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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  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. #include <console/kconsole.h>
  30. #include <console/console.h>
  31. #include <console/chardev.h>
  32. #include <console/cmd.h>
  33. #include <print.h>
  34. #include <panic.h>
  35. #include <typedefs.h>
  36. #include <arch/types.h>
  37. #include <list.h>
  38. #include <arch.h>
  39. #include <macros.h>
  40. #include <debug.h>
  41. #include <func.h>
  42. #include <symtab.h>
  43. #include <macros.h>
  44.  
  45. /** Simple kernel console.
  46.  *
  47.  * The console is realized by kernel thread kconsole.
  48.  * It doesn't understand any useful command on its own,
  49.  * but makes it possible for other kernel subsystems to
  50.  * register their own commands.
  51.  */
  52.  
  53. /** Locking.
  54.  *
  55.  * There is a list of cmd_info_t structures. This list
  56.  * is protected by cmd_lock spinlock. Note that specially
  57.  * the link elements of cmd_info_t are protected by
  58.  * this lock.
  59.  *
  60.  * Each cmd_info_t also has its own lock, which protects
  61.  * all elements thereof except the link element.
  62.  *
  63.  * cmd_lock must be acquired before any cmd_info lock.
  64.  * When locking two cmd info structures, structure with
  65.  * lower address must be locked first.
  66.  */
  67.  
  68. SPINLOCK_INITIALIZE(cmd_lock);  /**< Lock protecting command list. */
  69. LIST_INITIALIZE(cmd_head);  /**< Command list. */
  70.  
  71. static cmd_info_t *parse_cmdline(char *cmdline, size_t len);
  72. static bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end);
  73. static char history[KCONSOLE_HISTORY][MAX_CMDLINE] = {};
  74.  
  75. /** Initialize kconsole data structures. */
  76. void kconsole_init(void)
  77. {
  78.     int i;
  79.  
  80.     cmd_init();
  81.     for (i=0; i<KCONSOLE_HISTORY; i++)
  82.         history[i][0] = '\0';
  83. }
  84.  
  85.  
  86. /** Register kconsole command.
  87.  *
  88.  * @param cmd Structure describing the command.
  89.  *
  90.  * @return 0 on failure, 1 on success.
  91.  */
  92. int cmd_register(cmd_info_t *cmd)
  93. {
  94.     link_t *cur;
  95.    
  96.     spinlock_lock(&cmd_lock);
  97.    
  98.     /*
  99.      * Make sure the command is not already listed.
  100.      */
  101.     for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
  102.         cmd_info_t *hlp;
  103.        
  104.         hlp = list_get_instance(cur, cmd_info_t, link);
  105.  
  106.         if (hlp == cmd) {
  107.             /* The command is already there. */
  108.             spinlock_unlock(&cmd_lock);
  109.             return 0;
  110.         }
  111.  
  112.         /* Avoid deadlock. */
  113.         if (hlp < cmd) {
  114.             spinlock_lock(&hlp->lock);
  115.             spinlock_lock(&cmd->lock);
  116.         } else {
  117.             spinlock_lock(&cmd->lock);
  118.             spinlock_lock(&hlp->lock);
  119.         }
  120.        
  121.         if ((strncmp(hlp->name, cmd->name, strlen(cmd->name)) == 0)) {
  122.             /* The command is already there. */
  123.             spinlock_unlock(&hlp->lock);
  124.             spinlock_unlock(&cmd->lock);
  125.             spinlock_unlock(&cmd_lock);
  126.             return 0;
  127.         }
  128.        
  129.         spinlock_unlock(&hlp->lock);
  130.         spinlock_unlock(&cmd->lock);
  131.     }
  132.    
  133.     /*
  134.      * Now the command can be added.
  135.      */
  136.     list_append(&cmd->link, &cmd_head);
  137.    
  138.     spinlock_unlock(&cmd_lock);
  139.     return 1;
  140. }
  141.  
  142. static void rdln_print_c(char ch, int count)
  143. {
  144.     int i;
  145.     for (i=0;i<count;i++)
  146.         putchar(ch);
  147. }
  148.  
