x86_64-xlate.pl

OpenSSL 0.9.8k 最新版OpenSSL

	    $self->{value};
	} elsif ($current_function->{abi} eq "svr4") {
	    my $func =	"$current_function->{name}	PROC\n".
			"	mov	QWORD PTR 8[rsp],rdi\t;WIN64 prologue\n".
			"	mov	QWORD PTR 16[rsp],rsi\n";
	    my $narg = $current_function->{narg};
	    $narg=6 if (!defined($narg));
	    $func .= "	mov	rdi,rcx\n" if ($narg>0);
	    $func .= "	mov	rsi,rdx\n" if ($narg>1);
	    $func .= "	mov	rdx,r8\n"  if ($narg>2);
	    $func .= "	mov	rcx,r9\n"  if ($narg>3);
	    $func .= "	mov	r8,QWORD PTR 40[rsp]\n" if ($narg>4);
	    $func .= "	mov	r9,QWORD PTR 48[rsp]\n" if ($narg>5);
	    $func .= "\n";
	} else {
	   "$current_function->{name}	PROC";
	}
    }
}
{ package expr;		# pick up expressioins
    sub re {
	my	$self = shift;	# single instance is enough...
	local	*line = shift;
	undef	$ret;

	if ($line =~ /(^[^,]+)/) {
	    $self->{value} = $1;
	    $ret = $self;
	    $line = substr($line,@+[0]); $line =~ s/^\s+//;

	    $self->{value} =~ s/\.L/\$L/g if ($masm);
	}
	$ret;
    }
    sub out {
	my $self = shift;
	$self->{value};
    }
}
{ package directive;	# pick up directives, which start with .
    sub re {
	my	$self = shift;	# single instance is enough...
	local	*line = shift;
	undef	$ret;
	my	$dir;
	my	%opcode =	# lea 2f-1f(%rip),%dst; 1: nop; 2:
		(	"%rax"=>0x01058d48,	"%rcx"=>0x010d8d48,
			"%rdx"=>0x01158d48,	"%rbx"=>0x011d8d48,
			"%rsp"=>0x01258d48,	"%rbp"=>0x012d8d48,
			"%rsi"=>0x01358d48,	"%rdi"=>0x013d8d48,
			"%r8" =>0x01058d4c,	"%r9" =>0x010d8d4c,
			"%r10"=>0x01158d4c,	"%r11"=>0x011d8d4c,
			"%r12"=>0x01258d4c,	"%r13"=>0x012d8d4c,
			"%r14"=>0x01358d4c,	"%r15"=>0x013d8d4c	);

	if ($line =~ /^\s*(\.\w+)/) {
	    if (!$masm) {
		$self->{value} = $1;
		$line =~ s/\@abi\-omnipotent/\@function/;
		$line =~ s/\@function.*/\@function/;
		if ($line =~ /\.picmeup\s+(%r[\w]+)/i) {
		    $self->{value} = sprintf "\t.long\t0x%x,0x90000000",$opcode{$1};
		} elsif ($line =~ /\.asciz\s+"(.*)"$/) {
		    $self->{value} = ".byte\t".join(",",unpack("C*",$1),0);
		} elsif ($line =~ /\.extern/) {
		    $self->{value} = ""; # swallow extern
		} else {
		    $self->{value} = $line;
		}
		$line = "";
		return $self;
	    }

	    $dir = $1;
	    $ret = $self;
	    undef $self->{value};
	    $line = substr($line,@+[0]); $line =~ s/^\s+//;
	    SWITCH: for ($dir) {
		/\.(text)/
			    && do { my $v=undef;
				    $v="$current_segment\tENDS\n" if ($current_segment);
				    $current_segment = "_$1\$";
				    $current_segment =~ tr/[a-z]/[A-Z]/;
				    $v.="$current_segment\tSEGMENT ";
				    $v.=$masm>=$masmref ? "ALIGN(64)" : "PAGE";
				    $v.=" 'CODE'";
				    $self->{value} = $v;
				    last;
				  };
		/\.extern/  && do { $self->{value} = "EXTRN\t".$line.":BYTE"; last;  };
		/\.globl/   && do { $self->{value} = "PUBLIC\t".$line; last; };
		/\.type/    && do { ($sym,$type,$narg) = split(',',$line);
				    if ($type eq "\@function") {
					undef $current_function;
					$current_function->{name} = $sym;
					$current_function->{abi}  = "svr4";
					$current_function->{narg} = $narg;
				    } elsif ($type eq "\@abi-omnipotent") {
					undef $current_function;
					$current_function->{name} = $sym;
				    }
				    last;
				  };
		/\.size/    && do { if (defined($current_function)) {
					$self->{value}="$current_function->{name}\tENDP";
					undef $current_function;
				    }
				    last;
				  };
		/\.align/   && do { $self->{value} = "ALIGN\t".$line; last; };
		/\.(byte|value|long|quad)/
			    && do { my @arr = split(',',$line);
				    my $sz  = substr($1,0,1);
				    my $last = pop(@arr);
				    my $conv = sub  {	my $var=shift;
							if ($var=~s/0x([0-9a-f]+)/0$1h/i) { $var; }
							else { sprintf"0%Xh",$var; }
						    };  

