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Commit e1d5c019 authored by Chris Metcalf's avatar Chris Metcalf
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arch/tile: avoid accidentally unmasking NMI-type interrupt accidentally 



The return path as we reload registers and core state requires that r30
hold a boolean indicating whether we are returning from an NMI, but in a
couple of cases we weren't setting this properly, with the result that we
could accidentally unmask the NMI interrupt(s), which could cause confusion.
Now we set r30 in every place where we jump into the interrupt return path.

Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
parent b1760c84

arch/tile/kernel/intvec_32.S

+20 −4
Original line number Diff line number Diff line
@@ -799,6 +799,10 @@ handle_interrupt: 
 * This routine takes a boolean in r30 indicating if this is an NMI.

 * If so, we also expect a boolean in r31 indicating whether to

 * re-enable the oprofile interrupts.

 *

 * Note that .Lresume_userspace is jumped to directly in several

 * places, and we need to make sure r30 is set correctly in those

 * callers as well.

 */

STD_ENTRY(interrupt_return)

	/* If we're resuming to kernel space, don't check thread flags. */
@@ -1237,7 +1241,10 @@ handle_syscall: 
	bzt     r30, 1f

	jal	do_syscall_trace

	FEEDBACK_REENTER(handle_syscall)

1:	j       .Lresume_userspace   /* jump into middle of interrupt_return */

1:	{

	 movei  r30, 0               /* not an NMI */

	 j      .Lresume_userspace   /* jump into middle of interrupt_return */

	}



.Linvalid_syscall:

	/* Report an invalid syscall back to the user program */
@@ -1246,7 +1253,10 @@ handle_syscall: 
	 movei  r28, -ENOSYS

	}

	sw      r29, r28

	{

	 movei  r30, 0               /* not an NMI */

	 j      .Lresume_userspace   /* jump into middle of interrupt_return */

	}

	STD_ENDPROC(handle_syscall)



	/* Return the address for oprofile to suppress in backtraces. */
@@ -1262,7 +1272,10 @@ STD_ENTRY(ret_from_fork) 
	jal     sim_notify_fork

	jal     schedule_tail

	FEEDBACK_REENTER(ret_from_fork)

	{

	 movei  r30, 0               /* not an NMI */

	 j      .Lresume_userspace   /* jump into middle of interrupt_return */

	}

	STD_ENDPROC(ret_from_fork)



	/*
@@ -1376,7 +1389,10 @@ handle_ill: 


	jal     send_sigtrap    /* issue a SIGTRAP */

	FEEDBACK_REENTER(handle_ill)

	{

	 movei  r30, 0               /* not an NMI */

	 j      .Lresume_userspace   /* jump into middle of interrupt_return */

	}



.Ldispatch_normal_ill:

	{

arch/tile/kernel/intvec_64.S

+16 −3
Original line number Diff line number Diff line
@@ -606,6 +606,10 @@ handle_interrupt: 
 * This routine takes a boolean in r30 indicating if this is an NMI.

 * If so, we also expect a boolean in r31 indicating whether to

 * re-enable the oprofile interrupts.

 *

 * Note that .Lresume_userspace is jumped to directly in several

 * places, and we need to make sure r30 is set correctly in those

 * callers as well.

 */

STD_ENTRY(interrupt_return)

	/* If we're resuming to kernel space, don't check thread flags. */
@@ -1058,7 +1062,10 @@ handle_syscall: 
	}

	FEEDBACK_REENTER(handle_syscall)



2:	j       .Lresume_userspace   /* jump into middle of interrupt_return */

2:	{

	 movei  r30, 0               /* not an NMI */

	 j      .Lresume_userspace   /* jump into middle of interrupt_return */

	}



.Lcompat_syscall:

	/*
@@ -1092,7 +1099,10 @@ handle_syscall: 
	 movei  r28, -ENOSYS

	}

	st      r29, r28

	{

	 movei  r30, 0               /* not an NMI */

	 j      .Lresume_userspace   /* jump into middle of interrupt_return */

	}

	STD_ENDPROC(handle_syscall)



	/* Return the address for oprofile to suppress in backtraces. */
@@ -1108,7 +1118,10 @@ STD_ENTRY(ret_from_fork) 
	jal     sim_notify_fork

	jal     schedule_tail

	FEEDBACK_REENTER(ret_from_fork)

	j       .Lresume_userspace

	{

	 movei  r30, 0               /* not an NMI */

	 j      .Lresume_userspace   /* jump into middle of interrupt_return */

	}

	STD_ENDPROC(ret_from_fork)



/* Various stub interrupt handlers and syscall handlers */