536 lines
9.2 KiB
Perl
536 lines
9.2 KiB
Perl
#!/usr/local/bin/perl
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package x86unix;
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$label="L000";
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$const="";
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$align=($main'aout)?"4":"16";
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$under=($main'aout)?"_":"";
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$com_start=($main'sol)?"/":"#";
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sub main'asm_init_output { @out=(); }
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sub main'asm_get_output { return(@out); }
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sub main'get_labels { return(@labels); }
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sub main'external_label { push(@labels,@_); }
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if ($main'cpp)
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{
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$align="ALIGN";
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$under="";
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$com_start='/*';
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$com_end='*/';
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}
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%lb=( 'eax', '%al',
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'ebx', '%bl',
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'ecx', '%cl',
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'edx', '%dl',
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'ax', '%al',
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'bx', '%bl',
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'cx', '%cl',
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'dx', '%dl',
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);
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%hb=( 'eax', '%ah',
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'ebx', '%bh',
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'ecx', '%ch',
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'edx', '%dh',
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'ax', '%ah',
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'bx', '%bh',
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'cx', '%ch',
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'dx', '%dh',
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);
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%regs=( 'eax', '%eax',
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'ebx', '%ebx',
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'ecx', '%ecx',
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'edx', '%edx',
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'esi', '%esi',
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'edi', '%edi',
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'ebp', '%ebp',
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'esp', '%esp',
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);
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%reg_val=(
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'eax', 0x00,
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'ebx', 0x03,
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'ecx', 0x01,
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'edx', 0x02,
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'esi', 0x06,
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'edi', 0x07,
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'ebp', 0x05,
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'esp', 0x04,
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);
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sub main'LB
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{
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(defined($lb{$_[0]})) || die "$_[0] does not have a 'low byte'\n";
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return($lb{$_[0]});
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}
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sub main'HB
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{
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(defined($hb{$_[0]})) || die "$_[0] does not have a 'high byte'\n";
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return($hb{$_[0]});
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}
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sub main'DWP
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{
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local($addr,$reg1,$reg2,$idx)=@_;
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$ret="";
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$addr =~ s/(^|[+ \t])([A-Za-z_]+)($|[+ \t])/$1$under$2$3/;
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$reg1="$regs{$reg1}" if defined($regs{$reg1});
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$reg2="$regs{$reg2}" if defined($regs{$reg2});
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$ret.=$addr if ($addr ne "") && ($addr ne 0);
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if ($reg2 ne "")
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{
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if($idx ne "")
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{ $ret.="($reg1,$reg2,$idx)"; }
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else
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{ $ret.="($reg1,$reg2)"; }
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}
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else
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{ $ret.="($reg1)" }
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return($ret);
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}
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sub main'BP
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{
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return(&main'DWP(@_));
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}
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sub main'BC
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{
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return @_;
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}
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sub main'DWC
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{
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return @_;
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}
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#sub main'BP
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# {
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# local($addr,$reg1,$reg2,$idx)=@_;
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#
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# $ret="";
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#
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# $addr =~ s/(^|[+ \t])([A-Za-z_]+)($|[+ \t])/$1$under$2$3/;
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# $reg1="$regs{$reg1}" if defined($regs{$reg1});
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# $reg2="$regs{$reg2}" if defined($regs{$reg2});
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# $ret.=$addr if ($addr ne "") && ($addr ne 0);
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# if ($reg2 ne "")
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# { $ret.="($reg1,$reg2,$idx)"; }
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# else
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# { $ret.="($reg1)" }
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# return($ret);
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# }
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sub main'mov { &out2("movl",@_); }
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sub main'movb { &out2("movb",@_); }
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sub main'and { &out2("andl",@_); }
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sub main'or { &out2("orl",@_); }
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sub main'shl { &out2("sall",@_); }
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sub main'shr { &out2("shrl",@_); }
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sub main'xor { &out2("xorl",@_); }
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sub main'xorb { &out2("xorb",@_); }
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sub main'add { &out2("addl",@_); }
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sub main'adc { &out2("adcl",@_); }
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sub main'sub { &out2("subl",@_); }
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sub main'rotl { &out2("roll",@_); }
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sub main'rotr { &out2("rorl",@_); }
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sub main'exch { &out2("xchg",@_); }
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sub main'cmp { &out2("cmpl",@_); }
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sub main'lea { &out2("leal",@_); }
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sub main'mul { &out1("mull",@_); }
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sub main'div { &out1("divl",@_); }
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sub main'jmp { &out1("jmp",@_); }
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sub main'jmp_ptr { &out1p("jmp",@_); }
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sub main'je { &out1("je",@_); }
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sub main'jle { &out1("jle",@_); }
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sub main'jne { &out1("jne",@_); }
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sub main'jnz { &out1("jnz",@_); }
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sub main'jz { &out1("jz",@_); }
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sub main'jge { &out1("jge",@_); }
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sub main'jl { &out1("jl",@_); }
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sub main'jb { &out1("jb",@_); }
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sub main'jc { &out1("jc",@_); }
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sub main'jnc { &out1("jnc",@_); }
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sub main'jno { &out1("jno",@_); }
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sub main'dec { &out1("decl",@_); }
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sub main'inc { &out1("incl",@_); }
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sub main'push { &out1("pushl",@_); $stack+=4; }
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sub main'pop { &out1("popl",@_); $stack-=4; }
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sub main'not { &out1("notl",@_); }
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sub main'call { &out1("call",$under.$_[0]); }
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sub main'ret { &out0("ret"); }
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sub main'nop { &out0("nop"); }
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# The bswapl instruction is new for the 486. Emulate if i386.
