sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 1 | /*--------------------------------------------------------------------*/ |
| 2 | /*--- Management of function redirection and wrapping. ---*/ |
| 3 | /*--- vg_redir.c ---*/ |
| 4 | /*--------------------------------------------------------------------*/ |
| 5 | |
| 6 | /* |
| 7 | This file is part of Valgrind, an extensible x86 protected-mode |
| 8 | emulator for monitoring program execution on x86-Unixes. |
| 9 | |
njn | 5361242 | 2005-03-12 16:22:54 +0000 | [diff] [blame] | 10 | Copyright (C) 2000-2005 Julian Seward |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 11 | jseward@acm.org |
| 12 | Copyright (C) 2003-2005 Jeremy Fitzhardinge |
| 13 | jeremy@goop.org |
| 14 | |
| 15 | This program is free software; you can redistribute it and/or |
| 16 | modify it under the terms of the GNU General Public License as |
| 17 | published by the Free Software Foundation; either version 2 of the |
| 18 | License, or (at your option) any later version. |
| 19 | |
| 20 | This program is distributed in the hope that it will be useful, but |
| 21 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 23 | General Public License for more details. |
| 24 | |
| 25 | You should have received a copy of the GNU General Public License |
| 26 | along with this program; if not, write to the Free Software |
| 27 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 28 | 02111-1307, USA. |
| 29 | |
| 30 | The GNU General Public License is contained in the file COPYING. |
| 31 | */ |
| 32 | #include "core.h" |
| 33 | #include "vg_symtab2.h" |
| 34 | |
sewardj | 55f9d1a | 2005-04-25 11:11:44 +0000 | [diff] [blame] | 35 | #include "pub_core_aspacemgr.h" |
njn | 641d5cc | 2005-05-12 04:37:27 +0000 | [diff] [blame] | 36 | #include "pub_core_skiplist.h" |
sewardj | 55f9d1a | 2005-04-25 11:11:44 +0000 | [diff] [blame] | 37 | |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 38 | /*------------------------------------------------------------*/ |
| 39 | /*--- General purpose redirection. ---*/ |
| 40 | /*------------------------------------------------------------*/ |
| 41 | |
| 42 | /* |
| 43 | wraps and redirections, indexed by from_addr |
| 44 | |
| 45 | Redirection and wrapping are two distinct mechanisms which Valgrind |
| 46 | can use to change the client's control flow. |
| 47 | |
| 48 | Redirection intercepts a call to a client function, and re-points it |
| 49 | to a new piece of code (presumably functionally equivalent). The |
| 50 | original code is never run. |
| 51 | |
| 52 | Wrapping does call the client's original code, but calls "before" |
| 53 | and "after" functions which can inspect (and perhaps modify) the |
| 54 | function's arguments and return value. |
| 55 | */ |
| 56 | struct _CodeRedirect { |
| 57 | enum redir_type { |
| 58 | R_REDIRECT, /* plain redirection */ |
| 59 | R_WRAPPER, /* wrap with valgrind-internal code */ |
| 60 | R_CLIENT_WRAPPER, /* wrap with client-side code */ |
| 61 | } type; |
| 62 | |
| 63 | const Char *from_lib; /* library qualifier pattern */ |
| 64 | const Char *from_sym; /* symbol */ |
| 65 | Addr from_addr; /* old addr */ |
| 66 | |
| 67 | /* used for redirection */ |
| 68 | const Char *to_lib; /* library qualifier pattern */ |
| 69 | const Char *to_sym; /* symbol */ |
| 70 | Addr to_addr; /* new addr */ |
| 71 | |
| 72 | /* used for wrapping */ |
| 73 | const FuncWrapper *wrapper; |
| 74 | |
| 75 | CodeRedirect *next; /* next pointer on unresolved list */ |
| 76 | }; |
| 77 | |
| 78 | static Char *straddr(void *p) |
| 79 | { |