  149. static void insert_char(char *str, char ch, int pos)
  150. {
  151.     int i;
  152.    
  153.     for (i=strlen(str);i > pos; i--)
  154.         str[i] = str[i-1];
  155.     str[pos] = ch;
  156. }
  157.  
  158. static const char * cmdtab_search_one(const char *name,link_t **startpos)
  159. {
  160.     int namelen = strlen(name);
  161.     const char *curname;
  162.  
  163.     spinlock_lock(&cmd_lock);
  164.  
  165.     if (!*startpos)
  166.         *startpos = cmd_head.next;
  167.  
  168.     for (;*startpos != &cmd_head;*startpos = (*startpos)->next) {
  169.         cmd_info_t *hlp;
  170.         hlp = list_get_instance(*startpos, cmd_info_t, link);
  171.  
  172.         curname = hlp->name;
  173.         if (strlen(curname) < namelen)
  174.             continue;
  175.         if (strncmp(curname, name, namelen) == 0) {
  176.             spinlock_unlock(&cmd_lock);
  177.             return curname+namelen;
  178.         }
  179.     }
  180.     spinlock_unlock(&cmd_lock);
  181.     return NULL;
  182. }
  183.  
  184.  
  185. /** Command completion of the commands
  186.  *
  187.  * @param name - string to match, changed to hint on exit
  188.  * @return number of found matches
  189.  */
  190. static int cmdtab_compl(char *name)
  191. {
  192.     char output[MAX_SYMBOL_NAME+1];
  193.     link_t *startpos = NULL;
  194.     const char *foundtxt;
  195.     int found = 0;
  196.     int i;
  197.  
  198.     output[0] = '\0';
  199.     while ((foundtxt = cmdtab_search_one(name, &startpos))) {
  200.         startpos = startpos->next;
  201.         if (!found)
  202.             strncpy(output, foundtxt, strlen(foundtxt)+1);
  203.         else {
  204.             for (i=0; output[i] && foundtxt[i] && output[i]==foundtxt[i]; i++)
  205.                 ;
  206.             output[i] = '\0';
  207.         }
  208.         found++;
  209.     }
  210.     if (!found)
  211.         return 0;
  212.  
  213.     if (found > 1 && !strlen(output)) {
  214.         printf("\n");
  215.         startpos = NULL;
  216.         while ((foundtxt = cmdtab_search_one(name, &startpos))) {
  217.             cmd_info_t *hlp;
  218.             hlp = list_get_instance(startpos, cmd_info_t, link);
  219.             printf("%s - %s\n", hlp->name, hlp->description);
  220.             startpos = startpos->next;
  221.         }
  222.     }
  223.     strncpy(name, output, MAX_SYMBOL_NAME);
  224.     return found;
  225.    
  226. }
  227.  
  228. static char * clever_readline(const char *prompt, chardev_t *input)
  229. {
  230.     static int histposition = 0;
  231.  
  232.     char tmp[MAX_CMDLINE+1];
  233.     int curlen = 0, position = 0;
  234.     char *current = history[histposition];
  235.     int i;
  236.     char mod; /* Command Modifier */
  237.     char c;
  238.  
  239.     printf("%s> ", prompt);
  240.     while (1) {
  241.         c = _getc(input);
  242.         if (c == '\n') {
  243.             putchar(c);
  244.             break;
  245.         } if (c == '\b') { /* Backspace */
  246.             if (position == 0)
  247.                 continue;
  248.             for (i=position; i<curlen;i++)
  249.                 current[i-1] = current[i];
  250.             curlen--;
  251.             position--;
  252.             putchar('\b');
  253.             for (i=position;i<curlen;i++)
  254.                 putchar(current[i]);
  255.             putchar(' ');
  256.             rdln_print_c('\b',curlen-position+1);
  257.             continue;
  258.         }
  259.         if (c == '\t') { /* Tabulator */
  260.             int found;
  261.  
