cm_backtrace: slim down RAM making strings const

Former-commit-id: 2037382

Author: facchinm

cores/arduino/cm_backtrace/cm_backtrace.c

@@ -117,9 +117,9 @@ static const char * const print_info[] = {
 #endif
 };
 
-static char fw_name[128] = {0};
-static char hw_ver[CMB_NAME_MAX] = {0};
-static char sw_ver[CMB_NAME_MAX] = {0};
+static char* fw_name;
+static char* hw_ver;
+static char* sw_ver;
 static uint32_t main_stack_start_addr = 0;
 static size_t main_stack_size = 0;
 static uint32_t code_start_addr = 0;
@@ -141,9 +141,9 @@ static bool on_thread_before_fault = false;
  * library initialize
  */
 void cm_backtrace_init(const char *firmware_name, const char *hardware_ver, const char *software_ver) {
-    strncpy(fw_name, firmware_name, CMB_NAME_MAX);
-    strncpy(hw_ver, hardware_ver, CMB_NAME_MAX);
-    strncpy(sw_ver, software_ver, CMB_NAME_MAX);
+    fw_name = firmware_name;
+    hw_ver = hardware_ver;
+    sw_ver = software_ver;
 
 #if defined(__ARMCC_VERSION)
     main_stack_start_addr = (uint32_t)&CSTACK_BLOCK_START(CMB_CSTACK_BLOCK_NAME);

cores/arduino/main.cpp

@@ -100,7 +100,7 @@ void arduino_main(void)
 #ifdef BACKTRACE_SUPPORT
    // "install" stacktrace print over Hardfault handler
    *(irq_vector_table + 3) = (uint32_t)Stacktrace_Handler;
-   cm_backtrace_init(stringify(PROJECT_NAME), "RA", __DATE__);
+   cm_backtrace_init(stringify(PROJECT_NAME), "RA", __DATE__ "\0");
 #endif
 
    _init();