coregrind/vg_include.h

/*--------------------------------------------------------------------*/
/*--- A header file for all private parts of Valgrind's core.      ---*/
/*--- Include no other!                                            ---*/
/*---                                                 vg_include.h ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of Valgrind, an extensible x86 protected-mode
   emulator for monitoring program execution on x86-Unixes.

   Copyright (C) 2000-2002 Julian Seward 
      jseward@acm.org

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307, USA.

   The GNU General Public License is contained in the file COPYING.
*/

#ifndef __VG_INCLUDE_H
#define __VG_INCLUDE_H

/* ---------------------------------------------------------------------
   Where to send bug reports to.
   ------------------------------------------------------------------ */

#define VG_EMAIL_ADDR "jseward@acm.org"


/* ---------------------------------------------------------------------
   Build options and table sizes.  You should be able to change these
   options or sizes, recompile, and still have a working system.
   ------------------------------------------------------------------ */

#include "vg_constants.h"

/* All stuff visible to core and skins goes in vg_skin.h.  Things
 * visible to core but not visible to any skins should go in this
 * file, vg_include.h. */
#include "vg_skin.h"

/* Total number of spill slots available for allocation, if a TempReg
   doesn't make it into a RealReg.  Just bomb the entire system if
   this value is too small; we don't expect it will ever get
   particularly high. */
#define VG_MAX_SPILLSLOTS 24


/* Constants for the slow translation lookup cache. */
#define VG_TRANSTAB_SLOW_BITS 11
#define VG_TRANSTAB_SLOW_SIZE (1 << VG_TRANSTAB_SLOW_BITS)
#define VG_TRANSTAB_SLOW_MASK ((VG_TRANSTAB_SLOW_SIZE) - 1)

/* Size of a buffer used for creating messages. */
#define M_VG_MSGBUF 10000

/* Size of a smallish table used to read /proc/self/map entries. */
#define M_PROCMAP_BUF 50000

/* Max length of pathname to a .so/executable file. */
#define M_VG_LIBNAMESTR 100

/* Max length of a text fragment used to construct error messages. */
#define M_VG_ERRTXT 512

/* Max length of the string copied from env var VG_ARGS at startup. */
#define M_VG_CMDLINE_STRLEN 1000

/* Max number of options for Valgrind which we can handle. */
#define M_VG_CMDLINE_OPTS 100

/* After this many different unsuppressed errors have been observed,
   be more conservative about collecting new ones. */
#define M_VG_COLLECT_ERRORS_SLOWLY_AFTER 50

/* After this many different unsuppressed errors have been observed,
   stop collecting errors at all, and tell the user their program is
   evidently a steaming pile of camel dung. */
#define M_VG_COLLECT_NO_ERRORS_AFTER_SHOWN 300

/* After this many total errors have been observed, stop collecting
   errors at all.  Counterpart to M_VG_COLLECT_NO_ERRORS_AFTER_SHOWN. */
#define M_VG_COLLECT_NO_ERRORS_AFTER_FOUND 30000

/* The maximum number of calls we're prepared to save in a
   backtrace. */
#define VG_DEEPEST_BACKTRACE 50

/* Number of lists in which we keep track of malloc'd but not free'd
   blocks.  Should be prime. */
#define VG_N_MALLOCLISTS 997

/* Number of lists in which we keep track of ExeContexts.  Should be
   prime. */
#define VG_N_EC_LISTS /*997*/ 4999

/* Defines the thread-scheduling timeslice, in terms of the number of
   basic blocks we attempt to run each thread for.  Smaller values
   give finer interleaving but much increased scheduling overheads. */
#define VG_SCHEDULING_QUANTUM   50000

/* Number of file descriptors that can simultaneously be waited on for
   I/O to complete.  Perhaps this should be the same as VG_N_THREADS
   (surely a thread can't wait on more than one fd at once?.  Who
   knows.) */
#define VG_N_WAITING_FDS 10

/* Stack size for a thread.  We try and check that they do not go
   beyond it. */
#define VG_PTHREAD_STACK_SIZE (1 << 20)

/* Number of entries in the semaphore-remapping table. */
#define VG_N_SEMAPHORES 50

/* Number of entries in the rwlock-remapping table. */
#define VG_N_RWLOCKS 500

/* Number of entries in each thread's cleanup stack. */
#define VG_N_CLEANUPSTACK 8

/* Number of entries in each thread's fork-handler stack. */
#define VG_N_FORKHANDLERSTACK 2

/* Max number of callers for context in a suppression. */
#define VG_N_SUPP_CALLERS  4
   

/* ---------------------------------------------------------------------
   Basic types
   ------------------------------------------------------------------ */

/* Just pray that gcc's constant folding works properly ... */
#define BITS(bit7,bit6,bit5,bit4,bit3,bit2,bit1,bit0)               \
   ( ((bit7) << 7) | ((bit6) << 6) | ((bit5) << 5) | ((bit4) << 4)  \
     | ((bit3) << 3) | ((bit2) << 2) | ((bit1) << 1) | (bit0))

/* ---------------------------------------------------------------------
   Command-line-settable options
   ------------------------------------------------------------------ */

#define VG_CLO_MAX_SFILES 10

/* Describes where logging output is to be sent. */
typedef
   enum {
      VgLogTo_Fd,
      VgLogTo_File,
      VgLogTo_Socket
   } VgLogTo;


/* Should we stop collecting errors if too many appear?  default: YES */
extern Bool  VG_(clo_error_limit);
/* Enquire about whether to attach to GDB at errors?   default: NO */
extern Bool  VG_(clo_GDB_attach);
/* Sanity-check level: 0 = none, 1 (default), > 1 = expensive. */
extern Int   VG_(sanity_level);
/* Automatically attempt to demangle C++ names?  default: YES */
extern Bool  VG_(clo_demangle);
/* Round malloc sizes upwards to integral number of words? default:
   NO */
extern Bool  VG_(clo_sloppy_malloc);
/* Minimum alignment in functions that don't specify alignment explicitly.
   default: 0, i.e. use default of the machine (== 4) */
extern Int   VG_(clo_alignment);
/* Simulate child processes? default: NO */
extern Bool  VG_(clo_trace_children);

/* Where logging output is to be sent to.

   When log_to == VgLogTo_Fd, clo_logfile_fd holds the file id, and is
   taken from the command line.  clo_logfile_name is irrelevant.

   When log_to == VgLogTo_File, clo_logfile_name holds the logfile
   name, and is taken from the command line.  clo_logfile_fd is then
   made to hold the relevant file id, by opening clo_logfile_name
   (concatenated with the process ID) for writing.

   When log_to == VgLogTo_Socket, clo_logfile_name holds the
   hostname:portnumber pair, and is taken from the command line.
   clo_logfile_fd is then made to hold the relevant file handle, by
   opening a connection to said hostname:portnumber pair. 

