tools/lib/symbol/kallsyms.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <ctype.h>
   3 #include "symbol/kallsyms.h"
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6
   7 u8 kallsyms2elf_type(char type)
   8 {
   9         type = tolower(type);
  10         return (type == 't' || type == 'w') ? STT_FUNC : STT_OBJECT;
  11 }
  12
  13 int kallsyms__parse(const char *filename, void *arg,
  14                     int (*process_symbol)(void *arg, const char *name,
  15                                           char type, u64 start))
  16 {
  17         char *line = NULL;
  18         size_t n;
  19         int err = -1;
  20         FILE *file = fopen(filename, "r");
  21
  22         if (file == NULL)
  23                 goto out_failure;
  24
  25         err = 0;
  26
  27         while (!feof(file)) {
  28                 u64 start;
  29                 int line_len, len;
  30                 char symbol_type;
  31                 char *symbol_name;
  32
  33                 line_len = getline(&line, &n, file);
  34                 if (line_len < 0 || !line)
  35                         break;
  36
  37                 line[--line_len] = '\0'; /* \n */
  38
  39                 len = hex2u64(line, &start);
  40
  41                 len++;
  42                 if (len + 2 >= line_len)
  43                         continue;
  44
  45                 symbol_type = line[len];
  46                 len += 2;
  47                 symbol_name = line + len;
  48                 len = line_len - len;
  49
  50                 if (len >= KSYM_NAME_LEN) {
  51                         err = -1;
  52                         break;
  53                 }
  54
  55                 err = process_symbol(arg, symbol_name, symbol_type, start);
  56                 if (err)
  57                         break;
  58         }
  59
  60         free(line);
  61         fclose(file);
  62         return err;
  63
  64 out_failure:
  65         return -1;
  66 }