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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. void program_run(void *entry, pcb_t *pcb);
  63.  
  64. /** Pathname of the file that will be loaded */
  65. static char *pathname = NULL;
  66.  
  67. /** The Program control block */
  68. static pcb_t pcb;
  69.  
  70. /** Number of arguments */
  71. static int argc = 0;
  72. /** Argument vector */
  73. static char **argv = NULL;
  74. /** Buffer holding all arguments */
  75. static char *arg_buf = NULL;
  76.  
  77. static elf_info_t prog_info;
  78. static elf_info_t interp_info;
  79.  
  80. static bool is_dyn_linked;
  81.  
  82.  
  83. static void loader_get_taskid(ipc_callid_t rid, ipc_call_t *request)
  84. {
  85.     ipc_callid_t callid;
  86.     task_id_t task_id;
  87.     size_t len;
  88.  
  89.     task_id = task_get_id();
  90.  
  91.     if (!ipc_data_read_receive(&callid, &len)) {
  92.         ipc_answer_0(callid, EINVAL);
  93.         ipc_answer_0(rid, EINVAL);
  94.         return;
  95.     }
  96.  
  97.     if (len > sizeof(task_id)) len = sizeof(task_id);
  98.  
  99.     ipc_data_read_finalize(callid, &task_id, len);
  100.     ipc_answer_0(rid, EOK);
  101. }
  102.  
  103.  
  104. /** Receive a call setting pathname of the program to execute.
  105.  *
  106.  * @param rid
  107.  * @param request
  108.  */
  109. static void loader_set_pathname(ipc_callid_t rid, ipc_call_t *request)
  110. {
  111.     ipc_callid_t callid;
  112.     size_t len;
  113.     char *name_buf;
  114.  
  115.     if (!ipc_data_write_receive(&callid, &len)) {
  116.         ipc_answer_0(callid, EINVAL);
  117.         ipc_answer_0(rid, EINVAL);
  118.         return;
  119.     }
  120.  
  121.     name_buf = malloc(len + 1);
  122.     if (!name_buf) {
  123.         ipc_answer_0(callid, ENOMEM);
  124.         ipc_answer_0(rid, ENOMEM);
  125.         return;
  126.     }
  127.  
  128.     ipc_data_write_finalize(callid, name_buf, len);
  129.     ipc_answer_0(rid, EOK);
  130.  
  131.     if (pathname != NULL) {
  132.         free(pathname);
  133.         pathname = NULL;
  134.     }
  135.  
  136.     name_buf[len] = '\0';
  137.     pathname = name_buf;
  138. }
  139.  
  140. /** Receive a call setting arguments of the program to execute.
  141.  *
  142.  * @param rid
  143.  * @param request
  144.  */
  145. static void loader_set_args(ipc_callid_t rid, ipc_call_t *request)
  146. {
  147.     ipc_callid_t callid;
  148.     size_t buf_len, arg_len;
  149.     char *p;
  150.     int n;
  151.  
  152.     if (!ipc_data_write_receive(&callid, &buf_len)) {
  153.         ipc_answer_0(callid, EINVAL);
  154.         ipc_answer_0(rid, EINVAL);
  155.         return;
  156.     }
  157.  
  158.     if (arg_buf != NULL) {
  159.         free(arg_buf);
  160.         arg_buf = NULL;
  161.     }
  162.  
  163.     if (argv != NULL) {
  164.         free(argv);
  165.         argv = NULL;
  166.     }
  167.  
  168.     arg_buf = malloc(buf_len + 1);
  169.     if (!arg_buf) {
  170.         ipc_answer_0(callid, ENOMEM);
  171.         ipc_answer_0(rid, ENOMEM);
  172.         return;
  173.     }
  174.  
  175.     ipc_data_write_finalize(callid, arg_buf, buf_len);
  176.     ipc_answer_0(rid, EOK);
  177.  
  178.     arg_buf[buf_len] = '\0';
  179.  
  180.     /*
  181.      * Count number of arguments
  182.      */
  183.     p = arg_buf;
  184.     n = 0;
  185.     while (p < arg_buf + buf_len) {
  186.         arg_len = strlen(p);
  187.         p = p + arg_len + 1;
  188.         ++n;
  189.     }
  190.  
  191.     /* Allocate argv */
  192.     argv = malloc((n + 1) * sizeof(char *));
  193.  
  194.     if (argv == NULL) {
  195.         free(arg_buf);
  196.         ipc_answer_0(callid, ENOMEM);
  197.         ipc_answer_0(rid, ENOMEM);
  198.         return;
  199.     }
  200.  
  201.     /*
  202.      * Fill argv with argument pointers
  203.      */
  204.     p = arg_buf;
  205.     n = 0;
  206.     while (p < arg_buf + buf_len) {
  207.         argv[n] = p;
  208.  
  209.         arg_len = strlen(p);
  210.         p = p + arg_len + 1;
  211.         ++n;
  212.     }
  213.  
  214.     argc = n;
  215.     argv[n] = NULL;
  216. }
  217.  
  218. /** Load the previously selected program.
  219.  *
  220.  * @param rid
  221.  * @param request
  222.  * @return 0 on success, !0 on error.
