ext: Include SystemC 2.3.1 into gem5

In the past it happened several times that some changes in gem5 broke the
SystemC coupling. Recently Accelera has changed the licence for SystemC
from their own licence to Apache2.0, which is compatible with gem5.
However, SystemC usually relies on the Boost library, but I was able to
exchange the boost calls by c++11 alternatives. The recent SystemC version
is placed into /ext and is integrated into gem5's build system. The goal is
to integrate some SystemC tests for the CI in some following patches.

Change-Id: I4b66ec806b5e3cffc1d7c85d3735ff4fa5b31fd0
Reviewed-on: https://gem5-review.googlesource.com/2240
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/ext/systemc/src/sysc/qt/md/vax.h b/ext/systemc/src/sysc/qt/md/vax.h
new file mode 100644
index 000000000..1948c6fbd
--- /dev/null
+++ b/ext/systemc/src/sysc/qt/md/vax.h
@@ -0,0 +1,130 @@
+/*
+ * QuickThreads -- Threads-building toolkit.
+ * Copyright (c) 1993 by David Keppel
+ *
+ * Permission to use, copy, modify and distribute this software and
+ * its documentation for any purpose and without fee is hereby
+ * granted, provided that the above copyright notice and this notice
+ * appear in all copies.  This software is provided as a
+ * proof-of-concept and for demonstration purposes; there is no
+ * representation about the suitability of this software for any
+ * purpose.
+ */
+
+#ifndef QUICKTHREADS_VAX_H
+#define QUICKTHREADS_VAX_H
+
+typedef unsigned long qt_word_t;
+
+/* Thread's initial stack layout on the VAX:
+
+   non-varargs:
+
+   +---
+   | arg[2]	=== `userf' on startup
+   | arg[1]	=== `pt' on startup
+   | arg[0]	=== `pu' on startup
+   | ...	=== `only' on startup.
+   +---
+   | ret pc	=== `qt_start' on startup
+   | fp		=== 0 on startup
+   | ap		=== 0 on startup
+   | <mask>
+   | 0 (handler)			<--- qt_t.sp
+   +---
+
+   When a non-varargs thread is started, it ``returns'' to the start
+   routine, which calls the client's `only' function.
+
+   The varargs case is clearly bad code.  The various values should be
+   stored in a save area and snarfed in to callee-save registers on
+   startup.  However, it's too painful to figure out the register
+   mask (right now), so do it the slow way.
+
+   +---
+   | arg[n-1]
+   | ..
+   | arg[0]
+   | nargs
+   +---
+   |		=== `cleanup'
+   |		=== `vuserf'
+   |		=== `startup'
+   |		=== `pt'
+   +---
+   | ret pc	=== `qt_start' on startup
+   | fp		=== 0 on startup
+   | ap		=== 0 on startup
+   | <mask>
+   | 0 (handler)			<--- qt_t.sp
+   +---
+
+   When a varargs thread is started, it ``returns'' to the `qt_vstart'
+   startup code.  The startup code pops all the extra arguments, then
+   calls the appropriate functions. */
+
+
+/* What to do to start a thread running. */
+extern void qt_start (void);
+extern void qt_vstart (void);
+
+
+/* Initial call frame for non-varargs and varargs cases. */
+#define QUICKTHREADS_STKBASE	(10 * 4)
+#define QUICKTHREADS_VSTKBASE	(9 * 4)
+
+
+/* Stack "must be" 4-byte aligned.  (Actually, no, but it's
+   easiest and probably fastest to do so.) */
+
+#define QUICKTHREADS_STKALIGN	(4)
+
+
+/* Where to place various arguments. */
+#define QUICKTHREADS_ONLY_INDEX	(5)
+#define QUICKTHREADS_USER_INDEX	(8)
+#define QUICKTHREADS_ARGT_INDEX	(7)
+#define QUICKTHREADS_ARGU_INDEX	(6)
+
+#define QUICKTHREADS_VSTARTUP_INDEX	(6)
+#define QUICKTHREADS_VUSERF_INDEX		(7)
+#define QUICKTHREADS_VCLEANUP_INDEX	(8)
+#define QUICKTHREADS_VARGT_INDEX		(5)
+
+
+/* Stack grows down.  The top of the stack is the first thing to
+   pop off (predecrement, postincrement). */
+#define QUICKTHREADS_GROW_DOWN
+
+
+extern void qt_error (void);
+
+#define QUICKTHREADS_VAX_GMASK_NOREGS	(0)
+
+/* Push on the error return address, null termination to call chains,
+   number of arguments to `only', register save mask (save no
+   registers). */
+
+#define QUICKTHREADS_ARGS_MD(sto) \
+    (QUICKTHREADS_SPUT (sto, 0, 0), \
+     QUICKTHREADS_SPUT (sto, 1, QUICKTHREADS_VAX_GMASK_NOREGS), \
+     QUICKTHREADS_SPUT (sto, 2, 0), \
+     QUICKTHREADS_SPUT (sto, 3, 0), \
+     QUICKTHREADS_SPUT (sto, 4, qt_start))
+
+#define QUICKTHREADS_VARGS_MD0(sto, nbytes) \
+    (QUICKTHREADS_SPUT (sto, (-(nbytes)/4)-1, (nbytes)/4), \
+     ((char *)(((sto)-4) - QUICKTHREADS_STKROUNDUP(nbytes))))
+
+#define QUICKTHREADS_VARGS_ADJUST(sp)	((char *)sp + 4)
+
+#define QUICKTHREADS_VARGS_MD1(sto) \
+    (QUICKTHREADS_SPUT (sto, 0, 0), \
+     QUICKTHREADS_SPUT (sto, 1, QUICKTHREADS_VAX_GMASK_NOREGS), \
+     QUICKTHREADS_SPUT (sto, 2, 0), \
+     QUICKTHREADS_SPUT (sto, 3, 0), \
+     QUICKTHREADS_SPUT (sto, 4, qt_vstart))
+
+#define QUICKTHREADS_VARGS_DEFAULT
+
+#endif /* QUICKTHREADS_VAX_H */