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     extern void __clear_cache(char *beginning, char *end);
 238 #ifndef PAGESIZE
 239 # define PAGESIZE 4096
 240 #endif
 241     addr_t start, end;
 242     start = (addr_t)ptr & ~(PAGESIZE - 1);
 243     end = (addr_t)ptr + length;
 244     end = (end + PAGESIZE - 1) & ~(PAGESIZE - 1);
 245     mprotect((void *)start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC);
 246     __clear_cache(ptr, ptr + length);
 247 #endif
 248 }
 249
 250 /* ------------------------------------------------------------- */
 251 #ifdef CONFIG_TCC_BACKTRACE
 252
 253 ST_FUNC void tcc_set_num_callers(int n)
 254 {
 255     rt_num_callers = n;
 256 }
 257
 258 /* print the position in the source file of PC value 'pc' by reading
 259    the stabs debug information */
 260 static addr_t rt_printline(addr_t wanted_pc, const char *msg)
 261 {
 262     char func_name[128], last_func_name[128];
 263     addr_t func_addr, last_pc, pc;
 264     const char *incl_files[INCLUDE_STACK_SIZE];
 265     int incl_index, len, last_line_num, i;
 266     const char *str, *p;
 267
 268     Stab_Sym *stab_sym = NULL, *stab_sym_end, *sym;
 269     int stab_len = 0;
 270     char *stab_str = NULL;
 271
 272     if (stab_section) {
 273         stab_len = stab_section->data_offset;
 274         stab_sym = (Stab_Sym *)stab_section->data;
 275         stab_str = (char *) stabstr_section->data;
 276     }
 277
 278     func_name[0] = '\0';
 279     func_addr = 0;
 280     incl_index = 0;
 281     last_func_name[0] = '\0';
 282     last_pc = (addr_t)-1;
 283     last_line_num = 1;
 284
 285     if (!stab_sym)
 286         goto no_stabs;
 287
 288     stab_sym_end = (Stab_Sym*)((char*)stab_sym + stab_len);
 289     for (sym = stab_sym + 1; sym < stab_sym_end; ++sym) {
 290         switch(sym->n_type) {
 291             /* function start or end */
 292         case N_FUN:
 293             if (sym->n_strx == 0) {
 294                 /* we test if between last line and end of function */
 295                 pc = sym->n_value + func_addr;
 296                 if (wanted_pc >= last_pc && wanted_pc < pc)
 297                     goto found;
 298                 func_name[0] = '\0';
 299                 func_addr = 0;
 300             } else {
 301                 str = stab_str + sym->n_strx;
 302                 p = strchr(str, ':');
 303                 if (!p) {
 304                     pstrcpy(func_name, sizeof(func_name), str);
 305                 } else {
 306                     len = p - str;
 307                     if (len > sizeof(func_name) - 1)
 308                         len = sizeof(func_name) - 1;
 309                     memcpy(func_name, str, len);
 310                     func_name[len] = '\0';
 311                 }
 312                 func_addr = sym->n_value;
 313             }
 314             break;
 315             /* line number info */
 316         case N_SLINE:
 317             pc = sym->n_value + func_addr;
 318             if (wanted_pc >= last_pc && wanted_pc < pc)
 319                 goto found;
 320             last_pc = pc;
 321             last_line_num = sym->n_desc;
 322             /* XXX: slow! */
 323             strcpy(last_func_name, func_name);
 324             break;
 325             /* include files */
 326         case N_BINCL:
 327             str = stab_str + sym->n_strx;
 328         add_incl:
 329             if (incl_index < INCLUDE_STACK_SIZE) {
 330                 incl_files[incl_index++] = str;
 331             }
 332             break;
 333         case N_EINCL:
 334             if (incl_index > 1)
 335                 incl_index--;
 336             break;
 337         case N_SO:
 338             if (sym->n_strx == 0) {
 339                 incl_index = 0; /* end of translation unit */
 340             } else {
 341                 str = stab_str + sym->n_strx;
 342                 /* do not add path */
 343                 len = strlen(str);
 344                 if (len > 0 && str[len - 1] != '/')
 345                     goto add_incl;
 346             }
