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source: trunk/kernel/kern/do_exec.c @ 365

Last change on this file since 365 was 353, checked in by max@…, 7 years ago
Don't include sys-vfs.h.
File size: 17.5 KB

Line
1	/*
2	* kern/do_exec.c - excecutes a new user process, load init.
3	*
4	* Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
5	* Copyright (c) 2011,2012,2013,2014,2015 UPMC Sorbonne Universites
6	*
7	* This file is part of ALMOS-kernel.
8	*
9	* ALMOS-kernel is free software; you can redistribute it and/or modify it
10	* under the terms of the GNU General Public License as published by
11	* the Free Software Foundation; version 2.0 of the License.
12	*
13	* ALMOS-kernel is distributed in the hope that it will be useful, but
14	* WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16	* General Public License for more details.
17	*
18	* You should have received a copy of the GNU General Public License
19	* along with ALMOS-kernel; if not, write to the Free Software Foundation,
20	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21	*/
22
23	#include <stdarg.h>
24	#include <config.h>
25	#include <errno.h>
26	#include <types.h>
27	#include <libk.h>
28	#include <bits.h>
29	#include <kmem.h>
30	#include <process.h>
31	#include <cpu.h>
32	#include <pmm.h>
33	#include <page.h>
34	#include <process.h>
35	#include <thread.h>
36	#include <pid.h>
37	#include <list.h>
38	#include <vfs.h>
39	#include <scheduler.h>
40	#include <spinlock.h>
41	#include <cluster.h>
42	#include <ku_transfert.h>
43	#include <dqdt.h>
44
45	#define USR_LIMIT (CONFIG_USR_LIMIT)
46
47	#define DEV_STDIN CONFIG_DEV_STDIN
48	#define DEV_STDOUT CONFIG_DEV_STDOUT
49	#define DEV_STDERR CONFIG_DEV_STDERR
50
51	#define TASK_DEFAULT_HEAP_SIZE CONFIG_TASK_HEAP_MIN_SIZE
52
53	#define INIT_PATH "/bin/init"
54
55	/* FIXME : ecopy et estrlen attendent une adresse de vecteur dans l'espace utilisateur. Or pour
56	* l'instant l'environnement des processus est "forgé" dans do_exec(), c'est donc des buffers
57	* noyaux. Solution temporaire : on utilise kexec_copy et kexec_strlen.
58	*/
59	//////////////////////////////////////
60	error_t args_len( char ** vect,
61	uint32_t pages_max,
62	uint32_t * pages_nr,
63	uint32_t * entries_nr,
64	exec_copy_t ecopy,
65	exec_strlen_t estrlen)
66	{
67	uint32_t cntr;
68	uint32_t pgnr;
69	error_t error;
70	uint32_t count;
71	uint32_t len;
72	char * ptr;
73
74	cntr = 0;
75	count = 0;
76	pgnr = 0;
77
78	while(1)
79	{
80	if((error = ecopy(&ptr, &vect[cntr], sizeof(ptr))))
81	{
82	printk(INFO, "INFO: %s:%s: EFAULT Has been Catched on vect, cntr %d, strlen &vect[%x] = %x\n", \
83	__FUNCTION__, __LINE__, cntr, &vect[cntr], vect[cntr]);
84	return err;
85	}
86
87	if(ptr == NULL)
88	break;
89
90	if((err=estrlen(ptr, &len)))
91	{
92	printk(INFO, "INFO: %s:%s: EFAULT Has been Catched, cntr %d, strlen &vect[%x] = %x\n", \
93	__FUNCTION__, __LINE__, cntr, &vect[cntr], vect[cntr]);
94	return err;
95	}
96	cntr ++;
97	len ++;
98	count += (ARROUND_UP(len, 8));
99	pgnr = ARROUND_UP(count, PMM_PAGE_SIZE);
100
101	if((pgnr >> PMM_PAGE_SHIFT) >= pages_max)
102	return E2BIG;
103	}
104
105	count = (cntr + 1) * sizeof(char*);
106	*pages_nr = (ARROUND_UP(count, PMM_PAGE_SIZE)) / PMM_PAGE_SIZE;
107	*entries_nr = cntr;
108	return 0;
109	}
110
111	//for now the pointers can be either be from uspace
112	//or kernel space. Solutions :
113	//first keep this binaroty and add a flag to
114	//choose how to copy the arguments
115	//second make them all user space ptr
116	//third make them kernel space ptr
117	//the first solution (although ugly), is the most
118	//perfroming(compared to u->k) and simple
119	//(compared to k->u)
120
121	//////////////////////////////////////////////
122	//////////////////////////////////////////////
123	error_t compute_args( process_t * process,
124	char ** vect,
125	page_t ** pgtbl,
126	uint32_t pages_max,
127	uint32_t start,
128	uint32_t * current,
129	uint32_t * pgnr,
