forked from mia/Aegisub
837 lines
29 KiB
Lua
837 lines
29 KiB
Lua
----------------------------------------------------------------------------
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-- LuaJIT x86/x64 disassembler module.
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--
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-- Copyright (C) 2005-2017 Mike Pall. All rights reserved.
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-- Released under the MIT license. See Copyright Notice in luajit.h
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----------------------------------------------------------------------------
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-- This is a helper module used by the LuaJIT machine code dumper module.
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--
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-- Sending small code snippets to an external disassembler and mixing the
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-- output with our own stuff was too fragile. So I had to bite the bullet
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-- and write yet another x86 disassembler. Oh well ...
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--
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-- The output format is very similar to what ndisasm generates. But it has
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-- been developed independently by looking at the opcode tables from the
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-- Intel and AMD manuals. The supported instruction set is quite extensive
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-- and reflects what a current generation Intel or AMD CPU implements in
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-- 32 bit and 64 bit mode. Yes, this includes MMX, SSE, SSE2, SSE3, SSSE3,
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-- SSE4.1, SSE4.2, SSE4a and even privileged and hypervisor (VMX/SVM)
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-- instructions.
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--
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-- Notes:
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-- * The (useless) a16 prefix, 3DNow and pre-586 opcodes are unsupported.
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-- * No attempt at optimization has been made -- it's fast enough for my needs.
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-- * The public API may change when more architectures are added.
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------------------------------------------------------------------------------
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local type = type
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local sub, byte, format = string.sub, string.byte, string.format
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local match, gmatch, gsub = string.match, string.gmatch, string.gsub
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local lower, rep = string.lower, string.rep
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-- Map for 1st opcode byte in 32 bit mode. Ugly? Well ... read on.
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local map_opc1_32 = {
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--0x
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[0]="addBmr","addVmr","addBrm","addVrm","addBai","addVai","push es","pop es",
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"orBmr","orVmr","orBrm","orVrm","orBai","orVai","push cs","opc2*",
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--1x
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"adcBmr","adcVmr","adcBrm","adcVrm","adcBai","adcVai","push ss","pop ss",
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"sbbBmr","sbbVmr","sbbBrm","sbbVrm","sbbBai","sbbVai","push ds","pop ds",
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--2x
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"andBmr","andVmr","andBrm","andVrm","andBai","andVai","es:seg","daa",
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"subBmr","subVmr","subBrm","subVrm","subBai","subVai","cs:seg","das",
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--3x
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"xorBmr","xorVmr","xorBrm","xorVrm","xorBai","xorVai","ss:seg","aaa",
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"cmpBmr","cmpVmr","cmpBrm","cmpVrm","cmpBai","cmpVai","ds:seg","aas",
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--4x
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"incVR","incVR","incVR","incVR","incVR","incVR","incVR","incVR",
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"decVR","decVR","decVR","decVR","decVR","decVR","decVR","decVR",
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--5x
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"pushUR","pushUR","pushUR","pushUR","pushUR","pushUR","pushUR","pushUR",
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"popUR","popUR","popUR","popUR","popUR","popUR","popUR","popUR",
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--6x
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"sz*pushaw,pusha","sz*popaw,popa","boundVrm","arplWmr",
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"fs:seg","gs:seg","o16:","a16",
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"pushUi","imulVrmi","pushBs","imulVrms",
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"insb","insVS","outsb","outsVS",
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--7x
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"joBj","jnoBj","jbBj","jnbBj","jzBj","jnzBj","jbeBj","jaBj",
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"jsBj","jnsBj","jpeBj","jpoBj","jlBj","jgeBj","jleBj","jgBj",
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--8x
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"arith!Bmi","arith!Vmi","arith!Bmi","arith!Vms",
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"testBmr","testVmr","xchgBrm","xchgVrm",
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"movBmr","movVmr","movBrm","movVrm",
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"movVmg","leaVrm","movWgm","popUm",
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--9x
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"nop*xchgVaR|pause|xchgWaR|repne nop","xchgVaR","xchgVaR","xchgVaR",
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"xchgVaR","xchgVaR","xchgVaR","xchgVaR",
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"sz*cbw,cwde,cdqe","sz*cwd,cdq,cqo","call farViw","wait",
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"sz*pushfw,pushf","sz*popfw,popf","sahf","lahf",
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--Ax
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"movBao","movVao","movBoa","movVoa",
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"movsb","movsVS","cmpsb","cmpsVS",
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"testBai","testVai","stosb","stosVS",
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"lodsb","lodsVS","scasb","scasVS",
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--Bx
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"movBRi","movBRi","movBRi","movBRi","movBRi","movBRi","movBRi","movBRi",
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"movVRI","movVRI","movVRI","movVRI","movVRI","movVRI","movVRI","movVRI",
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--Cx
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"shift!Bmu","shift!Vmu","retBw","ret","$lesVrm","$ldsVrm","movBmi","movVmi",
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"enterBwu","leave","retfBw","retf","int3","intBu","into","iretVS",
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--Dx
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"shift!Bm1","shift!Vm1","shift!Bmc","shift!Vmc","aamBu","aadBu","salc","xlatb",
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"fp*0","fp*1","fp*2","fp*3","fp*4","fp*5","fp*6","fp*7",
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--Ex
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"loopneBj","loopeBj","loopBj","sz*jcxzBj,jecxzBj,jrcxzBj",
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"inBau","inVau","outBua","outVua",
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"callVj","jmpVj","jmp farViw","jmpBj","inBad","inVad","outBda","outVda",
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--Fx
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"lock:","int1","repne:rep","rep:","hlt","cmc","testb!Bm","testv!Vm",
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"clc","stc","cli","sti","cld","std","incb!Bm","incd!Vm",
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}
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assert(#map_opc1_32 == 255)
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-- Map for 1st opcode byte in 64 bit mode (overrides only).
