coregrind/m_libcassert.c

   1
   2 /*--------------------------------------------------------------------*/
   3 /*--- Assertions and panics.                        m_libcassert.c ---*/
   4 /*--------------------------------------------------------------------*/
   5
   6 /*
   7    This file is part of Valgrind, a dynamic binary instrumentation
   8    framework.
   9
  10    Copyright (C) 2000-2017 Julian Seward
  11       jseward@acm.org
  12
  13    This program is free software; you can redistribute it and/or
  14    modify it under the terms of the GNU General Public License as
  15    published by the Free Software Foundation; either version 2 of the
  16    License, or (at your option) any later version.
  17
  18    This program is distributed in the hope that it will be useful, but
  19    WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21    General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program; if not, see <http://www.gnu.org/licenses/>.
  25
  26    The GNU General Public License is contained in the file COPYING.
  27 */
  28
  29 #include "pub_core_basics.h"
  30 #include "pub_core_vki.h"
  31 #include "pub_core_vkiscnums.h"
  32 #include "pub_core_threadstate.h"
  33 #include "pub_core_gdbserver.h"
  34 #include "pub_core_aspacemgr.h"
  35 #include "pub_core_libcbase.h"
  36 #include "pub_core_libcassert.h"
  37 #include "pub_core_libcprint.h"
  38 #include "pub_core_libcproc.h"      // For VG_(gettid)()
  39 #include "pub_core_machine.h"
  40 #include "pub_core_stacks.h"
  41 #include "pub_core_stacktrace.h"
  42 #include "pub_core_syscall.h"
  43 #include "pub_core_syswrap.h"
  44 #include "pub_core_tooliface.h"     // For VG_(details).{name,bug_reports_to}
  45 #include "pub_core_options.h"       // For VG_(clo_xml)
  46
  47 /* ---------------------------------------------------------------------
  48    Assertery.
  49    ------------------------------------------------------------------ */
  50
  51 #if defined(VGP_x86_linux) || defined(VGP_x86_darwin) \
  52     || defined(VGP_x86_solaris) || defined(VGP_x86_freebsd)
  53 #  define GET_STARTREGS(srP)                              \
  54       { UInt eip, esp, ebp;                               \
  55         __asm__ __volatile__(                             \
  56            "call 0f;"                                     \
  57            "0: popl %0;"                                  \
  58            "movl %%esp, %1;"                              \
  59            "movl %%ebp, %2;"                              \
  60            : "=r" (eip), "=r" (esp), "=r" (ebp)           \
  61            : /* reads none */                             \
  62            : "memory"                                     \
  63         );                                                \
  64         (srP)->r_pc = (ULong)eip;                         \
  65         (srP)->r_sp = (ULong)esp;                         \
  66         (srP)->misc.X86.r_ebp = ebp;                      \
  67       }
  68 #elif defined(VGP_amd64_linux) || defined(VGP_amd64_darwin) \
  69       || defined(VGP_amd64_solaris) || defined(VGP_amd64_freebsd)
  70 #  define GET_STARTREGS(srP)                              \
  71       { ULong rip, rsp, rbp;                              \
  72         __asm__ __volatile__(                             \
  73            "leaq 0(%%rip), %0;"                           \
  74            "movq %%rsp, %1;"                              \
  75            "movq %%rbp, %2;"                              \
  76            : "=r" (rip), "=r" (rsp), "=r" (rbp)           \
  77            : /* reads none */                             \
  78            : "memory"                                     \
  79         );                                                \
  80         (srP)->r_pc = rip;                                \
  81         (srP)->r_sp = rsp;                                \
  82         (srP)->misc.AMD64.r_rbp = rbp;                    \
  83       }
  84 #elif defined(VGP_ppc32_linux)
  85 #  define GET_STARTREGS(srP)                              \
  86       { UInt cia, r1, lr;                                 \
  87         __asm__ __volatile__(                             \
  88            "mflr 0;"                   /* r0 = lr */      \
  89            "bl 0f;"                    /* lr = pc */      \
  90            "0:\n"                                         \
  91            "mflr %0;"                  /* %0 = pc */      \
