Hi,

Attached is a re-spin for the AArch64 basic port addressing comments 
received here:

http://www.sourceware.org/ml/gdb-patches/2013-01/msg00611.html

Responses to the questions raised in that email below:

 >>
 >>    >>  +  if (tdep->jb_pc>= 0)
 >>    >>  +    set_gdbarch_get_longjmp_target (gdbarch,
 >> aarch64_get_longjmp_target);
 >>    >
 >>    >  Have you answered the comment I made in my first review? I can't
 >>    >  find anything...
 >>
 >> Between the initial definition of jb_pc and this conditional is a 
call to gdbarch_init_osabi() both the aarch64-linux-tdep.c and 
aarch64-newlib-tdep.c contain an initializer that re-defines jb_pc.
 >
 > So the default, non-default-osabi implementation uses which libc?

By default we are not assuming any specific libc and hence not 
installing a longjmp handler via set_gdbarch_get_longjmp_target.


 >> +
 >> +/* Implement the "addr_bits_remove" gdbarch method.  */
 >> +
 >> +static CORE_ADDR
 >> +aarch64_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val)
 >> +{
 >> +  /* All instructions are 4-byte aligned.  */
 >> +  return val & ~(CORE_ADDR) 0x3;
 >> +}
 >
 > Excuse the ignorance, but why do you need this?  Does
 > Aarch64 do any magic low address encoding, like arm/thumb?

In the AArch64 execution state all instructions are 4 byte aligned with 
the least significant two bits reserved.

Proposed ChangeLog:

2013-01-25  Jim MacArthur  <jim.macarthur@arm.com>
             Marcus Shawcroft  <marcus.shawcroft@arm.com>
             Nigel Stephens  <nigel.stephens@arm.com>
             Yufeng Zhang  <yufeng.zhang@arm.com>

         * Makefile.in (ALL_64_TARGET_OBS): Add arch64-tdep.o.
         (HFILES_NO_SRCDIR): Add aarch64-tdep.h.
         (ALLDEPFILES): Add aarch64-tdep.c.
         * aarch64-tdep.c: New file.
         * aarch64-tdep.h: New file.
         * configure.tgt: Add AArch64.
         * features/Makefile (WHICH): Add aarch64 and aarch64-without-fpu.
         (aarch64-expedite): New definition.
         * features/aarch64-core.xml: New file.
         * features/aarch64-fpu.xml: New file.
         * features/aarch64-without-fpu.c: New file (generated).
         * features/aarch64-without-fpu.xml: New file.
         * features/aarch64.c: New file (generated).
         * features/aarch64.xml: New file.
         * regformats/aarch64-without-fpu.dat: New file (generated).
         * regformats/aarch64.dat: New file (generated).

Cheers
/Marcus