xref: /titanic_44/usr/src/cmd/sgs/rtld/common/globals.c (revision 2b4a78020b9c38d1b95e2f3fefa6d6e4be382d1f)
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  *
27  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
28  * Use is subject to license terms.
29  */
30 
31 #include	<sys/types.h>
32 #include	<sys/mman.h>
33 #include	<signal.h>
34 #include	<dlfcn.h>
35 #include	<synch.h>
36 #include	<debug.h>
37 #include	"_rtld.h"
38 
39 /*
40  * Declarations of global variables used in ld.so.
41  */
42 Rt_lock		rtldlock;
43 int		thr_flg_nolock = 0;
44 int		thr_flg_reenter = 0;
45 
46 /*
47  * Major link-map lists.
48  */
49 Lm_list		lml_main =	{ 0 };		/* the `main's link map list */
50 Lm_list		lml_rtld =	{ 0 };		/* rtld's link map list */
51 
52 /*
53  * Entrance count.  Each time ld.so.1 is entered following initial process
54  * setup, this count is bumped.  This value serves to identify the present
55  * ld.so.1 operation.
56  *
57  * An ld.so.1 operation can result in many symbol lookup requests (i.e., loading
58  * objects and relocating all symbolic bindings).  This count is used to protect
59  * against attempting to re-load a failed lazy load within a single call to
60  * ld.so.1, while allowing such attempts across calls.  Should a lazy load fail,
61  * the present operation identifier is saved in the current symbol lookup data
62  * block (Slookup).  Should a lazy load fall back operation be triggered, the
63  * identifier in the symbol lookup block is compared to the current ld.so.1
64  * entry count, and if the two are equal the fall back is skipped.
65  *
66  * With this count, there is a danger of wrap-around, although as an unsigned
67  * 32-bit value, it is highly unlikely that any application could usefully make
68  * 4.3 giga-calls into ld.so.1.  The worst that can occur is that a fall back
69  * lazy load isn't triggered.  However, most lazy loads that fail typically
70  * continue to fail unless the user takes corrective action (adds the necessary
71  * (fixed) dependencies to the system).
72  */
73 ulong_t		ld_entry_cnt = 1;
74 
75 /*
76  * BEGIN: Exposed to rtld_db, don't change without a coordinated handshake with
77  * librtld_db (remembering that librtld_db must be able to read old as well as
78  * current core files).
79  */
80 List		dynlm_list =	{ 0, 0 };	/* dynamic list of link-maps */
81 /*
82  * END: Exposed to rtld_db
83  */
84 
85 Reglist *	reglist = 0;			/* list of register symbols */
86 
87 ulong_t		hwcap = 0;			/* hardware capabilities */
88 ulong_t		sfcap = 0;			/* software capabilities */
89 
90 /*
91  * Initialized fmap structure.
92  */
93 static Fmap	_fmap = { 0, 0, 0, 0, 0 };
94 Fmap *		fmap = &_fmap;			/* initial file mapping info */
95 
96 /*
97  * Set of integers to track how many of what type of PLT's have been bound.
98  * This is only really interesting for SPARC since ia32 has only one PLT.
99  */
100 uint32_t	pltcnt21d = 0;
101 uint32_t	pltcnt24d = 0;
102 uint32_t	pltcntu32 = 0;
103 uint32_t	pltcntu44 = 0;
104 uint32_t	pltcntfull = 0;
105 uint32_t	pltcntfar = 0;
106 
107 /*
108  * Provide for recording not-found path names.
109  */
110 avl_tree_t	*nfavl = NULL;
111 
112 /*
113  * Enable technology (via status flags for RTLD) dependent upon whether we're
114  * in a patch or major release build environment.