  92            "mtlr 0;"                   /* restore lr */   \
  93            "mr %1,1;"                  /* %1 = r1 */      \
  94            "mr %2,0;"                  /* %2 = lr */      \
  95            : "=r" (cia), "=r" (r1), "=r" (lr)             \
  96            : /* reads none */                             \
  97            : "r0" /* trashed */                           \
  98         );                                                \
  99         (srP)->r_pc = (ULong)cia;                         \
 100         (srP)->r_sp = (ULong)r1;                          \
 101         (srP)->misc.PPC32.r_lr = lr;                      \
 102       }
 103 #elif defined(VGP_ppc64be_linux) || defined(VGP_ppc64le_linux)
 104 #  define GET_STARTREGS(srP)                              \
 105       { ULong cia, r1, lr;                                \
 106         __asm__ __volatile__(                             \
 107            "mflr 0;"                   /* r0 = lr */      \
 108            "bl 0f;"                    /* lr = pc */      \
 109            "0:\n"                                         \
 110            "mflr %0;"                  /* %0 = pc */      \
 111            "mtlr 0;"                   /* restore lr */   \
 112            "mr %1,1;"                  /* %1 = r1 */      \
 113            "mr %2,0;"                  /* %2 = lr */      \
 114            : "=r" (cia), "=r" (r1), "=r" (lr)             \
 115            : /* reads none */                             \
 116            : "r0" /* trashed */                           \
 117         );                                                \
 118         (srP)->r_pc = cia;                                \
 119         (srP)->r_sp = r1;                                 \
 120         (srP)->misc.PPC64.r_lr = lr;                      \
 121       }
 122 #elif defined(VGP_arm_linux)
 123 #  define GET_STARTREGS(srP)                              \
 124       { UInt block[6];                                    \
 125         __asm__ __volatile__(                             \
 126            "str r15, [%0, #+0];"                          \
 127            "str r14, [%0, #+4];"                          \
 128            "str r13, [%0, #+8];"                          \
 129            "str r12, [%0, #+12];"                         \
 130            "str r11, [%0, #+16];"                         \
 131            "str r7,  [%0, #+20];"                         \
 132            : /* out */                                    \
 133            : /* in */ "r"(&block[0])                      \
 134            : /* trash */ "memory"                         \
 135         );                                                \
 136         (srP)->r_pc = block[0] - 8;                       \
 137         (srP)->misc.ARM.r14 = block[1];                   \
 138         (srP)->r_sp = block[2];                           \
 139         (srP)->misc.ARM.r12 = block[3];                   \
 140         (srP)->misc.ARM.r11 = block[4];                   \
 141         (srP)->misc.ARM.r7  = block[5];                   \
 142       }
 143 #elif defined(VGP_arm64_linux)
 144 #  define GET_STARTREGS(srP)                              \
 145       { ULong block[4];                                   \
 146         __asm__ __volatile__(                             \
 147            "adr x19, 0;"                                  \
 148            "str x19, [%0, #+0];"   /* pc */               \
 149            "mov x19, sp;"                                 \
 150            "str x19, [%0, #+8];"   /* sp */               \
 151            "str x29, [%0, #+16];"  /* fp */               \
 152            "str x30, [%0, #+24];"  /* lr */               \
 153            : /* out */                                    \
 154            : /* in */ "r"(&block[0])                      \
 155            : /* trash */ "memory","x19"                   \
 156         );                                                \
 157         (srP)->r_pc = block[0];                           \
 158         (srP)->r_sp = block[1];                           \
 159         (srP)->misc.ARM64.x29 = block[2];                 \
 160         (srP)->misc.ARM64.x30 = block[3];                 \
 161       }
 162 #elif defined(VGP_s390x_linux)
 163 #  define GET_STARTREGS(srP)                              \
 164       { ULong ia;                                         \
 165         ULong block[11];                                  \
