1 files changed, 57 insertions, 0 deletions
diff --git a/libgloss/m68k/bdm-semihost.h b/libgloss/m68k/bdm-semihost.h
new file mode 100644
index 000000000..4d6e2b9cc
--- /dev/null
+++ b/libgloss/m68k/bdm-semihost.h
@@ -0,0 +1,57 @@
+/*
+ * bdm semihosting support.
+ *
+ * Copyright (c) 2006 CodeSourcery 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.
+ */
+
+/* Semihosting uses a user trap handler containing a HALT
+   instruction.  This wakes the debugger to perform some action.  */
+
+/* This is the semihosting trap hander */
+#define BDM_TRAPNUM 15
+
+/* This register holds the function enumeration for a semihosting
+   command.  */
+#define BDM_FUNC_REG "d0"
+
+/* This register holds the argument for the semihosting call.  For most
+   functions, this is a pointer to a block of memory that holds the input
+   and output parameters for the remote file i/o operation.  */
+#define BDM_ARG_REG  "d1"
+
+/* Codes for BDM_FUNC_REG.  */
+
+#define BDM_EXIT  0
+#define BDM_PUTCHAR 1 /* Obsolete */
+#define BDM_OPEN 2
+#define BDM_CLOSE 3
+#define BDM_READ 4
+#define BDM_WRITE 5
+#define BDM_LSEEK 6
+#define BDM_RENAME 7
+#define BDM_UNLINK 8
+#define BDM_STAT 9
+#define BDM_FSTAT 10
+#define BDM_GETTIMEOFDAY 11
+#define BDM_ISATTY 12
+#define BDM_SYSTEM 13
+
+/* Here is the macro that generates the trap. */
+
+#define BDM_TRAP(func, arg) \
+  __asm__ __volatile__ ("move.l %0,%/" BDM_ARG_REG "\n" \
+			"moveq %1,%/" BDM_FUNC_REG "\n" \
+			"trap %2" \
+			:: "rmi" (arg), "n" (func), "n" (BDM_TRAPNUM) \
+			: BDM_FUNC_REG,BDM_ARG_REG,"memory")
+