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sub main'bswap
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{
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if ($main'i386)
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{
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&main'comment("bswapl @_");
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&main'exch(main'HB(@_),main'LB(@_));
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&main'rotr(@_,16);
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&main'exch(main'HB(@_),main'LB(@_));
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}
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else
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{
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&out1("bswapl",@_);
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}
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}
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sub out2
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{
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local($name,$p1,$p2)=@_;
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local($l,$ll,$t);
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local(%special)=( "roll",0xD1C0,"rorl",0xD1C8,
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"rcll",0xD1D0,"rcrl",0xD1D8,
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"shll",0xD1E0,"shrl",0xD1E8,
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"sarl",0xD1F8);
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if ((defined($special{$name})) && defined($regs{$p1}) && ($p2 == 1))
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{
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$op=$special{$name}|$reg_val{$p1};
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$tmp1=sprintf(".byte %d\n",($op>>8)&0xff);
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$tmp2=sprintf(".byte %d\t",$op &0xff);
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push(@out,$tmp1);
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push(@out,$tmp2);
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$p2=&conv($p2);
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$p1=&conv($p1);
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&main'comment("$name $p2 $p1");
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return;
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}
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push(@out,"\t$name\t");
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$t=&conv($p2).",";
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$l=length($t);
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push(@out,$t);
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$ll=4-($l+9)/8;
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$tmp1=sprintf("\t" x $ll);
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push(@out,$tmp1);
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push(@out,&conv($p1)."\n");
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}
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sub out1
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{
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local($name,$p1)=@_;
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local($l,$t);
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local(%special)=("bswapl",0x0FC8);
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if ((defined($special{$name})) && defined($regs{$p1}))
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{
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$op=$special{$name}|$reg_val{$p1};
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$tmp1=sprintf(".byte %d\n",($op>>8)&0xff);
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$tmp2=sprintf(".byte %d\t",$op &0xff);
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push(@out,$tmp1);
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push(@out,$tmp2);
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$p2=&conv($p2);
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$p1=&conv($p1);
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&main'comment("$name $p2 $p1");
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return;
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}
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push(@out,"\t$name\t".&conv($p1)."\n");
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}
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sub out1p
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{
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local($name,$p1)=@_;
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local($l,$t);
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push(@out,"\t$name\t*".&conv($p1)."\n");
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}
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sub out0
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{
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push(@out,"\t$_[0]\n");
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}
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sub conv
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{
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local($p)=@_;
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# $p =~ s/0x([0-9A-Fa-f]+)/0$1h/;
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$p=$regs{$p} if (defined($regs{$p}));
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$p =~ s/^(-{0,1}[0-9A-Fa-f]+)$/\$$1/;
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$p =~ s/^(0x[0-9A-Fa-f]+)$/\$$1/;
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return $p;
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}
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sub main'file
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{
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local($file)=@_;
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local($tmp)=<<"EOF";
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.file "$file.s"
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.version "01.01"
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gcc2_compiled.:
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EOF
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push(@out,$tmp);
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}
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sub main'function_begin
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{
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local($func)=@_;
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&main'external_label($func);
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$func=$under.$func;
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local($tmp)=<<"EOF";
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.text
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.align $align
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.globl $func
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EOF
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push(@out,$tmp);
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if ($main'cpp)
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{ $tmp=push(@out,"\tTYPE($func,\@function)\n"); }
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elsif ($main'gaswin)
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{ $tmp=push(@out,"\t.def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
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else { $tmp=push(@out,"\t.type\t$func,\@function\n"); }
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push(@out,"$func:\n");
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$tmp=<<"EOF";
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pushl %ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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EOF
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push(@out,$tmp);
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$stack=20;
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}
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sub main'function_begin_B
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{
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local($func,$extra)=@_;
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&main'external_label($func);
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$func=$under.$func;
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local($tmp)=<<"EOF";
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.text
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.align $align
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.globl $func
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EOF
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push(@out,$tmp);
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if ($main'cpp)
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{ push(@out,"\tTYPE($func,\@function)\n"); }
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elsif ($main'gaswin)
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{ $tmp=push(@out,"\t.def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
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else { push(@out,"\t.type $func,\@function\n"); }
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push(@out,"$func:\n");
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$stack=4;
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}
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sub main'function_end
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{
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local($func)=@_;
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$func=$under.$func;
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local($tmp)=<<"EOF";
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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ret
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$const
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.${func}_end:
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EOF
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push(@out,$tmp);
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$const="";
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if ($main'cpp)
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{ push(@out,"\tSIZE($func,.${func}_end-$func)\n"); }
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elsif ($main'gaswin)
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{ $tmp=push(@out,"\t.align 4\n"); }