  262.             /* Move to the end of the word */
  263.             for (;position<curlen && current[position]!=' ';position++)
  264.                 putchar(current[position]);
  265.             /* Copy to tmp last word */
  266.             for (i=position-1;i >= 0 && current[i]!=' ' ;i--)
  267.                 ;
  268.             /* If word begins with * or &, skip it */
  269.             if (tmp[0] == '*' || tmp[0] == '&')
  270.                 for (i=1;tmp[i];i++)
  271.                     tmp[i-1] = tmp[i];
  272.             i++; /* I is at the start of the word */
  273.             strncpy(tmp, current+i, position-i+1);
  274.  
  275.             if (i==0) { /* Command completion */
  276.                 found = cmdtab_compl(tmp);
  277.             } else { /* Symtab completion */
  278.                 found = symtab_compl(tmp);
  279.             }
  280.  
  281.             if (found == 0)
  282.                 continue;
  283.             for (i=0;tmp[i] && curlen < MAX_CMDLINE;i++,curlen++)
  284.                 insert_char(current, tmp[i], i+position);
  285.  
  286.             if (strlen(tmp) || found==1) { /* If we have a hint */
  287.                 for (i=position;i<curlen;i++)
  288.                     putchar(current[i]);
  289.                 position += strlen(tmp);
  290.                 /* Add space to end */
  291.                 if (found == 1 && position == curlen && \
  292.                     curlen < MAX_CMDLINE) {
  293.                     current[position] = ' ';
  294.                     curlen++;
  295.                     position++;
  296.                     putchar(' ');
  297.                 }
  298.             } else { /* No hint, table was printed */
  299.                 printf("%s> ", prompt);
  300.                 for (i=0; i<curlen;i++)
  301.                     putchar(current[i]);
  302.                 position += strlen(tmp);
  303.             }
  304.             rdln_print_c('\b', curlen-position);
  305.             continue;
  306.         }
  307.         if (c == 0x1b) { /* Special command */
  308.             mod = _getc(input);
  309.             c = _getc(input);
  310.  
  311.             if (mod != 0x5b && mod != 0x4f)
  312.                 continue;
  313.  
  314.             if (c == 0x33 && _getc(input) == 0x7e) {
  315.                 /* Delete */
  316.                 if (position == curlen)
  317.                     continue;
  318.                 for (i=position+1; i<curlen;i++) {
  319.                     putchar(current[i]);
  320.                     current[i-1] = current[i];
  321.                 }
  322.                 putchar(' ');
  323.                 rdln_print_c('\b',curlen-position);
  324.                 curlen--;
  325.             }
  326.             else if (c == 0x48) { /* Home */
  327.                 rdln_print_c('\b',position);
  328.                 position = 0;
  329.             }
  330.             else if (c == 0x46) {  /* End */
  331.                 for (i=position;i<curlen;i++)
  332.                     putchar(current[i]);
  333.                 position = curlen;
  334.             }
  335.             else if (c == 0x44) { /* Left */
  336.                 if (position > 0) {
  337.                     putchar('\b');
  338.                     position--;
  339.                 }
  340.                 continue;
  341.             }
  342.             else if (c == 0x43) { /* Right */
  343.                 if (position < curlen) {
  344.                     putchar(current[position]);
  345.                     position++;
  346.                 }
  347.                 continue;
  348.             }
  349.             else if (c == 0x41 || c == 0x42) {
  350.                                 /* Up,down */
  351.                 rdln_print_c('\b',position);
  352.                 rdln_print_c(' ',curlen);
  353.                 rdln_print_c('\b',curlen);
  354.                 if (c == 0x41) /* Up */
  355.                     histposition--;
  356.                 else
  357.                     histposition++;
  358.                 if (histposition < 0)
  359.                     histposition = KCONSOLE_HISTORY -1 ;
  360.                 else
  361.                     histposition =  histposition % KCONSOLE_HISTORY;
  362.                 current = history[histposition];
  363.                 printf("%s", current);
  364.                 curlen = strlen(current);
  365.                 position = curlen;
  366.                 continue;
  367.             }
  368.             continue;
  369.         }
  370.         if (curlen >= MAX_CMDLINE)
  371.             continue;
  372.  
