tools/lib/symbol/kallsyms.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "symbol/kallsyms.h"
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5
   6 u8 kallsyms2elf_type(char type)
   7 {
   8         type = tolower(type);
   9         return (type == 't' || type == 'w') ? STT_FUNC : STT_OBJECT;
  10 }
  11
  12 bool kallsyms__is_function(char symbol_type)
  13 {
  14         symbol_type = toupper(symbol_type);
  15         return symbol_type == 'T' || symbol_type == 'W';
  16 }
  17
  18 /*
  19  * While we find nice hex chars, build a long_val.
  20  * Return number of chars processed.
  21  */
  22 int hex2u64(const char *ptr, u64 *long_val)
  23 {
  24         char *p;
  25
  26         *long_val = strtoull(ptr, &p, 16);
  27
  28         return p - ptr;
  29 }
  30
  31 int kallsyms__parse(const char *filename, void *arg,
  32                     int (*process_symbol)(void *arg, const char *name,
  33                                           char type, u64 start))
  34 {
  35         char *line = NULL;
  36         size_t n;
  37         int err = -1;
  38         FILE *file = fopen(filename, "r");
  39
  40         if (file == NULL)
  41                 goto out_failure;
  42
  43         err = 0;
  44
  45         while (!feof(file)) {
  46                 u64 start;
  47                 int line_len, len;
  48                 char symbol_type;
  49                 char *symbol_name;
  50
  51                 line_len = getline(&line, &n, file);
  52                 if (line_len < 0 || !line)
  53                         break;
  54
  55                 line[--line_len] = '\0'; /* \n */
  56
  57                 len = hex2u64(line, &start);
  58
  59                 /* Skip the line if we failed to parse the address. */
  60                 if (!len)
  61                         continue;
  62
  63                 len++;
  64                 if (len + 2 >= line_len)
  65                         continue;
  66
  67                 symbol_type = line[len];
  68                 len += 2;
  69                 symbol_name = line + len;
  70                 len = line_len - len;
  71
  72                 if (len >= KSYM_NAME_LEN) {
  73                         err = -1;
  74                         break;
  75                 }
  76
  77                 err = process_symbol(arg, symbol_name, symbol_type, start);
  78                 if (err)
  79                         break;
  80         }
  81
  82         free(line);
  83         fclose(file);
  84         return err;
  85
  86 out_failure:
  87         return -1;
  88 }