1 files changed, 46 insertions, 0 deletions
diff --git a/retarget.c b/retarget.c
new file mode 100644
index 0000000..3f01076
--- /dev/null
+++ b/retarget.c
@@ -0,0 +1,46 @@
+/*
+** Copyright (C) ARM Limited, 2005. All rights reserved.
+*/
+
+#if defined(__cplusplus)
+#include <cstdio>
+#else
+#include <stdio.h>
+#endif
+#include <rt_misc.h>
+
+// Heap base from scatter file
+extern int Image$$HEAP$$ZI$$Base;
+//#pragma import(__use_two_region_memory)
+
+extern void core_init(void);
+
+/*
+The functions below are patched onto main.
+*/
+
+extern void $Super$$main(void);
+
+void $Sub$$main(void)
+{
+  core_init();                    // does some extra setup work
+
+  $Super$$main();                 // calls the original function
+}
+
+
+/*
+This function re-implements the C Library semihosted function. The stack pointer
+has aready been set and is passed back to the function, The base of the heap is
+set from the scatter file
+*/
+__value_in_regs struct __initial_stackheap __user_initial_stackheap(
+        unsigned R0, unsigned SP, unsigned R2, unsigned SL)
+{
+    struct __initial_stackheap config;
+
+    config.heap_base = (unsigned int)&Image$$HEAP$$ZI$$Base; // placed by scatterfile
+    config.stack_base = SP;   // inherit SP from the execution environment
+
+    return config;
+}