tools/perf/util/debug.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* For general debugging purposes */
   3
   4 #include <inttypes.h>
   5 #include <string.h>
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <sys/wait.h>
  10 #include <api/debug.h>
  11 #include <linux/kernel.h>
  12 #include <linux/time64.h>
  13 #ifdef HAVE_BACKTRACE_SUPPORT
  14 #include <execinfo.h>
  15 #endif
  16 #include "color.h"
  17 #include "event.h"
  18 #include "debug.h"
  19 #include "print_binary.h"
  20 #include "target.h"
  21 #include "ui/helpline.h"
  22 #include "ui/ui.h"
  23 #include "util/parse-sublevel-options.h"
  24
  25 #include <linux/ctype.h>
  26
  27 int verbose;
  28 int debug_peo_args;
  29 bool dump_trace = false, quiet = false;
  30 int debug_ordered_events;
  31 static int redirect_to_stderr;
  32 int debug_data_convert;
  33
  34 int veprintf(int level, int var, const char *fmt, va_list args)
  35 {
  36         int ret = 0;
  37
  38         if (var >= level) {
  39                 if (use_browser >= 1 && !redirect_to_stderr)
  40                         ui_helpline__vshow(fmt, args);
  41                 else
  42                         ret = vfprintf(stderr, fmt, args);
  43         }
  44
  45         return ret;
  46 }
  47
  48 int eprintf(int level, int var, const char *fmt, ...)
  49 {
  50         va_list args;
  51         int ret;
  52
  53         va_start(args, fmt);
  54         ret = veprintf(level, var, fmt, args);
  55         va_end(args);
  56
  57         return ret;
  58 }
  59
  60 static int veprintf_time(u64 t, const char *fmt, va_list args)
  61 {
  62         int ret = 0;
  63         u64 secs, usecs, nsecs = t;
  64
  65         secs   = nsecs / NSEC_PER_SEC;
  66         nsecs -= secs  * NSEC_PER_SEC;
  67         usecs  = nsecs / NSEC_PER_USEC;
  68
  69         ret = fprintf(stderr, "[%13" PRIu64 ".%06" PRIu64 "] ",
  70                       secs, usecs);
  71         ret += vfprintf(stderr, fmt, args);
  72         return ret;
  73 }
  74
  75 int eprintf_time(int level, int var, u64 t, const char *fmt, ...)
  76 {
  77         int ret = 0;
  78         va_list args;
  79
  80         if (var >= level) {
  81                 va_start(args, fmt);
  82                 ret = veprintf_time(t, fmt, args);
  83                 va_end(args);
  84         }
  85
  86         return ret;
  87 }
  88
  89 /*
  90  * Overloading libtraceevent standard info print
  91  * function, display with -v in perf.
  92  */
  93 void pr_stat(const char *fmt, ...)
  94 {
  95         va_list args;
  96
  97         va_start(args, fmt);
  98         veprintf(1, verbose, fmt, args);
  99         va_end(args);
 100         eprintf(1, verbose, "\n");
 101 }
 102
 103 int dump_printf(const char *fmt, ...)
