[PATCH 0/4] Aarch64: Correctly support args passed in float registers.

[Alan Hayward <alan.hayward@arm.com>]

GDB currently does not adhere to the AAPCS spec when passing structures that
contain float arguments. It works for simple structures but does not correctly
detect nested structures.
This is shown by the failing tests in the recently added
infcall-nested-structs.exp. See PR gdb/22943.

Patch 1 contains a new function for correctly detecting float args.
I wrote this by taking the equivalent function in GCC and modifying it until
it fit into GDB, then simplified and cleaned up.
Patches 2 and 3 then use this function.

Patch 4 extends the infcall-nested-structs test to cover structures with 4
and 5 fields - 4 fields is the maximum number of fields that can be passed
via float args.

For the full spec see:
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042f/IHI0042F_aapcs.pdf


Alan Hayward (4):
  Aarch64: Add function to detect args passed in float registers
  Aarch64: Float register detection for _push_dummy_call
  Aarch64: Float register detection for return values.
  infcall-nested-structs: Test up to five fields

 gdb/aarch64-tdep.c                                | 444 ++++++++++++----------
 gdb/testsuite/gdb.base/infcall-nested-structs.c   | 168 +++++---
 gdb/testsuite/gdb.base/infcall-nested-structs.exp |   5 +-
 3 files changed, 366 insertions(+), 251 deletions(-)

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