 347             break;
 348         }
 349     }
 350
 351 no_stabs:
 352     /* second pass: we try symtab symbols (no line number info) */
 353     incl_index = 0;
 354     if (symtab_section)
 355     {
 356         ElfW(Sym) *sym, *sym_end;
 357         int type;
 358
 359         sym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset);
 360         for(sym = (ElfW(Sym) *)symtab_section->data + 1;
 361             sym < sym_end;
 362             sym++) {
 363             type = ELFW(ST_TYPE)(sym->st_info);
 364             if (type == STT_FUNC || type == STT_GNU_IFUNC) {
 365                 if (wanted_pc >= sym->st_value &&
 366                     wanted_pc < sym->st_value + sym->st_size) {
 367                     pstrcpy(last_func_name, sizeof(last_func_name),
 368                             (char *) strtab_section->data + sym->st_name);
 369                     func_addr = sym->st_value;
 370                     goto found;
 371                 }
 372             }
 373         }
 374     }
 375     /* did not find any info: */
 376     fprintf(stderr, "%s %p ???\n", msg, (void*)wanted_pc);
 377     fflush(stderr);
 378     return 0;
 379  found:
 380     i = incl_index;
 381     if (i > 0)
 382         fprintf(stderr, "%s:%d: ", incl_files[--i], last_line_num);
 383     fprintf(stderr, "%s %p", msg, (void*)wanted_pc);
 384     if (last_func_name[0] != '\0')
 385         fprintf(stderr, " %s()", last_func_name);
 386     if (--i >= 0) {
 387         fprintf(stderr, " (included from ");
 388         for (;;) {
 389             fprintf(stderr, "%s", incl_files[i]);
 390             if (--i < 0)
 391                 break;
 392             fprintf(stderr, ", ");
 393         }
 394         fprintf(stderr, ")");
 395     }
 396     fprintf(stderr, "\n");
 397     fflush(stderr);
 398     return func_addr;
 399 }
 400
 401 /* emit a run time error at position 'pc' */
 402 static void rt_error(ucontext_t *uc, const char *fmt, ...)
 403 {
 404     va_list ap;
 405     addr_t pc;
 406     int i;
 407
 408     fprintf(stderr, "Runtime error: ");
 409     va_start(ap, fmt);
 410     vfprintf(stderr, fmt, ap);
 411     va_end(ap);
 412     fprintf(stderr, "\n");
 413
 414     for(i=0;i<rt_num_callers;i++) {
 415         if (rt_get_caller_pc(&pc, uc, i) < 0)
 416             break;
 417         pc = rt_printline(pc, i ? "by" : "at");
 418         if (pc == (addr_t)rt_prog_main && pc)
 419             break;
 420     }
 421 }
 422
 423 /* ------------------------------------------------------------- */
 424 #ifndef _WIN32
 425
 426 /* signal handler for fatal errors */
 427 static void sig_error(int signum, siginfo_t *siginf, void *puc)
 428 {
 429     ucontext_t *uc = puc;
 430
 431     switch(signum) {
 432     case SIGFPE:
 433         switch(siginf->si_code) {
 434         case FPE_INTDIV:
 435         case FPE_FLTDIV:
 436             rt_error(uc, "division by zero");
 437             break;
 438         default:
 439             rt_error(uc, "floating point exception");
 440             break;
 441         }
 442         break;
 443     case SIGBUS:
 444     case SIGSEGV:
 445         if (rt_bound_error_msg && *rt_bound_error_msg)
 446             rt_error(uc, *rt_bound_error_msg);
 447         else
 448             rt_error(uc, "dereferencing invalid pointer");
 449         break;
 450     case SIGILL:
 451         rt_error(uc, "illegal instruction");
 452         break;
 453     case SIGABRT:
 454         rt_error(uc, "abort() called");
 455         break;
 456     default:
 457         rt_error(uc, "caught signal %d", signum);
 458         break;
 459     }
 460     exit(255);
 461 }
 462
 463 #ifndef SA_SIGINFO
 464 # define SA_SIGINFO 0x00000004u
 465 #endif
 466
 467 /* Generate a stack backtrace when a CPU exception occurs. */
 468 static void set_exception_handler(void)
 469 {
 470     struct sigaction sigact;
 471     /* install TCC signal handlers to print debug info on fatal
 472        runtime errors */
 473     sigact.sa_flags = SA_SIGINFO | SA_RESETHAND;
 474     sigact.sa_sigaction = sig_error;
