forked from mia/Aegisub
1217 lines
30 KiB
Lua
1217 lines
30 KiB
Lua
----------------------------------------------------------------------------
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-- LuaJIT ARM64 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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-- Contributed by Djordje Kovacevic and Stefan Pejic from RT-RK.com.
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-- Sponsored by Cisco Systems, Inc.
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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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-- It disassembles most user-mode AArch64 instructions.
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-- NYI: Advanced SIMD and VFP instructions.
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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 concat = table.concat
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local bit = require("bit")
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local band, bor, bxor, tohex = bit.band, bit.bor, bit.bxor, bit.tohex
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local lshift, rshift, arshift = bit.lshift, bit.rshift, bit.arshift
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local ror = bit.ror
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------------------------------------------------------------------------------
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-- Opcode maps
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------------------------------------------------------------------------------
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local map_adr = { -- PC-relative addressing.
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shift = 31, mask = 1,
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[0] = "adrDBx", "adrpDBx"
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}
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local map_addsubi = { -- Add/subtract immediate.
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shift = 29, mask = 3,
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[0] = "add|movDNIg", "adds|cmnD0NIg", "subDNIg", "subs|cmpD0NIg",
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}
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local map_logi = { -- Logical immediate.
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shift = 31, mask = 1,
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[0] = {
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shift = 22, mask = 1,
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[0] = {
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shift = 29, mask = 3,
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[0] = "andDNig", "orr|movDN0ig", "eorDNig", "ands|tstD0Nig"
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},
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false -- unallocated
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},
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{
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shift = 29, mask = 3,
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[0] = "andDNig", "orr|movDN0ig", "eorDNig", "ands|tstD0Nig"
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}
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}
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local map_movwi = { -- Move wide immediate.
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shift = 31, mask = 1,
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[0] = {
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shift = 22, mask = 1,
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[0] = {
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shift = 29, mask = 3,
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[0] = "movnDWRg", false, "movz|movDYRg", "movkDWRg"
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}, false -- unallocated
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},
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{
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shift = 29, mask = 3,
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[0] = "movnDWRg", false, "movz|movDYRg", "movkDWRg"
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},
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}
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local map_bitf = { -- Bitfield.
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shift = 31, mask = 1,
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[0] = {
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shift = 22, mask = 1,
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[0] = {
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shift = 29, mask = 3,
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[0] = "sbfm|sbfiz|sbfx|asr|sxtw|sxth|sxtbDN12w",
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"bfm|bfi|bfxilDN13w",
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"ubfm|ubfiz|ubfx|lsr|lsl|uxth|uxtbDN12w"
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}
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},
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{
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shift = 22, mask = 1,
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{
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shift = 29, mask = 3,
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[0] = "sbfm|sbfiz|sbfx|asr|sxtw|sxth|sxtbDN12x",
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"bfm|bfi|bfxilDN13x",
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"ubfm|ubfiz|ubfx|lsr|lsl|uxth|uxtbDN12x"
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}
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}
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}
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local map_datai = { -- Data processing - immediate.
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shift = 23, mask = 7,
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[0] = map_adr, map_adr, map_addsubi, false,
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map_logi, map_movwi, map_bitf,
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{
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shift = 15, mask = 0x1c0c1,
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[0] = "extr|rorDNM4w", [0x10080] = "extr|rorDNM4x",
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[0x10081] = "extr|rorDNM4x"
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}
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}
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local map_logsr = { -- Logical, shifted register.