   Global default is to set log_to == VgLogTo_Fd and logfile_fd == 2
   (stderr). */
extern VgLogTo VG_(clo_log_to);
extern Int     VG_(clo_logfile_fd);
extern Char*   VG_(clo_logfile_name);

/* The number of suppression files specified. */
extern Int   VG_(clo_n_suppressions);
/* The names of the suppression files. */
extern Char* VG_(clo_suppressions)[VG_CLO_MAX_SFILES];

/* Single stepping?  default: NO */
extern Bool  VG_(clo_single_step);
/* Code improvement?  default: YES */
extern Bool  VG_(clo_optimise);
/* DEBUG: print generated code?  default: 00000 ( == NO ) */
extern Bool  VG_(clo_trace_codegen);
/* DEBUG: print system calls?  default: NO */
extern Bool  VG_(clo_trace_syscalls);
/* DEBUG: print signal details?  default: NO */
extern Bool  VG_(clo_trace_signals);
/* DEBUG: print symtab details?  default: NO */
extern Bool  VG_(clo_trace_symtab);
/* DEBUG: print malloc details?  default: NO */
extern Bool  VG_(clo_trace_malloc);
/* DEBUG: print thread scheduling events?  default: NO */
extern Bool  VG_(clo_trace_sched);
/* DEBUG: print pthread (mutex etc) events?  default: 0 (none), 1
   (some), 2 (all) */
extern Int   VG_(clo_trace_pthread_level);
/* Stop after this many basic blocks.  default: Infinity. */
extern ULong VG_(clo_stop_after);
/* Display gory details for the k'th most popular error.  default:
   Infinity. */
extern Int   VG_(clo_dump_error);
/* Number of parents of a backtrace.  Default: 8.  */
extern Int   VG_(clo_backtrace_size);
/* Engage miscellaneous wierd hacks needed for some progs. */
extern Char* VG_(clo_weird_hacks);
/* Should we run __libc_freeres at exit?  Sometimes causes crashes.
   Default: YES.  Note this is subservient to VG_(needs).libc_freeres;
   if the latter says False, then the setting of VG_(clo_weird_hacks)
   is ignored.  Ie if a skin says no, I don't want this to run, that
   cannot be overridden from the command line. */
extern Bool  VG_(clo_run_libc_freeres);


/* ---------------------------------------------------------------------
   Debugging and profiling stuff
   ------------------------------------------------------------------ */

/* Change to 1 to get more accurate but more expensive core profiling. */
#if 0
#  define VGP_ACCURATE_PROFILING
#endif

/* Create a logfile into which messages can be dumped. */
extern void VG_(startup_logging) ( void );
extern void VG_(shutdown_logging)( void );

extern void VGP_(init_profiling) ( void );
extern void VGP_(done_profiling) ( void );

#undef  VGP_PUSHCC
#undef  VGP_POPCC
#define VGP_PUSHCC(x)   if (VG_(clo_profile)) VGP_(pushcc)(x)
#define VGP_POPCC(x)    if (VG_(clo_profile)) VGP_(popcc)(x)

/* Use this for ones that happen a lot and thus we don't want to put in
   all the time, eg. for %esp assignment. */
#ifdef VGP_ACCURATE_PROFILING
#  define VGP_MAYBE_PUSHCC(x)   if (VG_(clo_profile)) VGP_(pushcc)(x)
#  define VGP_MAYBE_POPCC(x)    if (VG_(clo_profile)) VGP_(popcc)(x)
#else
#  define VGP_MAYBE_PUSHCC(x)
#  define VGP_MAYBE_POPCC(x)
#endif


/* ---------------------------------------------------------------------
   Exports of vg_malloc2.c
   ------------------------------------------------------------------ */

/* Allocation arenas.  
      CORE      is for the core's general use.
      SKIN      is for the skin to use (and the only one it uses).
      SYMTAB    is for Valgrind's symbol table storage.
      JITTER    is for small storage during translation.
      CLIENT    is for the client's mallocs/frees.
      DEMANGLE  is for the C++ demangler.
      EXECTXT   is for storing ExeContexts.
      ERRORS    is for storing CoreErrors.
      TRANSIENT is for very short-term use.  It should be empty
                in between uses.
   When adding a new arena, remember also to add it to ensure_mm_init(). 
*/
typedef Int ArenaId;

#define VG_N_ARENAS 9

#define VG_AR_CORE      0    /* :: ArenaId */
#define VG_AR_SKIN      1    /* :: ArenaId */
#define VG_AR_SYMTAB    2    /* :: ArenaId */
#define VG_AR_JITTER    3    /* :: ArenaId */
#define VG_AR_CLIENT    4    /* :: ArenaId */
#define VG_AR_DEMANGLE  5    /* :: ArenaId */
#define VG_AR_EXECTXT   6    /* :: ArenaId */
#define VG_AR_ERRORS    7    /* :: ArenaId */
#define VG_AR_TRANSIENT 8    /* :: ArenaId */

extern void* VG_(arena_malloc)  ( ArenaId arena, Int nbytes );
extern void  VG_(arena_free)    ( ArenaId arena, void* ptr );
extern void* VG_(arena_calloc)  ( ArenaId arena, Int nmemb, Int nbytes );
extern void* VG_(arena_realloc) ( ArenaId arena, void* ptr, Int alignment,
                                  Int size );
extern void* VG_(arena_malloc_aligned) ( ArenaId aid, Int req_alignB, 
                                                Int req_pszB );

extern void  VG_(mallocSanityCheckAll)   ( void );

extern void  VG_(show_all_arena_stats) ( void );
extern Bool  VG_(is_empty_arena) ( ArenaId aid );


/* The red-zone size for the client.  This can be arbitrary, but
   unfortunately must be set at compile time. */
#define VG_AR_CLIENT_REDZONE_SZW 4

#define VG_AR_CLIENT_REDZONE_SZB \
   (VG_AR_CLIENT_REDZONE_SZW * VKI_BYTES_PER_WORD)


/* ---------------------------------------------------------------------
   Exports of vg_clientfuncs.c
   ------------------------------------------------------------------ */

/* This doesn't export code or data that valgrind.so needs to link
   against.  However, the scheduler does need to know the following
   request codes.  A few, publically-visible, request codes are also
   defined in valgrind.h, and similar headers for some skins. */

#define VG_USERREQ__MALLOC              0x2001
#define VG_USERREQ__BUILTIN_NEW         0x2002
#define VG_USERREQ__BUILTIN_VEC_NEW     0x2003

#define VG_USERREQ__FREE                0x2004
#define VG_USERREQ__BUILTIN_DELETE      0x2005
#define VG_USERREQ__BUILTIN_VEC_DELETE  0x2006

#define VG_USERREQ__CALLOC              0x2007
#define VG_USERREQ__REALLOC             0x2008
#define VG_USERREQ__MEMALIGN            0x2009


/* (Fn, Arg): Create a new thread and run Fn applied to Arg in it.  Fn
   MUST NOT return -- ever.  Eventually it will do either __QUIT or
   __WAIT_JOINER.  */
#define VG_USERREQ__APPLY_IN_NEW_THREAD     0x3001

/* ( no-args ): calling thread disappears from the system forever.
   Reclaim resources. */
#define VG_USERREQ__QUIT                    0x3002

/* ( void* ): calling thread waits for joiner and returns the void* to
   it. */
#define VG_USERREQ__WAIT_JOINER             0x3003

/* ( ThreadId, void** ): wait to join a thread. */
#define VG_USERREQ__PTHREAD_JOIN            0x3004

