LCOV - code coverage report
Current view: top level - libelf - gelf_xlate.c (source / functions) Hit Total Coverage
Test: elfutils-0.181 Lines: 4 4 100.0 %
Date: 2020-09-08 14:07:57 Functions: 1 1 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* Transformation functions for ELF data types.
       2             :    Copyright (C) 1998,1999,2000,2002,2004,2005,2006,2007,2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 1998.
       5             : 
       6             :    This file is free software; you can redistribute it and/or modify
       7             :    it under the terms of either
       8             : 
       9             :      * the GNU Lesser General Public License as published by the Free
      10             :        Software Foundation; either version 3 of the License, or (at
      11             :        your option) any later version
      12             : 
      13             :    or
      14             : 
      15             :      * the GNU General Public License as published by the Free
      16             :        Software Foundation; either version 2 of the License, or (at
      17             :        your option) any later version
      18             : 
      19             :    or both in parallel, as here.
      20             : 
      21             :    elfutils is distributed in the hope that it will be useful, but
      22             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24             :    General Public License for more details.
      25             : 
      26             :    You should have received copies of the GNU General Public License and
      27             :    the GNU Lesser General Public License along with this program.  If
      28             :    not, see <http://www.gnu.org/licenses/>.  */
      29             : 
      30             : #ifdef HAVE_CONFIG_H
      31             : # include <config.h>
      32             : #endif
      33             : 
      34             : #include <byteswap.h>
      35             : #include <stdint.h>
      36             : #include <string.h>
      37             : #include <stdlib.h>
      38             : 
      39             : #include "libelfP.h"
      40             : 
      41             : #ifndef LIBELFBITS
      42             : # define LIBELFBITS     32
      43             : #endif
      44             : 
      45             : 
      46             : /* Well, what shall I say.  Nothing to do here.  */
      47             : #define elf_cvt_Byte(dest, src, n) \
      48             :   (__builtin_constant_p (n) && (n) == 1                                       \
      49             :    ? (void) (*((char *) (dest)) = *((char *) (src)))                          \
      50             :    : Elf32_cvt_Byte (dest, src, n))
      51             : static void
      52      788157 : (elf_cvt_Byte) (void *dest, const void *src, size_t n,
      53             :                 int encode __attribute__ ((unused)))
      54             : {
      55      788157 :   if (n != 0)
      56      788056 :     memmove (dest, src, n);
      57      788157 : }
      58             : 
      59             : 
      60             : /* We'll optimize the definition of the conversion functions here a
      61             :    bit.  We need only functions for 16, 32, and 64 bits.  The
      62             :    functions referenced in the table will be aliases for one of these
      63             :    functions.  Which one is decided by the ELFxx_FSZ_type.  */
      64             : 
      65             : #if ALLOW_UNALIGNED
      66             : 
      67             : #define FETCH(Bits, ptr)        (*(const uint##Bits##_t *) ptr)
      68             : #define STORE(Bits, ptr, val)   (*(uint##Bits##_t *) ptr = val)
      69             : 
      70             : #else
      71             : 
      72             : union unaligned
      73             :   {
      74             :     uint16_t u16;
      75             :     uint32_t u32;
      76             :     uint64_t u64;
      77             :   } attribute_packed;
      78             : 
      79             : #define FETCH(Bits, ptr)        (((const union unaligned *) ptr)->u##Bits)
      80             : #define STORE(Bits, ptr, val)   (((union unaligned *) ptr)->u##Bits = val)
      81             : 
      82             : #endif
      83             : 
      84             : /* Now define the conversion functions for the basic types.  We use here
      85             :    the fact that file and memory types are the same and that we have the
      86             :    ELFxx_FSZ_* macros.
      87             : 
      88             :    At the same time we define inline functions which we will use to
      89             :    convert the complex types.  */
      90             : #define FUNDAMENTAL(NAME, Name, Bits) \
      91             :   INLINE2 (ELFW2(Bits,FSZ_##NAME), ElfW2(Bits,cvt_##Name), ElfW2(Bits,Name))
      92             : #define INLINE2(Bytes, FName, TName) \
      93             :   INLINE3 (Bytes, FName, TName)
      94             : #define INLINE3(Bytes, FName, TName)                                          \
      95             :   static inline void FName##1 (void *dest, const void *ptr)                   \
      96             :   {                                                                           \
      97             :     switch (Bytes)                                                            \
      98             :       {                                                                       \
      99             :       case 2: STORE (16, dest, bswap_16 (FETCH (16, ptr))); break;            \
     100             :       case 4: STORE (32, dest, bswap_32 (FETCH (32, ptr))); break;            \
     101             :       case 8: STORE (64, dest, bswap_64 (FETCH (64, ptr))); break;            \
     102             :       default:                                                                \
     103             :         abort ();                                                             \
     104             :       }                                                                       \
     105             :   }                                                                           \
     106             :                                                                               \
     107             :   static void FName (void *dest, const void *ptr, size_t len,                 \
     108             :                      int encode __attribute__ ((unused)))                     \
     109             :   {                                                                           \
     110             :     size_t n = len / sizeof (TName);                                          \
     111             :     if (dest < ptr)                                                        \
     112             :       while (n-- > 0)                                                              \
     113             :         {                                                                     \
     114             :           FName##1 (dest, ptr);                                               \
     115             :           dest += Bytes;                                                      \
