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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