/* Set cancellation state and type for this thread. */
#define VG_USERREQ__SET_CANCELSTATE         0x3005
#define VG_USERREQ__SET_CANCELTYPE          0x3006

/* ( no-args ): Test if we are at a cancellation point. */
#define VG_USERREQ__TESTCANCEL              0x3007

/* ( ThreadId, &thread_exit_wrapper is the only allowable arg ): call
   with this arg to indicate that a cancel is now pending for the
   specified thread. */
#define VG_USERREQ__SET_CANCELPEND          0x3008

/* Set/get detach state for this thread. */
#define VG_USERREQ__SET_OR_GET_DETACH       0x3009

#define VG_USERREQ__PTHREAD_GET_THREADID    0x300B
#define VG_USERREQ__PTHREAD_MUTEX_LOCK      0x300C
#define VG_USERREQ__PTHREAD_MUTEX_TRYLOCK   0x300D
#define VG_USERREQ__PTHREAD_MUTEX_UNLOCK    0x300E
#define VG_USERREQ__PTHREAD_COND_WAIT       0x300F
#define VG_USERREQ__PTHREAD_COND_TIMEDWAIT  0x3010
#define VG_USERREQ__PTHREAD_COND_SIGNAL     0x3011
#define VG_USERREQ__PTHREAD_COND_BROADCAST  0x3012
#define VG_USERREQ__PTHREAD_KEY_CREATE      0x3013
#define VG_USERREQ__PTHREAD_KEY_DELETE      0x3014
#define VG_USERREQ__PTHREAD_SETSPECIFIC_PTR 0x3015
#define VG_USERREQ__PTHREAD_GETSPECIFIC_PTR 0x3016
#define VG_USERREQ__READ_MILLISECOND_TIMER  0x3017
#define VG_USERREQ__PTHREAD_SIGMASK         0x3018
#define VG_USERREQ__SIGWAIT                 0x3019
#define VG_USERREQ__PTHREAD_KILL            0x301A
#define VG_USERREQ__PTHREAD_YIELD           0x301B
#define VG_USERREQ__PTHREAD_KEY_VALIDATE    0x301C

#define VG_USERREQ__CLEANUP_PUSH            0x3020
#define VG_USERREQ__CLEANUP_POP             0x3021
#define VG_USERREQ__GET_KEY_D_AND_S         0x3022

#define VG_USERREQ__NUKE_OTHER_THREADS      0x3023

/* Ask how many signal handler returns have happened to this
   thread. */
#define VG_USERREQ__GET_N_SIGS_RETURNED     0x3024

/* Get/set entries for a thread's pthread_atfork stack. */
#define VG_USERREQ__SET_FHSTACK_USED        0x3025
#define VG_USERREQ__GET_FHSTACK_USED        0x3026
#define VG_USERREQ__SET_FHSTACK_ENTRY       0x3027
#define VG_USERREQ__GET_FHSTACK_ENTRY       0x3028

/* Denote the finish of VG_(__libc_freeres_wrapper). */
#define VG_USERREQ__LIBC_FREERES_DONE       0x3029

/* Cosmetic ... */
#define VG_USERREQ__GET_PTHREAD_TRACE_LEVEL 0x3101
/* Log a pthread error from client-space.  Cosmetic. */
#define VG_USERREQ__PTHREAD_ERROR           0x3102

/* 
In vg_constants.h:
#define VG_USERREQ__SIGNAL_RETURNS          0x4001
*/

/* The scheduler does need to know the address of it so it can be
   called at program exit. */
extern void VG_(__libc_freeres_wrapper)( void );


/* ---------------------------------------------------------------------
   Constants pertaining to the simulated CPU state, VG_(baseBlock),
   which need to go here to avoid ugly circularities.
   ------------------------------------------------------------------ */

/* How big is the saved FPU state? */
#define VG_SIZE_OF_FPUSTATE 108
/* ... and in words ... */
#define VG_SIZE_OF_FPUSTATE_W ((VG_SIZE_OF_FPUSTATE+3)/4)


/* ---------------------------------------------------------------------
   Exports of vg_ldt.c
   ------------------------------------------------------------------ */

/* This is the hardware-format for a segment descriptor, ie what the
   x86 actually deals with.  It is 8 bytes long.  It's ugly.  */

typedef struct _LDT_ENTRY {
    union {
       struct {
          UShort      LimitLow;
          UShort      BaseLow;
          unsigned    BaseMid         : 8;
          unsigned    Type            : 5;
          unsigned    Dpl             : 2;
          unsigned    Pres            : 1;
          unsigned    LimitHi         : 4;
          unsigned    Sys             : 1;
          unsigned    Reserved_0      : 1;
          unsigned    Default_Big     : 1;
          unsigned    Granularity     : 1;
          unsigned    BaseHi          : 8;
       } Bits;
       struct {
          UInt word1;
          UInt word2;
       } Words;
    } 
    LdtEnt;
} VgLdtEntry;

/* Maximum number of LDT entries supported (by the x86). */
#define VG_M_LDT_ENTRIES     8192
/* The size of each LDT entry == sizeof(VgLdtEntry) */
#define VG_LDT_ENTRY_SIZE  8

/* Alloc & copy, and dealloc. */
extern VgLdtEntry* 
         VG_(allocate_LDT_for_thread) ( VgLdtEntry* parent_ldt );
extern void       
         VG_(deallocate_LDT_for_thread) ( VgLdtEntry* ldt );

/* Simulate the modify_ldt syscall. */
extern Int VG_(sys_modify_ldt) ( ThreadId tid,
                                 Int func, void* ptr, UInt bytecount );

/* Called from generated code.  Given a segment selector and a virtual
   address, return a linear address, and do limit checks too. */
extern Addr VG_(do_useseg) ( UInt seg_selector, Addr virtual_addr );


/* ---------------------------------------------------------------------
   Exports of vg_scheduler.c
   ------------------------------------------------------------------ */

typedef
   enum { 
      VgTs_Empty,      /* this slot is not in use */
      VgTs_Runnable,   /* waiting to be scheduled */
      VgTs_WaitJoiner, /* waiting for someone to do join on me */
      VgTs_WaitJoinee, /* waiting for the thread I did join on */
      VgTs_WaitFD,     /* waiting for I/O completion on a fd */
      VgTs_WaitMX,     /* waiting on a mutex */
      VgTs_WaitCV,     /* waiting on a condition variable */
      VgTs_WaitSIG,    /* waiting due to sigwait() */
      VgTs_Sleeping    /* sleeping for a while */
   }
   ThreadStatus;

/* An entry in a threads's cleanup stack. */
typedef
   struct {
      void (*fn)(void*);
      void* arg;
   }
   CleanupEntry;

/* An entry in a thread's fork-handler stack. */
typedef
   struct {
      void (*prepare)(void);
      void (*parent)(void);
      void (*child)(void);
   }
   ForkHandlerEntry;


struct _ThreadState {
   /* ThreadId == 0 (and hence vg_threads[0]) is NEVER USED.
      The thread identity is simply the index in vg_threads[].
      ThreadId == 1 is the root thread and has the special property
      that we don't try and allocate or deallocate its stack.  For
      convenience of generating error message, we also put the
      ThreadId in this tid field, but be aware that it should
      ALWAYS == the index in vg_threads[]. */
   ThreadId tid;

   /* Current scheduling status. 

