source: mainline/uspace/srv/loader/main.c@ b7f69f2

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since b7f69f2 was b7f69f2, checked in by Jakub Jermar <jakub@…>, 8 years ago

Add forgotten return
  • Property mode set to 100644
File size: 9.1 KB
Line 
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 <stdbool.h>
50#include <fcntl.h>
51#include <sys/types.h>
52#include <ipc/services.h>
53#include <ipc/loader.h>
54#include <ns.h>
55#include <loader/pcb.h>
56#include <entry_point.h>
57#include <errno.h>
58#include <async.h>
59#include <str.h>
60#include <as.h>
61#include <elf/elf.h>
62#include <elf/elf_load.h>
63#include <vfs/vfs.h>
64#include <vfs/inbox.h>
65
66#define DPRINTF(...)
67
68/** File that will be loaded */
69static char *progname = NULL;
70static int program_fd = -1;
71
72/** The Program control block */
73static pcb_t pcb;
74
75/** Current working directory */
76static char *cwd = NULL;
77
78/** Number of arguments */
79static int argc = 0;
80/** Argument vector */
81static char **argv = NULL;
82/** Buffer holding all arguments */
83static char *arg_buf = NULL;
84
85/** Inbox entries. */
86static struct pcb_inbox_entry inbox[INBOX_MAX_ENTRIES];
87static int inbox_entries = 0;
88
89static elf_info_t prog_info;
90
91/** Used to limit number of connections to one. */
92static bool connected = false;
93
94static 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 (!async_data_read_receive(&callid, &len)) {
103 async_answer_0(callid, EINVAL);
104 async_answer_0(rid, EINVAL);
105 return;
106 }
107
108 if (len > sizeof(task_id))
109 len = sizeof(task_id);
110
111 async_data_read_finalize(callid, &task_id, len);
112 async_answer_0(rid, EOK);
113}
114
115/** Receive a call setting the current working directory.
116 *
117 * @param rid
118 * @param request
119 */
120static void ldr_set_cwd(ipc_callid_t rid, ipc_call_t *request)
121{
122 char *buf;
123 int rc = async_data_write_accept((void **) &buf, true, 0, 0, 0, NULL);
124
125 if (rc == EOK) {
126 if (cwd != NULL)
127 free(cwd);
128
129 cwd = buf;
130 }
131
132 async_answer_0(rid, rc);
133}
134
135/** Receive a call setting the program to execute.
136 *
137 * @param rid
138 * @param request
139 */
140static void ldr_set_program(ipc_callid_t rid, ipc_call_t *request)
141{
142 ipc_callid_t writeid;
143 size_t namesize;
144 if (!async_data_write_receive(&writeid, &namesize)) {
145 async_answer_0(rid, EINVAL);
146 return;
147 }
148
149 char* name = malloc(namesize);
150 int rc = async_data_write_finalize(writeid, name, namesize);
151 if (rc != EOK) {
152 async_answer_0(rid, EINVAL);
153 return;
154 }
155
156 int file = vfs_receive_handle(true);
157 if (file < 0) {
158 async_answer_0(rid, EINVAL);
159 return;
160 }
161
162 progname = name;
163 program_fd = file;
164 async_answer_0(rid, EOK);
165}
166
167/** Receive a call setting arguments of the program to execute.
168 *
169 * @param rid
170 * @param request
171 */
172static void ldr_set_args(ipc_callid_t rid, ipc_call_t *request)
173{
174 char *buf;
175 size_t buf_size;
176 int rc = async_data_write_accept((void **) &buf, true, 0, 0, 0, &buf_size);
177
178 if (rc == EOK) {
179 /*
180 * Count number of arguments
181 */
182 char *cur = buf;
183 int count = 0;
184
185 while (cur < buf + buf_size) {
186 size_t arg_size = str_size(cur);
187 cur += arg_size + 1;
188 count++;
189 }
190
191 /*
192 * Allocate new argv
193 */
194 char **_argv = (char **) malloc((count + 1) * sizeof(char *));
195 if (_argv == NULL) {
196 free(buf);
197 async_answer_0(rid, ENOMEM);
198 return;
199 }
200
201 /*
202 * Fill the new argv with argument pointers
203 */
204 cur = buf;
205 count = 0;
206 while (cur < buf + buf_size) {
207 _argv[count] = cur;
208
209 size_t arg_size = str_size(cur);
210 cur += arg_size + 1;
211 count++;
212 }
213 _argv[count] = NULL;
214
215 /*
216 * Copy temporary data to global variables
217 */
218 if (arg_buf != NULL)
219 free(arg_buf);
220
221 if (argv != NULL)
222 free(argv);
223
224 argc = count;
225 arg_buf = buf;
226 argv = _argv;
227 }
228
229 async_answer_0(rid, rc);
230}
231
232/** Receive a call setting inbox files of the program to execute.
