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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. /** @addtogroup genericconsole
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file    kconsole.c
  35.  * @brief   Kernel console.
  36.  *
  37.  * This file contains kernel thread managing the kernel console.
  38.  */
  39.  
  40. #include <console/kconsole.h>
  41. #include <console/console.h>
  42. #include <console/chardev.h>
  43. #include <console/cmd.h>
  44. #include <print.h>
  45. #include <panic.h>
  46. #include <arch/types.h>
  47. #include <adt/list.h>
  48. #include <arch.h>
  49. #include <macros.h>
  50. #include <debug.h>
  51. #include <func.h>
  52. #include <symtab.h>
  53. #include <macros.h>
  54.  
  55. /** Simple kernel console.
  56.  *
  57.  * The console is realized by kernel thread kconsole.
  58.  * It doesn't understand any useful command on its own,
  59.  * but makes it possible for other kernel subsystems to
  60.  * register their own commands.
  61.  */
  62.  
  63. /** Locking.
  64.  *
  65.  * There is a list of cmd_info_t structures. This list
  66.  * is protected by cmd_lock spinlock. Note that specially
  67.  * the link elements of cmd_info_t are protected by
  68.  * this lock.
  69.  *
  70.  * Each cmd_info_t also has its own lock, which protects
  71.  * all elements thereof except the link element.
  72.  *
  73.  * cmd_lock must be acquired before any cmd_info lock.
  74.  * When locking two cmd info structures, structure with
  75.  * lower address must be locked first.
  76.  */
  77.  
  78. SPINLOCK_INITIALIZE(cmd_lock);  /**< Lock protecting command list. */
  79. LIST_INITIALIZE(cmd_head);  /**< Command list. */
  80.  
  81. static cmd_info_t *parse_cmdline(char *cmdline, size_t len);
  82. static bool parse_argument(char *cmdline, size_t len, index_t *start,
  83.     index_t *end);
  84. static char history[KCONSOLE_HISTORY][MAX_CMDLINE] = {};
  85.  
  86. /** Initialize kconsole data structures. */
  87. void kconsole_init(void)
  88. {
  89.     int i;
  90.  
  91.     cmd_init();
  92.     for (i = 0; i < KCONSOLE_HISTORY; i++)
  93.         history[i][0] = '\0';
  94. }
  95.  
  96.  
  97. /** Register kconsole command.
  98.  *
  99.  * @param cmd Structure describing the command.
  100.  *
  101.  * @return 0 on failure, 1 on success.
  102.  */
  103. int cmd_register(cmd_info_t *cmd)
  104. {
  105.     link_t *cur;
  106.    
  107.     spinlock_lock(&cmd_lock);
  108.    
  109.     /*
  110.      * Make sure the command is not already listed.
  111.      */
  112.     for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
  113.         cmd_info_t *hlp;
  114.        
  115.         hlp = list_get_instance(cur, cmd_info_t, link);
  116.  
  117.         if (hlp == cmd) {
  118.             /* The command is already there. */
  119.             spinlock_unlock(&cmd_lock);
  120.             return 0;
  121.         }
  122.  
  123.         /* Avoid deadlock. */
  124.         if (hlp < cmd) {
  125.             spinlock_lock(&hlp->lock);
  126.             spinlock_lock(&cmd->lock);
  127.         } else {
  128.             spinlock_lock(&cmd->lock);
  129.             spinlock_lock(&hlp->lock);
  130.         }
  131.         if ((strncmp(hlp->name, cmd->name, max(strlen(cmd->name),
  132.             strlen(hlp->name))) == 0)) {
  133.             /* The command is already there. */
  134.             spinlock_unlock(&hlp->lock);
  135.             spinlock_unlock(&cmd->lock);
  136.             spinlock_unlock(&cmd_lock);
  137.             return 0;
  138.         }
  139.        
  140.         spinlock_unlock(&hlp->lock);
  141.         spinlock_unlock(&cmd->lock);
  142.     }
  143.    
  144.     /*
  145.      * Now the command can be added.
  146.      */
  147.     list_append(&cmd->link, &cmd_head);
  148.    
  149.     spinlock_unlock(&cmd_lock);
  150.     return 1;
  151. }
  152.  
