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path: root/openssl/crypto/perlasm/x86_64-xlate.pl
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Diffstat (limited to 'openssl/crypto/perlasm/x86_64-xlate.pl')
-rwxr-xr-xopenssl/crypto/perlasm/x86_64-xlate.pl917
1 files changed, 0 insertions, 917 deletions
diff --git a/openssl/crypto/perlasm/x86_64-xlate.pl b/openssl/crypto/perlasm/x86_64-xlate.pl
deleted file mode 100755
index e47116b7..00000000
--- a/openssl/crypto/perlasm/x86_64-xlate.pl
+++ /dev/null
@@ -1,917 +0,0 @@
-#!/usr/bin/env perl
-
-# Ascetic x86_64 AT&T to MASM/NASM assembler translator by <appro>.
-#
-# Why AT&T to MASM and not vice versa? Several reasons. Because AT&T
-# format is way easier to parse. Because it's simpler to "gear" from
-# Unix ABI to Windows one [see cross-reference "card" at the end of
-# file]. Because Linux targets were available first...
-#
-# In addition the script also "distills" code suitable for GNU
-# assembler, so that it can be compiled with more rigid assemblers,
-# such as Solaris /usr/ccs/bin/as.
-#
-# This translator is not designed to convert *arbitrary* assembler
-# code from AT&T format to MASM one. It's designed to convert just
-# enough to provide for dual-ABI OpenSSL modules development...
-# There *are* limitations and you might have to modify your assembler
-# code or this script to achieve the desired result...
-#
-# Currently recognized limitations:
-#
-# - can't use multiple ops per line;
-#
-# Dual-ABI styling rules.
-#
-# 1. Adhere to Unix register and stack layout [see cross-reference
-# ABI "card" at the end for explanation].
-# 2. Forget about "red zone," stick to more traditional blended
-# stack frame allocation. If volatile storage is actually required
-# that is. If not, just leave the stack as is.
-# 3. Functions tagged with ".type name,@function" get crafted with
-# unified Win64 prologue and epilogue automatically. If you want
-# to take care of ABI differences yourself, tag functions as
-# ".type name,@abi-omnipotent" instead.
-# 4. To optimize the Win64 prologue you can specify number of input
-# arguments as ".type name,@function,N." Keep in mind that if N is
-# larger than 6, then you *have to* write "abi-omnipotent" code,
-# because >6 cases can't be addressed with unified prologue.
-# 5. Name local labels as .L*, do *not* use dynamic labels such as 1:
-# (sorry about latter).
-# 6. Don't use [or hand-code with .byte] "rep ret." "ret" mnemonic is
-# required to identify the spots, where to inject Win64 epilogue!
-# But on the pros, it's then prefixed with rep automatically:-)
-# 7. Stick to explicit ip-relative addressing. If you have to use
-# GOTPCREL addressing, stick to mov symbol@GOTPCREL(%rip),%r??.
-# Both are recognized and translated to proper Win64 addressing
-# modes. To support legacy code a synthetic directive, .picmeup,
-# is implemented. It puts address of the *next* instruction into
-# target register, e.g.:
-#
-# .picmeup %rax
-# lea .Label-.(%rax),%rax
-#
-# 8. In order to provide for structured exception handling unified
-# Win64 prologue copies %rsp value to %rax. For further details
-# see SEH paragraph at the end.
-# 9. .init segment is allowed to contain calls to functions only.
-# a. If function accepts more than 4 arguments *and* >4th argument
-# is declared as non 64-bit value, do clear its upper part.
-
-my $flavour = shift;
-my $output = shift;
-if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
-
-{ my ($stddev,$stdino,@junk)=stat(STDOUT);
- my ($outdev,$outino,@junk)=stat($output);
-
- open STDOUT,">$output" || die "can't open $output: $!"
