xref: /titanic_44/usr/src/cmd/sgs/librtld_db/common/rtld_db.c (revision 22872efb9462b28180d11ea401344608e641a5aa)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #pragma ident	"%Z%%M%	%I%	%E% SMI"
27 
28 
29 #include	<stdlib.h>
30 #include	<stdio.h>
31 #include	<string.h>
32 #include	<proc_service.h>
33 #include	<link.h>
34 #include	<rtld_db.h>
35 #include	<rtld.h>
36 #include	<_rtld_db.h>
37 #include	<msg.h>
38 #include	<sys/param.h>
39 
40 /*
41  * Mutex to protect global data
42  */
43 mutex_t	glob_mutex = DEFAULTMUTEX;
44 int	rtld_db_version = RD_VERSION1;
45 int	rtld_db_logging = 0;
46 char	rtld_db_helper_path[MAXPATHLEN];
47 
48 
49 void
rd_log(const int on_off)50 rd_log(const int on_off)
51 {
52 	(void) mutex_lock(&glob_mutex);
53 	rtld_db_logging = on_off;
54 	(void) mutex_unlock(&glob_mutex);
55 	LOG(ps_plog(MSG_ORIG(MSG_DB_LOGENABLE)));
56 }
57 
58 /*
59  * Versioning Notes.
60  *
61  * The following have been added as the versions of librtld_db
62  * have grown:
63  *
64  *	RD_VERSION1:
65  *		o baseline version
66  *
67  *	RD_VERSION2:
68  *		o added support for the use of the AT_SUN_LDBASE auxvector
69  *		  to find the initialial debugging (r_debug) structures
70  *		  in ld.so.1
71  *		o added the rl_dynamic field to rd_loadobj_t
72  *		o added the RD_FLG_MEM_OBJECT to be used with the
73  *		  rl_dynamic->rl_flags field.
74  *
75  *	RD_VERSION3:
76  *		o added the following fields/flags to the rd_plt_info_t
77  *		  type:
78  *			pi_baddr	- bound address of PLT (if bound)
79  *			pi_flags	- flag field
80  *			RD_FLG_PI_PLTBOUND	(flag for pi_flags)
81  *				if set - the PLT is bound and pi_baddr
82  *				is filled in with the destination of the PLT.
83  *
84  *	RD_VERSION4:
85  *		o added the following field to the rd_loadobj_t structure:
86  *			rl_tlsmodid	- module ID for TLS references
87  */
88 rd_err_e
rd_init(int version)89 rd_init(int version)
90 {
91 	if ((version < RD_VERSION1) ||
92 	    (version > RD_VERSION))
93 		return (RD_NOCAPAB);
94 	rtld_db_version = version;
95 	LOG(ps_plog(MSG_ORIG(MSG_DB_RDINIT), rtld_db_version));
96 
97 	return (RD_OK);
98 }
99 
100 rd_err_e
rd_ctl(int cmd,void * arg)101 rd_ctl(int cmd, void *arg)
102 {
103 	if (cmd != RD_CTL_SET_HELPPATH || arg == NULL ||
104 	    strlen((char *)arg) >= MAXPATHLEN)
105 		return (RD_ERR);
106 
107 	(void) strcpy(rtld_db_helper_path, (char *)arg);
108 
109 	return (RD_OK);
110 }
111 
112 rd_err_e
rd_get_dyns(rd_agent_t * rap,psaddr_t addr,void ** dynpp,size_t * dynpp_sz)113 rd_get_dyns(rd_agent_t *rap, psaddr_t addr, void **dynpp, size_t *dynpp_sz)
114 {
115 	if (rap->rd_helper.rh_ops != NULL)
116 		return (rap->rd_helper.rh_ops->rho_get_dyns(
117 		    rap->rd_helper.rh_data, addr, dynpp, dynpp_sz));
118 
119 #ifdef _LP64
120 	if (rap->rd_dmodel == PR_MODEL_LP64)
121 		return (_rd_get_dyns64(rap,
122 		    addr, (Elf64_Dyn **)dynpp, dynpp_sz));
123 	else
124 #endif
125 		return (_rd_get_dyns32(rap,
126 		    addr, (Dyn **)dynpp, dynpp_sz));
127 }
128 
129 rd_err_e
rd_reset(struct rd_agent * rap)130 rd_reset(struct rd_agent *rap)
131 {
132 	rd_err_e			err;
133 
134 	RDAGLOCK(rap);
135 
136 	rap->rd_flags = 0;
137 
138 #ifdef _LP64
139 	/*
140 	 * Determine if client is 32-bit or 64-bit.
