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 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 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 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 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 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