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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 <ipc/ns.h>
  56. #include <macros.h>
  57. #include <loader/pcb.h>
  58. #include <errno.h>
  59. #include <async.h>
  60. #include <string.h>
  61. #include <as.h>
  62.  
  63. #include <elf.h>
  64. #include <elf_load.h>
  65.  
  66. #define DPRINTF(...)
  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. /** Number of preset files */
  82. static int filc = 0;
  83. /** Preset files vector */
  84. static fdi_node_t **filv = NULL;
  85. /** Buffer holding all preset files */
  86. static fdi_node_t *fil_buf = NULL;
  87.  
  88. static elf_info_t prog_info;
  89. static elf_info_t interp_info;
  90.  
  91. static bool is_dyn_linked;
  92.  
  93. /** Used to limit number of connections to one. */
  94. static bool connected;
  95.  
  96. static void ldr_get_taskid(ipc_callid_t rid, ipc_call_t *request)
  97. {
  98.     ipc_callid_t callid;
  99.     task_id_t task_id;
  100.     size_t len;
  101.    
  102.     task_id = task_get_id();
  103.    
  104.     if (!ipc_data_read_receive(&callid, &len)) {
  105.         ipc_answer_0(callid, EINVAL);
  106.         ipc_answer_0(rid, EINVAL);
  107.         return;
  108.     }
  109.    
  110.     if (len > sizeof(task_id))
  111.         len = sizeof(task_id);
  112.    
  113.     ipc_data_read_finalize(callid, &task_id, len);
  114.     ipc_answer_0(rid, EOK);
  115. }
  116.  
  117.  
  118. /** Receive a call setting pathname of the program to execute.
  119.  *
  120.  * @param rid
  121.  * @param request
  122.  */
  123. static void ldr_set_pathname(ipc_callid_t rid, ipc_call_t *request)
  124. {
  125.     ipc_callid_t callid;
  126.     size_t len;
  127.     char *name_buf;
  128.    
  129.     if (!ipc_data_write_receive(&callid, &len)) {
  130.         ipc_answer_0(callid, EINVAL);
  131.         ipc_answer_0(rid, EINVAL);
  132.         return;
  133.     }
  134.    
  135.     name_buf = malloc(len + 1);
  136.     if (!name_buf) {
  137.         ipc_answer_0(callid, ENOMEM);
  138.         ipc_answer_0(rid, ENOMEM);
  139.         return;
  140.     }
  141.    
  142.     ipc_data_write_finalize(callid, name_buf, len);
  143.     ipc_answer_0(rid, EOK);
  144.    
  145.     if (pathname != NULL) {
  146.         free(pathname);
  147.         pathname = NULL;
  148.     }
  149.    
  150.     name_buf[len] = '\0';
  151.     pathname = name_buf;
  152. }
  153.  
  154. /** Receive a call setting arguments of the program to execute.
  155.  *
  156.  * @param rid
  157.  * @param request
  158.  */
  159. static void ldr_set_args(ipc_callid_t rid, ipc_call_t *request)
  160. {
  161.     ipc_callid_t callid;
  162.     size_t buf_size, arg_size;
  163.     char *p;
  164.     int n;
  165.    
  166.     if (!ipc_data_write_receive(&callid, &buf_size)) {
  167.         ipc_answer_0(callid, EINVAL);
  168.         ipc_answer_0(rid, EINVAL);
  169.         return;
  170.     }
  171.    
  172.     if (arg_buf != NULL) {
  173.         free(arg_buf);
  174.         arg_buf = NULL;
  175.     }
  176.    
  177.     if (argv != NULL) {
  178.         free(argv);
  179.         argv = NULL;
  180.     }
  181.    
  182.     arg_buf = malloc(buf_size + 1);
  183.     if (!arg_buf) {
  184.         ipc_answer_0(callid, ENOMEM);
  185.         ipc_answer_0(rid, ENOMEM);
  186.         return;
  187.     }
  188.    
  189.     ipc_data_write_finalize(callid, arg_buf, buf_size);
  190.    
  191.     arg_buf[buf_size] = '\0';
  192.    
  193.     /*
  194.      * Count number of arguments
  195.      */
  196.     p = arg_buf;
  197.     n = 0;
  198.     while (p < arg_buf + buf_size) {
  199.         arg_size = str_size(p);
  200.         p = p + arg_size + 1;
  201.         ++n;
  202.     }
  203.    