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shift = 31, mask = 1,
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[0] = {
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shift = 15, mask = 1,
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[0] = {
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shift = 29, mask = 3,
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[0] = {
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shift = 21, mask = 7,
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[0] = "andDNMSg", "bicDNMSg", "andDNMSg", "bicDNMSg",
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"andDNMSg", "bicDNMSg", "andDNMg", "bicDNMg"
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},
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{
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shift = 21, mask = 7,
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[0] ="orr|movDN0MSg", "orn|mvnDN0MSg", "orr|movDN0MSg", "orn|mvnDN0MSg",
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"orr|movDN0MSg", "orn|mvnDN0MSg", "orr|movDN0Mg", "orn|mvnDN0Mg"
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},
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{
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shift = 21, mask = 7,
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[0] = "eorDNMSg", "eonDNMSg", "eorDNMSg", "eonDNMSg",
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"eorDNMSg", "eonDNMSg", "eorDNMg", "eonDNMg"
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},
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{
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shift = 21, mask = 7,
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[0] = "ands|tstD0NMSg", "bicsDNMSg", "ands|tstD0NMSg", "bicsDNMSg",
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"ands|tstD0NMSg", "bicsDNMSg", "ands|tstD0NMg", "bicsDNMg"
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}
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},
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false -- unallocated
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},
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{
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shift = 29, mask = 3,
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[0] = {
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shift = 21, mask = 7,
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[0] = "andDNMSg", "bicDNMSg", "andDNMSg", "bicDNMSg",
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"andDNMSg", "bicDNMSg", "andDNMg", "bicDNMg"
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},
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{
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shift = 21, mask = 7,
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[0] = "orr|movDN0MSg", "orn|mvnDN0MSg", "orr|movDN0MSg", "orn|mvnDN0MSg",
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"orr|movDN0MSg", "orn|mvnDN0MSg", "orr|movDN0Mg", "orn|mvnDN0Mg"
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},
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{
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shift = 21, mask = 7,
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[0] = "eorDNMSg", "eonDNMSg", "eorDNMSg", "eonDNMSg",
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"eorDNMSg", "eonDNMSg", "eorDNMg", "eonDNMg"
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},
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{
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shift = 21, mask = 7,
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[0] = "ands|tstD0NMSg", "bicsDNMSg", "ands|tstD0NMSg", "bicsDNMSg",
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"ands|tstD0NMSg", "bicsDNMSg", "ands|tstD0NMg", "bicsDNMg"
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}
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}
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}
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local map_assh = {
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shift = 31, mask = 1,
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[0] = {
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shift = 15, mask = 1,
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[0] = {
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shift = 29, mask = 3,
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[0] = {
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shift = 22, mask = 3,
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[0] = "addDNMSg", "addDNMSg", "addDNMSg", "addDNMg"
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},
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{
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shift = 22, mask = 3,
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[0] = "adds|cmnD0NMSg", "adds|cmnD0NMSg",
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"adds|cmnD0NMSg", "adds|cmnD0NMg"
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},
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{
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shift = 22, mask = 3,
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[0] = "sub|negDN0MSg", "sub|negDN0MSg", "sub|negDN0MSg", "sub|negDN0Mg"
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},
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{
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shift = 22, mask = 3,
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[0] = "subs|cmp|negsD0N0MzSg", "subs|cmp|negsD0N0MzSg",
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"subs|cmp|negsD0N0MzSg", "subs|cmp|negsD0N0Mzg"
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},
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},
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false -- unallocated
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},
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{
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shift = 29, mask = 3,
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[0] = {
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shift = 22, mask = 3,
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[0] = "addDNMSg", "addDNMSg", "addDNMSg", "addDNMg"
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},
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{
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shift = 22, mask = 3,
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[0] = "adds|cmnD0NMSg", "adds|cmnD0NMSg", "adds|cmnD0NMSg",
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"adds|cmnD0NMg"
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},
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{
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shift = 22, mask = 3,
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[0] = "sub|negDN0MSg", "sub|negDN0MSg", "sub|negDN0MSg", "sub|negDN0Mg"
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},
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{
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shift = 22, mask = 3,
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[0] = "subs|cmp|negsD0N0MzSg", "subs|cmp|negsD0N0MzSg",
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"subs|cmp|negsD0N0MzSg", "subs|cmp|negsD0N0Mzg"
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}
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}
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}
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local map_addsubsh = { -- Add/subtract, shifted register.
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shift = 22, mask = 3,
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[0] = map_assh, map_assh, map_assh
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}
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local map_addsubex = { -- Add/subtract, extended register.
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shift = 22, mask = 3,
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[0] = {
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shift = 29, mask = 3,
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[0] = "addDNMXg", "adds|cmnD0NMXg", "subDNMXg", "subs|cmpD0NMzXg",
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}
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}
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local map_addsubc = { -- Add/subtract, with carry.