      Complications: whenever this is set to VgTs_WaitMX, you
      should also set .m_edx to whatever the required return value
      is for pthread_mutex_lock / pthread_cond_timedwait for when
      the mutex finally gets unblocked. */
   ThreadStatus status;

   /* When .status == WaitMX, points to the mutex I am waiting for.
      When .status == WaitCV, points to the mutex associated with
      the condition variable indicated by the .associated_cv field.
      In all other cases, should be NULL. */
   void* /*pthread_mutex_t* */ associated_mx;

   /* When .status == WaitCV, points to the condition variable I am
      waiting for.  In all other cases, should be NULL. */
   void* /*pthread_cond_t* */ associated_cv;

   /* If VgTs_Sleeping, this is when we should wake up, measured in
      milliseconds as supplied by VG_(read_millisecond_counter). 

      If VgTs_WaitCV, this indicates the time at which
      pthread_cond_timedwait should wake up.  If == 0xFFFFFFFF,
      this means infinitely far in the future, viz,
      pthread_cond_wait. */
   UInt awaken_at;

   /* If VgTs_WaitJoiner, return value, as generated by joinees. */
   void* joinee_retval;

   /* If VgTs_WaitJoinee, place to copy the return value to, and
      the identity of the thread we're waiting for. */
   void**   joiner_thread_return;
   ThreadId joiner_jee_tid;      

   /* Whether or not detached. */
   Bool detached;

   /* Cancelability state and type. */
   Bool cancel_st; /* False==PTH_CANCEL_DISABLE; True==.._ENABLE */
   Bool cancel_ty; /* False==PTH_CANC_ASYNCH; True==..._DEFERRED */
  
   /* Pointer to fn to call to do cancellation.  Indicates whether
      or not cancellation is pending.  If NULL, not pending.  Else
      should be &thread_exit_wrapper(), indicating that
      cancallation is pending. */
   void (*cancel_pend)(void*);

   /* The cleanup stack. */
   Int          custack_used;
   CleanupEntry custack[VG_N_CLEANUPSTACK];

   /* A pointer to the thread's-specific-data.  This is handled almost
      entirely from vg_libpthread.c.  We just provide hooks to get and
      set this ptr.  This is either NULL, indicating the thread has
      read/written none of its specifics so far, OR points to a
      void*[VG_N_THREAD_KEYS], allocated and deallocated in
      vg_libpthread.c. */
   void** specifics_ptr;

   /* This thread's blocked-signals mask.  Semantics is that for a
      signal to be delivered to this thread, the signal must not be
      blocked by either the process-wide signal mask nor by this
      one.  So, if this thread is prepared to handle any signal that
      the process as a whole is prepared to handle, this mask should
      be made empty -- and that it is its default, starting
      state. */
   vki_ksigset_t sig_mask;

   /* When not VgTs_WaitSIG, has no meaning.  When VgTs_WaitSIG,
      is the set of signals for which we are sigwait()ing. */
   vki_ksigset_t sigs_waited_for;

   /* Counts the number of times a signal handler for this thread
      has returned.  This makes it easy to implement pause(), by
      polling this value, of course interspersed with nanosleeps,
      and waiting till it changes. */
   UInt n_signals_returned;

   /* Stacks.  When a thread slot is freed, we don't deallocate its
      stack; we just leave it lying around for the next use of the
      slot.  If the next use of the slot requires a larger stack,
      only then is the old one deallocated and a new one
      allocated. 

      For the main thread (threadid == 0), this mechanism doesn't
      apply.  We don't know the size of the stack since we didn't
      allocate it, and furthermore we never reallocate it. */

   /* The allocated size of this thread's stack (permanently zero
      if this is ThreadId == 0, since we didn't allocate its stack) */
   UInt stack_size;

   /* Address of the lowest word in this thread's stack.  NULL means
      not allocated yet.
   */
   Addr stack_base;

   /* Address of the highest legitimate word in this stack.  This is
      used for error messages only -- not critical for execution
      correctness.  Is is set for all stacks, specifically including
      ThreadId == 0 (the main thread). */
   Addr stack_highest_word;

   /* Pointer to this thread's Local (Segment) Descriptor Table.
      Starts out as NULL, indicating there is no table, and we hope to
      keep it that way.  If the thread does __NR_modify_ldt to create
      entries, we allocate a 8192-entry table at that point.  This is
      a straight copy of the Linux kernel's scheme.  Don't forget to
      deallocate this at thread exit. */
   VgLdtEntry* ldt;

   /* Saved machine context.  Note the FPU state, %EIP and segment
      registers are not shadowed.

      Although the segment registers are 16 bits long, storage
      management here, in VG_(baseBlock) and in VG_(m_state_static) is
      simplified if we pretend they are 32 bits. */
   UInt m_cs;
   UInt m_ss;
   UInt m_ds;
   UInt m_es;
   UInt m_fs;
   UInt m_gs;

   UInt m_eax;
   UInt m_ebx;
   UInt m_ecx;
   UInt m_edx;
   UInt m_esi;
   UInt m_edi;
   UInt m_ebp;
   UInt m_esp;
   UInt m_eflags;
   UInt m_eip;
   UInt m_fpu[VG_SIZE_OF_FPUSTATE_W];

   UInt sh_eax;
   UInt sh_ebx;
   UInt sh_ecx;
   UInt sh_edx;
   UInt sh_esi;
   UInt sh_edi;
   UInt sh_ebp;
   UInt sh_esp;
   UInt sh_eflags;
};


/* The thread table. */
extern ThreadState VG_(threads)[VG_N_THREADS];

/* Check that tid is in range and denotes a non-Empty thread. */
extern Bool VG_(is_valid_tid) ( ThreadId tid );

/* Check that tid is in range. */
extern Bool VG_(is_valid_or_empty_tid) ( ThreadId tid );

/* Copy the specified thread's state into VG_(baseBlock) in
   preparation for running it. */
extern void VG_(load_thread_state)( ThreadId );

/* Save the specified thread's state back in VG_(baseBlock), and fill
   VG_(baseBlock) with junk, for sanity-check reasons. */
extern void VG_(save_thread_state)( ThreadId );

/* And for the currently running one, if valid. */
extern ThreadState* VG_(get_current_thread_state) ( void );

/* Similarly ... */
extern ThreadId VG_(get_current_tid) ( void );

/* Nuke all threads except tid. */
extern void VG_(nuke_all_threads_except) ( ThreadId me );


/* Return codes from the scheduler. */
typedef
   enum { 
      VgSrc_Deadlock,    /* no runnable threads and no prospect of any
                            even if we wait for a long time */
      VgSrc_ExitSyscall, /* client called exit().  This is the normal
                            route out. */
      VgSrc_BbsDone      /* In a debugging run, the specified number of
                            bbs has been completed. */
   }
   VgSchedReturnCode;


/* The scheduler. */
extern VgSchedReturnCode VG_(scheduler) ( void );

extern void VG_(scheduler_init) ( void );

extern void VG_(pp_sched_status) ( void );