- if ($stddev!=$outdev || $stdino!=$outino);
-}
-
-my $gas=1; $gas=0 if ($output =~ /\.asm$/);
-my $elf=1; $elf=0 if (!$gas);
-my $win64=0;
-my $prefix="";
-my $decor=".L";
-
-my $masmref=8 + 50727*2**-32; # 8.00.50727 shipped with VS2005
-my $masm=0;
-my $PTR=" PTR";
-
-my $nasmref=2.03;
-my $nasm=0;
-
-if ($flavour eq "mingw64") { $gas=1; $elf=0; $win64=1;
- $prefix=`echo __USER_LABEL_PREFIX__ | $ENV{CC} -E -P -`;
- chomp($prefix);
- }
-elsif ($flavour eq "macosx") { $gas=1; $elf=0; $prefix="_"; $decor="L\$"; }
-elsif ($flavour eq "masm") { $gas=0; $elf=0; $masm=$masmref; $win64=1; $decor="\$L\$"; }
-elsif ($flavour eq "nasm") { $gas=0; $elf=0; $nasm=$nasmref; $win64=1; $decor="\$L\$"; $PTR=""; }
-elsif (!$gas)
-{ if ($ENV{ASM} =~ m/nasm/ && `nasm -v` =~ m/version ([0-9]+)\.([0-9]+)/i)
- { $nasm = $1 + $2*0.01; $PTR=""; }
- elsif (`ml64 2>&1` =~ m/Version ([0-9]+)\.([0-9]+)(\.([0-9]+))?/)
- { $masm = $1 + $2*2**-16 + $4*2**-32; }
- die "no assembler found on %PATH" if (!($nasm || $masm));
- $win64=1;
- $elf=0;
- $decor="\$L\$";
-}
-
-my $current_segment;
-my $current_function;
-my %globals;
-
-{ package opcode; # pick up opcodes
- sub re {
- my $self = shift; # single instance in enough...
- local *line = shift;
- undef $ret;
-
- if ($line =~ /^([a-z][a-z0-9]*)/i) {
- $self->{op} = $1;
- $ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
-
- undef $self->{sz};
- if ($self->{op} =~ /^(movz)b.*/) { # movz is pain...
- $self->{op} = $1;
- $self->{sz} = "b";
- } elsif ($self->{op} =~ /call|jmp/) {
- $self->{sz} = "";
- } elsif ($self->{op} =~ /^p/ && $' !~ /^(ush|op)/) { # SSEn
- $self->{sz} = "";
- } elsif ($self->{op} =~ /([a-z]{3,})([qlwb])$/) {
- $self->{op} = $1;
- $self->{sz} = $2;
- }
- }
- $ret;
- }
- sub size {
- my $self = shift;
- my $sz = shift;
- $self->{sz} = $sz if (defined($sz) && !defined($self->{sz}));
- $self->{sz};
- }
- sub out {
- my $self = shift;
- if ($gas) {
- if ($self->{op} eq "movz") { # movz is pain...
- sprintf "%s%s%s",$self->{op},$self->{sz},shift;
- } elsif ($self->{op} =~ /^set/) {
- "$self->{op}";
- } elsif ($self->{op} eq "ret") {
- my $epilogue = "";
- if ($win64 && $current_function->{abi} eq "svr4") {
- $epilogue = "movq 8(%rsp),%rdi\n\t" .
- "movq 16(%rsp),%rsi\n\t";
- }
- $epilogue . ".byte 0xf3,0xc3";
- } elsif ($self->{op} eq "call" && !$elf && $current_segment eq ".init") {
- ".p2align\t3\n\t.quad";
- } else {
- "$self->{op}$self->{sz}";
- }
- } else {
- $self->{op} =~ s/^movz/movzx/;
- if ($self->{op} eq "ret") {
- $self->{op} = "";
- if ($win64 && $current_function->{abi} eq "svr4") {
- $self->{op} = "mov rdi,QWORD${PTR}[8+rsp]\t;WIN64 epilogue\n\t".