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shift = 10, mask = 63,
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[0] = {
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shift = 29, mask = 3,
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[0] = "adcDNMg", "adcsDNMg", "sbc|ngcDN0Mg", "sbcs|ngcsDN0Mg",
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}
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}
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local map_ccomp = {
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shift = 4, mask = 1,
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[0] = {
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shift = 10, mask = 3,
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[0] = { -- Conditional compare register.
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shift = 29, mask = 3,
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"ccmnNMVCg", false, "ccmpNMVCg",
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},
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[2] = { -- Conditional compare immediate.
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shift = 29, mask = 3,
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"ccmnN5VCg", false, "ccmpN5VCg",
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}
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}
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}
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local map_csel = { -- Conditional select.
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shift = 11, mask = 1,
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[0] = {
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shift = 10, mask = 1,
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[0] = {
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shift = 29, mask = 3,
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[0] = "cselDNMzCg", false, "csinv|cinv|csetmDNMcg", false,
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},
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{
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shift = 29, mask = 3,
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[0] = "csinc|cinc|csetDNMcg", false, "csneg|cnegDNMcg", false,
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}
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}
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}
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local map_data1s = { -- Data processing, 1 source.
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shift = 29, mask = 1,
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[0] = {
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shift = 31, mask = 1,
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[0] = {
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shift = 10, mask = 0x7ff,
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[0] = "rbitDNg", "rev16DNg", "revDNw", false, "clzDNg", "clsDNg"
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},
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{
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shift = 10, mask = 0x7ff,
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[0] = "rbitDNg", "rev16DNg", "rev32DNx", "revDNx", "clzDNg", "clsDNg"
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}
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}
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}
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local map_data2s = { -- Data processing, 2 sources.
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shift = 29, mask = 1,
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[0] = {
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shift = 10, mask = 63,
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false, "udivDNMg", "sdivDNMg", false, false, false, false, "lslDNMg",
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"lsrDNMg", "asrDNMg", "rorDNMg"
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}
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}
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local map_data3s = { -- Data processing, 3 sources.
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shift = 29, mask = 7,
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[0] = {
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shift = 21, mask = 7,
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[0] = {
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shift = 15, mask = 1,
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[0] = "madd|mulDNMA0g", "msub|mnegDNMA0g"
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}
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}, false, false, false,
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{
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shift = 15, mask = 1,
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[0] = {
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shift = 21, mask = 7,
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[0] = "madd|mulDNMA0g", "smaddl|smullDxNMwA0x", "smulhDNMx", false,
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false, "umaddl|umullDxNMwA0x", "umulhDNMx"
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},
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{
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shift = 21, mask = 7,
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[0] = "msub|mnegDNMA0g", "smsubl|smneglDxNMwA0x", false, false,
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false, "umsubl|umneglDxNMwA0x"
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}
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}
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}
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local map_datar = { -- Data processing, register.
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shift = 28, mask = 1,
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[0] = {
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shift = 24, mask = 1,
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[0] = map_logsr,
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{
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shift = 21, mask = 1,
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[0] = map_addsubsh, map_addsubex
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}
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},
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{
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shift = 21, mask = 15,
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[0] = map_addsubc, false, map_ccomp, false, map_csel, false,
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{
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shift = 30, mask = 1,
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[0] = map_data2s, map_data1s
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},
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false, map_data3s, map_data3s, map_data3s, map_data3s, map_data3s,
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map_data3s, map_data3s, map_data3s
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}
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}
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local map_lrl = { -- Load register, literal.
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shift = 26, mask = 1,
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[0] = {
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shift = 30, mask = 3,
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[0] = "ldrDwB", "ldrDxB", "ldrswDxB"
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},
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{
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shift = 30, mask = 3,
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[0] = "ldrDsB", "ldrDdB"
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}
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}
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local map_lsriind = { -- Load/store register, immediate pre/post-indexed.
