256 lines
5 KiB
Perl
256 lines
5 KiB
Perl
#!/usr/bin/env perl
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package x86nasm;
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*out=\@::out;
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$lprfx="\@L";
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$label="000";
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$under=($::netware)?'':'_';
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$initseg="";
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sub ::generic
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{ my $opcode=shift;
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my $tmp;
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if (!$::mwerks)
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{ if ($opcode =~ m/^j/o && $#_==0) # optimize jumps
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{ $_[0] = "NEAR $_[0]"; }
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elsif ($opcode eq "lea" && $#_==1)# wipe storage qualifier from lea
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{ $_[1] =~ s/^[^\[]*\[/\[/o; }
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}
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&::emit($opcode,@_);
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1;
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}
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#
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# opcodes not covered by ::generic above, mostly inconsistent namings...
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#
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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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sub ::call { &::emit("call",(&islabel($_[0]) or "$under$_[0]")); }
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sub ::call_ptr { &::emit("call",@_); }
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sub ::jmp_ptr { &::emit("jmp",@_); }
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# chosen SSE 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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{ &::emit("movq",@_); }
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}
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sub ::pshufw { &::emit("pshufw",@_); }
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sub get_mem
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{ my($size,$addr,$reg1,$reg2,$idx)=@_;
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my($post,$ret);
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if ($size ne "")
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{ $ret .= "$size";
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$ret .= " PTR" if ($::mwerks);
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$ret .= " ";
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}
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$ret .= "[";
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$addr =~ s/^\s+//;
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# prepend global references with optional underscore
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$addr =~ s/^([^\+\-0-9][^\+\-]*)/islabel($1) or "$under$1"/ige;
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# put address arithmetic expression in parenthesis
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$addr="($addr)" if ($addr =~ /^.+[\-\+].+$/);
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if (($addr ne "") && ($addr ne 0))
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{ if ($addr !~ /^-/) { $ret .= "$addr+"; }
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else { $post=$addr; }
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}
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if ($reg2 ne "")
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{ $idx!=0 or $idx=1;
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$ret .= "$reg2*$idx";
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$ret .= "+$reg1" if ($reg1 ne "");
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}
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else
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{ $ret .= "$reg1"; }
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$ret .= "$post]";
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$ret =~ s/\+\]/]/; # in case $addr was the only argument
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$ret;
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}
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sub ::BP { &get_mem("BYTE",@_); }
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sub ::DWP { &get_mem("DWORD",@_); }
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sub ::QWP { &get_mem("",@_); }
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sub ::BC { (($::mwerks)?"":"BYTE ")."@_"; }
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sub ::DWC { (($::mwerks)?"":"DWORD ")."@_"; }
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sub ::file
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{ if ($::mwerks) { push(@out,".section\t.text\n"); }
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else
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{ my $tmp=<<___;
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%ifdef __omf__
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section code use32 class=code align=64
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%else
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section .text code align=64
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%endif
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___
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push(@out,$tmp);
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}
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}
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sub ::function_begin_B
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{ my $func=$under.shift;
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my $tmp=<<___;
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global $func
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align 16
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$func:
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___
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push(@out,$tmp);
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$::stack=4;
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}
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sub ::function_end_B
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{ my $i;
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foreach $i (%label) { undef $label{$i} if ($label{$i} =~ /^$prfx/); }
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$::stack=0;
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}
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sub ::file_end
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{ # try to detect if SSE2 or MMX extensions were used on Win32...
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if ($::win32 && grep {/\b[x]?mm[0-7]\b|OPENSSL_ia32cap_P\b/i} @out)
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{ # $1<<10 sets a reserved bit to signal that variable
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# was initialized already...
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my $code=<<___;
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align 16
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${lprfx}OPENSSL_ia32cap_init:
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lea edx,[${under}OPENSSL_ia32cap_P]
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cmp DWORD [edx],0
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jne NEAR ${lprfx}nocpuid
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mov DWORD [edx],1<<10
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pushfd
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pop eax
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mov ecx,eax
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xor eax,1<<21
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push eax
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popfd
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pushfd
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pop eax
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xor eax,ecx
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bt eax,21
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jnc NEAR ${lprfx}nocpuid
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push ebp
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push edi
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push ebx
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mov edi,edx
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xor eax,eax
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cpuid
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xor eax,eax
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cmp ebx,'Genu'
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setne al
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mov ebp,eax
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cmp edx,'ineI'
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setne al
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or ebp,eax
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cmp eax,'ntel'
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setne al
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or ebp,eax
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mov eax,1
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cpuid
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cmp ebp,0
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jne ${lprfx}notP4
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and ah,15
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cmp ah,15
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jne ${lprfx}notP4
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or edx,1<<20
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${lprfx}notP4:
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bt edx,28
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jnc ${lprfx}done
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shr ebx,16
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cmp bl,1
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ja ${lprfx}done
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and edx,0xefffffff
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${lprfx}done:
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or edx,1<<10
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mov DWORD [edi],edx
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pop ebx
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pop edi
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pop ebp
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${lprfx}nocpuid:
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ret
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segment .CRT\$XCU data align=4
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dd ${lprfx}OPENSSL_ia32cap_init
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___
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my $data=<<___;
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segment .bss
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common ${under}OPENSSL_ia32cap_P 4
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___
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#<not needed in OpenSSL context>#push (@out,$code);
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# comment out OPENSSL_ia32cap_P declarations
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grep {s/(^extern\s+${under}OPENSSL_ia32cap_P)/\;$1/} @out;
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push (@out,$data)
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}
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push (@out,$initseg) if ($initseg);
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}
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sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } }
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sub islabel # see is argument is known label
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{ my $i;
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foreach $i (%label) { return $label{$i} if ($label{$i} eq $_[0]); }
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undef;
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}
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sub ::external_label
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{ push(@labels,@_);
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foreach (@_)
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{ push(@out,".") if ($::mwerks);
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push(@out, "extern\t${under}$_\n");
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}
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}
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sub ::public_label
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{ $label{$_[0]}="${under}${_[0]}" if (!defined($label{$_[0]}));
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push(@out,"global\t$label{$_[0]}\n");
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}
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sub ::label
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{ if (!defined($label{$_[0]}))
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{ $label{$_[0]}="${lprfx}${label}${_[0]}"; $label++; }
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$label{$_[0]};
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}
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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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push(@out,"$label{$_[0]}:\n");
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}
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sub ::data_byte
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{ push(@out,(($::mwerks)?".byte\t":"db\t").join(',',@_)."\n"); }
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sub ::data_word
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{ push(@out,(($::mwerks)?".long\t":"dd\t").join(',',@_)."\n"); }
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sub ::align
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{ push(@out,".") if ($::mwerks); push(@out,"align\t$_[0]\n"); }
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sub ::picmeup
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{ my($dst,$sym)=@_;
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&::lea($dst,&::DWP($sym));
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}
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sub ::initseg
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{ my($f)=$under.shift;
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if ($::win32)
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{ $initseg=<<___;
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segment .CRT\$XCU data align=4
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extern $f
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dd $f
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___
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}
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}
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1;
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