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SubjectRe: [PATCH v5 05/16] ARM: use a function table for determining instruction interpreter action
On 02/03/14 09:24, Jon Medhurst (Tixy) wrote:
> On Thu, 2014-01-23 at 15:05 -0500, David Long wrote:
>> From: "David A. Long" <dave.long@linaro.org>
>>
>> Make the instruction interpreter call back to semantic action functions
>> through a function pointer array provided by the invoker. The interpreter
>> decodes the instructions into groups and uses the group number to index
>> into the supplied array. kprobes and uprobes code will each supply their
>> own array of functions.
>>
>> Signed-off-by: David A. Long <dave.long@linaro.org>
>> ---
>
> [...]
>
>> --- a/arch/arm/kernel/probes.c
>> +++ b/arch/arm/kernel/probes.c
>> @@ -378,10 +378,11 @@ static const int decode_struct_sizes[NUM_DECODE_TYPES] = {
>> */
>> int __kprobes
>> kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi,
>> - const union decode_item *table, bool thumb)
>> + const union decode_item *table, bool thumb,
>> + const union decode_action *actions)
>> {
>> - const struct decode_header *h = (struct decode_header *)table;
>> - const struct decode_header *next;
>> + struct decode_header *h = (struct decode_header *)table;
>> + struct decode_header *next;
>
> The decode tables are fixed structures which nothing should want to
> modify, so I think the const's above should be kept. I believe that
> you've had to resort to changing them because the following typedef
> lacks a 'const' on the final argument....
>

I've made the change.

> [...]
>> diff --git a/arch/arm/kernel/probes.h b/arch/arm/kernel/probes.h
>> index c610fa9..81b6e61 100644
> [...]
>>
>> +typedef enum kprobe_insn (probes_custom_decode_t)(kprobe_opcode_t,
>> + struct arch_specific_insn *,
>> + struct decode_header *);
>> +
>
> Adding 'const' above will also have the knock on effect of requiring
> const on all the 'custom decode' functions as well.
>

I've made those numerous changes as well.

-dl



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