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02d27625 MM |
1 | /* Branch trace support for GDB, the GNU debugger. |
2 | ||
32d0add0 | 3 | Copyright (C) 2013-2015 Free Software Foundation, Inc. |
02d27625 MM |
4 | |
5 | Contributed by Intel Corp. <markus.t.metzger@intel.com>. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
21 | ||
22 | #ifndef BTRACE_COMMON_H | |
23 | #define BTRACE_COMMON_H | |
24 | ||
25 | /* Branch tracing (btrace) is a per-thread control-flow execution trace of the | |
26 | inferior. For presentation purposes, the branch trace is represented as a | |
27 | list of sequential control-flow blocks, one such list per thread. */ | |
28 | ||
02d27625 MM |
29 | #include "vec.h" |
30 | ||
31 | /* A branch trace block. | |
32 | ||
33 | This represents a block of sequential control-flow. Adjacent blocks will be | |
34 | connected via calls, returns, or jumps. The latter can be direct or | |
35 | indirect, conditional or unconditional. Branches can further be | |
36 | asynchronous, e.g. interrupts. */ | |
37 | struct btrace_block | |
38 | { | |
969c39fb MM |
39 | /* The address of the first byte of the first instruction in the block. |
40 | The address may be zero if we do not know the beginning of this block, | |
41 | such as for the first block in a delta trace. */ | |
02d27625 MM |
42 | CORE_ADDR begin; |
43 | ||
44 | /* The address of the first byte of the last instruction in the block. */ | |
45 | CORE_ADDR end; | |
46 | }; | |
47 | ||
02d27625 | 48 | /* Define functions operating on a vector of branch trace blocks. */ |
734b0e4b | 49 | typedef struct btrace_block btrace_block_s; |
02d27625 MM |
50 | DEF_VEC_O (btrace_block_s); |
51 | ||
734b0e4b MM |
52 | /* Enumeration of btrace formats. */ |
53 | ||
54 | enum btrace_format | |
55 | { | |
56 | /* No branch trace format. */ | |
57 | BTRACE_FORMAT_NONE, | |
58 | ||
59 | /* Branch trace is in Branch Trace Store (BTS) format. | |
60 | Actually, the format is a sequence of blocks derived from BTS. */ | |
b20a6524 MM |
61 | BTRACE_FORMAT_BTS, |
62 | ||
63 | /* Branch trace is in Intel(R) Processor Trace format. */ | |
64 | BTRACE_FORMAT_PT | |
734b0e4b MM |
65 | }; |
66 | ||
afb778a2 MM |
67 | /* An enumeration of cpu vendors. */ |
68 | ||
69 | enum btrace_cpu_vendor | |
70 | { | |
71 | /* We do not know this vendor. */ | |
72 | CV_UNKNOWN, | |
73 | ||
74 | /* Intel. */ | |
75 | CV_INTEL | |
76 | }; | |
77 | ||
78 | /* A cpu identifier. */ | |
79 | ||
80 | struct btrace_cpu | |
81 | { | |
82 | /* The processor vendor. */ | |
83 | enum btrace_cpu_vendor vendor; | |
84 | ||
85 | /* The cpu family. */ | |
86 | unsigned short family; | |
87 | ||
88 | /* The cpu model. */ | |
89 | unsigned char model; | |
90 | ||
91 | /* The cpu stepping. */ | |
92 | unsigned char stepping; | |
93 | }; | |
94 | ||
d33501a5 MM |
95 | /* A BTS configuration. */ |
96 | ||
97 | struct btrace_config_bts | |
98 | { | |
e7b01ce0 MM |
99 | /* The size of the branch trace buffer in bytes. |
100 | ||
101 | This is unsigned int and not size_t since it is registered as | |
102 | control variable for "set record btrace bts buffer-size". */ | |
d33501a5 MM |
103 | unsigned int size; |
104 | }; | |
105 | ||
b20a6524 MM |
106 | /* An Intel(R) Processor Trace configuration. */ |
107 | ||
108 | struct btrace_config_pt | |
109 | { | |
e7b01ce0 MM |
110 | /* The size of the branch trace buffer in bytes. |
111 | ||
112 | This is unsigned int and not size_t since it is registered as | |
113 | control variable for "set record btrace pt buffer-size". */ | |
b20a6524 MM |
114 | unsigned int size; |
115 | }; | |
116 | ||
f4abbc16 MM |
117 | /* A branch tracing configuration. |
118 | ||
119 | This describes the requested configuration as well as the actually | |
d33501a5 MM |
120 | obtained configuration. |
121 | We describe the configuration for all different formats so we can | |