141 	 */
142 	if (ps_pdmodel(rap->rd_psp, &rap->rd_dmodel) != PS_OK) {
143 		LOG(ps_plog(MSG_ORIG(MSG_DB_DMLOOKFAIL)));
144 		RDAGUNLOCK(rap);
145 		return (RD_DBERR);
146 	}
147 
148 	if (rap->rd_dmodel == PR_MODEL_LP64)
149 		err = _rd_reset64(rap);
150 	else
151 #endif
152 		err = _rd_reset32(rap);
153 
154 	RDAGUNLOCK(rap);
155 	return (err);
156 }
157 
158 
159 rd_agent_t *
rd_new(struct ps_prochandle * php)160 rd_new(struct ps_prochandle *php)
161 {
162 	rd_agent_t	*rap;
163 
164 	LOG(ps_plog(MSG_ORIG(MSG_DB_RDNEW), php));
165 	if ((rap = (rd_agent_t *)calloc(sizeof (rd_agent_t), 1)) == NULL)
166 		return (0);
167 
168 	rap->rd_psp = php;
169 	(void) mutex_init(&rap->rd_mutex, USYNC_THREAD, 0);
170 	if (rd_reset(rap) != RD_OK) {
171 		if (rap->rd_helper.rh_dlhandle != NULL) {
172 			rap->rd_helper.rh_ops->rho_fini(rap->rd_helper.rh_data);
173 			(void) dlclose(rap->rd_helper.rh_dlhandle);
174 		}
175 		free(rap);
176 		LOG(ps_plog(MSG_ORIG(MSG_DB_RESETFAIL)));
177 		return ((rd_agent_t *)0);
178 	}
179 
180 	return (rap);
181 }
182 
183 
184 void
rd_delete(rd_agent_t * rap)185 rd_delete(rd_agent_t *rap)
186 {
187 	LOG(ps_plog(MSG_ORIG(MSG_DB_RDDELETE), rap));
188 	if (rap->rd_helper.rh_dlhandle != NULL) {
189 		rap->rd_helper.rh_ops->rho_fini(rap->rd_helper.rh_data);
190 		(void) dlclose(rap->rd_helper.rh_dlhandle);
191 	}
192 	free(rap);
193 }
194 
195 
196 rd_err_e
rd_loadobj_iter(rd_agent_t * rap,rl_iter_f * cb,void * client_data)197 rd_loadobj_iter(rd_agent_t *rap, rl_iter_f *cb, void *client_data)
198 {
199 	rd_err_e	err;
200 
201 	RDAGLOCK(rap);
202 
203 #ifdef _LP64
204 	if (rap->rd_dmodel == PR_MODEL_LP64)
205 		err = _rd_loadobj_iter64(rap, cb, client_data);
206 	else
207 #endif
208 		err = _rd_loadobj_iter32(rap, cb, client_data);
209 
210 	RDAGUNLOCK(rap);
211 	return (err);
212 }
213 
214 
215 rd_err_e
rd_plt_resolution(rd_agent_t * rap,psaddr_t pc,lwpid_t lwpid,psaddr_t pltbase,rd_plt_info_t * rpi)216 rd_plt_resolution(rd_agent_t *rap, psaddr_t pc, lwpid_t lwpid,
217 	psaddr_t pltbase, rd_plt_info_t *rpi)
218 {
219 	rd_err_e	err;
220 	RDAGLOCK(rap);
221 #ifdef	_LP64
222 	if (rap->rd_dmodel == PR_MODEL_LP64)
223 		err = plt64_resolution(rap, pc, lwpid, pltbase,
224 		    rpi);
225 	else
226 #endif
227 		err = plt32_resolution(rap, pc, lwpid, pltbase,
228 		    rpi);
229 	RDAGUNLOCK(rap);
230 	return (err);
231 }
232 
233 rd_err_e
rd_event_addr(rd_agent_t * rap,rd_event_e num,rd_notify_t * np)234 rd_event_addr(rd_agent_t *rap, rd_event_e num, rd_notify_t *np)
235 {
236 	rd_err_e	rc = RD_OK;
237 
238 	RDAGLOCK(rap);
239 	switch (num) {
240 	case RD_NONE:
241 		break;
242 	case RD_PREINIT:
243 		np->type = RD_NOTIFY_BPT;
244 		np->u.bptaddr = rap->rd_preinit;
245 		break;
246 	case RD_POSTINIT:
247 		np->type = RD_NOTIFY_BPT;
248 		np->u.bptaddr = rap->rd_postinit;
249 		break;
250 	case RD_DLACTIVITY:
