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reg.h revision 1.11 
      1 /*	$NetBSD: reg.h,v 1.11 2018/01/15 10:06:49 martin Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * All advertising materials mentioning features or use of this software
     12  * must display the following acknowledgement:
     13  *	This product includes software developed by the University of
     14  *	California, Lawrence Berkeley Laboratory.
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  * 3. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  *	@(#)reg.h	8.1 (Berkeley) 6/11/93
     41  */
     42 
     43 #ifndef _MACHINE_REG_H_
     44 #define	_MACHINE_REG_H_
     45 
     46 /*
     47  * Registers passed to trap/syscall/etc.
     48  * This structure is known to occupy exactly 80 bytes (see locore.s).
     49  * Note, tf_global[0] is not actually written (since g0 is always 0).
     50  * (The slot tf_global[0] is used to send a copy of %wim to kernel gdb.
     51  * This is known as `cheating'.)
     52  */
     53 struct trapframe {
     54 	int	tf_psr;		/* psr */
     55 	int	tf_pc;		/* return pc */
     56 	int	tf_npc;		/* return npc */
     57 	int	tf_y;		/* %y register */
     58 	int	tf_global[8];	/* global registers in trap's caller */
     59 	int	tf_out[8];	/* output registers in trap's caller */
     60 };
     61 
     62 /*
     63  * Register windows.  Each stack pointer (%o6 aka %sp) in each window
     64  * must ALWAYS point to some place at which it is safe to scribble on
     65  * 64 bytes.  (If not, your process gets mangled.)  Furthermore, each
     66  * stack pointer should be aligned on an 8-byte boundary (the kernel
     67  * as currently coded allows arbitrary alignment, but with a hefty
     68  * performance penalty).
     69  */
     70 struct rwindow {
     71 	int	rw_local[8];		/* %l0..%l7 */
     72 	int	rw_in[8];		/* %i0..%i7 */
     73 };
     74 
     75 /*
     76  * Clone trapframe for now; this seems to be the more useful
     77  * than the old struct reg above.
     78  */
     79 struct reg {
     80 	int	r_psr;		/* psr */
     81 	int	r_pc;		/* return pc */
     82 	int	r_npc;		/* return npc */
     83 	int	r_y;		/* %y register */
     84 	int	r_global[8];	/* global registers in trap's caller */
     85 	int	r_out[8];	/* output registers in trap's caller */
     86 };
     87 
     88 #include <machine/fsr.h>
     89 
     90 /*
     91  * FP coprocessor registers.
     92  *
     93  * FP_QSIZE is the maximum coprocessor instruction queue depth
     94  * of any implementation on which the kernel will run.  David Hough:
     95  * ``I'd suggest allowing 16 ... allowing an indeterminate variable
     96  * size would be even better''.  Of course, we cannot do that; we
     97  * need to malloc these.
     98  */
     99 #define	FP_QSIZE	16
    100 
    101 struct fp_qentry {
    102 	int	*fq_addr;		/* the instruction's address */
    103 	int	fq_instr;		/* the instruction itself */
    104 };
    105 
    106 struct fpreg {
    107 	u_int	fr_regs[32];		/* our view is 32 32-bit registers */
    108 	int	fr_fsr;			/* %fsr */
    109 };
    110 
    111 struct fpstate {
    112 	struct fpreg fs_reg;
    113 #define fs_regs fs_reg.fr_regs
    114 #define fs_fsr	fs_reg.fr_fsr
    115 	int	fs_qsize;		/* actual queue depth */
    116 	struct	fp_qentry fs_queue[FP_QSIZE];	/* queue contents */
    117 }
    118 #ifdef _KERNEL
    119  __aligned(8)				/* asm code uses std instructions */
    120 #endif
    121 ;
    122 
    123 /*
    124  * The actual FP registers are made accessible (c.f. ptrace(2)) through
    125  * a `struct fpreg'; <arch/sparc/sparc/process_machdep.c> relies on the
    126  * fact that `fpreg' is a prefix of `fpstate'.
    127  */
    128 
    129 #endif /* _MACHINE_REG_H_ */
    130