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/*
* Copyright (c) 2008 Jiri Svoboda
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup loader
* @brief Loads and runs programs from VFS.
* @{
*/
/**
* @file
* @brief Loads and runs programs from VFS.
*
* The program loader is a special init binary. Its image is used
* to create a new task upon a @c task_spawn syscall. The syscall
* returns the id of a phone connected to the newly created task.
*
* The caller uses this phone to send the pathname and various other
* information to the loader. This is normally done by the C library
* and completely hidden from applications.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <bool.h>
#include <fcntl.h>
#include <sys/types.h>
#include <ipc/ipc.h>
#include <ipc/services.h>
#include <ipc/loader.h>
#include <loader/pcb.h>
#include <errno.h>
#include <async.h>
#include <as.h>
#include <elf.h>
#include <elf_load.h>
#define DPRINTF(...)
/** Pathname of the file that will be loaded */
static char *pathname = NULL;
/** The Program control block */
static pcb_t pcb;
/** Number of arguments */
static int argc = 0;
/** Argument vector */
static char **argv = NULL;
/** Buffer holding all arguments */
static char *arg_buf = NULL;
static elf_info_t prog_info;
static elf_info_t interp_info;
static bool is_dyn_linked;
/** Used to limit number of connections to one. */
static bool connected;
static void loader_get_taskid(ipc_callid_t rid, ipc_call_t *request)
{
ipc_callid_t callid;
task_id_t task_id;
size_t len;
task_id = task_get_id();
if (!ipc_data_read_receive(&callid, &len)) {
ipc_answer_0(callid, EINVAL);
ipc_answer_0(rid, EINVAL);
return;
}
if (len > sizeof(task_id))
len = sizeof(task_id);
ipc_data_read_finalize(callid, &task_id, len);
ipc_answer_0(rid, EOK);
}
/** Receive a call setting pathname of the program to execute.
*
* @param rid
* @param request
*/
static void loader_set_pathname(ipc_callid_t rid, ipc_call_t *request)
{
ipc_callid_t callid;
size_t len;
char *name_buf;
if (!ipc_data_write_receive(&callid, &len)) {
ipc_answer_0(callid, EINVAL);
ipc_answer_0(rid, EINVAL);
return;
}
name_buf = malloc(len + 1);
if (!name_buf) {
ipc_answer_0(callid, ENOMEM);
ipc_answer_0(rid, ENOMEM);
return;
}
ipc_data_write_finalize(callid, name_buf, len);
ipc_answer_0(rid, EOK);
if (pathname != NULL) {
free(pathname);
pathname = NULL;
}
name_buf[len] = '\0';
pathname = name_buf;
}
/** Receive a call setting arguments of the program to execute.
*
* @param rid
* @param request
*/
static void loader_set_args(ipc_callid_t rid, ipc_call_t *request)
{
ipc_callid_t callid;
size_t buf_len, arg_len;
char *p;
int n;
if (!ipc_data_write_receive(&callid, &buf_len)) {
ipc_answer_0(callid, EINVAL);
ipc_answer_0(rid, EINVAL);
return;
}
if (arg_buf != NULL) {
free(arg_buf);
arg_buf = NULL;
}
if (argv != NULL) {
free(argv);
argv = NULL;
}
arg_buf = malloc(buf_len + 1);
if (!arg_buf) {
ipc_answer_0(callid, ENOMEM);
ipc_answer_0(rid, ENOMEM);
return;
}
ipc_data_write_finalize(callid, arg_buf, buf_len);
ipc_answer_0(rid, EOK);
arg_buf[buf_len] = '\0';
/*
* Count number of arguments
*/
p = arg_buf;
n = 0;
while (p < arg_buf + buf_len) {
arg_len = strlen(p);
p = p + arg_len + 1;
++n;
}
/* Allocate argv */
argv = malloc((n + 1) * sizeof(char *));
if (argv == NULL) {
free(arg_buf);
ipc_answer_0(callid, ENOMEM);
ipc_answer_0(rid, ENOMEM);
return;
}
/*
* Fill argv with argument pointers
*/
p = arg_buf;
n = 0;
while (p < arg_buf + buf_len) {
argv[n] = p;
arg_len = strlen(p);
p = p + arg_len + 1;
++n;
}
argc = n;
argv[n] = NULL;
}
/** Load the previously selected program.