130	uint32_t * pgindex,
131	exec_copy_t ecopy,
132	exec_strlen_t estrlen)
133	{
134	kmem_req_t req;
135	uint32_t count;
136	uint32_t cntr;
137	uint32_t pages_nr;
138	char ** args;
139	char * ptr;
140	uint32_t i;
141	uint32_t len;
142	uint32_t index;
143	uint32_t paddr;
144	error_t error;
145
146	req.type = KMEM_PAGE;
147	req.size = 0;
148	req.flags = AF_USER \| AF_ZERO \| AF_REMOTE;
149	req.ptr = process->cluster;
150
151	pages_nr = 0;
152	count = 0;
153	cntr = 0;
154	index = *pgindex;
155
156	error = args_len(vect, pages_max, &pages_nr, &cntr, ecopy, estrlen);
157
158	if( error ) return error;
159
160	*pgnr += pages_nr;
161
162	for(i = index; i < (pages_nr + index); i++)
163	{
164	pgtbl[i] = kmem_alloc(&req);
165
166	if(pgtbl[i] == NULL) return ENOMEM;
167	}
168
169	current = start - (pages_nr PMM_PAGE_SIZE);
170
171	paddr = (uint32_t) ppm_page2addr(pgtbl[index]);
172	count = (cntr + 1) * sizeof(char*);
173	args = (char **) paddr;
174	pages_nr = 0;
175
176	/* Copy the table of pointer */
177	while(count > PMM_PAGE_SIZE)
178	{
179	error = ecopy((void*)paddr, vect + (pages_nr << PMM_PAGE_SHIFT), PMM_PAGE_SIZE);
180
181	if( error ) return error;
182
183	index ++;
184	paddr = (uint32_t) ppm_page2addr(pgtbl[index]);
185	count -= PMM_PAGE_SIZE;
186	pages_nr ++;
187	}
188
189	if(count > 0)
190	{
191	error = ecopy((void*)paddr, vect + (pages_nr << PMM_PAGE_SHIFT), count);
192	if( error ) return error;
193	}
194
195	paddr += count;
196
197	/* Copy the the table of pointer content */
198	for(i=0; i < cntr; i++)
199	{
200	if((error = ecopy(&ptr, &vect[i], sizeof(ptr))))
201	{
202	printk(INFO, "INFO: %s: EFAULT Has been Catched on vect\n", __FUNCTION__);
203	return err;
204	}
205
206	error = estrlen(ptr, &len);
207	if(err) return err;
208	len++;
209
210
211	/* Update pointer */
212	args[i] = (char)(current + (pages_nr << PMM_PAGE_SHIFT) + count);
213
214	/* The content could span multiple pages */
215	while(len)
216	{
217	if((PMM_PAGE_SIZE - count) > (ARROUND_UP(len, 8)))
218	{
219	error = ecopy((void*)paddr, ptr, len);
220	if(err) return err;
221	paddr += (ARROUND_UP(len, 8));
222	count += (ARROUND_UP(len, 8));
223	len = 0;
224	}
225	else
226	{
227	error = ecopy((void*)paddr, ptr, PMM_PAGE_SIZE - count);
228	if(err) return err;
229	ptr += (PMM_PAGE_SIZE - count);
230	len -= (PMM_PAGE_SIZE - count);
231	index ++;
232	paddr = (uint32_t) ppm_page2addr(pgtbl[index]);
233	pages_nr ++;
234	count = 0;
235	}
236	}
237	}
238
239	*pgindex = index + 1;
240	return 0;
241	}
242
243	///////////////////////////////////////
244	error_t map_args( process_s * process,
245	page_t ** pgtbl,
246	uint32_t start_index,
247	uint32_t end_index,
248	uint32_t start_addr )
249	{
250	struct pmm_s *pmm;
251	pmm_page_info_t info;
252	uint32_t current_vma;
253	error_t err;
254	uint32_t i;
255
256	pmm = &process->vmm.pmm;
257	info.attr = PMM_PRESENT \| PMM_READ \| PMM_WRITE \| PMM_CACHED \| PMM_USER;
258	info.cluster = process->cluster;
259	current_vma = start_addr;
260
261	for(i = start_index; i < end_index; i++)
262	{
263	info.ppn = ppm_page2ppn(pgtbl[i]);
264
265	if((error = pmm_set_page(pmm, current_vma, &info)))
266	return err;
267
268	pgtbl[i] = NULL;
269	current_vma += PMM_PAGE_SIZE;
270	}
271
272	return 0;
273	}
274
275	//////////////////////////////////////
276	error_t do_exec( process_t * process,
277	char * pathname,
278	page_t * pgtbl[],
279	uint32_t env_end,
280	uint32_t env_index,
281	uint32_t argv_end, // user_stack_top
282	uint32_t argv_index,
283	thread_t ** new )
284	{
285	error_t error;
286	pthread_attr_t attr;
287	uint32_t usr_stack_top;
288	int32_t order;
289	thread_t * main_thread;
290
291	attr.arg2 = (void)env_end; / environ */
292	attr.arg1 = (void)argv_end; / argv */
293	usr_stack_top = argv_end;
294
295	/* FIXME:
296	* zero should not be hard-coded. Use something like MAIN_KERNEL which represents the
297	* kernel with the init and sh processes (assuming that both of them are on the same kernel).
