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      1 
      2 /*--------------------------------------------------------------------*/
      3 /*--- Misc simple stuff lacking a better home.              misc.c ---*/
      4 /*--------------------------------------------------------------------*/
      5 
      6 /*
      7    This file is part of Valgrind, a dynamic binary instrumentation
      8    framework.
      9 
     10    Copyright (C) 2008-2017 OpenWorks LLP
     11       info (at) open-works.co.uk
     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, write to the Free Software
     25    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     26    02111-1307, USA.
     27 
     28    The GNU General Public License is contained in the file COPYING.
     29 
     30    Neither the names of the U.S. Department of Energy nor the
     31    University of California nor the names of its contributors may be
     32    used to endorse or promote products derived from this software
     33    without prior written permission.
     34 */
     35 
     36 #include "pub_core_basics.h"
     37 #include "pub_core_libcbase.h"
     38 #include "pub_core_libcassert.h"
     39 #include "pub_core_mallocfree.h"
     40 #include "pub_core_xarray.h"
     41 
     42 #include "priv_misc.h"            /* self */
     43 
     44 
     45 void* ML_(dinfo_zalloc) ( const HChar* cc, SizeT szB ) {
     46    void* v;
     47    vg_assert(szB > 0);
     48    v = VG_(arena_malloc)( VG_AR_DINFO, cc, szB );
     49    VG_(memset)(v, 0, szB);
     50    return v;
     51 }
     52 
     53 void  ML_(dinfo_shrink_block)( void* ptr, SizeT szB ) {
     54    VG_(arena_realloc_shrink)( VG_AR_DINFO, ptr, szB );
     55 }
     56 
     57 void ML_(dinfo_free) ( void* v ) {
     58    VG_(arena_free)( VG_AR_DINFO, v );
     59 }
     60 
     61 HChar* ML_(dinfo_strdup) ( const HChar* cc, const HChar* str ) {
     62    return VG_(arena_strdup)( VG_AR_DINFO, cc, str );
     63 }
     64 
     65 void* ML_(dinfo_memdup) ( const HChar* cc, const void* str, SizeT nStr ) {
     66    void* dst = VG_(arena_malloc)( VG_AR_DINFO, cc, nStr );
     67    VG_(memcpy)(dst, str, nStr);
     68    return dst;
     69 }
     70 
     71 void* ML_(dinfo_realloc) ( const HChar* cc, void* ptr, SizeT new_size ) {
     72    void* dst = VG_(arena_realloc)( VG_AR_DINFO, cc, ptr, new_size );
     73    vg_assert(dst);
     74    return dst;
     75 }
     76 
     77 static inline Bool host_is_little_endian ( void ) {
     78    UInt x = 0x76543210;
     79    UChar* p = (UChar*)(&x);
     80    return toBool(*p == 0x10);
     81 }
     82 
     83 Short ML_(readUAS_Short)( const UChar* data ) {
     84    Short r = 0;
     85    if (host_is_little_endian()) {
     86       r = data[0]
     87           | ( ((UInt)data[1]) << 8 );
     88    } else {
     89       r = data[1]
     90           | ( ((UInt)data[0]) << 8 );
     91    }
     92    return r;
     93 }
     94 
     95 Int ML_(readUAS_Int) ( const UChar* data ) {
     96    Int r = 0;
     97    if (host_is_little_endian()) {
     98       r = data[0]
     99           | ( ((UInt)data[1]) << 8 )
    100           | ( ((UInt)data[2]) << 16 )
    101           | ( ((UInt)data[3]) << 24 );
    102    } else {
    103       r = data[3]
    104           | ( ((UInt)data[2]) << 8 )
    105           | ( ((UInt)data[1]) << 16 )
    106           | ( ((UInt)data[0]) << 24 );
    107    }
    108    return r;
    109 }
    110 
    111 Long ML_(readUAS_Long) ( const UChar* data ) {
    112    Long r = 0;
    113    if (host_is_little_endian()) {
    114       r = data[0]
    115           | ( ((ULong)data[1]) << 8 )
    116           | ( ((ULong)data[2]) << 16 )
    117           | ( ((ULong)data[3]) << 24 )
    118           | ( ((ULong)data[4]) << 32 )
    119           | ( ((ULong)data[5]) << 40 )
    120           | ( ((ULong)data[6]) << 48 )
    121           | ( ((ULong)data[7]) << 56 );
    122    } else {
    123       r = data[7]
    124           | ( ((ULong)data[6]) << 8 )
    125           | ( ((ULong)data[5]) << 16 )
    126           | ( ((ULong)data[4]) << 24 )
    127           | ( ((ULong)data[3]) << 32 )
    128           | ( ((ULong)data[2]) << 40 )
    129           | ( ((ULong)data[1]) << 48 )
    130           | ( ((ULong)data[0]) << 56 );
    131    }
    132    return r;
    133 }
    134 
    135 UShort ML_(readUAS_UShort) ( const UChar* data ) {
    136    UInt r = 0;
    137    if (host_is_little_endian()) {
    138       r = data[0]
