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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/loader.h>
  54. #include <loader/pcb.h>
  55. #include <errno.h>
  56. #include <async.h>
  57. #include <as.h>
  58.  
  59. #include <elf.h>
  60. #include <elf_load.h>
  61.  
  62. /** Pathname of the file that will be loaded */
  63. static char *pathname = NULL;
  64.  
  65. /** The Program control block */
  66. static pcb_t pcb;
  67.  
  68. /** Number of arguments */
  69. static int argc = 0;
  70. /** Argument vector */
  71. static char **argv = NULL;
  72. /** Buffer holding all arguments */
  73. static char *arg_buf = NULL;
  74.  
  75. static elf_info_t prog_info;
  76. static elf_info_t interp_info;
  77.  
  78. static bool is_dyn_linked;
  79.  
  80.  
  81. static void loader_get_taskid(ipc_callid_t rid, ipc_call_t *request)
  82. {
  83.     ipc_callid_t callid;
  84.     task_id_t task_id;
  85.     size_t len;
  86.  
  87.     task_id = task_get_id();
  88.  
  89.     if (!ipc_data_read_receive(&callid, &len)) {
  90.         ipc_answer_0(callid, EINVAL);
  91.         ipc_answer_0(rid, EINVAL);
  92.         return;
  93.     }
  94.  
  95.     if (len > sizeof(task_id)) len = sizeof(task_id);
  96.  
  97.     ipc_data_read_finalize(callid, &task_id, len);
  98.     ipc_answer_0(rid, EOK);
  99. }
  100.  
  101.  
  102. /** Receive a call setting pathname of the program to execute.
  103.  *
  104.  * @param rid
  105.  * @param request
  106.  */
  107. static void loader_set_pathname(ipc_callid_t rid, ipc_call_t *request)
  108. {
  109.     ipc_callid_t callid;
  110.     size_t len;
  111.     char *name_buf;
  112.  
  113.     if (!ipc_data_write_receive(&callid, &len)) {
  114.         ipc_answer_0(callid, EINVAL);
  115.         ipc_answer_0(rid, EINVAL);
  116.         return;
  117.     }
  118.  
  119.     name_buf = malloc(len + 1);
  120.     if (!name_buf) {
  121.         ipc_answer_0(callid, ENOMEM);
  122.         ipc_answer_0(rid, ENOMEM);
  123.         return;
  124.     }
  125.  
  126.     ipc_data_write_finalize(callid, name_buf, len);
  127.     ipc_answer_0(rid, EOK);
  128.  
  129.     if (pathname != NULL) {
  130.         free(pathname);
  131.         pathname = NULL;
  132.     }
  133.  
  134.     name_buf[len] = '\0';
  135.     pathname = name_buf;
  136. }
  137.  
  138. /** Receive a call setting arguments of the program to execute.
  139.  *
  140.  * @param rid
  141.  * @param request
  142.  */
  143. static void loader_set_args(ipc_callid_t rid, ipc_call_t *request)
  144. {
  145.     ipc_callid_t callid;
  146.     size_t buf_len, arg_len;
  147.     char *p;
  148.     int n;
  149.  
  150.     if (!ipc_data_write_receive(&callid, &buf_len)) {
  151.         ipc_answer_0(callid, EINVAL);
  152.         ipc_answer_0(rid, EINVAL);
  153.         return;
  154.     }
  155.  
  156.     if (arg_buf != NULL) {
  157.         free(arg_buf);
  158.         arg_buf = NULL;
  159.     }
  160.  
  161.     if (argv != NULL) {
  162.         free(argv);
  163.         argv = NULL;
  164.     }
  165.  
  166.     arg_buf = malloc(buf_len + 1);
  167.     if (!arg_buf) {
  168.         ipc_answer_0(callid, ENOMEM);
  169.         ipc_answer_0(rid, ENOMEM);
  170.         return;
  171.     }
  172.  
  173.     ipc_data_write_finalize(callid, arg_buf, buf_len);
  174.     ipc_answer_0(rid, EOK);
  175.  
  176.     arg_buf[buf_len] = '\0';
  177.  
  178.     /*
  179.      * Count number of arguments
  180.      */
  181.     p = arg_buf;
  182.     n = 0;
  183.     while (p < arg_buf + buf_len) {
  184.         arg_len = strlen(p);
  185.         p = p + arg_len + 1;
  186.         ++n;
  187.     }
  188.  
  189.     /* Allocate argv */
  190.     argv = malloc((n + 1) * sizeof(char *));
  191.  
  192.     if (argv == NULL) {
  193.         free(arg_buf);
  194.         ipc_answer_0(callid, ENOMEM);
  195.         ipc_answer_0(rid, ENOMEM);
  196.         return;
  197.     }
  198.  
  199.     /*
  200.      * Fill argv with argument pointers
  201.      */
  202.     p = arg_buf;
  203.     n = 0;
  204.     while (p < arg_buf + buf_len) {
  205.         argv[n] = p;
  206.  
  207.         arg_len = strlen(p);
  208.         p = p + arg_len + 1;
  209.         ++n;
  210.     }
  211.  
