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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 <loader/pcb.h>
  56. #include <errno.h>
  57. #include <async.h>
  58. #include <string.h>
  59. #include <as.h>
  60.  
  61. #include <elf.h>
  62. #include <elf_load.h>
  63.  
  64. #define DPRINTF(...)
  65.  
  66. /** Pathname of the file that will be loaded */
  67. static char *pathname = NULL;
  68.  
  69. /** The Program control block */
  70. static pcb_t pcb;
  71.  
  72. /** Number of arguments */
  73. static int argc = 0;
  74. /** Argument vector */
  75. static char **argv = NULL;
  76. /** Buffer holding all arguments */
  77. static char *arg_buf = NULL;
  78.  
  79. /** Number of preset files */
  80. static int filc = 0;
  81. /** Preset files vector */
  82. static fdi_node_t **filv = NULL;
  83. /** Buffer holding all preset files */
  84. static fdi_node_t *fil_buf = NULL;
  85.  
  86. static elf_info_t prog_info;
  87. static elf_info_t interp_info;
  88.  
  89. static bool is_dyn_linked;
  90.  
  91. /** Used to limit number of connections to one. */
  92. static bool connected;
  93.  
  94. static void ldr_get_taskid(ipc_callid_t rid, ipc_call_t *request)
  95. {
  96.     ipc_callid_t callid;
  97.     task_id_t task_id;
  98.     size_t len;
  99.    
  100.     task_id = task_get_id();
  101.    
  102.     if (!ipc_data_read_receive(&callid, &len)) {
  103.         ipc_answer_0(callid, EINVAL);
  104.         ipc_answer_0(rid, EINVAL);
  105.         return;
  106.     }
  107.    
  108.     if (len > sizeof(task_id))
  109.         len = sizeof(task_id);
  110.    
  111.     ipc_data_read_finalize(callid, &task_id, len);
  112.     ipc_answer_0(rid, EOK);
  113. }
  114.  
  115.  
  116. /** Receive a call setting pathname of the program to execute.
  117.  *
  118.  * @param rid
  119.  * @param request
  120.  */
  121. static void ldr_set_pathname(ipc_callid_t rid, ipc_call_t *request)
  122. {
  123.     ipc_callid_t callid;
  124.     size_t len;
  125.     char *name_buf;
  126.    
  127.     if (!ipc_data_write_receive(&callid, &len)) {
  128.         ipc_answer_0(callid, EINVAL);
  129.         ipc_answer_0(rid, EINVAL);
  130.         return;
  131.     }
  132.    
  133.     name_buf = malloc(len + 1);
  134.     if (!name_buf) {
  135.         ipc_answer_0(callid, ENOMEM);
  136.         ipc_answer_0(rid, ENOMEM);
  137.         return;
  138.     }
  139.    
  140.     ipc_data_write_finalize(callid, name_buf, len);
  141.     ipc_answer_0(rid, EOK);
  142.    
  143.     if (pathname != NULL) {
  144.         free(pathname);
  145.         pathname = NULL;
  146.     }
  147.    
  148.     name_buf[len] = '\0';
  149.     pathname = name_buf;
  150. }
  151.  
  152. /** Receive a call setting arguments of the program to execute.
  153.  *
  154.  * @param rid
  155.  * @param request
  156.  */
  157. static void ldr_set_args(ipc_callid_t rid, ipc_call_t *request)
  158. {
  159.     ipc_callid_t callid;
  160.     size_t buf_size, arg_size;
  161.     char *p;
  162.     int n;
  163.    
  164.     if (!ipc_data_write_receive(&callid, &buf_size)) {
  165.         ipc_answer_0(callid, EINVAL);
  166.         ipc_answer_0(rid, EINVAL);
  167.         return;
  168.     }
  169.    
  170.     if (arg_buf != NULL) {
  171.         free(arg_buf);
  172.         arg_buf = NULL;
  173.     }
  174.    
  175.     if (argv != NULL) {
  176.         free(argv);
  177.         argv = NULL;
  178.     }
  179.    
  180.     arg_buf = malloc(buf_size + 1);
  181.     if (!arg_buf) {
  182.         ipc_answer_0(callid, ENOMEM);
  183.         ipc_answer_0(rid, ENOMEM);
  184.         return;
  185.     }
  186.    
  187.     ipc_data_write_finalize(callid, arg_buf, buf_size);
  188.    
