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Commit 03dfa442 authored by Chris Zankel's avatar Chris Zankel
Browse files

[XTENSA] Remove unused code 



We will never (need to) support signal handling coming from a
double exception. There are too many things that could go wrong
and delivering signals is not the fastest method for IPC, anyway.

Signed-off-by: default avatarChris Zankel <chris@zankel.net>
parent 3b4a49e2

arch/xtensa/kernel/entry.S

+0 −22
Original line number Diff line number Diff line
@@ -28,7 +28,6 @@ 


/* Unimplemented features. */



#undef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION

#undef KERNEL_STACK_OVERFLOW_CHECK

#undef PREEMPTIBLE_KERNEL

#undef ALLOCA_EXCEPTION_IN_IRAM
@@ -431,11 +430,8 @@ common_exception_return: 
	_bbsi.l	a4, TIF_NEED_RESCHED, 3f

	_bbci.l	a4, TIF_SIGPENDING, 4f



#ifndef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION

	l32i	a4, a1, PT_DEPC

	bgeui	a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 4f

#endif



	/* Reenable interrupts and call do_signal() */



	wsr	a3, PS
@@ -1247,16 +1243,6 @@ fast_syscall_spill_registers_fixup: 
	 * Note: This frame might be the same as above.

	 */



#ifdef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION

	/* Restore registers we precautiously saved.

	 * We have the value of the 'right' a3

	 */



	l32i	a7, a2, PT_AREG5

	l32i	a11, a2, PT_AREG6

	l32i	a15, a2, PT_AREG7

#endif



	/* Setup stack pointer. */



	addi	a2, a2, -PT_USER_SIZE
@@ -1290,14 +1276,6 @@ fast_syscall_spill_registers_fixup_return: 
	s32i	a2, a3, EXC_TABLE_PARAM

	l32i	a2, a3, EXC_TABLE_KSTK



#ifdef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION

	/* Save registers again that might be clobbered. */



	s32i	a7, a2, PT_AREG5

	s32i	a11, a2, PT_AREG6

	s32i	a15, a2, PT_AREG7

#endif



	/* Load WB at the time the exception occurred. */



	rsr	a3, SAR			# WB is still in SAR