[GHC] #10383: AArch64: get GHC Calling convention working

[GHC]

#10383: AArch64: get GHC Calling convention working
----------------------------------------+----------------------------------
        Reporter:  erikd                |                   Owner:  erikd
            Type:  feature request      |                  Status:  new
        Priority:  normal               |               Milestone:  7.12.1
       Component:  Compiler             |                 Version:  7.11
      Resolution:                       |                Keywords:
Operating System:  Unknown/Multiple     |            Architecture:  aarch64
 Type of failure:  Building GHC failed  |               Test Case:
      Blocked By:                       |                Blocking:
 Related Tickets:                       |  Differential Revisions:
----------------------------------------+----------------------------------

Comment (by erikd):

 I am reasonably certain that this is the same problem as #10375. Running:

 {{{
 inplace/bin/ghc-stage2 +RTS -Ds -Di -Dw -DG -Dg -Db -DS -Dt -Dp -Da -Dl
 -Dm \
        -Dc -Dr
 }}}

 otherwise know as "all the damn debug flags I can find" results in:

 {{{
 stg_ap_v_ret... FUN/1(0x7f99ceba88, 0x7f98f041b9, 0x7f98f05448,
 0x7f98f084c8,
 0x7f98f084d8, 0x7f993cb861, 0x7f98f08558, (nil)d#, (nil)d#, 0x1fd#, 0x4d#,
 0x5d#, 0x6d#)
 stg_ap_0_ret... base:GHC.Event.Manager.Created()
   7f98eff1f0: cap 0: thread 2 stopped (yielding)
   7f98eff1f0: giving up capability 0
   7f98eff1f0: passing capability 0 to bound task 0x7f990ff000
   7f990ff000: woken up on capability 0
   7f990ff000: resuming capability 0
   7f990ff000: cap 0: running thread 1 (ThreadRunGHC)
 Segmentation fault
 }}}

 which just like trac #10375 is GHC crashing in the `schedule` function of
 `rts/Schedule.c` with `what_next == ThreadRunGHC`.

 Will keep this open just in case its not.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10383#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler