[PATCH v5 4/6] arm64: kprobes instruction simulation support

Steve Capper steve.capper at linaro.org
Fri Mar 6 03:39:44 PST 2015

On 17 February 2015 at 23:11, David Long <dave.long at linaro.org> wrote:
> From: Sandeepa Prabhu <sandeepa.prabhu at linaro.org>
> Kprobes needs simulation of instructions that cannot be stepped
> from different memory location, e.g.: those instructions
> that uses PC-relative addressing. In simulation, the behaviour
> of the instruction is implemented using a copy of pt_regs.
> Following instruction catagories are simulated:
>  - All branching instructions(conditional, register, and immediate)
>  - Literal access instructions(load-literal, adr/adrp)
> Conditional execution is limited to branching instructions in
> ARM v8. If conditions at PSTATE do not match the condition fields
> of opcode, the instruction is effectively NOP. Kprobes considers
> this case as 'miss'.
> Thanks to Will Cohen for assorted suggested changes.
> Signed-off-by: Sandeepa Prabhu <sandeepa.prabhu at linaro.org>
> Signed-off-by: William Cohen <wcohen at redhat.com>
> Signed-off-by: David A. Long <dave.long at linaro.org>
> ---

Apologies for looking at these late (I was on holiday).

I've applied this series on top of 3.19, but I get the following compile error:
arch/arm64/kernel/kprobes-arm64.c:23:34: fatal error:
probes-simulate-insn.h: No such file or directory
 #include "probes-simulate-insn.h"
compilation terminated.
scripts/Makefile.build:257: recipe for target
'arch/arm64/kernel/kprobes-arm64.o' failed

Is something missing from this patch?


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