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local map_opc1_64 = setmetatable({
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[0x06]=false, [0x07]=false, [0x0e]=false,
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[0x16]=false, [0x17]=false, [0x1e]=false, [0x1f]=false,
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[0x27]=false, [0x2f]=false, [0x37]=false, [0x3f]=false,
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[0x60]=false, [0x61]=false, [0x62]=false, [0x63]="movsxdVrDmt", [0x67]="a32:",
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[0x40]="rex*", [0x41]="rex*b", [0x42]="rex*x", [0x43]="rex*xb",
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[0x44]="rex*r", [0x45]="rex*rb", [0x46]="rex*rx", [0x47]="rex*rxb",
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[0x48]="rex*w", [0x49]="rex*wb", [0x4a]="rex*wx", [0x4b]="rex*wxb",
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[0x4c]="rex*wr", [0x4d]="rex*wrb", [0x4e]="rex*wrx", [0x4f]="rex*wrxb",
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[0x82]=false, [0x9a]=false, [0xc4]=false, [0xc5]=false, [0xce]=false,
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[0xd4]=false, [0xd5]=false, [0xd6]=false, [0xea]=false,
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}, { __index = map_opc1_32 })
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-- Map for 2nd opcode byte (0F xx). True CISC hell. Hey, I told you.
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-- Prefix dependent MMX/SSE opcodes: (none)|rep|o16|repne, -|F3|66|F2
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local map_opc2 = {
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--0x
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[0]="sldt!Dmp","sgdt!Ump","larVrm","lslVrm",nil,"syscall","clts","sysret",
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"invd","wbinvd",nil,"ud1",nil,"$prefetch!Bm","femms","3dnowMrmu",
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--1x
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"movupsXrm|movssXrm|movupdXrm|movsdXrm",
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"movupsXmr|movssXmr|movupdXmr|movsdXmr",
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"movhlpsXrm$movlpsXrm|movsldupXrm|movlpdXrm|movddupXrm",
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"movlpsXmr||movlpdXmr",
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"unpcklpsXrm||unpcklpdXrm",
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"unpckhpsXrm||unpckhpdXrm",
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"movlhpsXrm$movhpsXrm|movshdupXrm|movhpdXrm",
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"movhpsXmr||movhpdXmr",
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"$prefetcht!Bm","hintnopVm","hintnopVm","hintnopVm",
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"hintnopVm","hintnopVm","hintnopVm","hintnopVm",
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--2x
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"movUmx$","movUmy$","movUxm$","movUym$","movUmz$",nil,"movUzm$",nil,
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"movapsXrm||movapdXrm",
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"movapsXmr||movapdXmr",
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"cvtpi2psXrMm|cvtsi2ssXrVmt|cvtpi2pdXrMm|cvtsi2sdXrVmt",
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"movntpsXmr|movntssXmr|movntpdXmr|movntsdXmr",
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"cvttps2piMrXm|cvttss2siVrXm|cvttpd2piMrXm|cvttsd2siVrXm",
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"cvtps2piMrXm|cvtss2siVrXm|cvtpd2piMrXm|cvtsd2siVrXm",
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"ucomissXrm||ucomisdXrm",
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"comissXrm||comisdXrm",
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--3x
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"wrmsr","rdtsc","rdmsr","rdpmc","sysenter","sysexit",nil,"getsec",
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"opc3*38",nil,"opc3*3a",nil,nil,nil,nil,nil,
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--4x
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"cmovoVrm","cmovnoVrm","cmovbVrm","cmovnbVrm",
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"cmovzVrm","cmovnzVrm","cmovbeVrm","cmovaVrm",
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"cmovsVrm","cmovnsVrm","cmovpeVrm","cmovpoVrm",
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"cmovlVrm","cmovgeVrm","cmovleVrm","cmovgVrm",
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--5x
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"movmskpsVrXm$||movmskpdVrXm$","sqrtpsXrm|sqrtssXrm|sqrtpdXrm|sqrtsdXrm",
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"rsqrtpsXrm|rsqrtssXrm","rcppsXrm|rcpssXrm",
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"andpsXrm||andpdXrm","andnpsXrm||andnpdXrm",
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"orpsXrm||orpdXrm","xorpsXrm||xorpdXrm",
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"addpsXrm|addssXrm|addpdXrm|addsdXrm","mulpsXrm|mulssXrm|mulpdXrm|mulsdXrm",
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"cvtps2pdXrm|cvtss2sdXrm|cvtpd2psXrm|cvtsd2ssXrm",
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"cvtdq2psXrm|cvttps2dqXrm|cvtps2dqXrm",
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"subpsXrm|subssXrm|subpdXrm|subsdXrm","minpsXrm|minssXrm|minpdXrm|minsdXrm",
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"divpsXrm|divssXrm|divpdXrm|divsdXrm","maxpsXrm|maxssXrm|maxpdXrm|maxsdXrm",
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--6x
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"punpcklbwPrm","punpcklwdPrm","punpckldqPrm","packsswbPrm",
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"pcmpgtbPrm","pcmpgtwPrm","pcmpgtdPrm","packuswbPrm",
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"punpckhbwPrm","punpckhwdPrm","punpckhdqPrm","packssdwPrm",
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"||punpcklqdqXrm","||punpckhqdqXrm",
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"movPrVSm","movqMrm|movdquXrm|movdqaXrm",
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--7x
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"pshufwMrmu|pshufhwXrmu|pshufdXrmu|pshuflwXrmu","pshiftw!Pmu",
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"pshiftd!Pmu","pshiftq!Mmu||pshiftdq!Xmu",
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"pcmpeqbPrm","pcmpeqwPrm","pcmpeqdPrm","emms|",
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"vmreadUmr||extrqXmuu$|insertqXrmuu$","vmwriteUrm||extrqXrm$|insertqXrm$",
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nil,nil,
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"||haddpdXrm|haddpsXrm","||hsubpdXrm|hsubpsXrm",
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"movVSmMr|movqXrm|movVSmXr","movqMmr|movdquXmr|movdqaXmr",
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--8x
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"joVj","jnoVj","jbVj","jnbVj","jzVj","jnzVj","jbeVj","jaVj",
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"jsVj","jnsVj","jpeVj","jpoVj","jlVj","jgeVj","jleVj","jgVj",
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--9x
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"setoBm","setnoBm","setbBm","setnbBm","setzBm","setnzBm","setbeBm","setaBm",
