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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 <fcntl.h>
  50. #include <sys/types.h>
  51. #include <ipc/ipc.h>
  52. #include <ipc/loader.h>
  53. #include <loader/pcb.h>
  54. #include <errno.h>
  55. #include <async.h>
  56. #include <as.h>
  57.  
  58. #include <elf.h>
  59. #include <elf_load.h>
  60.  
  61. /**
  62.  * Bias used for loading the dynamic linker. This will be soon replaced
  63.  * by automatic placement.
  64.  */
  65. #define RTLD_BIAS 0x80000
  66.  
  67. /** Pathname of the file that will be loaded */
  68. static char *pathname = NULL;
  69.  
  70. /** The Program control block */
  71. static pcb_t pcb;
  72.  
  73. /** Number of arguments */
  74. static int argc = 0;
  75. /** Argument vector */
  76. static char **argv = NULL;
  77. /** Buffer holding all arguments */
  78. static char *arg_buf = NULL;
  79.  
  80. static int loader_get_taskid(ipc_callid_t rid, ipc_call_t *request)
  81. {
  82.     ipc_callid_t callid;
  83.     task_id_t task_id;
  84.     size_t len;
  85.  
  86.     task_id = task_get_id();
  87.  
  88.     if (!ipc_data_read_receive(&callid, &len)) {
  89.         ipc_answer_0(callid, EINVAL);
  90.         ipc_answer_0(rid, EINVAL);
  91.         return;
  92.     }
  93.  
  94.     if (len > sizeof(task_id)) len = sizeof(task_id);
  95.  
  96.     ipc_data_write_finalize(callid, &task_id, len);
  97.     ipc_answer_0(rid, EOK);
  98. }
  99.  
  100.  
  101. /** Receive a call setting pathname of the program to execute.
  102.  *
  103.  * @param rid
  104.  * @param request
  105.  */
  106. static void loader_set_pathname(ipc_callid_t rid, ipc_call_t *request)
  107. {
  108.     ipc_callid_t callid;
  109.     size_t len;
  110.     char *name_buf;
  111.  
  112.     if (!ipc_data_write_receive(&callid, &len)) {
  113.         ipc_answer_0(callid, EINVAL);
  114.         ipc_answer_0(rid, EINVAL);
  115.         return;
  116.     }
  117.  
  118.     name_buf = malloc(len + 1);
  119.     if (!name_buf) {
  120.         ipc_answer_0(callid, ENOMEM);
  121.         ipc_answer_0(rid, ENOMEM);
  122.         return;
  123.     }
  124.  
  125.     ipc_data_write_finalize(callid, name_buf, len);
  126.     ipc_answer_0(rid, EOK);
  127.  
  128.     if (pathname != NULL) {
  129.         free(pathname);
  130.         pathname = NULL;
  131.     }
  132.  
  133.     name_buf[len] = '\0';
  134.     pathname = name_buf;
  135. }
  136.  
  137. /** Receive a call setting arguments of the program to execute.
  138.  *
  139.  * @param rid
  140.  * @param request
  141.  */
  142. static void loader_set_args(ipc_callid_t rid, ipc_call_t *request)
  143. {
  144.     ipc_callid_t callid;
  145.     size_t buf_len, arg_len;
  146.     char *p;
  147.     int n;
  148.  
  149.     if (!ipc_data_write_receive(&callid, &buf_len)) {
  150.         ipc_answer_0(callid, EINVAL);
  151.         ipc_answer_0(rid, EINVAL);
  152.         return;
  153.     }
  154.  
  155.     if (arg_buf != NULL) {
  156.         free(arg_buf);
  157.         arg_buf = NULL;
  158.     }
  159.  
  160.     if (argv != NULL) {
  161.         free(argv);
  162.         argv = NULL;
  163.     }
  164.  
  165.     arg_buf = malloc(buf_len + 1);
  166.     if (!arg_buf) {
  167.         ipc_answer_0(callid, ENOMEM);
  168.         ipc_answer_0(rid, ENOMEM);
  169.         return;
  170.     }
  171.  
  172.     ipc_data_write_finalize(callid, arg_buf, buf_len);
  173.     ipc_answer_0(rid, EOK);
  174.  
  175.     arg_buf[buf_len] = '\0';
  176.  
  177.     /*
  178.      * Count number of arguments
  179.      */
  180.     p = arg_buf;
  181.     n = 0;
  182.     while (p < arg_buf + buf_len) {
  183.         arg_len = strlen(p);
  184.         p = p + arg_len + 1;
  185.         ++n;
  186.     }
  187.  
  188.     /* Allocate argv */
  189.     argv = malloc((n + 1) * sizeof(char *));
  190.  
  191.     if (argv == NULL) {
  192.         free(arg_buf);
  193.         ipc_answer_0(callid, ENOMEM);
  194.         ipc_answer_0(rid, ENOMEM);
  195.         return;
  196.     }
  197.  
  198.     /*
  199.      * Fill argv with argument pointers
  200.      */
  201.     p = arg_buf;
  202.     n = 0;
  203.     while (p < arg_buf + buf_len) {
  204.         argv[n] = p;
  205.  