/* vg_oursignalhandler() might longjmp().  Here's the jmp_buf. */
extern jmp_buf VG_(scheduler_jmpbuf);
/* This says whether scheduler_jmpbuf is actually valid.  Needed so
   that our signal handler doesn't longjmp when the buffer isn't
   actually valid. */
extern Bool    VG_(scheduler_jmpbuf_valid);
/* ... and if so, here's the signal which caused it to do so. */
extern Int     VG_(longjmpd_on_signal);


/* Possible places where the main stack might be based.  We check that
   the initial stack, which we can't move, is allocated here.
   VG_(scheduler_init) checks this.  Andrea Archelangi's 2.4 kernels
   have been rumoured to start stacks at 0x80000000, so that too is
   considered.  It seems systems with longer uptimes tend to to use
   stacks which start at 0x40000000 sometimes.  JRS 2002-Aug-21: I
   also have reports of stacks starting at 0xE0000000.*/

#define VG_STARTUP_STACK_BASE_1  (Addr)0xC0000000
#define VG_STARTUP_STACK_BASE_2  (Addr)0x80000000
#define VG_STARTUP_STACK_BASE_3  (Addr)0x40000000
#define VG_STARTUP_STACK_BASE_4  (Addr)0xE0000000
#define VG_STARTUP_STACK_SMALLERTHAN  0x100000 /* 1024k */

#define VG_STACK_MATCHES_BASE(zzstack, zzbase)                 \
   (                                                           \
      ((zzstack) & ((zzbase) - VG_STARTUP_STACK_SMALLERTHAN))  \
      ==                                                       \
      ((zzbase) - VG_STARTUP_STACK_SMALLERTHAN)                \
   )


/* The red-zone size which we put at the bottom (highest address) of
   thread stacks, for paranoia reasons.  This can be arbitrary, and
   doesn't really need to be set at compile time. */
#define VG_AR_CLIENT_STACKBASE_REDZONE_SZW 4

#define VG_AR_CLIENT_STACKBASE_REDZONE_SZB \
   (VG_AR_CLIENT_STACKBASE_REDZONE_SZW * VKI_BYTES_PER_WORD)

/* Junk to fill up a thread's shadow regs with when shadow regs aren't
 * being used. */
#define VG_UNUSED_SHADOW_REG_VALUE  0x27182818

/* What we set a shadow register to when written by SET_EAX and similar
 * things. */
extern UInt VG_(written_shadow_reg);

/* Write a value to the client's %EDX (request return value register)
   and set the shadow to indicate it is defined. */
#define SET_EDX(zztid, zzval)                                  \
   do { VG_(threads)[zztid].m_edx = (zzval);                   \
        VG_(threads)[zztid].sh_edx = VG_(written_shadow_reg);  \
   } while (0)

#define SET_EAX(zztid, zzval)                                  \
   do { VG_(threads)[zztid].m_eax = (zzval);                   \
        VG_(threads)[zztid].sh_eax = VG_(written_shadow_reg);  \
   } while (0)


/* ---------------------------------------------------------------------
   Exports of vg_signals.c
   ------------------------------------------------------------------ */

extern void VG_(sigstartup_actions) ( void );

extern Bool VG_(deliver_signals) ( void );
extern void VG_(unblock_host_signal) ( Int sigNo );
extern void VG_(handle_SCSS_change) ( Bool force_update );


/* Fake system calls for signal handling. */
extern void VG_(do__NR_sigaltstack)   ( ThreadId tid );
extern void VG_(do__NR_sigaction)     ( ThreadId tid );
extern void VG_(do__NR_sigprocmask)   ( ThreadId tid,
                                        Int how, 
                                        vki_ksigset_t* set,
                                        vki_ksigset_t* oldset );
extern void VG_(do_pthread_sigmask_SCSS_upd) ( ThreadId tid,
                                               Int how, 
                                               vki_ksigset_t* set,
                                               vki_ksigset_t* oldset );
extern void VG_(send_signal_to_thread) ( ThreadId thread,
                                         Int signo );

extern void VG_(do_sigpending) ( ThreadId tid, vki_ksigset_t* set );


/* Modify the current thread's state once we have detected it is
   returning from a signal handler. */
extern Bool VG_(signal_returns) ( ThreadId );

/* Handy utilities to block/restore all host signals. */
extern void VG_(block_all_host_signals) 
                  ( /* OUT */ vki_ksigset_t* saved_mask );
extern void VG_(restore_all_host_signals) 
                  ( /* IN */ vki_ksigset_t* saved_mask );

/* ---------------------------------------------------------------------
   Exports of vg_mylibc.c
   ------------------------------------------------------------------ */

#define vg_assert(expr)                                               \
  ((void) ((expr) ? 0 :						      \
	   (VG_(core_assert_fail) (VG__STRING(expr),	              \
			           __FILE__, __LINE__,                \
                                   __PRETTY_FUNCTION__), 0)))
__attribute__ ((__noreturn__))
extern void VG_(core_assert_fail) ( Char* expr, Char* file, 
                                    Int line, Char* fn );
__attribute__ ((__noreturn__))
extern void  VG_(core_panic)      ( Char* str );

/* VG_(brk) not public so skins cannot screw with curr_dataseg_end */
extern void* VG_(brk) ( void* end_data_segment );

/* Skins use VG_(strdup)() which doesn't expose ArenaId */
extern Char* VG_(arena_strdup) ( ArenaId aid, const Char* s);

/* Skins shouldn't need these...(?) */
extern void VG_(start_rdtsc_calibration) ( void );
extern void VG_(end_rdtsc_calibration) ( void );
extern UInt VG_(read_millisecond_timer) ( void );

extern Int VG_(fcntl) ( Int fd, Int cmd, Int arg );
extern Int VG_(select)( Int n, 
                        vki_fd_set* readfds, 
                        vki_fd_set* writefds, 
                        vki_fd_set* exceptfds, 
                        struct vki_timeval * timeout );
extern Int VG_(nanosleep)( const struct vki_timespec *req, 
                           struct vki_timespec *rem );

/* ---------------------------------------------------------------------
   Definitions for the JITter (vg_translate.c, vg_to_ucode.c,
   vg_from_ucode.c).
   ------------------------------------------------------------------ */

#define VG_IS_FLAG_SUBSET(set1,set2) \
   (( ((FlagSet)set1) & ((FlagSet)set2) ) == ((FlagSet)set1) )

#define VG_UNION_FLAG_SETS(set1,set2) \
   ( ((FlagSet)set1) | ((FlagSet)set2) )

/* ---------------------------------------------------------------------
   Exports of vg_demangle.c
   ------------------------------------------------------------------ */

extern void VG_(demangle) ( Char* orig, Char* result, Int result_size );

/* ---------------------------------------------------------------------
   Exports of vg_from_ucode.c
   ------------------------------------------------------------------ */

extern UChar* VG_(emit_code) ( UCodeBlock* cb, Int* nbytes );

extern void   VG_(print_ccall_stats)      ( void );
extern void   VG_(print_UInstr_histogram) ( void );

/* ---------------------------------------------------------------------
   Exports of vg_to_ucode.c
   ------------------------------------------------------------------ */

extern Int   VG_(disBB)          ( UCodeBlock* cb, Addr eip0 );

