feat(esp8266): refactor ESP8266(xtensa lx106) panic backtrace function

components/esp8266/include/esp8266/backtrace.h

@@ -0,0 +1,61 @@
+// Copyright 2019-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// 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.
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Check if PC pointer locates at code section
+ * 
+ * @param pc  the PC pointer
+ * 
+ * @return 1 if valid or 0 if invalid 
+ */
+int xt_pc_is_valid(const void *pc);
+
+/**
+ * @brief Detected recursively and serach the previous PC and SP
+ * 
+ * @param i_pc  the PC address for forward recursive detection
+ * @param i_sp  the SP address for forward recursive detection
+ * @param i_lr  the LR address, maybe it the previous PC address
+ * @param o_pc  the detected previous PC address
+ * @param o_pc  the detected previous SP address
+ * 
+ * @return 1 if found or 0 if not found 
+ */
+int xt_retaddr_callee(const void *i_pc, const void *i_sp, const void *i_lr, void **o_pc, void **o_sp);
+
+/**
+ * @brief These functions may be used to get information about the callers of a function.
+ * 
+ *        Using this API instead of "__builtin_return_address".
+ *
+ *        This function returns the return address of the current function, or of one of its callers.
+ *        The level argument is number of frames to scan up the call stack. A value of 0 yields the
+ *        return address of the current function, a value of 1 yields the return address of the caller
+ *        of the current function, and so forth..
+ *        
+ * @param lvl  caller level
+ * 
+ * @return the return address of the current function
+ */
+void *xt_return_address(int lvl);
+
+#ifdef __cplusplus
+}
+#endif

components/esp8266/include/esp8266/eagle_soc.h

@@ -25,7 +25,9 @@
 #ifndef _EAGLE_SOC_H_
 #define _EAGLE_SOC_H_
 
+#include "sdkconfig.h"
 #include <stdint.h>
+#include <stddef.h>
 #include "driver/soc.h"
 
 /* IO definitions (access restrictions to peripheral registers) */
@@ -190,7 +192,7 @@
 #define DRAM_SIZE                       (96 * 1024)
 
 #define IRAM_BASE                       (0x40100000)
-#define IRAM_SIZE                       (48 * 1024)
+#define IRAM_SIZE                       (CONFIG_SOC_IRAM_SIZE)
 
 #define FLASH_BASE                      (0x40200000)
 #define FLASH_SIZE                      (1 * 1024 * 1024)