298	*/
299
300	if( ((process->pid != PID_MIN_GLOBAL+1) && (current_cid == 0)) \|\|
301	( (process->pid != PID_MIN_GLOBAL) && (current_cid != 0) ) )
302	{
303	vmm_destroy(&process->vmm);
304	pmm_release(&process->vmm.pmm);
305	error = vmm_init(&process->vmm);
306	if(err) goto DO_EXEC_ERR;
307	}
308
309	attr.stack_addr = (void*)(usr_stack_top - CONFIG_PTHREAD_STACK_SIZE);
310	attr.stack_size = CONFIG_PTHREAD_STACK_SIZE;
311
312	// create stack vseg
313	error = (error_t) vmm_mmap( process,
314	attr.stack_addr, // base
315	USR_LIMIT - (uint32_t)attr.stack_addr, // size
316	VSEG_TYPE_STACK, // type
317	VSEG_RD \| VSEG_WR, // flags
318	// PRIVATE \| ANON \| STACK \| FIXED,
319	NULL, // file
320	0 ); // offset
321
322	if( error == VM_FAILURE )
323	{
324	error = CURRENT_THREAD->info.errno;
325	printk(INFO, "%s: failed to mmap main's stack for process %x / error = %d\n",
326	__FUNCTION__, process->pid , error );
327	return error;
328	}
329
330	// TODO ??? AG
331	error = map_args(process, pgtbl, 0, env_index, (uint32_t)attr.arg2);
332	if( error )
333	{
334	return error;
335	}
336
337	// TODO ??? AG
338	error = map_args(process, pgtbl, env_index, argv_index, (uint32_t)attr.arg1);
339	if(err)
340	{
341	return error;
342	}
343
344	// register "entry_point" in VMM, register "code" and "data" vsegs in VMM,
345	// using informations contained in the elf file identified by the pathname.
346	error = elf_load_process( path_name , process );
347	if( error )
348	{
349	printk(INFO, "%s: failed to access elf for process %x\n",
350	__FUNCTION__, process->pid );
351	return error;
352	}
353
354	// create "heap" vseg
355	error = (error_t) vmm_mmap( process,
356	(void *)process->vmm.heap_start, // base
357	PROCESS_DEFAULT_HEAP_SIZE, // size
358	VSEG_TYPE_HEAP, // type
359	VSEG_RD \| VSEG_WR, // flags
360	// PRIVATE \| ANON \| HEAP \| FIXED,
361	NULL, // file
362	0 ); // offset
363
364	if( error == VM_FAILURE )
365	{
366	error = CURRENT_THREAD->info.errno;
367	printk(INFO, "%s: failed to mmap heap for process %x\n",
368	__FUNCTION__, process->pid );
369	return error;
370	}
371
372	process->vmm.heap_current += TASK_DEFAULT_HEAP_SIZE;
373
374	// initialize pthread attributes
375	attr.pid = exec_info->pid;
376	attr.entry_func = (void*)process->vmm.entry_point;
377	attr.entry_args = bloup; // TODO [AG]
378	attr.flags = PT_FLAG_DETACH;
379	attr.stack_size = CONFIG_PTHREAD_STACK_SIZE;
380	attr.sched_policy = SCHED_RR;
381	attr.cxy = LOCAL_CLUSTER;
382	attr.lid = bloup; // TODO [AG]
383
384	// attr.flags = (CURRENT_THREAD->info.attr.flags \| PT_ATTR_DETACH);
385	// attr.sched_policy = SCHED_RR;
386	// attr.cid = process->cluster->id;
387	// attr.cpu_lid = process->cpu->lid;
388	// attr.cpu_gid = process->cpu->gid;
389	// attr.entry_func = (void*)process->vmm.entry_point;
390	// attr.exit_func = NULL;
391	// attr.stack_size = attr.stack_size - SIG_DEFAULT_STACK_SIZE;
392	// attr.sigstack_addr = (void*)((uint32_t)attr.stack_addr + attr.stack_size);
393	// attr.sigstack_size = SIG_DEFAULT_STACK_SIZE;
394	// attr.sigreturn_func = 0;
395
396	// create and initialise thread descriptor,