 166         __asm__ __volatile__(                             \
 167            "bras %0, 0f;"                                 \
 168            "0: "                                          \
 169            "stg %%r15, 0(%1);"                            \
 170            "stg %%r11, 8(%1);"                            \
 171            "stg %%r14, 16(%1);"                           \
 172            "std %%f0, 24(%1);"                            \
 173            "std %%f1, 32(%1);"                            \
 174            "std %%f2, 40(%1);"                            \
 175            "std %%f3, 48(%1);"                            \
 176            "std %%f4, 56(%1);"                            \
 177            "std %%f5, 64(%1);"                            \
 178            "std %%f6, 72(%1);"                            \
 179            "std %%f7, 80(%1);"                            \
 180            : /* out */   "=r" (ia)                        \
 181            : /* in */    "a" (&block[0])                  \
 182            : /* trash */ "memory"                         \
 183         );                                                \
 184         (srP)->r_pc = ia;                                 \
 185         (srP)->r_sp = block[0];                           \
 186         (srP)->misc.S390X.r_fp = block[1];                \
 187         (srP)->misc.S390X.r_lr = block[2];                \
 188         (srP)->misc.S390X.r_f0 = block[3];                \
 189         (srP)->misc.S390X.r_f1 = block[4];                \
 190         (srP)->misc.S390X.r_f2 = block[5];                \
 191         (srP)->misc.S390X.r_f3 = block[6];                \
 192         (srP)->misc.S390X.r_f4 = block[7];                \
 193         (srP)->misc.S390X.r_f5 = block[8];                \
 194         (srP)->misc.S390X.r_f6 = block[9];                \
 195         (srP)->misc.S390X.r_f7 = block[10];               \
 196       }
 197 #elif defined(VGP_mips32_linux)
 198 #  define GET_STARTREGS(srP)                              \
 199       { UInt pc, sp, fp, ra, gp;                          \
 200       asm("move $8, $31;"             /* t0 = ra */       \
 201           "bal 0f;"                   /* ra = pc */       \
 202           "0:\n"                                          \
 203           "move %0, $31;"                                 \
 204           "move $31, $8;"             /* restore lr */    \
 205           "move %1, $29;"                                 \
 206           "move %2, $30;"                                 \
 207           "move %3, $31;"                                 \
 208           "move %4, $28;"                                 \
 209           : "=r" (pc),                                    \
 210             "=r" (sp),                                    \
 211             "=r" (fp),                                    \
 212             "=r" (ra),                                    \
 213             "=r" (gp)                                     \
 214           : /* reads none */                              \
 215           : "$8" /* trashed */ );                         \
 216         (srP)->r_pc = (ULong)pc - 8;                      \
 217         (srP)->r_sp = (ULong)sp;                          \
 218         (srP)->misc.MIPS32.r30 = (ULong)fp;               \
 219         (srP)->misc.MIPS32.r31 = (ULong)ra;               \
 220         (srP)->misc.MIPS32.r28 = (ULong)gp;               \
 221       }
 222 #elif defined(VGP_mips64_linux)
 223 #  define GET_STARTREGS(srP)                              \
 224       { ULong pc, sp, fp, ra, gp;                         \
 225       asm("move $8, $31;"             /* t0 = ra */       \
 226           "bal 0f;"                   /* ra = pc */       \
 227           "0:\n"                                          \
 228           "move %0, $31;"                                 \
 229           "move $31, $8;"             /* restore lr */    \
 230           "move %1, $29;"                                 \
 231           "move %2, $30;"                                 \
 232           "move %3, $31;"                                 \
 233           "move %4, $28;"                                 \
 234           : "=r" (pc),                                    \
 235             "=r" (sp),                                    \
 236             "=r" (fp),                                    \
