tccrun.c

   1 /*
   2  *  TCC - Tiny C Compiler - Support for -run switch
   3  *
   4  *  Copyright (c) 2001-2004 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "tcc.h"
  22
  23 /* only native compiler supports -run */
  24 #ifdef TCC_IS_NATIVE
  25
  26 #ifdef CONFIG_TCC_BACKTRACE
  27 ST_DATA int rt_num_callers = 6;
  28 ST_DATA const char **rt_bound_error_msg;
  29 ST_DATA void *rt_prog_main;
  30 #endif
  31
  32 #ifdef _WIN32
  33 #define ucontext_t CONTEXT
  34 #endif
  35
  36 static void set_pages_executable(void *ptr, unsigned long length);
  37 static void set_exception_handler(void);
  38 static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level);
  39 static void rt_error(ucontext_t *uc, const char *fmt, ...);
  40 static int tcc_relocate_ex(TCCState *s1, void *ptr);
  41
  42 #ifdef _WIN64
  43 static void win64_add_function_table(TCCState *s1);
  44 #endif
  45
  46 /* ------------------------------------------------------------- */
  47 /* Do all relocations (needed before using tcc_get_symbol())
  48    Returns -1 on error. */
  49
  50 LIBTCCAPI int tcc_relocate(TCCState *s1, void *ptr)
  51 {
  52     int ret;
  53
  54     if (TCC_RELOCATE_AUTO != ptr)
  55         return tcc_relocate_ex(s1, ptr);
  56
  57     ret = tcc_relocate_ex(s1, NULL);
  58     if (ret < 0)
  59         return ret;
  60
  61 #ifdef HAVE_SELINUX
  62     {   /* Use mmap instead of malloc for Selinux.  Ref:
  63            http://www.gnu.org/s/libc/manual/html_node/File-Size.html */
  64
  65         char tmpfname[] = "/tmp/.tccrunXXXXXX";
  66         int fd = mkstemp (tmpfname);
  67
  68         s1->mem_size = ret;
  69         unlink (tmpfname);
  70         ftruncate (fd, s1->mem_size);
  71
  72         s1->write_mem = mmap (NULL, ret, PROT_READ|PROT_WRITE,
  73             MAP_SHARED, fd, 0);
  74         if (s1->write_mem == MAP_FAILED)
  75             tcc_error("/tmp not writeable");
  76
  77         s1->runtime_mem = mmap (NULL, ret, PROT_READ|PROT_EXEC,
  78             MAP_SHARED, fd, 0);
  79         if (s1->runtime_mem == MAP_FAILED)
  80             tcc_error("/tmp not executable");
  81
  82         ret = tcc_relocate_ex(s1, s1->write_mem);
  83     }
  84 #else
  85     s1->runtime_mem = tcc_malloc(ret);
  86     ret = tcc_relocate_ex(s1, s1->runtime_mem);
  87 #endif
  88     return ret;
  89 }
  90
  91 /* launch the compiled program with the given arguments */
  92 LIBTCCAPI int tcc_run(TCCState *s1, int argc, char **argv)
  93 {
  94     int (*prog_main)(int, char **);
  95     int ret;
  96
  97     if (tcc_relocate(s1, TCC_RELOCATE_AUTO) < 0)
  98         return -1;
  99
 100     prog_main = tcc_get_symbol_err(s1, s1->runtime_main);
 101
 102 #ifdef CONFIG_TCC_BACKTRACE
 103     if (s1->do_debug) {
 104         set_exception_handler();
 105         rt_prog_main = prog_main;
 106     }
 107 #endif
 108
 109 #ifdef CONFIG_TCC_BCHECK
 110     if (s1->do_bounds_check) {
 111         void (*bound_init)(void);
 112         void (*bound_exit)(void);
 113         void (*bound_new_region)(void *p, unsigned long size);
 114         int  (*bound_delete_region)(void *p);
 115         int i;
 116
 117         /* set error function */
 118         rt_bound_error_msg = tcc_get_symbol_err(s1, "__bound_error_msg");
 119         /* XXX: use .init section so that it also work in binary ? */
 120         bound_init = tcc_get_symbol_err(s1, "__bound_init");
 121         bound_exit = tcc_get_symbol_err(s1, "__bound_exit");
 122         bound_new_region = tcc_get_symbol_err(s1, "__bound_new_region");
 123         bound_delete_region = tcc_get_symbol_err(s1, "__bound_delete_region");
 124         bound_init();
 125         /* mark argv area as valid */
 126         bound_new_region(argv, argc*sizeof(argv[0]));
 127         for (i=0; i<argc; ++i)
 128             bound_new_region(argv[i], strlen(argv[i]));
 129
 130         ret = (*prog_main)(argc, argv);