- "mov rsi,QWORD${PTR}[16+rsp]\n\t";
- }
- $self->{op} .= "DB\t0F3h,0C3h\t\t;repret";
- } elsif ($self->{op} =~ /^(pop|push)f/) {
- $self->{op} .= $self->{sz};
- } elsif ($self->{op} eq "call" && $current_segment eq ".CRT\$XCU") {
- $self->{op} = "\tDQ";
- }
- $self->{op};
- }
- }
- sub mnemonic {
- my $self=shift;
- my $op=shift;
- $self->{op}=$op if (defined($op));
- $self->{op};
- }
-}
-{ package const; # pick up constants, which start with $
- sub re {
- my $self = shift; # single instance in enough...
- local *line = shift;
- undef $ret;
-
- if ($line =~ /^\$([^,]+)/) {
- $self->{value} = $1;
- $ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
- }
- $ret;
- }
- sub out {
- my $self = shift;
-
- if ($gas) {
- # Solaris /usr/ccs/bin/as can't handle multiplications
- # in $self->{value}
- $self->{value} =~ s/(?<![\w\$\.])(0x?[0-9a-f]+)/oct($1)/egi;
- $self->{value} =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg;
- sprintf "\$%s",$self->{value};
- } else {
- $self->{value} =~ s/(0b[0-1]+)/oct($1)/eig;
- $self->{value} =~ s/0x([0-9a-f]+)/0$1h/ig if ($masm);
- sprintf "%s",$self->{value};
- }
- }
-}
-{ package ea; # pick up effective addresses: expr(%reg,%reg,scale)
- sub re {
- my $self = shift; # single instance in enough...
- local *line = shift;
- undef $ret;
-
- # optional * ---vvv--- appears in indirect jmp/call
- if ($line =~ /^(\*?)([^\(,]*)\(([%\w,]+)\)/) {
- $self->{asterisk} = $1;
- $self->{label} = $2;
- ($self->{base},$self->{index},$self->{scale})=split(/,/,$3);
- $self->{scale} = 1 if (!defined($self->{scale}));
- $ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
-
- if ($win64 && $self->{label} =~ s/\@GOTPCREL//) {
- die if (opcode->mnemonic() ne "mov");
- opcode->mnemonic("lea");
- }
- $self->{base} =~ s/^%//;
- $self->{index} =~ s/^%// if (defined($self->{index}));
- }
- $ret;
- }
- sub size {}
- sub out {
- my $self = shift;
- my $sz = shift;
-
- $self->{label} =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
- $self->{label} =~ s/\.L/$decor/g;
-
- # Silently convert all EAs to 64-bit. This is required for
- # elder GNU assembler and results in more compact code,
- # *but* most importantly AES module depends on this feature!
- $self->{index} =~ s/^[er](.?[0-9xpi])[d]?$/r\1/;
- $self->{base} =~ s/^[er](.?[0-9xpi])[d]?$/r\1/;
-
- if ($gas) {
- # Solaris /usr/ccs/bin/as can't handle multiplications
- # in $self->{label}, new gas requires sign extension...
- use integer;
- $self->{label} =~ s/(?<![\w\$\.])(0x?[0-9a-f]+)/oct($1)/egi;
- $self->{label} =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg;
- $self->{label} =~ s/([0-9]+)/$1<<32>>32/eg;
- $self->{label} =~ s/^___imp_/__imp__/ if ($flavour eq "mingw64");
-
- if (defined($self->{index})) {
- sprintf "%s%s(%%%s,%%%s,%d)",$self->{asterisk},
- $self->{label},$self->{base},
- $self->{index},$self->{scale};
- } else {
- sprintf "%s%s(%%%s)", $self->{asterisk},$self->{label},$self->{base};
- }
- } else {
- %szmap = ( b=>"BYTE$PTR", w=>"WORD$PTR", l=>"DWORD$PTR", q=>"QWORD$PTR" );
-
- $self->{label} =~ s/\./\$/g;
- $self->{label} =~ s/(?<![\w\$\.])0x([0-9a-f]+)/0$1h/ig;
- $self->{label} = "($self->{label})" if ($self->{label} =~ /[\*\+\-\/]/);
- $sz="q" if ($self->{asterisk});
-
- if (defined($self->{index})) {
- sprintf "%s[%s%s*%d+%s]",$szmap{$sz},
- $self->{label}?"$self->{label}+":"",
- $self->{index},$self->{scale},
- $self->{base};
- } elsif ($self->{base} eq "rip") {
- sprintf "%s[%s]",$szmap{$sz},$self->{label};
- } else {
- sprintf "%s[%s%s]",$szmap{$sz},
- $self->{label}?"$self->{label}+":"",
- $self->{base};
- }
- }
- }
-}
-{ package register; # pick up registers, which start with %.
