ads2gas translates PRESERVE8, REQUIRE8 and ARM directives

Change-Id: I22c547af80e0bce0c7b5f6054ad0aa61f37d717b

build/make/ads2gas.pl

diff --git a/build/make/ads2gas.pl b/build/make/ads2gas.pl
index 388133a..cea967f 100755
--- a/build/make/ads2gas.pl
+++ b/build/make/ads2gas.pl
@@ -126,15 +126,14 @@
     # ALIGN directive
     s/ALIGN/.balign/g;
 
-    # Strip ARM
-    s/\sARM/@ ARM/g;
+    # ARM code
+    s/\sARM/.arm/g;
 
-    # Strip REQUIRE8
-    #s/\sREQUIRE8/@ REQUIRE8/g;
-    s/\sREQUIRE8/@ /g;      #EQU cause problem
+    # REQUIRE8 Stack is required to be 8-byte aligned
+    s/\sREQUIRE8/.eabi_attribute Tag_ABI_align_needed, 1/g;
 
-    # Strip PRESERVE8
-    s/\sPRESERVE8/@ PRESERVE8/g;
+    # PRESERVE8 Stack 8-byte align is preserved
+    s/\sPRESERVE8/.eabi_attribute Tag_ABI_align_preserved, 1/g;
 
     # Use PROC and ENDP to give the symbols a .size directive.
     # This makes them show up properly in debugging tools like gdb and valgrind.