[patch 2/2] Implement gdbarch hook user_register_name on ARM

[Ulrich Weigand]

Yao Qi wrote:
> On 12/15/2010 06:22 PM, Yao Qi wrote:
> > Once this patch is applied, we leave more flexibility to backend to
> > determine what is the correct register number given a register alias.
> 
> This patch is to implement user_register_name on ARM.  With this, we can
> handle alias "fp" according to the current frame's mode (ARM or Thumb).
> 
> Regression testing is still running on ARM.  Comments are welcome.

I'm wondering why the ARM back-end actively defines "fp" as user register
anyway.  If it simply were to *not* do so, GDB would fall back to the
default implementation of $fp using value_of_builtin_frame_fp_reg, which
seems to do always the correct thing anyway.  It returns the value of the
frame base as returned by arm_normal_frame_base, which will have been
determined from r11 or r7 as appropriate for the mode.

Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  GNU Toolchain for Linux on System z and Cell BE
  Ulrich.Weigand@de.ibm.com