/* ---------------------------------------------------------------------
   Exports of vg_translate.c
   ------------------------------------------------------------------ */

extern void  VG_(translate)  ( ThreadState* tst,
                               Addr  orig_addr,
                               UInt* orig_size,
                               Addr* trans_addr,
                               UInt* trans_size );

extern Char* VG_(nameCondcode)        ( Condcode cond );
extern Bool  VG_(saneUInstr)          ( Bool beforeRA, Bool beforeLiveness,
                                        UInstr* u );
extern void  VG_(saneUCodeBlock)      ( UCodeBlock* cb );
extern Bool  VG_(saneUCodeBlockCalls) ( UCodeBlock* cb );

/* ---------------------------------------------------------------------
   Exports of vg_execontext.c.
   ------------------------------------------------------------------ */

/* Records the PC and a bit of the call chain.  The first 4 %eip
   values are used in comparisons do remove duplicate errors, and for
   comparing against suppression specifications.  The rest are purely
   informational (but often important). */

struct _ExeContext {
   struct _ExeContext * next;
   /* Variable-length array.  The size is VG_(clo_backtrace_size); at
      least 2, at most VG_DEEPEST_BACKTRACE.  [0] is the current %eip,
      [1] is its caller, [2] is the caller of [1], etc. */
   Addr eips[0];
};


/* Initialise the ExeContext storage mechanism. */
extern void VG_(init_ExeContext_storage) ( void );

/* Print stats (informational only). */
extern void VG_(show_ExeContext_stats) ( void );

/* Like VG_(get_ExeContext), but with a slightly different type */
extern ExeContext* VG_(get_ExeContext2) ( Addr eip, Addr ebp,
                                          Addr ebp_min, Addr ebp_max );


/* ---------------------------------------------------------------------
   Exports of vg_errcontext.c.
   ------------------------------------------------------------------ */

/* Note: it is imperative this doesn't overlap with (0..) at all, as skins
 * effectively extend it by defining their own enums in the (0..) range. */
typedef
   enum {
      PThreadSupp = -1,    /* Matches PThreadErr */
   }
   CoreSuppKind;

/* For each caller specified for a suppression, record the nature of
   the caller name.  Not of interest to skins. */
typedef
   enum { 
      ObjName,    /* Name is of an shared object file. */
      FunName     /* Name is of a function. */
   }
   SuppLocTy;

/* Suppressions.  Skin part `SkinSupp' (which is all skins have to deal
   with) is in vg_skin.h */
typedef
   struct _CoreSupp {
      struct _CoreSupp* next;
      /* The number of times this error has been suppressed. */
      Int count;
      /* The name by which the suppression is referred to. */
      Char* sname;
      /* First two (name of fn where err occurs, and immediate caller)
       * are mandatory;  extra two are optional. */
      SuppLocTy caller_ty[VG_N_SUPP_CALLERS];
      Char*     caller   [VG_N_SUPP_CALLERS];
      /* The skin-specific part */
      SkinSupp  skin_supp;
   } 
   CoreSupp;

/* Note: it is imperative this doesn't overlap with (0..) at all, as skins
 * effectively extend it by defining their own enums in the (0..) range. */
typedef
   enum { 
      PThreadErr      = -1,   /* Pthreading error */
   }
   CoreErrorKind;

/* Errors.  Skin part `SkinError' (which is all skins have to deal
   with) is in vg_skin.h */
typedef
   struct _CoreErrContext {
      struct _CoreErrContext* next;
      /* NULL if unsuppressed; or ptr to suppression record. */
      CoreSupp* supp;
      Int count;
      ExeContext* where;
      ThreadId tid;
      /* These record %EIP, %ESP and %EBP at the error point.  They
         are only used to make GDB-attaching convenient; there is no
         other purpose; specifically they are not used to do
         comparisons between errors. */
      UInt m_eip;
      UInt m_esp;
      UInt m_ebp;
      /* The skin-specific part */
      SkinError skin_err;
   } 
   CoreError;


extern void VG_(load_suppressions)    ( void );

extern void VG_(record_pthread_error) ( ThreadId tid, Char* msg );

extern void VG_(show_all_errors)      ( void );

/* ---------------------------------------------------------------------
   Exports of vg_procselfmaps.c
   ------------------------------------------------------------------ */

extern 
void VG_(read_procselfmaps) (
   void (*record_mapping)( Addr, UInt, Char, Char, Char, UInt, UChar* )
);


/* ---------------------------------------------------------------------
   Exports of vg_symtab2.c
   ------------------------------------------------------------------ */

/* We assume the executable is loaded here ... can't really find
   out.  There is a hacky sanity check in VG_(init_memory)()
   which should trip up most stupidities.
*/
#define VG_ASSUMED_EXE_BASE  (Addr)0x8048000

extern void VG_(maybe_read_symbols)   ( void );
extern void VG_(read_symtab_callback) ( Addr start, UInt size, 
                                        Char rr, Char ww, Char xx,
                                        UInt foffset, UChar* filename );
extern void VG_(maybe_unload_symbols) ( Addr start, UInt length );

extern Bool VG_(get_fnname_nodemangle)( Addr a, Char* fnname, Int n_fnname );
extern void VG_(mini_stack_dump)      ( ExeContext* ec );


/* ---------------------------------------------------------------------
   Exports of vg_clientmalloc.c
   ------------------------------------------------------------------ */

extern void  VG_(client_malloc_init)();

/* These are called from the scheduler, when it intercepts a user
   request. */
extern void* VG_(client_malloc)   ( ThreadState* tst, 
                                    UInt size, VgAllocKind kind );
extern void* VG_(client_memalign) ( ThreadState* tst, 
                                    UInt align, UInt size );
extern void  VG_(client_free)     ( ThreadState* tst, 
                                    void* ptrV, VgAllocKind  kind );
extern void* VG_(client_calloc)   ( ThreadState* tst, 
                                    UInt nmemb, UInt size1 );
extern void* VG_(client_realloc)  ( ThreadState* tst, 
                                    void* ptrV, UInt size_new );


/* ---------------------------------------------------------------------
   Exports of vg_main.c
   ------------------------------------------------------------------ */

/* Sanity checks which may be done at any time.  The scheduler decides when. */
extern void VG_(do_sanity_checks) ( Bool force_expensive );

/* A structure used as an intermediary when passing the simulated
   CPU's state to some assembly fragments, particularly system calls.
   Stuff is copied from baseBlock to here, the assembly magic runs,
   and then the inverse copy is done. 
 */
extern UInt VG_(m_state_static) [6 /* segment regs, Intel order */
                                 + 8 /* int regs, in Intel order */ 
                                 + 1 /* %eflags */ 
                                 + 1 /* %eip */
                                 + VG_SIZE_OF_FPUSTATE_W /* FPU state */
                                ];

/* Handy fns for doing the copy back and forth. */
extern void VG_(copy_baseBlock_to_m_state_static) ( void );
extern void VG_(copy_m_state_static_to_baseBlock) ( void );

/* Called when some unhandleable client behaviour is detected.
   Prints a msg and aborts. */
extern void VG_(unimplemented) ( Char* msg )
            __attribute__((__noreturn__));

