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) 1996, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25 #include <link.h>
26 #include <sys/types.h>
27 #include <sys/param.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <string.h>
32 #include <errno.h>
33 #include <signal.h>
34 #include "env.h"
35 #include "mach.h"
36
37 static Elist *bindto_list = NULL;
38 static Elist *bindfrom_list = NULL;
39
40 static uint_t pidout = 0;
41 static pid_t pid;
42 static FILE *outfile = stderr;
43 static uint_t indent = 1;
44 static uint_t indent_level = 1;
45 static uint_t trussall = 0;
46 static uint_t noexit = 0;
47 static sigset_t iset;
48
49 /*
50 * It's not possible to gather the return code on routines
51 * which actually have a dependence on the 'stack frame structure'.
52 * Below is a list of known symbols which have this dependency,
53 * truss.so will disable the la_pltexit() entry point for these
54 * routines, which will remove the requirement for the extra
55 * stackframe that the link_auditing interface creates.
56 *
57 * NOTE: this list *must* be mainted in alphabetical order.
58 * if this list ever became to long a faster search mechanism
59 * should be considered.
60 */
61 static char *spec_sym[] = {
62 #if defined(__sparc)
63 ".stret1",
64 ".stret2",
65 ".stret4",
66 ".stret8",
67 #endif
68 "__getcontext",
69 "_getcontext",
70 "_getsp",
71 "_longjmp",
72 "_setcontext",
73 "_setjmp",
74 "_siglongjmp",
75 "_sigsetjmp",
76 "_vfork",
77 "getcontext",
78 "getsp",
79 "longjmp",
80 "setcontext",
81 "setjmp",
82 "siglongjmp",
83 "sigsetjmp",
84 "vfork",
85 (char *)0
86 };
87
88 uint_t
la_version(uint_t version)89 la_version(uint_t version)
90 {
91 char *str;
92
93 if (version > LAV_CURRENT)
94 (void) fprintf(stderr, "truss.so: unexpected version: %d\n",
95 version);
96
97 build_env_list(&bindto_list, (const char *)"TRUSS_BINDTO");
98 build_env_list(&bindfrom_list, (const char *)"TRUSS_BINDFROM");
99
100 if (checkenv((const char *)"TRUSS_PID")) {
101 pidout = 1;
102 pid = getpid();
103 } else {
104 char *str = "LD_AUDIT=";
105 /*
106 * This disables truss output in subsequent fork()/exec
107 * processes.
108 */
109 (void) putenv(str);
110 }
111
112 if (checkenv((const char *)"TRUSS_NOEXIT")) {
113 noexit++;
114 indent = 0;
115 }
116
117 if (checkenv((const char *)"TRUSS_NOINDENT"))
118 indent = 0;
119
120 if (checkenv((const char *)"TRUSS_ALL"))
121 trussall++;
122
123 if (str = checkenv((const char *)"TRUSS_OUTPUT")) {
124 FILE *fp;
125 char fname[MAXPATHLEN];
126
127 if (pidout)
128 (void) snprintf(fname, MAXPATHLEN, "%s.%d", str,
129 (int)pid);
130 else
131 (void) strncpy(fname, str, MAXPATHLEN);
132
133 if (fp = fopen(fname, (const char *)"w")) {
134 outfile = fp;
135 } else
136 (void) fprintf(stderr,
137 "truss.so: unable to open file=`%s': %s\n",
138 fname, strerror(errno));
139 }
140
141 /*
142 * Initalize iset to the full set of signals to be masked durring
143 * pltenter/pltexit
144 */
145 (void) sigfillset(&iset);
146
147 return (LAV_CURRENT);
148 }
149
150 /* ARGSUSED1 */
151 uint_t
la_objopen(Link_map * lmp,Lmid_t lmid,uintptr_t * cookie)152 la_objopen(Link_map *lmp, Lmid_t lmid, uintptr_t *cookie)
153 {
154 uint_t flags;
155 char *basename;
156 static int first = 1;
157
158 if ((bindto_list == NULL) || (trussall))
159 flags = LA_FLG_BINDTO;
160 else if (check_list(bindto_list, lmp->l_name))
161 flags = LA_FLG_BINDTO;
162 else
163 flags = 0;
164
165 if (((bindfrom_list == NULL) && first) || trussall ||
166 (check_list(bindfrom_list, lmp->l_name)))
167 flags |= LA_FLG_BINDFROM;
168
169 first = 0;
170
171 if (flags) {
172 if ((basename = strrchr(lmp->l_name, '/')) != NULL)
173 basename++;
174 else
175 basename = lmp->l_name;
176 *cookie = (uintptr_t)basename;
177 }
178
179 return (flags);
180 }
181
182 /* ARGSUSED1 */
183 #if defined(_LP64)
184 uintptr_t
la_symbind64(Elf64_Sym * symp,uint_t symndx,uintptr_t * refcook,uintptr_t * defcook,uint_t * sb_flags,const char * sym_name)185 la_symbind64(Elf64_Sym *symp, uint_t symndx, uintptr_t *refcook,
186 uintptr_t *defcook, uint_t *sb_flags, const char *sym_name)
187 #else
188 uintptr_t
189 la_symbind32(Elf32_Sym *symp, uint_t symndx, uintptr_t *refcook,
190 uintptr_t *defcook, uint_t *sb_flags)
191 #endif
192 {
193 #if !defined(_LP64)
194 const char *sym_name = (const char *)symp->st_name;
195 #endif
196
197
198 if (noexit)
199 *sb_flags |= LA_SYMB_NOPLTEXIT;
200
201 /*
202 * Check to see if this symbol is one of the 'special' symbols.
