Subversion Repositories HelenOS

Rev

Rev 4344 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
3203 svoboda 1
/*
2
 * Copyright (c) 2001-2004 Jakub Jermar
3
 * Copyright (c) 2008 Jiri Svoboda
4
 * All rights reserved.
5
 *
6
 * Redistribution and use in source and binary forms, with or without
7
 * modification, are permitted provided that the following conditions
8
 * are met:
9
 *
10
 * - Redistributions of source code must retain the above copyright
11
 *   notice, this list of conditions and the following disclaimer.
12
 * - Redistributions in binary form must reproduce the above copyright
13
 *   notice, this list of conditions and the following disclaimer in the
14
 *   documentation and/or other materials provided with the distribution.
15
 * - The name of the author may not be used to endorse or promote products
16
 *   derived from this software without specific prior written permission.
17
 *
18
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
 */
29
 
30
/** @addtogroup genericproc
31
 * @{
32
 */
33
 
34
/**
35
 * @file
36
 * @brief   Running userspace programs.
37
 */
38
 
39
#include <main/uinit.h>
40
#include <proc/thread.h>
41
#include <proc/task.h>
42
#include <proc/uarg.h>
43
#include <mm/as.h>
44
#include <mm/slab.h>
45
#include <arch.h>
46
#include <adt/list.h>
47
#include <ipc/ipc.h>
48
#include <ipc/ipcrsc.h>
49
#include <security/cap.h>
50
#include <lib/elf.h>
51
#include <errno.h>
52
#include <syscall/copy.h>
53
#include <proc/program.h>
54
 
55
#ifndef LOADED_PROG_STACK_PAGES_NO
56
#define LOADED_PROG_STACK_PAGES_NO 1
57
#endif
58
 
59
/**
60
 * Points to the binary image used as the program loader. All non-initial
61
 * tasks are created from this executable image.
62
 */
63
void *program_loader = NULL;
64
 
3204 svoboda 65
/** Create a program using an existing address space.
3203 svoboda 66
 *
3204 svoboda 67
 * @param as        Address space containing a binary program image.
68
 * @param entry_addr    Program entry-point address in program address space.
3569 svoboda 69
 * @param name      Name to set for the program's task.
3204 svoboda 70
 * @param p     Buffer for storing program information.
3203 svoboda 71
 */
3569 svoboda 72
void program_create(as_t *as, uintptr_t entry_addr, char *name, program_t *p)
3203 svoboda 73
{
74
    as_area_t *a;
75
    uspace_arg_t *kernel_uarg;
76
 
77
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
78
    kernel_uarg->uspace_entry = (void *) entry_addr;
79
    kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
80
    kernel_uarg->uspace_thread_function = NULL;
81
    kernel_uarg->uspace_thread_arg = NULL;
82
    kernel_uarg->uspace_uarg = NULL;
83
 
3569 svoboda 84
    p->task = task_create(as, name);
3203 svoboda 85
    ASSERT(p->task);
86
 
87
    /*
88
     * Create the data as_area.
89
     */
90
    a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE,
91
        LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
92
        AS_AREA_ATTR_NONE, &anon_backend, NULL);
93
 
94
    /*
95
     * Create the main thread.
96
     */
97
    p->main_thread = thread_create(uinit, kernel_uarg, p->task,
98
        THREAD_FLAG_USPACE, "uinit", false);
99
    ASSERT(p->main_thread);
100
}
101
 
3204 svoboda 102
/** Parse an executable image in the kernel memory.
3203 svoboda 103
 *
104
 * If the image belongs to a program loader, it is registered as such,
105
 * (and *task is set to NULL). Otherwise a task is created from the
106
 * executable image. The task is returned in *task.
107
 *
3204 svoboda 108
 * @param image_addr    Address of an executable program image.
3569 svoboda 109
 * @param name      Name to set for the program's task.
3204 svoboda 110
 * @param p     Buffer for storing program info. If image_addr
111
 *          points to a loader image, p->task will be set to
112
 *          NULL and EOK will be returned.
3203 svoboda 113
 *
114
 * @return EOK on success or negative error code.
115
 */
3569 svoboda 116
int program_create_from_image(void *image_addr, char *name, program_t *p)
3203 svoboda 117
{
118
    as_t *as;
119
    unsigned int rc;
120
 
