xref: /illumos-gate/usr/src/cmd/sgs/rtld/common/_rtld.h (revision fec04708)
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 /*
23  *	Copyright (c) 1988 AT&T
24  *	  All Rights Reserved
25  *
26  * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
27  */
28 /*
29  * Copyright (c) 2012, Joyent, Inc.  All rights reserved.
30  */
31 #ifndef	__RTLD_H
32 #define	__RTLD_H
33 
34 /*
35  * Common header for run-time linker.
36  */
37 #include <sys/types.h>
38 #include <sys/stat.h>
39 #include <sys/avl.h>
40 #include <sys/mman.h>
41 #include <stdarg.h>
42 #include <synch.h>
43 #include <signal.h>
44 #include <errno.h>
45 #include <unistd.h>
46 #include <link.h>
47 #include <rtld.h>
48 #include <sgs.h>
49 #include <machdep.h>
50 #include <rtc.h>
51 #include <debug.h>
52 #include <msg.h>
53 #include <libc_int.h>
54 
55 #ifdef	__cplusplus
56 extern "C" {
57 #endif
58 
59 /*
60  * Dependency search rule order.
61  */
62 #define	RPLENV		1		/* replaceable LD_LIBRARY_PATH */
63 #define	PRMENV		2		/* permanent LD_LIBRARY_PATH */
64 #define	RUNPATH		3		/* callers runpath */
65 #define	DEFAULT		4		/* default library path */
66 
67 typedef struct fdesc	Fdesc;
68 typedef struct fct	Fct;
69 typedef	struct pdesc	Pdesc;
70 
71 /*
72  * Data structure for file class specific functions and data.
73  */
74 struct fct {
75 	/* Verify that the object is of this class. */
76 	Fct	*(*fct_verify_file)(caddr_t, size_t, Fdesc *, const char *,
77 	    Rej_desc *);
78 
79 	/* Generate a link-map to describe the loaded object. */
80 	Rt_map	*(*fct_new_lmp)(Lm_list *, Aliste, Fdesc *, Addr, size_t,
81 	    void *, Rt_map *, int *);
82 
83 	/* Retrieve the entry point of the object. */
84 	Addr	(*fct_entry_pt)(void);
85 
86 	/* Determine the objects dependencies (needed entries). */
87 	int	(*fct_needed)(Lm_list *, Aliste, Rt_map *, int *);
88 
89 	/* Look up a symbol for the object. */
90 	int	(*fct_lookup_sym)(Slookup *, Sresult *, uint_t *, int *);
91 
92 	/* Relocate the object. */
93 	int	(*fct_reloc)(Rt_map *, uint_t, int *, APlist **);
94 
95 	/* List of default directories to search for dependencies. */
96 	Alist	**(*fct_get_def_dirs)(void);
97 
98 	/* List of secure directories to search for dependencies. */
99 	Alist	**(*fct_get_sec_dirs)(void);
100 
101 	/* Transpose the name of the object. */
102 	int	(*fct_fix_name)(const char *, Rt_map *, Alist **, Aliste,
103 	    uint_t);
104 
105 	/* Get a shared object name */
106 	char	*(*fct_get_so)(const char *, const char *, size_t, size_t);
107 
108 	/* Retrieve a symbolic address from the object. */
109 	void	(*fct_dladdr)(ulong_t, Rt_map *, Dl_info *, void **, int);
110 
111 	/* Process a dlsym(3c) request within the object. */
112 	int	(*fct_dlsym)(Grp_hdl *, Slookup *, Sresult *, uint_t *, int *);
113 };
114 
115 /*
116  * Macros for getting to the file class table.
117  */
118 #define	LM_ENTRY_PT(X)		((X)->rt_fct->fct_entry_pt)
119 #define	LM_NEEDED(X)		((X)->rt_fct->fct_needed)
120 #define	LM_LOOKUP_SYM(X)	((X)->rt_fct->fct_lookup_sym)
121 #define	LM_RELOC(X)		((X)->rt_fct->fct_reloc)
122 #define	LM_DEFAULT_DIRS(X)	((X)->rt_fct->fct_get_def_dirs)
123 #define	LM_SECURE_DIRS(X)	((X)->rt_fct->fct_get_sec_dirs)
124 #define	LM_FIX_NAME(X)		((X)->rt_fct->fct_fix_name)
125 #define	LM_GET_SO(X)		((X)->rt_fct->fct_get_so)
126 #define	LM_DLADDR(X)		((X)->rt_fct->fct_dladdr)
127 #define	LM_DLSYM(X)		((X)->rt_fct->fct_dlsym)
128 
129 /*
130  * Initial memory map allocation.  Typical ELF objects contain a text and data
131  * segment, which can be augmented with a bss mapping.  Add a bunch more for
132  * luck.
133  */
134 #define	MMAPFD_NUM	10
135 
136 /*
137  * Define Alist initialization counts.