| 80 | static Char buf[16]; |
| 81 | |
| 82 | VG_(sprintf)(buf, "%p", *(Addr *)p); |
| 83 | |
| 84 | return buf; |
| 85 | } |
| 86 | |
njn | be91aae | 2005-03-27 01:42:41 +0000 | [diff] [blame] | 87 | static SkipList sk_resolved_redir = VG_SKIPLIST_INIT(CodeRedirect, from_addr, |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 88 | VG_(cmp_Addr), straddr, VG_AR_SYMTAB); |
| 89 | static CodeRedirect *unresolved_redir = NULL; |
| 90 | |
| 91 | static Bool match_lib(const Char *pattern, const SegInfo *si) |
| 92 | { |
| 93 | /* pattern == NULL matches everything, otherwise use globbing |
| 94 | |
| 95 | If the pattern starts with: |
| 96 | file:, then match filename |
| 97 | soname:, then match soname |
| 98 | something else, match filename |
| 99 | */ |
| 100 | const Char *name = si->filename; |
| 101 | |
| 102 | if (pattern == NULL) |
| 103 | return True; |
| 104 | |
| 105 | if (VG_(strncmp)(pattern, "file:", 5) == 0) { |
| 106 | pattern += 5; |
| 107 | name = si->filename; |
| 108 | } |
| 109 | if (VG_(strncmp)(pattern, "soname:", 7) == 0) { |
| 110 | pattern += 7; |
| 111 | name = si->soname; |
| 112 | } |
| 113 | |
| 114 | if (name == NULL) |
| 115 | return False; |
| 116 | |
| 117 | return VG_(string_match)(pattern, name); |
| 118 | } |
| 119 | |
| 120 | static inline Bool from_resolved(const CodeRedirect *redir) |
| 121 | { |
| 122 | return redir->from_addr != 0; |
| 123 | } |
| 124 | |
| 125 | static inline Bool to_resolved(const CodeRedirect *redir) |
| 126 | { |
| 127 | if (redir->type == R_REDIRECT) |
| 128 | return redir->to_addr != 0; |
| 129 | vg_assert(redir->wrapper != NULL); |
| 130 | return True; |
| 131 | } |
| 132 | |
| 133 | Bool VG_(is_resolved)(const CodeRedirect *redir) |
| 134 | { |
| 135 | return from_resolved(redir) && to_resolved(redir); |
| 136 | } |
| 137 | |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 138 | static void add_resolved(CodeRedirect *redir) |
| 139 | { |
| 140 | switch(redir->type) { |
| 141 | case R_REDIRECT: |
| 142 | if (VG_(clo_trace_redir)) { |
| 143 | VG_(message)(Vg_DebugMsg, " redir resolved (%s:%s=%p -> ", |
| 144 | redir->from_lib, redir->from_sym, redir->from_addr); |
| 145 | VG_(message)(Vg_DebugMsg, " %s:%s=%p)", |
| 146 | redir->to_lib, redir->to_sym, redir->to_addr); |
| 147 | } |
| 148 | |
| 149 | if (VG_(search_transtab)(NULL, (Addr64)redir->from_addr, False)) { |
| 150 | /* For some given (from, to) redir, the "from" function got |
| 151 | called before the .so containing "to" became available. We |
| 152 | know this because there is already a translation for the |
| 153 | entry point of the original "from". So the redirect will |
| 154 | never actually take effect unless that translation is |
| 155 | discarded. |
| 156 | |
| 157 | Note, we only really need to discard the first bb of the |
| 158 | old entry point, and so we avoid the problem of having to |
| 159 | figure out how big that bb was -- since it is at least 1 |
| 160 | byte of original code, we can just pass 1 as the original |
| 161 | size to invalidate_translations() and it will indeed get |
| 162 | rid of the translation. |
| 163 | |
| 164 | Note, this is potentially expensive -- discarding |
| 165 | translations causes complete unchaining. |
| 166 | */ |
| 167 | if (VG_(clo_verbosity) > 2 && VG_(clo_trace_redir)) { |
| 168 | VG_(message)(Vg_UserMsg, |
| 169 | "Discarding translation due to redirect of already called function" ); |
| 170 | VG_(message)(Vg_UserMsg, |
| 171 | " %s (%p -> %p)", |
| 172 | redir->from_sym, redir->from_addr, redir->to_addr ); |
| 173 | } |
