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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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