1 files changed, 39 insertions, 0 deletions
diff --git a/prog/src/startup.c b/prog/src/startup.c
new file mode 100644
index 0000000..32aa131
--- /dev/null
+++ b/prog/src/startup.c
@@ -0,0 +1,39 @@
+extern unsigned int _sidata; /* Start address for the .data section in ROM */
+extern unsigned int _sdata;  /* Start address for the .data section in RAM */
+extern unsigned int _edata;  /* End address for the .data section in RAM */
+extern unsigned int _sbss;   /* Start address for the .bss section */
+extern unsigned int _ebss;   /* End address for the .bss section */
+extern unsigned int _estack; /* End address for the stack section */
+
+void main(void);             /* The main function declaration */
+void _start(void) __attribute__((section(".text.startup"), naked)); /* The entry point */
+
+void _start(void)
+{
+    unsigned int *src, *dest;
+
+    /* Copy .data section from ROM to RAM */
+    src = &_sidata;  /* ROM address of the .data section */
+    for (dest = &_sdata; dest < &_edata;)
+    {
+        *dest++ = *src++;
+    }
+
+    //while(1);
+
+    /* Zero initialize .bss section */
+    for (dest = &_sbss; dest < &_ebss;)
+    {
+        *dest++ = 0;
+    }
+
+
+    /* Initialize stack pointer */
+    asm volatile ("la sp, _estack");
+
+    /* Call the main function */
+    main();
+
+    /* If main returns, loop forever */
+    while (1);
+}