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-rw-r--r--qt/md/mips.h134
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diff --git a/qt/md/mips.h b/qt/md/mips.h
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--- a/qt/md/mips.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_MIPS_H
-#define QT_MIPS_H
-
-typedef unsigned long qt_word_t;
-
-#define QT_GROW_DOWN
-
-/* Stack layout on the mips:
-
- Callee-save registers are: $16-$23, $30; $f20-$f30.
- Also save $31, return pc.
-
- Non-varargs:
-
- +---
- | $f30 The first clump is only saved if `qt_block'
- | $f28 is called, in which case it saves the fp regs
- | $f26 then calls `qt_blocki' to save the int regs.
- | $f24
- | $f22
- | $f20
- | $31 === return pc in `qt_block'
- +---
- | $31 === return pc; on startup == qt_start
- | $30
- | $23
- | $22
- | $21
- | $20
- | $19 on startup === only
- | $18 on startup === $a2 === userf
- | $17 on startup === $a1 === pt
- | $16 on startup === $a0 === pu
- | <a3> save area req'd by MIPS calling convention
- | <a2> save area req'd by MIPS calling convention
- | <a1> save area req'd by MIPS calling convention
- | <a0> save area req'd by MIPS calling convention <--- sp
- +---
-
- Conventions for varargs:
-
- | args ...
- +---
- | :
- | :
- | $21
- | $20
- | $19 on startup === `userf'
- | $18 on startup === `startup'
- | $17 on startup === `pt'
- | $16 on startup === `cleanup'
- | <a3>
- | <a2>
- | <a1>
- | <a0> <--- sp
- +---
-
- Note: if we wanted to, we could muck about and try to get the 4
- argument registers loaded in to, e.g., $22, $23, $30, and $31,
- and the return pc in, say, $20. Then, the first 4 args would
- not need to be loaded from memory, they could just use
- register-to-register copies. */
-
-
-/* Stack must be doubleword aligned. */
-#define QT_STKALIGN (8) /* Doubleword aligned. */
-
-/* How much space is allocated to hold all the crud for
- initialization: $16-$23, $30, $31. Just do an integer restore,
- no need to restore floating-point. Four words are needed for the
- argument save area for the helper function that will be called for
- the old thread, just before the new thread starts to run. */
-
-#define QT_STKBASE (14 * 4)
-#define QT_VSTKBASE QT_STKBASE
-
-
-/* Offsets of various registers. */
-#define QT_31 (9+4)
-#define QT_19 (3+4)
-#define QT_18 (2+4)
-#define QT_17 (1+4)
-#define QT_16 (0+4)
-
-
-/* When a never-before-run thread is restored, the return pc points
- to a fragment of code that starts the thread running. For
- non-vargs functions, it just calls the client's `only' function.
- For varargs functions, it calls the startup, user, and cleanup
- functions.
-
- The varargs startup routine always reads 4 words of arguments from
- the stack. If there are less than 4 words of arguments, then the
- startup routine can read off the top of the stack. To prevent
- errors we always allocate 4 words. If there are more than 3 words
- of arguments, the 4 preallocated words are simply wasted. */
-
-extern void qt_start(void);
-#define QT_ARGS_MD(sp) (QT_SPUT (sp, QT_31, qt_start))
-
-#define QT_VARGS_MD0(sp, vabytes) \
- ((qt_t *)(((char *)(sp)) - 4*4 - QT_STKROUNDUP(vabytes)))
-
-extern void qt_vstart(void);
-#define QT_VARGS_MD1(sp) (QT_SPUT (sp, QT_31, qt_vstart))
-
-#define QT_VARGS_DEFAULT
-
-
-/* The *index* (positive offset) of where to put each value. */
-#define QT_ONLY_INDEX (QT_19)
-#define QT_USER_INDEX (QT_18)
-#define QT_ARGT_INDEX (QT_17)
-#define QT_ARGU_INDEX (QT_16)
-
-#define QT_VCLEANUP_INDEX (QT_16)
-#define QT_VUSERF_INDEX (QT_19)
-#define QT_VSTARTUP_INDEX (QT_18)
-#define QT_VARGT_INDEX (QT_17)
-
-#endif /* ndef QT_MIPS_H */