- sub re {
- my $class = shift; # muliple instances...
- my $self = {};
- local *line = shift;
- undef $ret;
-
- # optional * ---vvv--- appears in indirect jmp/call
- if ($line =~ /^(\*?)%(\w+)/) {
- bless $self,$class;
- $self->{asterisk} = $1;
- $self->{value} = $2;
- $ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
- }
- $ret;
- }
- sub size {
- my $self = shift;
- undef $ret;
-
- if ($self->{value} =~ /^r[\d]+b$/i) { $ret="b"; }
- elsif ($self->{value} =~ /^r[\d]+w$/i) { $ret="w"; }
- elsif ($self->{value} =~ /^r[\d]+d$/i) { $ret="l"; }
- elsif ($self->{value} =~ /^r[\w]+$/i) { $ret="q"; }
- elsif ($self->{value} =~ /^[a-d][hl]$/i){ $ret="b"; }
- elsif ($self->{value} =~ /^[\w]{2}l$/i) { $ret="b"; }
- elsif ($self->{value} =~ /^[\w]{2}$/i) { $ret="w"; }
- elsif ($self->{value} =~ /^e[a-z]{2}$/i){ $ret="l"; }
-
- $ret;
- }
- sub out {
- my $self = shift;
- if ($gas) { sprintf "%s%%%s",$self->{asterisk},$self->{value}; }
- else { $self->{value}; }
- }
-}
-{ package label; # pick up labels, which end with :
- sub re {
- my $self = shift; # single instance is enough...
- local *line = shift;
- undef $ret;
-
- if ($line =~ /(^[\.\w]+)\:/) {
- $self->{value} = $1;
- $ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
-
- $self->{value} =~ s/^\.L/$decor/;
- }
- $ret;
- }
- sub out {
- my $self = shift;
-
- if ($gas) {
- my $func = ($globals{$self->{value}} or $self->{value}) . ":";
- if ($win64 &&
- $current_function->{name} eq $self->{value} &&
- $current_function->{abi} eq "svr4") {
- $func .= "\n";
- $func .= " movq %rdi,8(%rsp)\n";
- $func .= " movq %rsi,16(%rsp)\n";
- $func .= " movq %rsp,%rax\n";
- $func .= "${decor}SEH_begin_$current_function->{name}:\n";
- my $narg = $current_function->{narg};
- $narg=6 if (!defined($narg));
- $func .= " movq %rcx,%rdi\n" if ($narg>0);
- $func .= " movq %rdx,%rsi\n" if ($narg>1);
- $func .= " movq %r8,%rdx\n" if ($narg>2);
- $func .= " movq %r9,%rcx\n" if ($narg>3);
- $func .= " movq 40(%rsp),%r8\n" if ($narg>4);
- $func .= " movq 48(%rsp),%r9\n" if ($narg>5);
- }
- $func;
- } elsif ($self->{value} ne "$current_function->{name}") {
- $self->{value} .= ":" if ($masm && $ret!~m/^\$/);
- $self->{value} . ":";
- } elsif ($win64 && $current_function->{abi} eq "svr4") {
- my $func = "$current_function->{name}" .
- ($nasm ? ":" : "\tPROC $current_function->{scope}") .
- "\n";
- $func .= " mov QWORD${PTR}[8+rsp],rdi\t;WIN64 prologue\n";
- $func .= " mov QWORD${PTR}[16+rsp],rsi\n";
- $func .= " mov rax,rsp\n";
- $func .= "${decor}SEH_begin_$current_function->{name}:";
- $func .= ":" if ($masm);
- $func .= "\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}".