| 174 | VG_(discard_translations)((Addr64)redir->from_addr, 1); |
| 175 | } |
| 176 | |
| 177 | { |
| 178 | CodeRedirect *r = VG_(SkipList_Find_Exact)(&sk_resolved_redir, &redir->from_addr); |
| 179 | |
| 180 | if (r == NULL) |
| 181 | VG_(SkipList_Insert)(&sk_resolved_redir, redir); |
| 182 | else { |
| 183 | /* XXX leak redir */ |
| 184 | if (VG_(clo_trace_redir)) |
| 185 | VG_(message)(Vg_DebugMsg, " redir %s:%s:%p->%s:%s:%p duplicated\n", |
| 186 | redir->from_lib, redir->from_sym, redir->from_addr, |
| 187 | redir->to_lib, redir->to_sym, redir->to_addr); |
| 188 | } |
| 189 | } |
| 190 | break; |
| 191 | |
| 192 | case R_WRAPPER: |
| 193 | if (VG_(clo_trace_redir)) { |
| 194 | VG_(message)(Vg_DebugMsg, " wrapper resolved (%s:%s=%p -> wrapper)", |
| 195 | redir->from_lib, redir->from_sym, redir->from_addr); |
| 196 | } |
| 197 | |
| 198 | /* XXX redir leaked */ |
| 199 | //VG_(wrap_function)(redir->from_addr, redir->wrapper); |
| 200 | break; |
| 201 | |
| 202 | case R_CLIENT_WRAPPER: |
| 203 | VG_(core_panic)("not implemented"); |
| 204 | break; |
| 205 | } |
| 206 | } |
| 207 | |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 208 | /* Resolve a redir using si if possible, and add it to the resolved |
| 209 | list */ |
| 210 | Bool VG_(resolve_redir)(CodeRedirect *redir, const SegInfo *si) |
| 211 | { |
| 212 | Bool resolved; |
| 213 | |
| 214 | vg_assert(si != NULL); |
| 215 | vg_assert(si->seg != NULL); |
| 216 | |
| 217 | /* no redirection from Valgrind segments */ |
| 218 | if (si->seg->flags & SF_VALGRIND) |
| 219 | return False; |
| 220 | |
| 221 | resolved = VG_(is_resolved)(redir); |
| 222 | |
| 223 | if (0 && VG_(clo_trace_redir)) |
| 224 | VG_(printf)(" consider FROM binding %s:%s -> %s:%s in %s(%s)\n", |
| 225 | redir->from_lib, redir->from_sym, |
| 226 | redir->to_lib, redir->to_sym, |
| 227 | si->filename, si->soname); |
| 228 | |
| 229 | vg_assert(!resolved); |
| 230 | |
| 231 | if (!from_resolved(redir)) { |
| 232 | vg_assert(redir->from_sym != NULL); |
| 233 | |
| 234 | if (match_lib(redir->from_lib, si)) { |
| 235 | redir->from_addr = VG_(reverse_search_one_symtab)(si, redir->from_sym); |
| 236 | if (VG_(clo_trace_redir) && redir->from_addr != 0) |
| 237 | VG_(printf)(" bind FROM: %p = %s:%s\n", |
| 238 | redir->from_addr,redir->from_lib, redir->from_sym ); |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | if (!to_resolved(redir)) { |
| 243 | vg_assert(redir->type == R_REDIRECT); |
| 244 | vg_assert(redir->to_sym != NULL); |
| 245 | |
| 246 | if (match_lib(redir->to_lib, si)) { |
| 247 | redir->to_addr = VG_(reverse_search_one_symtab)(si, redir->to_sym); |
| 248 | if (VG_(clo_trace_redir) && redir->to_addr != 0) |
| 249 | VG_(printf)(" bind TO: %p = %s:%s\n", |
| 250 | redir->to_addr,redir->to_lib, redir->to_sym ); |
| 251 | |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | resolved = from_resolved(redir) && to_resolved(redir); |
| 256 | |
| 257 | if (0 && VG_(clo_trace_redir)) |
| 258 | VG_(printf)("resolve_redir: %s:%s from=%p %s:%s to=%p\n", |
| 259 | redir->from_lib, redir->from_sym, redir->from_addr, |
| 260 | redir->to_lib, redir->to_sym, redir->to_addr); |
| 261 | |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 262 | if (resolved) add_resolved(redir); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 263 | |
| 264 | return resolved; |
| 265 | } |
| 266 | |
| 267 | /* Go through the complete redir list, resolving as much as possible with this SegInfo. |
| 268 | |
| 269 | This should be called when a new SegInfo symtab is loaded. |
| 270 | */ |
| 271 | void VG_(resolve_seg_redirs)(SegInfo *si) |
