count incremented to prevent			* process, or the owner process hold count has been incremented to prevent
	* exit().			* exit().
	*			*
	* If the thread private TDP_NOFAULTING flag is set, any fault results			* If the thread private TDP_NOFAULTING flag is set, any fault results
	* in immediate protection failure. Otherwise the fault is processed,			* in immediate protection failure. Otherwise the fault is processed,
	* and caller may hold no locks.			* and caller may hold no locks.
	*/			*/
	int			int
	vm_fault(vm_map_t map, vm_offset_t vaddr, vm_prot_t fault_type,			vm_fault(vm_map_t map, vm_offset_t vaddr, vm_prot_t fault_type,
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