source: trunk/kernel/syscalls/sys_mmap.c @ 594

Last change on this file since 594 was 594, checked in by alain, 3 years ago

Fix various bugs in sys_stat() and sys_mmap() functions.
Improve debug in other functions.

File size: 9.6 KB
Line 
1/*
2 * sys_mmap.c - map files, memory or devices into process virtual address space
3 *
4 * Authors       Ghassan Almaless (2008,2009,2010,2011,2012)
5 *               Alain Greiner (2016,2017,2018)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MKH is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#include <hal_kernel_types.h>
26#include <hal_uspace.h>
27#include <hal_irqmask.h>
28#include <shared_syscalls.h>
29#include <errno.h>
30#include <thread.h>
31#include <printk.h>
32#include <mapper.h>
33#include <vfs.h>
34#include <process.h>
35#include <vmm.h>
36
37#include <syscalls.h>
38
39//////////////////////////////////
40int sys_mmap( mmap_attr_t * attr )
41{
42    vseg_t      * vseg;
43    cxy_t         vseg_cxy;
44    vseg_type_t   vseg_type;
45    mmap_attr_t   k_attr;       // attributes copy in kernel space
46    xptr_t        mapper_xp;
47    error_t       error;
48    reg_t         save_sr;      // required to enable IRQs
49
50        thread_t    * this    = CURRENT_THREAD;
51        process_t   * process = this->process;
52
53#if (DEBUG_SYS_MMAP || CONFIG_INSTRUMENTATION_SYSCALLS)
54uint64_t     tm_start = hal_get_cycles();
55#endif
56
57#if DEBUG_SYS_MMAP
58tm_start = hal_get_cycles();
59if ( DEBUG_SYS_MMAP < tm_start )
60printk("\n[%s] thread[%x,%x] enter / cycle %d\n",
61__FUNCTION__, process->pid, this->trdid, (uint32_t)tm_start );
62#endif
63
64    // check user buffer (containing attributes) is mapped
65    error = vmm_get_vseg( process , (intptr_t)attr , &vseg );
66
67    if( error )
68    {
69
70#if DEBUG_SYSCALLS_ERROR
71printk("\n[ERROR] in %s : thread[%x,%x] / mmap attributes unmapped %x\n",
72__FUNCTION__ , process->pid, this->trdid, (intptr_t)attr );
73vmm_display( process , false );
74#endif
75                this->errno = EINVAL;
76                return -1;
77    }
78
79    // copy attributes from user space to kernel space
80    hal_copy_from_uspace( &k_attr , attr , sizeof(mmap_attr_t) );
81
82    // get addr, fdid, offset, and length attributes
83    uint32_t  fdid   = k_attr.fdid;
84    uint32_t  offset = k_attr.offset;
85    uint32_t  length = k_attr.length;
86
87    // get flags
88    bool_t     map_fixed   = ( (k_attr.flags & MAP_FIXED)   != 0 );
89    bool_t     map_anon    = ( (k_attr.flags & MAP_ANON)    != 0 );
90    bool_t     map_remote  = ( (k_attr.flags & MAP_REMOTE)  != 0 );
91    bool_t     map_shared  = ( (k_attr.flags & MAP_SHARED)  != 0 );
92    bool_t     map_private = ( (k_attr.flags & MAP_PRIVATE) != 0 );
93
94    // MAP_FIXED not supported
95    if( map_fixed )
96    {
97
98#if DEBUG_SYSCALLS_ERROR
99printk("\n[ERROR] in %s : thread[%x,%x] / MAP_FIXED not supported\n",
100__FUNCTION__ , process->pid, this->trdid );
101#endif
102        this->errno = EINVAL;
103        return -1;
104    }
105
106    if( map_shared == map_private )
107    {
108
109#if DEBUG_SYSCALLS_ERROR
110printk("\n[ERROR] in %s : thread[%x,%x] / MAP_SHARED == MAP_PRIVATE\n",
111__FUNCTION__ , process->pid, this->trdid );
112#endif
113        this->errno = EINVAL;
114        return -1;
115    }
116
117    // FIXME handle Copy_On_Write for MAP_PRIVATE...
