#!/bin/sh | |
### | |
# @file | |
# Shell script to assemble and dump the fake Int10h handler from NASM source to | |
# a C array. | |
# | |
# Copyright (C) 2020, Rebecca Cran <rebecca@bsdio.com> | |
# Copyright (C) 2014, Red Hat, Inc. | |
# Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.<BR> | |
# | |
# SPDX-License-Identifier: BSD-2-Clause-Patent | |
# | |
### | |
set -e -u | |
STEM=$(dirname -- "$0")/$(basename -- "$0" .sh) | |
# | |
# Install exit handler -- remove temporary files. | |
# | |
exit_handler() | |
{ | |
rm -f -- "$STEM".bin "$STEM".disasm "$STEM".offsets "$STEM".insns \ | |
"$STEM".bytes | |
} | |
trap exit_handler EXIT | |
# | |
# Assemble the source file. | |
# | |
nasm -o "$STEM".bin -- "$STEM".asm | |
# | |
# Disassemble it, in order to get a binary dump associated with the source. | |
# (ndisasm doesn't recognize the "--" end-of-options delimiter.) | |
# | |
ndisasm "$STEM".bin >"$STEM".disasm | |
# | |
# Create three files, each with one column of the disassembly. | |
# | |
# The first column contains the offsets, and it starts the comment. | |
# | |
cut -c 1-8 -- "$STEM".disasm \ | |
| sed -e 's,^, /* ,' >"$STEM".offsets | |
# | |
# The second column contains the assembly-language instructions, and it closes | |
# the comment. We first pad it to 30 characters. | |
# | |
cut -c 29- -- "$STEM".disasm \ | |
| sed -e 's,$, ,' \ | |
-e 's,^\(.\{30\}\).*$,\1 */,' >"$STEM".insns | |
# | |
# The third column contains the bytes corresponding to the instruction, | |
# represented as C integer constants. First strip trailing whitespace from the | |
# middle column of the input disassembly, then process pairs of nibbles. | |
# | |
cut -c 11-28 -- "$STEM".disasm \ | |
| sed -e 's, \+$,,' -e 's/\(..\)/ 0x\1,/g' | sed 's/0x ,//g' >"$STEM".bytes | |
# | |
# Write the output file, recombining the columns. The output should have CRLF | |
# line endings. | |
# | |
{ | |
printf '//\n' | |
printf '// THIS FILE WAS GENERATED BY "%s". DO NOT EDIT.\n' \ | |
"$(basename -- "$0")" | |
printf '//\n' | |
printf '#ifndef _VBE_SHIM_H_\n' | |
printf '#define _VBE_SHIM_H_\n' | |
printf 'STATIC CONST UINT8 mVbeShim[] = {\n' | |
paste -d ' ' -- "$STEM".offsets "$STEM".insns "$STEM".bytes | |
printf '};\n' | |
printf '#endif\n' | |
} \ | |
| unix2dos >"$STEM".h |