1 files changed, 96 insertions, 0 deletions
diff --git a/app/platform/stm32f0-gcc/startup/startup.cpp b/app/platform/stm32f0-gcc/startup/startup.cpp
new file mode 100644
index 0000000..95276ae
--- /dev/null
+++ b/app/platform/stm32f0-gcc/startup/startup.cpp
@@ -0,0 +1,96 @@
+// very simple startup code with definition of handlers for all cortex-m cores
+
+typedef void (*ptr_func_t)();
+
+// main application
+extern "C" int main();
+
+// location of these variables is defined in linker script
+extern unsigned __data_start;
+extern unsigned __data_end;
+extern unsigned __data_load;
+
+extern unsigned __bss_start;
+extern unsigned __bss_end;
+
+extern unsigned __heap_start;
+
+extern ptr_func_t __preinit_array_start[];
+extern ptr_func_t __preinit_array_end[];
+
+extern ptr_func_t __init_array_start[];
+extern ptr_func_t __init_array_end[];
+
+extern ptr_func_t __fini_array_start[];
+extern ptr_func_t __fini_array_end[];
+
+
+/** Copy default data to DATA section
+ */
+void copy_data() {
+    unsigned *src = &__data_load;
+    unsigned *dst = &__data_start;
+    while (dst < &__data_end) {
+        *dst++ = *src++;
+    }
+}
+
+/** Erase BSS section
+ */
+void zero_bss() {
+    unsigned *dst = &__bss_start;
+    while (dst < &__bss_end) {
+        *dst++ = 0;
+    }
+}
+
+/** Fill heap memory
+ */
+void fill_heap(unsigned fill=0x45455246) {
+    unsigned *dst = &__heap_start;
+    unsigned *msp_reg;
+    __asm__("mrs %0, msp\n" : "=r" (msp_reg) );
+    while (dst < msp_reg) {
+        *dst++ = fill;
+    }
+}
+
+/** Call constructors for static objects
+ */
+void call_init_array() {
+    auto array = __preinit_array_start;
+    while (array < __preinit_array_end) {
+        (*array)();
+        array++;
+    }
+
+    array = __init_array_start;
+    while (array < __init_array_end) {
+        (*array)();
+        array++;
+    }
+}
+
+/** Call destructors for static objects
+ */
+void call_fini_array() {
+    auto array = __fini_array_start;
+    while (array < __fini_array_end) {
+        (*array)();
+        array++;
+    }
+}
+
+// reset handler
+extern "C" void RESET_handler() {
+    copy_data();
+    zero_bss();
+    fill_heap();
+    call_init_array();
+    // run application
+    main();
+    // call destructors for static instances
+    call_fini_array();
+    // stop
+    while (true);
+}