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"setsBm","setnsBm","setpeBm","setpoBm","setlBm","setgeBm","setleBm","setgBm",
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--Ax
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"push fs","pop fs","cpuid","btVmr","shldVmru","shldVmrc",nil,nil,
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"push gs","pop gs","rsm","btsVmr","shrdVmru","shrdVmrc","fxsave!Dmp","imulVrm",
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--Bx
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"cmpxchgBmr","cmpxchgVmr","$lssVrm","btrVmr",
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"$lfsVrm","$lgsVrm","movzxVrBmt","movzxVrWmt",
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"|popcntVrm","ud2Dp","bt!Vmu","btcVmr",
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"bsfVrm","bsrVrm|lzcntVrm|bsrWrm","movsxVrBmt","movsxVrWmt",
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--Cx
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"xaddBmr","xaddVmr",
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"cmppsXrmu|cmpssXrmu|cmppdXrmu|cmpsdXrmu","$movntiVmr|",
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"pinsrwPrWmu","pextrwDrPmu",
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"shufpsXrmu||shufpdXrmu","$cmpxchg!Qmp",
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"bswapVR","bswapVR","bswapVR","bswapVR","bswapVR","bswapVR","bswapVR","bswapVR",
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--Dx
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"||addsubpdXrm|addsubpsXrm","psrlwPrm","psrldPrm","psrlqPrm",
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"paddqPrm","pmullwPrm",
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"|movq2dqXrMm|movqXmr|movdq2qMrXm$","pmovmskbVrMm||pmovmskbVrXm",
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"psubusbPrm","psubuswPrm","pminubPrm","pandPrm",
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"paddusbPrm","padduswPrm","pmaxubPrm","pandnPrm",
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--Ex
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"pavgbPrm","psrawPrm","psradPrm","pavgwPrm",
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"pmulhuwPrm","pmulhwPrm",
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"|cvtdq2pdXrm|cvttpd2dqXrm|cvtpd2dqXrm","$movntqMmr||$movntdqXmr",
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"psubsbPrm","psubswPrm","pminswPrm","porPrm",
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"paddsbPrm","paddswPrm","pmaxswPrm","pxorPrm",
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--Fx
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"|||lddquXrm","psllwPrm","pslldPrm","psllqPrm",
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"pmuludqPrm","pmaddwdPrm","psadbwPrm","maskmovqMrm||maskmovdquXrm$",
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"psubbPrm","psubwPrm","psubdPrm","psubqPrm",
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"paddbPrm","paddwPrm","padddPrm","ud",
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}
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assert(map_opc2[255] == "ud")
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-- Map for three-byte opcodes. Can't wait for their next invention.
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local map_opc3 = {
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["38"] = { -- [66] 0f 38 xx
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--0x
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[0]="pshufbPrm","phaddwPrm","phadddPrm","phaddswPrm",
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"pmaddubswPrm","phsubwPrm","phsubdPrm","phsubswPrm",
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"psignbPrm","psignwPrm","psigndPrm","pmulhrswPrm",
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nil,nil,nil,nil,
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--1x
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"||pblendvbXrma",nil,nil,nil,
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"||blendvpsXrma","||blendvpdXrma",nil,"||ptestXrm",
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nil,nil,nil,nil,
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"pabsbPrm","pabswPrm","pabsdPrm",nil,
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--2x
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"||pmovsxbwXrm","||pmovsxbdXrm","||pmovsxbqXrm","||pmovsxwdXrm",
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"||pmovsxwqXrm","||pmovsxdqXrm",nil,nil,
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"||pmuldqXrm","||pcmpeqqXrm","||$movntdqaXrm","||packusdwXrm",
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nil,nil,nil,nil,
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--3x
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"||pmovzxbwXrm","||pmovzxbdXrm","||pmovzxbqXrm","||pmovzxwdXrm",
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"||pmovzxwqXrm","||pmovzxdqXrm",nil,"||pcmpgtqXrm",
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"||pminsbXrm","||pminsdXrm","||pminuwXrm","||pminudXrm",
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"||pmaxsbXrm","||pmaxsdXrm","||pmaxuwXrm","||pmaxudXrm",
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--4x
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"||pmulddXrm","||phminposuwXrm",
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--Fx
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[0xf0] = "|||crc32TrBmt",[0xf1] = "|||crc32TrVmt",
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},
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["3a"] = { -- [66] 0f 3a xx
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--0x
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[0x00]=nil,nil,nil,nil,nil,nil,nil,nil,
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"||roundpsXrmu","||roundpdXrmu","||roundssXrmu","||roundsdXrmu",
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"||blendpsXrmu","||blendpdXrmu","||pblendwXrmu","palignrPrmu",
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--1x
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nil,nil,nil,nil,
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"||pextrbVmXru","||pextrwVmXru","||pextrVmSXru","||extractpsVmXru",
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nil,nil,nil,nil,nil,nil,nil,nil,
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--2x
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"||pinsrbXrVmu","||insertpsXrmu","||pinsrXrVmuS",nil,
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--4x
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[0x40] = "||dppsXrmu",
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[0x41] = "||dppdXrmu",
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[0x42] = "||mpsadbwXrmu",
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--6x
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[0x60] = "||pcmpestrmXrmu",[0x61] = "||pcmpestriXrmu",
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[0x62] = "||pcmpistrmXrmu",[0x63] = "||pcmpistriXrmu",
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},
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}
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-- Map for VMX/SVM opcodes 0F 01 C0-FF (sgdt group with register operands).