  206.         arg_len = strlen(p);
  207.         p = p + arg_len + 1;
  208.         ++n;
  209.     }
  210.  
  211.     argc = n;
  212.     argv[n] = NULL;
  213. }
  214.  
  215.  
  216. /** Load and run the previously selected program.
  217.  *
  218.  * @param rid
  219.  * @param request
  220.  * @return 0 on success, !0 on error.
  221.  */
  222. static int loader_run(ipc_callid_t rid, ipc_call_t *request)
  223. {
  224.     int rc;
  225.  
  226.     elf_info_t prog_info;
  227.     elf_info_t interp_info;
  228.  
  229. //  printf("Load program '%s'\n", pathname);
  230.  
  231.     rc = elf_load_file(pathname, 0, &prog_info);
  232.     if (rc < 0) {
  233.         printf("failed to load program\n");
  234.         ipc_answer_0(rid, EINVAL);
  235.         return 1;
  236.     }
  237.  
  238. //  printf("Create PCB\n");
  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. //      printf("Run statically linked program\n");
  247. //      printf("entry point: 0x%llx\n", prog_info.entry);
  248.         ipc_answer_0(rid, EOK);
  249.         close_console();
  250.         elf_run(&prog_info, &pcb);
  251.         return 0;
  252.     }
  253.  
  254.     printf("Load dynamic linker '%s'\n", prog_info.interp);
  255.     rc = elf_load_file(prog_info.interp, RTLD_BIAS, &interp_info);
  256.     if (rc < 0) {
  257.         printf("failed to load dynamic linker\n");
  258.         ipc_answer_0(rid, EINVAL);
  259.         return 1;
  260.     }
  261.  
  262.     /*
  263.      * Provide dynamic linker with some useful data
  264.      */
  265.     pcb.rtld_dynamic = interp_info.dynamic;
  266.     pcb.rtld_bias = RTLD_BIAS;
  267.  
  268.     printf("run dynamic linker\n");
  269.     printf("rtld_dynamic = 0x%lx\n", pcb.rtld_dynamic);
  270.     printf("entry point: 0x%lx\n", interp_info.entry);
  271.     printf("pcb address: 0x%lx\n", &pcb);
  272.     close_console();
  273.  
  274.     ipc_answer_0(rid, EOK);
  275.     elf_run(&interp_info, &pcb);
  276.  
  277.     /* Not reached */
  278.     return 0;
  279. }
  280.  
  281. /** Handle loader connection.
  282.  *
  283.  * Receive and carry out commands (of which the last one should be
  284.  * to execute the loaded program).
  285.  */
  286. static void loader_connection(ipc_callid_t iid, ipc_call_t *icall)
  287. {
  288.     ipc_callid_t callid;
  289.     ipc_call_t call;
  290.     int retval;
  291.  
  292.     /* Ignore parameters, the connection is already open */
  293.     (void)iid; (void)icall;
  294.  
  295.     while (1) {
  296.         callid = async_get_call(&call);
  297. //      printf("received call from phone %d, method=%d\n",
  298. //          call.in_phone_hash, IPC_GET_METHOD(call));
  299.         switch (IPC_GET_METHOD(call)) {
  300.         case LOADER_GET_TASKID:
  301.             loader_get_taskid(callid, &call);
  302.             continue;
  303.         case LOADER_SET_PATHNAME:
  304.             loader_set_pathname(callid, &call);
  305.             continue;
  306.         case LOADER_SET_ARGS:
  307.             loader_set_args(callid, &call);
  308.         case LOADER_RUN:
  309.             loader_run(callid, &call);
  310.             exit(0);
  311.             continue;
  312.         default:
  313.             retval = ENOENT;
  314.             break;
  315.         }
  316.         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
  317.             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
  318.             printf("responding EINVAL to method %d\n",
  319.                 IPC_GET_METHOD(call));
  320.             ipc_answer_0(callid, EINVAL);
  321.         }
  322.     }
  323. }
  324.  
  325. /** Program loader main function.
  326.  */
  327. int main(int argc, char *argv[])
  328. {
  329.     ipc_callid_t callid;
  330.     ipc_call_t call;
  331.     ipcarg_t phone_hash;
  332.  
  333.     /* The first call only communicates the incoming phone hash */
  334.     callid = ipc_wait_for_call(&call);
  335.  
  336.     if (IPC_GET_METHOD(call) != LOADER_HELLO) {
  337.         if (IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP)
  338.             ipc_answer_0(callid, EINVAL);
  339.         return 1;
  340.     }
  341.  
  342.     ipc_answer_0(callid, EOK);
  343.     phone_hash = call.in_phone_hash;
  344.  
  345.     /*
  346.      * Up until now async must not be used as it couldn't
  347.      * handle incoming requests. (Which means e.g. printf()
  348.      * cannot be used)
  349.      */
  350.     async_new_connection(phone_hash, 0, NULL, loader_connection);
  351.     async_manager();
  352.  
  353.     /* not reached */
  354.     return 0;
  355. }
  356.  
  357. /** @}
  358.  */
  359.