138  */
139 #define	AL_CNT_ALIAS	2		/* ALIAS() */
140 #define	AL_CNT_DEPENDS	20		/* DEPENDS() */
141 #define	AL_CNT_CALLERS	20		/* CALLERS() */
142 #define	AL_CNT_GROUPS	20		/* GROUPS() */
143 #define	AL_CNT_COPYREL	10		/* COPY() */
144 #define	AL_CNT_LAZYFIND	10		/* elf_lazy_find_sym() */
145 #define	AL_CNT_GRPCLCT	10		/* gdp_collect() */
146 #define	AL_CNT_DEPCLCT	10		/* load_finish() */
147 #define	AL_CNT_RTLDINFO	1		/* RTLDINFO() */
148 #define	AL_CNT_FPNODE	4		/* FPNODE() */
149 #define	AL_CNT_LMLISTS	20		/* lm_lists */
150 #define	AL_CNT_LMNOW	8		/* lm_now */
151 #define	AL_CNT_RELBIND	20		/* relocation binding */
152 #define	AL_CNT_ACTAUDIT	2		/* lm_actaudit */
153 #define	AL_CNT_MOVES	10		/* move_data */
154 #define	AL_CNT_MPOBJS	4		/* elf_obj_file() */
155 #define	AL_CNT_TEXTREL	2		/* text relocation segment */
156 #define	AL_CNT_NEEDED	1		/* dependency path */
157 #define	AL_CNT_SEARCH	4		/* search path */
158 #define	AL_CNT_FILTEES	2		/* filtee path */
159 #define	AL_CNT_HANDLES	1		/* hdl_list[] */
160 #define	AL_CNT_FREELIST	80		/* free_alp */
161 #define	AL_CNT_CAP	10		/* capabilities candidate */
162 #define	AL_CNT_SPATH	4		/* search path */
163 #define	AL_CNT_DYNLIST	2		/* dynlm_list */
164 #define	AL_CNT_PENDING	2		/* pending tsort list (INITFIRST) */
165 #define	AL_CNT_PLTPAD	10		/* plt padding */
166 #define	AL_CNT_AUDITORS	2		/* auditing list */
167 #define	AL_CNT_ENVIRON	20		/* environment list (enough for ldd) */
168 #define	AL_CNT_COOKIES	2		/* head link-map list cookies */
169 
170 /*
171  * Size of buffer for building error messages.
172  */
173 #define	ERRSIZE		2048		/* MAXPATHLEN * 2 */
174 
175 /*
176  * Configuration file information.
177  */
178 typedef struct config {
179 	const char	*c_name;
180 	Addr		c_bgn;
181 	Addr		c_end;
182 	Word		*c_hashtbl;
183 	Word		*c_hashchain;
184 	const char	*c_strtbl;
185 	Rtc_obj		*c_objtbl;
186 	Rtc_fltr	*c_fltr;
187 	Rtc_flte	*c_flte;
188 } Config;
189 
190 /*
191  * Register symbol list.
192  */
193 typedef struct reglist {
194 	Rt_map		*rl_lmp;	/* defining object */
195 	Sym		*rl_sym;	/* regsym */
196 	struct reglist	*rl_next;	/* next entry */
197 } Reglist;
198 
199 /*
200  * Data structure to hold interpreter information.
201  */
202 typedef struct interp {
203 	char		*i_name;	/* interpreter name */
204 	caddr_t		i_faddr;	/* address interpreter is mapped at */
205 } Interp;
206 
207 /*
208  * Data structure used to keep track of copy relocations.  These relocations
209  * are collected during initial relocation processing and maintained on the
210  * COPY(lmp) list of the defining object.  Each copy list is also added to the
211  * COPY(lmp) of the head object (normally the application dynamic executable)
212  * from which they will be processed after all relocations are done.
213  *
214  * The use of RTLD_GROUP will also reference individual objects COPY(lmp) lists
215  * in case a bound symbol must be assigned to it actual copy relocation.
216  */
217 typedef struct {
218 	const char	*r_name;	/* symbol name */
219 	Sym		*r_rsym;	/* reference symbol table entry */
220 	Rt_map		*r_rlmp;	/* reference link map */
221 	Rt_map		*r_dlmp;	/* definition link map */
222 	Sym		*r_dsym;	/* definition symbol table entry */
223 	void		*r_radd;	/* copy to address */
224 	const void	*r_dadd;	/* copy from address */
225 	ulong_t		r_size;		/* copy size bytes */
226 } Rel_copy;
227 
228 /*
229  * Define a file descriptor, which maintains information regarding a pathname
230  * that has been opened and minimally inspected.
231  */
232 struct fdesc {
233 	Rt_map		*fd_lmp;	/* existing link-map pointer */
234 	Lm_list		*fd_lml;	/* callers link-map list */
235 	Fct		*fd_ftp;	/* file functions pointer */
236 	const char	*fd_oname;	/* original file name */
237 	const char	*fd_odir;	/* original directory name */
238 	const char	*fd_nname;	/* new file (expanded) name */
239 	const char	*fd_pname;	/* new path (resolved) name */
240 	dev_t		fd_dev;		/* file device number */
241 	rtld_ino_t	fd_ino;		/* file inode number */
242 	avl_index_t	fd_avlwhere;	/* avl tree insertion index */
243 	Syscapset	fd_scapset;	/* capabilities */
244 	mmapobj_result_t *fd_mapp;	/* mapping pointer */
245 	uint_t		fd_mapn;	/* mapping number */
246 	uint_t		fd_flags;
247 };
248 
249 #define	FLG_FD_ALTER	0x0001		/* file is an alternate */
250 #define	FLG_FD_SLASH	0x0002		/* file contains a "/" */
251 #define	FLG_FD_RESOLVED	0x0004		/* fd_nname has been resolved */
252 #define	FLG_FD_ALTCHECK	0x0008		/* alternative system capabilities */
253 					/*	checked */
254 #define	FLG_FD_ALTCAP	0x0010		/* alternative system capabilities */
255 					/*	should be used */
256 #define	FLG_FD_IGNORE	0x0020		/* descriptor should be ignored */
257 
258 /*
259  * File descriptor availability flag.
