usr/src/uts/sparc/v7/sys/machpcb.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1990 by Sun Microsystems, Inc.
  24  */
  25
  26 #ifndef _SYS_MACHPCB_H
  27 #define _SYS_MACHPCB_H
  28
  29 #include <sys/stack.h>
  30 #include <sys/regset.h>
  31 #include <sys/privregs.h>
  32
  33 #ifdef  __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 /*
  38  * This file is machine dependent.
  39  */
  40
  41 /*
  42  * Machine dependent per-thread data.
  43  */
  44 #define MAXWIN  8       /* max # of windows currently supported */
  45
  46 /*
  47  * The system actually supports one more than the above number.
  48  * There is always one window reserved for trap handlers that
  49  * never has to be saved into the pcb struct.
  50  */
  51
  52 /*
  53  * Distance from beginning of thread stack (t_stk) to saved regs struct.
  54  */
  55 #define REGOFF  MINFRAME
  56
  57 #ifndef _ASM
  58
  59 /*
  60  * The struct machpcb is always allocated stack aligned.
  61  */
  62 typedef struct machpcb {
  63         char    mpcb_frame[REGOFF];
  64         struct  regs mpcb_regs; /* user's saved registers */
  65         struct  rwindow mpcb_wbuf[MAXWIN]; /* user window save buffer */
  66         caddr_t mpcb_spbuf[MAXWIN]; /* sp's for each wbuf */
  67         struct  rwindow mpcb_rwin[2]; /* windows used while doing watchpoints */
  68         caddr_t mpcb_rsp[2];    /* sp's for pcb_rwin[]  */
  69         int     mpcb_uwm;       /* user window mask */
  70         int     mpcb_swm;       /* shared user/kernel window mask */
  71         int     mpcb_wbcnt;     /* number of saved windows in pcb_wbuf */
  72         struct  _fpu mpcb_fpu;  /* fpu state */
  73         struct  _fq mpcb_fpu_q[_MAXFPQ]; /* fpu exception queue */
  74         int     mpcb_flags;     /* various state flags */
  75         int     mpcb_wocnt;     /* window overflow count */
  76         int     mpcb_wucnt;     /* window underflow count */
  77         kthread_t *mpcb_thread; /* associated thread */
  78 } machpcb_t;
  79 #endif /* ! _ASM */
  80
  81 /* mpcb_flags */
  82 #define CLEAN_WINDOWS   0x01    /* keep user regs clean */
  83 #define FP_TRAPPED      0x02    /* fp_traps call caused by fp queue */
  84 #define GOTO_SYS_RTT    0x04    /* return from syscall via sys_rtt */
  85
  86
  87 /*
  88  * We can use lwp_regs to find the mpcb base.
  89  */
  90 #ifndef _ASM
  91 #define lwptompcb(lwp)  ((struct machpcb *) \
  92             ((caddr_t)(lwp)->lwp_regs - REGOFF))
  93 #endif
  94
  95 #ifdef  __cplusplus
  96 }
  97 #endif
  98
  99 #endif  /* _SYS_MACHPCB_H */