 131
 132         /* unmark argv area */
 133         for (i=0; i<argc; ++i)
 134             bound_delete_region(argv[i]);
 135         bound_delete_region(argv);
 136
 137         bound_exit();
 138     } else
 139 #endif
 140         ret = (*prog_main)(argc, argv);
 141     return ret;
 142 }
 143
 144 /* relocate code. Return -1 on error, required size if ptr is NULL,
 145    otherwise copy code into buffer passed by the caller */
 146 static int tcc_relocate_ex(TCCState *s1, void *ptr)
 147 {
 148     Section *s;
 149     unsigned long offset, length;
 150     addr_t mem;
 151     int i;
 152
 153     if (NULL == ptr) {
 154         s1->nb_errors = 0;
 155 #ifdef TCC_TARGET_PE
 156         pe_output_file(s1, NULL);
 157 #else
 158         tcc_add_runtime(s1);
 159         relocate_common_syms();
 160         tcc_add_linker_symbols(s1);
 161         build_got_entries(s1);
 162 #endif
 163         if (s1->nb_errors)
 164             return -1;
 165     }
 166
 167     offset = 0, mem = (addr_t)ptr;
 168     for(i = 1; i < s1->nb_sections; i++) {
 169         s = s1->sections[i];
 170         if (0 == (s->sh_flags & SHF_ALLOC))
 171             continue;
 172         length = s->data_offset;
 173         s->sh_addr = mem ? (mem + offset + 15) & ~15 : 0;
 174         offset = (offset + length + 15) & ~15;
 175     }
 176     offset += 16;
 177
 178     /* relocate symbols */
 179     relocate_syms(s1, 1);
 180     if (s1->nb_errors)
 181         return -1;
 182
 183 #ifdef TCC_HAS_RUNTIME_PLTGOT
 184     s1->runtime_plt_and_got_offset = 0;
 185     s1->runtime_plt_and_got = (char *)(mem + offset);
 186     /* double the size of the buffer for got and plt entries
 187        XXX: calculate exact size for them? */
 188     offset *= 2;
 189 #endif
 190
 191     if (0 == mem)
 192         return offset;
 193
 194     /* relocate each section */
 195     for(i = 1; i < s1->nb_sections; i++) {
 196         s = s1->sections[i];
 197         if (s->reloc)
 198             relocate_section(s1, s);
 199     }
 200
 201     for(i = 1; i < s1->nb_sections; i++) {
 202         s = s1->sections[i];
 203         if (0 == (s->sh_flags & SHF_ALLOC))
 204             continue;
 205         length = s->data_offset;
 206         // printf("%-12s %08x %04x\n", s->name, s->sh_addr, length);
 207         ptr = (void*)s->sh_addr;
 208         if (NULL == s->data || s->sh_type == SHT_NOBITS)
 209             memset(ptr, 0, length);
 210         else
 211             memcpy(ptr, s->data, length);
 212         /* mark executable sections as executable in memory */
 213         if (s->sh_flags & SHF_EXECINSTR)
 214             set_pages_executable(ptr, length);
 215     }
 216
 217 #ifdef TCC_HAS_RUNTIME_PLTGOT
 218     set_pages_executable(s1->runtime_plt_and_got,
 219                          s1->runtime_plt_and_got_offset);
 220 #endif
 221
 222 #ifdef _WIN64
 223     win64_add_function_table(s1);
 224 #endif
 225     return 0;
 226 }
 227
 228 /* ------------------------------------------------------------- */
 229 /* allow to run code in memory */
 230
 231 static void set_pages_executable(void *ptr, unsigned long length)
 232 {
 233 #ifdef _WIN32
 234     unsigned long old_protect;
 235     VirtualProtect(ptr, length, PAGE_EXECUTE_READWRITE, &old_protect);
 236 #else
 237 #ifndef PAGESIZE
 238 # define PAGESIZE 4096
 239 #endif
 240     addr_t start, end;
 241     start = (addr_t)ptr & ~(PAGESIZE - 1);
 242     end = (addr_t)ptr + length;
 243     end = (end + PAGESIZE - 1) & ~(PAGESIZE - 1);
 244     mprotect((void *)start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC);
 245     __clear_cache(ptr, ptr + length);
 246 #endif
 247 }
 248
 249 /* ------------------------------------------------------------- */
 250 #ifdef CONFIG_TCC_BACKTRACE
 251
 252 ST_FUNC void tcc_set_num_callers(int n)
 253 {
 254     rt_num_callers = n;
 255 }
 256
