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261 lines
6.1 KiB
261 lines
6.1 KiB
4 years ago
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#!/usr/bin/env perl
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# require 'x86asm.pl';
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# &asm_init(<flavor>,"des-586.pl"[,$i386only]);
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# &function_begin("foo");
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# ...
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# &function_end("foo");
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# &asm_finish
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$out=();
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$i386=0;
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# AUTOLOAD is this context has quite unpleasant side effect, namely
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# that typos in function calls effectively go to assembler output,
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# but on the pros side we don't have to implement one subroutine per
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# each opcode...
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sub ::AUTOLOAD
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{ my $opcode = $AUTOLOAD;
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die "more than 4 arguments passed to $opcode" if ($#_>3);
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$opcode =~ s/.*:://;
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if ($opcode =~ /^push/) { $stack+=4; }
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elsif ($opcode =~ /^pop/) { $stack-=4; }
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&generic($opcode,@_) or die "undefined subroutine \&$AUTOLOAD";
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}
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sub ::emit
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{ my $opcode=shift;
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if ($#_==-1) { push(@out,"\t$opcode\n"); }
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else { push(@out,"\t$opcode\t".join(',',@_)."\n"); }
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}
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sub ::LB
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{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
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$1."l";
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}
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sub ::HB
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{ $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
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$1."h";
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}
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sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num); }
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sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num); }
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sub ::blindpop { &pop($_[0]); $stack+=4; }
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sub ::wparam { &DWP($stack+4*$_[0],"esp"); }
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sub ::swtmp { &DWP(4*$_[0],"esp"); }
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sub ::bswap
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{ if ($i386) # emulate bswap for i386
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{ &comment("bswap @_");
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&xchg(&HB(@_),&LB(@_));
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&ror (@_,16);
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&xchg(&HB(@_),&LB(@_));
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}
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else
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{ &generic("bswap",@_); }
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}
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# These are made-up opcodes introduced over the years essentially
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# by ignorance, just alias them to real ones...
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sub ::movb { &mov(@_); }
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sub ::xorb { &xor(@_); }
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sub ::rotl { &rol(@_); }
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sub ::rotr { &ror(@_); }
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sub ::exch { &xchg(@_); }
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sub ::halt { &hlt; }
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sub ::movz { &movzx(@_); }
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sub ::pushf { &pushfd; }
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sub ::popf { &popfd; }
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# 3 argument instructions
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sub ::movq
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{ my($p1,$p2,$optimize)=@_;
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if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/)
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# movq between mmx registers can sink Intel CPUs
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{ &::pshufw($p1,$p2,0xe4); }
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else
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{ &::generic("movq",@_); }
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}
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# SSE>2 instructions
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my %regrm = ( "eax"=>0, "ecx"=>1, "edx"=>2, "ebx"=>3,
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"esp"=>4, "ebp"=>5, "esi"=>6, "edi"=>7 );
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sub ::pextrd
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{ my($dst,$src,$imm)=@_;
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if ("$dst:$src" =~ /(e[a-dsd][ixp]):xmm([0-7])/)
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{ &::data_byte(0x66,0x0f,0x3a,0x16,0xc0|($2<<3)|$regrm{$1},$imm); }
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else
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{ &::generic("pextrd",@_); }
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}
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sub ::pinsrd
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{ my($dst,$src,$imm)=@_;
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if ("$dst:$src" =~ /xmm([0-7]):(e[a-dsd][ixp])/)
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{ &::data_byte(0x66,0x0f,0x3a,0x22,0xc0|($1<<3)|$regrm{$2},$imm); }
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else
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{ &::generic("pinsrd",@_); }
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}
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sub ::pshufb
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{ my($dst,$src)=@_;
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if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
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{ &data_byte(0x66,0x0f,0x38,0x00,0xc0|($1<<3)|$2); }
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else
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{ &::generic("pshufb",@_); }
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}
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sub ::palignr
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{ my($dst,$src,$imm)=@_;
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if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
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{ &::data_byte(0x66,0x0f,0x3a,0x0f,0xc0|($1<<3)|$2,$imm); }
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else
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{ &::generic("palignr",@_); }
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}
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sub ::pclmulqdq
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{ my($dst,$src,$imm)=@_;
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if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
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{ &::data_byte(0x66,0x0f,0x3a,0x44,0xc0|($1<<3)|$2,$imm); }
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else
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{ &::generic("pclmulqdq",@_); }
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}
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sub ::rdrand
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{ my ($dst)=@_;
