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599 lines
13 KiB
599 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (c) 2013 Google, Inc |
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*/ |
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/* Decode and dump U-Boot profiling information */ |
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#include <assert.h> |
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#include <ctype.h> |
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#include <limits.h> |
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#include <regex.h> |
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#include <stdarg.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <sys/param.h> |
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#include <sys/types.h> |
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#include <compiler.h> |
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#include <trace.h> |
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#define MAX_LINE_LEN 500 |
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enum { |
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FUNCF_TRACE = 1 << 0, /* Include this function in trace */ |
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}; |
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struct func_info { |
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unsigned long offset; |
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const char *name; |
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unsigned long code_size; |
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unsigned long call_count; |
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unsigned flags; |
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/* the section this function is in */ |
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struct objsection_info *objsection; |
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}; |
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enum trace_line_type { |
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TRACE_LINE_INCLUDE, |
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TRACE_LINE_EXCLUDE, |
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}; |
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struct trace_configline_info { |
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struct trace_configline_info *next; |
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enum trace_line_type type; |
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const char *name; /* identifier name / wildcard */ |
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regex_t regex; /* Regex to use if name starts with / */ |
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}; |
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/* The contents of the trace config file */ |
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struct trace_configline_info *trace_config_head; |
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struct func_info *func_list; |
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int func_count; |
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struct trace_call *call_list; |
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int call_count; |
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int verbose; /* Verbosity level 0=none, 1=warn, 2=notice, 3=info, 4=debug */ |
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unsigned long text_offset; /* text address of first function */ |
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static void outf(int level, const char *fmt, ...) |
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__attribute__ ((format (__printf__, 2, 3))); |
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#define error(fmt, b...) outf(0, fmt, ##b) |
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#define warn(fmt, b...) outf(1, fmt, ##b) |
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#define notice(fmt, b...) outf(2, fmt, ##b) |
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#define info(fmt, b...) outf(3, fmt, ##b) |
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#define debug(fmt, b...) outf(4, fmt, ##b) |
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static void outf(int level, const char *fmt, ...) |
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{ |
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if (verbose >= level) { |
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va_list args; |
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va_start(args, fmt); |
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vfprintf(stderr, fmt, args); |
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va_end(args); |
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} |
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} |
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static void usage(void) |
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{ |
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fprintf(stderr, |
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"Usage: proftool -cds -v3 <cmd> <profdata>\n" |
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"\n" |
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"Commands\n" |
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" dump-ftrace\t\tDump out textual data in ftrace format\n" |
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"\n" |
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"Options:\n" |
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" -m <map>\tSpecify Systen.map file\n" |
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" -t <trace>\tSpecific trace data file (from U-Boot)\n" |
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" -v <0-4>\tSpecify verbosity\n"); |
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exit(EXIT_FAILURE); |
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} |
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static int h_cmp_offset(const void *v1, const void *v2) |
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{ |
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const struct func_info *f1 = v1, *f2 = v2; |
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return (f1->offset / FUNC_SITE_SIZE) - (f2->offset / FUNC_SITE_SIZE); |
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} |
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static int read_system_map(FILE *fin) |
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{ |
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unsigned long offset, start = 0; |
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struct func_info *func; |
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char buff[MAX_LINE_LEN]; |
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char symtype; |
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char symname[MAX_LINE_LEN + 1]; |
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int linenum; |
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int alloced; |
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for (linenum = 1, alloced = func_count = 0;; linenum++) { |
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int fields = 0; |
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if (fgets(buff, sizeof(buff), fin)) |
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fields = sscanf(buff, "%lx %c %100s\n", &offset, |
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&symtype, symname); |
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if (fields == 2) { |
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continue; |
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} else if (feof(fin)) { |
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break; |
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} else if (fields < 2) { |
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error("Map file line %d: invalid format\n", linenum); |
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return 1; |
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} |
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/* Must be a text symbol */ |
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symtype = tolower(symtype); |
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if (symtype != 't' && symtype != 'w') |
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continue; |
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if (func_count == alloced) { |
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alloced += 256; |
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func_list = realloc(func_list, |
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sizeof(struct func_info) * alloced); |
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assert(func_list); |
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} |
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if (!func_count) |
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start = offset; |
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func = &func_list[func_count++]; |
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memset(func, '\0', sizeof(*func)); |
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func->offset = offset - start; |
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func->name = strdup(symname); |
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func->flags = FUNCF_TRACE; /* trace by default */ |
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/* Update previous function's code size */ |
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if (func_count > 1) |
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func[-1].code_size = func->offset - func[-1].offset; |
