ports: Make all ports skip execution of main.py if boot.py fails.

That can be caused e.g. by an exception.  This feature is implemented in
some way already for the stm32, renesas-ra, mimxrt and samd ports.  This
commit adds it for the rp2, esp8266, esp32 and nrf ports.  No change for
the cc3200 and teensy ports.

Signed-off-by: robert-hh <robert@hammelrath.com>

ports/esp32/main.c

@@ -124,8 +124,11 @@ soft_reset:
 
     // run boot-up scripts
     pyexec_frozen_module("_boot.py", false);
-    pyexec_file_if_exists("boot.py");
-    if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL) {
+    int ret = pyexec_file_if_exists("boot.py");
+    if (ret & PYEXEC_FORCED_EXIT) {
+        goto soft_reset_exit;
+    }
+    if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL && ret != 0) {
         int ret = pyexec_file_if_exists("main.py");
         if (ret & PYEXEC_FORCED_EXIT) {
             goto soft_reset_exit;

ports/esp8266/main.c

@@ -83,8 +83,8 @@ STATIC void mp_reset(void) {
 
     #if MICROPY_MODULE_FROZEN
     pyexec_frozen_module("_boot.py", false);
-    pyexec_file_if_exists("boot.py");
-    if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL) {
+    int ret = pyexec_file_if_exists("boot.py");
+    if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL && ret != 0) {
         pyexec_file_if_exists("main.py");
     }
     #endif

ports/nrf/main.c

@@ -263,8 +263,10 @@ soft_reset:
 
     #if MICROPY_VFS || MICROPY_MBFS || MICROPY_MODULE_FROZEN
     // run boot.py and main.py if they exist.
-    pyexec_file_if_exists("boot.py");
-    pyexec_file_if_exists("main.py");
+    ret = pyexec_file_if_exists("boot.py");
+    if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL && ret != 0) {
+        pyexec_file_if_exists("main.py");
+    }
     #endif
 
     for (;;) {

ports/rp2/main.c

@@ -179,7 +179,7 @@ int main(int argc, char **argv) {
         if (ret & PYEXEC_FORCED_EXIT) {
             goto soft_reset_exit;
         }
-        if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL) {
+        if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL && ret != 0) {
             ret = pyexec_file_if_exists("main.py");
             if (ret & PYEXEC_FORCED_EXIT) {
                 goto soft_reset_exit;