  153. /** Print count times a character */
  154. static void rdln_print_c(char ch, int count)
  155. {
  156.     int i;
  157.     for (i = 0; i < count; i++)
  158.         putchar(ch);
  159. }
  160.  
  161. /** Insert character to string */
  162. static void insert_char(char *str, char ch, int pos)
  163. {
  164.     int i;
  165.    
  166.     for (i = strlen(str); i > pos; i--)
  167.         str[i] = str[i - 1];
  168.     str[pos] = ch;
  169. }
  170.  
  171. /** Try to find a command beginning with prefix */
  172. static const char * cmdtab_search_one(const char *name,link_t **startpos)
  173. {
  174.     size_t namelen = strlen(name);
  175.     const char *curname;
  176.  
  177.     spinlock_lock(&cmd_lock);
  178.  
  179.     if (!*startpos)
  180.         *startpos = cmd_head.next;
  181.  
  182.     for (; *startpos != &cmd_head; *startpos = (*startpos)->next) {
  183.         cmd_info_t *hlp;
  184.         hlp = list_get_instance(*startpos, cmd_info_t, link);
  185.  
  186.         curname = hlp->name;
  187.         if (strlen(curname) < namelen)
  188.             continue;
  189.         if (strncmp(curname, name, namelen) == 0) {
  190.             spinlock_unlock(&cmd_lock);
  191.             return curname+namelen;
  192.         }
  193.     }
  194.     spinlock_unlock(&cmd_lock);
  195.     return NULL;
  196. }
  197.  
  198.  
  199. /** Command completion of the commands
  200.  *
  201.  * @param name - string to match, changed to hint on exit
  202.  * @return number of found matches
  203.  */
  204. static int cmdtab_compl(char *name)
  205. {
  206.     static char output[MAX_SYMBOL_NAME+1];
  207.     link_t *startpos = NULL;
  208.     const char *foundtxt;
  209.     int found = 0;
  210.     int i;
  211.  
  212.     output[0] = '\0';
  213.     while ((foundtxt = cmdtab_search_one(name, &startpos))) {
  214.         startpos = startpos->next;
  215.         if (!found)
  216.             strncpy(output, foundtxt, strlen(foundtxt)+1);
  217.         else {
  218.             for (i = 0; output[i] && foundtxt[i] &&
  219.                 output[i] == foundtxt[i]; i++)
  220.                 ;
  221.             output[i] = '\0';
  222.         }
  223.         found++;
  224.     }
  225.     if (!found)
  226.         return 0;
  227.  
  228.     if (found > 1 && !strlen(output)) {
  229.         printf("\n");
  230.         startpos = NULL;
  231.         while ((foundtxt = cmdtab_search_one(name, &startpos))) {
  232.             cmd_info_t *hlp;
  233.             hlp = list_get_instance(startpos, cmd_info_t, link);
  234.             printf("%s - %s\n", hlp->name, hlp->description);
  235.             startpos = startpos->next;
  236.         }
  237.     }
  238.     strncpy(name, output, MAX_SYMBOL_NAME);
  239.     return found;
  240.    
  241. }
  242.  
  243. static char * clever_readline(const char *prompt, chardev_t *input)
  244. {
  245.     static int histposition = 0;
  246.  
  247.     static char tmp[MAX_CMDLINE+1];
  248.     int curlen = 0, position = 0;
  249.     char *current = history[histposition];
  250.     int i;
  251.     char mod; /* Command Modifier */
  252.     char c;
  253.  
  254.     printf("%s> ", prompt);
  255.     while (1) {
  256.         c = _getc(input);
  257.         if (c == '\n') {
  258.             putchar(c);
  259.             break;
  260.         } if (c == '\b') { /* Backspace */
  261.             if (position == 0)
  262.                 continue;
  263.             for (i = position; i < curlen; i++)
  264.                 current[i - 1] = current[i];
  265.             curlen--;
  266.             position--;
  267.             putchar('\b');
  268.             for (i = position; i < curlen; i++)
  269.                 putchar(current[i]);
  270.             putchar(' ');
  271.             rdln_print_c('\b', curlen - position + 1);
  272.             continue;
  273.         }
  274.         if (c == '\t') { /* Tabulator */
  275.             int found;
  276.  
