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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. void program_run(void *entry, pcb_t *pcb);
  69.  
  70. /** Pathname of the file that will be loaded */
  71. static char *pathname = NULL;
  72.  
  73. /** The Program control block */
  74. static pcb_t pcb;
  75.  
  76. /** Number of arguments */
  77. static int argc = 0;
  78. /** Argument vector */
  79. static char **argv = NULL;
  80. /** Buffer holding all arguments */
  81. static char *arg_buf = NULL;
  82.  
  83. /** Number of preset files */
  84. static int filc = 0;
  85. /** Preset files vector */
  86. static fdi_node_t **filv = NULL;
  87. /** Buffer holding all preset files */
  88. static fdi_node_t *fil_buf = NULL;
  89.  
  90. static elf_info_t prog_info;
  91. static elf_info_t interp_info;
  92.  
  93. static bool is_dyn_linked;
  94.  
  95. /** Used to limit number of connections to one. */
  96. static bool connected;
  97.  
  98. static void ldr_get_taskid(ipc_callid_t rid, ipc_call_t *request)
  99. {
  100.     ipc_callid_t callid;
  101.     task_id_t task_id;
  102.     size_t len;
  103.    
  104.     task_id = task_get_id();
  105.    
  106.     if (!ipc_data_read_receive(&callid, &len)) {
  107.         ipc_answer_0(callid, EINVAL);
  108.         ipc_answer_0(rid, EINVAL);
  109.         return;
  110.     }
  111.    
  112.     if (len > sizeof(task_id))
  113.         len = sizeof(task_id);
  114.    
  115.     ipc_data_read_finalize(callid, &task_id, len);
  116.     ipc_answer_0(rid, EOK);
  117. }
  118.  
  119.  
  120. /** Receive a call setting pathname of the program to execute.
  121.  *
  122.  * @param rid
  123.  * @param request
  124.  */
  125. static void ldr_set_pathname(ipc_callid_t rid, ipc_call_t *request)
  126. {
  127.     ipc_callid_t callid;
  128.     size_t len;
  129.     char *name_buf;
  130.    
  131.     if (!ipc_data_write_receive(&callid, &len)) {
  132.         ipc_answer_0(callid, EINVAL);
  133.         ipc_answer_0(rid, EINVAL);
  134.         return;
  135.     }
  136.    
  137.     name_buf = malloc(len + 1);
  138.     if (!name_buf) {
  139.         ipc_answer_0(callid, ENOMEM);
  140.         ipc_answer_0(rid, ENOMEM);
  141.         return;
  142.     }
  143.    
  144.     ipc_data_write_finalize(callid, name_buf, len);
  145.     ipc_answer_0(rid, EOK);
  146.    
  147.     if (pathname != NULL) {
  148.         free(pathname);
  149.         pathname = NULL;
  150.     }
  151.    
  152.     name_buf[len] = '\0';
  153.     pathname = name_buf;
  154. }
  155.  
  156. /** Receive a call setting arguments of the program to execute.
  157.  *
  158.  * @param rid
  159.  * @param request
  160.  */
  161. static void ldr_set_args(ipc_callid_t rid, ipc_call_t *request)
  162. {
  163.     ipc_callid_t callid;
  164.     size_t buf_size, arg_size;
  165.     char *p;
  166.     int n;
  167.    
  168.     if (!ipc_data_write_receive(&callid, &buf_size)) {
  169.         ipc_answer_0(callid, EINVAL);
  170.         ipc_answer_0(rid, EINVAL);
  171.         return;
  172.     }
  173.    
  174.     if (arg_buf != NULL) {
  175.         free(arg_buf);
  176.         arg_buf = NULL;
  177.     }
  178.    
  179.     if (argv != NULL) {
  180.         free(argv);
  181.         argv = NULL;
  182.     }
  183.    
  184.     arg_buf = malloc(buf_size + 1);
  185.     if (!arg_buf) {
  186.         ipc_answer_0(callid, ENOMEM);
  187.         ipc_answer_0(rid, ENOMEM);
  188.         return;
  189.     }
  190.    
  191.     ipc_data_write_finalize(callid, arg_buf, buf_size);
  192.    
  193.     arg_buf[buf_size] = '\0';
  194.    
  195.     /*
  196.      * Count number of arguments
  197.      */
  198.     p = arg_buf;
  199.     n = 0;
  200.     while (p < arg_buf + buf_size) {
  201.         arg_size = str_size(p);
  202.         p = p + arg_size + 1;
  203.         ++n;
  204.     }
  205.    
