vex_main.c

The Valgrind distribution has multiple tools. The most popular is the memory checking tool (called M

/*---------------------------------------------------------------*/
/*---                                                         ---*/
/*--- This file (main/vex_main.c) is                          ---*/
/*--- Copyright (C) OpenWorks LLP.  All rights reserved.      ---*/
/*---                                                         ---*/
/*---------------------------------------------------------------*/

/*
   This file is part of LibVEX, a library for dynamic binary
   instrumentation and translation.

   Copyright (C) 2004-2006 OpenWorks LLP.  All rights reserved.

   This library is made available under a dual licensing scheme.

   If you link LibVEX against other code all of which is itself
   licensed under the GNU General Public License, version 2 dated June
   1991 ("GPL v2"), then you may use LibVEX under the terms of the GPL
   v2, as appearing in the file LICENSE.GPL.  If the file LICENSE.GPL
   is missing, you can obtain a copy of the GPL v2 from the Free
   Software Foundation Inc., 51 Franklin St, Fifth Floor, Boston, MA
   02110-1301, USA.

   For any other uses of LibVEX, you must first obtain a commercial
   license from OpenWorks LLP.  Please contact [e-mail]
   for information about commercial licensing.

   This software is provided by OpenWorks LLP "as is" and any express
   or implied warranties, including, but not limited to, the implied
   warranties of merchantability and fitness for a particular purpose
   are disclaimed.  In no event shall OpenWorks LLP be liable for any
   direct, indirect, incidental, special, exemplary, or consequential
   damages (including, but not limited to, procurement of substitute
   goods or services; loss of use, data, or profits; or business
   interruption) however caused and on any theory of liability,
   whether in contract, strict liability, or tort (including
   negligence or otherwise) arising in any way out of the use of this
   software, even if advised of the possibility of such damage.

   Neither the names of the U.S. Department of Energy nor the
   University of California nor the names of its contributors may be
   used to endorse or promote products derived from this software
   without prior written permission.
*/

#include "libvex.h"
#include "libvex_emwarn.h"
#include "libvex_guest_x86.h"
#include "libvex_guest_amd64.h"
#include "libvex_guest_arm.h"
#include "libvex_guest_ppc32.h"
#include "libvex_guest_ppc64.h"

#include "main/vex_globals.h"
#include "main/vex_util.h"
#include "host-generic/h_generic_regs.h"
#include "ir/iropt.h"

#include "host-x86/hdefs.h"
#include "host-amd64/hdefs.h"
#include "host-ppc/hdefs.h"

#include "guest-generic/bb_to_IR.h"
#include "guest-x86/gdefs.h"
#include "guest-amd64/gdefs.h"
#include "guest-arm/gdefs.h"
#include "guest-ppc/gdefs.h"


/* This file contains the top level interface to the library. */

/* --------- fwds ... --------- */

static Bool   are_valid_hwcaps ( VexArch arch, UInt hwcaps );
static HChar* show_hwcaps ( VexArch arch, UInt hwcaps );


/* --------- Initialise the library. --------- */

/* Exported to library client. */

const HChar* LibVEX_Version ( void )
{
return
#include "main/vex_svnversion.h"
    ;
}


/* Exported to library client. */

void LibVEX_default_VexControl ( /*OUT*/ VexControl* vcon )
{
   vcon->iropt_verbosity            = 0;
   vcon->iropt_level                = 2;
   vcon->iropt_precise_memory_exns  = False;
   vcon->iropt_unroll_thresh        = 120;
   vcon->guest_max_insns            = 60;
   vcon->guest_chase_thresh         = 10;
}


/* Exported to library client. */

void LibVEX_Init (
   /* failure exit function */
   __attribute__ ((noreturn))
   void (*failure_exit) ( void ),
   /* logging output function */
   void (*log_bytes) ( HChar*, Int nbytes ),
   /* debug paranoia level */
   Int debuglevel,
   /* Are we supporting valgrind checking? */
   Bool valgrind_support,
   /* Control ... */
   /*READONLY*/VexControl* vcon
)
{
   /* First off, do enough minimal setup so that the following
      assertions can fail in a sane fashion, if need be. */
   vex_failure_exit = failure_exit;
   vex_log_bytes    = log_bytes;

   /* Now it's safe to check parameters for sanity. */
   vassert(!vex_initdone);
   vassert(failure_exit);
   vassert(log_bytes);
   vassert(debuglevel >= 0);

   vassert(vcon->iropt_verbosity >= 0);
   vassert(vcon->iropt_level >= 0);
   vassert(vcon->iropt_level <= 2);
   vassert(vcon->iropt_unroll_thresh >= 0);
   vassert(vcon->iropt_unroll_thresh <= 400);
   vassert(vcon->guest_max_insns >= 1);
   vassert(vcon->guest_max_insns <= 100);
   vassert(vcon->guest_chase_thresh >= 0);
   vassert(vcon->guest_chase_thresh < vcon->guest_max_insns);