     116             :           ptr += Bytes;                                                       \
     117             :         }                                                                     \
     118             :     else                                                                      \
     119             :       {                                                                       \
     120             :         dest += len;                                                          \
     121             :         ptr += len;                                                           \
     122             :         while (n-- > 0)                                                            \
     123             :           {                                                                   \
     124             :             ptr -= Bytes;                                                     \
     125             :             dest -= Bytes;                                                    \
     126             :             FName##1 (dest, ptr);                                             \
     127             :           }                                                                   \
     128             :       }                                                                       \
     129             :   }
     130             : 
     131             : 
     132             : /* Now the tricky part: define the transformation functions for the
     133             :    complex types.  We will use the definitions of the types in
     134             :    abstract.h.  */
     135             : #define START(Bits, Name, EName) \
     136             :   static void                                                                 \
     137             :   ElfW2 (Bits, cvt_##Name) (void *dest, const void *src, size_t len,          \
     138             :                             int encode __attribute__ ((unused)))              \
     139             :   { ElfW2(Bits, Name) *tdest = (ElfW2(Bits, Name) *) dest;                    \
     140             :     ElfW2(Bits, Name) *tsrc = (ElfW2(Bits, Name) *) src;                      \
     141             :     size_t n;                                                                 \
     142             :     for (n = len / sizeof (ElfW2(Bits, Name)); n > 0; ++tdest, ++tsrc, --n) {
     143             : #define END(Bits, Name) } }
     144             : #define TYPE_EXTRA(Code)
     145             : #define TYPE_XLATE(Code) Code
     146             : #define TYPE_NAME(Type, Name) TYPE_NAME2 (Type, Name)
     147             : #define TYPE_NAME2(Type, Name) Type##1 (&tdest->Name, &tsrc->Name);
     148             : #define TYPE(Name, Bits) TYPE2 (Name, Bits)
     149             : #define TYPE2(Name, Bits) TYPE3 (Name##Bits)
     150             : #define TYPE3(Name) Name (cvt_)
     151             : 
     152             : /* Signal that we are generating conversion functions.  */
     153             : #define GENERATE_CONVERSION
     154             : 
     155             : /* First generate the 32-bit conversion functions.  */
     156             : #define LIBELFBITS 32
     157             : #include "gelf_xlate.h"
     158             : 
     159             : /* Now generate the 64-bit conversion functions.  */
     160             : #define LIBELFBITS 64
     161             : #include "gelf_xlate.h"
     162             : 
     163             : 
     164             : /* We have a few functions which we must create by hand since the sections
     165             :    do not contain records of only one type.  */
     166             : #include "version_xlate.h"
     167             : #include "gnuhash_xlate.h"
     168             : #include "note_xlate.h"
     169             : #include "chdr_xlate.h"
     170             : 
     171             : 
     172             : /* Now the externally visible table with the function pointers.  */
     173             : const xfct_t __elf_xfctstom[ELFCLASSNUM - 1][ELF_T_NUM] =
     174             : {
     175             :       [ELFCLASS32 - 1] = {
     176             : #define define_xfcts(Bits) \
     177             :         [ELF_T_BYTE]    = elf_cvt_Byte,                                       \
     178             :         [ELF_T_ADDR]    = ElfW2(Bits, cvt_Addr),                              \
     179             :         [ELF_T_DYN]     = ElfW2(Bits, cvt_Dyn),                               \
     180             :         [ELF_T_EHDR]    = ElfW2(Bits, cvt_Ehdr),                              \
     181             :         [ELF_T_HALF]    = ElfW2(Bits, cvt_Half),                              \
     182             :         [ELF_T_OFF]     = ElfW2(Bits, cvt_Off),                               \
     183             :         [ELF_T_PHDR]    = ElfW2(Bits, cvt_Phdr),                              \
     184             :         [ELF_T_RELA]    = ElfW2(Bits, cvt_Rela),                              \
     185             :         [ELF_T_REL]     = ElfW2(Bits, cvt_Rel),                               \
     186             :         [ELF_T_SHDR]    = ElfW2(Bits, cvt_Shdr),                              \
     187             :         [ELF_T_SWORD]   = ElfW2(Bits, cvt_Sword),                             \
     188             :         [ELF_T_SYM]     = ElfW2(Bits, cvt_Sym),                               \
     189             :         [ELF_T_WORD]    = ElfW2(Bits, cvt_Word),                              \
     190             :         [ELF_T_XWORD]   = ElfW2(Bits, cvt_Xword),                             \
     191             :         [ELF_T_SXWORD]  = ElfW2(Bits, cvt_Sxword),                            \
     192             :         [ELF_T_VDEF]    = elf_cvt_Verdef,                                     \
     193             :         [ELF_T_VDAUX]   = elf_cvt_Verdef,                                     \
     194             :         [ELF_T_VNEED]   = elf_cvt_Verneed,                                    \
     195             :         [ELF_T_VNAUX]   = elf_cvt_Verneed,                                    \
     196             :         [ELF_T_NHDR]    = elf_cvt_note4,                                      \
     197             :         [ELF_T_NHDR8]   = elf_cvt_note8,                                      \
     198             :         [ELF_T_SYMINFO] = ElfW2(Bits, cvt_Syminfo),                           \
     199             :         [ELF_T_MOVE]    = ElfW2(Bits, cvt_Move),                              \
     200             :         [ELF_T_LIB]     = ElfW2(Bits, cvt_Lib),                               \
     201             :         [ELF_T_AUXV]    = ElfW2(Bits, cvt_auxv_t),                            \
     202             :         [ELF_T_CHDR]    = ElfW2(Bits, cvt_chdr)
     203             :         define_xfcts (32),
     204             :         [ELF_T_GNUHASH] = Elf32_cvt_Word
     205             :       },
     206             :       [ELFCLASS64 - 1] = {
     207             :         define_xfcts (64),
     208             :         [ELF_T_GNUHASH] = elf_cvt_gnuhash
     209             :       }
     210             : };

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