121
    as = as_create(0);
122
    ASSERT(as);
123
 
124
    rc = elf_load((elf_header_t *) image_addr, as, 0);
125
    if (rc != EE_OK) {
126
        as_destroy(as);
127
        p->task = NULL;
128
        p->main_thread = NULL;
129
        if (rc != EE_LOADER)
130
            return ENOTSUP;
131
 
132
        /* Register image as the program loader */
133
        ASSERT(program_loader == NULL);
134
        program_loader = image_addr;
135
        return EOK;
136
    }
137
 
3569 svoboda 138
    program_create(as, ((elf_header_t *) image_addr)->e_entry, name, p);
3203 svoboda 139
 
140
    return EOK;
141
}
142
 
143
/** Create a task from the program loader image.
144
 *
3569 svoboda 145
 * @param p Buffer for storing program info.
146
 * @param name  Name to set for the program's task.
147
 *
3204 svoboda 148
 * @return EOK on success or negative error code.
3203 svoboda 149
 */
3569 svoboda 150
int program_create_loader(program_t *p, char *name)
3203 svoboda 151
{
152
    as_t *as;
153
    unsigned int rc;
154
    void *loader;
155
 
156
    as = as_create(0);
157
    ASSERT(as);
158
 
159
    loader = program_loader;
160
    if (!loader) return ENOENT;
161
 
162
    rc = elf_load((elf_header_t *) program_loader, as, ELD_F_LOADER);
163
    if (rc != EE_OK) {
164
        as_destroy(as);
165
        return ENOENT;
166
    }
167
 
3569 svoboda 168
    program_create(as, ((elf_header_t *) program_loader)->e_entry,
169
        name, p);
3203 svoboda 170
 
171
    return EOK;
172
}
173
 
3204 svoboda 174
/** Make program ready.
3203 svoboda 175
 *
3204 svoboda 176
 * Switch program's main thread to the ready state.
3203 svoboda 177
 *
3204 svoboda 178
 * @param p Program to make ready.
3203 svoboda 179
 */
180
void program_ready(program_t *p)
181
{
182
    thread_ready(p->main_thread);
183
}
184
 
3204 svoboda 185
/** Syscall for creating a new loader instance from userspace.
3203 svoboda 186
 *
4343 svoboda 187
 * Creates a new task from the program loader image and sets
188
 * the task name.
3203 svoboda 189
 *
3569 svoboda 190
 * @param name          Name to set on the new task (typically the same
191
 *              as the command used to execute it).
3203 svoboda 192
 *
193
 * @return 0 on success or an error code from @ref errno.h.
194
 */
4343 svoboda 195
unative_t sys_program_spawn_loader(char *uspace_name, size_t name_len)
3203 svoboda 196
{
197
    program_t p;
198
    int rc;
3569 svoboda 199
    char namebuf[TASK_NAME_BUFLEN];
3203 svoboda 200
 
3569 svoboda 201
    /* Cap length of name and copy it from userspace. */
202
 
4344 svoboda 203
    if (name_len > TASK_NAME_BUFLEN - 1)
204
        name_len = TASK_NAME_BUFLEN - 1;
3569 svoboda 205
 
206
    rc = copy_from_uspace(namebuf, uspace_name, name_len);
207
    if (rc != 0)
208
        return (unative_t) rc;
209
 
4348 svoboda 210
    namebuf[name_len] = 0;
3569 svoboda 211
 
212
    /* Spawn the new task. */
213
 
214
    rc = program_create_loader(&p, namebuf);
3203 svoboda 215
    if (rc != 0)
216
        return rc;
217
 
218
    // FIXME: control the capabilities
219
    cap_set(p.task, cap_get(TASK));
220
 
221
    program_ready(&p);
222
 
223
    return EOK;
224
}
225
 
226
/** @}
227
 */