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local map_opcvm = {
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[0xc1]="vmcall",[0xc2]="vmlaunch",[0xc3]="vmresume",[0xc4]="vmxoff",
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[0xc8]="monitor",[0xc9]="mwait",
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[0xd8]="vmrun",[0xd9]="vmmcall",[0xda]="vmload",[0xdb]="vmsave",
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[0xdc]="stgi",[0xdd]="clgi",[0xde]="skinit",[0xdf]="invlpga",
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[0xf8]="swapgs",[0xf9]="rdtscp",
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}
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-- Map for FP opcodes. And you thought stack machines are simple?
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local map_opcfp = {
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-- D8-DF 00-BF: opcodes with a memory operand.
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-- D8
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[0]="faddFm","fmulFm","fcomFm","fcompFm","fsubFm","fsubrFm","fdivFm","fdivrFm",
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"fldFm",nil,"fstFm","fstpFm","fldenvVm","fldcwWm","fnstenvVm","fnstcwWm",
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-- DA
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"fiaddDm","fimulDm","ficomDm","ficompDm",
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"fisubDm","fisubrDm","fidivDm","fidivrDm",
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-- DB
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"fildDm","fisttpDm","fistDm","fistpDm",nil,"fld twordFmp",nil,"fstp twordFmp",
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-- DC
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"faddGm","fmulGm","fcomGm","fcompGm","fsubGm","fsubrGm","fdivGm","fdivrGm",
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-- DD
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"fldGm","fisttpQm","fstGm","fstpGm","frstorDmp",nil,"fnsaveDmp","fnstswWm",
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-- DE
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"fiaddWm","fimulWm","ficomWm","ficompWm",
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"fisubWm","fisubrWm","fidivWm","fidivrWm",
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-- DF
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"fildWm","fisttpWm","fistWm","fistpWm",
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"fbld twordFmp","fildQm","fbstp twordFmp","fistpQm",
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-- xx C0-FF: opcodes with a pseudo-register operand.
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-- D8
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"faddFf","fmulFf","fcomFf","fcompFf","fsubFf","fsubrFf","fdivFf","fdivrFf",
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-- D9
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"fldFf","fxchFf",{"fnop"},nil,
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{"fchs","fabs",nil,nil,"ftst","fxam"},
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{"fld1","fldl2t","fldl2e","fldpi","fldlg2","fldln2","fldz"},
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{"f2xm1","fyl2x","fptan","fpatan","fxtract","fprem1","fdecstp","fincstp"},
|
|
{"fprem","fyl2xp1","fsqrt","fsincos","frndint","fscale","fsin","fcos"},
|
|
-- DA
|
|
"fcmovbFf","fcmoveFf","fcmovbeFf","fcmovuFf",nil,{nil,"fucompp"},nil,nil,
|
|
-- DB
|
|
"fcmovnbFf","fcmovneFf","fcmovnbeFf","fcmovnuFf",
|
|
{nil,nil,"fnclex","fninit"},"fucomiFf","fcomiFf",nil,
|
|
-- DC
|
|
"fadd toFf","fmul toFf",nil,nil,
|
|
"fsub toFf","fsubr toFf","fdivr toFf","fdiv toFf",
|
|
-- DD
|
|
"ffreeFf",nil,"fstFf","fstpFf","fucomFf","fucompFf",nil,nil,
|
|
-- DE
|
|
"faddpFf","fmulpFf",nil,{nil,"fcompp"},
|
|
"fsubrpFf","fsubpFf","fdivrpFf","fdivpFf",
|
|
-- DF
|
|
nil,nil,nil,nil,{"fnstsw ax"},"fucomipFf","fcomipFf",nil,
|
|
}
|
|
assert(map_opcfp[126] == "fcomipFf")
|
|
|
|
-- Map for opcode groups. The subkey is sp from the ModRM byte.
|
|
local map_opcgroup = {
|
|
arith = { "add", "or", "adc", "sbb", "and", "sub", "xor", "cmp" },
|
|
shift = { "rol", "ror", "rcl", "rcr", "shl", "shr", "sal", "sar" },
|
|
testb = { "testBmi", "testBmi", "not", "neg", "mul", "imul", "div", "idiv" },
|
|
testv = { "testVmi", "testVmi", "not", "neg", "mul", "imul", "div", "idiv" },
|
|
incb = { "inc", "dec" },
|
|
incd = { "inc", "dec", "callUmp", "$call farDmp",
|
|
"jmpUmp", "$jmp farDmp", "pushUm" },
|
|
sldt = { "sldt", "str", "lldt", "ltr", "verr", "verw" },
|
|
sgdt = { "vm*$sgdt", "vm*$sidt", "$lgdt", "vm*$lidt",
|
|
"smsw", nil, "lmsw", "vm*$invlpg" },
|
|
bt = { nil, nil, nil, nil, "bt", "bts", "btr", "btc" },
|
|
cmpxchg = { nil, "sz*,cmpxchg8bQmp,cmpxchg16bXmp", nil, nil,
|
|
nil, nil, "vmptrld|vmxon|vmclear", "vmptrst" },
|
|
pshiftw = { nil, nil, "psrlw", nil, "psraw", nil, "psllw" },
|
|
pshiftd = { nil, nil, "psrld", nil, "psrad", nil, "pslld" },
|
|
pshiftq = { nil, nil, "psrlq", nil, nil, nil, "psllq" },
|
|
pshiftdq = { nil, nil, "psrlq", "psrldq", nil, nil, "psllq", "pslldq" },
|
|
fxsave = { "$fxsave", "$fxrstor", "$ldmxcsr", "$stmxcsr",
|
|
nil, "lfenceDp$", "mfenceDp$", "sfenceDp$clflush" },
|
|
prefetch = { "prefetch", "prefetchw" },
|
|
prefetcht = { "prefetchnta", "prefetcht0", "prefetcht1", "prefetcht2" },
|
|
}
|
|
|
|
------------------------------------------------------------------------------
|
|
|
|
-- Maps for register names.