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else { push(@out,"\t.size\t$func,.${func}_end-$func\n"); }
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push(@out,".ident \"$func\"\n");
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$stack=0;
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%label=();
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}
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sub main'function_end_A
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{
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local($func)=@_;
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local($tmp)=<<"EOF";
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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ret
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EOF
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push(@out,$tmp);
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}
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sub main'function_end_B
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{
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local($func)=@_;
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$func=$under.$func;
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push(@out,".L_${func}_end:\n");
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if ($main'cpp)
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{ push(@out,"\tSIZE($func,.L_${func}_end-$func)\n"); }
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elsif ($main'gaswin)
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{ push(@out,"\t.align 4\n"); }
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else { push(@out,"\t.size\t$func,.L_${func}_end-$func\n"); }
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push(@out,".ident \"desasm.pl\"\n");
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$stack=0;
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%label=();
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}
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sub main'wparam
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{
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local($num)=@_;
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return(&main'DWP($stack+$num*4,"esp","",0));
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}
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sub main'stack_push
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{
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local($num)=@_;
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$stack+=$num*4;
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&main'sub("esp",$num*4);
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}
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sub main'stack_pop
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{
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local($num)=@_;
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$stack-=$num*4;
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&main'add("esp",$num*4);
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}
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sub main'swtmp
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{
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return(&main'DWP($_[0]*4,"esp","",0));
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}
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# Should use swtmp, which is above esp. Linix can trash the stack above esp
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#sub main'wtmp
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# {
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# local($num)=@_;
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#
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# return(&main'DWP(-($num+1)*4,"esp","",0));
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# }
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sub main'comment
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{
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foreach (@_)
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{
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if (/^\s*$/)
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{ push(@out,"\n"); }
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else
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{ push(@out,"\t$com_start $_ $com_end\n"); }
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}
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}
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sub main'label
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{
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if (!defined($label{$_[0]}))
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{
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$label{$_[0]}=".${label}${_[0]}";
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$label++;
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}
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return($label{$_[0]});
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}
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sub main'set_label
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{
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if (!defined($label{$_[0]}))
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{
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$label{$_[0]}=".${label}${_[0]}";
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$label++;
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}
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push(@out,".align $align\n") if ($_[1] != 0);
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push(@out,"$label{$_[0]}:\n");
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}
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sub main'file_end
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{
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}
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sub main'data_word
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{
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push(@out,"\t.long $_[0]\n");
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}
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# debug output functions: puts, putx, printf
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sub main'puts
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{
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&pushvars();
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&main'push('$Lstring' . ++$constl);
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&main'call('puts');
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$stack-=4;
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&main'add("esp",4);
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&popvars();
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$const .= "Lstring$constl:\n\t.string \"@_[0]\"\n";
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}
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sub main'putx
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{
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&pushvars();
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&main'push($_[0]);
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&main'push('$Lstring' . ++$constl);
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&main'call('printf');
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$stack-=8;
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&main'add("esp",8);
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&popvars();
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$const .= "Lstring$constl:\n\t.string \"\%X\"\n";
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}
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sub main'printf
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{
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$ostack = $stack;
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&pushvars();
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for ($i = @_ - 1; $i >= 0; $i--)
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{
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$constl++;
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if ($i == 0) # change this to support %s format strings
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{
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&main'push('$Lstring' . $constl);
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$const .= "Lstring$constl:\n\t.string \"@_[$i]\"\n";
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}
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else
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{
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if ($_[$i] =~ /([0-9]*)\(%esp\)/)
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{
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&main'push(($1 + $stack - $ostack) . '(%esp)');
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}
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else
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{
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&main'push($_[$i]);
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}
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}
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}
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&main'call('printf');
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$stack-=4*@_;
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&popvars();
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&main'add("esp",4*@_);
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}
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sub pushvars
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{
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&main'push("edx");
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&main'push("ecx");
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&main'push("eax");
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}
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sub popvars
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{
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&main'pop("eax");
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&main'pop("ecx");
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&main'pop("edx");
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}
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