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Commit f8c2ee22 authored by Harvey Harrison's avatar Harvey Harrison Committed by Ingo Molnar
Browse files

x86: unify fault_32|64.c with ifdefs 



Elimination of these ifdefs can be done in a unified file.

Signed-off-by: default avatarHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 1156e098

arch/x86/mm/fault_32.c

+95 −5
Original line number Diff line number Diff line
@@ -48,7 +48,11 @@ static inline int notify_page_fault(struct pt_regs *regs) 
	int ret = 0;



	/* kprobe_running() needs smp_processor_id() */

#ifdef CONFIG_X86_32

	if (!user_mode_vm(regs)) {

#else

	if (!user_mode(regs)) {

#endif

		preempt_disable();

		if (kprobe_running() && kprobe_fault_handler(regs, 14))

			ret = 1;
@@ -430,11 +434,15 @@ static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs, 
#endif



/*

 * X86_32

 * Handle a fault on the vmalloc or module mapping area

 *

 * X86_64

 * Handle a fault on the vmalloc area

 *

 * This assumes no large pages in there.

 */

static inline int vmalloc_fault(unsigned long address)

static int vmalloc_fault(unsigned long address)

{

#ifdef CONFIG_X86_32

	unsigned long pgd_paddr;
@@ -509,6 +517,9 @@ int show_unhandled_signals = 1; 
 * and the problem, and then passes it off to one of the appropriate

 * routines.

 */

#ifdef CONFIG_X86_64

asmlinkage

#endif

void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)

{

	struct task_struct *tsk;
@@ -517,6 +528,9 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) 
	unsigned long address;

	int write, si_code;

	int fault;

#ifdef CONFIG_X86_64

	unsigned long flags;

#endif



	/*

	 * We can fault from pretty much anywhere, with unknown IRQ state.
@@ -548,6 +562,7 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) 
	 * (error_code & 4) == 0, and that the fault was not a

	 * protection error (error_code & 9) == 0.

	 */

#ifdef CONFIG_X86_32

	if (unlikely(address >= TASK_SIZE)) {

		if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) &&

		    vmalloc_fault(address) >= 0)
@@ -570,7 +585,45 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) 
	 */

	if (in_atomic() || !mm)

		goto bad_area_nosemaphore;

#else /* CONFIG_X86_64 */

	if (unlikely(address >= TASK_SIZE64)) {

		/*

		 * Don't check for the module range here: its PML4

		 * is always initialized because it's shared with the main

		 * kernel text. Only vmalloc may need PML4 syncups.

		 */

		if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) &&

		      ((address >= VMALLOC_START && address < VMALLOC_END))) {

			if (vmalloc_fault(address) >= 0)

				return;

		}

		/*

		 * Don't take the mm semaphore here. If we fixup a prefetch

		 * fault we could otherwise deadlock.

		 */

		goto bad_area_nosemaphore;

	}

	if (likely(regs->flags & X86_EFLAGS_IF))

		local_irq_enable();



	if (unlikely(error_code & PF_RSVD))

		pgtable_bad(address, regs, error_code);



	/*

	 * If we're in an interrupt, have no user context or are running in an

	 * atomic region then we must not take the fault.

	 */

	if (unlikely(in_atomic() || !mm))

		goto bad_area_nosemaphore;



	/*

	 * User-mode registers count as a user access even for any

	 * potential system fault or CPU buglet.

	 */

	if (user_mode_vm(regs))

		error_code |= PF_USER;

again:

#endif

	/* When running in the kernel we expect faults to occur only to

	 * addresses in user space.  All other faults represent errors in the

	 * kernel and should generate an OOPS.  Unfortunately, in the case of an
@@ -596,7 +649,11 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) 
	vma = find_vma(mm, address);

	if (!vma)

		goto bad_area;

#ifdef CONFIG_X86_32

	if (vma->vm_start <= address)

#else

	if (likely(vma->vm_start <= address))

#endif

		goto good_area;

	if (!(vma->vm_flags & VM_GROWSDOWN))

		goto bad_area;
@@ -634,7 +691,9 @@ good_area: 
			goto bad_area;

	}



#ifdef CONFIG_X86_32

survive:

#endif

	/*

	 * If for any reason at all we couldn't handle the fault,

	 * make sure we exit gracefully rather than endlessly redo
@@ -705,6 +764,7 @@ bad_area_nosemaphore: 
			print_vma_addr(" in ", regs->ip);

			printk("\n");

		}



		tsk->thread.cr2 = address;

		/* Kernel addresses are always protection faults */

		tsk->thread.error_code = error_code | (address >= TASK_SIZE);
@@ -722,9 +782,13 @@ no_context: 
		return;



	/*

	 * X86_32

	 * Valid to do another page fault here, because if this fault

	 * had been triggered by is_prefetch fixup_exception would have

	 * handled it.