 475     sigemptyset(&sigact.sa_mask);
 476     sigaction(SIGFPE, &sigact, NULL);
 477     sigaction(SIGILL, &sigact, NULL);
 478     sigaction(SIGSEGV, &sigact, NULL);
 479     sigaction(SIGBUS, &sigact, NULL);
 480     sigaction(SIGABRT, &sigact, NULL);
 481 }
 482
 483 /* ------------------------------------------------------------- */
 484 #ifdef __i386__
 485
 486 /* fix for glibc 2.1 */
 487 #ifndef REG_EIP
 488 #define REG_EIP EIP
 489 #define REG_EBP EBP
 490 #endif
 491
 492 /* return the PC at frame level 'level'. Return negative if not found */
 493 static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
 494 {
 495     addr_t fp;
 496     int i;
 497
 498     if (level == 0) {
 499 #if defined(__APPLE__)
 500         *paddr = uc->uc_mcontext->__ss.__eip;
 501 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 502         *paddr = uc->uc_mcontext.mc_eip;
 503 #elif defined(__dietlibc__)
 504         *paddr = uc->uc_mcontext.eip;
 505 #else
 506         *paddr = uc->uc_mcontext.gregs[REG_EIP];
 507 #endif
 508         return 0;
 509     } else {
 510 #if defined(__APPLE__)
 511         fp = uc->uc_mcontext->__ss.__ebp;
 512 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 513         fp = uc->uc_mcontext.mc_ebp;
 514 #elif defined(__dietlibc__)
 515         fp = uc->uc_mcontext.ebp;
 516 #else
 517         fp = uc->uc_mcontext.gregs[REG_EBP];
 518 #endif
 519         for(i=1;i<level;i++) {
 520             /* XXX: check address validity with program info */
 521             if (fp <= 0x1000 || fp >= 0xc0000000)
 522                 return -1;
 523             fp = ((addr_t *)fp)[0];
 524         }
 525         *paddr = ((addr_t *)fp)[1];
 526         return 0;
 527     }
 528 }
 529
 530 /* ------------------------------------------------------------- */
 531 #elif defined(__x86_64__)
 532
 533 /* return the PC at frame level 'level'. Return negative if not found */
 534 static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
 535 {
 536     addr_t fp;
 537     int i;
 538
 539     if (level == 0) {
 540         /* XXX: only support linux */
 541 #if defined(__APPLE__)
 542         *paddr = uc->uc_mcontext->__ss.__rip;
 543 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 544         *paddr = uc->uc_mcontext.mc_rip;
 545 #else
 546         *paddr = uc->uc_mcontext.gregs[REG_RIP];
 547 #endif
 548         return 0;
 549     } else {
 550 #if defined(__APPLE__)
 551         fp = uc->uc_mcontext->__ss.__rbp;
 552 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 553         fp = uc->uc_mcontext.mc_rbp;
 554 #else
 555         fp = uc->uc_mcontext.gregs[REG_RBP];
 556 #endif
 557         for(i=1;i<level;i++) {
 558             /* XXX: check address validity with program info */
 559             if (fp <= 0x1000)
 560                 return -1;
 561             fp = ((addr_t *)fp)[0];
 562         }
 563         *paddr = ((addr_t *)fp)[1];
 564         return 0;
 565     }
 566 }
 567
 568 /* ------------------------------------------------------------- */
 569 #elif defined(__arm__)
 570
 571 /* return the PC at frame level 'level'. Return negative if not found */
 572 static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
 573 {
 574     addr_t fp, sp;
 575     int i;
 576
 577     if (level == 0) {
 578         /* XXX: only supports linux */
 579 #if defined(__linux__)
 580         *paddr = uc->uc_mcontext.arm_pc;
 581 #else
 582         return -1;
 583 #endif
 584         return 0;
 585     } else {
 586 #if defined(__linux__)
 587         fp = uc->uc_mcontext.arm_fp;
 588         sp = uc->uc_mcontext.arm_sp;
 589         if (sp < 0x1000)
 590             sp = 0x1000;
 591 #else
 592         return -1;
 593 #endif
 594         /* XXX: specific to tinycc stack frames */
 595         if (fp < sp + 12 || fp & 3)
 596             return -1;
 597         for(i = 1; i < level; i++) {
 598             sp = ((addr_t *)fp)[-2];
 599             if (sp < fp || sp - fp > 16 || sp & 3)
 600                 return -1;
 601             fp = ((addr_t *)fp)[-3];
 602             if (fp <= sp || fp - sp < 12 || fp & 3)
