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proc.h revision 1.13 
      1 /* $NetBSD: proc.h,v 1.13 2003/09/18 05:26:43 skd Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994, 1995 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #ifndef _ALPHA_PROC_H
     31 #define _ALPHA_PROC_H
     32 
     33 #include <machine/frame.h>
     34 
     35 /* breakpoints for single stepping */
     36 struct mdbpt {
     37 	vaddr_t addr;
     38 	u_int32_t contents;
     39 };
     40 
     41 /*
     42  * Machine-dependent part of the lwp struct for the Alpha.
     43  */
     44 struct mdlwp {
     45 	u_long md_flags;
     46 	struct trapframe *md_tf;	/* trap/syscall registers */
     47 	struct pcb *md_pcbpaddr;	/* phys addr of the pcb */
     48 	struct mdbpt md_sstep[2];   /* two single step breakpoints */
     49 };
     50 /*
     51  * md_flags usage
     52  * --------------
     53  * MDP_FPUSED
     54  * 	A largely unused bit indicating the presence of FPU history.
     55  * 	Cleared on exec. Set but not used by the fpu context switcher
     56  * 	itself.
     57  *
     58  * MDP_FP_C
     59  * 	The architected FP Control word. It should forever begin at bit 1,
     60  * 	as the bits are AARM specified and this way it doesn't need to be
     61  * 	shifted.
     62  *
     63  * 	Until C99 there was never an IEEE 754 API, making most of the
     64  * 	standard useless.  Because of overlapping AARM, OSF/1, NetBSD, and
     65  * 	C99 API's, the use of the MDP_FP_C bits is defined variously in
     66  * 	ieeefp.h and fpu.h.
     67  *
     68  * MDP_STEP1 Single stepping (emulation) is set and the target
     69  *	instruction is not a branch.  md_step[0] contains the destination.
     70  *
     71  * MDP_STEP2 Single stepping (emulation) is set and the target
     72  *	instruction is a branch.  The two breakpoints in the md_step
     73  *	array represent the possible destinations, and both must be
     74  *	cleaned up when the breakpoint trap is taken.
     75  *
     76  */
     77 #define	MDP_FPUSED	0x00000001	/* Process used the FPU */
     78 #define	MDP_FP_C	0x007ffffe	/* Extended FP_C Quadword bits */
     79 #define MDP_STEP1       0x80000000	/* Single step normal instruction */
     80 #define MDP_STEP2       0x40000000      /* Single step branch instruction */
     81 /*
     82  * Machine-dependent part of the proc struct for the Alpha.
     83  */
     84 struct lwp;
     85 struct mdproc {
     86 					/* this process's syscall vector */
     87 	void	(*md_syscall)(struct lwp *, u_int64_t, struct trapframe *);
     88 	__volatile int md_astpending;	/* AST pending for this process */
     89 };
     90 
     91 
     92 #endif /* !_ALPHA_PROC_H_ */
     93