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, 132 insertions, 0 deletions

diff --git a/ext/systemc/src/sysc/qt/md/i386.h b/ext/systemc/src/sysc/qt/md/i386.h
new file mode 100644
index 000000000..04513857e
--- /dev/null
+++ b/ext/systemc/src/sysc/qt/md/i386.h
@@ -0,0 +1,132 @@
+/*
+ * 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_386_H
+#define QUICKTHREADS_386_H
+
+typedef unsigned long qt_word_t;
+
+/* Thread's initial stack layout on the i386:
+
+   non-varargs:
+
+   +---
+   | arg[2]	=== `userf' on startup
+   | arg[1]	=== `pt' on startup
+   | arg[0]	=== `pu' on startup
+   +---
+   | ret pc === qt_error
+   +---
+   | ret pc	=== `only' on startup
+   +---
+   | %ebp
+   | %esi
+   | %edi
+   | %ebx				<--- qt_t.sp
+   +---
+
+   When a non-varargs thread is started, it ``returns'' directly to
+   the client's `only' function.
+
+   varargs:
+
+   +---
+   | arg[n-1]
+   | ..
+   | arg[0]
+   +---
+   | ret pc	=== `qt_vstart'
+   +---
+   | %ebp	=== `startup'
+   | %esi	=== `cleanup'
+   | %edi	=== `pt'
+   | %ebx	=== `vuserf'		<--- qt_t.sp
+   +---
+
+   When a varargs thread is started, it ``returns'' to the `qt_vstart'
+   startup code.  The startup code calls the appropriate functions. */
+
+
+/* What to do to start a varargs thread running. */
+extern void qt_vstart (void);
+
+
+/* Hold 4 saved regs plus two return pcs (qt_error, qt_start) plus
+   three args. */
+#define QUICKTHREADS_STKBASE	(13 * 4)
+
+/* Hold 4 saved regs plus one return pc (qt_vstart). */
+#define QUICKTHREADS_VSTKBASE	(5 * 4)
+
+
+/* Stack must be 16-byte aligned at function call instr. (SSE data support) */
+#define QUICKTHREADS_STKALIGN	(16)
+
+
+/* Where to place various arguments. */
+#define QUICKTHREADS_ONLY_INDEX	(QUICKTHREADS_PC)
+#define QUICKTHREADS_USER_INDEX	(QUICKTHREADS_ARG2)
+#define QUICKTHREADS_ARGT_INDEX	(QUICKTHREADS_ARG1)
+#define QUICKTHREADS_ARGU_INDEX	(QUICKTHREADS_ARG0)
+
+#define QUICKTHREADS_VSTARTUP_INDEX	(QUICKTHREADS_EBP)
+#define QUICKTHREADS_VUSERF_INDEX		(QUICKTHREADS_EBX)
+#define QUICKTHREADS_VCLEANUP_INDEX	(QUICKTHREADS_ESI)
+#define QUICKTHREADS_VARGT_INDEX		(QUICKTHREADS_EDI)
+
+
+#define QUICKTHREADS_EBX        0
+#define QUICKTHREADS_EDI        1
+#define QUICKTHREADS_ESI        2
+#define QUICKTHREADS_EBP        3
+#define QUICKTHREADS_POP0       4
+#define QUICKTHREADS_POP1       5
+#define QUICKTHREADS_POP2       6
+#define QUICKTHREADS_PC         7
+/* The following are defined only for non-varargs. */
+#define QUICKTHREADS_POPE       8
+#define QUICKTHREADS_ARG0       9
+#define QUICKTHREADS_ARG1      10
+#define QUICKTHREADS_ARG2      11
+#define QUICKTHREADS_RPC       12
+
+
+/* Stack grows down.  The top of the stack is the first thing to
+   pop off (preincrement, postdecrement). */
+#define QUICKTHREADS_GROW_DOWN
+
+extern void qt_error (void);
+
+/* For correct 16-byte stack alignment (auto-relocatable functions) */
+extern void qt_tramp (void);
+extern void qt_align (void);
+
+/* Push on the error return address and the alignment/trampoline functions. */
+#define QUICKTHREADS_ARGS_MD(sto) \
+  (QUICKTHREADS_SPUT (sto, QUICKTHREADS_POP0, qt_align), \
+   QUICKTHREADS_SPUT (sto, QUICKTHREADS_POP1, qt_align), \
+   QUICKTHREADS_SPUT (sto, QUICKTHREADS_POP2, qt_align), \
+   QUICKTHREADS_SPUT (sto, QUICKTHREADS_POPE, qt_tramp), \
+   QUICKTHREADS_SPUT (sto, QUICKTHREADS_RPC, qt_error))
+
+
+/* When varargs are pushed, allocate space for all the args. */
+#define QUICKTHREADS_VARGS_MD0(sto, nbytes) \
+  ((qt_t *)(((char *)(sto)) - QUICKTHREADS_STKROUNDUP(nbytes)))
+
+#define QUICKTHREADS_VARGS_MD1(sto) \
+  (QUICKTHREADS_SPUT (sto, QUICKTHREADS_PC, qt_vstart))
+
+#define QUICKTHREADS_VARGS_DEFAULT
+
+#endif /* QUICKTHREADS_386_H */