*
* @param rid
* @param request
* @return 0 on success, !0 on error.
*/
static int loader_load(ipc_callid_t rid, ipc_call_t *request)
{
int rc;
rc = elf_load_file(pathname, 0, &prog_info);
if (rc < 0) {
DPRINTF("Failed to load executable '%s'.\n", pathname);
ipc_answer_0(rid, EINVAL);
return 1;
}
elf_create_pcb(&prog_info, &pcb);
pcb.argc = argc;
pcb.argv = argv;
if (prog_info.interp == NULL) {
/* Statically linked program */
is_dyn_linked = false;
ipc_answer_0(rid, EOK);
return 0;
}
rc = elf_load_file(prog_info.interp, 0, &interp_info);
if (rc < 0) {
DPRINTF("Failed to load interpreter '%s.'\n",
prog_info.interp);
ipc_answer_0(rid, EINVAL);
return 1;
}
is_dyn_linked = true;
ipc_answer_0(rid, EOK);
return 0;
}
/** Run the previously loaded program.
*
* @param rid
* @param request
* @return 0 on success, !0 on error.
*/
static void loader_run(ipc_callid_t rid, ipc_call_t *request)
{
const char *cp;
/* Set the task name. */
cp = strrchr(pathname, '/');
cp = (cp == NULL) ? pathname : (cp + 1);
task_set_name(cp);
if (is_dyn_linked == true) {
/* Dynamically linked program */
DPRINTF("Run ELF interpreter.\n");
DPRINTF("Entry point: 0x%lx\n", interp_info.entry);
close_console();
ipc_answer_0(rid, EOK);
elf_run(&interp_info, &pcb);
} else {
/* Statically linked program */
close_console();
ipc_answer_0(rid, EOK);
elf_run(&prog_info, &pcb);
}
/* Not reached */
}
/** Handle loader connection.
*
* Receive and carry out commands (of which the last one should be
* to execute the loaded program).
*/
static void loader_connection(ipc_callid_t iid, ipc_call_t *icall)
{
ipc_callid_t callid;
ipc_call_t call;
int retval;
/* Already have a connection? */
if (connected) {
ipc_answer_0(iid, ELIMIT);
return;
}
connected = true;
/* Accept the connection */
ipc_answer_0(iid, EOK);
/* Ignore parameters, the connection is already open */
(void) iid;
(void) icall;
while (1) {
callid = async_get_call(&call);
switch (IPC_GET_METHOD(call)) {
case IPC_M_PHONE_HUNGUP:
exit(0);
case LOADER_GET_TASKID:
loader_get_taskid(callid, &call);
continue;
case LOADER_SET_PATHNAME:
loader_set_pathname(callid, &call);
continue;
case LOADER_SET_ARGS:
loader_set_args(callid, &call);
continue;
case LOADER_LOAD:
loader_load(callid, &call);
continue;
case LOADER_RUN:
loader_run(callid, &call);
/* Not reached */
default:
retval = ENOENT;
break;
}
if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
DPRINTF("Responding EINVAL to method %d.\n",
IPC_GET_METHOD(call));
ipc_answer_0(callid, EINVAL);
}
}
}
/** Program loader main function.
*/
int main(int argc, char *argv[])
{
ipcarg_t phonead;
connected = false;
/* Set a handler of incomming connections. */
async_set_client_connection(loader_connection);
/* Register at naming service. */
if (ipc_connect_to_me(PHONE_NS, SERVICE_LOAD, 0, 0, &phonead) != 0)
return -1;
async_manager();
/* Never reached */
return 0;
}
/** @}
*/