260  */
261 #define	FD_UNAVAIL	-1
262 
263 /*
264  * Disabled filter flag.  Filter objects are referenced using their .dynamic
265  * index (DT_FILTER or DT_AUXILIARY).  This index is saved and used to lookup
266  * the required filter.  Note that 0 is a valid .dynamic index.  The caller's
267  * OBJFLTRNDX() element is initialized using the following flag, and should
268  * the filter's initialization fail, is reset to this value to indicate the
269  * filter is disabled.  UINT_MAX provides a convenient invalid .dynamic index.
270  */
271 #define	FLTR_DISABLED	UINT_MAX
272 
273 /*
274  * Status flags for rtld_flags
275  */
276 #define	RT_FL_THREADS	0x00000001	/* threads are enabled */
277 #define	RT_FL_WARNFLTR	0x00000002	/* warn of missing filtees (ldd) */
278 #define	RT_FL_DBNOTIF	0x00000004	/* binding activity going on */
279 #define	RT_FL_DEFERRED	0x00000008	/* load deferred dependencies (ldd) */
280 #define	RT_FL_NOBIND	0x00000010	/* don't carry out plt binding */
281 #define	RT_FL_NOVERSION	0x00000020	/* disable version checking */
282 #define	RT_FL_SECURE	0x00000040	/* setuid/segid flag */
283 #define	RT_FL_APPLIC	0x00000080	/* executing application code */
284 #define	RT_FL_NOENVIRON	0x00000100	/* don't process environment */
285 					/*	variables (ld.so.1 -e) */
286 #define	RT_FL_CONFGEN	0x00000200	/* don't relocate initiating object */
287 					/*	set by crle(1) */
288 #define	RT_FL_CONFAPP	0x00000400	/* application specific configuration */
289 					/*	cache required */
290 #define	RT_FL_DEBUGGER	0x00000800	/* a debugger is monitoring us */
291 #define	RT_FL_OPERATION	0x00001000	/* start recording operations */
292 #define	RT_FL_NEWLOCALE	0x00002000	/* message locale has changed */
293 #define	RT_FL_NOBAPLT	0x00004000	/* sparc: don't use ba plt's */
294 #define	RT_FL_NOAUXFLTR	0x00008000	/* disable auxiliary filters */
295 
296 #define	RT_FL_NOAUDIT	0x00020000	/* disable auditing */
297 #define	RT_FL_ATEXIT	0x00040000	/* we're shutting down */
298 #define	RT_FL_SILENCERR	0x00080000	/* silence error messages */
299 
300 #define	RT_FL_INITFIRST	0x00200000	/* processing a DT_INITFIRST object */
301 
302 #define	RT_FL_DEMANGLE	0x01000000	/* demangle C++ symbol names */
303 #define	RT_FL_NOCFG	0x02000000	/* disable config file use */
304 #define	RT_FL_NODIRCFG	0x04000000	/* disable directory config use */
305 #define	RT_FL_NOOBJALT	0x08000000	/* disable object alternative use */
306 #define	RT_FL_NOENVCFG	0x10000000	/* disable config envars use */
307 #define	RT_FL_DIRCFG	0x20000000	/* directory config info available */
308 #define	RT_FL_OBJALT	0x40000000	/* object alternatives are available */
309 #define	RT_FL_MEMRESV	0x80000000	/* memory reservation established */
310 
311 /*
312  * Status flags for rtld_flags2
313  */
314 #define	RT_FL2_HASAUDIT	0x00000001	/* auditing lm_list is present */
315 #define	RT_FL2_RTLDSEEN	0x00000002	/* rtldinfo has been set */
316 #define	RT_FL2_UNIFPROC	0x00000004	/* libc/libthread unified environment */
317 
318 #define	RT_FL2_NOFLTCFG	0x00000010	/* disable config filter use */
319 #define	RT_FL2_FLTCFG	0x00000020	/* filter config info available */
320 #define	RT_FL2_HWCAP	0x00000040	/* hardware capabilities available */
321 #define	RT_FL2_FTL2WARN	0x00000080	/* convert fatal to warning messages */
322 #define	RT_FL2_BINDNOW	0x00000100	/* LD_BIND_NOW in effect */
323 #define	RT_FL2_BINDLAZY	0x00000200	/* disable RTLD_NOW (and LD_BIND_NOW) */
324 #define	RT_FL2_PLMSETUP	0x00000400	/* primary link-map set up complete */
325 #define	RT_FL2_BRANDED	0x00000800	/* process is branded */
326 #define	RT_FL2_NOPLM	0x00001000	/* process has no primary link map */
327 #define	RT_FL2_SETUID	0x00002000	/* ld.so.1 is setuid root */
328 #define	RT_FL2_ADDR32	0x00004000	/* 32-bit address space requirement */
329 
330 /*
331  * Information flags for env_info.
