Re: [PATCH] MIPS: KProbes support v0.1

David Daney
2010-06-11T00:13:01Z

On 06/08/2010 10:51 AM, Himanshu Chauhan wrote:
> Hi David,
>
> Thanks for taking a look.
>
[...]
>>> +
>>> +#define BREAKPOINT_INSTRUCTION 0x0000000d
>>> +
>>> +/*
>>> + * We do not have hardware single-stepping on MIPS.
>>> + * So we implement software single-stepping with breakpoint
>>> + * trap 'break 5'.
>>> + */
>>> +#define BREAKPOINT_INSTRUCTION_2 0x0000014d
>>
>> The BREAK codes are defined in asm/break.h This should be added
>> there instead.
>>
>> Why do you use codes (0 and 5) that are already kind of reserved for
>> user space debuggers?
>
> As said ealier, this patch was based on some very older patch of 2.6.16 from
> Sony Corp, I didn't make much changes like this. But anyways, I wan't aware of
> this either. What would be the best code then?
>

How about allocating them after BRK_MEMU? Say 515 and 516 or something
like that.

David Daney