| #!/usr/bin/env perl |
| |
| package x86nasm; |
| |
| *out=\@::out; |
| |
| $::lbdecor="L\$"; # local label decoration |
| $nmdecor=$::netware?"":"_"; # external name decoration |
| $drdecor=$::mwerks?".":""; # directive decoration |
| |
| $initseg=""; |
| |
| sub ::generic |
| { my $opcode=shift; |
| my $tmp; |
| |
| if (!$::mwerks) |
| { if ($opcode =~ m/^j/o && $#_==0) # optimize jumps |
| { $_[0] = "NEAR $_[0]"; } |
| elsif ($opcode eq "lea" && $#_==1) # wipe storage qualifier from lea |
| { $_[1] =~ s/^[^\[]*\[/\[/o; } |
| elsif ($opcode eq "clflush" && $#_==0) |
| { $_[0] =~ s/^[^\[]*\[/\[/o; } |
| } |
| &::emit($opcode,@_); |
| 1; |
| } |
| # |
| # opcodes not covered by ::generic above, mostly inconsistent namings... |
| # |
| sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); } |
| sub ::call_ptr { &::emit("call",@_); } |
| sub ::jmp_ptr { &::emit("jmp",@_); } |
| |
| sub get_mem |
| { my($size,$addr,$reg1,$reg2,$idx)=@_; |
| my($post,$ret); |
| |
| if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; } |
| |
| if ($size ne "") |
| { $ret .= "$size"; |
| $ret .= " PTR" if ($::mwerks); |
| $ret .= " "; |
| } |
| $ret .= "["; |
| |
| $addr =~ s/^\s+//; |
| # prepend global references with optional underscore |
| $addr =~ s/^([^\+\-0-9][^\+\-]*)/::islabel($1) or "$nmdecor$1"/ige; |
| # put address arithmetic expression in parenthesis |
| $addr="($addr)" if ($addr =~ /^.+[\-\+].+$/); |
| |
| if (($addr ne "") && ($addr ne 0)) |
| { if ($addr !~ /^-/) { $ret .= "$addr+"; } |
| else { $post=$addr; } |
| } |
| |
| if ($reg2 ne "") |
| { $idx!=0 or $idx=1; |
| $ret .= "$reg2*$idx"; |
| $ret .= "+$reg1" if ($reg1 ne ""); |
| } |
| else |
| { $ret .= "$reg1"; } |
| |
| $ret .= "$post]"; |
| $ret =~ s/\+\]/]/; # in case $addr was the only argument |
| |
| $ret; |
| } |
| sub ::BP { &get_mem("BYTE",@_); } |
| sub ::DWP { &get_mem("DWORD",@_); } |
| sub ::WP { &get_mem("WORD",@_); } |
| sub ::QWP { &get_mem("",@_); } |
| sub ::BC { (($::mwerks)?"":"BYTE ")."@_"; } |
| sub ::DWC { (($::mwerks)?"":"DWORD ")."@_"; } |
| |
| sub ::file |
| { if ($::mwerks) { push(@out,".section\t.text,64\n"); } |
| else |
| { my $tmp=<<___; |
| %ifidn __OUTPUT_FORMAT__,obj |
| section code use32 class=code align=64 |
| %elifidn __OUTPUT_FORMAT__,win32 |
| %ifdef __YASM_VERSION_ID__ |
| %if __YASM_VERSION_ID__ < 01010000h |
| %error yasm version 1.1.0 or later needed. |
| %endif |
| ; Yasm automatically includes @feat.00 and complains about redefining it. |
| ; https://www.tortall.net/projects/yasm/manual/html/objfmt-win32-safeseh.html |
| %else |
| \$\@feat.00 equ 1 |
| %endif |
| section .text code align=64 |
| %else |
| section .text code |
| %endif |
| ___ |
| push(@out,$tmp); |
| } |
| } |
| |
| sub ::function_begin_B |
| { my $func=shift; |
| my $global=($func !~ /^_/); |
| my $begin="${::lbdecor}_${func}_begin"; |
| |
| $begin =~ s/^\@/./ if ($::mwerks); # the torture never stops |
| |
| &::LABEL($func,$global?"$begin":"$nmdecor$func"); |
| $func=$nmdecor.$func; |
| |
| push(@out,"${drdecor}global $func\n") if ($global); |
| push(@out,"${drdecor}align 16\n"); |
| push(@out,"$func:\n"); |
| push(@out,"$begin:\n") if ($global); |
| $::stack=4; |
| } |
| |
| sub ::function_end_B |
| { $::stack=0; |
| &::wipe_labels(); |
| } |
| |
| sub ::file_end |
| { if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) |
| { my $comm=<<___; |
| ${drdecor}segment .bss |
| ${drdecor}common ${nmdecor}OPENSSL_ia32cap_P 16 |
| ___ |
| # comment out OPENSSL_ia32cap_P declarations |
| grep {s/(^extern\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out; |
| push (@out,$comm) |
| } |
| push (@out,$initseg) if ($initseg); |
| } |
| |
| sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } } |
| |
| sub ::external_label |
| { foreach(@_) |
| { push(@out,"${drdecor}extern\t".&::LABEL($_,$nmdecor.$_)."\n"); } |
| } |
| |
| sub ::public_label |
| { push(@out,"${drdecor}global\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); } |
| |
| sub ::data_byte |
| { push(@out,(($::mwerks)?".byte\t":"db\t").join(',',@_)."\n"); } |
| sub ::data_short |
| { push(@out,(($::mwerks)?".word\t":"dw\t").join(',',@_)."\n"); } |
| sub ::data_word |
| { push(@out,(($::mwerks)?".long\t":"dd\t").join(',',@_)."\n"); } |
| |
| sub ::align |
| { push(@out,"${drdecor}align\t$_[0]\n"); } |
| |
| sub ::picmeup |
| { my($dst,$sym)=@_; |
| &::lea($dst,&::DWP($sym)); |
| } |
| |
| sub ::initseg |
| { my $f=$nmdecor.shift; |
| if ($::win32) |
| { $initseg=<<___; |
| segment .CRT\$XCU data align=4 |
| extern $f |
| dd $f |
| ___ |
| } |
| } |
| |
| sub ::dataseg |
| { if ($mwerks) { push(@out,".section\t.data,4\n"); } |
| else { push(@out,"section\t.data align=4\n"); } |
| } |
| |
| sub ::safeseh |
| { my $nm=shift; |
| push(@out,"%if __NASM_VERSION_ID__ >= 0x02030000\n"); |
| push(@out,"safeseh ".&::LABEL($nm,$nmdecor.$nm)."\n"); |
| push(@out,"%endif\n"); |
| } |
| |
| 1; |