332  */
333 #define	ENV_INF_PATHCFG	0x00000001	/* replaceable LD_LIBRARY_PATH */
334 					/*	originates from configuration */
335 					/*	file */
336 #define	ENV_INF_FLAGCFG	0x00000002	/* replaceable LD_FLAGS originates */
337 					/*	from configuration file */
338 
339 /*
340  * RTLDINFO descriptor.
341  */
342 typedef struct {
343 	Rt_map		*rti_lmp;	/* RTLDINFO provider */
344 	Lc_interface	*rti_info;	/* RTLDINFO data */
345 } Rti_desc;
346 
347 /*
348  * Binding flags for the rt_bind_guard()/rt_bind_clear() routines.
349  * These are defined in usr/src/lib/libc/inc/libc_int.h in the
350  * latest version of the libc/rtld runtime interface (CI_V_FIVE).
351  */
352 #if !defined(CI_V_FIVE)
353 #define	THR_FLG_RTLD	0x00000001	/* rtldlock bind guard flag */
354 #define	THR_FLG_NOLOCK	0x00000000	/* no-op before CI_V_FIVE */
355 #define	THR_FLG_REENTER	0x00000000	/* no-op before CI_V_FIVE */
356 #endif
357 
358 #define	ROUND(x, a)	(((int)(x) + ((int)(a) - 1)) & ~((int)(a) - 1))
359 
360 /*
361  * Print buffer.
362  */
363 typedef struct {
364 	char	*pr_buf;	/* pointer to beginning of buffer */
365 	char	*pr_cur;	/* pointer to next free char in buffer */
366 	size_t	pr_len;		/* buffer size */
367 	int	pr_fd;		/* output fd */
368 } Prfbuf;
369 
370 /*
371  * Path name descriptor.  Used to construct various path names such as search
372  * paths, dependency paths, filter paths etc.  The pd_info element can be used
373  * to hold various pointers, like Grp_hdl, Rtc_obj, etc.
374  */
375 struct pdesc {
376 	const char	*pd_pname;	/* path name - may be expanded */
377 	const char	*pd_oname;	/* original name - unexpanded */
378 	void		*pd_info;	/* possible auxiliary information */
379 	size_t		pd_plen;	/* path name length */
380 	uint_t		pd_flags;	/* descriptor specific flags */
381 };
382 
383 /*
384  * Path name descriptors are passed to expand_path() and expand().  These
385  * routines break down possible multiple path strings (separated with ":"),
386  * and perform any reserved token expansion.  These routines are passed
387  * information that indicates the use of the path, for example, search paths,
388  * i.e., LD_LIBRARY_PATH, RPATHS, etc. are defined using la_objsearch()
389  * information (see LA_SER flags in link.h).  This information is recorded in
390  * the pd_flags field for later use.
391  *
392  * Define expansion path tokens.  These are used to prevent various expansions
393  * from occurring, and record those expansions that do.  Any expansion
394  * information is also recorded in the pd_flags field, and thus is or'd
395  * together with any LA_SER flags.
396  */
397 #define	PD_TKN_ORIGIN	0x00001000	/* $ORIGIN expansion has occurred */
398 #define	PD_TKN_PLATFORM	0x00002000	/* $PLATFORM expansion has occurred */
399 #define	PD_TKN_OSNAME	0x00004000	/* $OSNAME expansion has occurred */
400 #define	PD_TKN_OSREL	0x00008000	/* $OSREL expansion has occurred */
401 #define	PD_TKN_ISALIST	0x00010000	/* $ISALIST expansion has occurred */
402 #define	PD_TKN_CAP	0x00020000	/* $CAPABILITY/$HWCAP expansion has */
403 					/*	occurred */
404 #define	PD_TKN_MACHINE	0x00040000	/* $MACHINE expansion has occurred */
405 #define	PD_TKN_RESOLVED	0x00080000	/* resolvepath() expansion has */
406 					/*	occurred */
407 #define	PD_MSK_EXPAND	0x000ff000	/* mask for all expansions */
408 
409 /*
410  * Define additional path information.  These definitions extend the path
411  * information, and may be passed into expand_path(), or set internally, or
412  * inherited from expand().  These definitions are or'd together with any
413  * LA_SER_ flags and PD_TKN_ flags.
414  */
415 #define	PD_FLG_PNSLASH	0x00100000	/* pd_pname contains a slash */
416 #define	PD_FLG_DUPLICAT	0x00200000	/* path is a duplicate */
417 #define	PD_FLG_EXTLOAD	0x00400000	/* path defines extra loaded objects */
418 					/*	(preload, audit etc.) */
419 #define	PD_FLG_UNIQUE	0x00800000	/* ensure path is unique */
420 #define	PD_FLG_USED	0x01000000	/* indicate that path is used */
421 #define	PD_FLG_FULLPATH	0x02000000	/* ensure path is a full path */
422 
423 #define	PD_MSK_INHERIT	0x0ffff000	/* mask for pd_flags incorporation */
424 
425 /*
426  * Additional token expansion information.  Although these flags may be set
427  * within a token data item return from expand(), they are masked off with
428  * PD_MSK_INHERIT prior to any expansion information being recorded in a path
429  * name descriptor for later diagnostics.
