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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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 "addr_location.h"#include "color.h"#include "debug.h"#include "env.h"#include "event.h"#include "machine.h"#include "map.h"#include "print_binary.h"#include "srcline.h"#include "symbol.h"#include "synthetic-events.h"#include "target.h"#include "thread.h"#include "trace-event.h"#include "ui/helpline.h"#include "ui/ui.h"#include "util/parse-sublevel-options.h"
#include <linux/ctype.h>
#ifdef HAVE_LIBTRACEEVENT#include <event-parse.h>#else#define LIBTRACEEVENT_VERSION 0#endif
int verbose;int debug_kmaps;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;static bool debug_display_time;int debug_type_profile;
FILE *debug_file(void){ if (!_debug_file) { debug_set_file(stderr); pr_warning_once("debug_file not set"); } return _debug_file;}
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(debug_file(), "[%13" PRIu64 ".%06" PRIu64 "] ", secs, usecs); ret += vfprintf(debug_file(), 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 = "kmaps", .value_ptr = &debug_kmaps }, { .name = "type-profile", .value_ptr = &debug_type_profile }, { .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;
#if LIBTRACEEVENT_VERSION >= MAKE_LIBTRACEEVENT_VERSION(1, 3, 0) if (verbose == 1) tep_set_loglevel(TEP_LOG_INFO); else if (verbose == 2) tep_set_loglevel(TEP_LOG_DEBUG); else if (verbose >= 3) tep_set_loglevel(TEP_LOG_ALL);#endif 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++; }
/* For debug variables that are used as bool types, set to 0. */ redirect_to_stderr = 0; debug_peo_args = 0; debug_kmaps = 0; debug_type_profile = 0;
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);}
void __dump_stack(FILE *file, void **stackdump, size_t stackdump_size){ /* TODO: async safety. printf, malloc, etc. aren't safe inside a signal handler. */ pid_t pid = getpid(); struct machine *machine; struct thread *thread = NULL; struct perf_env host_env;
perf_env__init(&host_env); machine = machine__new_live(&host_env, /*kernel_maps=*/false, pid);
if (machine) thread = machine__find_thread(machine, pid, pid);
#ifdef HAVE_BACKTRACE_SUPPORT if (!machine || !thread) { /* * Backtrace functions are async signal safe. Fall back on them * if machine/thread creation fails. */ backtrace_symbols_fd(stackdump, stackdump_size, fileno(file)); machine__delete(machine); perf_env__exit(&host_env); return; }#endif
for (size_t i = 0; i < stackdump_size; i++) { struct addr_location al; u64 addr = (u64)(uintptr_t)stackdump[i]; bool printed = false;
addr_location__init(&al); if (thread && thread__find_map(thread, PERF_RECORD_MISC_USER, addr, &al)) { al.sym = map__find_symbol(al.map, al.addr); if (al.sym) { fprintf(file, " #%zd %p in %s ", i, stackdump[i], al.sym->name); printed = true; } } if (!printed) fprintf(file, " #%zd %p ", i, stackdump[i]);
map__fprintf_srcline(al.map, al.addr, "", file); fprintf(file, "\n"); addr_location__exit(&al); } thread__put(thread); machine__delete(machine); perf_env__exit(&host_env);}
/* Obtain a backtrace and print it to stdout. */#ifdef HAVE_BACKTRACE_SUPPORTvoid dump_stack(void){ void *stackdump[32]; size_t size = backtrace(stackdump, ARRAY_SIZE(stackdump));
__dump_stack(stdout, stackdump, size);}#elsevoid dump_stack(void) {}#endif
void sighandler_dump_stack(int sig){ psignal(sig, "perf"); dump_stack(); signal(sig, SIG_DFL); raise(sig);}