Xtensa port: Added fields offset support for kernel and thread structures.

Change-Id: I9cc44f60757a2f988e2a6341da9591a5e5f54561
Signed-off-by: Mazen NEIFER <mazen@nestwave.com>

arch/xtensa/core/offsets/offsets.c

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+/*
+ * Copyright (c) 2013-2014 Wind River Systems, Inc.
+ * Copyright (c) 2016 Cadence Design Systems, Inc.
+ * 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
+ *
+ *     http://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.
+ */
+
+/**
+ * @file
+ * @brief Xtensa kernel structure member offset definition file
+ *
+ * This module is responsible for the generation of the absolute symbols whose
+ * value represents the member offsets for various Xtensa nanokernel
+ * structures.
+ *
+ * All of the absolute symbols defined by this module will be present in the
+ * final microkernel or nanokernel ELF image (due to the linker's reference to
+ * the _OffsetAbsSyms symbol).
+ *
+ * INTERNAL
+ * It is NOT necessary to define the offset for every member of a structure.
+ * Typically, only those members that are accessed by assembly language routines
+ * are defined; however, it doesn't hurt to define all fields for the sake of
+ * completeness.
+ */
+
+#include <gen_offset.h> /* located in kernel/arch/common/include */
+
+/* list of headers that define whose structure offsets will be generated */
+
+#include <kernel_structs.h>
+
+#include <kernel_offsets.h>
+
+/* Xtensa-specific TCS structure member offsets */
+GEN_OFFSET_SYM(_callee_saved_t, topOfStack);
+GEN_OFFSET_SYM(_callee_saved_t, retval);
+
+GEN_OFFSET_SYM(_thread_arch_t, preempCoprocReg);
+#if XCHAL_CP_NUM > 0
+GEN_OFFSET_SYM(tPreempCoprocReg, cpStack);
+#endif
+
+/* Xtensa-specific _thread_arch_t structure member offsets */
+GEN_OFFSET_SYM(_thread_arch_t, flags);
+#ifdef CONFIG_SYS_POWER_MANAGEMENT
+GEN_OFFSET_SYM(_thread_arch_t, idle);
+#endif
+
+#ifdef CONFIG_THREAD_CUSTOM_DATA
+GEN_OFFSET_SYM(_thread_arch_t, custom_data);
+#endif
+
+/* Xtensa-specific ESF structure member offsets */
+GEN_OFFSET_SYM(__esf_t, sp);
+GEN_OFFSET_SYM(__esf_t, pc);
+
+/* size of the entire __esf_t structure */
+GEN_ABSOLUTE_SYM(____esf_t_SIZEOF, sizeof(__esf_t));
+
+/* size of the entire preempt registers structure */
+GEN_ABSOLUTE_SYM(__tPreempt_SIZEOF, sizeof(_caller_saved_t));
+
+/* size of the struct tcs structure without save area for coproc regs */
+GEN_ABSOLUTE_SYM(_K_THREAD_NO_FLOAT_SIZEOF,
+		 sizeof(struct k_thread) - sizeof(tCoopCoprocReg) -
+			 sizeof(tPreempCoprocReg));
+
+GEN_ABS_SYM_END

arch/xtensa/include/offsets_short_arch.h

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+/*
+ * Copyright (c) 2016 Wind River Systems, Inc.
+ * Copyright (c) 2016 Cadence Design Systems, Inc.
+ * 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
+ *
+ *     http://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 _offsets_short_arch__h_
+#define _offsets_short_arch__h_
+
+#include <offsets.h>
+
+/* kernel */
+
+#define _kernel_offset_to_flags \
+	(___kernel_t_arch_OFFSET + ___kernel_arch_t_flags_OFFSET)
+
+/* end - kernel */
+
+/* threads */
+
+#define _thread_offset_to_sp \
+	(___thread_t_callee_saved_OFFSET + ___callee_saved_t_topOfStack_OFFSET)
+
+#define _thread_offset_to_retval \
+	(___thread_t_callee_saved_OFFSET + ___callee_saved_t_retval_OFFSET)
+
+#define _thread_offset_to_coopCoprocReg \
+	(___thread_t_arch_OFFSET + ___thread_arch_t_coopCoprocReg_OFFSET)
+
+#define _thread_offset_to_preempCoprocReg \
+	(___thread_t_arch_OFFSET + ___thread_arch_t_preempCoprocReg_OFFSET)
+
+/* end - threads */
+
+#endif /* _offsets_short_arch__h_ */