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* Copyright (c) 2008 Jiri Svoboda
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/** @addtogroup loader
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* @brief Loads and runs programs from VFS.
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* @brief Loads and runs programs from VFS.
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* The program loader is a special init binary. Its image is used
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* to create a new task upon a @c task_spawn syscall. The syscall
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* returns the id of a phone connected to the newly created task.
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* The caller uses this phone to send the pathname and various other
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* information to the loader. This is normally done by the C library
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* and completely hidden from applications.
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#include <sys/types.h>
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#include <ipc/services.h>
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#include <ipc/loader.h>
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#include <loader/pcb.h>
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/** Pathname of the file that will be loaded */
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static char *pathname = NULL;
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/** The Program control block */
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/** Number of arguments */
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/** Argument vector */
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static char **argv = NULL;
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/** Buffer holding all arguments */
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static char *arg_buf = NULL;
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/** Number of preset files */
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/** Preset files vector */
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static fdi_node_t **filv = NULL;
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/** Buffer holding all preset files */
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static fdi_node_t *fil_buf = NULL;
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static elf_info_t prog_info;
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static elf_info_t interp_info;
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static bool is_dyn_linked;
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/** Used to limit number of connections to one. */
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static bool connected;
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static void ldr_get_taskid(ipc_callid_t rid, ipc_call_t *request)
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task_id = task_get_id();
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if (!ipc_data_read_receive(&callid, &len)) {
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ipc_answer_0(callid, EINVAL);
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ipc_answer_0(rid, EINVAL);
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if (len > sizeof(task_id))
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len = sizeof(task_id);
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ipc_data_read_finalize(callid, &task_id, len);
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ipc_answer_0(rid, EOK);
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/** Receive a call setting pathname of the program to execute.
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static void ldr_set_pathname(ipc_callid_t rid, ipc_call_t *request)
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if (!ipc_data_write_receive(&callid, &len)) {
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ipc_answer_0(callid, EINVAL);
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ipc_answer_0(rid, EINVAL);
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name_buf = malloc(len + 1);
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ipc_answer_0(callid, ENOMEM);
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ipc_answer_0(rid, ENOMEM);
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ipc_data_write_finalize(callid, name_buf, len);
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ipc_answer_0(rid, EOK);
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if (pathname != NULL) {
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name_buf[len] = '\0';
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/** Receive a call setting arguments of the program to execute.
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static void ldr_set_args(ipc_callid_t rid, ipc_call_t *request)
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size_t buf_size, arg_size;
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if (!ipc_data_write_receive(&callid, &buf_size)) {
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ipc_answer_0(callid, EINVAL);
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ipc_answer_0(rid, EINVAL);
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if (arg_buf != NULL) {
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arg_buf = malloc(buf_size + 1);
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ipc_answer_0(callid, ENOMEM);
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ipc_answer_0(rid, ENOMEM);
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ipc_data_write_finalize(callid, arg_buf, buf_size);
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arg_buf[buf_size] = '\0';
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* Count number of arguments
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while (p < arg_buf + buf_size) {
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arg_size = str_size(p);
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p = p + arg_size + 1;
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argv = malloc((n + 1) * sizeof(char *));
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ipc_answer_0(rid, ENOMEM);
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* Fill argv with argument pointers
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while (p < arg_buf + buf_size) {
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arg_size = str_size(p);
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p = p + arg_size + 1;
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ipc_answer_0(rid, EOK);
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/** Receive a call setting preset files of the program to execute.
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static void ldr_set_files(ipc_callid_t rid, ipc_call_t *request)
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if (!ipc_data_write_receive(&callid, &buf_size)) {
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ipc_answer_0(callid, EINVAL);
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ipc_answer_0(rid, EINVAL);
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if ((buf_size % sizeof(fdi_node_t)) != 0) {
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ipc_answer_0(callid, EINVAL);
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ipc_answer_0(rid, EINVAL);
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if (fil_buf != NULL) {
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fil_buf = malloc(buf_size);
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ipc_answer_0(callid, ENOMEM);
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ipc_answer_0(rid, ENOMEM);
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ipc_data_write_finalize(callid, fil_buf, buf_size);
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int count = buf_size / sizeof(fdi_node_t);
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filv = malloc((count + 1) * sizeof(fdi_node_t *));
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ipc_answer_0(rid, ENOMEM);
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* Fill filv with argument pointers
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for (i = 0; i < count; i++)
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filv[i] = &fil_buf[i];
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ipc_answer_0(rid, EOK);
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/** Load the previously selected program.
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* @return 0 on success, !0 on error.
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static int ldr_load(ipc_callid_t rid, ipc_call_t *request)
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rc = elf_load_file(pathname, 0, &prog_info);
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DPRINTF("Failed to load executable '%s'.\n", pathname);
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ipc_answer_0(rid, EINVAL);
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elf_create_pcb(&prog_info, &pcb);
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if (prog_info.interp == NULL) {
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/* Statically linked program */
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is_dyn_linked = false;
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ipc_answer_0(rid, EOK);
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rc = elf_load_file(prog_info.interp, 0, &interp_info);
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DPRINTF("Failed to load interpreter '%s.'\n",
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ipc_answer_0(rid, EINVAL);
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is_dyn_linked = true;
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ipc_answer_0(rid, EOK);
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/** Run the previously loaded program.
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* @return 0 on success, !0 on error.
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static void ldr_run(ipc_callid_t rid, ipc_call_t *request)
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/* Set the task name. */
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cp = str_rchr(pathname, '/');
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cp = (cp == NULL) ? pathname : (cp + 1);
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if (is_dyn_linked == true) {
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/* Dynamically linked program */
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DPRINTF("Run ELF interpreter.\n");
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DPRINTF("Entry point: 0x%lx\n", interp_info.entry);
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ipc_answer_0(rid, EOK);
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elf_run(&interp_info, &pcb);
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/* Statically linked program */
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ipc_answer_0(rid, EOK);
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elf_run(&prog_info, &pcb);
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/** Handle loader connection.
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* Receive and carry out commands (of which the last one should be
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* to execute the loaded program).
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static void ldr_connection(ipc_callid_t iid, ipc_call_t *icall)
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/* Already have a connection? */
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ipc_answer_0(iid, ELIMIT);
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/* Accept the connection */
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ipc_answer_0(iid, EOK);
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/* Ignore parameters, the connection is already open */
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callid = async_get_call(&call);
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switch (IPC_GET_METHOD(call)) {
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case IPC_M_PHONE_HUNGUP:
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case LOADER_GET_TASKID:
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ldr_get_taskid(callid, &call);
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case LOADER_SET_PATHNAME:
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ldr_set_pathname(callid, &call);
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case LOADER_SET_ARGS:
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ldr_set_args(callid, &call);
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case LOADER_SET_FILES:
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ldr_set_files(callid, &call);
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ldr_load(callid, &call);
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ldr_run(callid, &call);
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if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
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IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
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DPRINTF("Responding EINVAL to method %d.\n",
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IPC_GET_METHOD(call));
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ipc_answer_0(callid, EINVAL);
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/** Program loader main function.
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int main(int argc, char *argv[])
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/* Introduce this task to the NS (give it our task ID). */
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rc = async_req_2_0(PHONE_NS, NS_ID_INTRO, LOWER32(id), UPPER32(id));
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/* Set a handler of incomming connections. */
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async_set_client_connection(ldr_connection);
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/* Register at naming service. */
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if (ipc_connect_to_me(PHONE_NS, SERVICE_LOAD, 0, 0, &phonead) != 0)