| 272 | { |
| 273 | CodeRedirect **prevp = &unresolved_redir; |
| 274 | CodeRedirect *redir, *next; |
| 275 | |
| 276 | if (VG_(clo_trace_redir)) |
| 277 | VG_(printf)("Considering redirs to/from %s(soname=%s)\n", |
| 278 | si->filename, si->soname); |
| 279 | |
| 280 | /* visit each unresolved redir - if it becomes resolved, then |
| 281 | remove it from the unresolved list */ |
| 282 | for(redir = unresolved_redir; redir != NULL; redir = next) { |
| 283 | next = redir->next; |
| 284 | |
| 285 | if (VG_(resolve_redir)(redir, si)) { |
| 286 | *prevp = next; |
| 287 | redir->next = NULL; |
| 288 | } else |
| 289 | prevp = &redir->next; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | /* Redirect a lib/symbol reference to a function at lib/symbol */ |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 294 | static void add_redirect_sym_to_sym(const Char *from_lib, const Char *from_sym, |
| 295 | const Char *to_lib, const Char *to_sym) |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 296 | { |
| 297 | CodeRedirect *redir = VG_(SkipNode_Alloc)(&sk_resolved_redir); |
| 298 | |
| 299 | redir->type = R_REDIRECT; |
| 300 | |
| 301 | redir->from_lib = VG_(arena_strdup)(VG_AR_SYMTAB, from_lib); |
| 302 | redir->from_sym = VG_(arena_strdup)(VG_AR_SYMTAB, from_sym); |
| 303 | redir->from_addr = 0; |
| 304 | |
| 305 | redir->to_lib = VG_(arena_strdup)(VG_AR_SYMTAB, to_lib); |
| 306 | redir->to_sym = VG_(arena_strdup)(VG_AR_SYMTAB, to_sym); |
| 307 | redir->to_addr = 0; |
| 308 | |
| 309 | if (VG_(clo_verbosity) >= 2 && VG_(clo_trace_redir)) |
| 310 | VG_(message)(Vg_UserMsg, |
| 311 | "REDIRECT %s(%s) to %s(%s)", |
| 312 | from_lib, from_sym, to_lib, to_sym); |
| 313 | |
| 314 | /* Check against all existing segments to see if this redirection |
| 315 | can be resolved immediately */ |
| 316 | if (!VG_(resolve_redir_allsegs)(redir)) { |
| 317 | /* nope, add to list */ |
| 318 | redir->next = unresolved_redir; |
| 319 | unresolved_redir = redir; |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /* Redirect a lib/symbol reference to a function at addr */ |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 324 | void VG_(add_redirect_sym_to_addr)(const Char *from_lib, const Char *from_sym, |
| 325 | Addr to_addr) |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 326 | { |
| 327 | CodeRedirect *redir = VG_(SkipNode_Alloc)(&sk_resolved_redir); |
| 328 | |
| 329 | redir->type = R_REDIRECT; |
| 330 | |
| 331 | redir->from_lib = VG_(arena_strdup)(VG_AR_SYMTAB, from_lib); |
| 332 | redir->from_sym = VG_(arena_strdup)(VG_AR_SYMTAB, from_sym); |
| 333 | redir->from_addr = 0; |
| 334 | |
| 335 | redir->to_lib = NULL; |
| 336 | redir->to_sym = NULL; |
| 337 | redir->to_addr = to_addr; |
| 338 | |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 339 | if (VG_(clo_verbosity) >= 2 && VG_(clo_trace_redir)) |
| 340 | VG_(message)(Vg_UserMsg, |
| 341 | "REDIRECT %s(%s) to %p", |
| 342 | from_lib, from_sym, to_addr); |
| 343 | |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 344 | /* Check against all existing segments to see if this redirection |
| 345 | can be resolved immediately */ |
| 346 | if (!VG_(resolve_redir_allsegs)(redir)) { |
| 347 | /* nope, add to list */ |
| 348 | redir->next = unresolved_redir; |
| 349 | unresolved_redir = redir; |
| 350 | } |
| 351 | } |
| 352 | |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 353 | /* Redirect a function at from_addr to a function at to_addr */ |
| 354 | void VG_(add_redirect_addr_to_addr)(Addr from_addr, Addr to_addr) |
| 355 | { |
