per reviews: naming, handle "unhandled return" case

Author: d-a-v

cores/esp8266/core_esp8266_postmortem.cpp

@@ -52,6 +52,13 @@ static void uart0_write_char_d(char c);
 static void uart1_write_char_d(char c);
 static void print_stack(uint32_t start, uint32_t end);
 
+// using numbers different from "REASON_" in user_interface.h (=0..6)
+enum rst_reason_sw
+{
+    REASON_USER_SWEXCEPTION_RST = 254
+};
+static int s_user_reset_reason = REASON_DEFAULT_RST;
+
 // From UMM, the last caller of a malloc/realloc/calloc which failed:
 extern void *umm_last_fail_alloc_addr;
 extern int umm_last_fail_alloc_size;
@@ -82,29 +89,24 @@ static void ets_printf_P(const char *str, ...) {
     }
 }
 
-#define USER_REASON_NONE 255
-#define USER_REASON_SWEXCEPTION 254
-// using numbers different from "REASON_" in user_interface.h 0..6
-static int user_reset_reason = USER_REASON_NONE;
-
 void __wrap_system_restart_local() {
     register uint32_t sp asm("a1");
     uint32_t sp_dump = sp;
 
     struct rst_info rst_info;
     memset(&rst_info, 0, sizeof(rst_info));
-    if (user_reset_reason == USER_REASON_NONE)
+    if (s_user_reset_reason == REASON_DEFAULT_RST)
     {
         system_rtc_mem_read(0, &rst_info, sizeof(rst_info));
         if (rst_info.reason != REASON_SOFT_WDT_RST &&
             rst_info.reason != REASON_EXCEPTION_RST &&
             rst_info.reason != REASON_WDT_RST)
         {
-            return;
+            rst_info.reason = REASON_DEFAULT_RST;
         }
     }
     else
-        rst_info.reason = user_reset_reason;
+        rst_info.reason = s_user_reset_reason;
 
     // TODO:  ets_install_putc1 definition is wrong in ets_sys.h, need cast
     ets_install_putc1((void *)&uart_write_char_d);
@@ -129,6 +131,9 @@ void __wrap_system_restart_local() {
     else if (rst_info.reason == REASON_SOFT_WDT_RST) {
         ets_printf_P(PSTR("\nSoft WDT reset\n"));
     }
+    else {
+        ets_printf_P(PSTR("\nGeneric Soft Reset\n"));
+    }
 
     uint32_t cont_stack_start = (uint32_t) &(g_pcont->stack);
     uint32_t cont_stack_end = (uint32_t) g_pcont->stack_end;
@@ -226,7 +231,7 @@ static void raise_exception() {
     if (gdb_present())
         __asm__ __volatile__ ("syscall"); // triggers GDB when enabled
 
-    user_reset_reason = USER_REASON_SWEXCEPTION;
+    s_user_reset_reason = REASON_USER_SWEXCEPTION_RST;
     ets_printf_P(PSTR("\nUser exception (panic/abort/assert)"));
     __wrap_system_restart_local();