	 *

	 * X86_64

	 * Hall of shame of CPU/BIOS bugs.

	 */

	if (is_prefetch(regs, address, error_code))

		return;
@@ -736,7 +800,7 @@ no_context: 
 * Oops. The kernel tried to access some bad page. We'll have to

 * terminate things with extreme prejudice.

 */



#ifdef CONFIG_X86_32

	bust_spinlocks(1);



	show_fault_oops(regs, error_code, address);
@@ -747,6 +811,20 @@ no_context: 
	die("Oops", regs, error_code);

	bust_spinlocks(0);

	do_exit(SIGKILL);

#else /* CONFIG_X86_64 */

	flags = oops_begin();



	show_fault_oops(regs, error_code, address);



	tsk->thread.cr2 = address;

	tsk->thread.trap_no = 14;

	tsk->thread.error_code = error_code;

	if (__die("Oops", regs, error_code))

		regs = NULL;

	/* Executive summary in case the body of the oops scrolled away */

	printk(KERN_EMERG "CR2: %016lx\n", address);

	oops_end(flags, regs, SIGKILL);

#endif



/*

 * We ran out of memory, or some other thing happened to us that made
@@ -754,11 +832,18 @@ no_context: 
 */

out_of_memory:

	up_read(&mm->mmap_sem);

#ifdef CONFIG_X86_32

	if (is_global_init(tsk)) {

		yield();

		down_read(&mm->mmap_sem);

		goto survive;

	}

#else

	if (is_global_init(current)) {

		yield();

		goto again;

	}

#endif

	printk("VM: killing process %s\n", tsk->comm);

	if (error_code & PF_USER)

		do_group_exit(SIGKILL);
@@ -770,17 +855,22 @@ do_sigbus: 
	/* Kernel mode? Handle exceptions or die */

	if (!(error_code & PF_USER))

		goto no_context;



#ifdef CONFIG_X86_32

	/* User space => ok to do another page fault */

	if (is_prefetch(regs, address, error_code))

		return;



#endif

	tsk->thread.cr2 = address;

	tsk->thread.error_code = error_code;

	tsk->thread.trap_no = 14;

	force_sig_info_fault(SIGBUS, BUS_ADRERR, address, tsk);

}



#ifdef CONFIG_X86_64

DEFINE_SPINLOCK(pgd_lock);

LIST_HEAD(pgd_list);

#endif



void vmalloc_sync_all(void)

{

#ifdef CONFIG_X86_32

arch/x86/mm/fault_64.c

+82 −11
Original line number Diff line number Diff line
@@ -51,7 +51,11 @@ static inline int notify_page_fault(struct pt_regs *regs) 
	int ret = 0;



	/* kprobe_running() needs smp_processor_id() */

#ifdef CONFIG_X86_32

	if (!user_mode_vm(regs)) {

#else

	if (!user_mode(regs)) {

#endif

		preempt_disable();

		if (kprobe_running() && kprobe_fault_handler(regs, 14))

			ret = 1;
@@ -433,6 +437,10 @@ static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs, 
#endif



/*

 * X86_32

 * Handle a fault on the vmalloc or module mapping area

 *

 * X86_64

 * Handle a fault on the vmalloc area

 *

 * This assumes no large pages in there.
@@ -512,16 +520,20 @@ int show_unhandled_signals = 1; 
 * and the problem, and then passes it off to one of the appropriate

 * routines.

 */

asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,

					unsigned long error_code)

#ifdef CONFIG_X86_64

asmlinkage

#endif

void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)

{

	struct task_struct *tsk;

	struct mm_struct *mm;

	struct vm_area_struct *vma;

	unsigned long address;

	int write, fault;

	int write, si_code;

	int fault;

#ifdef CONFIG_X86_64

	unsigned long flags;

	int si_code;

#endif



	/*

	 * We can fault from pretty much anywhere, with unknown IRQ state.
@@ -553,6 +565,30 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, 
	 * (error_code & 4) == 0, and that the fault was not a

	 * protection error (error_code & 9) == 0.

	 */

#ifdef CONFIG_X86_32

	if (unlikely(address >= TASK_SIZE)) {

		if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) &&

		    vmalloc_fault(address) >= 0)

			return;

		/*

		 * Don't take the mm semaphore here. If we fixup a prefetch

		 * fault we could otherwise deadlock.

