Commit 40c83897 authored Feb 05, 2021 by Christophe Leroy Committed by Greg Kroah-Hartman Mar 04, 2021

powerpc/8xx: Fix software emulation interrupt



[ Upstream commit 903178d0ce6bb30ef80a3604ab9ee2b57869fbc9 ]

For unimplemented instructions or unimplemented SPRs, the 8xx triggers
a "Software Emulation Exception" (0x1000). That interrupt doesn't set
reason bits in SRR1 as the "Program Check Exception" does.

Go through emulation_assist_interrupt() to set REASON_ILLEGAL.

Fixes: fbbcc3bb ("powerpc/8xx: Remove SoftwareEmulation()")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ad782af87a222efc79cfb06079b0fd23d4224eaf.1612515180.git.christophe.leroy@csgroup.eu


Signed-off-by: Sasha Levin <sashal@kernel.org>

parent cab5b8b9

arch/powerpc/kernel/head_8xx.S

+1 −1

Original line number	Diff line number	Diff line
		@@ -269,7 +269,7 @@ SystemCall:
		/* On the MPC8xx, this is a software emulation interrupt. It occurs
		* for all unimplemented and illegal instructions.
		*/
		EXCEPTION(0x1000, SoftEmu, program_check_exception, EXC_XFER_STD)
		EXCEPTION(0x1000, SoftEmu, emulation_assist_interrupt, EXC_XFER_STD)

		. = 0x1100
		/*