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diff --git a/qt/md/sparc.h b/qt/md/sparc.h
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+/*
+ * 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 QT_SPARC_H
+#define QT_SPARC_H
+
+typedef unsigned long qt_word_t;
+
+/* Stack layout on the sparc:
+
+ non-varargs:
+
+ +---
+ | <blank space for alignment>
+ | %o7 == return address -> qt_start
+ | %i7
+ | %i6 == frame pointer -> 0 (NULL-terminated stack frame chain)
+ | %i5 -> only
+ | %i4 -> userf
+ | %i3
+ | %i2 -> pt
+ | %i1 -> pu
+ | %i0
+ | %l7
+ | %l6
+ | %l5
+ | %l4
+ | %l3
+ | %l2
+ | %l1
+ | %l0 <--- qt_t.sp
+ +---
+
+ varargs:
+
+ | :
+ | :
+ | argument list
+ | one-word aggregate return pointer
+ +---
+ | <blank space for alignment>
+ | %o7 == return address -> qt_vstart
+ | %i7
+ | %i6 == frame pointer -> 0 (NULL-terminated stack frame chain)
+ | %i5 -> startup
+ | %i4 -> userf
+ | %i3 -> cleanup
+ | %i2 -> pt
+ | %i1
+ | %i0
+ | %l7
+ | %l6
+ | %l5
+ | %l4
+ | %l3
+ | %l2
+ | %l1
+ | %l0 <--- qt_t.sp
+ +---
+
+ */
+
+
+/* What to do to start a thread running. */
+extern void qt_start (void);
+extern void qt_vstart (void);
+
+
+/* Hold 17 saved registers + 1 word for alignment. */
+#define QT_STKBASE (18 * 4)
+#define QT_VSTKBASE QT_STKBASE
+
+
+/* Stack must be doubleword aligned. */
+#define QT_STKALIGN (8) /* Doubleword aligned. */
+
+#define QT_ONLY_INDEX (QT_I5)
+#define QT_USER_INDEX (QT_I4)
+#define QT_ARGT_INDEX (QT_I2)
+#define QT_ARGU_INDEX (QT_I1)
+
+#define QT_VSTARTUP_INDEX (QT_I5)
+#define QT_VUSERF_INDEX (QT_I4)
+#define QT_VCLEANUP_INDEX (QT_I3)
+#define QT_VARGT_INDEX (QT_I2)
+
+#define QT_O7 (16)
+#define QT_I6 (14)
+#define QT_I5 (13)
+#define QT_I4 (12)
+#define QT_I3 (11)
+#define QT_I2 (10)
+#define QT_I1 ( 9)
+
+
+/* The thread will ``return'' to the `qt_start' routine to get things
+ going. The normal return sequence takes us to QT_O7+8, so we
+ pre-subtract 8. The frame pointer chain is 0-terminated to prevent
+ the trap handler from chasing off in to random memory when flushing
+ stack windows. */
+
+#define QT_ARGS_MD(top) \
+ (QT_SPUT ((top), QT_O7, ((void *)(((int)qt_start)-8))), \
+ QT_SPUT ((top), QT_I6, 0))
+
+
+/* The varargs startup routine always reads 6 words of arguments
+ (6 argument registers) from the stack, offset by one word to
+ allow for an aggregate return area pointer. If the varargs
+ routine actually pushed fewer words than that, qt_vstart could read
+ off the top of the stack. To prevent errors, we always allocate 8
+ words. The space is often just wasted. */
+
+#define QT_VARGS_MD0(sp, vabytes) \
+ ((qt_t *)(((char *)(sp)) - 8*4 - QT_STKROUNDUP(vabytes)))
+
+#define QT_VARGS_MD1(sp) \
+ (QT_SPUT (sp, QT_O7, ((void *)(((int)qt_vstart)-8))))
+
+/* The SPARC has wierdo calling conventions which stores a hidden
+ parameter for returning aggregate values, so the rest of the
+ parameters are shoved up the stack by one place. */
+#define QT_VARGS_ADJUST(sp) (((char *)sp)+4)
+
+#define QT_VARGS_DEFAULT
+
+
+#define QT_GROW_DOWN
+
+#endif /* ndef QT_SPARC_H */