Subversion Repositories HelenOS

Rev

Rev 3101 | Rev 3155 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

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