115  */
116 uint_t		rtld_flags =
117 #ifdef	EXPAND_RELATIVE
118 			RT_FL_RELATIVE |
119 #endif
120 #ifdef	SIEBEL_DISABLE
121 			RT_FL_DISFIX_1 |
122 #endif
123 			RT_FL_NOCONCUR;
124 uint_t		rtld_flags2 = 0;
125 
126 /*
127  * Various other global data.
128  */
129 Lc_desc		glcs[CI_MAX];		/* global external interfaces */
130 
131 const char	*procname = (const char *)0;
132 const char	*rtldname = MSG_ORIG(MSG_FIL_RTLD);
133 
134 char		*lasterr = (char *)0;	/* string describing last error */
135 					/*	cleared by each dlerror() */
136 Interp		*interp = 0;		/* ELF interpreter info */
137 List		hdl_list[HDLIST_SZ+2];	/* dlopen() handle list */
138 size_t		syspagsz = 0;		/* system page size */
139 unsigned long	at_flags = 0;		/* machine specific file flags */
140 char		*platform = 0;		/* platform name from AT_SUN_PLATFORM */
141 size_t		platform_sz = 0;	/* platform string length */
142 Uts_desc	*uts;			/* utsname descriptor */
143 Isa_desc	*isa;			/* isalist descriptor */
144 
145 uint_t		audit_argcnt = 64;	/* no. of stack args to copy (default */
146 					/*	is all) */
147 Audit_desc	*auditors = 0;		/* global auditors (LD_AUDIT) */
148 
149 const char	*rpl_audit = 0;		/* replaceable LD_AUDIT string */
150 const char	*rpl_debug = 0;		/* replaceable LD_DEBUG string */
151 const char	*rpl_ldflags = 0;	/* replaceable LD_FLAGS string */
152 const char	*rpl_libpath = 0;	/* replaceable LD_LIBRARY_PATH string */
153 Pnode		*rpl_libdirs = 0;	/*	and associated Pnode list */
154 const char	*rpl_preload = 0;	/* replaceable LD_PRELOAD string */
155 
156 const char	*prm_audit = 0;		/* permanent LD_AUDIT string */
157 const char	*prm_debug = 0;		/* permanent LD_DEBUG string */
158 const char	*prm_ldflags = 0;	/* permanent LD_FLAGS string */
159 const char	*prm_libpath = 0;	/* permanent LD_LIBRARY_PATH string */
160 Pnode		*prm_libdirs = 0;	/*	and associated Pnode list */
161 const char	*prm_preload = 0;	/* permanent LD_PRELOAD string */
162 
163 uint_t		env_info = 0;		/* information regarding environment */
164 					/*	variables */
165 int		killsig = SIGKILL;	/* signal sent on fatal exit */
166 
167 /*
168  * Note, the debugging descriptor interposes on the default definition provided
169  * by liblddbg.  This is required as ld.so.1 must only have outstanding relative
170  * relocations.
171  */
172 static Dbg_desc	_dbg_desc = {0, 0, 0};
173 Dbg_desc	*dbg_desc = &_dbg_desc;	/* debugging descriptor */
174 const char	*dbg_file = 0;		/* debugging directed to file */
175 
176 #pragma weak	environ = _environ	/* environ for PLT tracing - we */
177 char		**_environ = 0;		/* supply the pair to satisfy any */
178 					/* libc requirements (hwmuldiv) */
179 
180 const char	*profile_name;		/* object being profiled */
181 const char	*profile_out;		/* profile output file */
182 const char	*profile_lib;		/* audit library to perform profile */
183 
184 unsigned char	search_rules[] = {	/* dependency search rules */
185 		RPLENV,			/*	replaceable LD_LIBRARY_PATH */
186 		PRMENV,			/*	permanent LD_LIBRARY_PATH */
187 		RUNPATH,		/*	callers runpath */
188 		DEFAULT,		/*	default library path */
189 		0
190 };
191 
192 Dl_argsinfo	argsinfo = { 0 };	/* process argument, environment and */
193 					/*	auxv information. */
194 
195 /*
196  * Frequently used messages are cached here to reduce _dgettext() overhead and
197  * also provide for resetting should the locale change (see _ld_libc()).