251 		np->type = RD_NOTIFY_BPT;
252 		np->u.bptaddr = rap->rd_dlact;
253 		break;
254 	default:
255 		LOG(ps_plog(MSG_ORIG(MSG_DB_UNEXPEVENT), num));
256 		rc = RD_ERR;
257 		break;
258 	}
259 	if (rc == RD_OK) {
260 		LOG(ps_plog(MSG_ORIG(MSG_DB_RDEVENTADDR), num,
261 		    EC_ADDR(np->u.bptaddr)));
262 	}
263 
264 	RDAGUNLOCK(rap);
265 	return (rc);
266 }
267 
268 
269 /* ARGSUSED 0 */
270 rd_err_e
rd_event_enable(rd_agent_t * rap,int onoff)271 rd_event_enable(rd_agent_t *rap, int onoff)
272 {
273 	rd_err_e	err;
274 
275 	RDAGLOCK(rap);
276 
277 #ifdef _LP64
278 	if (rap->rd_dmodel == PR_MODEL_LP64)
279 		err = _rd_event_enable64(rap, onoff);
280 	else
281 #endif
282 		err = _rd_event_enable32(rap, onoff);
283 
284 	RDAGUNLOCK(rap);
285 	return (err);
286 }
287 
288 
289 rd_err_e
rd_event_getmsg(rd_agent_t * rap,rd_event_msg_t * emsg)290 rd_event_getmsg(rd_agent_t *rap, rd_event_msg_t *emsg)
291 {
292 	rd_err_e	err;
293 
294 	RDAGLOCK(rap);
295 
296 #ifdef _LP64
297 	if (rap->rd_dmodel == PR_MODEL_LP64)
298 		err = _rd_event_getmsg64(rap, emsg);
299 	else
300 #endif
301 		err = _rd_event_getmsg32(rap, emsg);
302 
303 	RDAGUNLOCK(rap);
304 	return (err);
305 }
306 
307 
308 rd_err_e
rd_binder_exit_addr(struct rd_agent * rap,const char * bname,psaddr_t * beaddr)309 rd_binder_exit_addr(struct rd_agent *rap, const char *bname, psaddr_t *beaddr)
310 {
311 	ps_sym_t	sym;
312 
313 	if (rap->rd_tbinder) {
314 		*beaddr = rap->rd_tbinder;
315 		return (RD_OK);
316 	}
317 	if (ps_pglobal_sym(rap->rd_psp, PS_OBJ_LDSO, bname, &sym) != PS_OK) {
318 		LOG(ps_plog(MSG_ORIG(MSG_DB_UNFNDSYM),
319 		    bname));
320 		return (RD_ERR);
321 	}
322 
323 	rap->rd_tbinder = *beaddr = sym.st_value + sym.st_size - M_BIND_ADJ;
324 
325 	return (RD_OK);
326 }
327 
328 
329 rd_err_e
rd_objpad_enable(struct rd_agent * rap,size_t padsize)330 rd_objpad_enable(struct rd_agent *rap, size_t padsize)
331 {
332 	rd_err_e	err;
333 
334 	RDAGLOCK(rap);
335 
336 #ifdef _LP64
337 	if (rap->rd_dmodel == PR_MODEL_LP64)
338 		err = _rd_objpad_enable64(rap, padsize);
339 	else
340 #endif
341 		err = _rd_objpad_enable32(rap, padsize);
342 
343 	RDAGUNLOCK(rap);
344 	return (err);
345 }
346 
347 
348 char *
rd_errstr(rd_err_e rderr)349 rd_errstr(rd_err_e rderr)
350 {
351 	/*
352 	 * Convert an 'rd_err_e' to a string
353 	 */
354 	switch (rderr) {
355 	case RD_OK:
356 		return ((char *)MSG_ORIG(MSG_ER_OK));
357 	case RD_ERR:
358 		return ((char *)MSG_ORIG(MSG_ER_ERR));
359 	case RD_DBERR:
360 		return ((char *)MSG_ORIG(MSG_ER_DBERR));
361 	case RD_NOCAPAB:
362 		return ((char *)MSG_ORIG(MSG_ER_NOCAPAB));
363 	case RD_NODYNAM:
364 		return ((char *)MSG_ORIG(MSG_ER_NODYNAM));
365 	case RD_NOBASE:
366 		return ((char *)MSG_ORIG(MSG_ER_NOBASE));
367 	case RD_NOMAPS:
368 		return ((char *)MSG_ORIG(MSG_ER_NOMAPS));
369 	default:
370 		return ((char *)MSG_ORIG(MSG_ER_DEFAULT));
371 	}
372 }
373