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arm64: kernel: Fix unmasked debug exceptions when restoring mdscr_el1 

Changes to make the resume from cpu_suspend() code behave more like
secondary boot caused debug exceptions to be unmasked early by
__cpu_setup(). We then go on to restore mdscr_el1 in cpu_do_resume(),
potentially taking break or watch points based on uninitialised registers.

Mask debug exceptions in cpu_do_resume(), which is specific to resume
from cpu_suspend(). Debug exceptions will be restored to their original
state by local_dbg_restore() in cpu_suspend(), which runs after
hw_breakpoint_restore() has re-initialised the other registers.

Reported-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Fixes: cabe1c81ea ("arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va")
Cc: <stable@vger.kernel.org> # 4.7+
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
James Morse 2016-08-26 16:03:42 +01:00 committed by Catalin Marinas
parent 63fb0a9516
commit 744c6c37cc
1 changed files with 9 additions and 0 deletions
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9
arch/arm64/mm/proc.S
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@ -100,7 +100,16 @@ ENTRY(cpu_do_resume)
msr tcr_el1, x8
msr vbar_el1, x9
/*
* __cpu_setup() cleared MDSCR_EL1.MDE and friends, before unmasking
* debug exceptions. By restoring MDSCR_EL1 here, we may take a debug
* exception. Mask them until local_dbg_restore() in cpu_suspend()
* resets them.
*/
disable_dbg
msr mdscr_el1, x10
msr sctlr_el1, x12
/*
* Restore oslsr_el1 by writing oslar_el1