  277.             /* Move to the end of the word */
  278.             for (; position < curlen && current[position] != ' ';
  279.                 position++)
  280.                 putchar(current[position]);
  281.             /* Copy to tmp last word */
  282.             for (i = position - 1; i >= 0 && current[i] != ' '; i--)
  283.                 ;
  284.             /* If word begins with * or &, skip it */
  285.             if (tmp[0] == '*' || tmp[0] == '&')
  286.                 for (i = 1; tmp[i]; i++)
  287.                     tmp[i - 1] = tmp[i];
  288.             i++; /* I is at the start of the word */
  289.             strncpy(tmp, current + i, position - i + 1);
  290.  
  291.             if (i == 0) { /* Command completion */
  292.                 found = cmdtab_compl(tmp);
  293.             } else { /* Symtab completion */
  294.                 found = symtab_compl(tmp);
  295.             }
  296.  
  297.             if (found == 0)
  298.                 continue;
  299.             for (i = 0; tmp[i] && curlen < MAX_CMDLINE;
  300.                 i++, curlen++)
  301.                 insert_char(current, tmp[i], i + position);
  302.  
  303.             if (strlen(tmp) || found == 1) { /* If we have a hint */
  304.                 for (i = position; i < curlen; i++)
  305.                     putchar(current[i]);
  306.                 position += strlen(tmp);
  307.                 /* Add space to end */
  308.                 if (found == 1 && position == curlen &&
  309.                     curlen < MAX_CMDLINE) {
  310.                     current[position] = ' ';
  311.                     curlen++;
  312.                     position++;
  313.                     putchar(' ');
  314.                 }
  315.             } else { /* No hint, table was printed */
  316.                 printf("%s> ", prompt);
  317.                 for (i = 0; i < curlen; i++)
  318.                     putchar(current[i]);
  319.                 position += strlen(tmp);
  320.             }
  321.             rdln_print_c('\b', curlen - position);
  322.             continue;
  323.         }
  324.         if (c == 0x1b) { /* Special command */
  325.             mod = _getc(input);
  326.             c = _getc(input);
  327.  
  328.             if (mod != 0x5b && mod != 0x4f)
  329.                 continue;
  330.  
  331.             if (c == 0x33 && _getc(input) == 0x7e) {
  332.                 /* Delete */
  333.                 if (position == curlen)
  334.                     continue;
  335.                 for (i = position + 1; i < curlen; i++) {
  336.                     putchar(current[i]);
  337.                     current[i - 1] = current[i];
  338.                 }
  339.                 putchar(' ');
  340.                 rdln_print_c('\b', curlen - position);
  341.                 curlen--;
  342.             } else if (c == 0x48) { /* Home */
  343.                 rdln_print_c('\b', position);
  344.                 position = 0;
  345.             } else if (c == 0x46) {  /* End */
  346.                 for (i = position; i < curlen; i++)
  347.                     putchar(current[i]);
  348.                 position = curlen;
  349.             } else if (c == 0x44) { /* Left */
  350.                 if (position > 0) {
  351.                     putchar('\b');
  352.                     position--;
  353.                 }
  354.                 continue;
  355.             } else if (c == 0x43) { /* Right */
  356.                 if (position < curlen) {
  357.                     putchar(current[position]);
  358.                     position++;
  359.                 }
  360.                 continue;
  361.             } else if (c == 0x41 || c == 0x42) {
  362.                                 /* Up, down */
  363.                 rdln_print_c('\b', position);
  364.                 rdln_print_c(' ', curlen);
  365.                 rdln_print_c('\b', curlen);
  366.                 if (c == 0x41) /* Up */
  367.                     histposition--;
  368.                 else
  369.                     histposition++;
  370.                 if (histposition < 0) {
  371.                     histposition = KCONSOLE_HISTORY - 1;
  372.                 } else {
  373.                     histposition =
  374.                         histposition % KCONSOLE_HISTORY;
  375.                 }
  376.                 current = history[histposition];
  377.                 printf("%s", current);
  378.                 curlen = strlen(current);
  379.                 position = curlen;
  380.                 continue;
  381.             }
  382.             continue;
  383.         }
  384.         if (curlen >= MAX_CMDLINE)
  385.             continue;
  386.  
  387.         insert_char(current, c, position);
  388.  