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} |
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notice("%d functions found in map file\n", func_count); |
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text_offset = start; |
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return 0; |
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} |
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static int read_data(FILE *fin, void *buff, int size) |
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{ |
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int err; |
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err = fread(buff, 1, size, fin); |
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if (!err) |
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return 1; |
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if (err != size) { |
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error("Cannot read profile file at pos %ld\n", ftell(fin)); |
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return -1; |
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} |
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return 0; |
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} |
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static struct func_info *find_func_by_offset(uint32_t offset) |
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{ |
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struct func_info key, *found; |
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key.offset = offset; |
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found = bsearch(&key, func_list, func_count, sizeof(struct func_info), |
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h_cmp_offset); |
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return found; |
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} |
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/* This finds the function which contains the given offset */ |
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static struct func_info *find_caller_by_offset(uint32_t offset) |
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{ |
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int low; /* least function that could be a match */ |
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int high; /* greated function that could be a match */ |
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struct func_info key; |
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low = 0; |
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high = func_count - 1; |
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key.offset = offset; |
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while (high > low + 1) { |
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int mid = (low + high) / 2; |
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int result; |
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result = h_cmp_offset(&key, &func_list[mid]); |
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if (result > 0) |
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low = mid; |
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else if (result < 0) |
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high = mid; |
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else |
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return &func_list[mid]; |
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} |
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return low >= 0 ? &func_list[low] : NULL; |
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} |
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static int read_calls(FILE *fin, int count) |
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{ |
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struct trace_call *call_data; |
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int i; |
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notice("call count: %d\n", count); |
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call_list = (struct trace_call *)calloc(count, sizeof(*call_data)); |
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if (!call_list) { |
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error("Cannot allocate call_list\n"); |
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return -1; |
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} |
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call_count = count; |
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call_data = call_list; |
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for (i = 0; i < count; i++, call_data++) { |
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if (read_data(fin, call_data, sizeof(*call_data))) |
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return 1; |
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} |
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return 0; |
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} |
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static int read_profile(FILE *fin, int *not_found) |
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{ |
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struct trace_output_hdr hdr; |
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*not_found = 0; |
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while (!feof(fin)) { |
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int err; |
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err = read_data(fin, &hdr, sizeof(hdr)); |
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if (err == 1) |
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break; /* EOF */ |
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else if (err) |
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return 1; |
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switch (hdr.type) { |
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case TRACE_CHUNK_FUNCS: |
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/* Ignored at present */ |
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break; |
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case TRACE_CHUNK_CALLS: |
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if (read_calls(fin, hdr.rec_count)) |
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return 1; |
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break; |
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} |
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} |
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return 0; |
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} |
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static int read_map_file(const char *fname) |
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{ |
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FILE *fmap; |
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int err = 0; |
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fmap = fopen(fname, "r"); |
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if (!fmap) { |
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error("Cannot open map file '%s'\n", fname); |
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return 1; |
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} |
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if (fmap) { |
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err = read_system_map(fmap); |
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fclose(fmap); |
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} |
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return err; |
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} |
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static int read_profile_file(const char *fname) |
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{ |
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int not_found = INT_MAX; |
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FILE *fprof; |
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int err; |
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fprof = fopen(fname, "rb"); |
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if (!fprof) { |
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error("Cannot open profile data file '%s'\n", |
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fname); |
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return 1; |
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} else { |
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err = read_profile(fprof, ¬_found); |
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fclose(fprof); |
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if (err) |
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return err; |
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if (not_found) { |
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warn("%d profile functions could not be found in the map file - are you sure that your profile data and map file correspond?\n", |
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not_found); |
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return 1; |
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} |
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} |
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return 0; |
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} |
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static int regex_report_error(regex_t *regex, int err, const char *op, |
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const char *name) |
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{ |
