summaryrefslogtreecommitdiff
path: root/sys/compat/mach/mach_exec.c
blob: fcafbcd4b6111c9b175f242e1ab7c5fe86ca896a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
/*	$NetBSD: mach_exec.c,v 1.52 2004/01/01 22:48:54 manu Exp $	 */

/*-
 * Copyright (c) 2001-2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas and Emmanuel Dreyfus.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mach_exec.c,v 1.52 2004/01/01 22:48:54 manu Exp $");

#include "opt_syscall_debug.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/exec.h>
#include <sys/queue.h>
#include <sys/exec_macho.h>
#include <sys/malloc.h>

#include <sys/syscall.h>

#include <uvm/uvm_extern.h>
#include <uvm/uvm_param.h>

#include <compat/mach/mach_types.h>
#include <compat/mach/mach_message.h>
#include <compat/mach/mach_port.h>
#include <compat/mach/mach_semaphore.h>
#include <compat/mach/mach_notify.h>
#include <compat/mach/mach_exec.h>

static int mach_cold = 1; /* Have we initialized COMPAT_MACH structures? */
static void mach_init(void);

extern struct sysent sysent[];
#ifdef SYSCALL_DEBUG
extern const char * const syscallnames[];
#endif
#ifndef __HAVE_SYSCALL_INTERN
void syscall(void);
#else
void mach_syscall_intern(struct proc *);
#endif

#if !defined(__HAVE_SIGINFO) || defined(COMPAT_16)
extern char sigcode[], esigcode[];
struct uvm_object *emul_mach_object;
#endif

const struct emul emul_mach = {
	"mach",
	"/emul/mach",
#ifndef __HAVE_MINIMAL_EMUL
	0,
	0,
	SYS_syscall,
	SYS_NSYSENT,
#endif
	sysent,
#ifdef SYSCALL_DEBUG
	syscallnames,
#else
	NULL,
#endif
	sendsig,
	mach_trapsignal,
	NULL,
#if !defined(__HAVE_SIGINFO) || defined(COMPAT_16)
	sigcode,
	esigcode,
	&emul_mach_object,
#else
	NULL,
	NULL,
	NULL,
#endif
	setregs,
	mach_e_proc_exec,
	mach_e_proc_fork,
	mach_e_proc_exit,
	mach_e_lwp_fork,
	mach_e_lwp_exit,
#ifdef __HAVE_SYSCALL_INTERN
	mach_syscall_intern,
#else
	syscall,
#endif
	NULL,
	NULL,
};

/*
 * Copy arguments onto the stack in the normal way, but add some
 * extra information in case of dynamic binding.
 * XXX This needs a cleanup: it is not used anymore by the Darwin 
 * emulation, and it probably contains Darwin specific bits. 
 */
int
exec_mach_copyargs(p, pack, arginfo, stackp, argp)
	struct proc *p;
	struct exec_package *pack;
	struct ps_strings *arginfo;
	char **stackp;
	void *argp;
{
	struct exec_macho_emul_arg *emea;
	struct exec_macho_object_header *macho_hdr;
	size_t len;
	size_t zero = 0;
	int error;
	
	*stackp = (char *)(((unsigned long)*stackp - 1) & ~0xfUL);

	emea = (struct exec_macho_emul_arg *)pack->ep_emul_arg;
	macho_hdr = (struct exec_macho_object_header *)emea->macho_hdr;
	if ((error = copyout(&macho_hdr, *stackp, sizeof(macho_hdr))) != 0) 
		return error;
	
	*stackp += sizeof(macho_hdr);

	if ((error = copyargs(p, pack, arginfo, stackp, argp)) != 0) {
		DPRINTF(("mach: copyargs failed\n"));
		return error;
	}

	if ((error = copyout(&zero, *stackp, sizeof(zero))) != 0)
		return error;
	*stackp += sizeof(zero);

	if ((error = copyoutstr(emea->filename, 
	    *stackp, MAXPATHLEN, &len)) != 0) {
		DPRINTF(("mach: copyout path failed\n"));
		return error;
	}
	*stackp += len + 1;

