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  1. /*
  2.  * Copyright (c) 2008 Jiri Svoboda
  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 loader
  30.  * @brief Loads and runs programs from VFS.
  31.  * @{
  32.  */
  33. /**
  34.  * @file
  35.  * @brief Loads and runs programs from VFS.
  36.  *
  37.  * The program loader is a special init binary. Its image is used
  38.  * to create a new task upon a @c task_spawn syscall. The syscall
  39.  * returns the id of a phone connected to the newly created task.
  40.  *
  41.  * The caller uses this phone to send the pathname and various other
  42.  * information to the loader. This is normally done by the C library
  43.  * and completely hidden from applications.
  44.  */
  45.  
  46. #include <stdio.h>
  47. #include <stdlib.h>
  48. #include <unistd.h>
  49. #include <bool.h>
  50. #include <fcntl.h>
  51. #include <sys/types.h>
  52. #include <ipc/ipc.h>
  53. #include <ipc/services.h>
  54. #include <ipc/loader.h>
  55. #include <loader/pcb.h>
  56. #include <errno.h>
  57. #include <async.h>
  58. #include <as.h>
  59.  
  60. #include <elf.h>
  61. #include <elf_load.h>
  62.  
  63. #define DPRINTF(...)
  64.  
  65. /** Pathname of the file that will be loaded */
  66. static char *pathname = NULL;
  67.  
  68. /** The Program control block */
  69. static pcb_t pcb;
  70.  
  71. /** Number of arguments */
  72. static int argc = 0;
  73. /** Argument vector */
  74. static char **argv = NULL;
  75. /** Buffer holding all arguments */
  76. static char *arg_buf = NULL;
  77.  
  78. static elf_info_t prog_info;
  79. static elf_info_t interp_info;
  80.  
  81. static bool is_dyn_linked;
  82.  
  83. /** Used to limit number of connections to one. */
  84. static bool connected;
  85.  
  86. static void loader_get_taskid(ipc_callid_t rid, ipc_call_t *request)
  87. {
  88.     ipc_callid_t callid;
  89.     task_id_t task_id;
  90.     size_t len;
  91.    
  92.     task_id = task_get_id();
  93.    
  94.     if (!ipc_data_read_receive(&callid, &len)) {
  95.         ipc_answer_0(callid, EINVAL);
  96.         ipc_answer_0(rid, EINVAL);
  97.         return;
  98.     }
  99.    
  100.     if (len > sizeof(task_id))
  101.         len = sizeof(task_id);
  102.    
  103.     ipc_data_read_finalize(callid, &task_id, len);
  104.     ipc_answer_0(rid, EOK);
  105. }
  106.  
  107.  
  108. /** Receive a call setting pathname of the program to execute.
  109.  *
  110.  * @param rid
  111.  * @param request
  112.  */
  113. static void loader_set_pathname(ipc_callid_t rid, ipc_call_t *request)
  114. {
  115.     ipc_callid_t callid;
  116.     size_t len;
  117.     char *name_buf;
  118.    
  119.     if (!ipc_data_write_receive(&callid, &len)) {
  120.         ipc_answer_0(callid, EINVAL);
  121.         ipc_answer_0(rid, EINVAL);
  122.         return;
  123.     }
  124.    
  125.     name_buf = malloc(len + 1);
  126.     if (!name_buf) {
  127.         ipc_answer_0(callid, ENOMEM);
  128.         ipc_answer_0(rid, ENOMEM);
  129.         return;
  130.     }
  131.    
  132.     ipc_data_write_finalize(callid, name_buf, len);
  133.     ipc_answer_0(rid, EOK);
  134.    
  135.     if (pathname != NULL) {
  136.         free(pathname);
  137.         pathname = NULL;
  138.     }
  139.    
  140.     name_buf[len] = '\0';
  141.     pathname = name_buf;
  142. }
  143.  
  144. /** Receive a call setting arguments of the program to execute.
  145.  *
  146.  * @param rid
  147.  * @param request
  148.  */
  149. static void loader_set_args(ipc_callid_t rid, ipc_call_t *request)
  150. {
  151.     ipc_callid_t callid;
  152.     size_t buf_len, arg_len;
  153.     char *p;
  154.     int n;
  155.    
  156.     if (!ipc_data_write_receive(&callid, &buf_len)) {
  157.         ipc_answer_0(callid, EINVAL);
  158.         ipc_answer_0(rid, EINVAL);
  159.         return;
  160.     }
  161.    
  162.     if (arg_buf != NULL) {
  163.         free(arg_buf);
  164.         arg_buf = NULL;
  165.     }
  166.    
  167.     if (argv != NULL) {
  168.         free(argv);
  169.         argv = NULL;
  170.     }
  171.    
  172.     arg_buf = malloc(buf_len + 1);
  173.     if (!arg_buf) {
  174.         ipc_answer_0(callid, ENOMEM);
  175.         ipc_answer_0(rid, ENOMEM);
  176.         return;
  177.     }
  178.    
  179.     ipc_data_write_finalize(callid, arg_buf, buf_len);
  180.     ipc_answer_0(rid, EOK);
  181.    
  182.     arg_buf[buf_len] = '\0';
  183.    
  184.     /*
  185.      * Count number of arguments
  186.      */
  187.     p = arg_buf;
  188.     n = 0;
  189.     while (p < arg_buf + buf_len) {
  190.         arg_len = strlen(p);
  191.         p = p + arg_len + 1;
  192.         ++n;
  193.     }
  194.    
  195.     /* Allocate argv */
  196.     argv = malloc((n + 1) * sizeof(char *));
  197.    
  198.     if (argv == NULL) {
  199.         free(arg_buf);
  200.         ipc_answer_0(callid, ENOMEM);
  201.         ipc_answer_0(rid, ENOMEM);
  202.         return;
  203.     }
  204.    