- ($nasm ? ":" : "\tPROC $current_function->{scope}");
- }
- }
-}
-{ 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+//;
-
- $self->{value} =~ s/\@PLT// if (!$elf);
- $self->{value} =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
- $self->{value} =~ s/\.L/$decor/g;
- }
- $ret;
- }
- sub out {
- my $self = shift;
- if ($nasm && opcode->mnemonic()=~m/^j/) {
- "NEAR ".$self->{value};
- } else {
- $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+)/) {
- $dir = $1;
- $ret = $self;
- undef $self->{value};
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
-
- SWITCH: for ($dir) {
- /\.picmeup/ && do { if ($line =~ /(%r[\w]+)/i) {
- $dir="\t.long";
- $line=sprintf "0x%x,0x90000000",$opcode{$1};
- }
- last;
- };
- /\.global|\.globl|\.extern/
- && do { $globals{$line} = $prefix . $line;
- $line = $globals{$line} if ($prefix);
- last;
- };
- /\.type/ && do { ($sym,$type,$narg) = split(',',$line);
- if ($type eq "\@function") {
- undef $current_function;
- $current_function->{name} = $sym;
- $current_function->{abi} = "svr4";
- $current_function->{narg} = $narg;
- $current_function->{scope} = defined($globals{$sym})?"PUBLIC":"PRIVATE";
- } elsif ($type eq "\@abi-omnipotent") {
- undef $current_function;
- $current_function->{name} = $sym;
- $current_function->{scope} = defined($globals{$sym})?"PUBLIC":"PRIVATE";
- }
- $line =~ s/\@abi\-omnipotent/\@function/;
- $line =~ s/\@function.*/\@function/;
- last;
- };
- /\.asciz/ && do { if ($line =~ /^"(.*)"$/) {
- $dir = ".byte";
- $line = join(",",unpack("C*",$1),0);
- }
- last;
- };
- /\.rva|\.long|\.quad/
- && do { $line =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
- $line =~ s/\.L/$decor/g;
- last;
- };
- }
-
- if ($gas) {
- $self->{value} = $dir . "\t" . $line;
-
- if ($dir =~ /\.extern/) {
- $self->{value} = ""; # swallow extern
- } elsif (!$elf && $dir =~ /\.type/) {
- $self->{value} = "";
- $self->{value} = ".def\t" . ($globals{$1} or $1) . ";\t" .
- (defined($globals{$1})?".scl 2;":".scl 3;") .
- "\t.type 32;\t.endef"
- if ($win64 && $line =~ /([^,]+),\@function/);
- } elsif (!$elf && $dir =~ /\.size/) {
- $self->{value} = "";
- if (defined($current_function)) {
- $self->{value} .= "${decor}SEH_end_$current_function->{name}:"
- if ($win64 && $current_function->{abi} eq "svr4");
- undef $current_function;
- }
- } elsif (!$elf && $dir =~ /\.align/) {
- $self->{value} = ".p2align\t" . (log($line)/log(2));
- } elsif ($dir eq ".section") {
- $current_segment=$line;
- if (!$elf && $current_segment eq ".init") {
- if ($flavour eq "macosx") { $self->{value} = ".mod_init_func"; }
- elsif ($flavour eq "mingw64") { $self->{value} = ".section\t.ctors"; }
- }
- } elsif ($dir =~ /\.(text|data)/) {
- $current_segment=".$1";
- }
- $line = "";
- return $self;
- }
-
- # non-gas case or nasm/masm
- SWITCH: for ($dir) {
- /\.text/ && do { my $v=undef;
- if ($nasm) {
- $v="section .text code align=64\n";
- } else {
- $v="$current_segment\tENDS\n" if ($current_segment);
- $current_segment = ".text\$";
- $v.="$current_segment\tSEGMENT ";
- $v.=$masm>=$masmref ? "ALIGN(64)" : "PAGE";
- $v.=" 'CODE'";
- }
- $self->{value} = $v;
- last;
- };
- /\.data/ && do { my $v=undef;
- if ($nasm) {
- $v="section .data data align=8\n";
- } else {
- $v="$current_segment\tENDS\n" if ($current_segment);
- $current_segment = "_DATA";
- $v.="$current_segment\tSEGMENT";
- }
- $self->{value} = $v;
- last;