	/* We don't need this anymore */
	free(pack->ep_emul_arg, M_EXEC);
	pack->ep_emul_arg = NULL;

	len = len % sizeof(zero);
	if (len) {
		if ((error = copyout(&zero, *stackp, len)) != 0) 
			return error;
		*stackp += len;
	}

	if ((error = copyout(&zero, *stackp, sizeof(zero))) != 0) 
		return error;
	*stackp += sizeof(zero);

	return 0;
}

int
exec_mach_probe(path)
	char **path;
{
	*path = (char *)emul_mach.e_path;
	return 0;
}

void 
mach_e_proc_exec(p, epp)
	struct proc *p;
	struct exec_package *epp;
{
	mach_e_proc_init(p, p->p_vmspace);

	if (p->p_emul != epp->ep_es->es_emul)
		mach_e_lwp_fork(NULL, proc_representative_lwp(p));

	return;
}

void
mach_e_proc_fork(p, parent)
	struct proc *p;
	struct proc *parent;
{
	mach_e_proc_fork1(p, parent, 1);	
	return;
}

void 
mach_e_proc_fork1(p, parent, allocate)
	struct proc *p;
	struct proc *parent;
	int allocate;
{
	struct mach_emuldata *med1;
	struct mach_emuldata *med2;
	int i;

	/*
	 * For Darwin binaries, p->p_emuldata has already been
	 * allocated, no need to throw it away and allocate it again.
	 */
	if (allocate)
		p->p_emuldata = NULL;

	/* Use parent's vmspace because our vmspace may not be set up yet */
	mach_e_proc_init(p, parent->p_vmspace);

	med1 = p->p_emuldata;
	med2 = parent->p_emuldata;

	/* 
	 * Exception ports are inherited between forks,
	 * but we need to double their reference counts, 
	 * since the ports are referenced by rights in the
	 * parent and in the child.
	 *
	 * XXX we need to convert all the parent's rights
	 * to the child namespace. This will make the
	 * following fixup obsolete.
	 */
	for (i = 0; i <= MACH_EXC_MAX; i++) {
		med1->med_exc[i] = med2->med_exc[i];
		if (med1->med_exc[i] !=  NULL)
			med1->med_exc[i]->mp_refcount *= 2;
	}

	return;
}

void 
mach_e_proc_init(p, vmspace)
	struct proc *p;
	struct vmspace *vmspace;
{
	struct mach_emuldata *med;
	struct mach_right *mr;

	/* 
	 * Initialize various things if needed. 
	 * XXX Not the best place for this. 
	 */
	if (mach_cold == 1)
		mach_init();

	/*
	 * For Darwin binaries, p->p_emuldata is always allocated:
	 * from the previous program if it had the same emulation,
	 * or from darwin_e_proc_exec(). In the latter situation, 
	 * everything has been set to zero.
	 */
	if (!p->p_emuldata) {
#ifdef DIAGNOSTIC
		if (p->p_emul != &emul_mach)
			printf("mach_emuldata allocated for non Mach binary\n");
#endif
		p->p_emuldata = malloc(sizeof(struct mach_emuldata),
		    M_EMULDATA, M_WAITOK | M_ZERO);
	}

	med = (struct mach_emuldata *)p->p_emuldata;

	/*
	 * p->p_emudata has med_inited set if we inherited it from 
	 * the program that called exec(). In that situation, we
	 * must free anything that will not be used anymore.
	 */
	if (med->med_inited != 0) {
		lockmgr(&med->med_rightlock, LK_EXCLUSIVE, NULL);
		while ((mr = LIST_FIRST(&med->med_right)) != NULL)
			mach_right_put_exclocked(mr, MACH_PORT_TYPE_ALL_RIGHTS);
		lockmgr(&med->med_rightlock, LK_RELEASE, NULL);

		/*
		 * Do not touch special ports. Some other process (eg: gdb)
		 * might have grabbed them to control the process, and the
		 * controller intend to keep in control even after exec().
		 */
	} else {
		/* 
		 * p->p_emuldata is uninitialized. Go ahead and initialize it.
		 */
		LIST_INIT(&med->med_right);
		lockinit(&med->med_rightlock, PZERO|PCATCH, "mach_right", 0, 0);
		lockinit(&med->med_exclock, PZERO, "exclock", 0, 0);

		/* 
		 * For debugging purpose, it's convenient to have each process 
		 * using distinct port names, so we prefix the first port name
		 * by the PID. Darwin does not do that, but we can remove it 
		 * when we want, it will not hurt.
		 */
		med->med_nextright = p->p_pid << 16;

