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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)) len = sizeof(task_id);
  101.  
  102.     ipc_data_read_finalize(callid, &task_id, len);
  103.     ipc_answer_0(rid, EOK);
  104. }
  105.  
  106.  
  107. /** Receive a call setting pathname of the program to execute.
  108.  *
  109.  * @param rid
  110.  * @param request
  111.  */
  112. static void loader_set_pathname(ipc_callid_t rid, ipc_call_t *request)
  113. {
  114.     ipc_callid_t callid;
  115.     size_t len;
  116.     char *name_buf;
  117.  
  118.     if (!ipc_data_write_receive(&callid, &len)) {
  119.         ipc_answer_0(callid, EINVAL);
  120.         ipc_answer_0(rid, EINVAL);
  121.         return;
  122.     }
  123.  
  124.     name_buf = malloc(len + 1);
  125.     if (!name_buf) {
  126.         ipc_answer_0(callid, ENOMEM);
  127.         ipc_answer_0(rid, ENOMEM);
  128.         return;
  129.     }
  130.  
  131.     ipc_data_write_finalize(callid, name_buf, len);
  132.     ipc_answer_0(rid, EOK);
  133.  
  134.     if (pathname != NULL) {
  135.         free(pathname);
  136.         pathname = NULL;
  137.     }
  138.  
  139.     name_buf[len] = '\0';
  140.     pathname = name_buf;
  141. }
  142.  
  143. /** Receive a call setting arguments of the program to execute.
  144.  *
  145.  * @param rid
  146.  * @param request
  147.  */
  148. static void loader_set_args(ipc_callid_t rid, ipc_call_t *request)
  149. {
  150.     ipc_callid_t callid;
  151.     size_t buf_len, arg_len;
  152.     char *p;
  153.     int n;
  154.  
  155.     if (!ipc_data_write_receive(&callid, &buf_len)) {
  156.         ipc_answer_0(callid, EINVAL);
  157.         ipc_answer_0(rid, EINVAL);
  158.         return;
  159.     }
  160.  
  161.     if (arg_buf != NULL) {
  162.         free(arg_buf);
  163.         arg_buf = NULL;
  164.     }
  165.  
  166.     if (argv != NULL) {
  167.         free(argv);
  168.         argv = NULL;
  169.     }
  170.  
  171.     arg_buf = malloc(buf_len + 1);
  172.     if (!arg_buf) {
  173.         ipc_answer_0(callid, ENOMEM);
  174.         ipc_answer_0(rid, ENOMEM);
  175.         return;
  176.     }
  177.  
  178.     ipc_data_write_finalize(callid, arg_buf, buf_len);
  179.     ipc_answer_0(rid, EOK);
  180.  
  181.     arg_buf[buf_len] = '\0';
  182.  
  183.     /*
  184.      * Count number of arguments
  185.      */
  186.     p = arg_buf;
  187.     n = 0;
  188.     while (p < arg_buf + buf_len) {
  189.         arg_len = strlen(p);
  190.         p = p + arg_len + 1;
  191.         ++n;
  192.     }
  193.  
  194.     /* Allocate argv */
  195.     argv = malloc((n + 1) * sizeof(char *));
  196.  
  197.     if (argv == NULL) {
  198.         free(arg_buf);
  199.         ipc_answer_0(callid, ENOMEM);
  200.         ipc_answer_0(rid, ENOMEM);
  201.         return;
  202.     }
  203.  
  204.     /*
  205.      * Fill argv with argument pointers
  206.      */
  207.     p = arg_buf;
  208.     n = 0;
  209.     while (p < arg_buf + buf_len) {
  210.         argv[n] = p;
  211.  
  212.         arg_len = strlen(p);
  213.         p = p + arg_len + 1;
  214.         ++n;
  215.     }
  216.  
  217.     argc = n;
  218.     argv[n] = NULL;
  219. }
  220.  
  221. /** Load the previously selected program.
  222.  *
  223.  * @param rid
  224.  * @param request
  225.  * @return 0 on success, !0 on error.
  226.  */
  227. static int loader_load(ipc_callid_t rid, ipc_call_t *request)
  228. {
  229.     int rc;
  230.  
  231.     rc = elf_load_file(pathname, 0, &prog_info);
  232.     if (rc < 0) {
  233.         DPRINTF("Failed to load executable '%s'.\n", pathname);
  234.         ipc_answer_0(rid, EINVAL);
  235.         return 1;
  236.     }
  237.  