|
|
local map_regs = {
|
|
B = { "al", "cl", "dl", "bl", "ah", "ch", "dh", "bh",
|
|
"r8b", "r9b", "r10b", "r11b", "r12b", "r13b", "r14b", "r15b" },
|
|
B64 = { "al", "cl", "dl", "bl", "spl", "bpl", "sil", "dil",
|
|
"r8b", "r9b", "r10b", "r11b", "r12b", "r13b", "r14b", "r15b" },
|
|
W = { "ax", "cx", "dx", "bx", "sp", "bp", "si", "di",
|
|
"r8w", "r9w", "r10w", "r11w", "r12w", "r13w", "r14w", "r15w" },
|
|
D = { "eax", "ecx", "edx", "ebx", "esp", "ebp", "esi", "edi",
|
|
"r8d", "r9d", "r10d", "r11d", "r12d", "r13d", "r14d", "r15d" },
|
|
Q = { "rax", "rcx", "rdx", "rbx", "rsp", "rbp", "rsi", "rdi",
|
|
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15" },
|
|
M = { "mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7",
|
|
"mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7" }, -- No x64 ext!
|
|
X = { "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7",
|
|
"xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15" },
|
|
}
|
|
local map_segregs = { "es", "cs", "ss", "ds", "fs", "gs", "segr6", "segr7" }
|
|
|
|
-- Maps for size names.
|
|
local map_sz2n = {
|
|
B = 1, W = 2, D = 4, Q = 8, M = 8, X = 16,
|
|
}
|
|
local map_sz2prefix = {
|
|
B = "byte", W = "word", D = "dword",
|
|
Q = "qword",
|
|
M = "qword", X = "xword",
|
|
F = "dword", G = "qword", -- No need for sizes/register names for these two.
|
|
}
|
|
|
|
------------------------------------------------------------------------------
|
|
|
|
-- Output a nicely formatted line with an opcode and operands.
|
|
local function putop(ctx, text, operands)
|
|
local code, pos, hex = ctx.code, ctx.pos, ""
|
|
local hmax = ctx.hexdump
|
|
if hmax > 0 then
|
|
for i=ctx.start,pos-1 do
|
|
hex = hex..format("%02X", byte(code, i, i))
|
|
end
|
|
if #hex > hmax then hex = sub(hex, 1, hmax)..". "
|
|
else hex = hex..rep(" ", hmax-#hex+2) end
|
|
end
|
|
if operands then text = text.." "..operands end
|
|
if ctx.o16 then text = "o16 "..text; ctx.o16 = false end
|
|
if ctx.a32 then text = "a32 "..text; ctx.a32 = false end
|
|
if ctx.rep then text = ctx.rep.." "..text; ctx.rep = false end
|
|
if ctx.rex then
|
|
local t = (ctx.rexw and "w" or "")..(ctx.rexr and "r" or "")..
|
|
(ctx.rexx and "x" or "")..(ctx.rexb and "b" or "")
|
|
if t ~= "" then text = "rex."..t.." "..text end
|
|
ctx.rexw = false; ctx.rexr = false; ctx.rexx = false; ctx.rexb = false
|
|
ctx.rex = false
|
|
end
|
|
if ctx.seg then
|
|
local text2, n = gsub(text, "%[", "["..ctx.seg..":")
|
|
if n == 0 then text = ctx.seg.." "..text else text = text2 end
|
|
ctx.seg = false
|
|
end
|
|
if ctx.lock then text = "lock "..text; ctx.lock = false end
|
|
local imm = ctx.imm
|
|
if imm then
|
|
local sym = ctx.symtab[imm]
|
|
if sym then text = text.."\t->"..sym end
|
|
end
|
|
ctx.out(format("%08x %s%s\n", ctx.addr+ctx.start, hex, text))
|
|
ctx.mrm = false
|
|
ctx.start = pos
|
|
ctx.imm = nil
|
|
end
|
|
|
|
-- Clear all prefix flags.
|
|
local function clearprefixes(ctx)
|
|
ctx.o16 = false; ctx.seg = false; ctx.lock = false; ctx.rep = false
|
|
ctx.rexw = false; ctx.rexr = false; ctx.rexx = false; ctx.rexb = false
|
|
ctx.rex = false; ctx.a32 = false
|
|
end
|
|
|
|
-- Fallback for incomplete opcodes at the end.
|
|
local function incomplete(ctx)
|
|
ctx.pos = ctx.stop+1
|
|
clearprefixes(ctx)
|
|
return putop(ctx, "(incomplete)")
|
|
end
|
|
|
|
-- Fallback for unknown opcodes.
|
|
local function unknown(ctx)
|
|
clearprefixes(ctx)
|
|
return putop(ctx, "(unknown)")
|
|
end
|
|
|
|
-- Return an immediate of the specified size.
|
|
local function getimm(ctx, pos, n)
|
|
if pos+n-1 > ctx.stop then return incomplete(ctx) end
|
|
local code = ctx.code
|
|
if n == 1 then
|
|
local b1 = byte(code, pos, pos)
|
|
return b1
|
|
elseif n == 2 then
|
|
local b1, b2 = byte(code, pos, pos+1)
|
|
return b1+b2*256
|
|
else
|
|
local b1, b2, b3, b4 = byte(code, pos, pos+3)
|
|
local imm = b1+b2*256+b3*65536+b4*16777216
|
|
ctx.imm = imm
|
|
return imm
|
|
end
|
|
end
|
|
|
|
-- Process pattern string and generate the operands.
