automate crash for GDBStub

Author: d-a-v

cores/esp8266/core_esp8266_postmortem.c

@@ -45,6 +45,8 @@ static void uart1_write_char_d(char c);
 static void print_stack(uint32_t start, uint32_t end);
 //static void print_pcs(uint32_t start, uint32_t end);
 
+bool __attribute((weak)) crash_for_gdb = 0;
+
 extern void __custom_crash_callback( struct rst_info * rst_info, uint32_t stack, uint32_t stack_end ) {
     (void) rst_info;
     (void) stack;
@@ -54,6 +56,7 @@ extern void __custom_crash_callback( struct rst_info * rst_info, uint32_t stack,
 extern void custom_crash_callback( struct rst_info * rst_info, uint32_t stack, uint32_t stack_end ) __attribute__ ((weak, alias("__custom_crash_callback")));
 
 void __wrap_system_restart_local() {
+    if (crash_for_gdb) *((int*)0) = 0;
     register uint32_t sp asm("a1");
 
     struct rst_info rst_info = {0};

libraries/GDBStub/src/GDBStub.h

@@ -3,4 +3,6 @@
 
 // this header is intentionally left blank
 
+bool crash_for_gdb = 1;
+
 #endif //GDBSTUB_H