ArmPkg/CompilerIntrinsicsLib: Add uread, uwrite GCC assembly sources

The new sources are a copy of the RVCT version.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Pete Batard <pete@akeo.ie>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPkg/Library/CompilerIntrinsicsLib/Arm/uread.S

@@ -0,0 +1,54 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#------------------------------------------------------------------------------
+
+#include <AsmMacroIoLib.h>
+
+#
+#UINT32
+#EFIAPI
+#__aeabi_uread4 (
+#  IN VOID   *Pointer
+#  );
+#
+ASM_FUNC(__aeabi_uread4)
+    ldrb    r1, [r0]
+    ldrb    r2, [r0, #1]
+    ldrb    r3, [r0, #2]
+    ldrb    r0, [r0, #3]
+    orr     r1, r1, r2, lsl #8
+    orr     r1, r1, r3, lsl #16
+    orr     r0, r1, r0, lsl #24
+    bx      lr
+
+#
+#UINT64
+#EFIAPI
+#__aeabi_uread8 (
+#  IN VOID   *Pointer
+#  );
+#
+ASM_FUNC(__aeabi_uread8)
+    mov     r3, r0
+
+    ldrb    r1, [r3]
+    ldrb    r2, [r3, #1]
+    orr     r1, r1, r2, lsl #8
+    ldrb    r2, [r3, #2]
+    orr     r1, r1, r2, lsl #16
+    ldrb    r0, [r3, #3]
+    orr     r0, r1, r0, lsl #24
+
+    ldrb    r1, [r3, #4]
+    ldrb    r2, [r3, #5]
+    orr     r1, r1, r2, lsl #8
+    ldrb    r2, [r3, #6]
+    orr     r1, r1, r2, lsl #16
+    ldrb    r2, [r3, #7]
+    orr     r1, r1, r2, lsl #24
+
+    bx      lr

ArmPkg/Library/CompilerIntrinsicsLib/Arm/uwrite.S

@@ -0,0 +1,53 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#------------------------------------------------------------------------------
+
+#include <AsmMacroIoLib.h>
+
+#
+#UINT32
+#EFIAPI
+#__aeabi_uwrite4 (
+#  IN UINT32 Data,
+#  IN VOID   *Pointer
+#  );
+#
+ASM_FUNC(__aeabi_uwrite4)
+    mov     r2, r0, lsr #8
+    strb    r0, [r1]
+    strb    r2, [r1, #1]
+    mov     r2, r0, lsr #16
+    strb    r2, [r1, #2]
+    mov     r2, r0, lsr #24
+    strb    r2, [r1, #3]
+    bx      lr
+
+#
+#UINT64
+#EFIAPI
+#__aeabi_uwrite8 (
+#  IN UINT64 Data,
+#  IN VOID   *Pointer
+#  );
+#
+ASM_FUNC(__aeabi_uwrite8)
+    mov     r3, r0, lsr #8
+    strb    r0, [r2]
+    strb    r3, [r2, #1]
+    mov     r3, r0, lsr #16
+    strb    r3, [r2, #2]
+    mov     r3, r0, lsr #24
+    strb    r3, [r2, #3]
+
+    mov     r3, r1, lsr #8
+    strb    r1, [r2, #4]
+    strb    r3, [r2, #5]
+    mov     r3, r1, lsr #16
+    strb    r3, [r2, #6]
+    mov     r3, r1, lsr #24
+    strb    r3, [r2, #7]
+    bx      lr

ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf

@@ -71,6 +71,8 @@
   Arm/lasr.S           | GCC
   Arm/llsr.S           | GCC
   Arm/llsl.S           | GCC
+  Arm/uread.S          | GCC
+  Arm/uwrite.S         | GCC
 
   Arm/div.asm          | MSFT
   Arm/uldiv.asm        | MSFT