diff options
Diffstat (limited to 'roms/edk2/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memmove.asm')
| -rw-r--r-- | roms/edk2/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memmove.asm | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/roms/edk2/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memmove.asm b/roms/edk2/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memmove.asm new file mode 100644 index 000000000..939b46aee --- /dev/null +++ b/roms/edk2/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memmove.asm @@ -0,0 +1,46 @@ +//------------------------------------------------------------------------------
+//
+// Copyright (c) 2011-2014, ARM Limited. All rights reserved.
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+//------------------------------------------------------------------------------
+
+
+
+ INCLUDE AsmMacroExport.inc
+
+;
+;VOID
+;EFIAPI
+;__aeabi_memmove (
+; IN VOID *Destination,
+; IN CONST VOID *Source,
+; IN UINT32 Size
+; );
+;
+ RVCT_ASM_EXPORT __aeabi_memmove
+ CMP r2, #0
+ BXEQ lr
+ CMP r0, r1
+ BXEQ lr
+ BHI memmove_backward
+
+memmove_forward
+ LDRB r3, [r1], #1
+ STRB r3, [r0], #1
+ SUBS r2, r2, #1
+ BNE memmove_forward
+ BX lr
+
+memmove_backward
+ add r0, r2
+ add r1, r2
+memmove_backward_loop
+ LDRB r3, [r1, #-1]!
+ STRB r3, [r0, #-1]!
+ SUBS r2, r2, #1
+ BNE memmove_backward_loop
+ BX lr
+
+ END
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