| 356 | CodeRedirect *redir = VG_(SkipNode_Alloc)(&sk_resolved_redir); |
| 357 | |
| 358 | redir->type = R_REDIRECT; |
| 359 | |
| 360 | redir->from_lib = NULL; |
| 361 | redir->from_sym = NULL; |
| 362 | redir->from_addr = from_addr; |
| 363 | |
| 364 | redir->to_lib = NULL; |
| 365 | redir->to_sym = NULL; |
| 366 | redir->to_addr = to_addr; |
| 367 | |
| 368 | if (VG_(clo_verbosity) >= 2 && VG_(clo_trace_redir)) |
| 369 | VG_(message)(Vg_UserMsg, |
| 370 | "REDIRECT %p to %p", |
| 371 | from_addr, to_addr); |
| 372 | |
| 373 | add_resolved(redir); |
| 374 | } |
| 375 | |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 376 | CodeRedirect *VG_(add_wrapper)(const Char *from_lib, const Char *from_sym, |
| 377 | const FuncWrapper *wrapper) |
| 378 | { |
| 379 | CodeRedirect *redir = VG_(SkipNode_Alloc)(&sk_resolved_redir); |
| 380 | |
| 381 | if (0) |
| 382 | VG_(printf)("adding wrapper for %s:%s -> (%p,%p)\n", |
| 383 | from_lib, from_sym, wrapper->before, wrapper->after); |
| 384 | |
| 385 | redir->type = R_WRAPPER; |
| 386 | |
| 387 | redir->from_lib = VG_(arena_strdup)(VG_AR_SYMTAB, from_lib); |
| 388 | redir->from_sym = VG_(arena_strdup)(VG_AR_SYMTAB, from_sym); |
| 389 | redir->from_addr = 0; |
| 390 | |
| 391 | redir->to_lib = NULL; |
| 392 | redir->to_sym = NULL; |
| 393 | redir->to_addr = 0; |
| 394 | |
| 395 | redir->wrapper = wrapper; |
| 396 | |
| 397 | /* Check against all existing segments to see if this redirection |
| 398 | can be resolved immediately */ |
| 399 | if (!VG_(resolve_redir_allsegs)(redir)) { |
| 400 | /* nope, add to list */ |
| 401 | redir->next = unresolved_redir; |
| 402 | unresolved_redir = redir; |
| 403 | } |
| 404 | |
| 405 | return redir; |
| 406 | } |
| 407 | |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 408 | /* If address 'a' is being redirected, return the redirected-to |
| 409 | address. */ |
| 410 | Addr VG_(code_redirect)(Addr a) |
| 411 | { |
| 412 | CodeRedirect* r; |
| 413 | |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 414 | r = VG_(SkipList_Find_Exact)(&sk_resolved_redir, &a); |
| 415 | if (r == NULL) |
| 416 | return a; |
| 417 | |
| 418 | vg_assert(r->to_addr != 0); |
| 419 | |
| 420 | return r->to_addr; |
| 421 | } |
| 422 | |
| 423 | void VG_(setup_code_redirect_table) ( void ) |
| 424 | { |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 425 | /* Overenthusiastic use of PLT bypassing by the glibc people also |
| 426 | means we need to patch the following functions to our own |
| 427 | implementations of said, in mac_replace_strmem.c. |
| 428 | */ |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 429 | add_redirect_sym_to_sym("soname:libc.so.6", "stpcpy", |
| 430 | "*vgpreload_memcheck.so*", "stpcpy"); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 431 | |
sewardj | 9ea0901 | 2005-04-20 14:32:32 +0000 | [diff] [blame] | 432 | add_redirect_sym_to_sym("soname:ld-linux.so.2", "strlen", |
| 433 | "*vgpreload_memcheck.so*", "strlen"); |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 434 | add_redirect_sym_to_sym("soname:libc.so.6", "strlen", |
| 435 | "*vgpreload_memcheck.so*", "strlen"); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 436 | |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 437 | add_redirect_sym_to_sym("soname:libc.so.6", "strnlen", |
| 438 | "*vgpreload_memcheck.so*", "strnlen"); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 439 | |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 440 | add_redirect_sym_to_sym("soname:ld-linux.so.2", "stpcpy", |
| 441 | "*vgpreload_memcheck.so*", "stpcpy"); |
