OvmfPkg/QemuVideoDxe/VbeShim.sh

   1 #!/bin/sh
   2 ###
   3 # @file
   4 # Shell script to assemble and dump the fake Int10h handler from NASM source to
   5 # a C array.
   6 #
   7 # Copyright (C) 2014, Red Hat, Inc.
   8 # Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.<BR>
   9 #
  10 # This program and the accompanying materials are licensed and made available
  11 # under the terms and conditions of the BSD License which accompanies this
  12 # distribution.  The full text of the license may be found at
  13 # http://opensource.org/licenses/bsd-license.php
  14 #
  15 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  16 # WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  17 #
  18 ###
  19
  20 set -e -u
  21
  22 STEM=$(dirname -- "$0")/$(basename -- "$0" .sh)
  23
  24 #
  25 # Install exit handler -- remove temporary files.
  26 #
  27 exit_handler()
  28 {
  29   rm -f -- "$STEM".bin "$STEM".disasm "$STEM".offsets "$STEM".insns \
  30       "$STEM".bytes
  31 }
  32 trap exit_handler EXIT
  33
  34 #
  35 # Assemble the source file.
  36 #
  37 nasm -o "$STEM".bin -- "$STEM".asm
  38
  39 #
  40 # Disassemble it, in order to get a binary dump associated with the source.
  41 # (ndisasm doesn't recognize the "--" end-of-options delimiter.)
  42 #
  43 ndisasm "$STEM".bin >"$STEM".disasm
  44
  45 #
  46 # Create three files, each with one column of the disassembly.
  47 #
  48 # The first column contains the offsets, and it starts the comment.
  49 #
  50 cut -c 1-8 -- "$STEM".disasm \
  51 | sed -e 's,^,  /* ,' >"$STEM".offsets
  52
  53 #
  54 # The second column contains the assembly-language instructions, and it closes
  55 # the comment. We first pad it to 30 characters.
  56 #
  57 cut -c 29- -- "$STEM".disasm \
  58 | sed -e 's,$,                              ,' \
  59       -e 's,^\(.\{30\}\).*$,\1 */,' >"$STEM".insns
  60
  61 #
  62 # The third column contains the bytes corresponding to the instruction,
  63 # represented as C integer constants. First strip trailing whitespace from the
  64 # middle column of the input disassembly, then process pairs of nibbles.
  65 #
  66 cut -c 11-28 -- "$STEM".disasm \
  67 | sed -e 's, \+$,,' -e 's/\(..\)/ 0x\1,/g' >"$STEM".bytes
  68
  69 #
  70 # Write the output file, recombining the columns. The output should have CRLF
  71 # line endings.
  72 #
  73 {
  74   printf '//\n'
  75   printf '// THIS FILE WAS GENERATED BY "%s". DO NOT EDIT.\n' \
  76       "$(basename -- "$0")"
  77   printf '//\n'
  78   printf '#ifndef _VBE_SHIM_H_\n'
  79   printf '#define _VBE_SHIM_H_\n'
  80   printf 'STATIC CONST UINT8 mVbeShim[] = {\n'
  81   paste -d ' ' -- "$STEM".offsets "$STEM".insns "$STEM".bytes
  82   printf '};\n'
  83   printf '#endif\n'
  84 } \
  85 | unix2dos >"$STEM".h