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  1. /*
  2.  * Copyright (c) 2005 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup genericdebug
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  * @brief Kernel symbol resolver.
  36.  */
  37.  
  38. #include <symtab.h>
  39. #include <byteorder.h>
  40. #include <string.h>
  41. #include <print.h>
  42. #include <arch/types.h>
  43. #include <typedefs.h>
  44. #include <errno.h>
  45.  
  46. /** Get name of a symbol that seems most likely to correspond to address.
  47.  *
  48.  * @param addr Address.
  49.  * @param name Place to store pointer to the symbol name.
  50.  *
  51.  * @return Zero on success or negative error code, ENOENT if not found,
  52.  *         ENOTSUP if symbol table not available.
  53.  *
  54.  */
  55. int symtab_name_lookup(unative_t addr, char **name)
  56. {
  57. #ifdef CONFIG_SYMTAB
  58.     size_t i;
  59.    
  60.     for (i = 1; symbol_table[i].address_le; i++) {
  61.         if (addr < uint64_t_le2host(symbol_table[i].address_le))
  62.             break;
  63.     }
  64.    
  65.     if (addr >= uint64_t_le2host(symbol_table[i - 1].address_le)) {
  66.         *name = symbol_table[i - 1].symbol_name;
  67.         return EOK;
  68.     }
  69.    
  70.     *name = NULL;
  71.     return ENOENT;
  72.    
  73. #else
  74.     *name = NULL;
  75.     return ENOTSUP;
  76. #endif
  77. }
  78.  
  79. /** Lookup symbol by address and format for display.
  80.  *
  81.  * Returns name of closest corresponding symbol, "Not found" if none exists
  82.  * or "N/A" if no symbol information is available.
  83.  *
  84.  * @param addr Address.
  85.  * @param name Place to store pointer to the symbol name.
  86.  *
  87.  * @return Pointer to a human-readable string.
  88.  *
  89.  */
  90. char *symtab_fmt_name_lookup(unative_t addr)
  91. {
  92.     char *name;
  93.     int rc = symtab_name_lookup(addr, &name);
  94.    
  95.     switch (rc) {
  96.     case EOK:
  97.         return name;
  98.     case ENOENT:
  99.         return "Not found";
  100.     default:
  101.         return "N/A";
  102.     }
  103. }
  104.  
  105. #ifdef CONFIG_SYMTAB
  106.  
  107. /** Find symbols that match the parameter forward and print them.
  108.  *
  109.  * @param name     Search string
  110.  * @param startpos Starting position, changes to found position
  111.  *
  112.  * @return Pointer to the part of string that should be completed or NULL.
  113.  *
  114.  */
  115. static const char *symtab_search_one(const char *name, size_t *startpos)
  116. {
  117.     size_t namelen = str_length(name);
  118.    
  119.     size_t pos;
  120.     for (pos = *startpos; symbol_table[pos].address_le; pos++) {
  121.         const char *curname = symbol_table[pos].symbol_name;
  122.        
  123.         /* Find a ':' in curname */
  124.         const char *colon = str_chr(curname, ':');
  125.         if (colon == NULL)
  126.             continue;
  127.        
  128.         if (str_length(curname) < namelen)
  129.             continue;
  130.        
  131.         if (str_lcmp(name, curname, namelen) == 0) {
  132.             *startpos = pos;
  133.             return (curname + str_lsize(curname, namelen));
  134.         }
  135.     }
  136.    
  137.     return NULL;
  138. }
  139.  
  140. #endif
  141.  
  142. /** Return address that corresponds to the entry.
  143.  *
  144.  * Search symbol table, and if there is one match, return it
  145.  *
  146.  * @param name Name of the symbol
  147.  * @param addr Place to store symbol address
  148.  *
  149.  * @return Zero on success, ENOENT - not found, EOVERFLOW - duplicate
  150.  *         symbol, ENOTSUP - no symbol information available.
  151.  *
  152.  */
  153. int symtab_addr_lookup(const char *name, uintptr_t *addr)
  154. {
  155. #ifdef CONFIG_SYMTAB
  156.     size_t found = 0;
  157.     size_t pos = 0;
  158.     const char *hint;
  159.    
  160.     while ((hint = symtab_search_one(name, &pos))) {
  161.         if (str_length(hint) == 0) {
  162.             *addr = uint64_t_le2host(symbol_table[pos].address_le);
  163.             found++;
  164.         }
  165.         pos++;
  166.     }
  167.    
  168.     if (found > 1)
  169.         return EOVERFLOW;
  170.    
  171.     if (found < 1)
  172.         return ENOENT;
  173.    
  174.     return EOK;
  175.    
  176. #else
  177.     return ENOTSUP;
  178. #endif
  179. }
  180.  
  181. /** Find symbols that match parameter and print them */
  182. void symtab_print_search(const char *name)
  183. {
  184. #ifdef CONFIG_SYMTAB
  185.     size_t pos = 0;
  186.     while (symtab_search_one(name, &pos)) {
  187.         uintptr_t addr = uint64_t_le2host(symbol_table[pos].address_le);
  188.         char *realname = symbol_table[pos].symbol_name;
  189.         printf("%p: %s\n", addr, realname);
  190.         pos++;
  191.     }
  192.    
  193. #else
  194.     printf("No symbol information available.\n");
  195. #endif
  196. }
  197.  
  198. /** Symtab completion
  199.  *
  200.  * @param input Search string, completes to symbol name
  201.  * @param size  Input buffer size
  202.  *
  203.  * @return 0 - nothing found, 1 - success, >1 print duplicates
  204.  *
  205.  */
  206. int symtab_compl(char *input, size_t size)
  207. {
  208. #ifdef CONFIG_SYMTAB
  209.     const char *name = input;
  210.    
  211.     /* Allow completion of pointers */
  212.     if ((name[0] == '*') || (name[0] == '&'))
  213.         name++;
  214.    
  215.     /* Do not print all symbols */
  216.     if (str_length(name) == 0)
  217.         return 0;
  218.    
  219.     size_t found = 0;
  220.     size_t pos = 0;
  221.     const char *hint;
  222.     char output[MAX_SYMBOL_NAME];
  223.    
  224.     output[0] = 0;
  225.    
  226.     while ((hint = symtab_search_one(name, &pos))) {
  227.         if ((found == 0) || (str_length(output) > str_length(hint)))
  228.             str_cpy(output, MAX_SYMBOL_NAME, hint);
  229.        
  230.         pos++;
  231.         found++;
  232.     }
  233.    
  234.     if ((found > 1) && (str_length(output) != 0)) {
  235.         printf("\n");
  236.         pos = 0;
  237.         while ((hint = symtab_search_one(name, &pos))) {
  238.             printf("%s\n", symbol_table[pos].symbol_name);
  239.             pos++;
  240.         }
  241.     }
  242.    
  243.     if (found > 0)
  244.         str_cpy(input, size, output);
  245.    
  246.     return found;
  247.    
  248. #else
  249.     return 0;
  250. #endif
  251. }
  252.  
  253. /** @}
  254.  */
  255.