| 442 | add_redirect_sym_to_sym("soname:libc.so.6", "stpcpy", |
| 443 | "*vgpreload_memcheck.so*", "stpcpy"); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 444 | |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 445 | add_redirect_sym_to_sym("soname:libc.so.6", "strchr", |
| 446 | "*vgpreload_memcheck.so*", "strchr"); |
| 447 | add_redirect_sym_to_sym("soname:ld-linux.so.2", "strchr", |
| 448 | "*vgpreload_memcheck.so*", "strchr"); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 449 | |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 450 | add_redirect_sym_to_sym("soname:libc.so.6", "strchrnul", |
| 451 | "*vgpreload_memcheck.so*", "glibc232_strchrnul"); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 452 | |
tom | 748a131 | 2005-04-02 15:53:01 +0000 | [diff] [blame] | 453 | add_redirect_sym_to_sym("soname:libc.so.6", "rawmemchr", |
| 454 | "*vgpreload_memcheck.so*", "glibc232_rawmemchr"); |
sewardj | 7efe7be | 2005-04-25 17:08:32 +0000 | [diff] [blame] | 455 | |
| 456 | /* amd64-linux (glibc 2.3.3, SuSE 9.2) */ |
| 457 | /* apparently index is the same thing as strchr */ |
| 458 | add_redirect_sym_to_sym("soname:libc.so.6", "index", |
| 459 | "*vgpreload_memcheck.so*", "strchr"); |
sewardj | 86facbc | 2005-05-12 17:58:57 +0000 | [diff] [blame] | 460 | add_redirect_sym_to_sym("soname:ld-linux-x86-64.so.2", "index", |
| 461 | "*vgpreload_memcheck.so*", "strchr"); |
| 462 | |
| 463 | add_redirect_sym_to_sym("soname:libc.so.6", "strcpy", |
| 464 | "*vgpreload_memcheck.so*", "strcpy"); |
sewardj | 7efe7be | 2005-04-25 17:08:32 +0000 | [diff] [blame] | 465 | |
| 466 | add_redirect_sym_to_sym("soname:ld-linux-x86-64.so.2", "strcmp", |
| 467 | "*vgpreload_memcheck.so*", "strcmp"); |
| 468 | add_redirect_sym_to_sym("soname:libc.so.6", "strcmp", |
| 469 | "*vgpreload_memcheck.so*", "strcmp"); |
| 470 | |
| 471 | add_redirect_sym_to_sym("soname:ld-linux-x86-64.so.2", "strlen", |
| 472 | "*vgpreload_memcheck.so*", "strlen"); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | |
| 476 | //:: /*------------------------------------------------------------*/ |
| 477 | //:: /*--- General function wrapping. ---*/ |
| 478 | //:: /*------------------------------------------------------------*/ |
| 479 | //:: |
| 480 | //:: /* |
| 481 | //:: TODO: |
| 482 | //:: - hook into the symtab machinery |
| 483 | //:: - client-side wrappers? |
| 484 | //:: - better interfaces for before() functions to get to arguments |
| 485 | //:: - handle munmap of code (dlclose()) |
| 486 | //:: - handle thread exit |
| 487 | //:: - handle longjmp |
| 488 | //:: */ |
| 489 | //:: struct callkey { |
| 490 | //:: ThreadId tid; /* calling thread */ |
| 491 | //:: Addr esp; /* address of args on stack */ |
| 492 | //:: Addr eip; /* return address */ |
| 493 | //:: }; |
| 494 | //:: |
| 495 | //:: struct call_instance { |
| 496 | //:: struct callkey key; |
| 497 | //:: |
| 498 | //:: const FuncWrapper *wrapper; |
| 499 | //:: void *nonce; |
| 500 | //:: }; |
| 501 | //:: |
| 502 | //:: static inline Addr addrcmp(Addr a, Addr b) |
| 503 | //:: { |
| 504 | //:: if (a < b) |
| 505 | //:: return -1; |
| 506 | //:: else if (a > b) |
| 507 | //:: return 1; |
| 508 | //:: else |
| 509 | //:: return 0; |
| 510 | //:: } |
| 511 | //:: |
| 512 | //:: static inline Int cmp(UInt a, UInt b) |
| 513 | //:: { |
| 514 | //:: if (a < b) |
| 515 | //:: return -1; |
| 516 | //:: else if (a > b) |
| 517 | //:: return 1; |
| 518 | //:: else |
| 519 | //:: return 0; |
| 520 | //:: } |
| 521 | //:: |
| 522 | //:: static Int keycmp(const void *pa, const void *pb) |
| 523 | //:: { |