  206.     /* Allocate argv */
  207.     argv = malloc((n + 1) * sizeof(char *));
  208.    
  209.     if (argv == NULL) {
  210.         free(arg_buf);
  211.         ipc_answer_0(rid, ENOMEM);
  212.         return;
  213.     }
  214.  
  215.     /*
  216.      * Fill argv with argument pointers
  217.      */
  218.     p = arg_buf;
  219.     n = 0;
  220.     while (p < arg_buf + buf_size) {
  221.         argv[n] = p;
  222.        
  223.         arg_size = str_size(p);
  224.         p = p + arg_size + 1;
  225.         ++n;
  226.     }
  227.    
  228.     argc = n;
  229.     argv[n] = NULL;
  230.  
  231.     ipc_answer_0(rid, EOK);
  232. }
  233.  
  234. /** Receive a call setting preset files of the program to execute.
  235.  *
  236.  * @param rid
  237.  * @param request
  238.  */
  239. static void ldr_set_files(ipc_callid_t rid, ipc_call_t *request)
  240. {
  241.     ipc_callid_t callid;
  242.     size_t buf_size;
  243.     if (!ipc_data_write_receive(&callid, &buf_size)) {
  244.         ipc_answer_0(callid, EINVAL);
  245.         ipc_answer_0(rid, EINVAL);
  246.         return;
  247.     }
  248.    
  249.     if ((buf_size % sizeof(fdi_node_t)) != 0) {
  250.         ipc_answer_0(callid, EINVAL);
  251.         ipc_answer_0(rid, EINVAL);
  252.         return;
  253.     }
  254.    
  255.     if (fil_buf != NULL) {
  256.         free(fil_buf);
  257.         fil_buf = NULL;
  258.     }
  259.    
  260.     if (filv != NULL) {
  261.         free(filv);
  262.         filv = NULL;
  263.     }
  264.    
  265.     fil_buf = malloc(buf_size);
  266.     if (!fil_buf) {
  267.         ipc_answer_0(callid, ENOMEM);
  268.         ipc_answer_0(rid, ENOMEM);
  269.         return;
  270.     }
  271.    
  272.     ipc_data_write_finalize(callid, fil_buf, buf_size);
  273.    
  274.     int count = buf_size / sizeof(fdi_node_t);
  275.    
  276.     /* Allocate filvv */
  277.     filv = malloc((count + 1) * sizeof(fdi_node_t *));
  278.    
  279.     if (filv == NULL) {
  280.         free(fil_buf);
  281.         ipc_answer_0(rid, ENOMEM);
  282.         return;
  283.     }
  284.    
  285.     /*
  286.      * Fill filv with argument pointers
  287.      */
  288.     int i;
  289.     for (i = 0; i < count; i++)
  290.         filv[i] = &fil_buf[i];
  291.    
  292.     filc = count;
  293.     filv[count] = NULL;
  294.    
  295.     ipc_answer_0(rid, EOK);
  296. }
  297.  
  298. /** Load the previously selected program.
  299.  *
  300.  * @param rid
  301.  * @param request
  302.  * @return 0 on success, !0 on error.
  303.  */
  304. static int ldr_load(ipc_callid_t rid, ipc_call_t *request)
  305. {
  306.     int rc;
  307.    
  308.     rc = elf_load_file(pathname, 0, 0, &prog_info);
  309.     if (rc != EE_OK) {
  310.         DPRINTF("Failed to load executable '%s'.\n", pathname);
  311.         ipc_answer_0(rid, EINVAL);
  312.         return 1;
  313.     }
  314.    
  315.     elf_create_pcb(&prog_info, &pcb);
  316.    
  317.     pcb.argc = argc;
  318.     pcb.argv = argv;
  319.    
  320.     pcb.filc = filc;
  321.     pcb.filv = filv;
  322.    
  323.     if (prog_info.interp == NULL) {
  324.         /* Statically linked program */
  325.         is_dyn_linked = false;
  326.         ipc_answer_0(rid, EOK);
  327.         return 0;
  328.     }
  329.    
  330.     printf("Load ELF interpreter '%s'\n", prog_info.interp);
  331.     rc = elf_load_file(prog_info.interp, 0, 0, &interp_info);
  332.     if (rc != EE_OK) {
  333.         DPRINTF("Failed to load interpreter '%s.'\n",
  334.             prog_info.interp);
  335.         ipc_answer_0(rid, EINVAL);
  336.         return 1;
  337.     }
  338.    