  204.     /* Allocate argv */
  205.     argv = malloc((n + 1) * sizeof(char *));
  206.    
  207.     if (argv == NULL) {
  208.         free(arg_buf);
  209.         ipc_answer_0(rid, ENOMEM);
  210.         return;
  211.     }
  212.  
  213.     /*
  214.      * Fill argv with argument pointers
  215.      */
  216.     p = arg_buf;
  217.     n = 0;
  218.     while (p < arg_buf + buf_size) {
  219.         argv[n] = p;
  220.        
  221.         arg_size = str_size(p);
  222.         p = p + arg_size + 1;
  223.         ++n;
  224.     }
  225.    
  226.     argc = n;
  227.     argv[n] = NULL;
  228.  
  229.     ipc_answer_0(rid, EOK);
  230. }
  231.  
  232. /** Receive a call setting preset files of the program to execute.
  233.  *
  234.  * @param rid
  235.  * @param request
  236.  */
  237. static void ldr_set_files(ipc_callid_t rid, ipc_call_t *request)
  238. {
  239.     ipc_callid_t callid;
  240.     size_t buf_size;
  241.     if (!ipc_data_write_receive(&callid, &buf_size)) {
  242.         ipc_answer_0(callid, EINVAL);
  243.         ipc_answer_0(rid, EINVAL);
  244.         return;
  245.     }
  246.    
  247.     if ((buf_size % sizeof(fdi_node_t)) != 0) {
  248.         ipc_answer_0(callid, EINVAL);
  249.         ipc_answer_0(rid, EINVAL);
  250.         return;
  251.     }
  252.    
  253.     if (fil_buf != NULL) {
  254.         free(fil_buf);
  255.         fil_buf = NULL;
  256.     }
  257.    
  258.     if (filv != NULL) {
  259.         free(filv);
  260.         filv = NULL;
  261.     }
  262.    
  263.     fil_buf = malloc(buf_size);
  264.     if (!fil_buf) {
  265.         ipc_answer_0(callid, ENOMEM);
  266.         ipc_answer_0(rid, ENOMEM);
  267.         return;
  268.     }
  269.    
  270.     ipc_data_write_finalize(callid, fil_buf, buf_size);
  271.    
  272.     int count = buf_size / sizeof(fdi_node_t);
  273.    
  274.     /* Allocate filvv */
  275.     filv = malloc((count + 1) * sizeof(fdi_node_t *));
  276.    
  277.     if (filv == NULL) {
  278.         free(fil_buf);
  279.         ipc_answer_0(rid, ENOMEM);
  280.         return;
  281.     }
  282.    
  283.     /*
  284.      * Fill filv with argument pointers
  285.      */
  286.     int i;
  287.     for (i = 0; i < count; i++)
  288.         filv[i] = &fil_buf[i];
  289.    
  290.     filc = count;
  291.     filv[count] = NULL;
  292.    
  293.     ipc_answer_0(rid, EOK);
  294. }
  295.  
  296. /** Load the previously selected program.
  297.  *
  298.  * @param rid
  299.  * @param request
  300.  * @return 0 on success, !0 on error.
  301.  */
  302. static int ldr_load(ipc_callid_t rid, ipc_call_t *request)
  303. {
  304.     int rc;
  305.    
  306.     rc = elf_load_file(pathname, 0, &prog_info);
  307.     if (rc != EE_OK) {
  308.         DPRINTF("Failed to load executable '%s'.\n", pathname);
  309.         ipc_answer_0(rid, EINVAL);
  310.         return 1;
  311.     }
  312.    
  313.     elf_create_pcb(&prog_info, &pcb);
  314.    
  315.     pcb.argc = argc;
  316.     pcb.argv = argv;
  317.    
  318.     pcb.filc = filc;
  319.     pcb.filv = filv;
  320.    
  321.     if (prog_info.interp == NULL) {
  322.         /* Statically linked program */
  323.         is_dyn_linked = false;
  324.         ipc_answer_0(rid, EOK);
  325.         return 0;
  326.     }
  327.    
  328.     rc = elf_load_file(prog_info.interp, 0, &interp_info);
  329.     if (rc != EE_OK) {
  330.         DPRINTF("Failed to load interpreter '%s.'\n",
  331.             prog_info.interp);
  332.         ipc_answer_0(rid, EINVAL);
  333.         return 1;
  334.     }
  335.    
