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 } 260