shared/runtime/pyexec: Don't allow Ctrl+C to interrupt frozen boot code.

Helps prevent the filesystem from getting formatted by mistake, among other
things.  For example, on a Pico board, entering Ctrl+D and Ctrl+C fast many
times will eventually wipe the filesystem (without warning or notice).

Further rationale: Ctrl+C is used a lot by automation scripts (eg mpremote)
and UI's (eg Mu, Thonny) to get the board into a known state.  If the board
is not responding for a short time then it's not possible to know if it's
just a slow start up (eg in _boot.py), or an infinite loop in the main
application.  The former should not be interrupted, but the latter should.
The only way to distinguish these two cases would be to wait "long enough",
and if there's nothing on the serial after "long enough" then assume it's
running the application and Ctrl+C should break out of it.  But defining
"long enough" is impossible for all the different boards and their possible
behaviour.  The solution in this commit is to make it so that frozen
start-up code cannot be interrupted by Ctrl+C.  That code then effectively
acts like normal C start-up code, which also cannot be interrupted.

Note: on the stm32 port this was never seen as an issue because all
start-up code is in C.  But now other ports start to put more things in
_boot.py and so this problem crops up.

Signed-off-by: David Grayson <[email protected]>

Author: DavidEGrayson

ports/esp32/main.c

@@ -161,7 +161,7 @@ void mp_task(void *pvParameter) {
     #endif
 
     // run boot-up scripts
-    pyexec_frozen_module("_boot.py");
+    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("main.py");

ports/esp8266/main.c

@@ -74,7 +74,7 @@ STATIC void mp_reset(void) {
     }
 
     #if MICROPY_MODULE_FROZEN
-    pyexec_frozen_module("_boot.py");
+    pyexec_frozen_module("_boot.py", false);
     pyexec_file_if_exists("boot.py");
     if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL) {
         pyexec_file_if_exists("main.py");

ports/mimxrt/main.c

@@ -85,7 +85,7 @@ int main(void) {
         readline_init0();
 
         // Execute _boot.py to set up the filesystem.
-        pyexec_frozen_module("_boot.py");
+        pyexec_frozen_module("_boot.py", false);
 
         // Execute user scripts.
         int ret = pyexec_file_if_exists("boot.py");

ports/minimal/main.c

@@ -55,7 +55,7 @@ int main(int argc, char **argv) {
     // do_str("print('hello world!', list(x+1 for x in range(10)), end='eol\\n')", MP_PARSE_SINGLE_INPUT);
     // do_str("for i in range(10):\r\n  print(i)", MP_PARSE_FILE_INPUT);
     #else
-    pyexec_frozen_module("frozentest.py");
+    pyexec_frozen_module("frozentest.py", false);
     #endif
     mp_deinit();
     return 0;

ports/nrf/main.c

@@ -184,7 +184,7 @@ int main(int argc, char **argv) {
     int ret = mp_vfs_mount_and_chdir_protected((mp_obj_t)&nrf_flash_obj, mount_point);
 
     if ((ret == -MP_ENODEV) || (ret == -MP_EIO)) {
-        pyexec_frozen_module("_mkfs.py"); // Frozen script for formatting flash filesystem.
+        pyexec_frozen_module("_mkfs.py", false); // Frozen script for formatting flash filesystem.
         ret = mp_vfs_mount_and_chdir_protected((mp_obj_t)&nrf_flash_obj, mount_point);
     }
 

ports/powerpc/main.c

@@ -95,7 +95,7 @@ int main(int argc, char **argv) {
     pyexec_friendly_repl();
     #endif
     #else
-    pyexec_frozen_module("frozentest.py");
+    pyexec_frozen_module("frozentest.py", false);
     #endif
     mp_deinit();
     return 0;

ports/renesas-ra/main.c

@@ -325,7 +325,7 @@ void ra_main(uint32_t reset_mode) {
 
     // Run optional frozen boot code.
     #ifdef MICROPY_BOARD_FROZEN_BOOT_FILE
-    pyexec_frozen_module(MICROPY_BOARD_FROZEN_BOOT_FILE);
+    pyexec_frozen_module(MICROPY_BOARD_FROZEN_BOOT_FILE, false);
     #endif
 
     // Run boot.py (or whatever else a board configures at this stage).

ports/rp2/main.c

@@ -168,9 +168,9 @@ int main(int argc, char **argv) {
 
         // Execute _boot.py to set up the filesystem.
         #if MICROPY_VFS_FAT && MICROPY_HW_USB_MSC
-        pyexec_frozen_module("_boot_fat.py");
+        pyexec_frozen_module("_boot_fat.py", false);
         #else
-        pyexec_frozen_module("_boot.py");
+        pyexec_frozen_module("_boot.py", false);
         #endif
 
         // Execute user scripts.

ports/samd/main.c

@@ -52,7 +52,7 @@ void samd_main(void) {
         readline_init0();
 
         // Execute _boot.py to set up the filesystem.
-        pyexec_frozen_module("_boot.py");
+        pyexec_frozen_module("_boot.py", false);
 
         // Execute user scripts.
         int ret = pyexec_file_if_exists("boot.py");

ports/stm32/main.c

@@ -559,7 +559,7 @@ void stm32_main(uint32_t reset_mode) {
 
     // Run optional frozen boot code.
     #ifdef MICROPY_BOARD_FROZEN_BOOT_FILE
-    pyexec_frozen_module(MICROPY_BOARD_FROZEN_BOOT_FILE);
+    pyexec_frozen_module(MICROPY_BOARD_FROZEN_BOOT_FILE, false);
     #endif
 
     // Run boot.py (or whatever else a board configures at this stage).