 237             "=r" (ra),                                    \
 238             "=r" (gp)                                     \
 239           : /* reads none */                              \
 240           : "$8" /* trashed */ );                         \
 241         (srP)->r_pc = (ULong)pc - 8;                      \
 242         (srP)->r_sp = (ULong)sp;                          \
 243         (srP)->misc.MIPS64.r30 = (ULong)fp;               \
 244         (srP)->misc.MIPS64.r31 = (ULong)ra;               \
 245         (srP)->misc.MIPS64.r28 = (ULong)gp;               \
 246       }
 247 #elif defined(VGP_nanomips_linux)
 248 #  define GET_STARTREGS(srP)                              \
 249       { UInt pc=0, sp=0, fp=0, ra=0, gp=0;                \
 250       asm("addiupc[32] %0, -4          \n\t"              \
 251           "move %1, $sp                \n\t"              \
 252           "move %2, $fp                \n\t"              \
 253           "move %3, $ra                \n\t"              \
 254           "move %4, $gp                \n\t"              \
 255           : "=r" (pc),                                    \
 256             "=r" (sp),                                    \
 257             "=r" (fp),                                    \
 258             "=r" (ra),                                    \
 259             "=r" (gp)                                     \
 260           );                                              \
 261         (srP)->r_pc = (UInt)pc;                           \
 262         (srP)->r_sp = (UInt)sp;                           \
 263         (srP)->misc.MIPS32.r30 = (UInt)fp;                \
 264         (srP)->misc.MIPS32.r31 = (UInt)ra;                \
 265         (srP)->misc.MIPS32.r28 = (UInt)gp;                \
 266       }
 267 #else
 268 #  error Unknown platform
 269 #endif
 270
 271 #define BACKTRACE_DEPTH    100         // nice and deep!
 272
 273 __attribute__ ((__noreturn__))
 274 static void exit_wrk( Int status, Bool gdbserver_call_allowed)
 275 {
 276    static Bool exit_called = False;
 277    // avoid recursive exit during gdbserver call.
 278
 279    if (gdbserver_call_allowed && !exit_called) {
 280       const ThreadId atid = 1; // Arbitrary tid used to call/terminate gdbsrv.
 281       exit_called = True;
 282       if (status != 0
 283           && VgdbStopAtiS(VgdbStopAt_ValgrindAbExit, VG_(clo_vgdb_stop_at))) {
 284          if (VG_(gdbserver_init_done)()) {
 285             VG_(umsg)("(action at valgrind abnormal exit) vgdb me ... \n");
 286             VG_(gdbserver) (atid);
 287          } else {
 288             VG_(umsg)("(action at valgrind abnormal exit)\n"
 289                       "valgrind exit is too early => vgdb not yet usable\n");
 290          }
 291       }
 292       if (VG_(gdbserver_init_done)()) {
 293          // Always terminate the gdbserver when Valgrind exits, so as
 294          // to e.g. cleanup the FIFOs.
 295          VG_(gdbserver_exit) (atid,
 296                               status == 0 ? VgSrc_ExitProcess : VgSrc_FatalSig);
 297       }
 298    }
 299    exit_called = True;
 300
 301    VG_(exit_now) (status);
 302 }
 303
 304 /* Call the appropriate system call and nothing else. This function should
 305    be called in places where the dependencies of VG_(exit) need to be
 306    avoided. */
 307 __attribute__ ((__noreturn__))
 308 void VG_(exit_now)( Int status )
 309 {
 310 #if defined(VGO_linux)
 311    (void)VG_(do_syscall1)(__NR_exit_group, status );
 312 #elif defined(VGO_darwin) || defined(VGO_solaris) || defined(VGO_freebsd)
 313    (void)VG_(do_syscall1)(__NR_exit, status );
 314 #else
 315 #  error Unknown OS
 316 #endif
 317    /*NOTREACHED*/
 318    // We really shouldn't reach here.  Just in case we do, use some very crude
 319    // methods to force abort
 320    __builtin_trap();
 321    *(volatile Int*)0 = 'x';
 322 }
 323
 324 /* Pull down the entire world */
 325 void VG_(exit)( Int status )
 326 {
 327    exit_wrk (status, True);
 328 }
 329
 330 /* Pull down the entire world */
 331 void VG_(client_exit)( Int status )
 332 {
 333    exit_wrk (status, False);
 334 }
 335
 336 static void print_thread_state (Bool stack_usage,
 337                                 const HChar* prefix, ThreadId i)
 338 {
 339    VgStack *stack
 340       = (VgStack*)VG_(threads)[i].os_state.valgrind_stack_base;
 341    HChar syscallno[50];
 342    // must be large enough for VG_SYSNUM_STRING result + 10.