  212.     argc = n;
  213.     argv[n] = NULL;
  214. }
  215.  
  216. /** Load the previously selected program.
  217.  *
  218.  * @param rid
  219.  * @param request
  220.  * @return 0 on success, !0 on error.
  221.  */
  222. static int loader_load(ipc_callid_t rid, ipc_call_t *request)
  223. {
  224.     int rc;
  225.  
  226.     rc = elf_load_file(pathname, 0, &prog_info);
  227.     if (rc < 0) {
  228.         printf("Failed to load executable '%s'.\n", pathname);
  229.         ipc_answer_0(rid, EINVAL);
  230.         return 1;
  231.     }
  232.  
  233.     elf_create_pcb(&prog_info, &pcb);
  234.  
  235.     pcb.argc = argc;
  236.     pcb.argv = argv;
  237.  
  238.     if (prog_info.interp == NULL) {
  239.         /* Statically linked program */
  240.         is_dyn_linked = false;
  241.         ipc_answer_0(rid, EOK);
  242.         return 0;
  243.     }
  244.  
  245.     rc = elf_load_file(prog_info.interp, 0, &interp_info);
  246.     if (rc < 0) {
  247.         printf("Failed to load interpreter '%s.'\n", prog_info.interp);
  248.         ipc_answer_0(rid, EINVAL);
  249.         return 1;
  250.     }
  251.  
  252.     is_dyn_linked = true;
  253.     ipc_answer_0(rid, EOK);
  254.  
  255.     return 0;
  256. }
  257.  
  258.  
  259. /** Run the previously loaded program.
  260.  *
  261.  * @param rid
  262.  * @param request
  263.  * @return 0 on success, !0 on error.
  264.  */
  265. static void loader_run(ipc_callid_t rid, ipc_call_t *request)
  266. {
  267.     if (is_dyn_linked == true) {
  268.         /* Dynamically linked program */
  269.         printf("run dynamic linker\n");
  270.         printf("entry point: 0x%lx\n", interp_info.entry);
  271.         close_console();
  272.  
  273.         ipc_answer_0(rid, EOK);
  274.         elf_run(&interp_info, &pcb);
  275.  
  276.     } else {
  277.         /* Statically linked program */
  278.         close_console();
  279.         ipc_answer_0(rid, EOK);
  280.         elf_run(&prog_info, &pcb);
  281.     }
  282.  
  283.     /* Not reached */
  284. }
  285.  
  286. /** Handle loader connection.
  287.  *
  288.  * Receive and carry out commands (of which the last one should be
  289.  * to execute the loaded program).
  290.  */
  291. static void loader_connection(ipc_callid_t iid, ipc_call_t *icall)
  292. {
  293.     ipc_callid_t callid;
  294.     ipc_call_t call;
  295.     int retval;
  296.  
  297.     /* Ignore parameters, the connection is already open */
  298.     (void)iid; (void)icall;
  299.  
  300.     while (1) {
  301.         callid = async_get_call(&call);
  302.  
  303.         switch (IPC_GET_METHOD(call)) {
  304.         case IPC_M_PHONE_HUNGUP:
  305.             exit(0);
  306.         case LOADER_GET_TASKID:
  307.             loader_get_taskid(callid, &call);
  308.             continue;
  309.         case LOADER_SET_PATHNAME:
  310.             loader_set_pathname(callid, &call);
  311.             continue;
  312.         case LOADER_SET_ARGS:
  313.             loader_set_args(callid, &call);
  314.             continue;
  315.         case LOADER_LOAD:
  316.             loader_load(callid, &call);
  317.             continue;
  318.         case LOADER_RUN:
  319.             loader_run(callid, &call);
  320.             /* Not reached */
  321.         default:
  322.             retval = ENOENT;
  323.             break;
  324.         }
  325.         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
  326.             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
  327.             printf("responding EINVAL to method %d\n",
  328.                 IPC_GET_METHOD(call));
  329.             ipc_answer_0(callid, EINVAL);
  330.         }
  331.     }
  332. }
  333.  
  334. /** Program loader main function.
  335.  */
  336. int main(int argc, char *argv[])
  337. {
  338.     ipc_callid_t callid;
  339.     ipc_call_t call;
  340.     ipcarg_t phone_hash;
  341.  
  342.     /* The first call only communicates the incoming phone hash */
  343.     callid = ipc_wait_for_call(&call);
  344.  
  345.     if (IPC_GET_METHOD(call) != LOADER_HELLO) {
  346.         if (IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP)
  347.             ipc_answer_0(callid, EINVAL);
  348.         return 1;
  349.     }
  350.  
  351.     ipc_answer_0(callid, EOK);
  352.     phone_hash = call.in_phone_hash;
  353.  
  354.     /*
  355.      * Up until now async must not be used as it couldn't
  356.      * handle incoming requests. (Which means e.g. printf()
  357.      * cannot be used)
  358.      */
  359.     async_new_connection(phone_hash, 0, NULL, loader_connection);
  360.     async_manager();
  361.  
  362.     /* not reached */
  363.     return 0;
  364. }
  365.  
  366. /** @}
  367.  */
  368.