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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 <fcntl.h>
  50. #include <sys/types.h>
  51. #include <ipc/ipc.h>
  52. #include <ipc/loader.h>
  53. #include <errno.h>
  54. #include <async.h>
  55. #include <as.h>
  56.  
  57. #include <elf.h>
  58. #include <elf_load.h>
  59. #include <pcb.h>
  60.  
  61. /**
  62.  * Bias used for loading the dynamic linker. This will be soon replaced
  63.  * by automatic placement.
  64.  */
  65. #define RTLD_BIAS 0x80000
  66.  
  67. /** Pathname of the file that will be loaded */
  68. static char *pathname = NULL;
  69.  
  70. /** Receive a call setting pathname of the program to execute.
  71.  *
  72.  * @param rid
  73.  * @param request
  74.  */
  75. static void iloader_set_pathname(ipc_callid_t rid, ipc_call_t *request)
  76. {
  77.     ipc_callid_t callid;
  78.     size_t len;
  79.     char *name_buf;
  80.  
  81.     if (!ipc_data_write_receive(&callid, &len)) {
  82.         ipc_answer_0(callid, EINVAL);
  83.         ipc_answer_0(rid, EINVAL);
  84.         return;
  85.     }
  86.  
  87.     name_buf = malloc(len + 1);
  88.     if (!name_buf) {
  89.         ipc_answer_0(callid, ENOMEM);
  90.         ipc_answer_0(rid, ENOMEM);
  91.         return;
  92.     }
  93.  
  94.     ipc_data_write_finalize(callid, name_buf, len);
  95.     ipc_answer_0(rid, EOK);
  96.  
  97.     if (pathname != NULL) {
  98.         free(pathname);
  99.         pathname = NULL;
  100.     }
  101.  
  102.     name_buf[len] = '\0';
  103.     pathname = name_buf;
  104. }
  105.  
  106. /** Load and run the previously selected program.
  107.  *
  108.  * @param rid
  109.  * @param request
  110.  * @return 0 on success, !0 on error.
  111.  */
  112. static int iloader_run(ipc_callid_t rid, ipc_call_t *request)
  113. {
  114.     int rc;
  115.     pcb_t *pcb;
  116.  
  117.     elf_info_t prog_info;
  118.     elf_info_t interp_info;
  119.  
  120. //  printf("Load program '%s'\n", pathname);
  121.  
  122.     rc = elf_load_file(pathname, 0, &prog_info);
  123.     if (rc < 0) {
  124.         printf("failed to load program\n");
  125.         ipc_answer_0(rid, EINVAL);
  126.         return 1;
  127.     }
  128.  
  129. //  printf("Create PCB\n");
  130.     if (elf_create_pcb(&prog_info) < 0) {
  131.         ipc_answer_0(rid, ENOMEM);
  132.         return 1;
  133.     }
  134.  
  135.     if (prog_info.interp == NULL) {
  136.         /* Statically linked program */
  137. //      printf("Run statically linked program\n");
  138. //      printf("entry point: 0x%llx\n", prog_info.entry);
  139.         ipc_answer_0(rid, EOK);
  140.         close_console();
  141.         elf_run(&prog_info);
  142.         return 0;
  143.     }
  144.  
  145.     printf("Load dynamic linker '%s'\n", prog_info.interp);
  146.     rc = elf_load_file("/rtld.so", RTLD_BIAS, &interp_info);
  147.     if (rc < 0) {
  148.         printf("failed to load dynamic linker\n");
  149.         ipc_answer_0(rid, EINVAL);
  150.         return 1;
  151.     }
  152.  
  153.     /*
  154.      * Provide dynamic linker with some useful data
  155.      */
  156.     pcb = (pcb_t *)PCB_ADDRESS;
  157.     pcb->rtld_dynamic = interp_info.dynamic;
  158.     pcb->rtld_bias = RTLD_BIAS;
  159.  
  160.     printf("run dynamic linker\n");
  161.     printf("entry point: 0x%llx\n", interp_info.entry);
  162.     close_console();
  163.  
  164.     ipc_answer_0(rid, EOK);
  165.     elf_run(&interp_info);
  166.  
  167.     /* Not reached(?) */
  168.     return 0;
  169. }
  170.  
  171. /** Handle loader connection.
  172.  *
  173.  * Receive and carry out commands (of which the last one should be
  174.  * to execute the loaded program).
  175.  */
  176. static void loader_connection(ipc_callid_t iid, ipc_call_t *icall)
  177. {
  178.     ipc_callid_t callid;
  179.     ipc_call_t call;
  180.     int retval;
  181.  
  182.     /* Ignore parameters, the connection is already open */
  183.     (void)iid; (void)icall;
  184.  
  185.     while (1) {
  186.         callid = async_get_call(&call);
  187. //      printf("received call from phone %d, method=%d\n",
  188. //          call.in_phone_hash, IPC_GET_METHOD(call));
  189.         switch (IPC_GET_METHOD(call)) {
  190.         case LOADER_SET_PATHNAME:
  191.             iloader_set_pathname(callid, &call);
  192.             continue;
  193.         case LOADER_RUN:
  194.             iloader_run(callid, &call);
  195.             exit(0);
  196.             continue;
  197.         default:
  198.             retval = ENOENT;
  199.             break;
  200.         }
  201.         if ((callid & IPC_CALLID_NOTIFICATION) == 0) {
  202.             printf("responding EINVAL to method %d\n", IPC_GET_METHOD(call));
  203.             ipc_answer_0(callid, EINVAL);
  204.         }
  205.     }
  206. }
  207.  
  208. /** Program loader main function.
  209.  */
  210. int main(int argc, char *argv[])
  211. {
  212.     ipc_callid_t callid;
  213.     ipc_call_t call;
  214.     ipcarg_t phone_hash;
  215.  
  216.     /* The first call only communicates the incoming phone hash */
  217.     callid = ipc_wait_for_call(&call);
  218.  
  219.     if (IPC_GET_METHOD(call) != LOADER_HELLO) {
  220.         if (IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP)
  221.             ipc_answer_0(callid, EINVAL);
  222.         return 1;
  223.     }
  224.  
  225.     ipc_answer_0(callid, EOK);
  226.     phone_hash = call.in_phone_hash;
  227.  
  228.     /*
  229.      * FIXME: up until now no async calls can be used!!!
  230.      * (Which means e.g. printf() cannot be used)
  231.      */
  232.     async_new_connection(phone_hash, 0, NULL, loader_connection);
  233.     async_manager();
  234.  
  235.     /* not reached */
  236.     return 0;
  237. }
  238.  
  239. /** @}
  240.  */
  241.