1#!/usr/bin/env perl 2 3# require 'x86asm.pl'; 4# &asm_init(<flavor>,"des-586.pl"[,$i386only]); 5# &function_begin("foo"); 6# ... 7# &function_end("foo"); 8# &asm_finish 9 10$out=(); 11$i386=0; 12 13# AUTOLOAD is this context has quite unpleasant side effect, namely 14# that typos in function calls effectively go to assembler output, 15# but on the pros side we don't have to implement one subroutine per 16# each opcode... 17sub ::AUTOLOAD 18{ my $opcode = $AUTOLOAD; 19 20 die "more than 4 arguments passed to $opcode" if ($#_>3); 21 22 $opcode =~ s/.*:://; 23 if ($opcode =~ /^push/) { $stack+=4; } 24 elsif ($opcode =~ /^pop/) { $stack-=4; } 25 26 &generic($opcode,@_) or die "undefined subroutine \&$AUTOLOAD"; 27} 28 29sub ::emit 30{ my $opcode=shift; 31 32 if ($#_==-1) { push(@out,"\t$opcode\n"); } 33 else { push(@out,"\t$opcode\t".join(',',@_)."\n"); } 34} 35 36sub ::LB 37{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'"; 38 $1."l"; 39} 40sub ::HB 41{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'"; 42 $1."h"; 43} 44sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num); } 45sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num); } 46sub ::blindpop { &pop($_[0]); $stack+=4; } 47sub ::wparam { &DWP($stack+4*$_[0],"esp"); } 48sub ::swtmp { &DWP(4*$_[0],"esp"); } 49 50sub ::bswap 51{ if ($i386) # emulate bswap for i386 52 { &comment("bswap @_"); 53 &xchg(&HB(@_),&LB(@_)); 54 &ror (@_,16); 55 &xchg(&HB(@_),&LB(@_)); 56 } 57 else 58 { &generic("bswap",@_); } 59} 60# These are made-up opcodes introduced over the years essentially 61# by ignorance, just alias them to real ones... 62sub ::movb { &mov(@_); } 63sub ::xorb { &xor(@_); } 64sub ::rotl { &rol(@_); } 65sub ::rotr { &ror(@_); } 66sub ::exch { &xchg(@_); } 67sub ::halt { &hlt; } 68sub ::movz { &movzx(@_); } 69sub ::pushf { &pushfd; } 70sub ::popf { &popfd; } 71 72# 3 argument instructions 73sub ::movq 74{ my($p1,$p2,$optimize)=@_; 75 76 if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/) 77 # movq between mmx registers can sink Intel CPUs 78 { &::pshufw($p1,$p2,0xe4); } 79 else 80 { &::generic("movq",@_); } 81} 82 83# label management 84$lbdecor="L"; # local label decoration, set by package 85$label="000"; 86 87sub ::islabel # see is argument is a known label 88{ my $i; 89 foreach $i (values %label) { return $i if ($i eq $_[0]); } 90 $label{$_[0]}; # can be undef 91} 92 93sub ::label # instantiate a function-scope label 94{ if (!defined($label{$_[0]})) 95 { $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++; } 96 $label{$_[0]}; 97} 98 99sub ::LABEL # instantiate a file-scope label 100{ $label{$_[0]}=$_[1] if (!defined($label{$_[0]})); 101 $label{$_[0]}; 102} 103 104sub ::static_label { &::LABEL($_[0],$lbdecor.$_[0]); } 105 106sub ::set_label_B { push(@out,"@_:\n"); } 107sub ::set_label 108{ my $label=&::label($_[0]); 109 &::align($_[1]) if ($_[1]>1); 110 &::set_label_B($label); 111 $label; 112} 113 114sub ::wipe_labels # wipes function-scope labels 115{ foreach $i (keys %label) 116 { delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/); } 117} 118 119# subroutine management 120sub ::function_begin 121{ &function_begin_B(@_); 122 $stack=4; 123 &push("ebp"); 124 &push("ebx"); 125 &push("esi"); 126 &push("edi"); 127} 128 129sub ::function_end 130{ &pop("edi"); 131 &pop("esi"); 132 &pop("ebx"); 133 &pop("ebp"); 134 &ret(); 135 &function_end_B(@_); 136 $stack=0; 137 &wipe_labels(); 138} 139 140sub ::function_end_A 141{ &pop("edi"); 142 &pop("esi"); 143 &pop("ebx"); 144 &pop("ebp"); 145 &ret(); 146 $stack+=16; # readjust esp as if we didn't pop anything 147} 148 149sub ::asciz 150{ my @str=unpack("C*",shift); 151 push @str,0; 152 while ($#str>15) { 153 &data_byte(@str[0..15]); 154 foreach (0..15) { shift @str; } 155 } 156 &data_byte(@str) if (@str); 157} 158 159sub ::asm_finish 160{ &file_end(); 161 print @out; 162} 163 164sub ::asm_init 165{ my ($type,$fn,$cpu)=@_; 166 167 $filename=$fn; 168 $i386=$cpu; 169 170 $elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=0; 171 if (($type eq "elf")) 172 { $elf=1; require "x86gas.pl"; } 173 elsif (($type eq "a\.out")) 174 { $aout=1; require "x86gas.pl"; } 175 elsif (($type eq "coff" or $type eq "gaswin")) 176 { $coff=1; require "x86gas.pl"; } 177 elsif (($type eq "win32n")) 178 { $win32=1; require "x86nasm.pl"; } 179 elsif (($type eq "nw-nasm")) 180 { $netware=1; require "x86nasm.pl"; } 181 #elsif (($type eq "nw-mwasm")) 182 #{ $netware=1; $mwerks=1; require "x86nasm.pl"; } 183 elsif (($type eq "win32")) 184 { $win32=1; require "x86masm.pl"; } 185 elsif (($type eq "macosx")) 186 { $aout=1; $macosx=1; require "x86gas.pl"; } 187 else 188 { print STDERR <<"EOF"; 189Pick one target type from 190 elf - Linux, FreeBSD, Solaris x86, etc. 191 a.out - DJGPP, elder OpenBSD, etc. 192 coff - GAS/COFF such as Win32 targets 193 win32n - Windows 95/Windows NT NASM format 194 nw-nasm - NetWare NASM format 195 macosx - Mac OS X 196EOF 197 exit(1); 198 } 199 200 $pic=0; 201 for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); } 202 203 $filename =~ s/\.pl$//; 204 &file($filename); 205} 206 2071; 208