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 # SPDX-License-Identifier: BSD-2-Clause-Patent
  11 #
  12 ###
  13
  14 set -e -u
  15
  16 STEM=$(dirname -- "$0")/$(basename -- "$0" .sh)
  17
  18 #
  19 # Install exit handler -- remove temporary files.
  20 #
  21 exit_handler()
  22 {
  23   rm -f -- "$STEM".bin "$STEM".disasm "$STEM".offsets "$STEM".insns \
  24       "$STEM".bytes
  25 }
  26 trap exit_handler EXIT
  27
  28 #
  29 # Assemble the source file.
  30 # (nasm doesn't recognize the "--" end-of-options delimiter;
  31 # <https://bugzilla.nasm.us/show_bug.cgi?id=3392829>.)
  32 #
  33 nasm -o "$STEM".bin "$STEM".asm
  34
  35 #
  36 # Disassemble it, in order to get a binary dump associated with the source.
  37 # (ndisasm doesn't recognize the "--" end-of-options delimiter;
  38 # <https://bugzilla.nasm.us/show_bug.cgi?id=3392829>.)
  39 #
  40 ndisasm "$STEM".bin >"$STEM".disasm
  41
  42 #
  43 # Create three files, each with one column of the disassembly.
  44 #
  45 # The first column contains the offsets, and it starts the comment.
  46 #
  47 cut -c 1-8 -- "$STEM".disasm \
  48 | sed -e 's,^,  /* ,' >"$STEM".offsets
  49
  50 #
  51 # The second column contains the assembly-language instructions, and it closes
  52 # the comment. We first pad it to 30 characters.
  53 #
  54 cut -c 29- -- "$STEM".disasm \
  55 | sed -e 's,$,                              ,' \
  56       -e 's,^\(.\{30\}\).*$,\1 */,' >"$STEM".insns
  57
  58 #
  59 # The third column contains the bytes corresponding to the instruction,
  60 # represented as C integer constants. First strip trailing whitespace from the
  61 # middle column of the input disassembly, then process pairs of nibbles.
  62 #
  63 cut -c 11-28 -- "$STEM".disasm \
  64 | sed -e 's, \+$,,' -e 's/\(..\)/ 0x\1,/g' >"$STEM".bytes
  65
  66 #
  67 # Write the output file, recombining the columns. The output should have CRLF
  68 # line endings.
  69 #
  70 {
  71   printf '//\n'
  72   printf '// THIS FILE WAS GENERATED BY "%s". DO NOT EDIT.\n' \
  73       "$(basename -- "$0")"
  74   printf '//\n'
  75   printf '#ifndef _VBE_SHIM_H_\n'
  76   printf '#define _VBE_SHIM_H_\n'
  77   printf 'STATIC CONST UINT8 mVbeShim[] = {\n'
  78   paste -d ' ' -- "$STEM".offsets "$STEM".insns "$STEM".bytes
  79   printf '};\n'
  80   printf '#endif\n'
  81 } \
  82 | unix2dos >"$STEM".h