  189.     arg_buf[buf_size] = '\0';
  190.    
  191.     /*
  192.      * Count number of arguments
  193.      */
  194.     p = arg_buf;
  195.     n = 0;
  196.     while (p < arg_buf + buf_size) {
  197.         arg_size = str_size(p);
  198.         p = p + arg_size + 1;
  199.         ++n;
  200.     }
  201.    
  202.     /* Allocate argv */
  203.     argv = malloc((n + 1) * sizeof(char *));
  204.    
  205.     if (argv == NULL) {
  206.         free(arg_buf);
  207.         ipc_answer_0(rid, ENOMEM);
  208.         return;
  209.     }
  210.  
  211.     /*
  212.      * Fill argv with argument pointers
  213.      */
  214.     p = arg_buf;
  215.     n = 0;
  216.     while (p < arg_buf + buf_size) {
  217.         argv[n] = p;
  218.        
  219.         arg_size = str_size(p);
  220.         p = p + arg_size + 1;
  221.         ++n;
  222.     }
  223.    
  224.     argc = n;
  225.     argv[n] = NULL;
  226.  
  227.     ipc_answer_0(rid, EOK);
  228. }
  229.  
  230. /** Receive a call setting preset files of the program to execute.
  231.  *
  232.  * @param rid
  233.  * @param request
  234.  */
  235. static void ldr_set_files(ipc_callid_t rid, ipc_call_t *request)
  236. {
  237.     ipc_callid_t callid;
  238.     size_t buf_size;
  239.     if (!ipc_data_write_receive(&callid, &buf_size)) {
  240.         ipc_answer_0(callid, EINVAL);
  241.         ipc_answer_0(rid, EINVAL);
  242.         return;
  243.     }
  244.    
  245.     if ((buf_size % sizeof(fdi_node_t)) != 0) {
  246.         ipc_answer_0(callid, EINVAL);
  247.         ipc_answer_0(rid, EINVAL);
  248.         return;
  249.     }
  250.    
  251.     if (fil_buf != NULL) {
  252.         free(fil_buf);
  253.         fil_buf = NULL;
  254.     }
  255.    
  256.     if (filv != NULL) {
  257.         free(filv);
  258.         filv = NULL;
  259.     }
  260.    
  261.     fil_buf = malloc(buf_size);
  262.     if (!fil_buf) {
  263.         ipc_answer_0(callid, ENOMEM);
  264.         ipc_answer_0(rid, ENOMEM);
  265.         return;
  266.     }
  267.    
  268.     ipc_data_write_finalize(callid, fil_buf, buf_size);
  269.    
  270.     int count = buf_size / sizeof(fdi_node_t);
  271.    
  272.     /* Allocate filvv */
  273.     filv = malloc((count + 1) * sizeof(fdi_node_t *));
  274.    
  275.     if (filv == NULL) {
  276.         free(fil_buf);
  277.         ipc_answer_0(rid, ENOMEM);
  278.         return;
  279.     }
  280.    
  281.     /*
  282.      * Fill filv with argument pointers
  283.      */
  284.     int i;
  285.     for (i = 0; i < count; i++)
  286.         filv[i] = &fil_buf[i];
  287.    
  288.     filc = count;
  289.     filv[count] = NULL;
  290.    
  291.     ipc_answer_0(rid, EOK);
  292. }
  293.  
  294. /** Load the previously selected program.
  295.  *
  296.  * @param rid
  297.  * @param request
  298.  * @return 0 on success, !0 on error.
  299.  */
  300. static int ldr_load(ipc_callid_t rid, ipc_call_t *request)
  301. {
  302.     int rc;
  303.    
  304.     rc = elf_load_file(pathname, 0, &prog_info);
  305.     if (rc != EE_OK) {
  306.         DPRINTF("Failed to load executable '%s'.\n", pathname);
  307.         ipc_answer_0(rid, EINVAL);
  308.         return 1;
  309.     }
  310.    
  311.     elf_create_pcb(&prog_info, &pcb);
  312.    
  313.     pcb.argc = argc;
  314.     pcb.argv = argv;
  315.    
  316.     pcb.filc = filc;
  317.     pcb.filv = filv;
  318.    
  319.     if (prog_info.interp == NULL) {
  320.         /* Statically linked program */
  321.         is_dyn_linked = false;
  322.         ipc_answer_0(rid, EOK);
  323.         return 0;
  324.     }
  325.    
