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|
#!/usr/bin/perl -w
#
# $Id: preasm_proc.pl,v 1.3 2010-01-13 16:22:55 vrsieh Exp $
#
# Copyright (C) 2005-2009 FAUmachine Team <info@faumachine.org>.
# This program is free software. You can redistribute it and/or modify it
# under the terms of the GNU General Public License, either version 2 of
# the License, or (at your option) any later version. See COPYING.
sub check_section_spec
{
my ($section);
my ($line);
($line) = @_;
# ".section" keyword
if ($line =~ /^\s*\.section\b\s*([\.\w]*)/) {
$section = $1;
# ".text" keyword
} elsif ($line =~ /^\s*\.text\s*/) {
$section = ".text";
# ".data" keyword
} elsif ($line =~ /^\s*\.data\s*/) {;
$section = ".data";
# No section specifier
} else {
$section = undef;
}
return $section;
}
sub ext_sym_name
{
my ($in_file);
my ($label);
($in_file, $label) = @_;
my ($return);
$module = $in_file;
$module =~ s/\..*$/\_o/;
$module =~ s/\//_/g;
$module =~ s/\-/_/g;
$return = "${LOC_FUNC_PREFIX}${module}_${label}";
}
sub change_label
{
# SEG_/OFF_ prefix and generated variable from faucc
$_ = $_[0];
if (($_ =~ /.*SEG__.*/ or $_ =~ /.*OFF__.*/) ) {
$varlen = length($_);
$varstart = index($_, _,0) + 1;
$str0 = substr($_, 0, $varstart);
$str1 = substr($_, $varstart, $varlen);
if ($DEBUG) {
print "$str0+$str1\n";
}
$_ = "$str0${LOC_FUNC_PREFIX}${module}_$str1";
}
return $_;
}
$PROGRAM = "preasm_proc.pl";
$GEN_HEAD = "\t/* Generated by $PROGRAM */ \n";
$GEN_TAIL = "\t/* End of $PROGRAM */ \n";
$LOC_FUNC_PREFIX = "__LOCAL_";
$DEBUG = 0;
$in_file = $ARGV[0];
$out_file = $ARGV[1];
$as_input = $ARGV[2];
my %local_labels = ();
open(IN, $in_file)
|| die "$PROGRAM: unable to open input file \"$in_file\" ($!)";
my ($cur_sect);
$cur_sect = ".text";
# First pass: collect necessary data
while (defined($line = <IN>)) {
if ($line =~ /\s*(.*):.*/) {
$local_labels{$1} = "defined";
}
}
# Second pass: process it
seek(IN, 0, 0);
open(OUT, ">$out_file")
|| die "$PROGRAM: unable to open output file \"$out_file\" ($!)";
$code_size = 32;
while (defined($line = <IN>)) {
# Detect 32-bit code
if ($line =~ /\s*\.code32\b\s*/) {
print OUT "/* $PROGRAM: 32-bit code */\n";
$code_size = 32;
} elsif ($line =~ /\s*\.code16(|gcc)\b\s*/) {
if ($code_size eq 32) {
$code_size = 16;
print OUT "/* $PROGRAM: End of 32-bit code */\n";
}
}
if ($line =~ /\s*ex_lcall\b\s*\b([\w\.]*)(;|\s)*.*/) {
$tar_label = $1;
$tar_type = undef;
if (grep($tar_label eq $_, keys %local_labels)) {
$tar_ref = ext_sym_name($in_file, $tar_label);
$tar_type= "local";
} else {
$tar_ref = $tar_label;
$tar_type = "external";
}
if ($DEBUG) {
print OUT $GEN_HEAD;
print OUT "\t/* call to $tar_type label $tar_label ($tar_ref) */ \n";
}
print OUT "\t.byte 0x9a \n";
print OUT "\t.word OFF_$tar_ref, SEG_$tar_ref\n";
if ($DEBUG) {
print OUT $GEN_TAIL;
}
}elsif ($line =~ /\s*ex_ljmp\b\s*\b([\w\.]*)(;|\s)*.*/) {
$tar_label = $1;
$tar_type = undef;
$tar_ref = undef;
if (grep($tar_label eq $_, keys %local_labels)) {
$tar_type = "local (diff. section)";
$tar_ref = ext_sym_name($in_file, $tar_label);
} else {
$tar_ref = $tar_label;
$tar_type = "external";
}
if ($DEBUG) {
print OUT $GEN_HEAD;
print OUT "\t/* jump to ${tar_type} label ${tar_label} ref: $tar_label */ \n";
}
print OUT "\t.byte 0xea \n";
print OUT "\t.word OFF_$tar_ref, SEG_$tar_ref \n";
if ($DEBUG) {
print OUT $GEN_TAIL;
}
} elsif ($line =~ /^\s*([a-zA-Z_\.][\.\w]*):.*$/) {
$label = $1;
if ($as_input == 0) {
if ($line =~ /^\s*([a-zA-Z\.][\.\w]*):.*$/) {
$nline = substr($line, 0, length($line)-2);
print OUT "\t.globl $nline\n";
}
}
print OUT $line;
if ($DEBUG) {
print OUT $GEN_HEAD, "\t/* export all labels */ \n";
}
$new_sym_name = ext_sym_name($in_file, $label);
print OUT "\t.globl $new_sym_name \n";
print OUT "$new_sym_name: \n";
} else {
if ($as_input == 0) {
$line = change_label($line);
}
print OUT "$line\n";
}
}
close(IN)
|| die "$PROGRAM: unable to close input file \"$in_file\" ($!)";
close(OUT)
|| die "$PROGRAM: unable to close output file \"$out_file\" ($!)";
|
