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23 October 2021, 00:29:24 UTC
Revision f8b435bb918412c9410da4c4b0b02b6b3d99b27c authored by Rabin Vincent on 04 July 2012, 06:37:37 UTC, committed by Russell King on 05 July 2012, 11:57:16 UTC 
ARM: 7440/1: kprobes: only test 'sub pc, pc, #1b-2b+8-2' on ARMv6
 
'sub pc, pc, #1b-2b+8-2' results in address<1:0> == '10'.

sub pc, pc, #const (== ADR pc, #const) performs an interworking branch
(BXWritePC()) on ARMv7+ and a simple branch (BranchWritePC()) on earlier
versions.

In ARM state, BXWritePC() is UNPREDICTABLE when address<1:0> == '10'.

In ARM state on ARMv6+, BranchWritePC() ignores address<1:0>.  Before
ARMv6, BranchWritePC() is UNPREDICTABLE if address<1:0> != '00'

So the instruction is UNPREDICTABLE both before and after v6.

Acked-by: Jon Medhurst <tixy@yxit.co.uk>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
1 parent fdeb8e3
History
Tip revision: f8b435bb918412c9410da4c4b0b02b6b3d99b27c authored by Rabin Vincent on 04 July 2012, 06:37:37 UTC
ARM: 7440/1: kprobes: only test 'sub pc, pc, #1b-2b+8-2' on ARMv6
Tip revision: f8b435b
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