  238.     elf_create_pcb(&prog_info, &pcb);
  239.  
  240.     pcb.argc = argc;
  241.     pcb.argv = argv;
  242.  
  243.     if (prog_info.interp == NULL) {
  244.         /* Statically linked program */
  245.         is_dyn_linked = false;
  246.         ipc_answer_0(rid, EOK);
  247.         return 0;
  248.     }
  249.  
  250.     rc = elf_load_file(prog_info.interp, 0, &interp_info);
  251.     if (rc < 0) {
  252.         DPRINTF("Failed to load interpreter '%s.'\n",
  253.             prog_info.interp);
  254.         ipc_answer_0(rid, EINVAL);
  255.         return 1;
  256.     }
  257.  
  258.     is_dyn_linked = true;
  259.     ipc_answer_0(rid, EOK);
  260.  
  261.     return 0;
  262. }
  263.  
  264.  
  265. /** Run the previously loaded program.
  266.  *
  267.  * @param rid
  268.  * @param request
  269.  * @return 0 on success, !0 on error.
  270.  */
  271. static void loader_run(ipc_callid_t rid, ipc_call_t *request)
  272. {
  273.     if (is_dyn_linked == true) {
  274.         /* Dynamically linked program */
  275.         DPRINTF("Run ELF interpreter.\n");
  276.         DPRINTF("Entry point: 0x%lx\n", interp_info.entry);
  277.         close_console();
  278.  
  279.         ipc_answer_0(rid, EOK);
  280.         elf_run(&interp_info, &pcb);
  281.  
  282.     } else {
  283.         /* Statically linked program */
  284.         close_console();
  285.         ipc_answer_0(rid, EOK);
  286.         elf_run(&prog_info, &pcb);
  287.     }
  288.  
  289.     /* Not reached */
  290. }
  291.  
  292. /** Handle loader connection.
  293.  *
  294.  * Receive and carry out commands (of which the last one should be
  295.  * to execute the loaded program).
  296.  */
  297. static void loader_connection(ipc_callid_t iid, ipc_call_t *icall)
  298. {
  299.     ipc_callid_t callid;
  300.     ipc_call_t call;
  301.     int retval;
  302.  
  303.     /* Already have a connection? */
  304.     if (connected) {
  305.         ipc_answer_0(iid, ELIMIT);
  306.         return;
  307.     }
  308.  
  309.     connected = true;
  310.    
  311.     /* Accept the connection */
  312.     ipc_answer_0(iid, EOK);
  313.  
  314.     /* Ignore parameters, the connection is already open */
  315.     (void)iid; (void)icall;
  316.  
  317.     while (1) {
  318.         callid = async_get_call(&call);
  319.  
  320.         switch (IPC_GET_METHOD(call)) {
  321.         case IPC_M_PHONE_HUNGUP:
  322.             exit(0);
  323.         case LOADER_GET_TASKID:
  324.             loader_get_taskid(callid, &call);
  325.             continue;
  326.         case LOADER_SET_PATHNAME:
  327.             loader_set_pathname(callid, &call);
  328.             continue;
  329.         case LOADER_SET_ARGS:
  330.             loader_set_args(callid, &call);
  331.             continue;
  332.         case LOADER_LOAD:
  333.             loader_load(callid, &call);
  334.             continue;
  335.         case LOADER_RUN:
  336.             loader_run(callid, &call);
  337.             /* Not reached */
  338.         default:
  339.             retval = ENOENT;
  340.             break;
  341.         }
  342.         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
  343.             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
  344.             DPRINTF("Responding EINVAL to method %d.\n",
  345.                 IPC_GET_METHOD(call));
  346.             ipc_answer_0(callid, EINVAL);
  347.         }
  348.     }
  349. }
  350.  
  351. /** Program loader main function.
  352.  */
  353. int main(int argc, char *argv[])
  354. {
  355.     ipcarg_t phonead;
  356.  
  357.     connected = false;
  358.    
  359.     /* Set a handler of incomming connections. */
  360.     async_set_client_connection(loader_connection);
  361.  
  362.     /* Register at naming service. */
  363.     if (ipc_connect_to_me(PHONE_NS, SERVICE_LOAD, 0, 0, &phonead) != 0)
  364.         return -1;
  365.    
  366.     async_manager();
  367.  
  368.     /* Never reached */
  369.     return 0;
  370. }
  371.  
  372. /** @}
  373.  */
  374.