feat(esp8266): add non-mask watch dog to panic critical function

components/esp8266/Kconfig

@@ -1,5 +1,15 @@
 menu "ESP8266-specific"
 
+config ESP8266_NMI_WDT
+    bool "Enable non-mask watch dog"
+    default y
+    help
+        Important: this non-mask watch dog is registered to non-mask timer0,
+                   so it can not work together with PWM.
+
+        Enable this non-mask watch dog can help users to debug blocking code
+        when CPU is at critical state(disable interrupt).
+
 choice ESP8266_DEFAULT_CPU_FREQ_MHZ
     prompt "CPU frequency"
     default ESP8266_DEFAULT_CPU_FREQ_160

components/esp8266/driver/ir_tx.c

@@ -29,15 +29,6 @@
 
 static const char *TAG = "ir tx";
 
-#define WDEVTSF0_TIME_LO     0x3ff21004
-#define WDEVTSF0_TIME_HI     0x3ff21008
-#define WDEVTSFSW0_LO        0x3ff21018
-#define WDEVTSFSW0_HI        0x3ff2101C
-#define WDEVTSF0_TIMER_LO    0x3ff2109c
-#define WDEVTSF0_TIMER_HI    0x3ff210a0
-#define WDEVTSF0TIMER_ENA    0x3ff21098
-#define WDEV_TSF0TIMER_ENA   BIT(31)
-
 int wDev_MacTimSetFunc(void (*handle)(void));
 
 #define IR_TX_CHECK(a, str, ret_val) \

components/esp8266/driver/pwm.c

@@ -55,15 +55,6 @@ static const char *TAG = "pwm";
 #define AHEAD_TICKS3 2
 #define MAX_TICKS    10000000ul
 
-#define WDEVTSF0_TIME_LO     0x3ff21004
-#define WDEVTSF0_TIME_HI     0x3ff21008
-#define WDEVTSFSW0_LO        0x3ff21018
-#define WDEVTSFSW0_HI        0x3ff2101C
-#define WDEVTSF0_TIMER_LO    0x3ff2109c
-#define WDEVTSF0_TIMER_HI    0x3ff210a0
-#define WDEVTSF0TIMER_ENA    0x3ff21098
-#define WDEV_TSF0TIMER_ENA   BIT(31)
-
 #define PWM_VERSION          "PWM v3.2"
 
 typedef struct {

components/esp8266/include/esp8266/eagle_soc.h

@@ -146,6 +146,15 @@
 
 #define WDEV_COUNT_REG              (0x3ff20c00)
 
+#define WDEVTSF0_TIME_LO            0x3ff21004
+#define WDEVTSF0_TIME_HI            0x3ff21008
+#define WDEVTSFSW0_LO               0x3ff21018
+#define WDEVTSFSW0_HI               0x3ff2101C
+#define WDEVTSF0_TIMER_LO           0x3ff2109c
+#define WDEVTSF0_TIMER_HI           0x3ff210a0
+#define WDEVTSF0TIMER_ENA           0x3ff21098
+#define WDEV_TSF0TIMER_ENA          BIT(31)
+
 //Watch dog reg {{
 #define PERIPHS_WDT_BASEADDR        0x60000900
 

components/esp8266/source/task_wdt.c

@@ -17,7 +17,9 @@
 #include "esp_log.h"
 #include "esp_libc.h"
 #include "esp_task_wdt.h"
+#include "esp_attr.h"
 #include "portmacro.h"
+#include "esp8266/rom_functions.h"
 #include "esp8266/eagle_soc.h"
 #include "driver/soc.h"
 