|
|
local function putpat(ctx, name, pat)
|
|
local operands, regs, sz, mode, sp, rm, sc, rx, sdisp
|
|
local code, pos, stop = ctx.code, ctx.pos, ctx.stop
|
|
|
|
-- Chars used: 1DFGIMPQRSTUVWXacdfgijmoprstuwxyz
|
|
for p in gmatch(pat, ".") do
|
|
local x = nil
|
|
if p == "V" or p == "U" then
|
|
if ctx.rexw then sz = "Q"; ctx.rexw = false
|
|
elseif ctx.o16 then sz = "W"; ctx.o16 = false
|
|
elseif p == "U" and ctx.x64 then sz = "Q"
|
|
else sz = "D" end
|
|
regs = map_regs[sz]
|
|
elseif p == "T" then
|
|
if ctx.rexw then sz = "Q"; ctx.rexw = false else sz = "D" end
|
|
regs = map_regs[sz]
|
|
elseif p == "B" then
|
|
sz = "B"
|
|
regs = ctx.rex and map_regs.B64 or map_regs.B
|
|
elseif match(p, "[WDQMXFG]") then
|
|
sz = p
|
|
regs = map_regs[sz]
|
|
elseif p == "P" then
|
|
sz = ctx.o16 and "X" or "M"; ctx.o16 = false
|
|
regs = map_regs[sz]
|
|
elseif p == "S" then
|
|
name = name..lower(sz)
|
|
elseif p == "s" then
|
|
local imm = getimm(ctx, pos, 1); if not imm then return end
|
|
x = imm <= 127 and format("+0x%02x", imm)
|
|
or format("-0x%02x", 256-imm)
|
|
pos = pos+1
|
|
elseif p == "u" then
|
|
local imm = getimm(ctx, pos, 1); if not imm then return end
|
|
x = format("0x%02x", imm)
|
|
pos = pos+1
|
|
elseif p == "w" then
|
|
local imm = getimm(ctx, pos, 2); if not imm then return end
|
|
x = format("0x%x", imm)
|
|
pos = pos+2
|
|
elseif p == "o" then -- [offset]
|
|
if ctx.x64 then
|
|
local imm1 = getimm(ctx, pos, 4); if not imm1 then return end
|
|
local imm2 = getimm(ctx, pos+4, 4); if not imm2 then return end
|
|
x = format("[0x%08x%08x]", imm2, imm1)
|
|
pos = pos+8
|
|
else
|
|
local imm = getimm(ctx, pos, 4); if not imm then return end
|
|
x = format("[0x%08x]", imm)
|
|
pos = pos+4
|
|
end
|
|
elseif p == "i" or p == "I" then
|
|
local n = map_sz2n[sz]
|
|
if n == 8 and ctx.x64 and p == "I" then
|
|
local imm1 = getimm(ctx, pos, 4); if not imm1 then return end
|
|
local imm2 = getimm(ctx, pos+4, 4); if not imm2 then return end
|
|
x = format("0x%08x%08x", imm2, imm1)
|
|
else
|
|
if n == 8 then n = 4 end
|
|
local imm = getimm(ctx, pos, n); if not imm then return end
|
|
if sz == "Q" and (imm < 0 or imm > 0x7fffffff) then
|
|
imm = (0xffffffff+1)-imm
|
|
x = format(imm > 65535 and "-0x%08x" or "-0x%x", imm)
|
|
else
|
|
x = format(imm > 65535 and "0x%08x" or "0x%x", imm)
|
|
end
|
|
end
|
|
pos = pos+n
|
|
elseif p == "j" then
|
|
local n = map_sz2n[sz]
|
|
if n == 8 then n = 4 end
|
|
local imm = getimm(ctx, pos, n); if not imm then return end
|
|
if sz == "B" and imm > 127 then imm = imm-256
|
|
elseif imm > 2147483647 then imm = imm-4294967296 end
|
|
pos = pos+n
|
|
imm = imm + pos + ctx.addr
|
|
if imm > 4294967295 and not ctx.x64 then imm = imm-4294967296 end
|
|
ctx.imm = imm
|
|
if sz == "W" then
|
|
x = format("word 0x%04x", imm%65536)
|
|
elseif ctx.x64 then
|
|
local lo = imm % 0x1000000
|
|
x = format("0x%02x%06x", (imm-lo) / 0x1000000, lo)
|
|
else
|
|
x = format("0x%08x", imm)
|
|
end
|
|
elseif p == "R" then
|
|
local r = byte(code, pos-1, pos-1)%8
|
|
if ctx.rexb then r = r + 8; ctx.rexb = false end
|
|
x = regs[r+1]
|
|
elseif p == "a" then x = regs[1]
|
|
elseif p == "c" then x = "cl"
|
|
elseif p == "d" then x = "dx"
|
|
elseif p == "1" then x = "1"
|
|
else
|
|
if not mode then
|
|
mode = ctx.mrm
|
|
if not mode then
|
|
if pos > stop then return incomplete(ctx) end
|
|
mode = byte(code, pos, pos)
|
|
pos = pos+1
|
|
end
|
|
rm = mode%8; mode = (mode-rm)/8
|
|
sp = mode%8; mode = (mode-sp)/8
|
|
sdisp = ""
|
|
if mode < 3 then
|
|
if rm == 4 then
|
|
if pos > stop then return incomplete(ctx) end
|
|
sc = byte(code, pos, pos)
|
|
pos = pos+1
|
|
rm = sc%8; sc = (sc-rm)/8
|
|
rx = sc%8; sc = (sc-rx)/8
|
|
if ctx.rexx then rx = rx + 8; ctx.rexx = false end
|
|
if rx == 4 then rx = nil end
|
|
end
|
|
if mode > 0 or rm == 5 then
|
|
local dsz = mode
