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b168057a | 1 | /* Copyright (C) 2001-2015 Free Software Foundation, Inc. |
d987f926 AJ |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | 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 | |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
d987f926 AJ |
17 | |
18 | #ifndef _SYS_DEBUGREG_H | |
19 | #define _SYS_DEBUGREG_H 1 | |
20 | ||
21 | /* Indicate the register numbers for a number of the specific | |
22 | debug registers. Registers 0-3 contain the addresses we wish to trap on */ | |
23 | #define DR_FIRSTADDR 0 /* u_debugreg[DR_FIRSTADDR] */ | |
24 | #define DR_LASTADDR 3 /* u_debugreg[DR_LASTADDR] */ | |
25 | ||
26 | #define DR_STATUS 6 /* u_debugreg[DR_STATUS] */ | |
27 | #define DR_CONTROL 7 /* u_debugreg[DR_CONTROL] */ | |
28 | ||
29 | /* Define a few things for the status register. We can use this to determine | |
30 | which debugging register was responsible for the trap. The other bits | |
31 | are either reserved or not of interest to us. */ | |
32 | ||
33 | #define DR_TRAP0 (0x1) /* db0 */ | |
34 | #define DR_TRAP1 (0x2) /* db1 */ | |
35 | #define DR_TRAP2 (0x4) /* db2 */ | |
36 | #define DR_TRAP3 (0x8) /* db3 */ | |
37 | ||
38 | #define DR_STEP (0x4000) /* single-step */ | |
39 | #define DR_SWITCH (0x8000) /* task switch */ | |
40 | ||
41 | /* Now define a bunch of things for manipulating the control register. | |
42 | The top two bytes of the control register consist of 4 fields of 4 | |
43 | bits - each field corresponds to one of the four debug registers, | |
44 | and indicates what types of access we trap on, and how large the data | |
45 | field is that we are looking at */ | |
46 | ||
47 | #define DR_CONTROL_SHIFT 16 /* Skip this many bits in ctl register */ | |
48 | #define DR_CONTROL_SIZE 4 /* 4 control bits per register */ | |
49 | ||
50 | #define DR_RW_EXECUTE (0x0) /* Settings for the access types to trap on */ | |
51 | #define DR_RW_WRITE (0x1) | |
52 | #define DR_RW_READ (0x3) | |
53 | ||
54 | #define DR_LEN_1 (0x0) /* Settings for data length to trap on */ | |
55 | #define DR_LEN_2 (0x4) | |
56 | #define DR_LEN_4 (0xC) | |
3553723f L |
57 | #ifdef __x86_64__ |
58 | # define DR_LEN_8 (0x8) | |
59 | #endif | |
d987f926 AJ |
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. */ | |
2ece7975 AJ |
77 | |
78 | ||
79 | ||
ce5d54b0 L |
80 | #ifdef __x86_64__ |
81 | # define DR_CONTROL_RESERVED (0xFFFFFFFF0000FC00ULL) /* Reserved */ | |
2ece7975 AJ |
82 | #else |
83 | # define DR_CONTROL_RESERVED (0x00FC00U) /* Reserved */ | |
84 | #endif | |
d987f926 AJ |
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 */ |