ArmPkg/CompilerIntrinsicsLib: replace memcpy and memset with C code

This replaces the various implementations of memset and memcpy,
including the ARM RTABI ones (__aeabi_mem[set|clr]_[|4|8]) with
a single C implementation for each. The ones we have are either not
very sophisticated (ARM), or they are too sophisticated (memcpy() on
AARCH64, which may perform unaligned accesses) or already coded in C
(memset on AArch64).

The Tianocore codebase mandates the explicit use of its SetMem() and
CopyMem() equivalents, of which various implementations exist for use
in different contexts (PEI, DXE). Few compiler generated references to
these functions should remain, and so our implementations in this BASE
library should be small and usable with the MMU off.

So replace them with a simple C implementation that builds correctly
on GCC/AARCH64, CLANG/AARCH64, GCC/ARM, CLANG/ARM and RVCT/ARM.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

1 files changed, 0 insertions, 50 deletions

diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memset.asm b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memset.asm
deleted file mode 100644
index bae3c1fada..0000000000
--- a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memset.asm
+++ /dev/null
@@ -1,50 +0,0 @@
-//------------------------------------------------------------------------------

-//

-// 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

-// which accompanies this distribution.  The full text of the license may be found at

-// http://opensource.org/licenses/bsd-license.php

-//

-// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,

-// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

-//

-//------------------------------------------------------------------------------

-

-

-    EXPORT  __aeabi_memset

-    EXPORT  __aeabi_memclr

-    EXPORT  __aeabi_memclr4

-

-    AREA    Memset, CODE, READONLY

-

-; void __aeabi_memclr4(void *dest, size_t n);

-; void __aeabi_memclr(void *dest, size_t n);

-__aeabi_memclr

-__aeabi_memclr4

-  mov   r2, #0

-

-;

-;VOID

-;EFIAPI

-;__aeabi_memset (

-; IN  VOID    *Destination,

-; IN  UINT32  Size,

-; IN  UINT32  Character

-; );

-;

-__aeabi_memset

-  cmp  r1, #0

-  bxeq lr

-  ; args = 0, pretend = 0, frame = 0

-  ; frame_needed = 1, uses_anonymous_args = 0

-L10

-  strb  r2, [r0], #1

-  subs  r1, r1, #1

-  ; While size is not 0

-  bne  L10

-  bx   lr

-

-  END