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2928 | svoboda | 1 | /* |
2 | * Copyright (c) 2008 Jiri Svoboda |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup loader |
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30 | * @brief Loads and runs programs from VFS. |
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31 | * @{ |
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32 | */ |
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33 | /** |
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34 | * @file |
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3101 | svoboda | 35 | * @brief Loads and runs programs from VFS. |
36 | * |
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37 | * The program loader is a special init binary. Its image is used |
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38 | * to create a new task upon a @c task_spawn syscall. The syscall |
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39 | * returns the id of a phone connected to the newly created task. |
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40 | * |
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41 | * The caller uses this phone to send the pathname and various other |
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42 | * information to the loader. This is normally done by the C library |
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43 | * and completely hidden from applications. |
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2928 | svoboda | 44 | */ |
45 | |||
46 | #include <stdio.h> |
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3004 | svoboda | 47 | #include <stdlib.h> |
2928 | svoboda | 48 | #include <unistd.h> |
49 | #include <fcntl.h> |
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50 | #include <sys/types.h> |
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3004 | svoboda | 51 | #include <ipc/ipc.h> |
52 | #include <errno.h> |
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2959 | svoboda | 53 | #include <as.h> |
2928 | svoboda | 54 | |
2969 | svoboda | 55 | #include <elf.h> |
56 | #include <elf_load.h> |
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2989 | svoboda | 57 | #include <pcb.h> |
2928 | svoboda | 58 | |
3101 | svoboda | 59 | /** |
60 | * Bias used for loading the dynamic linker. This will be soon replaced |
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61 | * by automatic placement. |
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62 | */ |
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2972 | svoboda | 63 | #define RTLD_BIAS 0x80000 |
64 | |||
3101 | svoboda | 65 | /** Pathname of the file that will be loaded */ |
3004 | svoboda | 66 | static char *pathname = NULL; |
67 | |||
3101 | svoboda | 68 | /** Receive a call setting pathname of the program to execute. |
69 | * |
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70 | * @param rid |
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71 | * @param request |
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72 | */ |
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3004 | svoboda | 73 | void iloader_set_pathname(ipc_callid_t rid, ipc_call_t *request) |
2928 | svoboda | 74 | { |
3004 | svoboda | 75 | // ipc_callid_t callid; |
76 | size_t len; |
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77 | char *name_buf; |
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78 | |||
79 | /* printf("iloader_set_pathname\n"); |
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80 | if (!ipc_data_write_receive(&callid, &len)) { |
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81 | ipc_answer_0(callid, EINVAL); |
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82 | ipc_answer_0(rid, EINVAL); |
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83 | return; |
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84 | } |
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85 | */ |
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86 | len = IPC_GET_ARG2(*request); |
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87 | printf("alloc %d bytes\n", len+1); |
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88 | |||
89 | name_buf = malloc(len + 1); |
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90 | if (!name_buf) { |
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91 | // ipc_answer_0(callid, ENOMEM); |
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92 | ipc_answer_0(rid, ENOMEM); |
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93 | return; |
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94 | } |
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95 | |||
96 | printf("write_finalize\n"); |
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97 | ipc_data_write_finalize(rid, name_buf, len); |
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98 | // ipc_answer_0(rid, EOK); |
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99 | |||
100 | if (pathname != NULL) { |
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101 | free(pathname); |
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102 | pathname = NULL; |
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103 | } |
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104 | |||
105 | pathname = name_buf; |
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106 | } |
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107 | |||
3101 | svoboda | 108 | /** Load and run the previously selected program. |
109 | * |
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110 | * @param rid |
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111 | * @param request |
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112 | * @return 0 on success, !0 on error. |
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113 | */ |
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3004 | svoboda | 114 | int iloader_run(ipc_callid_t rid, ipc_call_t *request) |
115 | { |
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116 | int rc; |
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117 | pcb_t *pcb; |
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118 | |||
2964 | svoboda | 119 | elf_info_t prog_info; |
120 | elf_info_t interp_info; |
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2928 | svoboda | 121 | |
3004 | svoboda | 122 | printf("Load program '%s'\n", pathname); |
2928 | svoboda | 123 | |
3004 | svoboda | 124 | rc = elf_load_file(pathname, 0, &prog_info); |
2928 | svoboda | 125 | if (rc < 0) { |
126 | printf("failed to load program\n"); |
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127 | return 1; |
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128 | } |
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129 | |||
2959 | svoboda | 130 | printf("Create PCB\n"); |
2964 | svoboda | 131 | if (elf_create_pcb(&prog_info) < 0) return 1; |
2928 | svoboda | 132 | |
3004 | svoboda | 133 | if (prog_info.interp == NULL) { |
134 | /* Statically linked program */ |
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135 | printf("Run statically linked program\n"); |
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136 | elf_run(&prog_info); |
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137 | return 0; |
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138 | } |
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2988 | svoboda | 139 | |
3004 | svoboda | 140 | printf("Load dynamic linker '%s'\n", prog_info.interp); |
141 | rc = elf_load_file("/rtld.so", RTLD_BIAS, &interp_info); |
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2959 | svoboda | 142 | if (rc < 0) { |
143 | printf("failed to load dynamic linker\n"); |
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144 | return 1; |
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145 | } |
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146 | |||
2989 | svoboda | 147 | /* |
3004 | svoboda | 148 | * Provide dynamic linker with some useful data |
2989 | svoboda | 149 | */ |
150 | pcb = (pcb_t *)PCB_ADDRESS; |
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151 | pcb->rtld_dynamic = interp_info.dynamic; |
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152 | pcb->rtld_bias = RTLD_BIAS; |
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153 | |||
2959 | svoboda | 154 | printf("run dynamic linker\n"); |
2964 | svoboda | 155 | elf_run(&interp_info); |
2989 | svoboda | 156 | |
3004 | svoboda | 157 | return 0; |
158 | } |
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159 | |||
3101 | svoboda | 160 | /** Program loader main function. |
161 | * |
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162 | * Receive and carry out commands (of which the last one should be |
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163 | * to execute the loaded program). |
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164 | */ |
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3004 | svoboda | 165 | int main(int argc, char *argv[]) |
166 | { |
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167 | ipc_callid_t callid; |
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168 | ipc_call_t call; |
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169 | int retval; |
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170 | int len; |
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171 | |||
172 | while (1) { |
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173 | callid = ipc_wait_for_call(&call); |
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174 | printf("received call, method=%d\n", IPC_GET_METHOD(call)); |
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175 | switch (IPC_GET_METHOD(call)) { |
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176 | case IPC_M_DATA_WRITE: |
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177 | iloader_set_pathname(callid, &call); |
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178 | iloader_run(callid, &call); |
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179 | exit(0); |
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180 | continue; |
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181 | default: |
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182 | retval = ENOENT; |
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183 | break; |
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184 | } |
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185 | if ((callid & IPC_CALLID_NOTIFICATION) == 0) { |
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186 | printf("responding EINVAL to method %d\n", IPC_GET_METHOD(call)); |
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187 | ipc_answer_0(callid, EINVAL); |
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188 | } |
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189 | } |
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190 | |||
2928 | svoboda | 191 | /* not reached */ |
192 | return 0; |
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193 | } |
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194 | |||
195 | /** @} |
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196 | */ |