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 27int verbose; 28int debug_peo_args; 29bool dump_trace = false, quiet = false; 30int debug_ordered_events; 31static int redirect_to_stderr; 32int debug_data_convert; 33 34int 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 48int 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 60static 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 75int 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 */ 93void 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 103int 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 117static 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) && isascii(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 166void 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 177static 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 186int 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 200int 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 /* For debug variables that are used as bool types, set to 0. */ 211 redirect_to_stderr = 0; 212 debug_peo_args = 0; 213 214 return 0; 215} 216 217#define DEBUG_WRAPPER(__n, __l) \ 218static int pr_ ## __n ## _wrapper(const char *fmt, ...) \ 219{ \ 220 va_list args; \ 221 int ret; \ 222 \ 223 va_start(args, fmt); \ 224 ret = veprintf(__l, verbose, fmt, args); \ 225 va_end(args); \ 226 return ret; \ 227} 228 229DEBUG_WRAPPER(warning, 0); 230DEBUG_WRAPPER(debug, 1); 231 232void perf_debug_setup(void) 233{ 234 libapi_set_print(pr_warning_wrapper, pr_warning_wrapper, pr_debug_wrapper); 235} 236 237/* Obtain a backtrace and print it to stdout. */ 238#ifdef HAVE_BACKTRACE_SUPPORT 239void dump_stack(void) 240{ 241 void *array[16]; 242 size_t size = backtrace(array, ARRAY_SIZE(array)); 243 char **strings = backtrace_symbols(array, size); 244 size_t i; 245 246 printf("Obtained %zd stack frames.\n", size); 247 248 for (i = 0; i < size; i++) 249 printf("%s\n", strings[i]); 250 251 free(strings); 252} 253#else 254void dump_stack(void) {} 255#endif 256 257void sighandler_dump_stack(int sig) 258{ 259 psignal(sig, "perf"); 260 dump_stack(); 261 signal(sig, SIG_DFL); 262 raise(sig); 263} 264