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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. /**
  63.  * Bias used for loading the dynamic linker. This will be soon replaced
  64.  * by automatic placement.
  65.  */
  66. #define RTLD_BIAS 0x80000
  67.  
  68. /** Pathname of the file that will be loaded */
  69. static char *pathname = NULL;
  70.  
  71. /** The Program control block */
  72. static pcb_t pcb;
  73.  
  74. /** Number of arguments */
  75. static int argc = 0;
  76. /** Argument vector */
  77. static char **argv = NULL;
  78. /** Buffer holding all arguments */
  79. static char *arg_buf = NULL;
  80.  
  81. static elf_info_t prog_info;
  82. static elf_info_t interp_info;
  83.  
  84. static bool is_dyn_linked;
  85.  
  86.  
  87. static void loader_get_taskid(ipc_callid_t rid, ipc_call_t *request)
  88. {
  89.     ipc_callid_t callid;
  90.     task_id_t task_id;
  91.     size_t len;
  92.  
  93.     task_id = task_get_id();
  94.  
  95.     if (!ipc_data_read_receive(&callid, &len)) {
  96.         ipc_answer_0(callid, EINVAL);
  97.         ipc_answer_0(rid, EINVAL);
  98.         return;
  99.     }
  100.  
  101.     if (len > sizeof(task_id)) 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. //  printf("Load program '%s'\n", pathname);
  233.  
  234.     rc = elf_load_file(pathname, 0, &prog_info);
  235.     if (rc < 0) {
  236.         printf("failed to load program\n");
  237.         ipc_answer_0(rid, EINVAL);
  238.         return 1;
  239.     }
  240.  
  241. //  printf("Create PCB\n");
  242.     elf_create_pcb(&prog_info, &pcb);
  243.  
  244.     pcb.argc = argc;
  245.     pcb.argv = argv;
  246.  
  247.     if (prog_info.interp == NULL) {
  248.         /* Statically linked program */
  249. //      printf("Run statically linked program\n");
  250. //      printf("entry point: 0x%lx\n", prog_info.entry);
  251.         is_dyn_linked = false;
  252.         ipc_answer_0(rid, EOK);
  253.         return 0;
  254.     }
  255.  
  256.     printf("Load dynamic linker '%s'\n", prog_info.interp);
  257.     rc = elf_load_file("/rtld.so", RTLD_BIAS, &interp_info);
  258.     if (rc < 0) {
  259.         printf("failed to load dynamic linker\n");
  260.         ipc_answer_0(rid, EINVAL);
  261.         return 1;
  262.     }
  263.  
  264.     /*
  265.      * Provide dynamic linker with some useful data
  266.      */
  267.     pcb.rtld_dynamic = interp_info.dynamic;
  268.     pcb.rtld_bias = RTLD_BIAS;
  269.  
  270.     is_dyn_linked = true;
  271.     ipc_answer_0(rid, EOK);
  272.  
  273.     return 0;
  274. }
  275.  
  276.  
  277. /** Run the previously loaded program.
  278.  *
  279.  * @param rid
  280.  * @param request
  281.  * @return 0 on success, !0 on error.
  282.  */
  283. static void loader_run(ipc_callid_t rid, ipc_call_t *request)
  284. {
  285.     if (is_dyn_linked == true) {
  286.         /* Dynamically linked program */
  287.         printf("run dynamic linker\n");
  288.         printf("entry point: 0x%lx\n", interp_info.entry);
  289.         close_console();
  290.  
  291.         ipc_answer_0(rid, EOK);
  292.         elf_run(&interp_info, &pcb);
  293.  
  294.     } else {
  295.         /* Statically linked program */
  296.         close_console();
  297.         ipc_answer_0(rid, EOK);
  298.         elf_run(&prog_info, &pcb);
  299.     }
  300.  
  301.     /* Not reached */
  302. }
  303.  
  304. /** Handle loader connection.
  305.  *
  306.  * Receive and carry out commands (of which the last one should be
  307.  * to execute the loaded program).
  308.  */
  309. static void loader_connection(ipc_callid_t iid, ipc_call_t *icall)
  310. {
  311.     ipc_callid_t callid;
  312.     ipc_call_t call;
  313.     int retval;
  314.  
  315.     /* Ignore parameters, the connection is already open */
  316.     (void)iid; (void)icall;
  317.  
  318.     while (1) {
  319.         callid = async_get_call(&call);
  320.  
  321.         switch (IPC_GET_METHOD(call)) {
  322.         case IPC_M_PHONE_HUNGUP:
  323.             exit(0);
  324.         case LOADER_GET_TASKID:
  325.             loader_get_taskid(callid, &call);
  326.             continue;
  327.         case LOADER_SET_PATHNAME:
  328.             loader_set_pathname(callid, &call);
  329.             continue;
  330.         case LOADER_SET_ARGS:
  331.             loader_set_args(callid, &call);
  332.             continue;
  333.         case LOADER_LOAD:
  334.             loader_load(callid, &call);
  335.             continue;
  336.         case LOADER_RUN:
  337.             loader_run(callid, &call);
  338.             /* Not reached */
  339.         default:
  340.             retval = ENOENT;
  341.             break;
  342.         }
  343.         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
  344.             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
  345.             printf("responding EINVAL to method %d\n",
  346.                 IPC_GET_METHOD(call));
  347.             ipc_answer_0(callid, EINVAL);
  348.         }
  349.     }
  350. }
  351.  
  352. /** Program loader main function.
  353.  */
  354. int main(int argc, char *argv[])
  355. {
  356.     ipc_callid_t callid;
  357.     ipc_call_t call;
  358.     ipcarg_t phone_hash;
  359.  
  360.     /* The first call only communicates the incoming phone hash */
  361.     callid = ipc_wait_for_call(&call);
  362.  
  363.     if (IPC_GET_METHOD(call) != LOADER_HELLO) {
  364.         if (IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP)
  365.             ipc_answer_0(callid, EINVAL);
  366.         return 1;
  367.     }
  368.  
  369.     ipc_answer_0(callid, EOK);
  370.     phone_hash = call.in_phone_hash;
  371.  
  372.     /*
  373.      * Up until now async must not be used as it couldn't
  374.      * handle incoming requests. (Which means e.g. printf()
  375.      * cannot be used)
  376.      */
  377.     async_new_connection(phone_hash, 0, NULL, loader_connection);
  378.     async_manager();
  379.  
  380.     /* not reached */
  381.     return 0;
  382. }
  383.  
  384. /** @}
  385.  */
  386.