- };
- /\.section/ && do { my $v=undef;
- $line =~ s/([^,]*).*/$1/;
- $line = ".CRT\$XCU" if ($line eq ".init");
- if ($nasm) {
- $v="section $line";
- if ($line=~/\.([px])data/) {
- $v.=" rdata align=";
- $v.=$1 eq "p"? 4 : 8;
- } elsif ($line=~/\.CRT\$/i) {
- $v.=" rdata align=8";
- }
- } else {
- $v="$current_segment\tENDS\n" if ($current_segment);
- $v.="$line\tSEGMENT";
- if ($line=~/\.([px])data/) {
- $v.=" READONLY";
- $v.=" ALIGN(".($1 eq "p" ? 4 : 8).")" if ($masm>=$masmref);
- } elsif ($line=~/\.CRT\$/i) {
- $v.=" READONLY DWORD";
- }
- }
- $current_segment = $line;
- $self->{value} = $v;
- last;
- };
- /\.extern/ && do { $self->{value} = "EXTERN\t".$line;
- $self->{value} .= ":NEAR" if ($masm);
- last;
- };
- /\.globl|.global/
- && do { $self->{value} = $masm?"PUBLIC":"global";
- $self->{value} .= "\t".$line;
- last;
- };
- /\.size/ && do { if (defined($current_function)) {
- undef $self->{value};
- if ($current_function->{abi} eq "svr4") {
- $self->{value}="${decor}SEH_end_$current_function->{name}:";
- $self->{value}.=":\n" if($masm);
- }
- $self->{value}.="$current_function->{name}\tENDP" if($masm);
- undef $current_function;
- }
- last;
- };
- /\.align/ && do { $self->{value} = "ALIGN\t".$line; last; };
- /\.(value|long|rva|quad)/
- && do { my $sz = substr($1,0,1);
- my @arr = split(/,\s*/,$line);
- my $last = pop(@arr);
- my $conv = sub { my $var=shift;
- $var=~s/^(0b[0-1]+)/oct($1)/eig;
- $var=~s/^0x([0-9a-f]+)/0$1h/ig if ($masm);
- if ($sz eq "D" && ($current_segment=~/.[px]data/ || $dir eq ".rva"))
- { $var=~s/([_a-z\$\@][_a-z0-9\$\@]*)/$nasm?"$1 wrt ..imagebase":"imagerel $1"/egi; }
- $var;
- };
-
- $sz =~ tr/bvlrq/BWDDQ/;
- $self->{value} = "\tD$sz\t";
- for (@arr) { $self->{value} .= &$conv($_).","; }
- $self->{value} .= &$conv($last);
- last;
- };
- /\.byte/ && do { my @str=split(/,\s*/,$line);
- map(s/(0b[0-1]+)/oct($1)/eig,@str);
- map(s/0x([0-9a-f]+)/0$1h/ig,@str) if ($masm);
- 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;
- $self->{value};
- }
-}
-
-if ($nasm) {
- print <<___;
-default rel
-___
-} elsif ($masm) {
- print <<___;
-OPTION DOTNAME
-___
-}
-while($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 $sz;
- undef @args;
-
- if ($label=label->re(\$line)) { print $label->out(); }
-
- if (directive->re(\$line)) {
- printf "%s",directive->out();
- } elsif ($opcode=opcode->re(\$line)) { ARGUMENT: while (1) {
- my $arg;
-
- if ($arg=register->re(\$line)) { opcode->size($arg->size()); }
- elsif ($arg=const->re(\$line)) { }
- elsif ($arg=ea->re(\$line)) { }
- elsif ($arg=expr->re(\$line)) { }
- else { last ARGUMENT; }
-
- push @args,$arg;
-
- last ARGUMENT if ($line !~ /^,/);
-
- $line =~ s/^,\s*//;
- } # ARGUMENT:
-
- $sz=opcode->size();
-
- if ($#args>=0) {
- my $insn;
- if ($gas) {
- $insn = $opcode->out($#args>=1?$args[$#args]->size():$sz);
- } else {
- $insn = $opcode->out();
- $insn .= $sz if (map($_->out() =~ /x?mm/,@args));
- @args = reverse(@args);
- undef $sz if ($nasm && $opcode->mnemonic() eq "lea");
- }
- printf "\t%s\t%s",$insn,join(",",map($_->out($sz),@args));
- } else {
- printf "\t%s",$opcode->out();
- }
- }
-
- print $line,"\n";
-}
-
-print "\n$current_segment\tENDS\n" if ($current_segment && $masm);
-print "END\n" if ($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
-#
- #################################################
-# Win64 SEH, Structured Exception Handling.
