1 /*
2 * intel_pt_log.c: Intel Processor Trace support
3 * Copyright (c) 2013-2014, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 */
15
16 #include <stdio.h>
17 #include <stdint.h>
18 #include <inttypes.h>
19 #include <stdarg.h>
20 #include <stdbool.h>
21 #include <string.h>
22
23 #include "intel-pt-log.h"
24 #include "intel-pt-insn-decoder.h"
25
26 #include "intel-pt-pkt-decoder.h"
27
28 #define MAX_LOG_NAME 256
29
30 static FILE *f;
31 static char log_name[MAX_LOG_NAME];
32 bool intel_pt_enable_logging;
33
intel_pt_log_enable(void)34 void intel_pt_log_enable(void)
35 {
36 intel_pt_enable_logging = true;
37 }
38
intel_pt_log_disable(void)39 void intel_pt_log_disable(void)
40 {
41 if (f)
42 fflush(f);
43 intel_pt_enable_logging = false;
44 }
45
intel_pt_log_set_name(const char * name)46 void intel_pt_log_set_name(const char *name)
47 {
48 strncpy(log_name, name, MAX_LOG_NAME - 5);
49 strcat(log_name, ".log");
50 }
51
intel_pt_print_data(const unsigned char * buf,int len,uint64_t pos,int indent)52 static void intel_pt_print_data(const unsigned char *buf, int len, uint64_t pos,
53 int indent)
54 {
55 int i;
56
57 for (i = 0; i < indent; i++)
58 fprintf(f, " ");
59
60 fprintf(f, " %08" PRIx64 ": ", pos);
61 for (i = 0; i < len; i++)
62 fprintf(f, " %02x", buf[i]);
63 for (; i < 16; i++)
64 fprintf(f, " ");
65 fprintf(f, " ");
66 }
67
intel_pt_print_no_data(uint64_t pos,int indent)68 static void intel_pt_print_no_data(uint64_t pos, int indent)
69 {
70 int i;
71
72 for (i = 0; i < indent; i++)
73 fprintf(f, " ");
74
75 fprintf(f, " %08" PRIx64 ": ", pos);
76 for (i = 0; i < 16; i++)
77 fprintf(f, " ");
78 fprintf(f, " ");
79 }
80
intel_pt_log_open(void)81 static int intel_pt_log_open(void)
82 {
83 if (!intel_pt_enable_logging)
84 return -1;
85
86 if (f)
87 return 0;
88
89 if (!log_name[0])
90 return -1;
91
92 f = fopen(log_name, "w+");
93 if (!f) {
94 intel_pt_enable_logging = false;
95 return -1;
96 }
97
98 return 0;
99 }
100
__intel_pt_log_packet(const struct intel_pt_pkt * packet,int pkt_len,uint64_t pos,const unsigned char * buf)101 void __intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
102 uint64_t pos, const unsigned char *buf)
103 {
104 char desc[INTEL_PT_PKT_DESC_MAX];
105
106 if (intel_pt_log_open())
107 return;
108
109 intel_pt_print_data(buf, pkt_len, pos, 0);
110 intel_pt_pkt_desc(packet, desc, INTEL_PT_PKT_DESC_MAX);
111 fprintf(f, "%s\n", desc);
112 }
113
__intel_pt_log_insn(struct intel_pt_insn * intel_pt_insn,uint64_t ip)114 void __intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
115 {
116 char desc[INTEL_PT_INSN_DESC_MAX];
117 size_t len = intel_pt_insn->length;
118
119 if (intel_pt_log_open())
120 return;
121
122 if (len > INTEL_PT_INSN_DBG_BUF_SZ)
123 len = INTEL_PT_INSN_DBG_BUF_SZ;
124 intel_pt_print_data(intel_pt_insn->buf, len, ip, 8);
125 if (intel_pt_insn_desc(intel_pt_insn, desc, INTEL_PT_INSN_DESC_MAX) > 0)
126 fprintf(f, "%s\n", desc);
127 else
128 fprintf(f, "Bad instruction!\n");
129 }
130
__intel_pt_log_insn_no_data(struct intel_pt_insn * intel_pt_insn,uint64_t ip)131 void __intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn,
132 uint64_t ip)
133 {
134 char desc[INTEL_PT_INSN_DESC_MAX];
135
136 if (intel_pt_log_open())
137 return;
138
139 intel_pt_print_no_data(ip, 8);
140 if (intel_pt_insn_desc(intel_pt_insn, desc, INTEL_PT_INSN_DESC_MAX) > 0)
141 fprintf(f, "%s\n", desc);
142 else
143 fprintf(f, "Bad instruction!\n");
144 }
145
__intel_pt_log(const char * fmt,...)146 void __intel_pt_log(const char *fmt, ...)
147 {
148 va_list args;
149
150 if (intel_pt_log_open())
151 return;
152
153 va_start(args, fmt);
154 vfprintf(f, fmt, args);
155 va_end(args);
156 }
157