| 524 | //:: const struct callkey *a = (const struct callkey *)pa; |
| 525 | //:: const struct callkey *b = (const struct callkey *)pb; |
| 526 | //:: Int ret; |
| 527 | //:: |
| 528 | //:: if ((ret = cmp(a->tid, b->tid))) |
| 529 | //:: return ret; |
| 530 | //:: |
| 531 | //:: if ((ret = addrcmp(a->esp, b->esp))) |
| 532 | //:: return ret; |
| 533 | //:: |
| 534 | //:: return addrcmp(a->eip, b->eip); |
| 535 | //:: } |
| 536 | //:: |
| 537 | //:: /* List of wrapped call invocations which are currently active */ |
njn | be91aae | 2005-03-27 01:42:41 +0000 | [diff] [blame] | 538 | //:: static SkipList wrapped_frames = VG_SKIPLIST_INIT(struct call_instance, key, keycmp, |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 539 | //:: NULL, VG_AR_SYMTAB); |
| 540 | //:: |
| 541 | //:: static struct call_instance *find_call(Addr retaddr, Addr argsp, ThreadId tid) |
| 542 | //:: { |
| 543 | //:: struct callkey key = { tid, argsp, retaddr }; |
| 544 | //:: |
| 545 | //:: return VG_(SkipList_Find_Exact)(&wrapped_frames, &key); |
| 546 | //:: } |
| 547 | //:: |
| 548 | //:: static void wrapper_return(Addr retaddr); |
| 549 | //:: |
| 550 | //:: /* Called from generated code via helper */ |
| 551 | //:: void VG_(wrap_before)(ThreadState *tst, const FuncWrapper *wrapper) |
| 552 | //:: { |
njn | db9b773 | 2005-03-26 00:32:29 +0000 | [diff] [blame] | 553 | //:: Addr retaddr = VGA_RETADDR(tst->arch); |
| 554 | //:: Addr argp = (Addr)&VGA_FUNC_ARG(tst->arch, 0); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 555 | //:: void *nonce = NULL; |
| 556 | //:: Bool mf = VG_(my_fault); |
| 557 | //:: VG_(my_fault) = True; |
| 558 | //:: |
| 559 | //:: if (wrapper->before) { |
njn | db9b773 | 2005-03-26 00:32:29 +0000 | [diff] [blame] | 560 | //:: va_list args = VGA_VA_LIST(tst->arch); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 561 | //:: nonce = (*wrapper->before)(args); |
| 562 | //:: } |
| 563 | //:: |
| 564 | //:: if (wrapper->after) { |
| 565 | //:: /* If there's an after function, make sure it gets called */ |
| 566 | //:: struct call_instance *call; |
| 567 | //:: |
| 568 | //:: call = find_call(retaddr, argp, tst->tid); |
| 569 | //:: |
| 570 | //:: if (call != NULL) { |
| 571 | //:: /* Found a stale outstanding call; clean it up and recycle |
| 572 | //:: the structure */ |
| 573 | //:: if (call->wrapper->after) |
| 574 | //:: (*call->wrapper->after)(call->nonce, RT_LONGJMP, 0); |
| 575 | //:: } else { |
| 576 | //:: call = VG_(SkipNode_Alloc)(&wrapped_frames); |
| 577 | //:: |
| 578 | //:: call->key.tid = tst->tid; |
| 579 | //:: call->key.esp = argp; |
| 580 | //:: call->key.eip = retaddr; |
| 581 | //:: |
| 582 | //:: VG_(SkipList_Insert)(&wrapped_frames, call); |
| 583 | //:: |
| 584 | //:: wrapper_return(retaddr); |
| 585 | //:: } |
| 586 | //:: |
| 587 | //:: call->wrapper = wrapper; |
| 588 | //:: call->nonce = nonce; |
| 589 | //:: } else |
| 590 | //:: vg_assert(nonce == NULL); |
| 591 | //:: |
| 592 | //:: VG_(my_fault) = mf; |
| 593 | //:: } |
| 594 | //:: |
| 595 | //:: /* Called from generated code via helper */ |
| 596 | //:: void VG_(wrap_after)(ThreadState *tst) |
| 597 | //:: { |
njn | 35172bc | 2005-03-26 00:04:03 +0000 | [diff] [blame] | 598 | //:: Addr EIP = VGA_INSTR_PTR(tst->arch); /* instruction after call */ |
| 599 | //:: Addr ESP = VGA_STACK_PTR(tst->arch); /* pointer to args */ |
| 600 | //:: Word ret = VGA_RETVAL(tst->arch); /* return value */ |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 601 | //:: struct call_instance *call; |
| 602 | //:: Bool mf = VG_(my_fault); |
| 603 | //:: |