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shift = 30, mask = 3,
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[0] = {
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shift = 26, mask = 1,
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[0] = {
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shift = 22, mask = 3,
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[0] = "strbDwzL", "ldrbDwzL", "ldrsbDxzL", "ldrsbDwzL"
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}
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},
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{
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shift = 26, mask = 1,
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[0] = {
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shift = 22, mask = 3,
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[0] = "strhDwzL", "ldrhDwzL", "ldrshDxzL", "ldrshDwzL"
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}
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},
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{
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shift = 26, mask = 1,
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[0] = {
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shift = 22, mask = 3,
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[0] = "strDwzL", "ldrDwzL", "ldrswDxzL"
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},
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{
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shift = 22, mask = 3,
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[0] = "strDszL", "ldrDszL"
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}
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},
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{
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shift = 26, mask = 1,
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[0] = {
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shift = 22, mask = 3,
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[0] = "strDxzL", "ldrDxzL"
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},
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{
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shift = 22, mask = 3,
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[0] = "strDdzL", "ldrDdzL"
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}
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}
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}
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local map_lsriro = {
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shift = 21, mask = 1,
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[0] = { -- Load/store register immediate.
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shift = 10, mask = 3,
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[0] = { -- Unscaled immediate.
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shift = 26, mask = 1,
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[0] = {
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shift = 30, mask = 3,
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[0] = {
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shift = 22, mask = 3,
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[0] = "sturbDwK", "ldurbDwK"
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},
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{
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shift = 22, mask = 3,
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[0] = "sturhDwK", "ldurhDwK"
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},
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{
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shift = 22, mask = 3,
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[0] = "sturDwK", "ldurDwK"
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},
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{
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shift = 22, mask = 3,
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[0] = "sturDxK", "ldurDxK"
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}
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}
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}, map_lsriind, false, map_lsriind
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},
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{ -- Load/store register, register offset.
|
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shift = 10, mask = 3,
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[2] = {
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shift = 26, mask = 1,
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[0] = {
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shift = 30, mask = 3,
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[0] = {
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shift = 22, mask = 3,
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[0] = "strbDwO", "ldrbDwO", "ldrsbDxO", "ldrsbDwO"
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},
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{
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shift = 22, mask = 3,
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[0] = "strhDwO", "ldrhDwO", "ldrshDxO", "ldrshDwO"
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},
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{
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shift = 22, mask = 3,
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[0] = "strDwO", "ldrDwO", "ldrswDxO"
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},
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{
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shift = 22, mask = 3,
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[0] = "strDxO", "ldrDxO"
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}
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},
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{
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shift = 30, mask = 3,
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[2] = {
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shift = 22, mask = 3,
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[0] = "strDsO", "ldrDsO"
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},
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[3] = {
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shift = 22, mask = 3,
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[0] = "strDdO", "ldrDdO"
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}
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}
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}
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}
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}
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local map_lsp = { -- Load/store register pair, offset.
|
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shift = 22, mask = 1,
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[0] = {
|
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shift = 30, mask = 3,
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[0] = {
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shift = 26, mask = 1,
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[0] = "stpDzAzwP", "stpDzAzsP",
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},
|
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{
|
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shift = 26, mask = 1,
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"stpDzAzdP"
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},
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{
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shift = 26, mask = 1,
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[0] = "stpDzAzxP"
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}
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},
|
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{
|
|
shift = 30, mask = 3,
|
|
[0] = {
|
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shift = 26, mask = 1,
|
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[0] = "ldpDzAzwP", "ldpDzAzsP",
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},
|
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{
|
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shift = 26, mask = 1,
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[0] = "ldpswDAxP", "ldpDzAzdP"
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},
|
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{
|
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shift = 26, mask = 1,
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[0] = "ldpDzAzxP"
|
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}
|
|
}
|
|
}
|
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|
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local map_ls = { -- Loads and stores.
|
|
shift = 24, mask = 0x31,
|
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[0x10] = map_lrl, [0x30] = map_lsriro,
|
|
[0x20] = {
|
|
shift = 23, mask = 3,
|
|
map_lsp, map_lsp, map_lsp
|
|
},
|
|
[0x21] = {
|
|
shift = 23, mask = 3,
|
|
map_lsp, map_lsp, map_lsp
|
|
},
|
|
[0x31] = {
|
|
shift = 26, mask = 1,
|
|
[0] = {
|
|
shift = 30, mask = 3,
|
|
[0] = {
|
|
shift = 22, mask = 3,
|
|
[0] = "strbDwzU", "ldrbDwzU"
|
|
},
|
|
{
|
|
shift = 22, mask = 3,
|
|
[0] = "strhDwzU", "ldrhDwzU"
|
|
},
|
|
{
|
|
shift = 22, mask = 3,
|
|
[0] = "strDwzU", "ldrDwzU"
|
|
},
|
|
{
|
|
shift = 22, mask = 3,
|
|
[0] = "strDxzU", "ldrDxzU"
|
|
}
|
|
},
|
|
{
|
|
shift = 30, mask = 3,
|
|
[2] = {
|
|
shift = 22, mask = 3,
|
|
[0] = "strDszU", "ldrDszU"
|
|
},
|
|
[3] = {
|
|
shift = 22, mask = 3,
|
|
[0] = "strDdzU", "ldrDdzU"
|
|
}
|
|
}
|
|
},
|
|
}
|
|
|
|
local map_datafp = { -- Data processing, SIMD and FP.