 257 /* print the position in the source file of PC value 'pc' by reading
 258    the stabs debug information */
 259 static addr_t rt_printline(addr_t wanted_pc, const char *msg)
 260 {
 261     char func_name[128], last_func_name[128];
 262     addr_t func_addr, last_pc, pc;
 263     const char *incl_files[INCLUDE_STACK_SIZE];
 264     int incl_index, len, last_line_num, i;
 265     const char *str, *p;
 266
 267     Stab_Sym *stab_sym = NULL, *stab_sym_end, *sym;
 268     int stab_len = 0;
 269     char *stab_str = NULL;
 270
 271     if (stab_section) {
 272         stab_len = stab_section->data_offset;
 273         stab_sym = (Stab_Sym *)stab_section->data;
 274         stab_str = stabstr_section->data;
 275     }
 276
 277     func_name[0] = '\0';
 278     func_addr = 0;
 279     incl_index = 0;
 280     last_func_name[0] = '\0';
 281     last_pc = (addr_t)-1;
 282     last_line_num = 1;
 283
 284     if (!stab_sym)
 285         goto no_stabs;
 286
 287     stab_sym_end = (Stab_Sym*)((char*)stab_sym + stab_len);
 288     for (sym = stab_sym + 1; sym < stab_sym_end; ++sym) {
 289         switch(sym->n_type) {
 290             /* function start or end */
 291         case N_FUN:
 292             if (sym->n_strx == 0) {
 293                 /* we test if between last line and end of function */
 294                 pc = sym->n_value + func_addr;
 295                 if (wanted_pc >= last_pc && wanted_pc < pc)
 296                     goto found;
 297                 func_name[0] = '\0';
 298                 func_addr = 0;
 299             } else {
 300                 str = stab_str + sym->n_strx;
 301                 p = strchr(str, ':');
 302                 if (!p) {
 303                     pstrcpy(func_name, sizeof(func_name), str);
 304                 } else {
 305                     len = p - str;
 306                     if (len > sizeof(func_name) - 1)
 307                         len = sizeof(func_name) - 1;
 308                     memcpy(func_name, str, len);
 309                     func_name[len] = '\0';
 310                 }
 311                 func_addr = sym->n_value;
 312             }
 313             break;
 314             /* line number info */
 315         case N_SLINE:
 316             pc = sym->n_value + func_addr;
 317             if (wanted_pc >= last_pc && wanted_pc < pc)
 318                 goto found;
 319             last_pc = pc;
 320             last_line_num = sym->n_desc;
 321             /* XXX: slow! */
 322             strcpy(last_func_name, func_name);
 323             break;
 324             /* include files */
 325         case N_BINCL:
 326             str = stab_str + sym->n_strx;
 327         add_incl:
 328             if (incl_index < INCLUDE_STACK_SIZE) {
 329                 incl_files[incl_index++] = str;
 330             }
 331             break;
 332         case N_EINCL:
 333             if (incl_index > 1)
 334                 incl_index--;
 335             break;
 336         case N_SO:
 337             if (sym->n_strx == 0) {
 338                 incl_index = 0; /* end of translation unit */
 339             } else {
 340                 str = stab_str + sym->n_strx;
 341                 /* do not add path */
 342                 len = strlen(str);
 343                 if (len > 0 && str[len - 1] != '/')
 344                     goto add_incl;
 345             }
 346             break;
 347         }
 348     }
 349
 350 no_stabs:
 351     /* second pass: we try symtab symbols (no line number info) */
 352     incl_index = 0;
 353     if (symtab_section)
 354     {
 355         ElfW(Sym) *sym, *sym_end;
 356         int type;
 357
 358         sym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset);
 359         for(sym = (ElfW(Sym) *)symtab_section->data + 1;
 360             sym < sym_end;
 361             sym++) {
 362             type = ELFW(ST_TYPE)(sym->st_info);