118
119    // test mmap type : can be FILE / ANON / REMOTE
120
121    if( (map_anon == false) && (map_remote == false) )   // FILE
122    {
123
124#if (DEBUG_SYS_MMAP & 1)
125if ( DEBUG_SYS_MMAP < tm_start )
126printk("\n[%s] thread[%x,%x] map file : fdid %d / offset %d / %d bytes\n",
127__FUNCTION__, process->pid, this->trdid, fdid, offset, length );
128#endif
129
130            // FIXME: handle concurent delete of file by another thread closing it
131
132                if( fdid >= CONFIG_PROCESS_FILE_MAX_NR ) 
133                {
134
135#if DEBUG_SYSCALLS_ERROR
136printk("\n[ERROR] in %s : thread[%x,%x] / bad file descriptor %d\n",
137__FUNCTION__ , process->pid , this->trdid , fdid );
138#endif
139            this->errno = EBADFD;
140            return -1;
141        }
142
143        // get extended pointer on file descriptor
144        xptr_t file_xp = process_fd_get_xptr( process , fdid );
145
146        if( file_xp == XPTR_NULL )
147        {
148
149#if DEBUG_SYSCALLS_ERROR
150printk("\n[ERROR] in %s : thread[%x,%x] / file descriptor %d not found\n",
151__FUNCTION__  , this->trdid , process->pid , fdid );
152#endif
153            this->errno = EBADFD;
154            return -1;
155        }
156
157        // get file cluster and local pointer
158        cxy_t        file_cxy = GET_CXY( file_xp );
159        vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp );
160
161#if (DEBUG_SYS_MMAP & 1)
162if ( DEBUG_SYS_MMAP < tm_start )
163printk("\n[%s] thread[%x,%x] get file pointer %x in cluster %x\n",
164__FUNCTION__, process->pid, this->trdid, file_ptr, file_cxy );
165#endif
166
167        // get inode pointer & mapper pointer
168        vfs_inode_t * inode_ptr  = hal_remote_lpt(XPTR(file_cxy , &file_ptr->inode ));
169        mapper_t    * mapper_ptr = hal_remote_lpt(XPTR(file_cxy , &file_ptr->mapper));
170
171        // get file size
172                uint32_t size = hal_remote_l32( XPTR( file_cxy , &inode_ptr->size ) );
173
174#if (DEBUG_SYS_MMAP & 1)
175if ( DEBUG_SYS_MMAP < tm_start )
176printk("\n[%s] thread[%x,%x] get file size : %d bytes\n",
177__FUNCTION__, process->pid, this->trdid, size );
178#endif
179
180        // chek offset and length arguments
181                if( (offset + length) > size)
182                {
183
184#if DEBUG_SYSCALLS_ERROR
185printk("\n[ERROR] in %s: thread[%x,%x] / offset(%d) + len(%d) >= file's size(%d)\n", 
186__FUNCTION__, process->pid, this->trdid, k_attr.offset, k_attr.length, size );
187#endif
188            this->errno = ERANGE;
189            return -1;
190                }
191
192/* TODO
193        // chek access rigths
194        uint32_t   file_attr  = hal_remote_l32(XPTR(file_cxy , &file_ptr->attr  ));
195        bool_t     prot_read  = ( (k_attr.prot & PROT_READ )   != 0 );
196        bool_t     prot_write = ( (k_attr.prot & PROT_WRITE)   != 0 );
197
198        // check access rights
199                if( (prot_read  && !(file_attr & FD_ATTR_READ_ENABLE)) ||
200                    (prot_write && !(file_attr & FD_ATTR_WRITE_ENABLE)) )
201                {
202
203#if DEBUG_SYSCALLS_ERROR
204printk("\n[ERROR] in %s: prot = %x / file_attr = %x / thread %x , process %x\n",
205__FUNCTION__ , k_attr.prot , file_attr , this->trdid , process->pid );
206#endif
207                        this->errno = EACCES;
208                        return -1;
209                }
210*/
211
212                // increment file refcount
213                vfs_file_count_up( file_xp );
214
215        mapper_xp = XPTR( file_cxy , mapper_ptr );
216        vseg_type = VSEG_TYPE_FILE;
217        vseg_cxy  = file_cxy;