122 | easily switch between formats. */ | |
f4abbc16 MM |
123 | |
124 | struct btrace_config | |
125 | { | |
126 | /* The branch tracing format. */ | |
127 | enum btrace_format format; | |
d33501a5 MM |
128 | |
129 | /* The BTS format configuration. */ | |
130 | struct btrace_config_bts bts; | |
b20a6524 MM |
131 | |
132 | /* The Intel(R) Processor Trace format configuration. */ | |
133 | struct btrace_config_pt pt; | |
f4abbc16 MM |
134 | }; |
135 | ||
734b0e4b MM |
136 | /* Branch trace in BTS format. */ |
137 | struct btrace_data_bts | |
138 | { | |
139 | /* Branch trace is represented as a vector of branch trace blocks starting | |
140 | with the most recent block. */ | |
141 | VEC (btrace_block_s) *blocks; | |
142 | }; | |
143 | ||
b20a6524 MM |
144 | /* Configuration information to go with the trace data. */ |
145 | struct btrace_data_pt_config | |
146 | { | |
147 | /* The processor on which the trace has been collected. */ | |
148 | struct btrace_cpu cpu; | |
149 | }; | |
150 | ||
151 | /* Branch trace in Intel(R) Processor Trace format. */ | |
152 | struct btrace_data_pt | |
153 | { | |
154 | /* Some configuration information to go with the data. */ | |
155 | struct btrace_data_pt_config config; | |
156 | ||
157 | /* The trace data. */ | |
158 | gdb_byte *data; | |
159 | ||
160 | /* The size of DATA in bytes. */ | |
e7b01ce0 | 161 | size_t size; |
b20a6524 MM |
162 | }; |
163 | ||
734b0e4b MM |
164 | /* The branch trace data. */ |
165 | struct btrace_data | |
166 | { | |
167 | enum btrace_format format; | |
168 | ||
169 | union | |
170 | { | |
171 | /* Format == BTRACE_FORMAT_BTS. */ | |
172 | struct btrace_data_bts bts; | |
b20a6524 MM |
173 | |
174 | /* Format == BTRACE_FORMAT_PT. */ | |
175 | struct btrace_data_pt pt; | |
734b0e4b MM |
176 | } variant; |
177 | }; | |
178 | ||
02d27625 MM |
179 | /* Target specific branch trace information. */ |
180 | struct btrace_target_info; | |
181 | ||
182 | /* Enumeration of btrace read types. */ | |
183 | ||
184 | enum btrace_read_type | |
185 | { | |
186 | /* Send all available trace. */ | |
864089d2 | 187 | BTRACE_READ_ALL, |
02d27625 MM |
188 | |
189 | /* Send all available trace, if it changed. */ | |
969c39fb MM |
190 | BTRACE_READ_NEW, |
191 | ||
192 | /* Send the trace since the last request. This will fail if the trace | |
193 | buffer overflowed. */ | |
194 | BTRACE_READ_DELTA | |
195 | }; | |
196 | ||
197 | /* Enumeration of btrace errors. */ | |
198 | ||
199 | enum btrace_error | |
200 | { | |
201 | /* No error. Everything is OK. */ | |
202 | BTRACE_ERR_NONE, | |
203 | ||
204 | /* An unknown error. */ | |
205 | BTRACE_ERR_UNKNOWN, | |
206 | ||
207 | /* Branch tracing is not supported on this system. */ | |
208 | BTRACE_ERR_NOT_SUPPORTED, | |
209 | ||
210 | /* The branch trace buffer overflowed; no delta read possible. */ | |
211 | BTRACE_ERR_OVERFLOW | |
02d27625 MM |
212 | }; |
213 | ||
734b0e4b MM |
214 | /* Return a string representation of FORMAT. */ |
215 | extern const char *btrace_format_string (enum btrace_format format); | |
216 | ||
217 | /* Initialize DATA. */ | |
218 | extern void btrace_data_init (struct btrace_data *data); | |
219 | ||
220 | /* Cleanup DATA. */ | |
221 | extern void btrace_data_fini (struct btrace_data *data); | |
222 | ||
9be54cae MM |
223 | /* Clear DATA. */ |
224 | extern void btrace_data_clear (struct btrace_data *data); | |
225 | ||
734b0e4b MM |
226 | /* Return non-zero if DATA is empty; zero otherwise. */ |
227 | extern int btrace_data_empty (struct btrace_data *data); | |
228 | ||
9be54cae MM |
229 | /* Append the branch trace data from SRC to the end of DST. |
230 | Both SRC and DST must use the same format. | |
231 | Returns zero on success; a negative number otherwise. */ | |
232 | extern int btrace_data_append (struct btrace_data *dst, | |
233 | const struct btrace_data *src); | |
234 | ||
02d27625 | 235 | #endif /* BTRACE_COMMON_H */ |