ArmPkg/CompilerIntrinsicesLib: Fixed memmove() and memset()

- Fixed memmove when going backward: the copy started one byte
  after the end of the region to copy
- memset: - removed unused register
          - fixed arguments size and character arguments were
            actually reversed
- Added memmove() to ARM32 GCC

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16328 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Library/CompilerIntrinsicsLib/Arm/memset.S

@@ -1,6 +1,7 @@
 #------------------------------------------------------------------------------
 #
 # Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+# Copyright (c) 2014, ARM Ltd. All rights reserved.<BR>
 #
 # This program and the accompanying materials
 # are licensed and made available under the terms and conditions of the BSD License
@@ -17,22 +18,21 @@
   .align 2
   GCC_ASM_EXPORT (memset)
 
-
+# VOID
+# EFIAPI
+# memset (
+#  IN  VOID    *Destination,
+#  IN  UINT32  Character,
+#  IN  UINT32  Size
+#  );
 ASM_PFX(memset):
-
+  cmp  r2, #0
+  bxeq lr
   @ args = 0, pretend = 0, frame = 0
   @ frame_needed = 1, uses_anonymous_args = 0
-  stmfd  sp!, {r7, lr}
-  mov  ip, #0
-  add  r7, sp, #0
-  mov  lr, r0
-  b  L9
 L10:
-  and  r3, r1, #255
-  add  ip, ip, #1
-  strb  r3, [lr], #1
-L9:
-  cmp  ip, r2
+  strb  r1, [r0], #1
+  subs  r2, r2, #1
+  @ While size is not 0
   bne  L10
-  ldmfd  sp!, {r7, pc}
-
+  bx   lr