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

   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
  25 void *intel_pt_log_fp(void)
  26 {
  27         return f;
  28 }
  29
  30 void intel_pt_log_enable(void)
  31 {
  32         intel_pt_enable_logging = true;
  33 }
  34
  35 void intel_pt_log_disable(void)
  36 {
  37         if (f)
  38                 fflush(f);
  39         intel_pt_enable_logging = false;
  40 }
  41
  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
  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
  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
  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
  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
 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
 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
 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 }