  373.         insert_char(current, c, position);
  374.  
  375.         curlen++;
  376.         for (i=position;i<curlen;i++)
  377.             putchar(current[i]);
  378.         position++;
  379.         rdln_print_c('\b',curlen-position);
  380.     }
  381.     if (curlen) {
  382.         histposition++;
  383.         histposition = histposition % KCONSOLE_HISTORY;
  384.     }
  385.     current[curlen] = '\0';
  386.     return current;
  387. }
  388.  
  389. /** Kernel console managing thread.
  390.  *
  391.  * @param arg Not used.
  392.  */
  393. void kconsole(void *prompt)
  394. {
  395.     cmd_info_t *cmd_info;
  396.     count_t len;
  397.     char *cmdline;
  398.  
  399.     if (!stdin) {
  400.         printf("%s: no stdin\n", __FUNCTION__);
  401.         return;
  402.     }
  403.    
  404.     while (true) {
  405.         cmdline = clever_readline(prompt, stdin);
  406.         len = strlen(cmdline);
  407.         if (!len)
  408.             continue;
  409.         cmd_info = parse_cmdline(cmdline, len);
  410.         if (!cmd_info)
  411.             continue;
  412.         if (strncmp(cmd_info->name,"exit", \
  413.                 min(strlen(cmd_info->name),5)) == 0)
  414.             break;
  415.         (void) cmd_info->func(cmd_info->argv);
  416.     }
  417. }
  418.  
  419. static int parse_int_arg(char *text, size_t len, __native *result)
  420. {
  421.     char symname[MAX_SYMBOL_NAME];
  422.     __address symaddr;
  423.     bool isaddr = false;
  424.     bool isptr = false;
  425.    
  426.     /* If we get a name, try to find it in symbol table */
  427.     if (text[0] < '0' || text[0] > '9') {
  428.         if (text[0] == '&') {
  429.             isaddr = true;
  430.             text++;len--;
  431.         } else if (text[0] == '*') {
  432.             isptr = true;
  433.             text++;len--;
  434.         }
  435.         strncpy(symname, text, min(len+1, MAX_SYMBOL_NAME));
  436.         symaddr = get_symbol_addr(symname);
  437.         if (!symaddr) {
  438.             printf("Symbol %s not found.\n",symname);
  439.             return -1;
  440.         }
  441.         if (symaddr == (__address) -1) {
  442.             printf("Duplicate symbol %s.\n",symname);
  443.             symtab_print_search(symname);
  444.             return -1;
  445.         }
  446.         if (isaddr)
  447.             *result = (__native)symaddr;
  448.         else if (isptr)
  449.             *result = **((__native **)symaddr);
  450.         else
  451.             *result = *((__native *)symaddr);
  452.     } else /* It's a number - convert it */
  453.         *result = atoi(text);
  454.     return 0;
  455. }
  456.  
  457. /** Parse command line.
  458.  *
  459.  * @param cmdline Command line as read from input device.
  460.  * @param len Command line length.
  461.  *
  462.  * @return Structure describing the command.
  463.  */
  464. cmd_info_t *parse_cmdline(char *cmdline, size_t len)
  465. {
  466.     index_t start = 0, end = 0;
  467.     cmd_info_t *cmd = NULL;
  468.     link_t *cur;
  469.     int i;
  470.    
  471.     if (!parse_argument(cmdline, len, &start, &end)) {
  472.         /* Command line did not contain alphanumeric word. */
  473.         return NULL;
  474.     }
  475.  
  476.     spinlock_lock(&cmd_lock);
  477.    
  478.     for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
  479.         cmd_info_t *hlp;
  480.        
  481.         hlp = list_get_instance(cur, cmd_info_t, link);
  482.         spinlock_lock(&hlp->lock);
  483.        
  484.         if (strncmp(hlp->name, &cmdline[start], strlen(hlp->name)) == 0) {
  485.             cmd = hlp;
  486.             break;
  487.         }
  488.        
  489.         spinlock_unlock(&hlp->lock);
  490.     }
  491.    