-#
-# Unlike on Unix systems(*) lack of Win64 stack unwinding information
-# has undesired side-effect at run-time: if an exception is raised in
-# assembler subroutine such as those in question (basically we're
-# referring to segmentation violations caused by malformed input
-# parameters), the application is briskly terminated without invoking
-# any exception handlers, most notably without generating memory dump
-# or any user notification whatsoever. This poses a problem. It's
-# possible to address it by registering custom language-specific
-# handler that would restore processor context to the state at
-# subroutine entry point and return "exception is not handled, keep
-# unwinding" code. Writing such handler can be a challenge... But it's
-# doable, though requires certain coding convention. Consider following
-# snippet:
-#
-# .type function,@function
-# function:
-# movq %rsp,%rax # copy rsp to volatile register
-# pushq %r15 # save non-volatile registers
-# pushq %rbx
-# pushq %rbp
-# movq %rsp,%r11
-# subq %rdi,%r11 # prepare [variable] stack frame
-# andq $-64,%r11
-# movq %rax,0(%r11) # check for exceptions
-# movq %r11,%rsp # allocate [variable] stack frame
-# movq %rax,0(%rsp) # save original rsp value
-# magic_point:
-# ...
-# movq 0(%rsp),%rcx # pull original rsp value
-# movq -24(%rcx),%rbp # restore non-volatile registers
-# movq -16(%rcx),%rbx
-# movq -8(%rcx),%r15
-# movq %rcx,%rsp # restore original rsp
-# ret
-# .size function,.-function
-#
-# The key is that up to magic_point copy of original rsp value remains
-# in chosen volatile register and no non-volatile register, except for
-# rsp, is modified. While past magic_point rsp remains constant till
-# the very end of the function. In this case custom language-specific
-# exception handler would look like this:
-#
-# EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
-# CONTEXT *context,DISPATCHER_CONTEXT *disp)
-# { ULONG64 *rsp = (ULONG64 *)context->Rax;
-# if (context->Rip >= magic_point)
-# { rsp = ((ULONG64 **)context->Rsp)[0];
-# context->Rbp = rsp[-3];
-# context->Rbx = rsp[-2];
-# context->R15 = rsp[-1];
-# }
-# context->Rsp = (ULONG64)rsp;
-# context->Rdi = rsp[1];
-# context->Rsi = rsp[2];
-#
-# memcpy (disp->ContextRecord,context,sizeof(CONTEXT));
-# RtlVirtualUnwind(UNW_FLAG_NHANDLER,disp->ImageBase,
-# dips->ControlPc,disp->FunctionEntry,disp->ContextRecord,
-# &disp->HandlerData,&disp->EstablisherFrame,NULL);
-# return ExceptionContinueSearch;
-# }
-#
-# It's appropriate to implement this handler in assembler, directly in
-# function's module. In order to do that one has to know members'
-# offsets in CONTEXT and DISPATCHER_CONTEXT structures and some constant
-# values. Here they are:
-#
-# CONTEXT.Rax 120
-# CONTEXT.Rcx 128
-# CONTEXT.Rdx 136
-# CONTEXT.Rbx 144
-# CONTEXT.Rsp 152
-# CONTEXT.Rbp 160
-# CONTEXT.Rsi 168
-# CONTEXT.Rdi 176
-# CONTEXT.R8 184
-# CONTEXT.R9 192
-# CONTEXT.R10 200
-# CONTEXT.R11 208
-# CONTEXT.R12 216
-# CONTEXT.R13 224
-# CONTEXT.R14 232
-# CONTEXT.R15 240
-# CONTEXT.Rip 248
-# CONTEXT.Xmm6 512
-# sizeof(CONTEXT) 1232
-# DISPATCHER_CONTEXT.ControlPc 0
-# DISPATCHER_CONTEXT.ImageBase 8
-# DISPATCHER_CONTEXT.FunctionEntry 16
-# DISPATCHER_CONTEXT.EstablisherFrame 24
