1 files changed, 73 insertions, 0 deletions
diff --git a/libgloss/mn10300/cygmon.c b/libgloss/mn10300/cygmon.c
new file mode 100644
index 000000000..513115cd6
--- /dev/null
+++ b/libgloss/mn10300/cygmon.c
@@ -0,0 +1,73 @@
+/* cygmon.c -- Glue code for linking apps to run on top of Cygmon.
+ *
+ * Copyright (c) 1998, 1999, 2000, 2001 Red Hat, Inc.
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#include <errno.h>
+
+// These need to be kept in sync with the definitions in Cygmon.
+#define SYS_meminfo     1001
+#include "syscall.h"
+
+/* Structure filled in by get_mem_info.  Only the size field is
+   actually used (by sbrk), so the others aren't even filled in.  */
+struct s_mem
+{
+  unsigned int size;
+  unsigned int icsize;
+  unsigned int dcsize;
+};
+
+// Perform a system call.
+// Unused parameters should be set to 0.
+int __trap0(unsigned long func, unsigned long p1, unsigned long p2, unsigned long p3)
+{
+  int ret = 0;
+#ifdef __AM33__
+  {
+    register unsigned long d0 asm ("d0") = func;
+    register unsigned long d1 asm ("d1") = p1;
+    register unsigned long d2 asm ("d2") = p2;
+    register unsigned long d3 asm ("d3") = p3;
+    asm volatile ("    syscall 0\n"
+		  "    nop"
+		  : "+d" (d0) : "d" (d1), "d" (d2), "d" (d3) : "memory");
+    ret = d0;
+  }
+#endif
+
+  if (func == SYS_exit)
+    {
+      while (1)
+        {
+          asm volatile (" .byte 0xff ");  // trigger a breakpoint to drop back into Cygmon
+        }
+    }
+
+  if (ret != 0)
+      errno = ret;
+
+  return ret;
+}
+
+void *
+get_mem_info (mem)
+     struct s_mem *mem;
+{
+  unsigned long totmem = 0, topmem = 0;
+  register int numbanks;
+
+  numbanks = __trap0(SYS_meminfo, (unsigned long)&totmem, (unsigned long)&topmem, 0);
+  mem->size = totmem;
+  return (void*)topmem;
+}