arm64: add on_accessible_stack()

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Both unwind_frame() and dump_backtrace() try to check whether a stack
address is sane to access, with very similar logic. Both will need
updating in order to handle overflow stacks.

Factor out this logic into a helper, so that we can avoid further
duplication when we add overflow stacks.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>

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This commit is contained in:

Mark Rutland 2017-08-01 18:51:15 +01:00

parent e3067861ba

commit 12964443e8

3 changed files with 18 additions and 8 deletions

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16

arch/arm64/include/asm/stacktrace.h

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7

arch/arm64/kernel/stacktrace.c

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3

arch/arm64/kernel/traps.c

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