|
|
if dsz ~= 1 then dsz = 4 end
|
|
local disp = getimm(ctx, pos, dsz); if not disp then return end
|
|
if mode == 0 then rm = nil end
|
|
if rm or rx or (not sc and ctx.x64 and not ctx.a32) then
|
|
if dsz == 1 and disp > 127 then
|
|
sdisp = format("-0x%x", 256-disp)
|
|
elseif disp >= 0 and disp <= 0x7fffffff then
|
|
sdisp = format("+0x%x", disp)
|
|
else
|
|
sdisp = format("-0x%x", (0xffffffff+1)-disp)
|
|
end
|
|
else
|
|
sdisp = format(ctx.x64 and not ctx.a32 and
|
|
not (disp >= 0 and disp <= 0x7fffffff)
|
|
and "0xffffffff%08x" or "0x%08x", disp)
|
|
end
|
|
pos = pos+dsz
|
|
end
|
|
end
|
|
if rm and ctx.rexb then rm = rm + 8; ctx.rexb = false end
|
|
if ctx.rexr then sp = sp + 8; ctx.rexr = false end
|
|
end
|
|
if p == "m" then
|
|
if mode == 3 then x = regs[rm+1]
|
|
else
|
|
local aregs = ctx.a32 and map_regs.D or ctx.aregs
|
|
local srm, srx = "", ""
|
|
if rm then srm = aregs[rm+1]
|
|
elseif not sc and ctx.x64 and not ctx.a32 then srm = "rip" end
|
|
ctx.a32 = false
|
|
if rx then
|
|
if rm then srm = srm.."+" end
|
|
srx = aregs[rx+1]
|
|
if sc > 0 then srx = srx.."*"..(2^sc) end
|
|
end
|
|
x = format("[%s%s%s]", srm, srx, sdisp)
|
|
end
|
|
if mode < 3 and
|
|
(not match(pat, "[aRrgp]") or match(pat, "t")) then -- Yuck.
|
|
x = map_sz2prefix[sz].." "..x
|
|
end
|
|
elseif p == "r" then x = regs[sp+1]
|
|
elseif p == "g" then x = map_segregs[sp+1]
|
|
elseif p == "p" then -- Suppress prefix.
|
|
elseif p == "f" then x = "st"..rm
|
|
elseif p == "x" then
|
|
if sp == 0 and ctx.lock and not ctx.x64 then
|
|
x = "CR8"; ctx.lock = false
|
|
else
|
|
x = "CR"..sp
|
|
end
|
|
elseif p == "y" then x = "DR"..sp
|
|
elseif p == "z" then x = "TR"..sp
|
|
elseif p == "t" then
|
|
else
|
|
error("bad pattern `"..pat.."'")
|
|
end
|
|
end
|
|
if x then operands = operands and operands..", "..x or x end
|
|
end
|
|
ctx.pos = pos
|
|
return putop(ctx, name, operands)
|
|
end
|
|
|
|
-- Forward declaration.
|
|
local map_act
|
|
|
|
-- Fetch and cache MRM byte.
|
|
local function getmrm(ctx)
|
|
local mrm = ctx.mrm
|
|
if not mrm then
|
|
local pos = ctx.pos
|
|
if pos > ctx.stop then return nil end
|
|
mrm = byte(ctx.code, pos, pos)
|
|
ctx.pos = pos+1
|
|
ctx.mrm = mrm
|
|
end
|
|
return mrm
|
|
end
|
|
|
|
-- Dispatch to handler depending on pattern.
|
|
local function dispatch(ctx, opat, patgrp)
|
|
if not opat then return unknown(ctx) end
|
|
if match(opat, "%|") then -- MMX/SSE variants depending on prefix.
|
|
local p
|
|
if ctx.rep then
|
|
p = ctx.rep=="rep" and "%|([^%|]*)" or "%|[^%|]*%|[^%|]*%|([^%|]*)"
|
|
ctx.rep = false
|
|
elseif ctx.o16 then p = "%|[^%|]*%|([^%|]*)"; ctx.o16 = false
|
|
else p = "^[^%|]*" end
|
|
opat = match(opat, p)
|
|
if not opat then return unknown(ctx) end
|
|
-- ctx.rep = false; ctx.o16 = false
|
|
--XXX fails for 66 f2 0f 38 f1 06 crc32 eax,WORD PTR [esi]
|
|
--XXX remove in branches?
|
|
end
|
|
if match(opat, "%$") then -- reg$mem variants.
|
|
local mrm = getmrm(ctx); if not mrm then return incomplete(ctx) end
|
|
opat = match(opat, mrm >= 192 and "^[^%$]*" or "%$(.*)")
|
|
if opat == "" then return unknown(ctx) end
|
|
end
|
|
if opat == "" then return unknown(ctx) end
|
|
local name, pat = match(opat, "^([a-z0-9 ]*)(.*)")
|
|
if pat == "" and patgrp then pat = patgrp end
|
|
return map_act[sub(pat, 1, 1)](ctx, name, pat)
|
|
end
|
|
|
|
-- Get a pattern from an opcode map and dispatch to handler.
|
|
local function dispatchmap(ctx, opcmap)
|
|
local pos = ctx.pos
|
|
local opat = opcmap[byte(ctx.code, pos, pos)]
|
|
pos = pos + 1
|
|
ctx.pos = pos
|
|
return dispatch(ctx, opat)
|
|
end
|
|
|
|
-- Map for action codes. The key is the first char after the name.
|
|
map_act = {
|
|
-- Simple opcodes without operands.
|
|
[""] = function(ctx, name, pat)
|
|
return putop(ctx, name)
|
|
end,
|
|
|
|
-- Operand size chars fall right through.