  389.         curlen++;
  390.         for (i = position; i < curlen; i++)
  391.             putchar(current[i]);
  392.         position++;
  393.         rdln_print_c('\b',curlen - position);
  394.     }
  395.     if (curlen) {
  396.         histposition++;
  397.         histposition = histposition % KCONSOLE_HISTORY;
  398.     }
  399.     current[curlen] = '\0';
  400.     return current;
  401. }
  402.  
  403. /** Kernel console managing thread.
  404.  *
  405.  * @param prompt Kernel console prompt (e.g kconsole/panic).
  406.  */
  407. void kconsole(void *prompt)
  408. {
  409.     cmd_info_t *cmd_info;
  410.     count_t len;
  411.     char *cmdline;
  412.  
  413.     if (!stdin) {
  414.         printf("%s: no stdin\n", __func__);
  415.         return;
  416.     }
  417.    
  418.     while (true) {
  419.         cmdline = clever_readline((char *) prompt, stdin);
  420.         len = strlen(cmdline);
  421.         if (!len)
  422.             continue;
  423.         cmd_info = parse_cmdline(cmdline, len);
  424.         if (!cmd_info)
  425.             continue;
  426.         if (strncmp(cmd_info->name, "exit",
  427.             min(strlen(cmd_info->name), 5)) == 0)
  428.             break;
  429.         (void) cmd_info->func(cmd_info->argv);
  430.     }
  431. }
  432.  
  433. static int parse_int_arg(char *text, size_t len, unative_t *result)
  434. {
  435.     static char symname[MAX_SYMBOL_NAME];
  436.     uintptr_t symaddr;
  437.     bool isaddr = false;
  438.     bool isptr = false;
  439.    
  440.     /* If we get a name, try to find it in symbol table */
  441.     if (text[0] == '&') {
  442.         isaddr = true;
  443.         text++;
  444.         len--;
  445.     } else if (text[0] == '*') {
  446.         isptr = true;
  447.         text++;
  448.         len--;
  449.     }
  450.     if (text[0] < '0' || text[0] > '9') {
  451.         strncpy(symname, text, min(len + 1, MAX_SYMBOL_NAME));
  452.         symaddr = get_symbol_addr(symname);
  453.         if (!symaddr) {
  454.             printf("Symbol %s not found.\n", symname);
  455.             return -1;
  456.         }
  457.         if (symaddr == (uintptr_t) -1) {
  458.             printf("Duplicate symbol %s.\n", symname);
  459.             symtab_print_search(symname);
  460.             return -1;
  461.         }
  462.         if (isaddr)
  463.             *result = (unative_t)symaddr;
  464.         else if (isptr)
  465.             *result = **((unative_t **)symaddr);
  466.         else
  467.             *result = *((unative_t *)symaddr);
  468.     } else { /* It's a number - convert it */
  469.         *result = atoi(text);
  470.         if (isptr)
  471.             *result = *((unative_t *)*result);
  472.     }
  473.  
  474.     return 0;
  475. }
  476.  
  477. /** Parse command line.
  478.  *
  479.  * @param cmdline Command line as read from input device.
  480.  * @param len Command line length.
  481.  *
  482.  * @return Structure describing the command.
  483.  */
  484. cmd_info_t *parse_cmdline(char *cmdline, size_t len)
  485. {
  486.     index_t start = 0, end = 0;
  487.     cmd_info_t *cmd = NULL;
  488.     link_t *cur;
  489.     count_t i;
  490.     int error = 0;
  491.    
  492.     if (!parse_argument(cmdline, len, &start, &end)) {
  493.         /* Command line did not contain alphanumeric word. */
  494.         return NULL;
  495.     }
  496.  
  497.     spinlock_lock(&cmd_lock);
  498.    
  499.     for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
  500.         cmd_info_t *hlp;
  501.        
  502.         hlp = list_get_instance(cur, cmd_info_t, link);
  503.         spinlock_lock(&hlp->lock);
  504.        
  505.         if (strncmp(hlp->name, &cmdline[start], max(strlen(hlp->name),
  506.             end - start + 1)) == 0) {
  507.             cmd = hlp;
  508.             break;
  509.         }
  510.        
  511.         spinlock_unlock(&hlp->lock);
  512.     }
  513.    
  514.     spinlock_unlock(&cmd_lock);
  515.    