 343
 344    if (VG_(is_in_syscall) (i))
 345       VG_(sprintf)(syscallno, " syscall %s",
 346                    VG_SYSNUM_STRING(VG_(is_in_syscall_no)(i)));
 347    else
 348       syscallno[0] = 0;
 349    VG_(printf)("\n%sThread %u: status = %s%s (lwpid %d)\n", prefix, i,
 350                VG_(name_of_ThreadStatus)(VG_(threads)[i].status),
 351                syscallno,
 352                VG_(threads)[i].os_state.lwpid);
 353    if (VG_(threads)[i].status != VgTs_Empty)
 354       VG_(get_and_pp_StackTrace)( i, BACKTRACE_DEPTH );
 355    if (stack_usage && VG_(threads)[i].client_stack_highest_byte != 0 ) {
 356       Addr start, end;
 357
 358       start = end = 0;
 359       VG_(stack_limits)(VG_(get_SP)(i), &start, &end);
 360       if (start != end)
 361          VG_(printf)("%sclient stack range: [%p %p] client SP: %p\n",
 362                      prefix,
 363                      (void*)start, (void*)end, (void*)VG_(get_SP)(i));
 364       else
 365          VG_(printf)("%sclient stack range: ??????? client SP: %p\n",
 366                      prefix,
 367                      (void*)VG_(get_SP)(i));
 368    }
 369    if (stack_usage && stack != 0) {
 370       Addr stack_low_addr = VG_(am_valgrind_stack_low_addr) (stack);
 371
 372       VG_(printf)
 373          ("%svalgrind stack range: [%p %p] top usage: %lu of %lu\n",
 374           prefix,
 375           (void*)stack_low_addr,
 376           (void*)(stack_low_addr + VG_(clo_valgrind_stacksize) - 1),
 377           VG_(clo_valgrind_stacksize)
 378           - VG_(am_get_VgStack_unused_szB) (stack,
 379                                             VG_(clo_valgrind_stacksize)),
 380           (SizeT) VG_(clo_valgrind_stacksize));
 381    }
 382 }
 383
 384 // Print the scheduler status.
 385 static void show_sched_status_wrk ( Bool host_stacktrace,
 386                                     Bool stack_usage,
 387                                     Bool exited_threads,
 388                                     const UnwindStartRegs* startRegsIN)
 389 {
 390    Int i;
 391    if (host_stacktrace) {
 392       const Bool save_clo_xml = VG_(clo_xml);
 393       Addr stacktop;
 394       Addr ips[BACKTRACE_DEPTH];
 395       Int  n_ips;
 396       ThreadState *tst
 397          = VG_(get_ThreadState)( VG_(lwpid_to_vgtid_dead_ok)(VG_(gettid)()));
 398
 399       // If necessary, fake up an ExeContext which is of our actual real CPU
 400       // state.  Could cause problems if we got the panic/exception within the
 401       // execontext/stack dump/symtab code.  But it's better than nothing.