 363             if (type == STT_FUNC || type == STT_GNU_IFUNC) {
 364                 if (wanted_pc >= sym->st_value &&
 365                     wanted_pc < sym->st_value + sym->st_size) {
 366                     pstrcpy(last_func_name, sizeof(last_func_name),
 367                             strtab_section->data + sym->st_name);
 368                     func_addr = sym->st_value;
 369                     goto found;
 370                 }
 371             }
 372         }
 373     }
 374     /* did not find any info: */
 375     fprintf(stderr, "%s %p ???\n", msg, (void*)wanted_pc);
 376     fflush(stderr);
 377     return 0;
 378  found:
 379     i = incl_index;
 380     if (i > 0)
 381         fprintf(stderr, "%s:%d: ", incl_files[--i], last_line_num);
 382     fprintf(stderr, "%s %p", msg, (void*)wanted_pc);
 383     if (last_func_name[0] != '\0')
 384         fprintf(stderr, " %s()", last_func_name);
 385     if (--i >= 0) {
 386         fprintf(stderr, " (included from ");
 387         for (;;) {
 388             fprintf(stderr, "%s", incl_files[i]);
 389             if (--i < 0)
 390                 break;
 391             fprintf(stderr, ", ");
 392         }
 393         fprintf(stderr, ")");
 394     }
 395     fprintf(stderr, "\n");
 396     fflush(stderr);
 397     return func_addr;
 398 }
 399
 400 /* emit a run time error at position 'pc' */
 401 static void rt_error(ucontext_t *uc, const char *fmt, ...)
 402 {
 403     va_list ap;
 404     addr_t pc;
 405     int i;
 406
 407     fprintf(stderr, "Runtime error: ");
 408     va_start(ap, fmt);
 409     vfprintf(stderr, fmt, ap);
 410     va_end(ap);
 411     fprintf(stderr, "\n");
 412
 413     for(i=0;i<rt_num_callers;i++) {
 414         if (rt_get_caller_pc(&pc, uc, i) < 0)
 415             break;
 416         pc = rt_printline(pc, i ? "by" : "at");
 417         if (pc == (addr_t)rt_prog_main && pc)
 418             break;
 419     }
 420 }
 421
 422 /* ------------------------------------------------------------- */
 423 #ifndef _WIN32
 424
 425 /* signal handler for fatal errors */
 426 static void sig_error(int signum, siginfo_t *siginf, void *puc)
 427 {
 428     ucontext_t *uc = puc;
 429
 430     switch(signum) {
 431     case SIGFPE:
 432         switch(siginf->si_code) {
 433         case FPE_INTDIV:
 434         case FPE_FLTDIV:
 435             rt_error(uc, "division by zero");
 436             break;
 437         default:
 438             rt_error(uc, "floating point exception");
 439             break;
 440         }
 441         break;
 442     case SIGBUS:
 443     case SIGSEGV:
 444         if (rt_bound_error_msg && *rt_bound_error_msg)
 445             rt_error(uc, *rt_bound_error_msg);
 446         else
 447             rt_error(uc, "dereferencing invalid pointer");
 448         break;
 449     case SIGILL:
 450         rt_error(uc, "illegal instruction");
 451         break;
 452     case SIGABRT:
 453         rt_error(uc, "abort() called");
 454         break;
 455     default:
 456         rt_error(uc, "caught signal %d", signum);
 457         break;
 458     }
 459     exit(255);
 460 }
 461
 462 #ifndef SA_SIGINFO
 463 # define SA_SIGINFO 0x00000004u
 464 #endif
 465
 466 /* Generate a stack backtrace when a CPU exception occurs. */
 467 static void set_exception_handler(void)
 468 {
 469     struct sigaction sigact;
 470     /* install TCC signal handlers to print debug info on fatal
 471        runtime errors */
 472     sigact.sa_flags = SA_SIGINFO | SA_RESETHAND;
 473     sigact.sa_sigaction = sig_error;
 474     sigemptyset(&sigact.sa_mask);
 475     sigaction(SIGFPE, &sigact, NULL);
 476     sigaction(SIGILL, &sigact, NULL);
 477     sigaction(SIGSEGV, &sigact, NULL);
 478     sigaction(SIGBUS, &sigact, NULL);
 479     sigaction(SIGABRT, &sigact, NULL);
 480 }
 481
 482 /* ------------------------------------------------------------- */
 483 #ifdef __i386__
 484
