source: vbox/trunk/src/libs/openssl-3.1.0/crypto/perlasm/x86asm.pl@ 100908

#! /usr/bin/env perl
# Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the Apache License 2.0 (the "License").  You may not use
# this file except in compliance with the License.  You can obtain a copy
# in the file LICENSE in the source distribution or at
# https://www.openssl.org/source/license.html


# require 'x86asm.pl';
# &asm_init(<flavor>[,$i386only]);
# &function_begin("foo");
# ...
# &function_end("foo");
# &asm_finish

$out=();
$i386=0;

# AUTOLOAD is this context has quite unpleasant side effect, namely
# that typos in function calls effectively go to assembler output,
# but on the pros side we don't have to implement one subroutine per
# each opcode...
sub ::AUTOLOAD
{ my $opcode = $AUTOLOAD;

    die "more than 4 arguments passed to $opcode" if ($#_>3);

    $opcode =~ s/.*:://;
    if    ($opcode =~ /^push/) { $stack+=4; }
    elsif ($opcode =~ /^pop/)  { $stack-=4; }

    &generic($opcode,@_) or die "undefined subroutine \&$AUTOLOAD";
}

sub ::emit
{ my $opcode=shift;

    if ($#_==-1)    { push(@out,"\t$opcode\n");                         }
    else            { push(@out,"\t$opcode\t".join(',',@_)."\n");       }
}

sub ::LB
{   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'low byte'";
  $1."l";
}
sub ::HB
{   $_[0] =~ m/^e?([a-d])x$/o or die "$_[0] does not have a 'high byte'";
  $1."h";
}
sub ::stack_push{ my $num=$_[0]*4; $stack+=$num; &sub("esp",$num);      }
sub ::stack_pop { my $num=$_[0]*4; $stack-=$num; &add("esp",$num);      }
sub ::blindpop  { &pop($_[0]); $stack+=4;                               }
sub ::wparam    { &DWP($stack+4*$_[0],"esp");                           }
sub ::swtmp     { &DWP(4*$_[0],"esp");                                  }

sub ::bswap
{   if ($i386)  # emulate bswap for i386
    {   &comment("bswap @_");
        &xchg(&HB(@_),&LB(@_));
        &ror (@_,16);
        &xchg(&HB(@_),&LB(@_));
    }
    else
    {   &generic("bswap",@_);   }
}
# These are made-up opcodes introduced over the years essentially
# by ignorance, just alias them to real ones...
sub ::movb      { &mov(@_);     }
sub ::xorb      { &xor(@_);     }
sub ::rotl      { &rol(@_);     }
sub ::rotr      { &ror(@_);     }
sub ::exch      { &xchg(@_);    }
sub ::halt      { &hlt;         }
sub ::movz      { &movzx(@_);   }
sub ::pushf     { &pushfd;      }
sub ::popf      { &popfd;       }

# 3 argument instructions
sub ::movq
{ my($p1,$p2,$optimize)=@_;

    if ($optimize && $p1=~/^mm[0-7]$/ && $p2=~/^mm[0-7]$/)
    # movq between mmx registers can sink Intel CPUs
    {   &::pshufw($p1,$p2,0xe4);                }
    else
    {   &::generic("movq",@_);                  }
}

# SSE>2 instructions
my %regrm = (   "eax"=>0, "ecx"=>1, "edx"=>2, "ebx"=>3,
                "esp"=>4, "ebp"=>5, "esi"=>6, "edi"=>7  );
sub ::pextrd
{ my($dst,$src,$imm)=@_;
    if ("$dst:$src" =~ /(e[a-dsd][ixp]):xmm([0-7])/)
    {   &::data_byte(0x66,0x0f,0x3a,0x16,0xc0|($2<<3)|$regrm{$1},$imm); }
    else
    {   &::generic("pextrd",@_);                }
}

sub ::pinsrd
{ my($dst,$src,$imm)=@_;
    if ("$dst:$src" =~ /xmm([0-7]):(e[a-dsd][ixp])/)
    {   &::data_byte(0x66,0x0f,0x3a,0x22,0xc0|($1<<3)|$regrm{$2},$imm); }
    else
    {   &::generic("pinsrd",@_);                }
}

sub ::pshufb
{ my($dst,$src)=@_;
    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
    {   &data_byte(0x66,0x0f,0x38,0x00,0xc0|($1<<3)|$2);        }
    else
    {   &::generic("pshufb",@_);                }
}

sub ::palignr
{ my($dst,$src,$imm)=@_;
    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
    {   &::data_byte(0x66,0x0f,0x3a,0x0f,0xc0|($1<<3)|$2,$imm); }
    else
    {   &::generic("palignr",@_);               }
}

sub ::pclmulqdq
{ my($dst,$src,$imm)=@_;
    if ("$dst:$src" =~ /xmm([0-7]):xmm([0-7])/)
    {   &::data_byte(0x66,0x0f,0x3a,0x44,0xc0|($1<<3)|$2,$imm); }
    else
    {   &::generic("pclmulqdq",@_);             }
}

sub ::rdrand
{ my ($dst)=@_;
    if ($dst =~ /(e[a-dsd][ixp])/)
    {   &::data_byte(0x0f,0xc7,0xf0|$regrm{$dst});      }
    else
    {   &::generic("rdrand",@_);        }
}

sub ::rdseed
{ my ($dst)=@_;
    if ($dst =~ /(e[a-dsd][ixp])/)
    {   &::data_byte(0x0f,0xc7,0xf8|$regrm{$dst});      }
    else
    {   &::generic("rdrand",@_);        }
}

sub rxb {
 local *opcode=shift;
 my ($dst,$src1,$src2,$rxb)=@_;