| 604 | //:: VG_(my_fault) = True; |
| 605 | //:: call = find_call(EIP, ESP, tst->tid); |
| 606 | //:: |
| 607 | //:: if (0) |
| 608 | //:: VG_(printf)("wrap_after(%p,%p,%d) -> %p\n", EIP, ESP, tst->tid, call); |
| 609 | //:: |
| 610 | //:: if (call != NULL) { |
| 611 | //:: if (call->wrapper->after) |
| 612 | //:: (*call->wrapper->after)(call->nonce, RT_RETURN, ret); |
| 613 | //:: |
| 614 | //:: VG_(SkipList_Remove)(&wrapped_frames, &call->key); |
| 615 | //:: VG_(SkipNode_Free)(&wrapped_frames, call); |
| 616 | //:: } |
| 617 | //:: VG_(my_fault) = mf; |
| 618 | //:: } |
| 619 | //:: |
| 620 | //:: |
| 621 | //:: struct wrapped_function { |
| 622 | //:: Addr eip; /* eip of function entrypoint */ |
| 623 | //:: const FuncWrapper *wrapper; |
| 624 | //:: }; |
| 625 | //:: |
| 626 | //:: struct wrapper_return { |
| 627 | //:: Addr eip; /* return address */ |
| 628 | //:: }; |
| 629 | //:: |
| 630 | //:: /* A mapping from eip of wrapped function entrypoints to actual wrappers */ |
njn | be91aae | 2005-03-27 01:42:41 +0000 | [diff] [blame] | 631 | //:: static SkipList wrapped_functions = VG_SKIPLIST_INIT(struct wrapped_function, eip, VG_(cmp_Addr), |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 632 | //:: NULL, VG_AR_SYMTAB); |
| 633 | //:: |
| 634 | //:: /* A set of EIPs which are return addresses for wrapped functions */ |
njn | be91aae | 2005-03-27 01:42:41 +0000 | [diff] [blame] | 635 | //:: static SkipList wrapper_returns = VG_SKIPLIST_INIT(struct wrapper_return, eip, VG_(cmp_Addr), |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 636 | //:: NULL, VG_AR_SYMTAB); |
| 637 | //:: |
| 638 | //:: /* Wrap function starting at eip */ |
| 639 | //:: void VG_(wrap_function)(Addr eip, const FuncWrapper *wrapper) |
| 640 | //:: { |
| 641 | //:: struct wrapped_function *func; |
| 642 | //:: |
| 643 | //:: if (0) |
| 644 | //:: VG_(printf)("wrapping %p with (%p,%p)\n", eip, wrapper->before, wrapper->after); |
| 645 | //:: |
| 646 | //:: func = VG_(SkipList_Find_Exact)(&wrapped_functions, &eip); |
| 647 | //:: |
| 648 | //:: if (func == NULL) { |
| 649 | //:: func = VG_(SkipNode_Alloc)(&wrapped_functions); |
| 650 | //:: VG_(invalidate_translations)(eip, 1, True); |
| 651 | //:: |
| 652 | //:: func->eip = eip; |
| 653 | //:: VG_(SkipList_Insert)(&wrapped_functions, func); |
| 654 | //:: } |
| 655 | //:: |
| 656 | //:: func->wrapper = wrapper; |
| 657 | //:: } |
| 658 | //:: |
| 659 | //:: const FuncWrapper *VG_(is_wrapped)(Addr eip) |
| 660 | //:: { |
| 661 | //:: struct wrapped_function *func = VG_(SkipList_Find_Exact)(&wrapped_functions, &eip); |
| 662 | //:: |
| 663 | //:: if (func) |
| 664 | //:: return func->wrapper; |
| 665 | //:: return NULL; |
| 666 | //:: } |
| 667 | //:: |
| 668 | //:: Bool VG_(is_wrapper_return)(Addr eip) |
| 669 | //:: { |
| 670 | //:: struct wrapper_return *ret = VG_(SkipList_Find_Exact)(&wrapper_returns, &eip); |
| 671 | //:: |
| 672 | //:: return ret != NULL; |
| 673 | //:: } |
| 674 | //:: |
| 675 | //:: /* Mark eip as being the return address of a wrapper, so that the |
| 676 | //:: codegen will generate the appropriate call. */ |
| 677 | //:: void wrapper_return(Addr eip) |
| 678 | //:: { |
| 679 | //:: struct wrapper_return *ret; |
| 680 | //:: |
| 681 | //:: if (VG_(is_wrapper_return)(eip)) |
| 682 | //:: return; |
| 683 | //:: |
| 684 | //:: VG_(invalidate_translations)(eip, 1, True); |
| 685 | //:: |
| 686 | //:: ret = VG_(SkipNode_Alloc)(&wrapper_returns); |
| 687 | //:: ret->eip = eip; |
| 688 | //:: |
| 689 | //:: VG_(SkipList_Insert)(&wrapper_returns, ret); |
| 690 | //:: } |