430  */
431 #define	TKN_NONE	0x00000001	/* no token expansion has occurred */
432 #define	TKN_DOTSLASH	0x00000002	/* path contains a "./" */
433 
434 /*
435  * dlopen() handle list size.
436  */
437 #define	HDLIST_SZ	101	/* prime no. for hashing */
438 #define	HDLIST_ORP	102	/* orphan handle list */
439 
440 /*
441  * Define a path name search descriptor.  This "cookie" maintains state as
442  * search paths are processed with get_next_dir().  Note, the path list is an
443  * indirect pointer, as search paths can be reevaluated for secure applications
444  * to provide better error diagnostics.
445  */
446 typedef struct {
447 	uchar_t		*sp_rule;	/* present search rule */
448 	Alist		**sp_dalpp;	/* present path list within rule */
449 	Aliste		sp_idx;		/* present index within path list */
450 } Spath_desc;
451 
452 /*
453  * Define a path name definition descriptor.  Used to maintain initial path
454  * name definitions.
455  */
456 typedef struct {
457 	const char	*sd_name;	/* path name */
458 	size_t		sd_len;		/* path name size */
459 } Spath_defn;
460 
461 /*
462  * Define _caller flags.
463  */
464 #define	CL_NONE		0
465 #define	CL_EXECDEF	1		/* supply the executable as a default */
466 					/* if the caller can't be determined */
467 
468 /*
469  * Binding information flags.  These flags are passed up from low level binding
470  * routines to indicate "additional" information, such as why a binding has been
471  * rejected.  These flags use the same data element as is used to record any
472  * DBG_BINFO flags.  The DBG_BINFO flags are used to define the final bindings
473  * information and are used to provide better binding diagnostics.
474  */
475 #define	BINFO_REJDIRECT		0x010000	/* reject a direct binding */
476 #define	BINFO_REJSINGLE		0x100000	/* reject a singleton binding */
477 #define	BINFO_REJGROUP		0x200000	/* reject a group binding */
478 
479 #define	BINFO_MSK_TRYAGAIN	0xf00000	/* a mask of bindings that */
480 						/*    should be retried */
481 #define	BINFO_MSK_REJECTED	0xff0000	/* a mask of bindings that */
482 						/*    have been rejected */
483 
484 /*
485  * The 32-bit version of rtld uses special stat() wrapper functions
486  * that preserve the non-largefile semantics of stat()/fstat() while
487  * allowing for large inode values. The 64-bit rtld uses stat() directly.
488  */
489 #ifdef _LP64
490 #define	rtld_fstat	fstat
491 #define	rtld_stat	stat
492 typedef	struct stat	rtld_stat_t;
493 #else
494 typedef struct {
495 	dev_t		st_dev;
496 	rtld_ino_t	st_ino;
497 	mode_t		st_mode;
498 	uid_t		st_uid;
499 	off_t		st_size;
500 	timestruc_t	st_mtim;
501 #ifdef sparc
502 	blksize_t	st_blksize;
503 #endif
504 } rtld_stat_t;
505 #endif
506 
507 /*
508  * Some capabilities aux vector definitions have been removed over time.
509  * However, existing objects may define these capabilities.  Establish
510  * capability masks that provide for deleting any removed capabilities, so
511  * that these capabilities are not used to validate the associated object.
512  *
513  * These masks are tightly coupled to the aux vector definitions in auxv_386.h
514  * and auxv_SPARC.h, however they are maintained here, as only ld.so.1 needs
515  * to remove these capabilities.  These definitions also describe where the
516  * flags are associated and allow for providing multi-architecture definitions
517  * should they become necessary, without having to pollute global header files.
518  */
519 #if	defined(__x86)
520 #define	AV_HW1_IGNORE	(0x8000 | 0x2000)	/* withdrawn MON and PAUSE */
521 #else						/*    auxv_386.h flags */
522 #define	AV_HW1_IGNORE	0
523 #endif
524 
525 /*
526  * Error messages generated by ld.so.1 can be written to two different places.
527  * During initial startup, messages are flushed to the stderr.  Once ld.so.1
528  * has jumped to the application, messages are stored in an internal buffer for
529  * retrieval by dlerror().  Between these two conditions, events such as libc's
530  * callbacks, and calls to auditors, are effectively jumping to application
531  * code.  These transitions from application code to ld.so.1 code are guarded by
532  * the following macros to ensure any error messages are directed to the
533  * appropriate output.  The single argument, "f", is a local variable that
534  * can retain, and reinstate, the RT_FL_APPLIC flag of the global rtld_flags
535  * variable.
536  */
537 #define	APPLICATION_ENTER(f) \
538 	f = (rtld_flags & RT_FL_APPLIC) ? 0 : RT_FL_APPLIC; \
539 	rtld_flags |= f;
540 #define	APPLICATION_RETURN(f) \
541 	rtld_flags &= ~f;
542 
543 /*
544  * Data declarations.
