trampoline.sh

   1 #!/usr/bin/env bash
   2
   3 # Cycript - Optimizing JavaScript Compiler/Runtime
   4 # Copyright (C) 2009-2013  Jay Freeman (saurik)
   5
   6 # GNU General Public License, Version 3 {{{
   7 #
   8 # Cycript is free software: you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published
  10 # by the Free Software Foundation, either version 3 of the License,
  11 # or (at your option) any later version.
  12 #
  13 # Cycript is distributed in the hope that it will be useful, but
  14 # WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with Cycript.  If not, see <http://www.gnu.org/licenses/>.
  20 # }}}
  21
  22 set -e
  23
  24 hpp=$1
  25 object=$2
  26 name=$3
  27 sed=$4
  28 lipo=$5
  29 nm=$6
  30 otool=$7
  31
  32 exec >"${hpp}"
  33
  34 detailed=$("${lipo}" -detailed_info "${object}")
  35
  36 regex=$'\nNon-fat file: .* is architecture: (.*)'
  37 if [[ ${detailed} =~ ${regex} ]]; then
  38     archs=(${BASH_REMATCH[1]})
  39     unset detailed
  40 else
  41     archs=($(echo "${detailed}" | "${sed}" -e '/^architecture / { s/^architecture //; p; }; d;'))
  42 fi
  43
  44 echo '#include "Trampoline.hpp"'
  45
  46 for arch in "${archs[@]}"; do
  47     if [[ "${detailed+@}" ]]; then
  48         offset=$(echo "${detailed}" | "${sed}" -e '
  49             /^architecture / { x; s/.*/0/; x; };
  50             /^architecture '${arch}'$/ { x; s/.*/1/; x; };
  51             x; /^1$/ { x; /^ *offset / { s/^ *offset //; p; }; x; }; x;
  52             d;
  53         ')
  54     else
  55         offset=0
  56     fi
  57
  58     file=($("${otool}" -arch "${arch}" -l "${object}" | "${sed}" -e '
  59         x; /^1$/ { x;
  60             /^ *fileoff / { s/^.* //; p; };
  61             /^ *filesize / { s/^.* //; p; };
  62         x; }; x;
  63
  64         /^ *cmd LC_SEGMENT/ { x; s/.*/1/; x; };
  65
  66         d;
  67     '))
  68
  69     fileoff=${file[0]}
  70     filesize=${file[1]}
  71
  72     echo
  73     echo "static const char ${name}_${arch}_data_[] = {"
  74
  75     LANG=C od -v -t x1 -t c -j "$((offset + fileoff))" -N "${filesize}" "${object}" | "${sed}" -e '
  76         /^[0-7]/ ! {
  77             s@^        @//  @;
  78             s/\(....\)/ \1/g;
  79             s@^ // @//@;
  80             s/ *$/,/;
  81         };
  82
  83         /^[0-7]/ {
  84             s/^[^ ]*//;
  85             s/  */ /g;
  86             s/^ *//;
  87             s/ $//;
  88             s/ /,/g;
  89             s/\([^,][^,]\)/0x\1/g;
  90             s/$/,/;
  91             /^,$/ ! { s/^/    /g; p; }; d;
  92         };
  93     '
  94
  95     echo "};"
  96
  97     echo
  98     entry=$("${nm}" -arch "${arch}" "${object}" | "${sed}" -e '/ _Start$/ { s/ .*//; p; }; d;')
  99     entry=${entry##*(0)}
 100     echo "static size_t ${name}_${arch}_entry_ = 0x${entry:=0};"
 101
 102     echo
 103     echo "/*"
 104     "${otool}" -arch "${arch}" -vVt "${object}"
 105     echo "*/"
 106
 107     echo
 108     echo "_disused static Trampoline ${name}_${arch}_ = {"
 109     echo "    ${name}_${arch}_data_,"
 110     echo "    sizeof(${name}_${arch}_data_),"
 111     echo "    ${name}_${arch}_entry_,"
 112     echo "};"
 113
 114 done