 104 {
 105         va_list args;
 106         int ret = 0;
 107
 108         if (dump_trace) {
 109                 va_start(args, fmt);
 110                 ret = vprintf(fmt, args);
 111                 va_end(args);
 112         }
 113
 114         return ret;
 115 }
 116
 117 static int trace_event_printer(enum binary_printer_ops op,
 118                                unsigned int val, void *extra, FILE *fp)
 119 {
 120         const char *color = PERF_COLOR_BLUE;
 121         union perf_event *event = (union perf_event *)extra;
 122         unsigned char ch = (unsigned char)val;
 123         int printed = 0;
 124
 125         switch (op) {
 126         case BINARY_PRINT_DATA_BEGIN:
 127                 printed += fprintf(fp, ".");
 128                 printed += color_fprintf(fp, color, "\n. ... raw event: size %d bytes\n",
 129                                          event->header.size);
 130                 break;
 131         case BINARY_PRINT_LINE_BEGIN:
 132                 printed += fprintf(fp, ".");
 133                 break;
 134         case BINARY_PRINT_ADDR:
 135                 printed += color_fprintf(fp, color, "  %04x: ", val);
 136                 break;
 137         case BINARY_PRINT_NUM_DATA:
 138                 printed += color_fprintf(fp, color, " %02x", val);
 139                 break;
 140         case BINARY_PRINT_NUM_PAD:
 141                 printed += color_fprintf(fp, color, "   ");
 142                 break;
 143         case BINARY_PRINT_SEP:
 144                 printed += color_fprintf(fp, color, "  ");
 145                 break;
 146         case BINARY_PRINT_CHAR_DATA:
 147                 printed += color_fprintf(fp, color, "%c",
 148                               isprint(ch) ? ch : '.');
 149                 break;
 150         case BINARY_PRINT_CHAR_PAD:
 151                 printed += color_fprintf(fp, color, " ");
 152                 break;
 153         case BINARY_PRINT_LINE_END:
 154                 printed += color_fprintf(fp, color, "\n");
 155                 break;
 156         case BINARY_PRINT_DATA_END:
 157                 printed += fprintf(fp, "\n");
 158                 break;
 159         default:
 160                 break;
 161         }
 162
 163         return printed;
 164 }
 165
 166 void trace_event(union perf_event *event)
 167 {
 168         unsigned char *raw_event = (void *)event;
 169
 170         if (!dump_trace)
 171                 return;
 172
 173         print_binary(raw_event, event->header.size, 16,
 174                      trace_event_printer, event);
 175 }
 176
 177 static struct sublevel_option debug_opts[] = {
 178         { .name = "verbose",            .value_ptr = &verbose },
 179         { .name = "ordered-events",     .value_ptr = &debug_ordered_events},
 180         { .name = "stderr",             .value_ptr = &redirect_to_stderr},
 181         { .name = "data-convert",       .value_ptr = &debug_data_convert },
 182         { .name = "perf-event-open",    .value_ptr = &debug_peo_args },
 183         { .name = NULL, }
 184 };
 185
 186 int perf_debug_option(const char *str)
 187 {
 188         int ret;
 189
 190         ret = perf_parse_sublevel_options(str, debug_opts);
 191         if (ret)
 192                 return ret;
 193
 194         /* Allow only verbose value in range (0, 10), otherwise set 0. */
 195         verbose = (verbose < 0) || (verbose > 10) ? 0 : verbose;
 196
 197         return 0;
 198 }
 199
 200 int perf_quiet_option(void)
 201 {
 202         struct sublevel_option *opt = &debug_opts[0];
 203
 204         /* disable all debug messages */
 205         while (opt->name) {
 206                 *opt->value_ptr = -1;
 207                 opt++;
 208         }
 209
 210         return 0;
 211 }
 212
 213 #define DEBUG_WRAPPER(__n, __l)                         \
 214 static int pr_ ## __n ## _wrapper(const char *fmt, ...) \
 215 {                                                       \
 216         va_list args;                                   \
 217         int ret;                                        \
 218                                                         \
 219         va_start(args, fmt);                            \
 220         ret = veprintf(__l, verbose, fmt, args);        \
 221         va_end(args);                                   \
 222         return ret;                                     \
 223 }
 224
 225 DEBUG_WRAPPER(warning, 0);
 226 DEBUG_WRAPPER(debug, 1);
 227
 228 void perf_debug_setup(void)
 229 {
 230         libapi_set_print(pr_warning_wrapper, pr_warning_wrapper, pr_debug_wrapper);
 231 }
 232
 233 /* Obtain a backtrace and print it to stdout. */
 234 #ifdef HAVE_BACKTRACE_SUPPORT
 235 void dump_stack(void)
 236 {
 237         void *array[16];
 238         size_t size = backtrace(array, ARRAY_SIZE(array));
 239         char **strings = backtrace_symbols(array, size);
 240         size_t i;
 241
 242         printf("Obtained %zd stack frames.\n", size);
 243
 244         for (i = 0; i < size; i++)
 245                 printf("%s\n", strings[i]);
 246
 247         free(strings);
 248 }
 249 #else
 250 void dump_stack(void) {}
 251 #endif
 252
 253 void sighandler_dump_stack(int sig)
 254 {
 255         psignal(sig, "perf");
 256         dump_stack();
 257         signal(sig, SIG_DFL);
 258         raise(sig);
 259 }