usr/src/uts/common/sys/watchpoint.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 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_WATCHPOINT_H
  28 #define _SYS_WATCHPOINT_H
  29
  30 #include <sys/types.h>
  31 #include <vm/seg_enum.h>
  32 #include <sys/copyops.h>
  33 #include <sys/avl.h>
  34
  35 #ifdef  __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 /*
  40  * Definitions for the VM implementation of watchpoints.
  41  * See proc(4) and <sys/procfs.h> for definitions of the user interface.
  42  */
  43
  44 /*
  45  * Each process with watchpoints has a linked list of watched areas.
  46  * The list is kept sorted by user-level virtual address.
  47  */
  48 typedef struct watched_area {
  49         avl_node_t wa_link;     /* link in AVL tree */
  50         caddr_t wa_vaddr;       /* virtual address of watched area */
  51         caddr_t wa_eaddr;       /* virtual address plus size */
  52         ulong_t wa_flags;       /* watch type flags (see <sys/procfs.h>) */
  53 } watched_area_t;
  54
  55 /*
  56  * The list of watched areas maps into a list of pages with modified
  57  * protections.  The list is kept sorted by user-level virtual address.
  58  */
  59 typedef struct watched_page {
  60         avl_node_t wp_link;     /* Link in AVL tree */
  61         struct watched_page *wp_list;   /* link in p_wprot */
  62         caddr_t wp_vaddr;       /* virtual address of this page */
  63         uchar_t wp_prot;        /* modified protection bits */
  64         uchar_t wp_oprot;       /* original protection bits */
  65         uchar_t wp_umap[3];     /* reference counts of user pr_mappage()s */
  66         uchar_t wp_kmap[3];     /* reference counts of kernel pr_mappage()s */
  67         ushort_t wp_flags;      /* see below */
  68         short   wp_read;        /* number of WA_READ areas in this page */
  69         short   wp_write;       /* number of WA_WRITE areas in this page */
  70         short   wp_exec;        /* number of WA_EXEC areas in this page */
  71 } watched_page_t;
  72
  73 /* wp_flags */
  74 #define WP_NOWATCH      0x01    /* protections temporarily restored */
  75 #define WP_SETPROT      0x02    /* SEGOP_SETPROT() needed on this page */
  76
  77 #ifdef  _KERNEL
  78
  79 /*
  80  * These functions handle the necessary logic to perform the copy operation
  81  * while ignoring watchpoints.
  82  */
  83 extern int copyin_nowatch(const void *, void *, size_t);
  84 extern int copyout_nowatch(const void *, void *, size_t);
  85 extern int fuword32_nowatch(const void *, uint32_t *);
  86 extern int suword32_nowatch(void *, uint32_t);
  87 #ifdef _LP64
  88 extern int suword64_nowatch(void *, uint64_t);
  89 extern int fuword64_nowatch(const void *, uint64_t *);
  90 #endif
  91
  92 /*
  93  * Disable watchpoints for a given region of memory.  When bracketed by these
  94  * calls, functions can use copyops and ignore watchpoints.
  95  */
  96 extern int watch_disable_addr(const void *, size_t, enum seg_rw);
  97 extern void watch_enable_addr(const void *, size_t, enum seg_rw);
  98
  99 /*
 100  * Enable/Disable watchpoints for an entire thread.
 101  */
 102 extern  void    watch_enable(kthread_id_t);
 103 extern  void    watch_disable(kthread_id_t);
 104
 105 struct as;
 106 struct proc;
 107 struct k_siginfo;
 108 extern  void    setallwatch(void);
 109 extern  int     pr_is_watchpage(caddr_t, enum seg_rw);
 110 extern  int     pr_is_watchpage_as(caddr_t, enum seg_rw, struct as *);
 111 extern  int     pr_is_watchpoint(caddr_t *, int *, size_t, size_t *,
 112                         enum seg_rw);
 113 extern  void    do_watch_step(caddr_t, size_t, enum seg_rw, int, greg_t);
 114 extern  int     undo_watch_step(struct k_siginfo *);
 115 extern  int     wp_compare(const void *, const void *);
 116 extern  int     wa_compare(const void *, const void *);
 117
 118 extern  struct copyops watch_copyops;
 119
 120 extern watched_area_t *pr_find_watched_area(struct proc *, watched_area_t *,
 121     avl_index_t *);
 122
 123 #endif
 124
 125 #ifdef  __cplusplus
 126 }
 127 #endif
 128
 129 #endif  /* _SYS_WATCHPOINT_H */