 603                 return -1;
 604         }
 605         /* XXX: check address validity with program info */
 606         *paddr = ((addr_t *)fp)[-1];
 607         return 0;
 608     }
 609 }
 610
 611 /* ------------------------------------------------------------- */
 612 #else
 613
 614 #warning add arch specific rt_get_caller_pc()
 615 static int rt_get_caller_pc(addr_t *paddr, ucontext_t *uc, int level)
 616 {
 617     return -1;
 618 }
 619
 620 #endif /* !__i386__ */
 621
 622 /* ------------------------------------------------------------- */
 623 #else /* WIN32 */
 624
 625 static long __stdcall cpu_exception_handler(EXCEPTION_POINTERS *ex_info)
 626 {
 627     EXCEPTION_RECORD *er = ex_info->ExceptionRecord;
 628     CONTEXT *uc = ex_info->ContextRecord;
 629     switch (er->ExceptionCode) {
 630     case EXCEPTION_ACCESS_VIOLATION:
 631         if (rt_bound_error_msg && *rt_bound_error_msg)
 632             rt_error(uc, *rt_bound_error_msg);
 633         else
 634             rt_error(uc, "access violation");
 635         break;
 636     case EXCEPTION_STACK_OVERFLOW:
 637         rt_error(uc, "stack overflow");
 638         break;
 639     case EXCEPTION_INT_DIVIDE_BY_ZERO:
 640         rt_error(uc, "division by zero");
 641         break;
 642     default:
 643         rt_error(uc, "exception caught");
 644         break;
 645     }
 646     return EXCEPTION_EXECUTE_HANDLER;
 647 }
 648
 649 /* Generate a stack backtrace when a CPU exception occurs. */
 650 static void set_exception_handler(void)
 651 {
 652     SetUnhandledExceptionFilter(cpu_exception_handler);
 653 }
 654
 655 #ifdef _WIN64
 656 static void win64_add_function_table(TCCState *s1)
 657 {
 658     RtlAddFunctionTable(
 659         (RUNTIME_FUNCTION*)s1->uw_pdata->sh_addr,
 660         s1->uw_pdata->data_offset / sizeof (RUNTIME_FUNCTION),
 661         text_section->sh_addr
 662         );
 663 }
 664 #endif
 665
 666 /* return the PC at frame level 'level'. Return non zero if not found */
 667 static int rt_get_caller_pc(addr_t *paddr, CONTEXT *uc, int level)
 668 {
 669     addr_t fp, pc;
 670     int i;
 671 #ifdef _WIN64
 672     pc = uc->Rip;
 673     fp = uc->Rbp;
 674 #else
 675     pc = uc->Eip;
 676     fp = uc->Ebp;
 677 #endif
 678     if (level > 0) {
 679         for(i=1;i<level;i++) {
 680             /* XXX: check address validity with program info */
 681             if (fp <= 0x1000 || fp >= 0xc0000000)
 682                 return -1;
 683             fp = ((addr_t*)fp)[0];
 684         }
 685         pc = ((addr_t*)fp)[1];
 686     }
 687     *paddr = pc;
 688     return 0;
 689 }
 690
 691 #endif /* _WIN32 */
 692 #endif /* CONFIG_TCC_BACKTRACE */
 693 /* ------------------------------------------------------------- */
 694 #ifdef CONFIG_TCC_STATIC
 695
 696 /* dummy function for profiling */
 697 ST_FUNC void *dlopen(const char *filename, int flag)
 698 {
 699     return NULL;
 700 }
 701
 702 ST_FUNC void dlclose(void *p)
 703 {
 704 }
 705
 706 ST_FUNC const char *dlerror(void)
 707 {
 708     return "error";
 709 }
 710
 711 typedef struct TCCSyms {
 712     char *str;
 713     void *ptr;
 714 } TCCSyms;
 715
 716
 717 /* add the symbol you want here if no dynamic linking is done */
 718 static TCCSyms tcc_syms[] = {
 719 #if !defined(CONFIG_TCCBOOT)
 720 #define TCCSYM(a) { #a, &a, },
 721     TCCSYM(printf)
 722     TCCSYM(fprintf)
 723     TCCSYM(fopen)
 724     TCCSYM(fclose)
 725 #undef TCCSYM
 726 #endif
 727     { NULL, NULL },
 728 };
 729
 730 ST_FUNC void *resolve_sym(TCCState *s1, const char *symbol)
 731 {
 732     TCCSyms *p;
 733     p = tcc_syms;
 734     while (p->str != NULL) {
 735         if (!strcmp(p->str, symbol))
 736             return p->ptr;
 737         p++;
 738     }
 739     return NULL;
 740 }
 741
 742 #elif !defined(_WIN32)
 743
 744 ST_FUNC void *resolve_sym(TCCState *s1, const char *sym)
 745 {
 746     return dlsym(RTLD_DEFAULT, sym);
 747 }
 748
 749 #endif /* CONFIG_TCC_STATIC */
 750 #endif /* TCC_IS_NATIVE */
 751 /* ------------------------------------------------------------- */