On Thu, Nov 02, 2017 at 09:51:08AM +0100, Ingo Molnar wrote:
>
> * Ricardo Neri <ricardo.neri-calde...@linux.intel.com> wrote:
>
> > + /*
> > + * -EDOM means that we must ignore the address_offset. In such a case,
> > + * in 64-bit mode the effective address relative to the RIP of the
> > + * following instruction.
> > + */
> > + if (*regoff == -EDOM) {
> > + if (user_64bit_mode(regs))
> > + tmp = (long)regs->ip + insn->length;
> > + else
> > + tmp = 0;
> > + } else if (*regoff < 0) {
> > + return -EINVAL;
> > + } else {
> > + tmp = (long)regs_get_register(regs, *regoff);
> > + }
>
> > + else
> > + indx = (long)regs_get_register(regs, indx_offset);
>
> This and subsequent patches include a disgustly insane amount of type casts -
> why?
>
> For example here 'tmp' is 'long', while regs_get_register() returns
> 'unsigned long', but no type cast is necessary for that.
>
> > + ret = get_eff_addr_modrm(insn, regs, &addr_offset,
> > + &eff_addr);
One of the goals of this series is to have the ability to compute 16-bit, 32-bit
and 64-bit addresses. I put lost of casts, between signed and unsigned types,
between 64-bit and 32-bit and 16-bit casts. After seeing your comment I have
gone
through the code and I have removed most of the casts. Instead I will use masks.
I will also inspect the resulting assembly code to make sure the arithmetic is
performed in the address size pertinent to each case.
>
> Also, please don't break lines slightly longer than 80 cols just to pacify
> checkpatch (and this holds for other patches as well) - the cure is worse
> than the
> illness!
I will look into these two cases and reorganize the code.
Thanks and BR,
Ricardo
