tools/perf/util/intel-pt-decoder/intel-pt-log.c

   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
  34 void intel_pt_log_enable(void)
  35 {
  36         intel_pt_enable_logging = true;
  37 }
  38
  39 void intel_pt_log_disable(void)
  40 {
  41         if (f)
  42                 fflush(f);
  43         intel_pt_enable_logging = false;
  44 }
  45
  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
  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
  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
  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
 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
 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_BUF_SZ)
 123                 len = INTEL_PT_INSN_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
 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
 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 }