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char buf[200]; |
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regerror(err, regex, buf, sizeof(buf)); |
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error("Regex error '%s' in %s '%s'\n", buf, op, name); |
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return -1; |
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} |
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static void check_trace_config_line(struct trace_configline_info *item) |
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{ |
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struct func_info *func, *end; |
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int err; |
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debug("Checking trace config line '%s'\n", item->name); |
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for (func = func_list, end = func + func_count; func < end; func++) { |
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err = regexec(&item->regex, func->name, 0, NULL, 0); |
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debug(" - regex '%s', string '%s': %d\n", item->name, |
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func->name, err); |
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if (err == REG_NOMATCH) |
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continue; |
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if (err) { |
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regex_report_error(&item->regex, err, "match", |
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item->name); |
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break; |
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} |
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/* It matches, so perform the action */ |
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switch (item->type) { |
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case TRACE_LINE_INCLUDE: |
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info(" include %s at %lx\n", func->name, |
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text_offset + func->offset); |
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func->flags |= FUNCF_TRACE; |
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break; |
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case TRACE_LINE_EXCLUDE: |
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info(" exclude %s at %lx\n", func->name, |
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text_offset + func->offset); |
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func->flags &= ~FUNCF_TRACE; |
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break; |
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} |
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} |
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} |
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static void check_trace_config(void) |
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{ |
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struct trace_configline_info *line; |
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for (line = trace_config_head; line; line = line->next) |
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check_trace_config_line(line); |
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} |
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/** |
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* Check the functions to see if they each have an objsection. If not, then |
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* the linker must have eliminated them. |
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*/ |
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static void check_functions(void) |
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{ |
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struct func_info *func, *end; |
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unsigned long removed_code_size = 0; |
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int not_found = 0; |
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/* Look for missing functions */ |
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for (func = func_list, end = func + func_count; func < end; func++) { |
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if (!func->objsection) { |
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removed_code_size += func->code_size; |
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not_found++; |
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} |
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} |
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/* Figure out what functions we want to trace */ |
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check_trace_config(); |
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warn("%d functions removed by linker, %ld code size\n", |
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not_found, removed_code_size); |
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} |
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static int read_trace_config(FILE *fin) |
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{ |
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char buff[200]; |
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int linenum = 0; |
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struct trace_configline_info **tailp = &trace_config_head; |
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while (fgets(buff, sizeof(buff), fin)) { |
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int len = strlen(buff); |
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struct trace_configline_info *line; |
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char *saveptr; |
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char *s, *tok; |
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int err; |
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linenum++; |
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if (len && buff[len - 1] == '\n') |
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buff[len - 1] = '\0'; |
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/* skip blank lines and comments */ |
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for (s = buff; *s == ' ' || *s == '\t'; s++) |
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; |
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if (!*s || *s == '#') |
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continue; |
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line = (struct trace_configline_info *)calloc(1, |
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sizeof(*line)); |
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if (!line) { |
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error("Cannot allocate config line\n"); |
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return -1; |
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} |
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tok = strtok_r(s, " \t", &saveptr); |
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if (!tok) { |
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error("Invalid trace config data on line %d\n", |
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linenum); |
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return -1; |
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} |
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if (0 == strcmp(tok, "include-func")) { |
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line->type = TRACE_LINE_INCLUDE; |
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} else if (0 == strcmp(tok, "exclude-func")) { |
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line->type = TRACE_LINE_EXCLUDE; |
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} else { |
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error("Unknown command in trace config data line %d\n", |
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linenum); |
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return -1; |
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} |
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tok = strtok_r(NULL, " \t", &saveptr); |
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if (!tok) { |
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error("Missing pattern in trace config data line %d\n", |
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linenum); |
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return -1; |
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} |
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err = regcomp(&line->regex, tok, REG_NOSUB); |
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if (err) { |
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int r = regex_report_error(&line->regex, err, |
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"compile", tok); |
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free(line); |
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return r; |
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} |
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/* link this new one to the end of the list */ |
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line->name = strdup(tok); |
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line->next = NULL; |
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*tailp = line; |
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tailp = &line->next; |
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} |
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if (!feof(fin)) { |
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error("Cannot read from trace config file at position %ld\n", |