 402       UnwindStartRegs startRegs;
 403       VG_(memset)(&startRegs, 0, sizeof(startRegs));
 404
 405       if (startRegsIN == NULL) {
 406          GET_STARTREGS(&startRegs);
 407       } else {
 408          startRegs = *startRegsIN;
 409       }
 410
 411       stacktop = tst->os_state.valgrind_stack_init_SP;
 412
 413       n_ips =
 414          VG_(get_StackTrace_wrk)(
 415             0/*tid is unknown*/,
 416             ips, BACKTRACE_DEPTH,
 417             NULL/*array to dump SP values in*/,
 418             NULL/*array to dump FP values in*/,
 419             &startRegs, stacktop
 420          );
 421       VG_(printf)("\nhost stacktrace:\n");
 422       VG_(clo_xml) = False;
 423       VG_(pp_StackTrace) (VG_(current_DiEpoch)(), ips, n_ips);
 424       VG_(clo_xml) = save_clo_xml;
 425    }
 426
 427    VG_(printf)("\nsched status:\n");
 428    if (VG_(threads) == NULL) {
 429       VG_(printf)("  scheduler not yet initialised\n");
 430    } else {
 431       VG_(printf)("  running_tid=%u\n", VG_(get_running_tid)());
 432       for (i = 1; i < VG_N_THREADS; i++) {
 433          VgStack *stack
 434             = (VgStack*)VG_(threads)[i].os_state.valgrind_stack_base;
 435          /* If a thread slot was never used (yet), valgrind_stack_base is 0.
 436             If a thread slot is used by a thread or was used by a thread which
 437             has exited, then valgrind_stack_base points to the stack base. */
 438          if (VG_(threads)[i].status == VgTs_Empty
 439              && (!exited_threads || stack == 0)) continue;
 440          print_thread_state(stack_usage, "", i);
 441          if (VG_(inner_threads) != NULL) {
 442             /* An inner V has informed us (the outer) of its thread array.
 443                Report the inner guest stack trace. */
 444             UInt inner_tid;
 445
 446             for (inner_tid = 1; inner_tid < VG_N_THREADS; inner_tid++) {
 447                if (VG_(threads)[i].os_state.lwpid
 448                    == VG_(inner_threads)[inner_tid].os_state.lwpid) {
 449                   ThreadState* save_outer_vg_threads = VG_(threads);
 450
 451                   VG_(threads) = VG_(inner_threads);
 452                   print_thread_state(stack_usage, "INNER ", inner_tid);
 453                   VG_(threads) = save_outer_vg_threads;
 454                   break;
 455                }
 456             }
 457          }
 458       }
 459    }
 460    VG_(printf)("\n");
 461 }
 462
 463 void VG_(show_sched_status) ( Bool host_stacktrace,
 464                               Bool stack_usage,
 465                               Bool exited_threads)
 466 {
 467    show_sched_status_wrk (host_stacktrace,
 468                           stack_usage,
 469                           exited_threads,
 470                           NULL);
 471 }
 472
 473 __attribute__ ((noreturn))
 474 static void report_and_quit ( const HChar* report,
 475                               const UnwindStartRegs* startRegsIN )
 476 {
 477    show_sched_status_wrk (True,  // host_stacktrace
 478                           True,  // stack_usage
 479                           False, // exited_threads
 480                           startRegsIN);
 481    VG_(printf)(
 482       "\n"
 483       "Note: see also the FAQ in the source distribution.\n"
 484       "It contains workarounds to several common problems.\n"
 485       "In particular, if Valgrind aborted or crashed after\n"
 486       "identifying problems in your program, there's a good chance\n"
 487       "that fixing those problems will prevent Valgrind aborting or\n"
 488       "crashing, especially if it happened in m_mallocfree.c.\n"
 489       "\n"
 490       "If that doesn't help, please report this bug to: %s\n\n"
 491       "In the bug report, send all the above text, the valgrind\n"
 492       "version, and what OS and version you are using.  Thanks.\n\n",