  205.     /*
  206.      * Fill argv with argument pointers
  207.      */
  208.     p = arg_buf;
  209.     n = 0;
  210.     while (p < arg_buf + buf_len) {
  211.         argv[n] = p;
  212.        
  213.         arg_len = strlen(p);
  214.         p = p + arg_len + 1;
  215.         ++n;
  216.     }
  217.    
  218.     argc = n;
  219.     argv[n] = NULL;
  220. }
  221.  
  222. /** Load the previously selected program.
  223.  *
  224.  * @param rid
  225.  * @param request
  226.  * @return 0 on success, !0 on error.
  227.  */
  228. static int loader_load(ipc_callid_t rid, ipc_call_t *request)
  229. {
  230.     int rc;
  231.    
  232.     rc = elf_load_file(pathname, 0, &prog_info);
  233.     if (rc < 0) {
  234.         DPRINTF("Failed to load executable '%s'.\n", pathname);
  235.         ipc_answer_0(rid, EINVAL);
  236.         return 1;
  237.     }
  238.    
  239.     elf_create_pcb(&prog_info, &pcb);
  240.    
  241.     pcb.argc = argc;
  242.     pcb.argv = argv;
  243.    
  244.     if (prog_info.interp == NULL) {
  245.         /* Statically linked program */
  246.         is_dyn_linked = false;
  247.         ipc_answer_0(rid, EOK);
  248.         return 0;
  249.     }
  250.    
  251.     rc = elf_load_file(prog_info.interp, 0, &interp_info);
  252.     if (rc < 0) {
  253.         DPRINTF("Failed to load interpreter '%s.'\n",
  254.             prog_info.interp);
  255.         ipc_answer_0(rid, EINVAL);
  256.         return 1;
  257.     }
  258.    
  259.     is_dyn_linked = true;
  260.     ipc_answer_0(rid, EOK);
  261.    
  262.     return 0;
  263. }
  264.  
  265.  
  266. /** Run the previously loaded program.
  267.  *
  268.  * @param rid
  269.  * @param request
  270.  * @return 0 on success, !0 on error.
  271.  */
  272. static void loader_run(ipc_callid_t rid, ipc_call_t *request)
  273. {
  274.     const char *cp;
  275.    
  276.     /* Set the task name. */
  277.     cp = strrchr(pathname, '/');
  278.     cp = (cp == NULL) ? pathname : (cp + 1);
  279.     task_set_name(cp);
  280.    
  281.     if (is_dyn_linked == true) {
  282.         /* Dynamically linked program */
  283.         DPRINTF("Run ELF interpreter.\n");
  284.         DPRINTF("Entry point: 0x%lx\n", interp_info.entry);
  285.         close_console();
  286.        
  287.         ipc_answer_0(rid, EOK);
  288.         elf_run(&interp_info, &pcb);
  289.     } else {
  290.         /* Statically linked program */
  291.         close_console();
  292.         ipc_answer_0(rid, EOK);
  293.         elf_run(&prog_info, &pcb);
  294.     }
  295.  
  296.     /* Not reached */
  297. }
  298.  
  299. /** Handle loader connection.
  300.  *
  301.  * Receive and carry out commands (of which the last one should be
  302.  * to execute the loaded program).
  303.  */
  304. static void loader_connection(ipc_callid_t iid, ipc_call_t *icall)
  305. {
  306.     ipc_callid_t callid;
  307.     ipc_call_t call;
  308.     int retval;
  309.    
  310.     /* Already have a connection? */
  311.     if (connected) {
  312.         ipc_answer_0(iid, ELIMIT);
  313.         return;
  314.     }
  315.    
  316.     connected = true;
  317.    
  318.     /* Accept the connection */
  319.     ipc_answer_0(iid, EOK);
  320.    
  321.     /* Ignore parameters, the connection is already open */
  322.     (void) iid;
  323.     (void) icall;
  324.    
  325.     while (1) {
  326.         callid = async_get_call(&call);
  327.        
  328.         switch (IPC_GET_METHOD(call)) {
  329.         case IPC_M_PHONE_HUNGUP:
  330.             exit(0);
  331.         case LOADER_GET_TASKID:
  332.             loader_get_taskid(callid, &call);
  333.             continue;
  334.         case LOADER_SET_PATHNAME:
  335.             loader_set_pathname(callid, &call);
  336.             continue;
  337.         case LOADER_SET_ARGS:
  338.             loader_set_args(callid, &call);
  339.             continue;
  340.         case LOADER_LOAD:
  341.             loader_load(callid, &call);
  342.             continue;
  343.         case LOADER_RUN:
  344.             loader_run(callid, &call);
  345.             /* Not reached */
  346.         default:
  347.             retval = ENOENT;
  348.             break;
  349.         }
  350.         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
  351.             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
  352.             DPRINTF("Responding EINVAL to method %d.\n",
  353.                 IPC_GET_METHOD(call));
  354.             ipc_answer_0(callid, EINVAL);
  355.         }
  356.     }
  357. }
  358.  
  359. /** Program loader main function.
  360.  */
  361. int main(int argc, char *argv[])
  362. {
  363.     ipcarg_t phonead;
  364.    
  365.     connected = false;
  366.    
  367.     /* Set a handler of incomming connections. */
  368.     async_set_client_connection(loader_connection);
  369.    
  370.     /* Register at naming service. */
  371.     if (ipc_connect_to_me(PHONE_NS, SERVICE_LOAD, 0, 0, &phonead) != 0)
  372.         return -1;
  373.    
  374.     async_manager();
  375.    
  376.     /* Never reached */
  377.     return 0;
  378. }
  379.  
  380. /** @}
  381.  */
  382.