545  */
546 extern Lc_desc		glcs[];		/* global external interfaces */
547 
548 extern	Rt_lock		rtldlock;	/* rtld lock */
549 extern	int		thr_flg_nolock;
550 extern	int		thr_flg_reenter;
551 
552 extern APlist		*dynlm_list;	/* dynamic list of link-maps */
553 extern char		**environ;	/* environ pointer */
554 
555 extern int		dyn_plt_ent_size; /* Size of dynamic plt's */
556 extern ulong_t		at_flags;	/* machine specific file flags */
557 extern const char	*procname;	/* file name of executing process */
558 extern Rtld_db_priv	r_debug;	/* debugging information */
559 extern char		*lasterr;	/* string describing last error */
560 extern Interp		*interp;	/* ELF executable interpreter info */
561 extern const char	*rtldname;	/* name of the dynamic linker */
562 extern APlist		*hdl_alp[];	/* dlopen() handle list */
563 extern size_t		syspagsz;	/* system page size */
564 extern Isa_desc		*isa;		/* isalist descriptor */
565 extern Uts_desc		*uts;		/* utsname descriptor */
566 extern uint_t		rtld_flags;	/* status flags for RTLD */
567 extern uint_t		rtld_flags2;	/* additional status flags for RTLD */
568 extern uint32_t		pltcnt21d;	/* cnt of 21d PLTs */
569 extern uint32_t		pltcnt24d;	/* cnt of 24d PLTs */
570 extern uint32_t		pltcntu32;	/* cnt of u32 PLTs */
571 extern uint32_t		pltcntu44;	/* cnt of u44 PLTs */
572 extern uint32_t		pltcntfull;	/* cnt of full PLTs */
573 extern uint32_t		pltcntfar;	/* cnt of far PLTs */
574 extern uchar_t		search_rules[];	/* dependency search rules */
575 
576 extern Fct		elf_fct;	/* ELF file class dependent data */
577 
578 extern Config		*config;		/* configuration structure */
579 extern const char	*locale;		/* locale environment setting */
580 
581 extern const char	*rpl_audit;	/* replaceable LD_AUDIT string */
582 extern const char	*rpl_debug;	/* replaceable LD_DEBUG string */
583 extern const char	*rpl_ldflags;	/* replaceable LD_FLAGS string */
584 extern const char	*rpl_libpath;	/* replaceable LD_LIBRARY string */
585 extern Alist		*rpl_libdirs;	/*	and its associated Pdesc list */
586 extern const char	*rpl_preload;	/* replaceable LD_PRELOAD string */
587 
588 extern const char	*prm_audit;	/* permanent LD_AUDIT string */
589 extern const char	*prm_debug;	/* permanent LD_DEBUG string */
590 extern const char	*prm_ldflags;	/* permanent LD_FLAGS string */
591 extern const char	*prm_libpath;	/* permanent LD_LIBRARY string */
592 extern Alist		*prm_libdirs;	/*	and its associated Pdesc list */
593 extern const char	*prm_preload;	/* permanent LD_PRELOAD string */
594 
595 extern Alist		*elf_def_dirs;	/* ELF default directory seach paths */
596 extern Alist		*elf_sec_dirs;	/* ELF secure directory seach paths */
597 
598 extern uint_t		env_info;	/* information regarding environment */
599 					/*	variables */
600 extern int		killsig;	/* signal sent on fatal exit */
601 extern APlist		*free_alp;	/* defragmentation list */
602 
603 extern uint_t		audit_argcnt;	/* no. of stack args to copy */
604 extern Audit_desc	*auditors;	/* global auditors */
605 extern APlist		*aud_preinit;	/* list of objects defining local */
606 extern APlist		*aud_activity;	/*    preinit and activity auditors */
607 
608 extern char		**_environ;	/* environ reference for libc */
609 
610 extern const char	*dbg_file;	/* debugging directed to a file */
611 
612 extern Reglist		*reglist;	/* list of register symbols */
613 
614 extern const Msg	err_reject[];	/* rejection error message tables */
615 extern const Msg	ldd_reject[];
616 extern const Msg	ldd_warn[];
617 
618 extern const char	*profile_name;	/* object being profiled */
619 extern const char	*profile_out;	/* profile output file */
620 extern const char	*profile_lib;	/* audit library to perform profile */
621 
622 extern Dl_argsinfo	argsinfo;	/* process argument, environment and */
623 					/*	auxv information */
624 
625 extern const char	*err_strs[ERR_NUM];
626 					/* diagnostic error string headers */
627 extern const char	*nosym_str;	/* MSG_GEN_NOSYM message cache */
628 
629 extern Syscapset	*org_scapset;	/* original system capabilities */
630 extern Syscapset	*alt_scapset;	/* alternative system capabilities */
631 
632 extern const char	*rpl_hwcap;	/* replaceable hwcap str */
633 extern const char	*rpl_sfcap;	/* replaceable sfcap str */
634 extern const char	*rpl_machcap;	/* replaceable machcap str */
635 extern const char	*rpl_platcap;	/* replaceable platcap str */
636 extern const char	*rpl_cap_files;	/* associated files */
637 
638 extern const char	*prm_hwcap;	/* permanent hwcap str */
639 extern const char	*prm_sfcap;	/* permanent sfcap str */
640 extern const char	*prm_machcap;	/* permanent machcap str */
641 extern const char	*prm_platcap;	/* permanent platcap str */
642 extern const char	*prm_cap_files;	/* associated files */
643 
644 extern avl_tree_t	*capavl;	/* capabilities files */
645 extern avl_tree_t	*nfavl;		/* not-found path names */
646 extern avl_tree_t	*spavl;		/* secure path names */
647 
648 extern u_longlong_t	cnt_map;	/* Incr. for each object mapped */
649 extern u_longlong_t	cnt_unmap;	/* Incr. for each object unmapped */
650 
651 /*
652  * Function declarations.