-# DISPATCHER_CONTEXT.TargetIp 32
-# DISPATCHER_CONTEXT.ContextRecord 40
-# DISPATCHER_CONTEXT.LanguageHandler 48
-# DISPATCHER_CONTEXT.HandlerData 56
-# UNW_FLAG_NHANDLER 0
-# ExceptionContinueSearch 1
-#
-# In order to tie the handler to the function one has to compose
-# couple of structures: one for .xdata segment and one for .pdata.
-#
-# UNWIND_INFO structure for .xdata segment would be
-#
-# function_unwind_info:
-# .byte 9,0,0,0
-# .rva handler
-#
-# This structure designates exception handler for a function with
-# zero-length prologue, no stack frame or frame register.
-#
-# To facilitate composing of .pdata structures, auto-generated "gear"
-# prologue copies rsp value to rax and denotes next instruction with
-# .LSEH_begin_{function_name} label. This essentially defines the SEH
-# styling rule mentioned in the beginning. Position of this label is
-# chosen in such manner that possible exceptions raised in the "gear"
-# prologue would be accounted to caller and unwound from latter's frame.
-# End of function is marked with respective .LSEH_end_{function_name}
-# label. To summarize, .pdata segment would contain
-#
-# .rva .LSEH_begin_function
-# .rva .LSEH_end_function
-# .rva function_unwind_info
-#
-# Reference to functon_unwind_info from .xdata segment is the anchor.
-# In case you wonder why references are 32-bit .rvas and not 64-bit
-# .quads. References put into these two segments are required to be
-# *relative* to the base address of the current binary module, a.k.a.
-# image base. No Win64 module, be it .exe or .dll, can be larger than
-# 2GB and thus such relative references can be and are accommodated in
-# 32 bits.
-#
-# Having reviewed the example function code, one can argue that "movq
-# %rsp,%rax" above is redundant. It is not! Keep in mind that on Unix
-# rax would contain an undefined value. If this "offends" you, use
-# another register and refrain from modifying rax till magic_point is
-# reached, i.e. as if it was a non-volatile register. If more registers
-# are required prior [variable] frame setup is completed, note that
-# nobody says that you can have only one "magic point." You can
-# "liberate" non-volatile registers by denoting last stack off-load
-# instruction and reflecting it in finer grade unwind logic in handler.
-# After all, isn't it why it's called *language-specific* handler...
-#
-# Attentive reader can notice that exceptions would be mishandled in
-# auto-generated "gear" epilogue. Well, exception effectively can't
-# occur there, because if memory area used by it was subject to
-# segmentation violation, then it would be raised upon call to the
-# function (and as already mentioned be accounted to caller, which is
-# not a problem). If you're still not comfortable, then define tail
-# "magic point" just prior ret instruction and have handler treat it...
-#
-# (*) Note that we're talking about run-time, not debug-time. Lack of
-# unwind information makes debugging hard on both Windows and
-# Unix. "Unlike" referes to the fact that on Unix signal handler
-# will always be invoked, core dumped and appropriate exit code
-# returned to parent (for user notification).
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 05:22:48 +0000