		 */

		goto bad_area_nosemaphore;

	}



	/* It's safe to allow irq's after cr2 has been saved and the vmalloc

	   fault has been handled. */

	if (regs->flags & (X86_EFLAGS_IF|VM_MASK))

		local_irq_enable();



	/*

	 * If we're in an interrupt, have no user context or are running in an

	 * atomic region then we must not take the fault.

	 */

	if (in_atomic() || !mm)

		goto bad_area_nosemaphore;

#else /* CONFIG_X86_64 */

	if (unlikely(address >= TASK_SIZE64)) {

		/*

		 * Don't check for the module range here: its PML4
@@ -570,7 +606,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, 
		 */

		goto bad_area_nosemaphore;

	}



	if (likely(regs->flags & X86_EFLAGS_IF))

		local_irq_enable();
@@ -590,8 +625,8 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, 
	 */

	if (user_mode_vm(regs))

		error_code |= PF_USER;



again:

#endif

	/* When running in the kernel we expect faults to occur only to

	 * addresses in user space.  All other faults represent errors in the

	 * kernel and should generate an OOPS.  Unfortunately, in the case of an
@@ -617,7 +652,11 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, 
	vma = find_vma(mm, address);

	if (!vma)

		goto bad_area;

#ifdef CONFIG_X86_32

	if (vma->vm_start <= address)

#else

	if (likely(vma->vm_start <= address))

#endif

		goto good_area;

	if (!(vma->vm_flags & VM_GROWSDOWN))

		goto bad_area;
@@ -655,6 +694,9 @@ good_area: 
			goto bad_area;

	}



#ifdef CONFIG_X86_32

survive:

#endif

	/*

	 * If for any reason at all we couldn't handle the fault,

	 * make sure we exit gracefully rather than endlessly redo
@@ -730,7 +772,6 @@ bad_area_nosemaphore: 
		/* Kernel addresses are always protection faults */

		tsk->thread.error_code = error_code | (address >= TASK_SIZE);

		tsk->thread.trap_no = 14;



		force_sig_info_fault(SIGSEGV, si_code, address, tsk);

		return;

	}
@@ -744,9 +785,14 @@ no_context: 
		return;



	/*

	 * X86_32

	 * Valid to do another page fault here, because if this fault

	 * had been triggered by is_prefetch fixup_exception would have

	 * handled it.

	 *

	 * X86_64

	 * Hall of shame of CPU/BIOS bugs.

	 */



	if (is_prefetch(regs, address, error_code))

		return;
@@ -757,7 +803,18 @@ no_context: 
 * Oops. The kernel tried to access some bad page. We'll have to

 * terminate things with extreme prejudice.

 */

#ifdef CONFIG_X86_32

	bust_spinlocks(1);



	show_fault_oops(regs, error_code, address);



	tsk->thread.cr2 = address;

	tsk->thread.trap_no = 14;

	tsk->thread.error_code = error_code;

	die("Oops", regs, error_code);

	bust_spinlocks(0);

	do_exit(SIGKILL);

#else /* CONFIG_X86_64 */

	flags = oops_begin();



	show_fault_oops(regs, error_code, address);
@@ -770,6 +827,7 @@ no_context: 
	/* Executive summary in case the body of the oops scrolled away */

	printk(KERN_EMERG "CR2: %016lx\n", address);

	oops_end(flags, regs, SIGKILL);

#endif



/*

 * We ran out of memory, or some other thing happened to us that made
@@ -777,10 +835,18 @@ no_context: 
 */

out_of_memory:

	up_read(&mm->mmap_sem);

#ifdef CONFIG_X86_32

	if (is_global_init(tsk)) {

		yield();

		down_read(&mm->mmap_sem);

		goto survive;

	}

#else

	if (is_global_init(current)) {

		yield();

		goto again;

	}

#endif

	printk("VM: killing process %s\n", tsk->comm);

	if (error_code & PF_USER)

		do_group_exit(SIGKILL);
@@ -792,16 +858,21 @@ do_sigbus: 
	/* Kernel mode? Handle exceptions or die */

	if (!(error_code & PF_USER))

		goto no_context;



#ifdef CONFIG_X86_32

	/* User space => ok to do another page fault */

	if (is_prefetch(regs, address, error_code))

		return;

#endif

	tsk->thread.cr2 = address;

	tsk->thread.error_code = error_code;

	tsk->thread.trap_no = 14;

	force_sig_info_fault(SIGBUS, BUS_ADRERR, address, tsk);

	return;

}



#ifdef CONFIG_X86_64

DEFINE_SPINLOCK(pgd_lock);

LIST_HEAD(pgd_list);

#endif



void vmalloc_sync_all(void)

{