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if ($dst =~ /(e[a-dsd][ixp])/)
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{ &::data_byte(0x0f,0xc7,0xf0|$regrm{$dst}); }
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else
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{ &::generic("rdrand",@_); }
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}
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# label management
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$lbdecor="L"; # local label decoration, set by package
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$label="000";
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sub ::islabel # see is argument is a known label
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{ my $i;
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foreach $i (values %label) { return $i if ($i eq $_[0]); }
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$label{$_[0]}; # can be undef
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}
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sub ::label # instantiate a function-scope label
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{ if (!defined($label{$_[0]}))
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{ $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++; }
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$label{$_[0]};
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}
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sub ::LABEL # instantiate a file-scope label
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{ $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
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$label{$_[0]};
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}
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sub ::static_label { &::LABEL($_[0],$lbdecor.$_[0]); }
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sub ::set_label_B { push(@out,"@_:\n"); }
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sub ::set_label
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{ my $label=&::label($_[0]);
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&::align($_[1]) if ($_[1]>1);
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&::set_label_B($label);
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$label;
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}
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sub ::wipe_labels # wipes function-scope labels
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{ foreach $i (keys %label)
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{ delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/); }
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}
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# subroutine management
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sub ::function_begin
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{ &function_begin_B(@_);
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$stack=4;
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&push("ebp");
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&push("ebx");
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&push("esi");
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&push("edi");
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}
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sub ::function_end
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{ &pop("edi");
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&pop("esi");
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&pop("ebx");
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&pop("ebp");
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&ret();
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&function_end_B(@_);
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$stack=0;
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&wipe_labels();
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}
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sub ::function_end_A
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{ &pop("edi");
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&pop("esi");
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&pop("ebx");
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&pop("ebp");
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&ret();
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$stack+=16; # readjust esp as if we didn't pop anything
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}
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sub ::asciz
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{ my @str=unpack("C*",shift);
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push @str,0;
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while ($#str>15) {
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&data_byte(@str[0..15]);
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foreach (0..15) { shift @str; }
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}
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&data_byte(@str) if (@str);
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}
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sub ::asm_finish
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{ &file_end();
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print @out;
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}
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sub ::asm_init
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{ my ($type,$fn,$cpu)=@_;
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$filename=$fn;
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$i386=$cpu;
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$elf=$cpp=$coff=$aout=$macosx=$win32=$netware=$mwerks=$android=0;
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if (($type eq "elf"))
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{ $elf=1; require "x86gas.pl"; }
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elsif (($type eq "a\.out"))
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{ $aout=1; require "x86gas.pl"; }
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elsif (($type eq "coff" or $type eq "gaswin"))
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{ $coff=1; require "x86gas.pl"; }
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elsif (($type eq "win32n"))
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{ $win32=1; require "x86nasm.pl"; }
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elsif (($type eq "nw-nasm"))
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{ $netware=1; require "x86nasm.pl"; }
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#elsif (($type eq "nw-mwasm"))
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#{ $netware=1; $mwerks=1; require "x86nasm.pl"; }
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elsif (($type eq "win32"))
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{ $win32=1; require "x86masm.pl"; }
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elsif (($type eq "macosx"))
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{ $aout=1; $macosx=1; require "x86gas.pl"; }
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elsif (($type eq "android"))
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{ $elf=1; $android=1; require "x86gas.pl"; }
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else
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{ print STDERR <<"EOF";
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Pick one target type from
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elf - Linux, FreeBSD, Solaris x86, etc.
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a.out - DJGPP, elder OpenBSD, etc.
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coff - GAS/COFF such as Win32 targets
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win32n - Windows 95/Windows NT NASM format
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nw-nasm - NetWare NASM format
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macosx - Mac OS X
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EOF
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exit(1);
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}
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$pic=0;
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for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }
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$filename =~ s/\.pl$//;
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&file($filename);
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}
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1;
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