/* The stack on which Valgrind runs.  We can't use the same stack as the
   simulatee -- that's an important design decision.  */
extern UInt VG_(stack)[10000];

/* Similarly, we have to ask for signals to be delivered on an alternative
   stack, since it is possible, although unlikely, that we'll have to run
   client code from inside the Valgrind-installed signal handler.  If this
   happens it will be done by vg_deliver_signal_immediately(). */
extern UInt VG_(sigstack)[10000];

/* Holds client's %esp at the point we gained control.  From this the
   client's argc, argv and envp are deduced. */
extern Addr   VG_(esp_at_startup);

/* Remove valgrind.so and skin's .so from a LD_PRELOAD=... string so child
   processes don't get traced into.  Also mess up $libdir/valgrind so that
   our libpthread.so disappears from view. */
void VG_(mash_LD_PRELOAD_and_LD_LIBRARY_PATH) ( Char* ld_preload_str,
                                                Char* ld_library_path_str );

/* Something of a function looking for a home ... start up GDB.  This
   is called from VG_(swizzle_esp_then_start_GDB) and so runs on the
   *client's* stack.  This is necessary to give GDB the illusion that
   the client program really was running on the real cpu. */
extern void VG_(start_GDB_whilst_on_client_stack) ( void );

/* VG_(bbs_done) in include/vg_skin.h */

/* 64-bit counter for the number of bbs to go before a debug exit. */
extern ULong VG_(bbs_to_go);

/* Counts downwards in vg_run_innerloop. */
extern UInt VG_(dispatch_ctr);

/* Is the client running on the simulated CPU or the real one? */
extern Bool VG_(running_on_simd_CPU); /* Initially False */

/* The current LRU epoch. */
extern UInt VG_(current_epoch);

/* This is the ThreadId of the last thread the scheduler ran. */
extern ThreadId VG_(last_run_tid);

/* This is the argument to __NR_exit() supplied by the first thread to
   call that syscall.  We eventually pass that to __NR_exit() for
   real. */
extern UInt VG_(exitcode);


/* --- Counters, for informational purposes only. --- */

/* Number of lookups which miss the fast tt helper. */
extern UInt VG_(tt_fast_misses);

/* Counts for LRU informational messages. */

/* Number and total o/t size of new translations this epoch. */
extern UInt VG_(this_epoch_in_count);
extern UInt VG_(this_epoch_in_osize);
extern UInt VG_(this_epoch_in_tsize);
/* Number and total o/t size of discarded translations this epoch. */
extern UInt VG_(this_epoch_out_count);
extern UInt VG_(this_epoch_out_osize);
extern UInt VG_(this_epoch_out_tsize);
/* Number and total o/t size of translations overall. */
extern UInt VG_(overall_in_count);
extern UInt VG_(overall_in_osize);
extern UInt VG_(overall_in_tsize);
/* Number and total o/t size of discards overall. */
extern UInt VG_(overall_out_count);
extern UInt VG_(overall_out_osize);
extern UInt VG_(overall_out_tsize);

/* The number of LRU-clearings of TT/TC. */
extern UInt VG_(number_of_lrus);

/* Counts pertaining to the register allocator. */

/* total number of uinstrs input to reg-alloc */
extern UInt VG_(uinstrs_prealloc);

/* total number of uinstrs added due to spill code */
extern UInt VG_(uinstrs_spill);

/* number of bbs requiring spill code */
extern UInt VG_(translations_needing_spill);

/* total of register ranks over all translations */
extern UInt VG_(total_reg_rank);

/* Counts pertaining to internal sanity checking. */
extern UInt VG_(sanity_fast_count);
extern UInt VG_(sanity_slow_count);

/* Counts pertaining to the scheduler. */
extern UInt VG_(num_scheduling_events_MINOR);
extern UInt VG_(num_scheduling_events_MAJOR);


/* ---------------------------------------------------------------------
   Exports of vg_memory.c
   ------------------------------------------------------------------ */

extern void VG_(init_memory)            ( void );
extern void VG_(new_exe_segment)        ( Addr a, UInt len );
extern void VG_(remove_if_exe_segment)  ( Addr a, UInt len );

/* Called from generated code. */
extern void VG_(handle_esp_assignment) ( Addr new_espA );

/* Nasty kludgery to deal with applications which switch stacks,
   like netscape. */
#define VG_PLAUSIBLE_STACK_SIZE 8000000

/* ---------------------------------------------------------------------
   Exports of vg_syscalls.c
   ------------------------------------------------------------------ */

extern void VG_(init_dataseg_end_for_brk) ( void );

extern void VG_(perform_assumed_nonblocking_syscall) ( ThreadId tid );

extern void* VG_(pre_known_blocking_syscall) ( ThreadId tid, Int syscallno );
extern void  VG_(post_known_blocking_syscall)( ThreadId tid, Int syscallno,
                                               void* pre_res, Int res );

extern Bool VG_(is_kerror) ( Int res );

#define KERNEL_DO_SYSCALL(thread_id, result_lvalue)               \
         VG_(load_thread_state)(thread_id);                       \
         VG_(copy_baseBlock_to_m_state_static)();                 \
         VG_(do_syscall)();                                       \
         VG_(copy_m_state_static_to_baseBlock)();                 \
         VG_(save_thread_state)(thread_id);                       \
         VG_(threads)[thread_id].sh_eax = VG_(written_shadow_reg);\
         result_lvalue = VG_(threads)[thread_id].m_eax;


/* ---------------------------------------------------------------------
   Exports of vg_transtab.c
   ------------------------------------------------------------------ */

/* An entry in the translation table (TT). */
typedef
   struct {
      /* +0 */  Addr   orig_addr;
      /* +4 */  Addr   trans_addr;
      /* +8 */  UInt   mru_epoch;
      /* +12 */ UShort orig_size;
      /* +14 */ UShort trans_size;
   }
   TTEntry;

/* The number of basic blocks in an epoch (one age-step). */
#define VG_BBS_PER_EPOCH 20000

/* The fast-cache for tt-lookup. */
extern Addr VG_(tt_fast)[VG_TT_FAST_SIZE];

extern void VG_(get_tt_tc_used) ( UInt* tt_used, UInt* tc_used );
extern void VG_(maybe_do_lru_pass) ( void );
extern void VG_(flush_transtab) ( void );
extern Addr VG_(copy_to_transcache) ( Addr trans_addr, Int trans_size );
extern void VG_(add_to_trans_tab) ( TTEntry* tte );
extern void VG_(invalidate_translations) ( Addr start, UInt range );

extern void VG_(init_tt_tc) ( void );

extern void VG_(sanity_check_tc_tt) ( void );
extern Addr VG_(search_transtab) ( Addr original_addr );

extern void VG_(invalidate_tt_fast)( void );


/* ---------------------------------------------------------------------
   Exports of vg_syscall.S
   ------------------------------------------------------------------ */

extern void VG_(do_syscall) ( void );


/* ---------------------------------------------------------------------
   Exports of vg_startup.S
   ------------------------------------------------------------------ */

extern void VG_(switch_to_real_CPU) ( void );

extern void VG_(swizzle_esp_then_start_GDB) ( Addr m_eip_at_error,
                                              Addr m_esp_at_error,
                                              Addr m_ebp_at_error );


