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 ::emitraw 37{ my $opcode=shift; 38 39 if ($#_==-1) { push(@out,"$opcode\n"); } 40 else { push(@out,"$opcode\t".join(',',@_)."\n"); } 41} 42 43sub ::LB 44{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'"; 45 $1."l"; 46} 47sub ::HB 48{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'"; 49 $1."h"; 50} 51sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num); } 52sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num); } 53sub ::blindpop { &pop($_[0]); $stack+=4; } 54sub ::wparam { &DWP($stack+4*$_[0],"esp"); } 55sub ::swtmp { &DWP(4*$_[0],"esp"); } 56 57sub ::bswap 58{ if ($i386) # emulate bswap for i386 59 { &comment("bswap @_"); 60 &xchg(&HB(@_),&LB(@_)); 61 &ror (@_,16); 62 &xchg(&HB(@_),&LB(@_)); 63 } 64 else 65 { &generic("bswap",@_); } 66} 67# These are made-up opcodes introduced over the years essentially 68# by ignorance, just alias them to real ones... 69sub ::movb { &mov(@_); } 70sub ::xorb { &xor(@_); } 71sub ::rotl { &rol(@_); } 72sub ::rotr { &ror(@_); } 73sub ::exch { &xchg(@_); } 74sub ::halt { &hlt; } 75sub ::movz { &movzx(@_); } 76sub ::pushf { &pushfd; } 77sub ::popf { &popfd; } 78 79# 3 argument instructions 80sub ::movq 81{ my($p1,$p2,$optimize)=@_; 82 83 if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/) 84 # movq between mmx registers can sink Intel CPUs 85 { &::pshufw($p1,$p2,0xe4); } 86 else 87 { &::generic("movq",@_); } 88} 89 90# label management 91$lbdecor="L"; # local label decoration, set by package 92$label="000"; 93 94sub ::islabel # see is argument is a known label 95{ my $i; 96 foreach $i (values %label) { return $i if ($i eq $_[0]); } 97 $label{$_[0]}; # can be undef 98} 99 100sub ::label # instantiate a function-scope label 101{ if (!defined($label{$_[0]})) 102 { $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++; } 103 $label{$_[0]}; 104} 105 106sub ::LABEL # instantiate a file-scope label 107{ $label{$_[0]}=$_[1] if (!defined($label{$_[0]})); 108 $label{$_[0]}; 109} 110 111sub ::static_label { &::LABEL($_[0],$lbdecor.$_[0]); } 112 113sub ::set_label_B { push(@out,"@_:\n"); } 114sub ::set_label 115{ my $label=&::label($_[0]); 116 &::align($_[1]) if ($_[1]>1); 117 &::set_label_B($label); 118 $label; 119} 120 121sub ::wipe_labels # wipes function-scope labels 122{ foreach $i (keys %label) 123 { delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/); } 124} 125 126# subroutine management 127sub ::function_begin 128{ &function_begin_B(@_); 129 $stack=4; 130 &push("ebp"); 131 &push("ebx"); 132 &push("esi"); 133 &push("edi"); 134} 135 136sub ::function_end 137{ &pop("edi"); 138 &pop("esi"); 139 &pop("ebx"); 140 &pop("ebp"); 141 &ret(); 142 &function_end_B(@_); 143 $stack=0; 144 &wipe_labels(); 145} 146 147sub ::function_end_A 148{ &pop("edi"); 149 &pop("esi"); 150 &pop("ebx"); 151 &pop("ebp"); 152 &ret(); 153 $stack+=16; # readjust esp as if we didn't pop anything 154} 155 156sub ::asciz 157{ my @str=unpack("C*",shift); 158 push @str,0; 159 while ($#str>15) { 160 &data_byte(@str[0..15]); 161 foreach (0..15) { shift @str; } 162 } 163 &data_byte(@str) if (@str); 164} 165 166sub ::asm_finish 167{ &file_end(); 168 print @out; 169} 170 171sub ::asm_init 172{ my ($type,$fn,$cpu)=@_; 173 174 $filename=$fn; 175 $i386=$cpu; 176 177 $elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=$openbsd=0; 178 if (($type eq "elf")) 179 { $elf=1; require "x86gas.pl"; } 180 elsif (($type eq "a\.out")) 181 { $aout=1; require "x86gas.pl"; } 182 elsif (($type eq "coff" or $type eq "gaswin")) 183 { $coff=1; require "x86gas.pl"; } 184 elsif (($type eq "win32n")) 185 { $win32=1; require "x86nasm.pl"; } 186 elsif (($type eq "nw-nasm")) 187 { $netware=1; require "x86nasm.pl"; } 188 #elsif (($type eq "nw-mwasm")) 189 #{ $netware=1; $mwerks=1; require "x86nasm.pl"; } 190 elsif (($type eq "win32")) 191 { $win32=1; require "x86masm.pl"; } 192 elsif (($type eq "macosx")) 193 { $aout=1; $macosx=1; require "x86gas.pl"; } 194 elsif (($type eq "openbsd-elf")) 195 { $openbsd=$elf=1; require "x86gas.pl"; } 196 elsif (($type eq "openbsd-a.out")) 197 { $openbsd=1; require "x86gas.pl"; } 198 else 199 { print STDERR <<"EOF"; 200Pick one target type from 201 elf - Linux, FreeBSD, Solaris x86, etc. 202 a.out - DJGPP, elder OpenBSD, etc. 203 coff - GAS/COFF such as Win32 targets 204 win32n - Windows 95/Windows NT NASM format 205 openbsd-elf - OpenBSD elf 206 openbsd-a.out - OpenBSD a.out 207 nw-nasm - NetWare NASM format 208 macosx - Mac OS X 209EOF 210 exit(1); 211 } 212 213 $pic=0; 214 for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); } 215 216 ::emitraw("#include <machine/asm.h>\n") if $openbsd; 217 $filename =~ s/\.pl$//; 218 &file($filename); 219} 220 2211; 222