  336.     is_dyn_linked = true;
  337.     ipc_answer_0(rid, EOK);
  338.    
  339.     return 0;
  340. }
  341.  
  342.  
  343. /** Run the previously loaded program.
  344.  *
  345.  * @param rid
  346.  * @param request
  347.  * @return 0 on success, !0 on error.
  348.  */
  349. static void ldr_run(ipc_callid_t rid, ipc_call_t *request)
  350. {
  351.     const char *cp;
  352.    
  353.     /* Set the task name. */
  354.     cp = str_rchr(pathname, '/');
  355.     cp = (cp == NULL) ? pathname : (cp + 1);
  356.     task_set_name(cp);
  357.    
  358.     if (is_dyn_linked == true) {
  359.         /* Dynamically linked program */
  360.         DPRINTF("Run ELF interpreter.\n");
  361.         DPRINTF("Entry point: 0x%lx\n", interp_info.entry);
  362.        
  363.         ipc_answer_0(rid, EOK);
  364.         elf_run(&interp_info, &pcb);
  365.     } else {
  366.         /* Statically linked program */
  367.         ipc_answer_0(rid, EOK);
  368.         elf_run(&prog_info, &pcb);
  369.     }
  370.    
  371.     /* Not reached */
  372. }
  373.  
  374. /** Handle loader connection.
  375.  *
  376.  * Receive and carry out commands (of which the last one should be
  377.  * to execute the loaded program).
  378.  */
  379. static void ldr_connection(ipc_callid_t iid, ipc_call_t *icall)
  380. {
  381.     ipc_callid_t callid;
  382.     ipc_call_t call;
  383.     int retval;
  384.    
  385.     /* Already have a connection? */
  386.     if (connected) {
  387.         ipc_answer_0(iid, ELIMIT);
  388.         return;
  389.     }
  390.    
  391.     connected = true;
  392.    
  393.     /* Accept the connection */
  394.     ipc_answer_0(iid, EOK);
  395.    
  396.     /* Ignore parameters, the connection is already open */
  397.     (void) iid;
  398.     (void) icall;
  399.    
  400.     while (1) {
  401.         callid = async_get_call(&call);
  402.        
  403.         switch (IPC_GET_METHOD(call)) {
  404.         case IPC_M_PHONE_HUNGUP:
  405.             exit(0);
  406.         case LOADER_GET_TASKID:
  407.             ldr_get_taskid(callid, &call);
  408.             continue;
  409.         case LOADER_SET_PATHNAME:
  410.             ldr_set_pathname(callid, &call);
  411.             continue;
  412.         case LOADER_SET_ARGS:
  413.             ldr_set_args(callid, &call);
  414.             continue;
  415.         case LOADER_SET_FILES:
  416.             ldr_set_files(callid, &call);
  417.             continue;
  418.         case LOADER_LOAD:
  419.             ldr_load(callid, &call);
  420.             continue;
  421.         case LOADER_RUN:
  422.             ldr_run(callid, &call);
  423.             /* Not reached */
  424.         default:
  425.             retval = ENOENT;
  426.             break;
  427.         }
  428.         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
  429.             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
  430.             DPRINTF("Responding EINVAL to method %d.\n",
  431.                 IPC_GET_METHOD(call));
  432.             ipc_answer_0(callid, EINVAL);
  433.         }
  434.     }
  435. }
  436.  
  437. /** Program loader main function.
  438.  */
  439. int main(int argc, char *argv[])
  440. {
  441.     ipcarg_t phonead;
  442.     task_id_t id;
  443.     int rc;
  444.  
  445.     connected = false;
  446.  
  447.     /* Introduce this task to the NS (give it our task ID). */
  448.     id = task_get_id();
  449.     rc = async_req_2_0(PHONE_NS, NS_ID_INTRO, LOWER32(id), UPPER32(id));
  450.     if (rc != EOK)
  451.         return -1;
  452.  
  453.     /* Set a handler of incomming connections. */
  454.     async_set_client_connection(ldr_connection);
  455.    
  456.     /* Register at naming service. */
  457.     if (ipc_connect_to_me(PHONE_NS, SERVICE_LOAD, 0, 0, &phonead) != 0)
  458.         return -2;
  459.  
  460.     async_manager();
  461.    
  462.     /* Never reached */
  463.     return 0;
  464. }
  465.  
  466. /** @}
  467.  */
  468.