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... 17 sub ::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 29 sub ::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 36 sub ::LB 37 { $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'"; 38 $1."l"; 39 } 40 sub ::HB 41 { $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'"; 42 $1."h"; 43 } 44 sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num); } 45 sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num); } 46 sub ::blindpop { &pop($_[0]); $stack+=4; } 47 sub ::wparam { &DWP($stack+4*$_[0],"esp"); } 48 sub ::swtmp { &DWP(4*$_[0],"esp"); } 49 50 sub ::bswap 51 { if ($i386) # emulate bswap for i386 52 { &comment("bswap @_"); 53 &xchg(&HB(@_),&LB(@_)); 54 &ror (@_,16); 55 &xchg(&HB(@_),&LB(@_)); 56 } 57 else 58 { &generic("bswap",@_); } 59 } 60 # These are made-up opcodes introduced over the years essentially 61 # by ignorance, just alias them to real ones... 62 sub ::movb { &mov(@_); } 63 sub ::xorb { &xor(@_); } 64 sub ::rotl { &rol(@_); } 65 sub ::rotr { &ror(@_); } 66 sub ::exch { &xchg(@_); } 67 sub ::halt { &hlt; } 68 sub ::movz { &movzx(@_); } 69 sub ::pushf { &pushfd; } 70 sub ::popf { &popfd; } 71 72 # 3 argument instructions 73 sub ::movq 74 { my($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 87 sub ::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 93 sub ::label # instantiate a function-scope label 94 { if (!defined($label{$_[0]})) 95 { $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++; } 96 $label{$_[0]}; 97 } 98 99 sub ::LABEL # instantiate a file-scope label 100 { $label{$_[0]}=$_[1] if (!defined($label{$_[0]})); 101 $label{$_[0]}; 102 } 103 104 sub ::static_label { &::LABEL($_[0],$lbdecor.$_[0]); } 105 106 sub ::set_label_B { push(@out,"@_:\n"); } 107 sub ::set_label 108 { my $label=&::label($_[0]); 109 &::align($_[1]) if ($_[1]>1); 110 &::set_label_B($label); 111 $label; 112 } 113 114 sub ::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 120 sub ::function_begin 121 { &function_begin_B(@_); 122 $stack=4; 123 &push("ebp"); 124 &push("ebx"); 125 &push("esi"); 126 &push("edi"); 127 } 128 129 sub ::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 } 139 140 sub ::function_end_A 141 { &pop("edi"); 142 &pop("esi"); 143 &pop("ebx"); 144 &pop("ebp"); 145 &ret(); 146 $stack+=16; # readjust esp as if we didn't pop anything 147 } 148 149 sub ::asciz 150 { my @str=unpack("C*",shift); 151 push @str,0; 152 while ($#str>15) { 153 &data_byte(@str[0..15]); 154 foreach (0..15) { shift @str; } 155 } 156 &data_byte(@str) if (@str); 157 } 158 159 sub ::asm_finish 160 { &file_end(); 161 print @out; 162 } 163 164 sub ::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"; 189 Pick 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 196 EOF 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 } 206 207 1; 208
