On Thu, Oct 22, 2020 at 10:21:40PM +0900, Masami Hiramatsu wrote:
> extern void insn_init(struct insn *insn, const void *kaddr, int buf_len, int
> x86_64);
> extern void insn_get_prefixes(struct insn *insn);
> extern void insn_get_opcode(struct insn *insn);
> extern void insn_get_modrm(struct insn *insn);
> extern void insn_get_sib(struct insn *insn);
> extern void insn_get_displacement(struct insn *insn);
> extern void insn_get_immediate(struct insn *insn);
> extern void insn_get_length(struct insn *insn);
...
> Ah, so you meant that we don't need such a different insn_get_* APIs,
> but a single insn_decode() API, which will decode all fields.
> (IOW, alias of insn_init() and insn_get_length(), right?)
Yes, so there should be a balance between what one wants to decode:
length, opcodes, etc
vs
when one needs only a certain *single* aspect: sib, length,
displacement, etc.
So if you need a couple of things, you can simply call the insn_decode()
function - I'm reading forward and I like your naming :) - and when
that returns success, you can be sure that struct insn contains all the
fields needed.
Otherwise...
> > If there are specialized uses, you can call some of the insn_get_*
> > helpers if you're not interested in decoding the full insn.
>
> OK, agreed.
... yes, exactly!
> > But if simply calling insn_decode_insn() would give you everything and
> > that is not that expensive, we can do that - API simplicity.
>
> I rather like simple "insn_decode()" function, no need to repeat
> insn again.
>
> int insn_decode(struct insn *insn, const void *kaddr, int buf_len, bool
> x86_64);
Yap, good.
Ok, seems we agree, lemme poke at this one more time, convert some users
and we can see how it looks like and talk then.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