397	// register the thread in local process descriptor
398	error = thread_user_create( &attr , &main_thread );
399	if( error )
400	{
401	printk(INFO, "%s: failed to create main thread for process %x\n"
402	__FUNCTION__, process->pid );
403	return error;
404	}
405
406	return 0;
407	} // end do_exec()
408
409	//////////////////////////////////////////////////////////////////////
410	//
411	//////////////////////////////////////////////////////////////////////
412	error_t prepare_args( process_t * process,
413	char ** argv,
414	char ** envp,
415	page_t * pgtbl[],
416	uint32_t * argv_index,
417	uint32_t * env_index,
418	uint32_t * argv_end,
419	uint32_t * env_end,
420	exec_copy_t ecopy,
421	exec_strlen_t estrlen )
422	{
423	uint32_t usr_stack_top = USR_LIMIT;
424	uint32_t pages_nr = 0;
425	uint32_t pages_max = CONFIG_TASK_ARGS_PAGES_MAX_NR;
426	uint32_t index = 0;
427	error_t error = 0;
428
429	memset( &pgtbl[0] , 0 , pages_maxsizeof(page_t ) );
430
431	// env_index & env_end
432	error = compute_args( process,
433	envp,
434	&pgtbl[0],
435	pages_max,
436	USR_LIMIT,
437	&usr_stack_top,
438	&pages_nr,
439	&index,
440	ecopy,
441	estrlen );
442
443	*env_index = index;
444	env_end = usr_stack_top; / environ */
445
446	if( error ) return error;
447
448	// argv_index & argv_end
449	error = compute_args( process,
450	argv,
451	&pgtbl[0],
452	pages_max - pages_nr,
453	usr_stack_top,
454	&usr_stack_top,
455	&pages_nr,
456	&index,
457	ecopy,
458	estrlen );
459
460	*argv_index = index;
461	argv_end = usr_stack_top; / argv */
462
463	return error;
464	}
465
466	//////////////////////////////////
467	void free_args( page_t * pgtbl[] )
468	{
469	uint32_t index;
470
471	for(index = 0; index < CONFIG_TASK_ARGS_PAGES_MAX_NR; index ++)
472	{
473	if(pgtbl[index] != NULL)
474	ppm_free_pages(pgtbl[index]);
475	}
476	}
477
478	/////////////////////////////////////////////
479	error_t full_do_exec( process_t * process,
480	char * path_name,
481	char ** argv,
482	char ** envp,
483	uint32_t * isFatal,
484	thread_t ** new,
485	exec_copy_t ecopy,
486	exec_strlen_t estrlen )
487	{
488	error_t err;
489	uint32_t argv_index;
490	uint32_t env_index;
491	uint32_t argv_end;
492	uint32_t env_end;
493	page_t * pgtbl[CONFIG_TASK_ARGS_PAGES_MAX_NR];
494
495	*isFatal = 0;
496	error = prepare_args( process,
497	argv,
498	envp,
499	pgtbl,
500	&argv_index,
501	&env_index,
502	&argv_end,
503	&env_end,
504	ecopy,
505	estrlen );
506
507	if(err)
508	goto EXEC_EXIT;
509
510	error = do_exec( process,
511	path_name,
512	&pgtbl[0],
513	env_end,
514	env_index,
515	argv_end,
516	argv_index,
517	new );
518
519	if(err)
520	{
521	printk(INFO, "%s: do_exec failed", __FUNCTION__);
522	*isFatal = 1;
523	}
524
525	EXEC_EXIT:
526	if(err)
527	{
528	free_args(pgtbl);
529	}
530
531	return err;
532	}
533
534
535	///////////////////////////////////
536	error_t kexec_copy( void * dst,
537	void * src,
538	uint32_t count )
539	{
540	memcpy( dst , src , count );
541	return 0;
542	}
543
544	/////////////////////////////////////
545	error_t kexec_strlen( char * dst,
546	uint32_t * count)
547	{
