* Top-level compiler headers will exist in the core folder (no separa…

…te compiler folder is needed).

** The cmsis_compiler.h header will continue to figure out which compiler toolchain is being used.
** Compiler headers specific to each architecture profiles can reside within the new architecture profile folders.
* Introduce compiler abstraction for cortex-R

CMSIS/Core/Include/a-profile/cmsis_clang_a.h

@@ -0,0 +1,161 @@
+/**************************************************************************//**
+ * @file     cmsis_clang_a.h
+ * @brief    CMSIS compiler armclang (Arm Compiler 6) header file
+ * @version  V5.5.0
+ * @date     04. December 2022
+ ******************************************************************************/
+/*
+ * Copyright (c) 2009-2023 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __CMSIS_CLANG_COREA_H
+#define __CMSIS_CLANG_COREA_H
+
+#pragma clang system_header   /* treat file as system include file */
+
+#ifndef __CMSIS_CLANG_H
+  #error "This file must not be included directly"
+#endif
+
+
+/* ###########################  Core Function Access  ########################### */
+/** \ingroup  CMSIS_Core_FunctionInterface
+    \defgroup CMSIS_Core_RegAccFunctions CMSIS Core Register Access Functions
+  @{
+ */
+
+/** \brief  Get CPSR Register
+    \return               CPSR Register value
+ */
+__STATIC_FORCEINLINE uint32_t __get_CPSR(void)
+{
+  uint32_t result;
+  __ASM volatile("MRS %0, cpsr" : "=r" (result) );
+  return(result);
+}
+
+/** \brief  Set CPSR Register
+    \param [in]    cpsr  CPSR value to set
+ */
+__STATIC_FORCEINLINE void __set_CPSR(uint32_t cpsr)
+{
+  __ASM volatile ("MSR cpsr, %0" : : "r" (cpsr) : "cc", "memory");
+}
+
+/** \brief  Get Mode
+    \return                Processor Mode
+ */
+__STATIC_FORCEINLINE uint32_t __get_mode(void)
+{
+  return (__get_CPSR() & 0x1FU);
+}
+
+/** \brief  Set Mode
+    \param [in]    mode  Mode value to set
+ */
+__STATIC_FORCEINLINE void __set_mode(uint32_t mode)
+{
+  __ASM volatile("MSR  cpsr_c, %0" : : "r" (mode) : "memory");
+}
+
+/** \brief  Get Stack Pointer
+    \return Stack Pointer value
+ */
+__STATIC_FORCEINLINE uint32_t __get_SP(void)
+{
+  uint32_t result;
+  __ASM volatile("MOV  %0, sp" : "=r" (result) : : "memory");
+  return result;
+}
+
+/** \brief  Set Stack Pointer
+    \param [in]    stack  Stack Pointer value to set
+ */
+__STATIC_FORCEINLINE void __set_SP(uint32_t stack)
+{
+  __ASM volatile("MOV  sp, %0" : : "r" (stack) : "memory");
+}
+
+/** \brief  Get USR/SYS Stack Pointer
+    \return USR/SYS Stack Pointer value
+ */
+__STATIC_FORCEINLINE uint32_t __get_SP_usr(void)
+{
+  uint32_t cpsr;
+  uint32_t result;
+  __ASM volatile(
+    "MRS     %0, cpsr   \n"
+    "CPS     #0x1F      \n" // no effect in USR mode
+    "MOV     %1, sp     \n"
+    "MSR     cpsr_c, %0 \n" // no effect in USR mode
+    "ISB" :  "=r"(cpsr), "=r"(result) : : "memory"
+   );
+  return result;
+}
+
+/** \brief  Set USR/SYS Stack Pointer
+    \param [in]    topOfProcStack  USR/SYS Stack Pointer value to set
+ */
+__STATIC_FORCEINLINE void __set_SP_usr(uint32_t topOfProcStack)
+{
+  uint32_t cpsr;
+  __ASM volatile(
+    "MRS     %0, cpsr   \n"
+    "CPS     #0x1F      \n" // no effect in USR mode
+    "MOV     sp, %1     \n"
+    "MSR     cpsr_c, %0 \n" // no effect in USR mode
+    "ISB" : "=r"(cpsr) : "r" (topOfProcStack) : "memory"
+   );
+}
+
+/** \brief  Get FPEXC
+    \return               Floating Point Exception Control register value
+ */
+__STATIC_FORCEINLINE uint32_t __get_FPEXC(void)
+{
+#if (__FPU_PRESENT == 1)
+  uint32_t result;
+  __ASM volatile("VMRS %0, fpexc" : "=r" (result) : : "memory");
+  return(result);
+#else
+  return(0);
+#endif
+}
+
+/** \brief  Set FPEXC
+    \param [in]    fpexc  Floating Point Exception Control value to set
+ */
+__STATIC_FORCEINLINE void __set_FPEXC(uint32_t fpexc)
+{
+#if (__FPU_PRESENT == 1)
+  __ASM volatile ("VMSR fpexc, %0" : : "r" (fpexc) : "memory");
+#endif
+}
+
+/** @} end of CMSIS_Core_RegAccFunctions */
+
+
+/*
+ * Include common core functions to access Coprocessor 15 registers
+ */
+
+#define __get_CP(cp, op1, Rt, CRn, CRm, op2) __ASM volatile("MRC p" # cp ", " # op1 ", %0, c" # CRn ", c" # CRm ", " # op2 : "=r" (Rt) : : "memory" )
+#define __set_CP(cp, op1, Rt, CRn, CRm, op2) __ASM volatile("MCR p" # cp ", " # op1 ", %0, c" # CRn ", c" # CRm ", " # op2 : : "r" (Rt) : "memory" )
+#define __get_CP64(cp, op1, Rt, CRm)         __ASM volatile("MRRC p" # cp ", " # op1 ", %Q0, %R0, c" # CRm  : "=r" (Rt) : : "memory" )
+#define __set_CP64(cp, op1, Rt, CRm)         __ASM volatile("MCRR p" # cp ", " # op1 ", %Q0, %R0, c" # CRm  : : "r" (Rt) : "memory" )
+
+#endif /* __CMSIS_CLANG_COREA_H */