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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.
+ */
+
+/*
+ * This file (pa-risc.h) is part of the port of QuickThreads for the
+ * PA-RISC 1.1 architecture. This file is a machine dependent header
+ * file. It was written in 1994 by Uwe Reder
+ * (`uereder@cip.informatik.uni-erlangen.de') for the Operating Systems
+ * Department (IMMD4) at the University of Erlangen/Nuernberg Germany.
+ */
+
+
+#ifndef QUICKTHREADS_PA_RISC_H
+#define QUICKTHREADS_PA_RISC_H
+
+#if 0
+#include <qt.h>
+#endif
+
+/* size of an integer-register (32 bit) */
+typedef unsigned long qt_word_t;
+
+/* PA-RISC's stack grows up */
+#define QUICKTHREADS_GROW_UP
+
+/* Stack layout on PA-RISC according to PA-RISC Procedure Calling Conventions:
+
+ Callee-save registers are: gr3-gr18, fr12-fr21.
+ Also save gr2, return pointer.
+
+ +---
+ | fr12 Each floating register is a double word (8 bytes).
+ | fr13 Floating registers are only saved if `qt_block' is
+ | fr14 called, in which case it saves the floating-point
+ | fr15 registers then calls `qt_blocki' to save the integer
+ | fr16 registers.
+ | fr17
+ | fr18
+ | fr19
+ | fr20
+ | fr21
+ | <arg word 3> fixed arguments (must be allocated; may remain unused)
+ | <arg word 2>
+ | <arg word 1>
+ | <arg word 0>
+ | <LPT> frame marker
+ | <LPT'>
+ | <RP'>
+ | <Current RP>
+ | <Static Link>
+ | <Clean Up>
+ | <RP''>
+ | <Previous SP>
+ +---
+ | gr3 word each (4 bytes)
+ | gr4
+ | gr5
+ | gr6
+ | gr7
+ | gr8
+ | gr9
+ | gr10
+ | gr11
+ | gr12
+ | gr13
+ | gr14
+ | gr15
+ | gr16
+ | gr17
+ | gr18
+ | <16 bytes filled in (sp has to be 64-bytes aligned)>
+ | <arg word 3> fixed arguments (must be allocated; may remain unused)
+ | <arg word 2>
+ | <arg word 1>
+ | <arg word 0>
+ | <LPT> frame marker
+ | <LPT'>
+ | <RP'>
+ | <Current RP>
+ | <Static Link>
+ | <Clean Up>
+ | <RP''>
+ | <Previous SP>
+ +--- <--- sp
+*/
+
+/* 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. */
+
+/* Note: Procedue Labels on PA-RISC
+
+ <--2--><-------28---------><1-><1->
+ -----------------------------------
+ | SID | Adress Part | L | X |
+ -----------------------------------
+
+ On HP-UX the L field is used to flag wheather the procedure
+ label (plabel) is a pointer to an LT entry or to the entry point
+ of the procedure (PA-RISC Procedure Calling Conventions Reference
+ Manual, 5.3.2 Procedure Labels and Dynamic Calls). */
+
+#define QUICKTHREADS_PA_RISC_READ_PLABEL(plabel) \
+ ( (((int)plabel) & 2) ? \
+ ( (*((int *)(((int)plabel) & 0xfffffffc)))) : ((int)plabel) )
+
+/* Stack must be 64 bytes aligned. */
+#define QUICKTHREADS_STKALIGN (64)
+
+/* Internal helper for putting stuff on stack (negative index!). */
+#define QUICKTHREADS_SPUT(top, at, val) \
+ (((qt_word_t *)(top))[-(at)] = (qt_word_t)(val))
+
+/* Offsets of various registers which are modified on the stack.
+ rp (return-pointer) has to be stored in the frame-marker-area
+ of the "older" stack-segment. */
+
+#define QUICKTHREADS_crp (12+4+16+5)
+#define QUICKTHREADS_15 (12+4+4)
+#define QUICKTHREADS_16 (12+4+3)
+#define QUICKTHREADS_17 (12+4+2)
+#define QUICKTHREADS_18 (12+4+1)
+
+
+/** This stuff is for NON-VARARGS. **/
+
+/* Stack looks like this (2 stack frames):
+
+ <--- 64-bytes aligned --><------- 64-bytes aligned ------------>
+ | || |
+ <--16--><------48-------><----16*4-----><--16-><------48------->
+ || | || | | ||
+ ||filler|arg|frame-marker||register-save|filler|arg|frame-marker||
+ ------------------------------------------------------------------
+ */
+
+#define QUICKTHREADS_STKBASE (16+48+(16*sizeof(qt_word_t))+16+48)
+
+/* The index, relative to sp, of where to put each value. */
+#define QUICKTHREADS_ONLY_INDEX (QUICKTHREADS_15)
+#define QUICKTHREADS_USER_INDEX (QUICKTHREADS_16)
+#define QUICKTHREADS_ARGT_INDEX (QUICKTHREADS_17)
+#define QUICKTHREADS_ARGU_INDEX (QUICKTHREADS_18)
+
+extern void qt_start(void);
+#define QUICKTHREADS_ARGS_MD(sp) \
+ (QUICKTHREADS_SPUT (sp, QUICKTHREADS_crp, QUICKTHREADS_PA_RISC_READ_PLABEL(qt_start)))
+
+
+/** This is for VARARGS. **/
+
+#define QUICKTHREADS_VARGS_DEFAULT
+
+/* Stack looks like this (2 stack frames):
+
+ <------ 64-bytes aligned -------><--------- 64-bytes aligned ---------->
+ | || |
+ <---?--><--?---><16><----32-----><----16*4-----><-16--><16><----32----->
+ || | | | || | | | ||
+ ||filler|varargs|arg|frame-marker||register-save|filler|arg|frame-marker||
+ --------------------------------------------------------------------------
+ */
+
+/* Sp is moved to the end of the first stack frame. */
+#define QUICKTHREADS_VARGS_MD0(sp, vasize) \
+ ((qt_t *)(((char *)sp) + QUICKTHREADS_STKROUNDUP(vasize + 4*4 + 32)))
+
+/* To reach the arguments from the end of the first stack frame use 32
+ as a negative adjustment. */
+#define QUICKTHREADS_VARGS_ADJUST(sp) ((qt_t *)(((char *)sp) - 32))
+
+/* Offset to reach the end of the second stack frame. */
+#define QUICKTHREADS_VSTKBASE ((16*sizeof(qt_word_t)) + 16 + 4*4 + 32)
+
+extern void qt_vstart(void);
+#define QUICKTHREADS_VARGS_MD1(sp) \
+ (QUICKTHREADS_SPUT (sp, QUICKTHREADS_crp, QUICKTHREADS_PA_RISC_READ_PLABEL(qt_vstart)))
+
+#define QUICKTHREADS_VARGT_INDEX (QUICKTHREADS_15)
+#define QUICKTHREADS_VSTARTUP_INDEX (QUICKTHREADS_16)
+#define QUICKTHREADS_VUSERF_INDEX (QUICKTHREADS_17)
+#define QUICKTHREADS_VCLEANUP_INDEX (QUICKTHREADS_18)
+
+#endif /* ndef QUICKTHREADS_PA_RISC_H */
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