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