Import newlib and create makefile

1 files changed, 58 insertions, 0 deletions

diff --git a/newlib/libc/sys/z8ksim/crt0.c b/newlib/libc/sys/z8ksim/crt0.c
new file mode 100644
index 0000000..f9aad6d
--- /dev/null
+++ b/newlib/libc/sys/z8ksim/crt0.c
@@ -0,0 +1,58 @@
+extern char _start_bss;
+extern char _end_bss;
+extern int main(int argc, char **argv, char **environ);
+void __main();
+
+static void
+enter()
+{
+#if defined(__Z8002__)
+  __main();
+#endif
+  exit(main(0,0,0));
+}
+start()
+{
+  char *p;
+#if defined(__Z8002__)
+  asm("ld	r15,#__stack_top");
+  asm("ld	r10,r15");
+#endif
+#if defined(__Z8001__)
+  asm("ldl	rr14,#__stack_top");
+  asm("ldl	rr10,rr14");
+#endif
+
+
+  /* zero bss */
+  p = &_start_bss;
+  while (p < & _end_bss) 
+  {
+    *p++ = 0;
+  }
+  enter();
+}
+
+#if defined(__Z8002__)
+void __do_global_ctors ()
+{
+  typedef void (*pfunc)();
+  extern pfunc __ctors[];
+  extern pfunc __ctors_end[];
+  pfunc *p;
+  for (p = __ctors_end; p > __ctors; )
+    {
+      (*--p)();
+    }
+}
+
+void __main()
+{
+  static int initialized;
+  if (! initialized)
+    {
+      initialized = 1;
+      __do_global_ctors ();
+    }
+}
+#endif