vg_constants.h

/*--------------------------------------------------------------------*/
/*--- A header file containing constants (for assembly code).      ---*/
/*---                                               vg_constants.h ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of Valgrind, an x86 protected-mode emulator 
   designed for debugging and profiling binaries on x86-Unixes.

   Copyright (C) 2000-2002 Julian Seward 
      jseward@acm.org
      Julian_Seward@muraroa.demon.co.uk

   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 LICENSE.
*/

#ifndef __VG_CONSTANTS_H
#define __VG_CONSTANTS_H


/* This file is included in all Valgrind source files, including
   assembly ones. */

/* All symbols externally visible from valgrind.so are prefixed
   as specified here.  The prefix can be changed, so as to avoid
   namespace conflict problems.
*/
#define VGAPPEND(str1,str2) str1##str2

/* These macros should add different prefixes so the same base
   name can safely be used across different macros. */
#define VG_(str)    VGAPPEND(vgPlain_,str)
#define VGM_(str)   VGAPPEND(vgMem_,str)
#define VGP_(str)   VGAPPEND(vgProf_,str)
#define VGOFF_(str) VGAPPEND(vgOff_,str)

/* Reasons why the inner simulation loop might stop (i.e. why has
   vg_dispatch_ctr reached zero? */
#define VG_Y_SIGCHECK   0     /* signal check due */
#define VG_Y_SMC        1     /* write to code detected */
#define VG_Y_EXIT       2     /* natural or debug end to simulation */
#define VG_Y_TRANSLATE  3     /* translation of vg_m_eip needed */

/* Check for pending signals every this-many jumps.  Since this
   happens in the region of once per millisecond, we also take the
   opportunity do do a bit of quick sanity checking at the same time.
   Look at the call sites of VG_(deliver_signals). */
#define VG_SIGCHECK_INTERVAL   1000

/* A ,agic values that %ebp might be set to when returning to the
   dispatcher.  The only other legitimate value is to point to the
   start of VG_(baseBlock). */
#define VG_EBP_DISPATCH_CHECKED 17

/* Debugging hack for assembly code ... sigh. */
#if 0
#define OYNK(nnn) pushal;  pushl $nnn; call VG_(oynk) ; addl $4,%esp; popal
#else
#define OYNK(nnn)
#endif

#if 1
#define OYNNK(nnn) pushal;  pushl $nnn; call VG_(oynk) ; addl $4,%esp; popal
#else
#define OYNNK(nnn)
#endif

/* Constants for the fast translation lookup cache. */
#define VG_TT_FAST_BITS 15
#define VG_TT_FAST_SIZE (1 << VG_TT_FAST_BITS)
#define VG_TT_FAST_MASK ((VG_TT_FAST_SIZE) - 1)

/* Constants for the fast original-code-write check cache. */

/* Usually you want this to be zero. */
#define VG_SMC_FASTCHECK_IN_C 0

#define VG_SMC_CACHE_BITS  19
#define VG_SMC_CACHE_SIZE  (1 << VG_SMC_CACHE_BITS)
#define VG_SMC_CACHE_MASK  ((VG_SMC_CACHE_SIZE) - 1)

#define VG_SMC_CACHE_SHIFT 6


#endif /* ndef __VG_INCLUDE_H */

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/*--- end                                           vg_constants.h ---*/
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