198  */
199 const char	*err_strs[ERR_NUM] = { 0 };
200 const char	*nosym_str = 0;
201 
202 
203 /*
204  * Rejection error message tables.
205  */
206 const Msg
207 ldd_reject[] = {
208 		MSG_STR_EMPTY,
209 		MSG_LDD_REJ_MACH,	/* MSG_INTL(MSG_LDD_REJ_MACH) */
210 		MSG_LDD_REJ_CLASS,	/* MSG_INTL(MSG_LDD_REJ_CLASS) */
211 		MSG_LDD_REJ_DATA,	/* MSG_INTL(MSG_LDD_REJ_DATA) */
212 		MSG_LDD_REJ_TYPE,	/* MSG_INTL(MSG_LDD_REJ_TYPE) */
213 		MSG_LDD_REJ_BADFLAG,	/* MSG_INTL(MSG_LDD_REJ_BADFLAG) */
214 		MSG_LDD_REJ_MISFLAG,	/* MSG_INTL(MSG_LDD_REJ_MISFLAG) */
215 		MSG_LDD_REJ_VERSION,	/* MSG_INTL(MSG_LDD_REJ_VERSION) */
216 		MSG_LDD_REJ_HAL,	/* MSG_INTL(MSG_LDD_REJ_HAL) */
217 		MSG_LDD_REJ_US3,	/* MSG_INTL(MSG_LDD_REJ_US3) */
218 		MSG_LDD_REJ_STR,	/* MSG_INTL(MSG_LDD_REJ_STR) */
219 		MSG_LDD_REJ_UNKFILE,	/* MSG_INTL(MSG_LDD_REJ_UNKFILE) */
220 		MSG_LDD_REJ_HWCAP_1,	/* MSG_INTL(MSG_LDD_REJ_HWCAP_1) */
221 		MSG_LDD_REJ_SFCAP_1,	/* MSG_INTL(MSG_LDD_REJ_SFCAP_1) */
222 	};
223 
224 
225 const Msg
226 err_reject[] = {
227 		MSG_STR_EMPTY,
228 		MSG_ERR_REJ_MACH,	/* MSG_INTL(MSG_ERR_REJ_MACH) */
229 		MSG_ERR_REJ_CLASS,	/* MSG_INTL(MSG_ERR_REJ_CLASS) */
230 		MSG_ERR_REJ_DATA,	/* MSG_INTL(MSG_ERR_REJ_DATA) */
231 		MSG_ERR_REJ_TYPE,	/* MSG_INTL(MSG_ERR_REJ_TYPE) */
232 		MSG_ERR_REJ_BADFLAG,	/* MSG_INTL(MSG_ERR_REJ_BADFLAG) */
233 		MSG_ERR_REJ_MISFLAG,	/* MSG_INTL(MSG_ERR_REJ_MISFLAG) */
234 		MSG_ERR_REJ_VERSION,	/* MSG_INTL(MSG_ERR_REJ_VERSION) */
235 		MSG_ERR_REJ_HAL,	/* MSG_INTL(MSG_ERR_REJ_HAL) */
236 		MSG_ERR_REJ_US3,	/* MSG_INTL(MSG_ERR_REJ_US3) */
237 		MSG_ERR_REJ_STR,	/* MSG_INTL(MSG_ERR_REJ_STR) */
238 		MSG_ERR_REJ_UNKFILE,	/* MSG_INTL(MSG_ERR_REJ_UNKFILE) */
239 		MSG_ERR_REJ_HWCAP_1,	/* MSG_INTL(MSG_ERR_REJ_HWCAP_1) */
240 		MSG_ERR_REJ_SFCAP_1,	/* MSG_INTL(MSG_ERR_REJ_SFCAP_1) */
241 	};
242