  516.     if (!cmd) {
  517.         /* Unknown command. */
  518.         printf("Unknown command.\n");
  519.         return NULL;
  520.     }
  521.  
  522.     /* cmd == hlp is locked */
  523.    
  524.     /*
  525.      * The command line must be further analyzed and
  526.      * the parameters therefrom must be matched and
  527.      * converted to those specified in the cmd info
  528.      * structure.
  529.      */
  530.  
  531.     for (i = 0; i < cmd->argc; i++) {
  532.         char *buf;
  533.         start = end + 1;
  534.         if (!parse_argument(cmdline, len, &start, &end)) {
  535.             printf("Too few arguments.\n");
  536.             spinlock_unlock(&cmd->lock);
  537.             return NULL;
  538.         }
  539.        
  540.         error = 0;
  541.         switch (cmd->argv[i].type) {
  542.         case ARG_TYPE_STRING:
  543.             buf = (char *) cmd->argv[i].buffer;
  544.             strncpy(buf, (const char *) &cmdline[start],
  545.                 min((end - start) + 2, cmd->argv[i].len));
  546.             buf[min((end - start) + 1, cmd->argv[i].len - 1)] = '\0';
  547.             break;
  548.         case ARG_TYPE_INT:
  549.             if (parse_int_arg(cmdline + start, end - start + 1,
  550.                 &cmd->argv[i].intval))
  551.                 error = 1;
  552.             break;
  553.         case ARG_TYPE_VAR:
  554.             if (start != end && cmdline[start] == '"' &&
  555.                 cmdline[end] == '"') {
  556.                 buf = (char *) cmd->argv[i].buffer;
  557.                 strncpy(buf, (const char *) &cmdline[start + 1],
  558.                     min((end-start), cmd->argv[i].len));
  559.                 buf[min((end - start), cmd->argv[i].len - 1)] =
  560.                     '\0';
  561.                 cmd->argv[i].intval = (unative_t) buf;
  562.                 cmd->argv[i].vartype = ARG_TYPE_STRING;
  563.             } else if (!parse_int_arg(cmdline + start, end - start + 1,
  564.                 &cmd->argv[i].intval)) {
  565.                 cmd->argv[i].vartype = ARG_TYPE_INT;
  566.             } else {
  567.                 printf("Unrecognized variable argument.\n");
  568.                 error = 1;
  569.             }
  570.             break;
  571.         case ARG_TYPE_INVALID:
  572.         default:
  573.             printf("invalid argument type\n");
  574.             error = 1;
  575.             break;
  576.         }
  577.     }
  578.    
  579.     if (error) {
  580.         spinlock_unlock(&cmd->lock);
  581.         return NULL;
  582.     }
  583.    
  584.     start = end + 1;
  585.     if (parse_argument(cmdline, len, &start, &end)) {
  586.         printf("Too many arguments.\n");
  587.         spinlock_unlock(&cmd->lock);
  588.         return NULL;
  589.     }
  590.    
  591.     spinlock_unlock(&cmd->lock);
  592.     return cmd;
  593. }
  594.  
  595. /** Parse argument.
  596.  *
  597.  * Find start and end positions of command line argument.
  598.  *
  599.  * @param cmdline Command line as read from the input device.
  600.  * @param len Number of characters in cmdline.
  601.  * @param start On entry, 'start' contains pointer to the index
  602.  *        of first unprocessed character of cmdline.
  603.  *        On successful exit, it marks beginning of the next argument.
  604.  * @param end Undefined on entry. On exit, 'end' points to the last character
  605.  *        of the next argument.
  606.  *
  607.  * @return false on failure, true on success.
  608.  */
  609. bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end)
  610. {
  611.     index_t i;
  612.     bool found_start = false;
  613.    
  614.     ASSERT(start != NULL);
  615.     ASSERT(end != NULL);
  616.    
  617.     for (i = *start; i < len; i++) {
  618.         if (!found_start) {
  619.             if (is_white(cmdline[i]))
  620.                 (*start)++;
  621.             else
  622.                 found_start = true;
  623.         } else {
  624.             if (is_white(cmdline[i]))
  625.                 break;
  626.         }
  627.     }
  628.     *end = i - 1;
  629.  
  630.     return found_start;
  631. }
  632.  
  633. /** @}
  634.  */
  635.