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ftell(fin)); |
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return -1; |
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} |
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return 0; |
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} |
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static int read_trace_config_file(const char *fname) |
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{ |
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FILE *fin; |
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int err; |
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fin = fopen(fname, "r"); |
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if (!fin) { |
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error("Cannot open trace_config file '%s'\n", fname); |
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return -1; |
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} |
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err = read_trace_config(fin); |
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fclose(fin); |
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return err; |
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} |
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static void out_func(ulong func_offset, int is_caller, const char *suffix) |
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{ |
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struct func_info *func; |
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func = (is_caller ? find_caller_by_offset : find_func_by_offset) |
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(func_offset); |
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if (func) |
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printf("%s%s", func->name, suffix); |
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else |
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printf("%lx%s", func_offset, suffix); |
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} |
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/* |
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* # tracer: function |
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* # |
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* # TASK-PID CPU# TIMESTAMP FUNCTION |
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* # | | | | | |
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* # bash-4251 [01] 10152.583854: path_put <-path_walk |
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* # bash-4251 [01] 10152.583855: dput <-path_put |
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* # bash-4251 [01] 10152.583855: _atomic_dec_and_lock <-dput |
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*/ |
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static int make_ftrace(void) |
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{ |
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struct trace_call *call; |
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int missing_count = 0, skip_count = 0; |
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int i; |
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printf("# tracer: ftrace\n" |
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"#\n" |
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"# TASK-PID CPU# TIMESTAMP FUNCTION\n" |
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"# | | | | |\n"); |
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for (i = 0, call = call_list; i < call_count; i++, call++) { |
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struct func_info *func = find_func_by_offset(call->func); |
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ulong time = call->flags & FUNCF_TIMESTAMP_MASK; |
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if (TRACE_CALL_TYPE(call) != FUNCF_ENTRY && |
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TRACE_CALL_TYPE(call) != FUNCF_EXIT) |
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continue; |
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if (!func) { |
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warn("Cannot find function at %lx\n", |
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text_offset + call->func); |
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missing_count++; |
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continue; |
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} |
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if (!(func->flags & FUNCF_TRACE)) { |
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debug("Funcion '%s' is excluded from trace\n", |
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func->name); |
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skip_count++; |
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continue; |
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} |
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printf("%16s-%-5d [01] %lu.%06lu: ", "uboot", 1, |
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time / 1000000, time % 1000000); |
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out_func(call->func, 0, " <- "); |
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out_func(call->caller, 1, "\n"); |
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} |
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info("ftrace: %d functions not found, %d excluded\n", missing_count, |
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skip_count); |
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return 0; |
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} |
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static int prof_tool(int argc, char * const argv[], |
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const char *prof_fname, const char *map_fname, |
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const char *trace_config_fname) |
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{ |
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int err = 0; |
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if (read_map_file(map_fname)) |
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return -1; |
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if (prof_fname && read_profile_file(prof_fname)) |
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return -1; |
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if (trace_config_fname && read_trace_config_file(trace_config_fname)) |
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return -1; |
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check_functions(); |
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for (; argc; argc--, argv++) { |
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const char *cmd = *argv; |
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if (0 == strcmp(cmd, "dump-ftrace")) |
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err = make_ftrace(); |
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else |
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warn("Unknown command '%s'\n", cmd); |
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} |
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return err; |
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} |
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int main(int argc, char *argv[]) |
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{ |
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const char *map_fname = "System.map"; |
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const char *prof_fname = NULL; |
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const char *trace_config_fname = NULL; |
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int opt; |
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verbose = 2; |
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while ((opt = getopt(argc, argv, "m:p:t:v:")) != -1) { |
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switch (opt) { |
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case 'm': |
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map_fname = optarg; |
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break; |
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case 'p': |
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prof_fname = optarg; |
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break; |
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case 't': |
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trace_config_fname = optarg; |
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break; |
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case 'v': |
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verbose = atoi(optarg); |
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break; |
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default: |
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usage(); |
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} |
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} |
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argc -= optind; argv += optind; |
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if (argc < 1) |
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usage(); |
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debug("Debug enabled\n"); |
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return prof_tool(argc, argv, prof_fname, map_fname, |
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trace_config_fname); |
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}
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