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| author | Rabin Vincent <[email protected]> | 2012-07-04 06:37:37 +0000 |
|---|---|---|
| committer | Russell King <[email protected]> | 2012-07-05 11:57:16 +0000 |
| commit | f8b435bb918412c9410da4c4b0b02b6b3d99b27c (patch) | |
| tree | 437a95d7a2b25659172cb4353b1511152e216a1c /tools/perf/util/trace-event-scripting.c | |
| parent | ARM: 7441/1: perf: return -EOPNOTSUPP if requested mode exclusion is unavailable (diff) | |
| download | kernel-f8b435bb918412c9410da4c4b0b02b6b3d99b27c.tar.gz kernel-f8b435bb918412c9410da4c4b0b02b6b3d99b27c.zip | |
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 <[email protected]>
Signed-off-by: Rabin Vincent <[email protected]>
Signed-off-by: Russell King <[email protected]>
Diffstat (limited to 'tools/perf/util/trace-event-scripting.c')
0 files changed, 0 insertions, 0 deletions