  326.     rc = elf_load_file(prog_info.interp, 0, &interp_info);
  327.     if (rc != EE_OK) {
  328.         DPRINTF("Failed to load interpreter '%s.'\n",
  329.             prog_info.interp);
  330.         ipc_answer_0(rid, EINVAL);
  331.         return 1;
  332.     }
  333.    
  334.     is_dyn_linked = true;
  335.     ipc_answer_0(rid, EOK);
  336.    
  337.     return 0;
  338. }
  339.  
  340.  
  341. /** Run the previously loaded program.
  342.  *
  343.  * @param rid
  344.  * @param request
  345.  * @return 0 on success, !0 on error.
  346.  */
  347. static void ldr_run(ipc_callid_t rid, ipc_call_t *request)
  348. {
  349.     const char *cp;
  350.    
  351.     /* Set the task name. */
  352.     cp = str_rchr(pathname, '/');
  353.     cp = (cp == NULL) ? pathname : (cp + 1);
  354.     task_set_name(cp);
  355.    
  356.     if (is_dyn_linked == true) {
  357.         /* Dynamically linked program */
  358.         DPRINTF("Run ELF interpreter.\n");
  359.         DPRINTF("Entry point: 0x%lx\n", interp_info.entry);
  360.        
  361.         ipc_answer_0(rid, EOK);
  362.         elf_run(&interp_info, &pcb);
  363.     } else {
  364.         /* Statically linked program */
  365.         ipc_answer_0(rid, EOK);
  366.         elf_run(&prog_info, &pcb);
  367.     }
  368.    
  369.     /* Not reached */
  370. }
  371.  
  372. /** Handle loader connection.
  373.  *
  374.  * Receive and carry out commands (of which the last one should be
  375.  * to execute the loaded program).
  376.  */
  377. static void ldr_connection(ipc_callid_t iid, ipc_call_t *icall)
  378. {
  379.     ipc_callid_t callid;
  380.     ipc_call_t call;
  381.     int retval;
  382.    
  383.     /* Already have a connection? */
  384.     if (connected) {
  385.         ipc_answer_0(iid, ELIMIT);
  386.         return;
  387.     }
  388.    
  389.     connected = true;
  390.    
  391.     /* Accept the connection */
  392.     ipc_answer_0(iid, EOK);
  393.    
  394.     /* Ignore parameters, the connection is already open */
  395.     (void) iid;
  396.     (void) icall;
  397.    
  398.     while (1) {
  399.         callid = async_get_call(&call);
  400.        
  401.         switch (IPC_GET_METHOD(call)) {
  402.         case IPC_M_PHONE_HUNGUP:
  403.             exit(0);
  404.         case LOADER_GET_TASKID:
  405.             ldr_get_taskid(callid, &call);
  406.             continue;
  407.         case LOADER_SET_PATHNAME:
  408.             ldr_set_pathname(callid, &call);
  409.             continue;
  410.         case LOADER_SET_ARGS:
  411.             ldr_set_args(callid, &call);
  412.             continue;
  413.         case LOADER_SET_FILES:
  414.             ldr_set_files(callid, &call);
  415.             continue;
  416.         case LOADER_LOAD:
  417.             ldr_load(callid, &call);
  418.             continue;
  419.         case LOADER_RUN:
  420.             ldr_run(callid, &call);
  421.             /* Not reached */
  422.         default:
  423.             retval = ENOENT;
  424.             break;
  425.         }
  426.         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
  427.             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
  428.             DPRINTF("Responding EINVAL to method %d.\n",
  429.                 IPC_GET_METHOD(call));
  430.             ipc_answer_0(callid, EINVAL);
  431.         }
  432.     }
  433. }
  434.  
  435. /** Program loader main function.
  436.  */
  437. int main(int argc, char *argv[])
  438. {
  439.     ipcarg_t phonead;
  440.    
  441.     connected = false;
  442.    
  443.     /* Set a handler of incomming connections. */
  444.     async_set_client_connection(ldr_connection);
  445.    
  446.     /* Register at naming service. */
  447.     if (ipc_connect_to_me(PHONE_NS, SERVICE_LOAD, 0, 0, &phonead) != 0)
  448.         return -1;
  449.    
  450.     async_manager();
  451.    
  452.     /* Never reached */
  453.     return 0;
  454. }
  455.  
  456. /** @}
  457.  */
  458.