 493       report);
 494    VG_(exit)(1);
 495 }
 496
 497 void VG_(assert_fail) ( Bool isCore, const HChar* expr, const HChar* file,
 498                         Int line, const HChar* fn, const HChar* format, ... )
 499 {
 500    va_list vargs, vargs_copy;
 501    const HChar* component;
 502    const HChar* bugs_to;
 503    UInt written;
 504
 505    static Bool entered = False;
 506    if (entered)
 507       VG_(exit)(2);
 508    entered = True;
 509
 510    if (isCore) {
 511       component = "valgrind";
 512       bugs_to   = VG_BUGS_TO;
 513    } else {
 514       component = VG_(details).name;
 515       bugs_to   = VG_(details).bug_reports_to;
 516    }
 517
 518    if (VG_(clo_xml))
 519       VG_(printf_xml)("</valgrindoutput>\n");
 520
 521    // Treat vg_assert2(0, "foo") specially, as a panicky abort
 522    if (VG_STREQ(expr, "0")) {
 523       VG_(printf)("\n%s: %s:%d (%s): the 'impossible' happened.\n",
 524                   component, file, line, fn );
 525    } else {
 526       VG_(printf)("\n%s: %s:%d (%s): Assertion '%s' failed.\n",
 527                   component, file, line, fn, expr );
 528    }
 529
 530    /* Check whether anything will be written */
 531    HChar buf[5];
 532    va_start(vargs, format);
 533    va_copy(vargs_copy, vargs);
 534    written = VG_(vsnprintf) ( buf, sizeof(buf), format, vargs );
 535    va_end(vargs);
 536
 537    if (written > 0) {
 538       VG_(printf)("%s: ", component);
 539       VG_(vprintf)(format, vargs_copy);
 540       VG_(printf)("\n");
 541    }
 542
 543    report_and_quit(bugs_to, NULL);
 544 }
 545
 546 __attribute__ ((noreturn))
 547 static void panic ( const HChar* name, const HChar* report, const HChar* str,
 548                     const UnwindStartRegs* startRegs )
 549 {
 550    if (VG_(clo_xml))
 551       VG_(printf_xml)("</valgrindoutput>\n");
 552    VG_(printf)("\n%s: the 'impossible' happened:\n   %s\n", name, str);
 553    report_and_quit(report, startRegs);
 554 }
 555
 556 void VG_(core_panic_at) ( const HChar* str, const UnwindStartRegs* startRegs )
 557 {
 558    panic("valgrind", VG_BUGS_TO, str, startRegs);
 559 }
 560
 561 void VG_(core_panic) ( const HChar* str )
 562 {
 563    VG_(core_panic_at)(str, NULL);
 564 }
 565
 566 void VG_(tool_panic) ( const HChar* str )
 567 {
 568    panic(VG_(details).name, VG_(details).bug_reports_to, str, NULL);
 569 }
 570
 571 /* Print some helpful-ish text about unimplemented things, and give up. */
 572 void VG_(unimplemented) ( const HChar* format, ... )
 573 {
 574    va_list vargs;
 575    HChar msg[256];
 576
 577    va_start(vargs, format);
 578    VG_(vsnprintf)(msg, sizeof(msg), format, vargs);
 579    va_end(vargs);
 580
 581    if (VG_(clo_xml))
 582       VG_(printf_xml)("</valgrindoutput>\n");
 583    VG_(umsg)("\n");
 584    VG_(umsg)("Valgrind detected that your program requires\n");
 585    VG_(umsg)("the following unimplemented functionality:\n");
 586    VG_(umsg)("   %s\n", msg);
 587    VG_(umsg)("This may be because the functionality is hard to implement,\n");
 588    VG_(umsg)("or because no reasonable program would behave this way,\n");
 589    VG_(umsg)("or because nobody has yet needed it.  "
 590              "In any case, let us know at\n");
 591    VG_(umsg)("%s and/or try to work around the problem, if you can.\n",
 592              VG_BUGS_TO);
 593    VG_(umsg)("\n");
 594    VG_(umsg)("Valgrind has to exit now.  Sorry.  Bye!\n");
 595    VG_(umsg)("\n");
 596    VG_(show_sched_status)(False,  // host_stacktrace
 597                           False,  // stack_usage
 598                           False); // exited_threads
 599    VG_(exit)(1);
 600 }
 601
 602 /*--------------------------------------------------------------------*/
 603 /*--- end                                                          ---*/
 604 /*--------------------------------------------------------------------*/