Implement support for big endian arm targets.

Adds support for the big endian arm targets by making the target
endianess flag configurable, adding support for the big endian
calling conventions, rewriting memory access patterns and adding
big endian versions of the runtime functions.
Bug 19418

1 files changed, 10 insertions, 8 deletions

diff --git a/arm/Asmexpand.ml b/arm/Asmexpand.ml
index 855ca9ad..43c26f58 100644
--- a/arm/Asmexpand.ml
+++ b/arm/Asmexpand.ml
@@ -185,13 +185,14 @@ let expand_builtin_vload_common chunk base ofs res =
   | Mint32, BR(IR res) ->
      emit (Pldr (res, base, SOimm ofs))
   | Mint64, BR_splitlong(BR(IR res1), BR(IR res2)) ->
-     let ofs' = Int.add ofs _4 in
+     let ofs_hi = if Archi.big_endian then ofs else Int.add ofs _4 in
+     let ofs_lo = if Archi.big_endian then Int.add ofs _4 else ofs in
      if base <> res2 then begin
-	 emit (Pldr (res2, base, SOimm ofs));
-	 emit (Pldr (res1, base, SOimm ofs'))
+	 emit (Pldr (res2, base, SOimm ofs_lo));
+	 emit (Pldr (res1, base, SOimm ofs_hi))
        end else begin
-	 emit (Pldr (res1, base, SOimm ofs'));
-	 emit (Pldr (res2, base, SOimm ofs))
+	 emit (Pldr (res1, base, SOimm ofs_hi));
+	 emit (Pldr (res2, base, SOimm ofs_lo))
        end
   | Mfloat32, BR(FR res) ->
      emit (Pflds (res, base, ofs))
@@ -226,9 +227,10 @@ let expand_builtin_vstore_common chunk base ofs src =
   | Mint32, BA(IR src) ->
      emit (Pstr (src, base, SOimm ofs))
   | Mint64, BA_splitlong(BA(IR src1), BA(IR src2)) ->
-     let ofs' = Int.add ofs _4 in
-     emit (Pstr (src2, base, SOimm ofs));
-     emit (Pstr (src1, base, SOimm ofs'))
+     let ofs_hi = if Archi.big_endian then ofs else Int.add ofs _4 in
+     let ofs_lo = if Archi.big_endian then Int.add ofs _4 else ofs in
+     emit (Pstr (src2, base, SOimm ofs_lo));
+     emit (Pstr (src1, base, SOimm ofs_hi))
   | Mfloat32, BA(FR src) ->
      emit (Pfsts (src, base, ofs))
   | Mfloat64, BA(FR src) ->