[Patch,Aarch64] Make frame grow downwards

[Christophe Lyon]

Hi,
Following the discussion on
http://gcc.gnu.org/ml/gcc/2013-05/msg00208.html
here is a patch to change the frame direction.

Passed 'make check' with no regression on aarch64-none-linux-gnu and
with a few UNSUPPORTED -> PASS on aarch64-none-elf (pr34225, pr38616,
pr38902, pr40971, pr46440, pr47766, pr49307, all of which are guarded
by dg-require-effective-target fstack_protector).

OK for trunk?

Thanks,

Christophe.
2013-06-28  Christophe Lyon  <christophe.l...@linaro.org>

* config/aarch64/aarch64.h (FRAME_GROWS_DOWNWARD): Define to 1.
* config/aarch64/aarch64.c (aarch64_initial_elimination_offset):
Add get_frame_size () when eliminating frame pointer.

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 527b00d..d8f2801 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -1943,7 +1943,7 @@ aarch64_save_or_restore_callee_save_registers 
(HOST_WIDE_INT offset,
    Establish the stack frame by decreasing the stack pointer with a
    properly calculated size and, if necessary, create a frame record
    filled with the values of LR and previous frame pointer.  The
-   current FP is also set up is it is in use.  */
+   current FP is also set up if it is in use.  */
 
 void
 aarch64_expand_prologue (void)
@@ -4031,7 +4031,7 @@ aarch64_initial_elimination_offset (unsigned from, 
unsigned to)
         return offset - crtl->outgoing_args_size;
 
        if (from == FRAME_POINTER_REGNUM)
-        return cfun->machine->frame.saved_regs_size;
+        return cfun->machine->frame.saved_regs_size + get_frame_size ();
      }
 
    if (to == STACK_POINTER_REGNUM)
@@ -4040,6 +4040,7 @@ aarch64_initial_elimination_offset (unsigned from, 
unsigned to)
          {
            HOST_WIDE_INT elim = crtl->outgoing_args_size
                               + cfun->machine->frame.saved_regs_size
+                              + get_frame_size ()
                               - cfun->machine->frame.fp_lr_offset;
            elim = AARCH64_ROUND_UP (elim, STACK_BOUNDARY / BITS_PER_UNIT);
            return elim;
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index a08797b..5048258 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -434,7 +434,7 @@ enum reg_class
 #define INDEX_REG_CLASS        CORE_REGS
 #define BASE_REG_CLASS  POINTER_REGS
 
-/* Register pairs used to eliminate unneeded registers that point intoi
+/* Register pairs used to eliminate unneeded registers that point into
    the stack frame.  */
 #define ELIMINABLE_REGS                                                        
\
 {                                                                      \
@@ -475,7 +475,7 @@ extern enum aarch64_processor aarch64_tune;
 /* Stack layout; function entry, exit and calling.  */
 #define STACK_GROWS_DOWNWARD   1
 
-#define FRAME_GROWS_DOWNWARD   0
+#define FRAME_GROWS_DOWNWARD   1
 
 #define STARTING_FRAME_OFFSET  0