@@ -36,6 +38,73 @@ static void esp_task_wdt_isr(void *param)
 }
 #endif
 
+#ifdef CONFIG_ESP8266_NMI_WDT
+
+#if CONFIG_ESP_TASK_WDT_TIMEOUT_S == 13
+#define NMI_WD_TOTAL_PERIOD (6553600)
+#elif CONFIG_ESP_TASK_WDT_TIMEOUT_S == 14
+#define NMI_WD_TOTAL_PERIOD (13107200)
+#elif CONFIG_ESP_TASK_WDT_TIMEOUT_S == 15
+#define NMI_WD_TOTAL_PERIOD (26214400)
+#endif
+
+#define NMI_WD_CHECK_PERIOD (1 * 1000 * 1000)
+
+static int s_nmi_wd_state;
+
+static void nmi_panic_wd(void)
+{
+    extern uint32_t _chip_nmi_cnt;
+    extern uint8_t _chip_nmi_stk[];
+    extern void panicHandler(void *frame, int wdt);
+    uint32_t *p;
+
+    if (_chip_nmi_cnt == 1) {
+        p = (uint32_t *)&_chip_nmi_stk[512];
+    } else {
+        p = (uint32_t *)&_chip_nmi_stk[512 + 124 + 256];
+    }
+
+    panicHandler(p - 1, 1);
+}
+
+static void IRAM_ATTR nmi_set_wd_time(uint32_t us)
+{
+    REG_WRITE(WDEVTSF0TIMER_ENA, REG_READ(WDEVTSF0TIMER_ENA) & (~WDEV_TSF0TIMER_ENA));
+
+    REG_WRITE(WDEVTSFSW0_LO, 0);
+    REG_WRITE(WDEVTSFSW0_HI, 0);
+    REG_WRITE(WDEVTSFSW0_LO, 0);
+
+    REG_WRITE(WDEVTSF0_TIMER_LO, 0);
+    REG_WRITE(WDEVTSF0_TIMER_HI, 0);
+
+    REG_WRITE(WDEVTSF0_TIMER_LO, us);
+
+    REG_WRITE(WDEVTSF0TIMER_ENA, WDEV_TSF0TIMER_ENA);
+}
+
+static void IRAM_ATTR nmi_check_wd(void)
+{
+    switch (s_nmi_wd_state) {
+        case 0:
+            s_nmi_wd_state = 1;
+            nmi_set_wd_time(NMI_WD_CHECK_PERIOD);
+            break;
+        case 1:
+            s_nmi_wd_state = 2;
+            nmi_set_wd_time(NMI_WD_TOTAL_PERIOD - NMI_WD_CHECK_PERIOD);
+            break;
+        case 2:
+            Cache_Read_Enable_New();
+            nmi_panic_wd();
+            break;
+        default:
+            break;
+    }
+}
+#endif
+
 /**
   * @brief  Just for pass compiling and mark wdt calling line
   */
@@ -72,6 +141,15 @@ esp_err_t esp_task_wdt_init(void)
 
     WDT_FEED();
 
+#ifdef CONFIG_ESP8266_NMI_WDT
+    {
+        extern void wDev_MacTimSetFunc(void *func);
+
+        wDev_MacTimSetFunc(nmi_check_wd);;
+        nmi_set_wd_time(NMI_WD_CHECK_PERIOD);
+    }
+#endif
+
     return 0;
 }
 
@@ -82,6 +160,10 @@ esp_err_t esp_task_wdt_init(void)
 void esp_task_wdt_reset(void)
 {
     WDT_FEED();
+
+#ifdef CONFIG_ESP8266_NMI_WDT
+    s_nmi_wd_state = 0;
+#endif
 }
 
 /**

components/freertos/port/esp8266/xtensa_vectors.S

@@ -80,14 +80,14 @@ Add to compile passing.
 #define _INTERRUPT_LEVEL 3
 
 STRUCT_BEGIN
-STRUCT_FIELD (long,4,HESF_,SAR)
-STRUCT_FIELD (long,4,HESF_,EPC1)
-STRUCT_FIELD (long,4,HESF_,EXCCAUSE)
-STRUCT_FIELD (long,4,HESF_,EXCVADDR)
-STRUCT_FIELD (long,4,HESF_,EXCSAVE1)
 STRUCT_FIELD (long,4,HESF_,EPC3)
 STRUCT_FIELD (long,4,HESF_,EPS3)
 STRUCT_AFIELD(long,4,HESF_,AREG, 16)    /* address registers ar0..ar15 */
+STRUCT_FIELD (long,4,HESF_,SAR)
+STRUCT_FIELD (long,4,HESF_,EXCCAUSE)
+STRUCT_FIELD (long,4,HESF_,EPC1)
+STRUCT_FIELD (long,4,HESF_,EXCVADDR)
+STRUCT_FIELD (long,4,HESF_,EXCSAVE1)
 #define HESF_AR(n)  HESF_AREG+((n)*4)
 STRUCT_END(HighPriFrame)
 #define HESF_TOTALSIZE  HighPriFrameSize+32 /* 32 bytes for interrupted code's save areas under SP */