    139           | ( ((UInt)data[1]) << 8 );
    140    } else {
    141       r = data[1]
    142           | ( ((UInt)data[0]) << 8 );
    143    }
    144    return r;
    145 }
    146 
    147 UChar *ML_(writeUAS_UShort) ( UChar* ptr, UShort val ) {
    148    if (host_is_little_endian()) {
    149       ptr[0] = val & 0xff;
    150       ptr[1] = ( val >> 8 ) & 0xff;
    151    } else {
    152       ptr[0] = ( val >> 8 ) & 0xff;
    153       ptr[1] = val & 0xff;
    154    }
    155    return ptr + sizeof(UShort);
    156 }
    157 
    158 UWord ML_(readUAS_UWord) ( const UChar* data ) {
    159    if (sizeof(UWord) == sizeof(UInt)) {
    160       return ML_(read_UInt)(data);
    161    } else if  (sizeof(UWord) == sizeof(ULong)) {
    162       return ML_(read_ULong)(data);
    163    } else {
    164       vg_assert(0);
    165    }
    166 }
    167 
    168 UInt ML_(readUAS_UInt) ( const UChar* data ) {
    169    UInt r = 0;
    170    if (host_is_little_endian()) {
    171       r = data[0]
    172           | ( ((UInt)data[1]) << 8 )
    173           | ( ((UInt)data[2]) << 16 )
    174           | ( ((UInt)data[3]) << 24 );
    175    } else {
    176       r = data[3]
    177           | ( ((UInt)data[2]) << 8 )
    178           | ( ((UInt)data[1]) << 16 )
    179           | ( ((UInt)data[0]) << 24 );
    180    }
    181    return r;
    182 }
    183 
    184 UChar* ML_(writeUAS_UInt) ( UChar* ptr, UInt val ) {
    185    if (host_is_little_endian()) {
    186       ptr[0] = val & 0xff;
    187       ptr[1] = ( val >> 8 ) & 0xff;
    188       ptr[2] = ( val >> 16 ) & 0xff;
    189       ptr[3] = ( val >> 24 ) & 0xff;
    190    } else {
    191       ptr[0] = ( val >> 24 ) & 0xff;
    192       ptr[1] = ( val >> 16 ) & 0xff;
    193       ptr[2] = ( val >> 8 ) & 0xff;
    194       ptr[3] = val & 0xff;
    195    }
    196    return ptr + sizeof(UInt);
    197 }
    198 
    199 ULong ML_(readUAS_ULong) ( const UChar* data ) {
    200    ULong r = 0;
    201    if (host_is_little_endian()) {
    202       r = data[0]
    203        | ( ((ULong)data[1]) << 8 )
    204        | ( ((ULong)data[2]) << 16 )
    205        | ( ((ULong)data[3]) << 24 )
    206        | ( ((ULong)data[4]) << 32 )
    207        | ( ((ULong)data[5]) << 40 )
    208        | ( ((ULong)data[6]) << 48 )
    209        | ( ((ULong)data[7]) << 56 );
    210    } else {
    211       r = data[7]
    212        | ( ((ULong)data[6]) << 8 )
    213        | ( ((ULong)data[5]) << 16 )
    214        | ( ((ULong)data[4]) << 24 )
    215        | ( ((ULong)data[3]) << 32 )
    216        | ( ((ULong)data[2]) << 40 )
    217        | ( ((ULong)data[1]) << 48 )
    218        | ( ((ULong)data[0]) << 56 );
    219    }
    220    return r;
    221 }
    222 
    223 UChar* ML_(writeUAS_ULong) ( UChar* ptr, ULong val ) {
    224    if (host_is_little_endian()) {
    225       ptr[0] = val & 0xff;
    226       ptr[1] = ( val >> 8 ) & 0xff;
    227       ptr[2] = ( val >> 16 ) & 0xff;
    228       ptr[3] = ( val >> 24 ) & 0xff;
    229       ptr[4] = ( val >> 32 ) & 0xff;
    230       ptr[5] = ( val >> 40 ) & 0xff;
    231       ptr[6] = ( val >> 48 ) & 0xff;
    232       ptr[7] = ( val >> 56 ) & 0xff;
    233    } else {
    234       ptr[0] = ( val >> 56 ) & 0xff;
    235       ptr[1] = ( val >> 48 ) & 0xff;
    236       ptr[2] = ( val >> 40 ) & 0xff;
    237       ptr[3] = ( val >> 32 ) & 0xff;
    238       ptr[4] = ( val >> 24 ) & 0xff;
    239       ptr[5] = ( val >> 16 ) & 0xff;
    240       ptr[6] = ( val >> 8 ) & 0xff;
    241       ptr[7] = val & 0xff;
    242    }
    243    return ptr + sizeof(ULong);
    244 }
    245 
    246 
    247 Addr ML_(readUAS_Addr) ( const UChar* data ) {
    248    if (sizeof(Addr) == sizeof(UInt)) {
    249       return ML_(read_UInt)(data);
    250    } else if  (sizeof(Addr) == sizeof(ULong)) {
    251       return ML_(read_ULong)(data);
    252    } else {
    253       vg_assert(0);
    254    }
    255 }
    256 
    257 UChar* ML_(writeUAS_Addr) ( UChar* ptr, Addr val ) {
    258    if (sizeof(Addr) == sizeof(UInt)) {
    259       return ML_(write_UInt)(ptr, val);
    260    } else if  (sizeof(Addr) == sizeof(ULong)) {
    261       return ML_(write_ULong)(ptr, val);
    262    } else {
    263       vg_assert(0);
    264    }
    265 }
    266 
    267 /*--------------------------------------------------------------------*/
    268 /*--- end                                                   misc.c ---*/
    269 /*--------------------------------------------------------------------*/
    270