  492.     spinlock_unlock(&cmd_lock);
  493.    
  494.     if (!cmd) {
  495.         /* Unknown command. */
  496.         printf("Unknown command.\n");
  497.         return NULL;
  498.     }
  499.  
  500.     /* cmd == hlp is locked */
  501.    
  502.     /*
  503.      * The command line must be further analyzed and
  504.      * the parameters therefrom must be matched and
  505.      * converted to those specified in the cmd info
  506.      * structure.
  507.      */
  508.  
  509.     for (i = 0; i < cmd->argc; i++) {
  510.         char *buf;
  511.         start = end + 1;
  512.         if (!parse_argument(cmdline, len, &start, &end)) {
  513.             printf("Too few arguments.\n");
  514.             spinlock_unlock(&cmd->lock);
  515.             return NULL;
  516.         }
  517.        
  518.         switch (cmd->argv[i].type) {
  519.         case ARG_TYPE_STRING:
  520.                 buf = cmd->argv[i].buffer;
  521.                 strncpy(buf, (const char *) &cmdline[start], min((end - start) + 2, cmd->argv[i].len));
  522.             buf[min((end - start) + 1, cmd->argv[i].len - 1)] = '\0';
  523.             break;
  524.         case ARG_TYPE_INT:
  525.             if (parse_int_arg(cmdline+start, end-start+1,
  526.                       &cmd->argv[i].intval))
  527.                 return NULL;
  528.             break;
  529.         case ARG_TYPE_VAR:
  530.             if (start != end && cmdline[start] == '"' && cmdline[end] == '"') {
  531.                 buf = cmd->argv[i].buffer;
  532.                 strncpy(buf, (const char *) &cmdline[start+1],
  533.                     min((end-start), cmd->argv[i].len));
  534.                 buf[min((end - start), cmd->argv[i].len - 1)] = '\0';
  535.                 cmd->argv[i].intval = (__native) buf;
  536.                 cmd->argv[i].vartype = ARG_TYPE_STRING;
  537.             } else if (!parse_int_arg(cmdline+start, end-start+1,
  538.                          &cmd->argv[i].intval))
  539.                 cmd->argv[i].vartype = ARG_TYPE_INT;
  540.             else {
  541.                 printf("Unrecognized variable argument.\n");
  542.                 return NULL;
  543.             }
  544.             break;
  545.         case ARG_TYPE_INVALID:
  546.         default:
  547.             printf("invalid argument type\n");
  548.             return NULL;
  549.             break;
  550.         }
  551.     }
  552.    
  553.     start = end + 1;
  554.     if (parse_argument(cmdline, len, &start, &end)) {
  555.         printf("Too many arguments.\n");
  556.         spinlock_unlock(&cmd->lock);
  557.         return NULL;
  558.     }
  559.    
  560.     spinlock_unlock(&cmd->lock);
  561.     return cmd;
  562. }
  563.  
  564. /** Parse argument.
  565.  *
  566.  * Find start and end positions of command line argument.
  567.  *
  568.  * @param cmdline Command line as read from the input device.
  569.  * @param len Number of characters in cmdline.
  570.  * @param start On entry, 'start' contains pointer to the index
  571.  *        of first unprocessed character of cmdline.
  572.  *        On successful exit, it marks beginning of the next argument.
  573.  * @param end Undefined on entry. On exit, 'end' points to the last character
  574.  *        of the next argument.
  575.  *
  576.  * @return false on failure, true on success.
  577.  */
  578. bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end)
  579. {
  580.     int i;
  581.     bool found_start = false;
  582.    
  583.     ASSERT(start != NULL);
  584.     ASSERT(end != NULL);
  585.    
  586.     for (i = *start; i < len; i++) {
  587.         if (!found_start) {
  588.             if (is_white(cmdline[i]))
  589.                 (*start)++;
  590.             else
  591.                 found_start = true;
  592.         } else {
  593.             if (is_white(cmdline[i]))
  594.                 break;
  595.         }
  596.     }
  597.     *end = i - 1;
  598.  
  599.     return found_start;
  600. }
  601.