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authorMarcin Nowakowski <marcin.nowakowski@imgtec.com>2016-09-30 11:33:46 +0200
committerRalf Baechle <ralf@linux-mips.org>2016-10-06 17:37:40 +0200
commitd05c513069f15be5de766026a4192998688ffff1 (patch)
tree7948594b560af72ed535a41cc567de4235562ff8 /arch/mips/pci/pci.c
parente3031b32840c1bee228c58bb284ebc05f97249c7 (diff)
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MIPS: tracing: disable uprobe/kprobe on compact branch instructions
Current instruction decoder for uprobe/kprobe handler only handles branches with delay slots. For compact branches the behaviour is rather unpredictable - and depending on the encoding of a compact branch instruction may result in one (or more) of: - executing an instruction that follows a branch which wasn't in a delay slot and shouldn't have been executed - incorrectly emulating a branch leading to a jump to a wrong location - unexpected branching out of the single-stepped code and never reaching the breakpoint that should terminate the probe handler Results of these actions are generally unpredictable, but can end up with a probed application or kernel crash, so disable placing probes on compact branches until they are handled properly. Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14336/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/pci/pci.c')
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