1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * intel_pt_log.c: Intel Processor Trace support
4 * Copyright (c) 2013-2014, Intel Corporation.
5 */
6
7 #include <stdio.h>
8 #include <stdint.h>
9 #include <inttypes.h>
10 #include <stdarg.h>
11 #include <stdbool.h>
12 #include <string.h>
13
14 #include "intel-pt-log.h"
15 #include "intel-pt-insn-decoder.h"
16
17 #include "intel-pt-pkt-decoder.h"
18
19 #define MAX_LOG_NAME 256
20
21 static FILE *f;
22 static char log_name[MAX_LOG_NAME];
23 bool intel_pt_enable_logging;
24
intel_pt_log_fp(void)25 void *intel_pt_log_fp(void)
26 {
27 return f;
28 }
29
intel_pt_log_enable(void)30 void intel_pt_log_enable(void)
31 {
32 intel_pt_enable_logging = true;
33 }
34
intel_pt_log_disable(void)35 void intel_pt_log_disable(void)
36 {
37 if (f)
38 fflush(f);
39 intel_pt_enable_logging = false;
40 }
41
intel_pt_log_set_name(const char * name)42 void intel_pt_log_set_name(const char *name)
43 {
44 strncpy(log_name, name, MAX_LOG_NAME - 5);
45 strcat(log_name, ".log");
46 }
47
intel_pt_print_data(const unsigned char * buf,int len,uint64_t pos,int indent)48 static void intel_pt_print_data(const unsigned char *buf, int len, uint64_t pos,
49 int indent)
50 {
51 int i;
52
53 for (i = 0; i < indent; i++)
54 fprintf(f, " ");
55
56 fprintf(f, " %08" PRIx64 ": ", pos);
57 for (i = 0; i < len; i++)
58 fprintf(f, " %02x", buf[i]);
59 for (; i < 16; i++)
60 fprintf(f, " ");
61 fprintf(f, " ");
62 }
63
intel_pt_print_no_data(uint64_t pos,int indent)64 static void intel_pt_print_no_data(uint64_t pos, int indent)
65 {
66 int i;
67
68 for (i = 0; i < indent; i++)
69 fprintf(f, " ");
70
71 fprintf(f, " %08" PRIx64 ": ", pos);
72 for (i = 0; i < 16; i++)
73 fprintf(f, " ");
74 fprintf(f, " ");
75 }
76
intel_pt_log_open(void)77 static int intel_pt_log_open(void)
78 {
79 if (!intel_pt_enable_logging)
80 return -1;
81
82 if (f)
83 return 0;
84
85 if (!log_name[0])
86 return -1;
87
88 f = fopen(log_name, "w+");
89 if (!f) {
90 intel_pt_enable_logging = false;
91 return -1;
92 }
93
94 return 0;
95 }
96
__intel_pt_log_packet(const struct intel_pt_pkt * packet,int pkt_len,uint64_t pos,const unsigned char * buf)97 void __intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
98 uint64_t pos, const unsigned char *buf)
99 {
100 char desc[INTEL_PT_PKT_DESC_MAX];
101
102 if (intel_pt_log_open())
103 return;
104
105 intel_pt_print_data(buf, pkt_len, pos, 0);
106 intel_pt_pkt_desc(packet, desc, INTEL_PT_PKT_DESC_MAX);
107 fprintf(f, "%s\n", desc);
108 }
109
__intel_pt_log_insn(struct intel_pt_insn * intel_pt_insn,uint64_t ip)110 void __intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
111 {
112 char desc[INTEL_PT_INSN_DESC_MAX];
113 size_t len = intel_pt_insn->length;
114
115 if (intel_pt_log_open())
116 return;
117
118 if (len > INTEL_PT_INSN_BUF_SZ)
119 len = INTEL_PT_INSN_BUF_SZ;
120 intel_pt_print_data(intel_pt_insn->buf, len, ip, 8);
121 if (intel_pt_insn_desc(intel_pt_insn, desc, INTEL_PT_INSN_DESC_MAX) > 0)
122 fprintf(f, "%s\n", desc);
123 else
124 fprintf(f, "Bad instruction!\n");
125 }
126
__intel_pt_log_insn_no_data(struct intel_pt_insn * intel_pt_insn,uint64_t ip)127 void __intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn,
128 uint64_t ip)
129 {
130 char desc[INTEL_PT_INSN_DESC_MAX];
131
132 if (intel_pt_log_open())
133 return;
134
135 intel_pt_print_no_data(ip, 8);
136 if (intel_pt_insn_desc(intel_pt_insn, desc, INTEL_PT_INSN_DESC_MAX) > 0)
137 fprintf(f, "%s\n", desc);
138 else
139 fprintf(f, "Bad instruction!\n");
140 }
141
__intel_pt_log(const char * fmt,...)142 void __intel_pt_log(const char *fmt, ...)
143 {
144 va_list args;
145
146 if (intel_pt_log_open())
147 return;
148
149 va_start(args, fmt);
150 vfprintf(f, fmt, args);
151 va_end(args);
152 }
153