   /* Check that Vex has been built with sizes of basic types as
      stated in priv/libvex_basictypes.h.  Failure of any of these is
      a serious configuration error and should be corrected
      immediately.  If any of these assertions fail you can fully
      expect Vex not to work properly, if at all. */

   vassert(1 == sizeof(UChar));
   vassert(1 == sizeof(Char));
   vassert(2 == sizeof(UShort));
   vassert(2 == sizeof(Short));
   vassert(4 == sizeof(UInt));
   vassert(4 == sizeof(Int));
   vassert(8 == sizeof(ULong));
   vassert(8 == sizeof(Long));
   vassert(4 == sizeof(Float));
   vassert(8 == sizeof(Double));
   vassert(1 == sizeof(Bool));
   vassert(4 == sizeof(Addr32));
   vassert(8 == sizeof(Addr64));
   vassert(16 == sizeof(U128));

   vassert(sizeof(void*) == 4 || sizeof(void*) == 8);
   vassert(sizeof(void*) == sizeof(int*));
   vassert(sizeof(void*) == sizeof(HWord));

   vassert(VEX_HOST_WORDSIZE == sizeof(void*));
   vassert(VEX_HOST_WORDSIZE == sizeof(HWord));

   /* Really start up .. */
   vex_debuglevel         = debuglevel;
   vex_valgrind_support   = valgrind_support;
   vex_control            = *vcon;
   vex_initdone           = True;
   vexSetAllocMode ( VexAllocModeTEMP );
}


/* --------- Make a translation. --------- */

/* Exported to library client. */

VexTranslateResult LibVEX_Translate ( VexTranslateArgs* vta )
{
   /* This the bundle of functions we need to do the back-end stuff
      (insn selection, reg-alloc, assembly) whilst being insulated
      from the target instruction set. */
   HReg* available_real_regs;
   Int   n_available_real_regs;
   Bool         (*isMove)      ( HInstr*, HReg*, HReg* );
   void         (*getRegUsage) ( HRegUsage*, HInstr*, Bool );
   void         (*mapRegs)     ( HRegRemap*, HInstr*, Bool );
   HInstr*      (*genSpill)    ( HReg, Int, Bool );
   HInstr*      (*genReload)   ( HReg, Int, Bool );
   void         (*ppInstr)     ( HInstr*, Bool );
   void         (*ppReg)       ( HReg );
   HInstrArray* (*iselBB)      ( IRBB*, VexArch, VexArchInfo* );
   Int          (*emit)        ( UChar*, Int, HInstr*, Bool, void* );
   IRExpr*      (*specHelper)  ( HChar*, IRExpr** );
   Bool         (*preciseMemExnsFn) ( Int, Int );

   DisOneInstrFn disInstrFn;

   VexGuestLayout* guest_layout;
   Bool            host_is_bigendian = False;
   IRBB*           irbb;
   HInstrArray*    vcode;
   HInstrArray*    rcode;
   Int             i, j, k, out_used, guest_sizeB;
   Int             offB_TISTART, offB_TILEN;
   UChar           insn_bytes[32];
   IRType          guest_word_type;
   IRType          host_word_type;
   Bool            mode64;

   guest_layout           = NULL;
   available_real_regs    = NULL;
   n_available_real_regs  = 0;
   isMove                 = NULL;
   getRegUsage            = NULL;
   mapRegs                = NULL;
   genSpill               = NULL;
   genReload              = NULL;
   ppInstr                = NULL;
   ppReg                  = NULL;
   iselBB                 = NULL;
   emit                   = NULL;
   specHelper             = NULL;
   preciseMemExnsFn       = NULL;
   disInstrFn             = NULL;
   guest_word_type        = Ity_INVALID;
   host_word_type         = Ity_INVALID;
   offB_TISTART           = 0;
   offB_TILEN             = 0;
   mode64                 = False;

   vex_traceflags = vta->traceflags;

   vassert(vex_initdone);
   vexSetAllocModeTEMP_and_clear();
   vexAllocSanityCheck();