   $rxb|=0x7<<5;
   $rxb&=~(0x04<<5) if($dst>=8);
   $rxb&=~(0x01<<5) if($src1>=8);
   $rxb&=~(0x02<<5) if($src2>=8);
   push @opcode,$rxb;
}

sub ::vprotd
{ my $args=join(',',@_);
    if ($args =~ /xmm([0-7]),xmm([0-7]),([x0-9a-f]+)/)
    { my @opcode=(0x8f);
        rxb(\@opcode,$1,$2,-1,0x08);
        push @opcode,0x78,0xc2;
        push @opcode,0xc0|($2&7)|(($1&7)<<3);           # ModR/M
        my $c=$3;
        push @opcode,$c=~/^0/?oct($c):$c;
        &::data_byte(@opcode);
    }
    else
    {   &::generic("vprotd",@_);        }
}

sub ::endbranch
{
    &::generic("#ifdef __CET__\n");
    &::data_byte(0xf3,0x0f,0x1e,0xfb);
    &::generic("#endif\n");
}

# label management
$lbdecor="L";           # local label decoration, set by package
$label="000";

sub ::islabel           # see is argument is a known label
{ my $i;
    foreach $i (values %label) { return $i if ($i eq $_[0]); }
  $label{$_[0]};        # can be undef
}

sub ::label             # instantiate a function-scope label
{   if (!defined($label{$_[0]}))
    {   $label{$_[0]}="${lbdecor}${label}${_[0]}"; $label++;   }
  $label{$_[0]};
}

sub ::LABEL             # instantiate a file-scope label
{   $label{$_[0]}=$_[1] if (!defined($label{$_[0]}));
  $label{$_[0]};
}

sub ::static_label      { &::LABEL($_[0],$lbdecor.$_[0]); }

sub ::set_label_B       { push(@out,"@_:\n"); }
sub ::set_label
{ my $label=&::label($_[0]);
    &::align($_[1]) if ($_[1]>1);
    &::set_label_B($label);
  $label;
}

sub ::wipe_labels       # wipes function-scope labels
{   foreach $i (keys %label)
    {   delete $label{$i} if ($label{$i} =~ /^\Q${lbdecor}\E[0-9]{3}/); }
}

# subroutine management
sub ::function_begin
{   &function_begin_B(@_);
    $stack=4;
    &push("ebp");
    &push("ebx");
    &push("esi");
    &push("edi");
}

sub ::function_end
{   &pop("edi");
    &pop("esi");
    &pop("ebx");
    &pop("ebp");
    &ret();
    &function_end_B(@_);
    $stack=0;
    &wipe_labels();
}

sub ::function_end_A
{   &pop("edi");
    &pop("esi");
    &pop("ebx");
    &pop("ebp");
    &ret();
    $stack+=16; # readjust esp as if we didn't pop anything
}

sub ::asciz
{ my @str=unpack("C*",shift);
    push @str,0;
    while ($#str>15) {
        &data_byte(@str[0..15]);
        foreach (0..15) { shift @str; }
    }
    &data_byte(@str) if (@str);
}

sub ::asm_finish
{   &file_end();
    print @out;
}

sub ::asm_init
{ my ($type,$cpu)=@_;

    $i386=$cpu;

    $elf=$cpp=$coff=$aout=$macosx=$win32=$mwerks=$android=0;
    if    (($type eq "elf"))
    {   $elf=1;                 require "x86gas.pl";    }
    elsif (($type eq "elf-1"))
    {   $elf=-1;                require "x86gas.pl";    }
    elsif (($type eq "a\.out"))
    {   $aout=1;                require "x86gas.pl";    }
    elsif (($type eq "coff" or $type eq "gaswin"))
    {   $coff=1;                require "x86gas.pl";    }
    elsif (($type eq "win32n"))
    {   $win32=1;               require "x86nasm.pl";   }
    elsif (($type eq "win32"))
    {   $win32=1;               require "x86masm.pl";   }
    elsif (($type eq "macosx"))
    {   $aout=1; $macosx=1;     require "x86gas.pl";    }
    elsif (($type eq "android"))
    {   $elf=1; $android=1;     require "x86gas.pl";    }
    else
    {   print STDERR <<"EOF";
Pick one target type from
        elf     - Linux, FreeBSD, Solaris x86, etc.
        a.out   - DJGPP, elder OpenBSD, etc.
        coff    - GAS/COFF such as Win32 targets
        win32n  - Windows 95/Windows NT NASM format
        macosx  - Mac OS X
EOF
        exit(1);
    }

    $pic=0;
    for (@ARGV) { $pic=1 if (/\-[fK]PIC/i); }

    &file();
}

sub ::hidden {}

1;