218    }
219    else if ( map_anon )                                 // MAP_ANON
220    {
221        mapper_xp = XPTR_NULL;
222        vseg_type = VSEG_TYPE_ANON;
223        vseg_cxy  = local_cxy;
224
225#if (DEBUG_SYS_MMAP & 1)
226if ( DEBUG_SYS_MMAP < tm_start )
227printk("\n[%s] thread[%x,%x] map anon / %d bytes / cluster %x\n",
228__FUNCTION__, process->pid, this->trdid, length, vseg_cxy );
229#endif
230
231    } 
232    else                                                 // MAP_REMOTE
233    {
234        mapper_xp = XPTR_NULL;
235        vseg_type = VSEG_TYPE_REMOTE;
236        vseg_cxy  = k_attr.fdid;
237
238#if (DEBUG_SYS_MMAP & 1)
239if ( DEBUG_SYS_MMAP < tm_start )
240printk("\n[%s] thread[%x,%x] map remote / %d bytes / cluster %x\n",
241__FUNCTION__, process->pid, this->trdid, length, vseg_cxy );
242#endif
243 
244        if( cluster_is_undefined( vseg_cxy ) )
245        {
246
247#if DEBUG_SYSCALLS_ERROR
248printk("\n[ERROR] in %s : thread[%x,%x] / illegal cxy %x for REMOTE\n",
249__FUNCTION__, this->trdid , process->pid, vseg_cxy );
250#endif
251            this->errno = EINVAL;
252            return -1;
253        }
254    }
255
256    // enable IRQs
257    hal_enable_irq( &save_sr );
258
259    // get reference process cluster and local pointer
260    xptr_t      ref_xp  = process->ref_xp;
261    cxy_t       ref_cxy = GET_CXY( ref_xp );
262    process_t * ref_ptr = GET_PTR( ref_xp );
263
264    // create the vseg in reference cluster
265    if( local_cxy == ref_cxy )
266    {
267        vseg = vmm_create_vseg( process,
268                                vseg_type,
269                                0,               // vseg base (unused for mmap)
270                                length,          // vseg size
271                                offset,          // file offset
272                                0,               // file_size (unused for mmap)
273                                mapper_xp,
274                                vseg_cxy );
275    }
276    else
277    {
278        rpc_vmm_create_vseg_client( ref_cxy,
279                                    ref_ptr,
280                                    vseg_type,
281                                    0,            // vseg base (unused for mmap)
282                                    length,       // vseg size
283                                    offset,       // file offset
284                                    0,            // file size (unused for mmap)
285                                    mapper_xp,
286                                    vseg_cxy,
287                                    &vseg ); 
288    }
289   
290    // restore IRQs
291    hal_restore_irq( save_sr );
292
293    if( vseg == NULL )
294    {
295
296#if DEBUG_SYSCALLS_ERROR
297printk("\n[ERROR] in %s : thread[%x,%x] / cannot create vseg\n",
298__FUNCTION__, process->pid, this->trdid );
299#endif
300        this->errno = ENOMEM;
301        return -1;
302    }
303
304    // copy vseg base address to user space
305    hal_copy_to_uspace( &attr->addr , &vseg->min , sizeof(intptr_t) );
306
307    hal_fence();
308
309#if (DEBUG_SYS_MMAP || CONFIG_INSTRUMENTATION_SYSCALLS)
310uint64_t     tm_end = hal_get_cycles();
311#endif
312
313#if DEBUG_SYS_MMAP
314if ( DEBUG_SYS_MMAP < tm_start )
315printk("\n[%s] thread[%x,%x] exit / %s / cxy %x / base %x / size %d / cycle %d\n",
316__FUNCTION__, process->pid, this->trdid,
317vseg_type_str(vseg->type), vseg->cxy, vseg->min, length, (uint32_t)tm_end );
318#endif
319
320        return 0;
321
322}  // end sys_mmap()
323
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