   /* First off, check that the guest and host insn sets
      are supported. */

   switch (vta->arch_host) {

      case VexArchX86:
         mode64      = False;
         getAllocableRegs_X86 ( &n_available_real_regs,
                                &available_real_regs );
         isMove      = (Bool(*)(HInstr*,HReg*,HReg*)) isMove_X86Instr;
         getRegUsage = (void(*)(HRegUsage*,HInstr*, Bool)) getRegUsage_X86Instr;
         mapRegs     = (void(*)(HRegRemap*,HInstr*, Bool)) mapRegs_X86Instr;
         genSpill    = (HInstr*(*)(HReg,Int, Bool)) genSpill_X86;
         genReload   = (HInstr*(*)(HReg,Int, Bool)) genReload_X86;
         ppInstr     = (void(*)(HInstr*, Bool)) ppX86Instr;
         ppReg       = (void(*)(HReg)) ppHRegX86;
         iselBB      = iselBB_X86;
         emit        = (Int(*)(UChar*,Int,HInstr*,Bool,void*)) emit_X86Instr;
         host_is_bigendian = False;
         host_word_type    = Ity_I32;
         vassert(are_valid_hwcaps(VexArchX86, vta->archinfo_host.hwcaps));
         vassert(vta->dispatch != NULL); /* jump-to-dispatcher scheme */
         break;

      case VexArchAMD64:
         mode64      = True;
         getAllocableRegs_AMD64 ( &n_available_real_regs,
                                  &available_real_regs );
         isMove      = (Bool(*)(HInstr*,HReg*,HReg*)) isMove_AMD64Instr;
         getRegUsage = (void(*)(HRegUsage*,HInstr*, Bool)) getRegUsage_AMD64Instr;
         mapRegs     = (void(*)(HRegRemap*,HInstr*, Bool)) mapRegs_AMD64Instr;
         genSpill    = (HInstr*(*)(HReg,Int, Bool)) genSpill_AMD64;
         genReload   = (HInstr*(*)(HReg,Int, Bool)) genReload_AMD64;
         ppInstr     = (void(*)(HInstr*, Bool)) ppAMD64Instr;
         ppReg       = (void(*)(HReg)) ppHRegAMD64;
         iselBB      = iselBB_AMD64;
         emit        = (Int(*)(UChar*,Int,HInstr*,Bool,void*)) emit_AMD64Instr;
         host_is_bigendian = False;
         host_word_type    = Ity_I64;
         vassert(are_valid_hwcaps(VexArchAMD64, vta->archinfo_host.hwcaps));
         vassert(vta->dispatch != NULL); /* jump-to-dispatcher scheme */
         break;

      case VexArchPPC32:
         mode64      = False;
         getAllocableRegs_PPC ( &n_available_real_regs,
                                &available_real_regs, mode64 );
         isMove      = (Bool(*)(HInstr*,HReg*,HReg*)) isMove_PPCInstr;
         getRegUsage = (void(*)(HRegUsage*,HInstr*,Bool)) getRegUsage_PPCInstr;
         mapRegs     = (void(*)(HRegRemap*,HInstr*,Bool)) mapRegs_PPCInstr;
         genSpill    = (HInstr*(*)(HReg,Int,Bool)) genSpill_PPC;
         genReload   = (HInstr*(*)(HReg,Int,Bool)) genReload_PPC;
         ppInstr     = (void(*)(HInstr*,Bool)) ppPPCInstr;
         ppReg       = (void(*)(HReg)) ppHRegPPC;
         iselBB      = iselBB_PPC;
         emit        = (Int(*)(UChar*,Int,HInstr*,Bool,void*)) emit_PPCInstr;
         host_is_bigendian = True;
         host_word_type    = Ity_I32;
         vassert(are_valid_hwcaps(VexArchPPC32, vta->archinfo_host.hwcaps));
         vassert(vta->dispatch == NULL); /* return-to-dispatcher scheme */
         break;

      case VexArchPPC64:
         mode64      = True;
         getAllocableRegs_PPC ( &n_available_real_regs,
                                &available_real_regs, mode64 );
         isMove      = (Bool(*)(HInstr*,HReg*,HReg*)) isMove_PPCInstr;
         getRegUsage = (void(*)(HRegUsage*,HInstr*, Bool)) getRegUsage_PPCInstr;
         mapRegs     = (void(*)(HRegRemap*,HInstr*, Bool)) mapRegs_PPCInstr;
         genSpill    = (HInstr*(*)(HReg,Int, Bool)) genSpill_PPC;
         genReload   = (HInstr*(*)(HReg,Int, Bool)) genReload_PPC;
         ppInstr     = (void(*)(HInstr*, Bool)) ppPPCInstr;
         ppReg       = (void(*)(HReg)) ppHRegPPC;
         iselBB      = iselBB_PPC;
         emit        = (Int(*)(UChar*,Int,HInstr*,Bool,void*)) emit_PPCInstr;
         host_is_bigendian = True;
         host_word_type    = Ity_I64;
         vassert(are_valid_hwcaps(VexArchPPC64, vta->archinfo_host.hwcaps));
         vassert(vta->dispatch == NULL); /* return-to-dispatcher scheme */
         break;

