// SPDX-License-Identifier: GPL-2.0 /* For general debugging purposes */ #include <inttypes.h> #include <string.h> #include <stdarg.h> #include <stdio.h> #include <stdlib.h> #include <sys/wait.h> #include <api/debug.h> #include <linux/kernel.h> #include <linux/time64.h> #include <sys/time.h> #ifdef HAVE_BACKTRACE_SUPPORT #include <execinfo.h> #endif #include "color.h" #include "event.h" #include "debug.h" #include "print_binary.h" #include "target.h" #include "ui/helpline.h" #include "ui/ui.h" #include "util/parse-sublevel-options.h" #include <linux/ctype.h> int verbose; int debug_peo_args; bool dump_trace = false, quiet = false; int debug_ordered_events; static int redirect_to_stderr; int debug_data_convert; static FILE *debug_file; bool debug_display_time; void debug_set_file(FILE *file) { debug_file = file; } void debug_set_display_time(bool set) { debug_display_time = set; } static int fprintf_time(FILE *file) { struct timeval tod; struct tm ltime; char date[64]; if (!debug_display_time) return 0; if (gettimeofday(&tod, NULL) != 0) return 0; if (localtime_r(&tod.tv_sec, <ime) == NULL) return 0; strftime(date, sizeof(date), "%F %H:%M:%S", <ime); return fprintf(file, "[%s.%06lu] ", date, (long)tod.tv_usec); } int veprintf(int level, int var, const char *fmt, va_list args) { int ret = 0; if (var >= level) { if (use_browser >= 1 && !redirect_to_stderr) { ui_helpline__vshow(fmt, args); } else { ret = fprintf_time(debug_file); ret += vfprintf(debug_file, fmt, args); } } return ret; } int eprintf(int level, int var, const char *fmt, ...) { va_list args; int ret; va_start(args, fmt); ret = veprintf(level, var, fmt, args); va_end(args); return ret; } static int veprintf_time(u64 t, const char *fmt, va_list args) { int ret = 0; u64 secs, usecs, nsecs = t; secs = nsecs / NSEC_PER_SEC; nsecs -= secs * NSEC_PER_SEC; usecs = nsecs / NSEC_PER_USEC; ret = fprintf(stderr, "[%13" PRIu64 ".%06" PRIu64 "] ", secs, usecs); ret += vfprintf(stderr, fmt, args); return ret; } int eprintf_time(int level, int var, u64 t, const char *fmt, ...) { int ret = 0; va_list args; if (var >= level) { va_start(args, fmt); ret = veprintf_time(t, fmt, args); va_end(args); } return ret; } /* * Overloading libtraceevent standard info print * function, display with -v in perf. */ void pr_stat(const char *fmt, ...) { va_list args; va_start(args, fmt); veprintf(1, verbose, fmt, args); va_end(args); eprintf(1, verbose, "\n"); } int dump_printf(const char *fmt, ...) { va_list args; int ret = 0; if (dump_trace) { va_start(args, fmt); ret = vprintf(fmt, args); va_end(args); } return ret; } static int trace_event_printer(enum binary_printer_ops op, unsigned int val, void *extra, FILE *fp) { const char *color = PERF_COLOR_BLUE; union perf_event *event = (union perf_event *)extra; unsigned char ch = (unsigned char)val; int printed = 0; switch (op) { case BINARY_PRINT_DATA_BEGIN: printed += fprintf(fp, "."); printed += color_fprintf(fp, color, "\n. ... raw event: size %d bytes\n", event->header.size); break; case BINARY_PRINT_LINE_BEGIN: printed += fprintf(fp, "."); break; case BINARY_PRINT_ADDR: printed += color_fprintf(fp, color, " %04x: ", val); break; case BINARY_PRINT_NUM_DATA: printed += color_fprintf(fp, color, " %02x", val); break; case BINARY_PRINT_NUM_PAD: printed += color_fprintf(fp, color, " "); break; case BINARY_PRINT_SEP: printed += color_fprintf(fp, color, " "); break; case BINARY_PRINT_CHAR_DATA: printed += color_fprintf(fp, color, "%c", isprint(ch) && isascii(ch) ? ch : '.'); break; case BINARY_PRINT_CHAR_PAD: printed += color_fprintf(fp, color, " "); break; case BINARY_PRINT_LINE_END: printed += color_fprintf(fp, color, "\n"); break; case BINARY_PRINT_DATA_END: printed += fprintf(fp, "\n"); break; default: break; } return printed; } void trace_event(union perf_event *event) { unsigned char *raw_event = (void *)event; if (!dump_trace) return; print_binary(raw_event, event->header.size, 16, trace_event_printer, event); } static struct sublevel_option debug_opts[] = { { .name = "verbose", .value_ptr = &verbose }, { .name = "ordered-events", .value_ptr = &debug_ordered_events}, { .name = "stderr", .value_ptr = &redirect_to_stderr}, { .name = "data-convert", .value_ptr = &debug_data_convert }, { .name = "perf-event-open", .value_ptr = &debug_peo_args }, { .name = NULL, } }; int perf_debug_option(const char *str) { int ret; ret = perf_parse_sublevel_options(str, debug_opts); if (ret) return ret; /* Allow only verbose value in range (0, 10), otherwise set 0. */ verbose = (verbose < 0) || (verbose > 10) ? 0 : verbose; return 0; } int perf_quiet_option(void) { struct sublevel_option *opt = &debug_opts[0]; /* disable all debug messages */ while (opt->name) { *opt->value_ptr = -1; opt++; } return 0; } #define DEBUG_WRAPPER(__n, __l) \ static int pr_ ## __n ## _wrapper(const char *fmt, ...) \ { \ va_list args; \ int ret; \ \ va_start(args, fmt); \ ret = veprintf(__l, verbose, fmt, args); \ va_end(args); \ return ret; \ } DEBUG_WRAPPER(warning, 0); DEBUG_WRAPPER(debug, 1); void perf_debug_setup(void) { debug_set_file(stderr); libapi_set_print(pr_warning_wrapper, pr_warning_wrapper, pr_debug_wrapper); } /* Obtain a backtrace and print it to stdout. */ #ifdef HAVE_BACKTRACE_SUPPORT void dump_stack(void) { void *array[16]; size_t size = backtrace(array, ARRAY_SIZE(array)); char **strings = backtrace_symbols(array, size); size_t i; printf("Obtained %zd stack frames.\n", size); for (i = 0; i < size; i++) printf("%s\n", strings[i]); free(strings); } #else void dump_stack(void) {} #endif void sighandler_dump_stack(int sig) { psignal(sig, "perf"); dump_stack(); signal(sig, SIG_DFL); raise(sig); }