653  */
654 extern void		addfree(void *, size_t);
655 extern int		append_alias(Rt_map *, const char *, int *);
656 extern Rt_map		*analyze_lmc(Lm_list *, Aliste, Rt_map *, Rt_map *,
657 			    int *);
658 extern void		atexit_fini(void);
659 extern int		bind_one(Rt_map *, Rt_map *, uint_t);
660 extern int		bufprint(Prfbuf *, const char *, ...);
661 extern void		call_array(Addr *, uint_t, Rt_map *, Word);
662 extern void		call_fini(Lm_list *, Rt_map **, Rt_map *);
663 extern void		call_init(Rt_map **, int);
664 extern int		callable(Rt_map *, Rt_map *, Grp_hdl *, uint_t);
665 extern Rt_map		*_caller(caddr_t, int);
666 extern caddr_t		caller(void);
667 extern void		*calloc(size_t, size_t);
668 extern int		cap_alternative(void);
669 extern int		cap_check_fdesc(Fdesc *, Cap *, char *, Rej_desc *);
670 extern int		cap_check_lmp(Rt_map *, Rej_desc *);
671 extern int		cap_filtees(Alist **, Aliste, const char *, Aliste,
672 			    Rt_map *, Rt_map *, const char *, int, uint_t,
673 			    int *);
674 extern int		cap_match(Sresult *, uint_t, Sym *, char *);
675 extern const char	*_conv_reloc_type(uint_t rel);
676 extern Aliste		create_cntl(Lm_list *, int);
677 extern void		defrag(void);
678 extern int		dbg_setup(const char *, Dbg_desc *);
679 extern const char	*demangle(const char *);
680 extern int		dlclose_intn(Grp_hdl *, Rt_map *);
681 extern int		dlclose_core(Grp_hdl *, Rt_map *, Lm_list *);
682 extern int		dlsym_handle(Grp_hdl *, Slookup *, Sresult *, uint_t *,
683 			    int *);
684 extern void		*dlsym_intn(void *, const char *, Rt_map *, Rt_map **);
685 extern Grp_hdl		*dlmopen_intn(Lm_list *, const char *, int, Rt_map *,
686 			    uint_t, uint_t);
687 extern size_t		doprf(const char *, va_list, Prfbuf *);
688 extern int		dowrite(Prfbuf *);
689 extern void		*dz_map(Lm_list *, caddr_t, size_t, int, int);
690 extern int		enter(int);
691 extern uint_t		expand(char **, size_t *, char **, uint_t, uint_t,
692 			    Rt_map *);
693 extern int		expand_paths(Rt_map *, const char *, Alist **, Aliste,
694 			    uint_t, uint_t);
695 extern void		free_hdl(Grp_hdl *);
696 extern void		file_notfound(Lm_list *, const char *, Rt_map *,
697 			    uint_t, Rej_desc *);
698 extern int		find_path(Lm_list *, Rt_map *, uint_t, Fdesc *,
699 			    Rej_desc *, int *);
700 extern int		fpavl_insert(Lm_list *, Rt_map *, const char *,
701 			    avl_index_t);
702 extern Rt_map		*fpavl_recorded(Lm_list *, const char *, uint_t,
703 			    avl_index_t *);
704 extern void		fpavl_remove(Rt_map *);
705 extern size_t		fullpath(Rt_map *, Fdesc *);
706 extern Lmid_t		get_linkmap_id(Lm_list *);
707 extern Pdesc		*get_next_dir(Spath_desc *, Rt_map *, uint_t);
708 extern Grp_desc		*hdl_add(Grp_hdl *, Rt_map *, uint_t, int *);
709 extern Grp_hdl		*hdl_create(Lm_list *, Rt_map *, Rt_map *, uint_t,
710 			    uint_t, uint_t);
711 extern int		hdl_initialize(Grp_hdl *, Rt_map *, int, int);
712 extern int		hwcap1_check(Syscapset *, Xword, Rej_desc *);
713 extern int		hwcap2_check(Syscapset *, Xword, Rej_desc *);
714 extern void		is_dep_init(Rt_map *, Rt_map *);
715 extern int		is_move_data(caddr_t);
716 extern int		is_path_secure(char *, Rt_map *, uint_t, uint_t);
717 extern int		is_rtld_setuid();
718 extern int		is_sym_interposer(Rt_map *, Sym *);
719 extern void		ldso_plt_init(Rt_map *);
720 extern void		leave(Lm_list *, int);
721 extern void		lm_append(Lm_list *, Aliste, Rt_map *);
722 extern void		lm_delete(Lm_list *, Rt_map *, Rt_map *);
723 extern void		lm_move(Lm_list *, Aliste, Aliste, Lm_cntl *,
724 			    Lm_cntl *);
725 extern Rt_map		*load_cap(Lm_list *, Aliste, const char *, Rt_map *,
726 			    uint_t, uint_t, Grp_hdl **, Rej_desc *, int *);
727 extern void		load_completion(Rt_map *);
728 extern Rt_map		*load_file(Lm_list *, Aliste, Rt_map *, Fdesc *, int *);
729 extern Rt_map		*load_path(Lm_list *, Aliste, Rt_map *, int, uint_t,