203 * If so we disable PLTEXIT calls for that symbol.
204 */
205 if ((*sb_flags & LA_SYMB_NOPLTEXIT) == 0) {
206 uint_t ndx;
207 char *str;
208 /* LINTED */
209 for (ndx = 0; str = spec_sym[ndx]; ndx++) {
210 int cmpval;
211 cmpval = strcmp(sym_name, str);
212 if (cmpval < 0)
213 break;
214 if (cmpval == 0) {
215 *sb_flags |= LA_SYMB_NOPLTEXIT;
216 break;
217 }
218 }
219 }
220 return (symp->st_value);
221 }
222
223 /* ARGSUSED1 */
224 #if defined(__sparcv9)
225 uintptr_t
la_sparcv9_pltenter(Elf64_Sym * symp,uint_t symndx,uintptr_t * refcookie,uintptr_t * defcookie,La_sparcv9_regs * regset,uint_t * sb_flags,const char * sym_name)226 la_sparcv9_pltenter(Elf64_Sym *symp, uint_t symndx, uintptr_t *refcookie,
227 uintptr_t *defcookie, La_sparcv9_regs *regset, uint_t *sb_flags,
228 const char *sym_name)
229 #elif defined(__sparc)
230 uintptr_t
231 la_sparcv8_pltenter(Elf32_Sym *symp, uint_t symndx, uintptr_t *refcookie,
232 uintptr_t *defcookie, La_sparcv8_regs *regset, uint_t *sb_flags)
233 #elif defined(__amd64)
234 uintptr_t
235 la_amd64_pltenter(Elf64_Sym *symp, uint_t symndx, uintptr_t *refcookie,
236 uintptr_t *defcookie, La_amd64_regs *regset, uint_t *sb_flags,
237 const char *sym_name)
238 #elif defined(__i386)
239 uintptr_t
240 la_i86_pltenter(Elf32_Sym *symp, uint_t symndx, uintptr_t *refcookie,
241 uintptr_t *defcookie, La_i86_regs *regset, uint_t *sb_flags)
242 #endif
243 {
244 char *istr;
245 char *defname = (char *)(*defcookie);
246 char *refname = (char *)(*refcookie);
247 #if !defined(_LP64)
248 const char *sym_name = (const char *)symp->st_name;
249 #endif
250 sigset_t oset;
251
252 (void) sigprocmask(SIG_BLOCK, &iset, &oset);
253
254 if (pidout)
255 (void) fprintf(outfile, "%5d:", (int)getpid());
256
257 if ((*sb_flags & LA_SYMB_NOPLTEXIT) == 0)
258 istr = "";
259 else
260 istr = "*";
261
262 (void) fprintf(outfile, "%-15s -> %15s:%-*s%s(0x%lx, 0x%lx, 0x%lx)\n",
263 refname, defname, indent_level, istr, sym_name,
264 (long)GETARG0(regset), (long)GETARG1(regset),
265 (long)GETARG2(regset));
266
267 (void) fflush(outfile);
268 if (indent && ((*sb_flags & LA_SYMB_NOPLTEXIT) == 0))
269 indent_level++;
270 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
271 return (symp->st_value);
272 }
273
274 /* ARGSUSED1 */
275 #if defined(_LP64)
276 /* ARGSUSED */
277 uintptr_t
la_pltexit64(Elf64_Sym * symp,uint_t symndx,uintptr_t * refcookie,uintptr_t * defcookie,uintptr_t retval,const char * sym_name)278 la_pltexit64(Elf64_Sym *symp, uint_t symndx, uintptr_t *refcookie,
279 uintptr_t *defcookie, uintptr_t retval, const char *sym_name)
280 #else
281 uintptr_t
282 la_pltexit(Elf32_Sym *symp, uint_t symndx, uintptr_t *refcookie,
283 uintptr_t *defcookie, uintptr_t retval)
284 #endif
285 {
286 char *defname = (char *)(*defcookie);
287 char *refname = (char *)(*refcookie);
288 sigset_t oset;
289 #if !defined(_LP64)
290 const char *sym_name = (const char *)symp->st_name;
291 #endif
292
293 (void) sigprocmask(SIG_BLOCK, &iset, &oset);
294
295 if (pidout)
296 (void) fprintf(outfile, "%5d:", (int)pid);
297 if (indent)
298 indent_level--;
299 (void) fprintf(outfile, "%-15s -> %15s:%*s%s - 0x%lx\n", refname,
300 defname, indent_level, "", sym_name, (ulong_t)retval);
301 (void) fflush(outfile);
302 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
303 return (retval);
304 }
305