233 *
234 * @param rid
235 * @param request
236 */
237static void ldr_add_inbox(ipc_callid_t rid, ipc_call_t *request)
238{
239 if (inbox_entries == INBOX_MAX_ENTRIES) {
240 async_answer_0(rid, ERANGE);
241 return;
242 }
243
244 ipc_callid_t writeid;
245 size_t namesize;
246 if (!async_data_write_receive(&writeid, &namesize)) {
247 async_answer_0(rid, EINVAL);
248 return;
249 }
250
251 char* name = malloc(namesize);
252 int rc = async_data_write_finalize(writeid, name, namesize);
253 if (rc != EOK) {
254 async_answer_0(rid, EINVAL);
255 return;
256 }
257
258 int file = vfs_receive_handle(true);
259 if (file < 0) {
260 async_answer_0(rid, EINVAL);
261 return;
262 }
263
264 /*
265 * We need to set the root early for dynamically linked binaries so
266 * that the loader can use it too.
267 */
268 if (str_cmp(name, "root") == 0)
269 vfs_root_set(file);
270
271 inbox[inbox_entries].name = name;
272 inbox[inbox_entries].file = file;
273 inbox_entries++;
274 async_answer_0(rid, EOK);
275}
276
277/** Load the previously selected program.
278 *
279 * @param rid
280 * @param request
281 * @return 0 on success, !0 on error.
282 */
283static int ldr_load(ipc_callid_t rid, ipc_call_t *request)
284{
285 int rc = elf_load(program_fd, &prog_info);
286 if (rc != EE_OK) {
287 DPRINTF("Failed to load executable for '%s'.\n", progname);
288 async_answer_0(rid, EINVAL);
289 return 1;
290 }
291
292 elf_set_pcb(&prog_info, &pcb);
293
294 pcb.cwd = cwd;
295
296 pcb.argc = argc;
297 pcb.argv = argv;
298
299 pcb.inbox = inbox;
300 pcb.inbox_entries = inbox_entries;
301
302 async_answer_0(rid, rc);
303 return 0;
304}
305
306/** Run the previously loaded program.
307 *
308 * @param rid
309 * @param request
310 * @return 0 on success, !0 on error.
311 */
312static void ldr_run(ipc_callid_t rid, ipc_call_t *request)
313{
314 DPRINTF("Set task name\n");
315
316 /* Set the task name. */
317 task_set_name(progname);
318
319 /* Run program */
320 DPRINTF("Reply OK\n");
321 async_answer_0(rid, EOK);
322 DPRINTF("Jump to entry point at %p\n", pcb.entry);
323 entry_point_jmp(prog_info.finfo.entry, &pcb);
324
325 /* Not reached */
326}
327
328/** Handle loader connection.
329 *
330 * Receive and carry out commands (of which the last one should be
331 * to execute the loaded program).
332 */
333static void ldr_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
334{
335 /* Already have a connection? */
336 if (connected) {
337 async_answer_0(iid, ELIMIT);
338 return;
339 }
340
341 connected = true;
342
343 /* Accept the connection */
344 async_answer_0(iid, EOK);
345
346 /* Ignore parameters, the connection is already open */
347 (void) icall;
348
349 while (true) {
350 int retval;
351 ipc_call_t call;
352 ipc_callid_t callid = async_get_call(&call);
353
354 if (!IPC_GET_IMETHOD(call))
355 exit(0);
356
357 switch (IPC_GET_IMETHOD(call)) {
358 case LOADER_GET_TASKID:
359 ldr_get_taskid(callid, &call);
360 continue;
361 case LOADER_SET_CWD:
362 ldr_set_cwd(callid, &call);
363 continue;
364 case LOADER_SET_PROGRAM:
365 ldr_set_program(callid, &call);
366 continue;
367 case LOADER_SET_ARGS:
368 ldr_set_args(callid, &call);
369 continue;
370 case LOADER_ADD_INBOX:
371 ldr_add_inbox(callid, &call);
372 continue;
373 case LOADER_LOAD:
374 ldr_load(callid, &call);
375 continue;
376 case LOADER_RUN:
377 ldr_run(callid, &call);
378 /* Not reached */
379 default:
380 retval = EINVAL;
381 break;
382 }
383
384 async_answer_0(callid, retval);
385 }
386}
387
388/** Program loader main function.
389 */
390int main(int argc, char *argv[])
391{
392 async_set_fallback_port_handler(ldr_connection, NULL);
393
394 /* Introduce this task to the NS (give it our task ID). */
395 task_id_t id = task_get_id();
396 int rc = ns_intro(id);
397 if (rc != EOK)
398 return rc;
399
400 /* Create port */
401 port_id_t port;
402 rc = async_create_port(INTERFACE_LOADER, ldr_connection, NULL, &port);
403 if (rc != EOK)
404 return rc;
405
406 /* Register at naming service. */
407 rc = service_register(SERVICE_LOADER);
408 if (rc != EOK)
409 return rc;
410
411 async_manager();
412
413 /* Never reached */
414 return 0;
415}
416
417/** @}
418 */
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