  339.     printf("Run interpreter.\n");
  340.     printf("entry point: 0x%lx\n", interp_info.entry);
  341.     printf("pcb address: 0x%lx\n", &pcb);
  342.     printf("prog dynamic: 0x%lx\n", prog_info.dynamic);
  343.  
  344.     is_dyn_linked = true;
  345.     ipc_answer_0(rid, EOK);
  346.    
  347.     return 0;
  348. }
  349.  
  350.  
  351. /** Run the previously loaded program.
  352.  *
  353.  * @param rid
  354.  * @param request
  355.  * @return 0 on success, !0 on error.
  356.  */
  357. static void ldr_run(ipc_callid_t rid, ipc_call_t *request)
  358. {
  359.     const char *cp;
  360.    
  361.     /* Set the task name. */
  362.     cp = str_rchr(pathname, '/');
  363.     cp = (cp == NULL) ? pathname : (cp + 1);
  364.     task_set_name(cp);
  365.    
  366.     if (is_dyn_linked == true) {
  367.         /* Dynamically linked program */
  368.         DPRINTF("Run ELF interpreter.\n");
  369.         DPRINTF("Entry point: 0x%lx\n", interp_info.entry);
  370.        
  371.         ipc_answer_0(rid, EOK);
  372.         program_run(interp_info.entry, &pcb);
  373.     } else {
  374.         /* Statically linked program */
  375.         ipc_answer_0(rid, EOK);
  376.         program_run(prog_info.entry, &pcb);
  377.     }
  378.    
  379.     /* Not reached */
  380. }
  381.  
  382. /** Handle loader connection.
  383.  *
  384.  * Receive and carry out commands (of which the last one should be
  385.  * to execute the loaded program).
  386.  */
  387. static void ldr_connection(ipc_callid_t iid, ipc_call_t *icall)
  388. {
  389.     ipc_callid_t callid;
  390.     ipc_call_t call;
  391.     int retval;
  392.    
  393.     /* Already have a connection? */
  394.     if (connected) {
  395.         ipc_answer_0(iid, ELIMIT);
  396.         return;
  397.     }
  398.    
  399.     connected = true;
  400.    
  401.     /* Accept the connection */
  402.     ipc_answer_0(iid, EOK);
  403.    
  404.     /* Ignore parameters, the connection is already open */
  405.     (void) iid;
  406.     (void) icall;
  407.    
  408.     while (1) {
  409.         callid = async_get_call(&call);
  410.        
  411.         switch (IPC_GET_METHOD(call)) {
  412.         case IPC_M_PHONE_HUNGUP:
  413.             exit(0);
  414.         case LOADER_GET_TASKID:
  415.             ldr_get_taskid(callid, &call);
  416.             continue;
  417.         case LOADER_SET_PATHNAME:
  418.             ldr_set_pathname(callid, &call);
  419.             continue;
  420.         case LOADER_SET_ARGS:
  421.             ldr_set_args(callid, &call);
  422.             continue;
  423.         case LOADER_SET_FILES:
  424.             ldr_set_files(callid, &call);
  425.             continue;
  426.         case LOADER_LOAD:
  427.             ldr_load(callid, &call);
  428.             continue;
  429.         case LOADER_RUN:
  430.             ldr_run(callid, &call);
  431.             /* Not reached */
  432.         default:
  433.             retval = ENOENT;
  434.             break;
  435.         }
  436.         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
  437.             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
  438.             DPRINTF("Responding EINVAL to method %d.\n",
  439.                 IPC_GET_METHOD(call));
  440.             ipc_answer_0(callid, EINVAL);
  441.         }
  442.     }
  443. }
  444.  
  445. /** Program loader main function.
  446.  */
  447. int main(int argc, char *argv[])
  448. {
  449.     ipcarg_t phonead;
  450.     task_id_t id;
  451.     int rc;
  452.  
  453.     connected = false;
  454.  
  455.     /* Introduce this task to the NS (give it our task ID). */
  456.     id = task_get_id();
  457.     rc = async_req_2_0(PHONE_NS, NS_ID_INTRO, LOWER32(id), UPPER32(id));
  458.     if (rc != EOK)
  459.         return -1;
  460.  
  461.     /* Set a handler of incomming connections. */
  462.     async_set_client_connection(ldr_connection);
  463.    
  464.     /* Register at naming service. */
  465.     if (ipc_connect_to_me(PHONE_NS, SERVICE_LOAD, 0, 0, &phonead) != 0)
  466.         return -2;
  467.  
  468.     async_manager();
  469.    
  470.     /* Never reached */
  471.     return 0;
  472. }
  473.  
  474. /** @}
  475.  */
  476.