      default:
         vpanic("LibVEX_Translate: unsupported target insn set");
   }


   switch (vta->arch_guest) {

      case VexArchX86:
         preciseMemExnsFn = guest_x86_state_requires_precise_mem_exns;
         disInstrFn       = disInstr_X86;
         specHelper       = guest_x86_spechelper;
         guest_sizeB      = sizeof(VexGuestX86State);
         guest_word_type  = Ity_I32;
         guest_layout     = &x86guest_layout;
         offB_TISTART     = offsetof(VexGuestX86State,guest_TISTART);
         offB_TILEN       = offsetof(VexGuestX86State,guest_TILEN);
         vassert(are_valid_hwcaps(VexArchX86, vta->archinfo_guest.hwcaps));
         vassert(0 == sizeof(VexGuestX86State) % 8);
         vassert(sizeof( ((VexGuestX86State*)0)->guest_TISTART) == 4);
         vassert(sizeof( ((VexGuestX86State*)0)->guest_TILEN  ) == 4);
         vassert(sizeof( ((VexGuestX86State*)0)->guest_NRADDR ) == 4);
         break;

      case VexArchAMD64:
         preciseMemExnsFn = guest_amd64_state_requires_precise_mem_exns;
         disInstrFn       = disInstr_AMD64;
         specHelper       = guest_amd64_spechelper;
         guest_sizeB      = sizeof(VexGuestAMD64State);
         guest_word_type  = Ity_I64;
         guest_layout     = &amd64guest_layout;
         offB_TISTART     = offsetof(VexGuestAMD64State,guest_TISTART);
         offB_TILEN       = offsetof(VexGuestAMD64State,guest_TILEN);
         vassert(are_valid_hwcaps(VexArchAMD64, vta->archinfo_guest.hwcaps));
         vassert(0 == sizeof(VexGuestAMD64State) % 8);
         vassert(sizeof( ((VexGuestAMD64State*)0)->guest_TISTART ) == 8);
         vassert(sizeof( ((VexGuestAMD64State*)0)->guest_TILEN   ) == 8);
         vassert(sizeof( ((VexGuestAMD64State*)0)->guest_NRADDR  ) == 8);
         break;

      case VexArchARM:
         preciseMemExnsFn = guest_arm_state_requires_precise_mem_exns;
         disInstrFn       = NULL; /* HACK */
         specHelper       = guest_arm_spechelper;
         guest_sizeB      = sizeof(VexGuestARMState);
         guest_word_type  = Ity_I32;
         guest_layout     = &armGuest_layout;
         offB_TISTART     = 0; /* hack ... arm has bitrot */
         offB_TILEN       = 0; /* hack ... arm has bitrot */
         vassert(are_valid_hwcaps(VexArchARM, vta->archinfo_guest.hwcaps));
         break;

      case VexArchPPC32:
         preciseMemExnsFn = guest_ppc32_state_requires_precise_mem_exns;
         disInstrFn       = disInstr_PPC;
         specHelper       = guest_ppc32_spechelper;
         guest_sizeB      = sizeof(VexGuestPPC32State);
         guest_word_type  = Ity_I32;
         guest_layout     = &ppc32Guest_layout;
         offB_TISTART     = offsetof(VexGuestPPC32State,guest_TISTART);
         offB_TILEN       = offsetof(VexGuestPPC32State,guest_TILEN);
         vassert(are_valid_hwcaps(VexArchPPC32, vta->archinfo_guest.hwcaps));
         vassert(0 == sizeof(VexGuestPPC32State) % 8);
         vassert(sizeof( ((VexGuestPPC32State*)0)->guest_TISTART ) == 4);
         vassert(sizeof( ((VexGuestPPC32State*)0)->guest_TILEN   ) == 4);
         vassert(sizeof( ((VexGuestPPC32State*)0)->guest_NRADDR  ) == 4);
         break;

      case VexArchPPC64:
         preciseMemExnsFn = guest_ppc64_state_requires_precise_mem_exns;
         disInstrFn       = disInstr_PPC;
         specHelper       = guest_ppc64_spechelper;
         guest_sizeB      = sizeof(VexGuestPPC64State);
         guest_word_type  = Ity_I64;
         guest_layout     = &ppc64Guest_layout;
         offB_TISTART     = offsetof(VexGuestPPC64State,guest_TISTART);
         offB_TILEN       = offsetof(VexGuestPPC64State,guest_TILEN);
         vassert(are_valid_hwcaps(VexArchPPC64, vta->archinfo_guest.hwcaps));
         vassert(0 == sizeof(VexGuestPPC64State) % 16);
         vassert(sizeof( ((VexGuestPPC64State*)0)->guest_TISTART    ) == 8);
         vassert(sizeof( ((VexGuestPPC64State*)0)->guest_TILEN      ) == 8);
         vassert(sizeof( ((VexGuestPPC64State*)0)->guest_NRADDR     ) == 8);