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01: /* Copyright (C) 2001, 2003 Free Software Foundation, Inc.
02:    This file is part of the GNU C Library.
03: 
04:    The GNU C Library is free software; you can redistribute it and/or
05:    modify it under the terms of the GNU Lesser General Public
06:    License as published by the Free Software Foundation; either
07:    version 2.1 of the License, or (at your option) any later version.
08: 
09:    The GNU C Library is distributed in the hope that it will be useful,
10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12:    Lesser General Public License for more details.
13: 
14:    You should have received a copy of the GNU Lesser General Public
15:    License along with the GNU C Library; if not, write to the Free
16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17:    02111-1307 USA.  */
18: 
19: #ifndef _SYS_DEBUGREG_H
20: #define _SYS_DEBUGREG_H 1
21: #include <bits/wordsize.h>
22: 
23: /* Indicate the register numbers for a number of the specific
24:    debug registers.  Registers 0-3 contain the addresses we wish to trap on */
25: #define DR_FIRSTADDR 0        /* u_debugreg[DR_FIRSTADDR] */
26: #define DR_LASTADDR 3         /* u_debugreg[DR_LASTADDR]  */
27: 
28: #define DR_STATUS 6           /* u_debugreg[DR_STATUS]     */
29: #define DR_CONTROL 7          /* u_debugreg[DR_CONTROL] */
30: 
31: /* Define a few things for the status register.  We can use this to determine
32:    which debugging register was responsible for the trap.  The other bits
33:    are either reserved or not of interest to us. */
34: 
35: #define DR_TRAP0        (0x1)           /* db0 */
36: #define DR_TRAP1        (0x2)           /* db1 */
37: #define DR_TRAP2        (0x4)           /* db2 */
38: #define DR_TRAP3        (0x8)           /* db3 */
39: 
40: #define DR_STEP         (0x4000)        /* single-step */
41: #define DR_SWITCH       (0x8000)        /* task switch */
42: 
43: /* Now define a bunch of things for manipulating the control register.
44:    The top two bytes of the control register consist of 4 fields of 4
45:    bits - each field corresponds to one of the four debug registers,
46:    and indicates what types of access we trap on, and how large the data
47:    field is that we are looking at */
48: 
49: #define DR_CONTROL_SHIFT 16   /* Skip this many bits in ctl register */
50: #define DR_CONTROL_SIZE  4    /* 4 control bits per register */
51: 
52: #define DR_RW_EXECUTE   (0x0) /* Settings for the access types to trap on */
53: #define DR_RW_WRITE     (0x1)
54: #define DR_RW_READ      (0x3)
55: 
56: #define DR_LEN_1 (0x0)        /* Settings for data length to trap on */
57: #define DR_LEN_2 (0x4)
58: #define DR_LEN_4 (0xC)
59: #define DR_LEN_8 (0x8)
60: 
61: /* The low byte to the control register determine which registers are
62:    enabled.  There are 4 fields of two bits.  One bit is "local", meaning
63:    that the processor will reset the bit after a task switch and the other
64:    is global meaning that we have to explicitly reset the bit.  With linux,
65:    you can use either one, since we explicitly zero the register when we enter
66:    kernel mode. */
67: 
68: #define DR_LOCAL_ENABLE_SHIFT  0   /* Extra shift to the local enable bit */
69: #define DR_GLOBAL_ENABLE_SHIFT 1   /* Extra shift to the global enable bit */
70: #define DR_ENABLE_SIZE         2   /* 2 enable bits per register */
71: 
72: #define DR_LOCAL_ENABLE_MASK  (0x55) /* Set  local bits for all 4 regs */
73: #define DR_GLOBAL_ENABLE_MASK (0xAA) /* Set global bits for all 4 regs */
74: 
75: /* The second byte to the control register has a few special
76:    things.  */
77: 
78: 
79: 
80: #if __WORDSIZE == 64
81: # define DR_CONTROL_RESERVED (0xFFFFFFFF0000FC00UL) /* Reserved */
82: #else
83: # define DR_CONTROL_RESERVED (0x00FC00U) /* Reserved */
84: #endif
85: #define DR_LOCAL_SLOWDOWN   (0x100)  /* Local slow the pipeline */
86: #define DR_GLOBAL_SLOWDOWN  (0x200)  /* Global slow the pipeline */
87: 
88: #endif  /* sys/debugreg.h */
89: 

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