				    $sz =~ tr/bvlq/BWDQ/;
				    $self->{value} = "\tD$sz\t";
				    for (@arr) { $self->{value} .= &$conv($_).","; }
				    $self->{value} .= &$conv($last);
				    last;
				  };
		/\.picmeup/ && do { $self->{value} = sprintf"\tDD\t 0%Xh,090000000h",$opcode{$line};
				    last;
				  };
		/\.asciz/   && do { if ($line =~ /^"(.*)"$/) {
					my @str=unpack("C*",$1);
					push @str,0;
					while ($#str>15) {
					    $self->{value}.="DB\t"
						.join(",",@str[0..15])."\n";
					    foreach (0..15) { shift @str; }
					}
					$self->{value}.="DB\t"
						.join(",",@str) if (@str);
				    }
				    last;
				  };
	    }
	    $line = "";
	}

	$ret;
    }
    sub out {
	my $self = shift;
	$self->{value};
    }
}

while($line=<>) {

    chomp($line);

    $line =~ s|[#!].*$||;	# get rid of asm-style comments...
    $line =~ s|/\*.*\*/||;	# ... and C-style comments...
    $line =~ s|^\s+||;		# ... and skip white spaces in beginning

    undef $label;
    undef $opcode;
    undef $dst;
    undef $src;
    undef $sz;

    if ($label=label->re(\$line))	{ print $label->out(); }

    if (directive->re(\$line)) {
	printf "%s",directive->out();
    } elsif ($opcode=opcode->re(\$line)) { ARGUMENT: {

	if ($src=register->re(\$line))	{ opcode->size($src->size()); }
	elsif ($src=const->re(\$line))	{ }
	elsif ($src=ea->re(\$line))	{ }
	elsif ($src=expr->re(\$line))	{ }

	last ARGUMENT if ($line !~ /^,/);

	$line = substr($line,1); $line =~ s/^\s+//;

	if ($dst=register->re(\$line))	{ opcode->size($dst->size()); }
	elsif ($dst=const->re(\$line))	{ }
	elsif ($dst=ea->re(\$line))	{ }

	} # ARGUMENT:

	$sz=opcode->size();

	if (defined($dst)) {
	    if (!$masm) {
		printf "\t%s\t%s,%s",	$opcode->out($dst->size()),
					$src->out($sz),$dst->out($sz);
	    } else {
		printf "\t%s\t%s,%s",	$opcode->out(),
					$dst->out($sz),$src->out($sz);
	    }
	} elsif (defined($src)) {
	    printf "\t%s\t%s",$opcode->out(),$src->out($sz);
	} else {
	    printf "\t%s",$opcode->out();
	}
    }

    print $line,"\n";
}

print "\n$current_segment\tENDS\nEND\n" if ($masm);

close STDOUT;

#################################################
# Cross-reference x86_64 ABI "card"
#
# 		Unix		Win64
# %rax		*		*
# %rbx		-		-
# %rcx		#4		#1
# %rdx		#3		#2
# %rsi		#2		-
# %rdi		#1		-
# %rbp		-		-
# %rsp		-		-
# %r8		#5		#3
# %r9		#6		#4
# %r10		*		*
# %r11		*		*
# %r12		-		-
# %r13		-		-
# %r14		-		-
# %r15		-		-
# 
# (*)	volatile register
# (-)	preserved by callee
# (#)	Nth argument, volatile
#
# In Unix terms top of stack is argument transfer area for arguments
# which could not be accomodated in registers. Or in other words 7th
# [integer] argument resides at 8(%rsp) upon function entry point.
# 128 bytes above %rsp constitute a "red zone" which is not touched
# by signal handlers and can be used as temporal storage without
# allocating a frame.
#
# In Win64 terms N*8 bytes on top of stack is argument transfer area,
# which belongs to/can be overwritten by callee. N is the number of
# arguments passed to callee, *but* not less than 4! This means that
# upon function entry point 5th argument resides at 40(%rsp), as well
# as that 32 bytes from 8(%rsp) can always be used as temporal
# storage [without allocating a frame]. One can actually argue that
# one can assume a "red zone" above stack pointer under Win64 as well.
# Point is that at apparently no occasion Windows kernel would alter
# the area above user stack pointer in true asynchronous manner...
#
# All the above means that if assembler programmer adheres to Unix
# register and stack layout, but disregards the "red zone" existense,
# it's possible to use following prologue and epilogue to "gear" from
# Unix to Win64 ABI in leaf functions with not more than 6 arguments.
#
# omnipotent_function:
# ifdef WIN64
#	movq	%rdi,8(%rsp)
#	movq	%rsi,16(%rsp)
#	movq	%rcx,%rdi	; if 1st argument is actually present
#	movq	%rdx,%rsi	; if 2nd argument is actually ...
#	movq	%r8,%rdx	; if 3rd argument is ...
#	movq	%r9,%rcx	; if 4th argument ...
#	movq	40(%rsp),%r8	; if 5th ...
#	movq	48(%rsp),%r9	; if 6th ...
# endif
#	...
# ifdef WIN64
#	movq	8(%rsp),%rdi
#	movq	16(%rsp),%rsi
# endif
#	ret