 485 /* fix for glibc 2.1 */
 486 #ifndef REG_EIP
 487 #define REG_EIP EIP
 488 #define REG_EBP EBP
 489 #endif
 490
 491 /* return the PC at frame level 'level'. Return negative if not found */
 492 static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
 493 {
 494     addr_t fp;
 495     int i;
 496
 497     if (level == 0) {
 498 #if defined(__APPLE__)
 499         *paddr = uc->uc_mcontext->__ss.__eip;
 500 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 501         *paddr = uc->uc_mcontext.mc_eip;
 502 #elif defined(__dietlibc__)
 503         *paddr = uc->uc_mcontext.eip;
 504 #else
 505         *paddr = uc->uc_mcontext.gregs[REG_EIP];
 506 #endif
 507         return 0;
 508     } else {
 509 #if defined(__APPLE__)
 510         fp = uc->uc_mcontext->__ss.__ebp;
 511 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 512         fp = uc->uc_mcontext.mc_ebp;
 513 #elif defined(__dietlibc__)
 514         fp = uc->uc_mcontext.ebp;
 515 #else
 516         fp = uc->uc_mcontext.gregs[REG_EBP];
 517 #endif
 518         for(i=1;i<level;i++) {
 519             /* XXX: check address validity with program info */
 520             if (fp <= 0x1000 || fp >= 0xc0000000)
 521                 return -1;
 522             fp = ((addr_t *)fp)[0];
 523         }
 524         *paddr = ((addr_t *)fp)[1];
 525         return 0;
 526     }
 527 }
 528
 529 /* ------------------------------------------------------------- */
 530 #elif defined(__x86_64__)
 531
 532 /* return the PC at frame level 'level'. Return negative if not found */
 533 static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
 534 {
 535     addr_t fp;
 536     int i;
 537
 538     if (level == 0) {
 539         /* XXX: only support linux */
 540 #if defined(__APPLE__)
 541         *paddr = uc->uc_mcontext->__ss.__rip;
 542 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 543         *paddr = uc->uc_mcontext.mc_rip;
 544 #else
 545         *paddr = uc->uc_mcontext.gregs[REG_RIP];
 546 #endif
 547         return 0;
 548     } else {
 549 #if defined(__APPLE__)
 550         fp = uc->uc_mcontext->__ss.__rbp;
 551 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 552         fp = uc->uc_mcontext.mc_rbp;
 553 #else
 554         fp = uc->uc_mcontext.gregs[REG_RBP];
 555 #endif
 556         for(i=1;i<level;i++) {
 557             /* XXX: check address validity with program info */
 558             if (fp <= 0x1000)
 559                 return -1;
 560             fp = ((addr_t *)fp)[0];
 561         }
 562         *paddr = ((addr_t *)fp)[1];
 563         return 0;
 564     }
 565 }
 566
 567 /* ------------------------------------------------------------- */
 568 #elif defined(__arm__)
 569
 570 /* return the PC at frame level 'level'. Return negative if not found */
 571 static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
 572 {
 573     addr_t fp, sp;
 574     int i;
 575
 576     if (level == 0) {
 577         /* XXX: only supports linux */
 578 #if defined(__linux__)
 579         *paddr = uc->uc_mcontext.arm_pc;
 580 #else
 581         return -1;
 582 #endif
 583         return 0;
 584     } else {
 585 #if defined(__linux__)
 586         fp = uc->uc_mcontext.arm_fp;
 587         sp = uc->uc_mcontext.arm_sp;
 588         if (sp < 0x1000)
 589             sp = 0x1000;
 590 #else
 591         return -1;
 592 #endif
 593         /* XXX: specific to tinycc stack frames */
 594         if (fp < sp + 12 || fp & 3)
 595             return -1;
 596         for(i = 1; i < level; i++) {
 597             sp = ((addr_t *)fp)[-2];
 598             if (sp < fp || sp - fp > 16 || sp & 3)
 599                 return -1;
 600             fp = ((addr_t *)fp)[-3];
 601             if (fp <= sp || fp - sp < 12 || fp & 3)
 602                 return -1;
 603         }
 604         /* XXX: check address validity with program info */
 605         *paddr = ((addr_t *)fp)[-1];
 606         return 0;