|
|
B = putpat, W = putpat, D = putpat, Q = putpat,
|
|
V = putpat, U = putpat, T = putpat,
|
|
M = putpat, X = putpat, P = putpat,
|
|
F = putpat, G = putpat,
|
|
|
|
-- Collect prefixes.
|
|
[":"] = function(ctx, name, pat)
|
|
ctx[pat == ":" and name or sub(pat, 2)] = name
|
|
if ctx.pos - ctx.start > 5 then return unknown(ctx) end -- Limit #prefixes.
|
|
end,
|
|
|
|
-- Chain to special handler specified by name.
|
|
["*"] = function(ctx, name, pat)
|
|
return map_act[name](ctx, name, sub(pat, 2))
|
|
end,
|
|
|
|
-- Use named subtable for opcode group.
|
|
["!"] = function(ctx, name, pat)
|
|
local mrm = getmrm(ctx); if not mrm then return incomplete(ctx) end
|
|
return dispatch(ctx, map_opcgroup[name][((mrm-(mrm%8))/8)%8+1], sub(pat, 2))
|
|
end,
|
|
|
|
-- o16,o32[,o64] variants.
|
|
sz = function(ctx, name, pat)
|
|
if ctx.o16 then ctx.o16 = false
|
|
else
|
|
pat = match(pat, ",(.*)")
|
|
if ctx.rexw then
|
|
local p = match(pat, ",(.*)")
|
|
if p then pat = p; ctx.rexw = false end
|
|
end
|
|
end
|
|
pat = match(pat, "^[^,]*")
|
|
return dispatch(ctx, pat)
|
|
end,
|
|
|
|
-- Two-byte opcode dispatch.
|
|
opc2 = function(ctx, name, pat)
|
|
return dispatchmap(ctx, map_opc2)
|
|
end,
|
|
|
|
-- Three-byte opcode dispatch.
|
|
opc3 = function(ctx, name, pat)
|
|
return dispatchmap(ctx, map_opc3[pat])
|
|
end,
|
|
|
|
-- VMX/SVM dispatch.
|
|
vm = function(ctx, name, pat)
|
|
return dispatch(ctx, map_opcvm[ctx.mrm])
|
|
end,
|
|
|
|
-- Floating point opcode dispatch.
|
|
fp = function(ctx, name, pat)
|
|
local mrm = getmrm(ctx); if not mrm then return incomplete(ctx) end
|
|
local rm = mrm%8
|
|
local idx = pat*8 + ((mrm-rm)/8)%8
|
|
if mrm >= 192 then idx = idx + 64 end
|
|
local opat = map_opcfp[idx]
|
|
if type(opat) == "table" then opat = opat[rm+1] end
|
|
return dispatch(ctx, opat)
|
|
end,
|
|
|
|
-- REX prefix.
|
|
rex = function(ctx, name, pat)
|
|
if ctx.rex then return unknown(ctx) end -- Only 1 REX prefix allowed.
|
|
for p in gmatch(pat, ".") do ctx["rex"..p] = true end
|
|
ctx.rex = true
|
|
end,
|
|
|
|
-- Special case for nop with REX prefix.
|
|
nop = function(ctx, name, pat)
|
|
return dispatch(ctx, ctx.rex and pat or "nop")
|
|
end,
|
|
}
|
|
|
|
------------------------------------------------------------------------------
|
|
|
|
-- Disassemble a block of code.
|
|
local function disass_block(ctx, ofs, len)
|
|
if not ofs then ofs = 0 end
|
|
local stop = len and ofs+len or #ctx.code
|
|
ofs = ofs + 1
|
|
ctx.start = ofs
|
|
ctx.pos = ofs
|
|
ctx.stop = stop
|
|
ctx.imm = nil
|
|
ctx.mrm = false
|
|
clearprefixes(ctx)
|
|
while ctx.pos <= stop do dispatchmap(ctx, ctx.map1) end
|
|
if ctx.pos ~= ctx.start then incomplete(ctx) end
|
|
end
|
|
|
|
-- Extended API: create a disassembler context. Then call ctx:disass(ofs, len).
|
|
local function create_(code, addr, out)
|
|
local ctx = {}
|
|
ctx.code = code
|
|
ctx.addr = (addr or 0) - 1
|
|
ctx.out = out or io.write
|
|
ctx.symtab = {}
|
|
ctx.disass = disass_block
|
|
ctx.hexdump = 16
|
|
ctx.x64 = false
|
|
ctx.map1 = map_opc1_32
|
|
ctx.aregs = map_regs.D
|
|
return ctx
|
|
end
|
|
|
|
local function create64_(code, addr, out)
|
|
local ctx = create_(code, addr, out)
|
|
ctx.x64 = true
|
|
ctx.map1 = map_opc1_64
|
|
ctx.aregs = map_regs.Q
|
|
return ctx
|
|
end
|
|
|
|
-- Simple API: disassemble code (a string) at address and output via out.
|
|
local function disass_(code, addr, out)
|
|
create_(code, addr, out):disass()
|
|
end
|
|
|
|
local function disass64_(code, addr, out)
|
|
create64_(code, addr, out):disass()
|
|
end
|
|
|
|
-- Return register name for RID.
|
|
local function regname_(r)
|
|
if r < 8 then return map_regs.D[r+1] end
|
|
return map_regs.X[r-7]
|
|
end
|
|
|
|
local function regname64_(r)
|
|
if r < 16 then return map_regs.Q[r+1] end
|
|
return map_regs.X[r-15]
|
|
end
|
|
|
|
-- Public module functions.
|
|
module(...)
|
|
|
|
create = create_
|
|
create64 = create64_
|
|
disass = disass_
|
|
disass64 = disass64_
|
|
regname = regname_
|
|
regname64 = regname64_
|
|
|