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#!/opt/bin/perl |
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{ |
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package Coro::State; |
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use common::sense; |
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my @insn; |
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$insn[0][1] = "\x0f\xb6"; # movzbl mem -> rax |
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$insn[0][2] = "\x0f\xb7"; # movzwl mem -> rax |
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$insn[0][4] = "\x8b"; # movl mem -> rax |
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$insn[0][8] = "\x48\x8b"; # movq mem -> rax |
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$insn[1][1] = "\x88"; # movb al -> mem |
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$insn[1][2] = "\x66\x89"; # movw ax -> mem |
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$insn[1][4] = "\x89"; # movl eax -> mem |
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$insn[1][8] = "\x48\x89"; # movq rax -> mem |
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my $modrm_disp8 = 0x40; |
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my $modrm_disp32 = 0x80; |
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my $modrm_rsi = 0x06; |
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my $modrm_rdi = 0x07; |
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my @vars; |
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my $mov_ind = sub { |
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my ($size, $mod_rm, $store, $offset) = @_; |
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if ($offset < -128 || $offset > 127) { |
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$mod_rm |= $modrm_disp32; |
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$offset = pack "V", $offset; |
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} elsif ($offset) { |
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$mod_rm |= $modrm_disp8; |
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$offset = pack "c", $offset; |
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} else { |
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$offset = ""; |
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} |
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$insn[$store][$size] . (chr $mod_rm) . $offset |
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}; |
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my $gencopy = sub { |
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my ($save) = shift; |
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my $curbase = undef; |
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my $code; |
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my $curslot = 0; |
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for (@vars) { |
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my ($addr, $asize, $slot, $ssize) = @$_; |
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if (!defined $curbase || abs ($curbase - $addr) > 0x7ffffff) { |
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$curbase = $addr + 128; |
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$code .= "\x48\xbe" . pack "Q", $curbase; # mov imm64, %rsi |
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} |
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my $slotofs = $slot - $curslot; |
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# the sort ensures that this condition and adjustment suffices |
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if ($slotofs > 127) { |
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my $adj = 256; |
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$code .= "\x48\x81\xc7" . pack "i", $adj; # addq imm32, %rdi |
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$curslot += $adj; |
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$slotofs -= $adj; |
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} |
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if ($save) { |
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$code .= $mov_ind->($asize, $modrm_rsi, 0, $addr - $curbase); |
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$code .= $mov_ind->($ssize, $modrm_rdi, 1, $slotofs); |
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} else { |
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$code .= $mov_ind->($ssize, $modrm_rdi, 0, $slotofs); |
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$code .= $mov_ind->($asize, $modrm_rsi, 1, $addr - $curbase); |
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} |
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} |
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$code .= "\xc3"; # retq |
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$code |
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}; |
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sub _jit { |
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@vars = @_; |
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# sort all variables into 256 byte blocks, biased by -128 |
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# so gencopy can += 256 occasionally. within those blocks, |
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# sort by address so we can play further tricks. |
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@vars = sort { |
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(($a->[2] + 128) & ~255) <=> (($b->[2] + 128) & ~255) |
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or $a->[0] <=> $b->[0] |
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} @vars; |
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# we *could* combine adjacent vars, but this is not very common |
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my $load = $gencopy->(0); |
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my $save = $gencopy->(1); |
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#open my $fh, ">dat"; syswrite $fh, $save; system "objdump -b binary -m i386 -M x86-64 -D dat";#d# |
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#warn length $load;#d# |
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#warn length $save;#d# |
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($load, $save) |
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} |
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} |
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