		/*
		 * Initialize special ports. Bootstrap port is shared
		 * among all Mach processes in our implementation.
		 */
		med->med_kernel = mach_port_get();
		med->med_host = mach_port_get();

		med->med_kernel->mp_flags |= MACH_MP_INKERNEL;
		med->med_host->mp_flags |= MACH_MP_INKERNEL;

		med->med_kernel->mp_data = (void *)p;
		med->med_host->mp_data = (void *)p;

		med->med_kernel->mp_datatype = MACH_MP_PROC;
		med->med_host->mp_datatype = MACH_MP_PROC;

		MACH_PORT_REF(med->med_kernel);
		MACH_PORT_REF(med->med_host);

		med->med_bootstrap = mach_bootstrap_port;
		MACH_PORT_REF(med->med_bootstrap);
	}

	/* 
	 * Exception ports are inherited accross exec() calls.
	 * If the structure is initialized, the ports are just 
	 * here, so leave them untouched. If the structure is
	 * uninitalized, the ports are all set to zero, which 
	 * is the default, so do not touch them either.
	 */

	med->med_dirty_thid = 1;
	med->med_suspend = 0;
	med->med_inited = 1;

	return;
}

void 
mach_e_proc_exit(p)
	struct proc *p;
{
	struct mach_emuldata *med;
	struct mach_right *mr;
	int i;

	/* There is only one lwp remaining... */
	mach_e_lwp_exit(proc_representative_lwp(p));

	med = (struct mach_emuldata *)p->p_emuldata;

	lockmgr(&med->med_rightlock, LK_EXCLUSIVE, NULL);
	while ((mr = LIST_FIRST(&med->med_right)) != NULL)
		mach_right_put_exclocked(mr, MACH_PORT_TYPE_ALL_RIGHTS);
	lockmgr(&med->med_rightlock, LK_RELEASE, NULL);

	MACH_PORT_UNREF(med->med_bootstrap);

	/*
	 * If the lock on this task exception handler is held,
	 * release it now as it will never be released by the
	 * exception handler.
	 */
	if (lockstatus(&med->med_exclock) != 0)
		wakeup(&med->med_exclock);

	/* 
	 * If the kernel and host port are still referenced, remove
	 * the pointer to this process' struct proc, as it will 
	 * become invalid once the process will exit.
	 */
	med->med_kernel->mp_datatype = MACH_MP_NONE;
	med->med_kernel->mp_data = NULL;
	MACH_PORT_UNREF(med->med_kernel);

	med->med_host->mp_datatype = MACH_MP_NONE;
	med->med_host->mp_data = NULL;
	MACH_PORT_UNREF(med->med_host);

	for (i = 0; i <= MACH_EXC_MAX; i++)
		if (med->med_exc[i] != NULL)
			MACH_PORT_UNREF(med->med_exc[i]);

	free(med, M_EMULDATA);
	p->p_emuldata = NULL;

	return;
}

void
mach_e_lwp_fork(l1, l2)
	struct lwp *l1;
	struct lwp *l2;
{
	struct mach_lwp_emuldata *mle;

	mle = malloc(sizeof(*mle), M_EMULDATA, M_WAITOK);
	l2->l_emuldata = mle;

	mle->mle_kernel = mach_port_get();
	MACH_PORT_REF(mle->mle_kernel);

	mle->mle_kernel->mp_flags |= MACH_MP_INKERNEL;
	mle->mle_kernel->mp_datatype = MACH_MP_LWP;
	mle->mle_kernel->mp_data = (void *)l2;

#if 0
	/* Nothing to copy from parent thread for now */
	if (l1 != NULL);
#endif

	return;
}

void
mach_e_lwp_exit(l)
	struct lwp *l;
{
	struct mach_lwp_emuldata *mle;

	mach_semaphore_cleanup(l);

#ifdef DIAGNOSTIC
	if (l->l_emuldata == NULL) {
		printf("lwp_emuldata already freed\n");
		return;
	}
#endif
	mle = l->l_emuldata;

	mle->mle_kernel->mp_data = NULL;
	mle->mle_kernel->mp_datatype = MACH_MP_NONE;
	MACH_PORT_UNREF(mle->mle_kernel);

	free(mle, M_EMULDATA);
	l->l_emuldata = NULL;

	return;
}

static void
mach_init(void)
{
	mach_semaphore_init();
	mach_message_init();
	mach_port_init();

	mach_cold = 0;

	return;
}