730 			    Grp_hdl **, Fdesc *, Rej_desc *, int *);
731 extern Rt_map		*load_one(Lm_list *, Aliste, Alist *, Rt_map *, int,
732 			    uint_t, Grp_hdl **, int *);
733 extern const char	*load_trace(Lm_list *, Pdesc *, Rt_map *, Fdesc *);
734 extern void		nfavl_insert(const char *, avl_index_t);
735 extern void		*nu_map(Lm_list *, caddr_t, size_t, int, int);
736 extern Fct		*map_obj(Lm_list *, Fdesc *, size_t, const char *, int,
737 			    Rej_desc *);
738 extern void		*malloc(size_t);
739 extern int		machcap_check(Syscapset *, const char *, Rej_desc *);
740 extern void		machine_name(Syscapset *);
741 extern int		move_data(Rt_map *, APlist **);
742 extern int		platcap_check(Syscapset *, const char *, Rej_desc *);
743 extern void		platform_name(Syscapset *);
744 extern int		pnavl_recorded(avl_tree_t **, const char *, uint_t,
745 			    avl_index_t *);
746 extern int		procenv_user(APlist *, Word *, Word *);
747 extern void		rd_event(Lm_list *, rd_event_e, r_state_e);
748 extern int		readenv_user(const char **, APlist **);
749 extern int		readenv_config(Rtc_env *, Addr);
750 extern void		rejection_inherit(Rej_desc *, Rej_desc *);
751 extern int		relocate_lmc(Lm_list *, Aliste, Rt_map *, Rt_map *,
752 			    int *);
753 extern int		relocate_finish(Rt_map *, APlist *, int);
754 extern void		remove_alist(Alist **, int);
755 extern void		remove_cntl(Lm_list *, Aliste);
756 extern int		remove_hdl(Grp_hdl *, Rt_map *, int *);
757 extern void		remove_lmc(Lm_list *, Rt_map *, Aliste, const char *);
758 extern void		remove_lml(Lm_list *);
759 extern void		remove_so(Lm_list *, Rt_map *, Rt_map *);
760 extern int		rt_critical(void);
761 extern int		rt_bind_guard(int);
762 extern int		rt_bind_clear(int);
763 extern int		rt_get_extern(Lm_list *, Rt_map *);
764 extern int		rt_mutex_lock(Rt_lock *);
765 extern int		rt_mutex_unlock(Rt_lock *);
766 extern void		rt_thr_init(Lm_list *);
767 extern thread_t		rt_thr_self(void);
768 extern void		rtld_db_dlactivity(Lm_list *);
769 extern void		rtld_db_preinit(Lm_list *);
770 extern void		rtld_db_postinit(Lm_list *);
771 extern void		rtldexit(Lm_list *, int);
772 #ifndef _LP64
773 extern int		rtld_fstat(int, rtld_stat_t *restrict);
774 extern int		rtld_stat(const char *restrict, rtld_stat_t *restrict);
775 #endif
776 extern int		rtld_getopt(char **, char ***, auxv_t **, Word *,
777 			    Word *);
778 extern void		security(uid_t, uid_t, gid_t, gid_t, int);
779 extern void		set_environ(Lm_list *);
780 extern void		set_dirs(Alist **, Spath_defn *, uint_t);
781 extern int		set_prot(Rt_map *, mmapobj_result_t *, int);
782 extern Rt_map		*setup(char **, auxv_t *, Word, char *, int, char *,
783 			    ulong_t, ulong_t, int fd, Phdr *, char *, char **,
784 			    uid_t, uid_t, gid_t, gid_t, int, uint_t *);
785 extern const char	*stravl_insert(const char *, uint_t, size_t, int);
786 extern void		spavl_insert(const char *);
787 extern int		sfcap1_check(Syscapset *, Xword, Rej_desc *);
788 extern int		tls_assign(Lm_list *, Rt_map *, Phdr *);
789 extern void		tls_modaddrem(Rt_map *, uint_t);
790 extern int		tls_statmod(Lm_list *, Rt_map *);
791 extern Rt_map		**tsort(Rt_map *, int, int);
792 extern void		unused(Lm_list *);
793 extern void		unmap_obj(mmapobj_result_t *, uint_t);
794 extern int		update_mode(Rt_map *, int, int);
795 extern void		zero(caddr_t, size_t);
796 
797 #if	defined(__sparc)
798 /*
799  * SPARC Register symbol support.
800  */
801 extern int		elf_regsyms(Rt_map *);
802 extern void		set_sparc_g1(ulong_t);
803 extern void		set_sparc_g2(ulong_t);
804 extern void		set_sparc_g3(ulong_t);
805 extern void		set_sparc_g4(ulong_t);
806 extern void		set_sparc_g5(ulong_t);
807 extern void		set_sparc_g6(ulong_t);
808 extern void		set_sparc_g7(ulong_t);
809 #endif
810 
811 extern long		_sysconfig(int);
812 
813 #ifdef	__cplusplus
814 }
815 #endif
816 
817 #endif /* __RTLD_H */
818