/* ---------------------------------------------------------------------
   Exports of vg_dispatch.S
   ------------------------------------------------------------------ */

/* Run a thread for a (very short) while, until some event happens
   which means we need to defer to the scheduler. */
extern UInt VG_(run_innerloop) ( void );


/* ---------------------------------------------------------------------
   Exports of vg_helpers.S
   ------------------------------------------------------------------ */

/* Mul, div, etc, -- we don't codegen these directly. */
extern void VG_(helper_idiv_64_32);
extern void VG_(helper_div_64_32);
extern void VG_(helper_idiv_32_16);
extern void VG_(helper_div_32_16);
extern void VG_(helper_idiv_16_8);
extern void VG_(helper_div_16_8);

extern void VG_(helper_imul_32_64);
extern void VG_(helper_mul_32_64);
extern void VG_(helper_imul_16_32);
extern void VG_(helper_mul_16_32);
extern void VG_(helper_imul_8_16);
extern void VG_(helper_mul_8_16);

extern void VG_(helper_CLD);
extern void VG_(helper_STD);
extern void VG_(helper_get_dirflag);

extern void VG_(helper_CLC);
extern void VG_(helper_STC);

extern void VG_(helper_shldl);
extern void VG_(helper_shldw);
extern void VG_(helper_shrdl);
extern void VG_(helper_shrdw);

extern void VG_(helper_RDTSC);
extern void VG_(helper_CPUID);

extern void VG_(helper_bsf);
extern void VG_(helper_bsr);

extern void VG_(helper_fstsw_AX);
extern void VG_(helper_SAHF);
extern void VG_(helper_DAS);
extern void VG_(helper_DAA);

/* NOT A FUNCTION; this is a bogus RETURN ADDRESS. */
extern void VG_(signalreturn_bogusRA)( void );

/* ---------------------------------------------------------------------
   Things relating to the used skin
   ------------------------------------------------------------------ */

#define VG_TRACK(fn, args...)          \
   do {                                \
      if (VG_(track_events).fn)        \
         VG_(track_events).fn(args);   \
   } while (0)


/* ---------------------------------------------------------------------
   The state of the simulated CPU.
   ------------------------------------------------------------------ */

/* ---------------------------------------------------------------------
   Offsets into baseBlock for everything which needs to referred to
   from generated code.  The order of these decls does not imply 
   what the order of the actual offsets is.  The latter is important
   and is set up in vg_main.c.
   ------------------------------------------------------------------ */

/* An array of words.  In generated code, %ebp always points to the
   start of this array.  Useful stuff, like the simulated CPU state,
   and the addresses of helper functions, can then be found by
   indexing off %ebp.  The following declares variables which, at
   startup time, are given values denoting offsets into baseBlock.
   These offsets are in *words* from the start of baseBlock. */

#define VG_BASEBLOCK_WORDS 200

extern UInt VG_(baseBlock)[VG_BASEBLOCK_WORDS];


/* -----------------------------------------------------
   Read-write parts of baseBlock.
   -------------------------------------------------- */

/* State of the simulated CPU. */
extern Int VGOFF_(m_eax);
extern Int VGOFF_(m_ecx);
extern Int VGOFF_(m_edx);
extern Int VGOFF_(m_ebx);
extern Int VGOFF_(m_esp);
extern Int VGOFF_(m_ebp);
extern Int VGOFF_(m_esi);
extern Int VGOFF_(m_edi);
extern Int VGOFF_(m_eflags);
extern Int VGOFF_(m_fpustate);
extern Int VGOFF_(m_eip);

extern Int VGOFF_(m_cs);
extern Int VGOFF_(m_ss);
extern Int VGOFF_(m_ds);
extern Int VGOFF_(m_es);
extern Int VGOFF_(m_fs);
extern Int VGOFF_(m_gs);

/* Reg-alloc spill area (VG_MAX_SPILLSLOTS words long). */
extern Int VGOFF_(spillslots);

/* Records the valid bits for the 8 integer regs & flags reg. */
extern Int VGOFF_(sh_eax);
extern Int VGOFF_(sh_ecx);
extern Int VGOFF_(sh_edx);
extern Int VGOFF_(sh_ebx);
extern Int VGOFF_(sh_esp);
extern Int VGOFF_(sh_ebp);
extern Int VGOFF_(sh_esi);
extern Int VGOFF_(sh_edi);
extern Int VGOFF_(sh_eflags);

/* -----------------------------------------------------
   Read-only parts of baseBlock.
   -------------------------------------------------- */

/* This thread's LDT pointer. */
extern Int VGOFF_(ldt);

/* Offsets of addresses of helper functions.  A "helper" function is
   one which is called from generated code. */

extern Int VGOFF_(helper_idiv_64_32);
extern Int VGOFF_(helper_div_64_32);
extern Int VGOFF_(helper_idiv_32_16);
extern Int VGOFF_(helper_div_32_16);
extern Int VGOFF_(helper_idiv_16_8);
extern Int VGOFF_(helper_div_16_8);

extern Int VGOFF_(helper_imul_32_64);
extern Int VGOFF_(helper_mul_32_64);
extern Int VGOFF_(helper_imul_16_32);
extern Int VGOFF_(helper_mul_16_32);
extern Int VGOFF_(helper_imul_8_16);
extern Int VGOFF_(helper_mul_8_16);

extern Int VGOFF_(helper_CLD);
extern Int VGOFF_(helper_STD);
extern Int VGOFF_(helper_get_dirflag);

extern Int VGOFF_(helper_CLC);
extern Int VGOFF_(helper_STC);

extern Int VGOFF_(helper_shldl);
extern Int VGOFF_(helper_shldw);
extern Int VGOFF_(helper_shrdl);
extern Int VGOFF_(helper_shrdw);

extern Int VGOFF_(helper_RDTSC);
extern Int VGOFF_(helper_CPUID);

extern Int VGOFF_(helper_bsf);
extern Int VGOFF_(helper_bsr);

extern Int VGOFF_(helper_fstsw_AX);
extern Int VGOFF_(helper_SAHF);
extern Int VGOFF_(helper_DAS);
extern Int VGOFF_(helper_DAA);

extern Int VGOFF_(handle_esp_assignment); /* :: Addr -> void */

/* For storing extension-specific helpers, determined at runtime.  The addr 
 * and offset arrays together form a (addr, offset) map that allows a 
 * helper's baseBlock offset to be computed from its address.  It's done 
 * like this so CCALL_M_Ns and other helper calls can use the function 
 * address rather than having to much around with offsets. */
extern UInt VG_(n_compact_helpers);
extern UInt VG_(n_noncompact_helpers);

extern Addr VG_(compact_helper_addrs)  [];
extern Int  VG_(compact_helper_offsets)[];

extern Addr VG_(noncompact_helper_addrs)  [];
extern Int  VG_(noncompact_helper_offsets)[];

#define VGL_(x)		vgIntercept_##x

#endif /* ndef __VG_INCLUDE_H */


/* ---------------------------------------------------------------------
   Finally - autoconf-generated settings
   ------------------------------------------------------------------ */

#include "config.h"

/*--------------------------------------------------------------------*/
/*--- end                                             vg_include.h ---*/
/*--------------------------------------------------------------------*/