548	*count = strlen( dst );
549	return 0;
550	}
551
552	////////////////////////////////////////////////
553	error_t process_load_init( process_t * process )
554	{
555	process_t * init;
556	dqdt_attr_t attr;
557	thread_t * main_thread;
558
559	struct vfs_file_s stdin;
560	struct vfs_file_s stdout;
561	struct vfs_file_s stderr;
562	struct ku_obj ku_path;
563
564	error_t err;
565	error_t err1;
566	error_t err2;
567	uint32_t isFatal;
568	char *environ[] = {"ALMOS_VERSION="CONFIG_ALMOS_VERSION, NULL};
569	char *argv[] = {INIT_PATH, "init", NULL};
570
571	printk(INFO, "INFO: Loading Init Process [ %s ]\n", INIT_PATH);
572
573	error = dqdt_process_placement(dqdt_root, &attr);
574	/* Force init to be on current cluster */
575	attr.cid_exec = current_cid;
576
577	assert(error == 0);
578
579	if((error = process_create(&init, &attr, CPU_USR_MODE)))
580	return err;
581
582	error = vmm_init(&init->vmm);
583
584	if(err) goto INIT_ERR;
585
586	error = pmm_init(&init->vmm.pmm, current_cluster);
587
588	if(err) goto INIT_ERR;
589
590	error = pmm_dup(&init->vmm.pmm, &process->vmm.pmm);
591
592	if(err) goto INIT_ERR;
593
594	vfs_file_up(&process->vfs_root);
595	init->vfs_root = process->vfs_root;
596
597	vfs_file_up(&process->vfs_root);
598	init->vfs_cwd = process->vfs_root;
599
600	init->vmm.limit_addr = CONFIG_USR_LIMIT;
601	init->uid = 0;
602	init->parent = process->pid;
603	atomic_init(&init->childs_nr, 0);
604	atomic_init(&process->childs_nr, 1);
605
606	list_add_last(&process->children, &init->list);
607
608	KK_BUFF(ku_path, ((void*) DEV_STDIN));
609	error = vfs_open(&init->vfs_cwd, &ku_path, VFS_O_RDONLY, 0, &stdin);
610	KK_BUFF(ku_path, ((void*) DEV_STDOUT));
611	err1 = vfs_open(&init->vfs_cwd, &ku_path, VFS_O_WRONLY, 0, &stdout);
612	KK_BUFF(ku_path, ((void*) DEV_STDERR));
613	err2 = vfs_open(&init->vfs_cwd, &ku_path, VFS_O_WRONLY, 0, &stderr);
614
615	if(error \|\| err1 \|\| err2)
616	{
617	if(!err) vfs_close(&stdin, NULL);
618	if(!err1) vfs_close(&stdout, NULL);
619	if(!err2) vfs_close(&stderr, NULL);
620
621	printk(ERROR,"ERROR: do_exec: cannot open fds [%d, %d, %d]\n", err, err1, err2);
622	error = ENOMEM;
623
624	goto INIT_ERR;
625	}
626
627	process_fd_set(init, 0, &stdin);
628	process_fd_set(init, 1, &stdout);
629	process_fd_set(init, 2, &stderr);
630
631	CURRENT_THREAD->info.attr.flags = PT_ATTR_AUTO_NXTT \| PT_ATTR_MEM_PRIO \| PT_ATTR_AUTO_MGRT;
632
633	error = full_do_exec(init, INIT_PATH, &argv[0], &environ[0], &isFatal,
634	&main_thread, kexec_copy, kexec_strlen);
635
636	if(error == 0)
637	{
638	assert(main_thread != NULL && (main_thread->signature == THREAD_ID));
639	init->state = TASK_READY;
640	error = sched_register(main_thread);
641	assert(error == 0); /* FIXME: ask DQDT for another core */
642
643	#if CONFIG_ENABLE_TASK_TRACE
644	main_thread->info.isTraced = true;
645	#endif
646	sched_add_created(main_thread);
647
648	printk(INFO, "INFO: Init Process Loaded [ %s ]\n", INIT_PATH);
649
650	return 0;
651	}
652
653	INIT_ERR:
654	process_destroy(init);
655	return err;
656	}

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