Re: [PATCH 3/4] Enable tracing of pseudo-registers on ARM

[Yao Qi <qiyaoltc@gmail.com>]

Antoine Tremblay <antoine.tremblay@ericsson.com> writes:

> +/* Map the pseudo register number REG to the proper register number.  */
> +
> +static int
> +arm_pseudo_register_to_register (struct gdbarch *gdbarch, int reg)
> +{
> +  int rawnum = 0;
> +  int num_regs = gdbarch_num_regs (gdbarch);
> +
> +  /* Single precision pseudo registers. s0-s31.  */
> +  if (reg >= num_regs && reg < num_regs + 32)
> +    {
> +      rawnum = (reg - num_regs) / 2 + 26;

We should get double register number via user_reg_map_name_to_regnum,

      xsnprintf (name_buf, sizeof (name_buf), "d%d", (reg - num_regs) / 2);
      double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
						   strlen (name_buf));

> +    }
> +  /* Quadruple precision pseudo regisers. q0-q15.  */
> +  else if (reg >= num_regs + 32 && reg < num_regs + 32 + 16)
> +    {
> +      rawnum = (reg - num_regs - 32) * 2 + 26;

Likewise,

      xsnprintf (name_buf, sizeof (name_buf), "d%d", (reg - num_regs) * 2);
      double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
						   strlen (name_buf));

additionally, we need to check gdbarch_tdep (gdbarch)->have_neon_pseudos,

> +    }
> +  /* Error bad register number.  */
> +  else
> +    return -1;
> +
> +  return rawnum;
> +}

We also need a test case, and you can extend gdb.trace/tfile-avx.exp.
Probably, it can be renamed to gdb.trace/tracefile-pseudo-reg.exp, and
put x86 and arm tests in it.

-- 
Yao (齐尧)