 607     }
 608 }
 609
 610 /* ------------------------------------------------------------- */
 611 #else
 612
 613 #warning add arch specific rt_get_caller_pc()
 614 static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
 615 {
 616     return -1;
 617 }
 618
 619 #endif /* !__i386__ */
 620
 621 /* ------------------------------------------------------------- */
 622 #else /* WIN32 */
 623
 624 static long __stdcall cpu_exception_handler(EXCEPTION_POINTERS *ex_info)
 625 {
 626     EXCEPTION_RECORD *er = ex_info->ExceptionRecord;
 627     CONTEXT *uc = ex_info->ContextRecord;
 628     switch (er->ExceptionCode) {
 629     case EXCEPTION_ACCESS_VIOLATION:
 630         if (rt_bound_error_msg && *rt_bound_error_msg)
 631             rt_error(uc, *rt_bound_error_msg);
 632         else
 633             rt_error(uc, "access violation");
 634         break;
 635     case EXCEPTION_STACK_OVERFLOW:
 636         rt_error(uc, "stack overflow");
 637         break;
 638     case EXCEPTION_INT_DIVIDE_BY_ZERO:
 639         rt_error(uc, "division by zero");
 640         break;
 641     default:
 642         rt_error(uc, "exception caught");
 643         break;
 644     }
 645     return EXCEPTION_EXECUTE_HANDLER;
 646 }
 647
 648 /* Generate a stack backtrace when a CPU exception occurs. */
 649 static void set_exception_handler(void)
 650 {
 651     SetUnhandledExceptionFilter(cpu_exception_handler);
 652 }
 653
 654 #ifdef _WIN64
 655 static void win64_add_function_table(TCCState *s1)
 656 {
 657     RtlAddFunctionTable(
 658         (RUNTIME_FUNCTION*)s1->uw_pdata->sh_addr,
 659         s1->uw_pdata->data_offset / sizeof (RUNTIME_FUNCTION),
 660         text_section->sh_addr
 661         );
 662 }
 663 #endif
 664
 665 /* return the PC at frame level 'level'. Return non zero if not found */
 666 static int rt_get_caller_pc(addr_t *paddr, CONTEXT *uc, int level)
 667 {
 668     addr_t fp, pc;
 669     int i;
 670 #ifdef _WIN64
 671     pc = uc->Rip;
 672     fp = uc->Rbp;
 673 #else
 674     pc = uc->Eip;
 675     fp = uc->Ebp;
 676 #endif
 677     if (level > 0) {
 678         for(i=1;i<level;i++) {
 679             /* XXX: check address validity with program info */
 680             if (fp <= 0x1000 || fp >= 0xc0000000)
 681                 return -1;
 682             fp = ((addr_t*)fp)[0];
 683         }
 684         pc = ((addr_t*)fp)[1];
 685     }
 686     *paddr = pc;
 687     return 0;
 688 }
 689
 690 #endif /* _WIN32 */
 691 #endif /* CONFIG_TCC_BACKTRACE */
 692 /* ------------------------------------------------------------- */
 693 #ifdef CONFIG_TCC_STATIC
 694
 695 /* dummy function for profiling */
 696 ST_FUNC void *dlopen(const char *filename, int flag)
 697 {
 698     return NULL;
 699 }
 700
 701 ST_FUNC void dlclose(void *p)
 702 {
 703 }
 704
 705 ST_FUNC const char *dlerror(void)
 706 {
 707     return "error";
 708 }
 709
 710 typedef struct TCCSyms {
 711     char *str;
 712     void *ptr;
 713 } TCCSyms;
 714
 715
 716 /* add the symbol you want here if no dynamic linking is done */
 717 static TCCSyms tcc_syms[] = {
 718 #if !defined(CONFIG_TCCBOOT)
 719 #define TCCSYM(a) { #a, &a, },
 720     TCCSYM(printf)
 721     TCCSYM(fprintf)
 722     TCCSYM(fopen)
 723     TCCSYM(fclose)
 724 #undef TCCSYM
 725 #endif
 726     { NULL, NULL },
 727 };
 728
 729 ST_FUNC void *resolve_sym(TCCState *s1, const char *symbol)
 730 {
 731     TCCSyms *p;
 732     p = tcc_syms;
 733     while (p->str != NULL) {
 734         if (!strcmp(p->str, symbol))
 735             return p->ptr;
 736         p++;
 737     }
 738     return NULL;
 739 }
 740
 741 #elif !defined(_WIN32)
 742
 743 ST_FUNC void *resolve_sym(TCCState *s1, const char *sym)
 744 {
 745     return dlsym(RTLD_DEFAULT, sym);
 746 }
 747
 748 #endif /* CONFIG_TCC_STATIC */
 749 #endif /* TCC_IS_NATIVE */
 750 /* ------------------------------------------------------------- */