  223.  */
  224. static int loader_load(ipc_callid_t rid, ipc_call_t *request)
  225. {
  226.     int rc;
  227.  
  228.     rc = elf_load_file(pathname, 0, 0, &prog_info);
  229.     if (rc < 0) {
  230.         printf("Failed to load executable '%s'.\n", pathname);
  231.         ipc_answer_0(rid, EINVAL);
  232.         return 1;
  233.     }
  234.  
  235.     elf_create_pcb(&prog_info, &pcb);
  236.  
  237.     pcb.argc = argc;
  238.     pcb.argv = argv;
  239.  
  240.     if (prog_info.interp == NULL) {
  241.         /* Statically linked program */
  242.         is_dyn_linked = false;
  243.         ipc_answer_0(rid, EOK);
  244.         return 0;
  245.     }
  246.  
  247.     printf("Load ELF interpreter '%s'\n", prog_info.interp);
  248.     rc = elf_load_file(prog_info.interp, 0, 0, &interp_info);
  249.     if (rc < 0) {
  250.         printf("Failed to load interpreter '%s.'\n", prog_info.interp);
  251.         ipc_answer_0(rid, EINVAL);
  252.         return 1;
  253.     }
  254.  
  255.     printf("Run interpreter.\n");
  256.     printf("entry point: 0x%lx\n", interp_info.entry);
  257.     printf("pcb address: 0x%lx\n", &pcb);
  258.     printf("prog dynamic: 0x%lx\n", prog_info.dynamic);
  259.  
  260.     is_dyn_linked = true;
  261.     ipc_answer_0(rid, EOK);
  262.  
  263.     return 0;
  264. }
  265.  
  266.  
  267. /** Run the previously loaded program.
  268.  *
  269.  * @param rid
  270.  * @param request
  271.  * @return 0 on success, !0 on error.
  272.  */
  273. static void loader_run(ipc_callid_t rid, ipc_call_t *request)
  274. {
  275.     if (is_dyn_linked == true) {
  276.         /* Dynamically linked program */
  277.         printf("run dynamic linker\n");
  278.         printf("entry point: 0x%lx\n", interp_info.entry);
  279.         close_console();
  280.  
  281.         ipc_answer_0(rid, EOK);
  282.         program_run(interp_info.entry, &pcb);
  283.  
  284.     } else {
  285.         /* Statically linked program */
  286.         close_console();
  287.         ipc_answer_0(rid, EOK);
  288.         program_run(prog_info.entry, &pcb);
  289.     }
  290.  
  291.     /* Not reached */
  292. }
  293.  
  294. /** Handle loader connection.
  295.  *
  296.  * Receive and carry out commands (of which the last one should be
  297.  * to execute the loaded program).
  298.  */
  299. static void loader_connection(ipc_callid_t iid, ipc_call_t *icall)
  300. {
  301.     ipc_callid_t callid;
  302.     ipc_call_t call;
  303.     int retval;
  304.  
  305.     /* Ignore parameters, the connection is already open */
  306.     (void)iid; (void)icall;
  307.  
  308.     while (1) {
  309.         callid = async_get_call(&call);
  310.  
  311.         switch (IPC_GET_METHOD(call)) {
  312.         case IPC_M_PHONE_HUNGUP:
  313.             exit(0);
  314.         case LOADER_GET_TASKID:
  315.             loader_get_taskid(callid, &call);
  316.             continue;
  317.         case LOADER_SET_PATHNAME:
  318.             loader_set_pathname(callid, &call);
  319.             continue;
  320.         case LOADER_SET_ARGS:
  321.             loader_set_args(callid, &call);
  322.             continue;
  323.         case LOADER_LOAD:
  324.             loader_load(callid, &call);
  325.             continue;
  326.         case LOADER_RUN:
  327.             loader_run(callid, &call);
  328.             /* Not reached */
  329.         default:
  330.             retval = ENOENT;
  331.             break;
  332.         }
  333.         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
  334.             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
  335.             printf("responding EINVAL to method %d\n",
  336.                 IPC_GET_METHOD(call));
  337.             ipc_answer_0(callid, EINVAL);
  338.         }
  339.     }
  340. }
  341.  
  342. /** Program loader main function.
  343.  */
  344. int main(int argc, char *argv[])
  345. {
  346.     ipc_callid_t callid;
  347.     ipc_call_t call;
  348.     ipcarg_t phone_hash;
  349.  
  350.     /* The first call only communicates the incoming phone hash */
  351.     callid = ipc_wait_for_call(&call);
  352.  
  353.     if (IPC_GET_METHOD(call) != LOADER_HELLO) {
  354.         if (IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP)
  355.             ipc_answer_0(callid, EINVAL);
  356.         return 1;
  357.     }
  358.  
  359.     ipc_answer_0(callid, EOK);
  360.     phone_hash = call.in_phone_hash;
  361.  
  362.     /*
  363.      * Up until now async must not be used as it couldn't
  364.      * handle incoming requests. (Which means e.g. printf()
  365.      * cannot be used)
  366.      */
  367.     async_new_connection(phone_hash, 0, NULL, loader_connection);
  368.     async_manager();
  369.  
  370.     /* not reached */
  371.     return 0;
  372. }
  373.  
  374. /** @}
  375.  */
  376.