|
|
shift = 28, mask = 7,
|
|
{ -- 001
|
|
shift = 24, mask = 1,
|
|
[0] = {
|
|
shift = 21, mask = 1,
|
|
{
|
|
shift = 10, mask = 3,
|
|
[0] = {
|
|
shift = 12, mask = 1,
|
|
[0] = {
|
|
shift = 13, mask = 1,
|
|
[0] = {
|
|
shift = 14, mask = 1,
|
|
[0] = {
|
|
shift = 15, mask = 1,
|
|
[0] = { -- FP/int conversion.
|
|
shift = 31, mask = 1,
|
|
[0] = {
|
|
shift = 16, mask = 0xff,
|
|
[0x20] = "fcvtnsDwNs", [0x21] = "fcvtnuDwNs",
|
|
[0x22] = "scvtfDsNw", [0x23] = "ucvtfDsNw",
|
|
[0x24] = "fcvtasDwNs", [0x25] = "fcvtauDwNs",
|
|
[0x26] = "fmovDwNs", [0x27] = "fmovDsNw",
|
|
[0x28] = "fcvtpsDwNs", [0x29] = "fcvtpuDwNs",
|
|
[0x30] = "fcvtmsDwNs", [0x31] = "fcvtmuDwNs",
|
|
[0x38] = "fcvtzsDwNs", [0x39] = "fcvtzuDwNs",
|
|
[0x60] = "fcvtnsDwNd", [0x61] = "fcvtnuDwNd",
|
|
[0x62] = "scvtfDdNw", [0x63] = "ucvtfDdNw",
|
|
[0x64] = "fcvtasDwNd", [0x65] = "fcvtauDwNd",
|
|
[0x68] = "fcvtpsDwNd", [0x69] = "fcvtpuDwNd",
|
|
[0x70] = "fcvtmsDwNd", [0x71] = "fcvtmuDwNd",
|
|
[0x78] = "fcvtzsDwNd", [0x79] = "fcvtzuDwNd"
|
|
},
|
|
{
|
|
shift = 16, mask = 0xff,
|
|
[0x20] = "fcvtnsDxNs", [0x21] = "fcvtnuDxNs",
|
|
[0x22] = "scvtfDsNx", [0x23] = "ucvtfDsNx",
|
|
[0x24] = "fcvtasDxNs", [0x25] = "fcvtauDxNs",
|
|
[0x28] = "fcvtpsDxNs", [0x29] = "fcvtpuDxNs",
|
|
[0x30] = "fcvtmsDxNs", [0x31] = "fcvtmuDxNs",
|
|
[0x38] = "fcvtzsDxNs", [0x39] = "fcvtzuDxNs",
|
|
[0x60] = "fcvtnsDxNd", [0x61] = "fcvtnuDxNd",
|
|
[0x62] = "scvtfDdNx", [0x63] = "ucvtfDdNx",
|
|
[0x64] = "fcvtasDxNd", [0x65] = "fcvtauDxNd",
|
|
[0x66] = "fmovDxNd", [0x67] = "fmovDdNx",
|
|
[0x68] = "fcvtpsDxNd", [0x69] = "fcvtpuDxNd",
|
|
[0x70] = "fcvtmsDxNd", [0x71] = "fcvtmuDxNd",
|
|
[0x78] = "fcvtzsDxNd", [0x79] = "fcvtzuDxNd"
|
|
}
|
|
}
|
|
},
|
|
{ -- FP data-processing, 1 source.
|
|
shift = 31, mask = 1,
|
|
[0] = {
|
|
shift = 22, mask = 3,
|
|
[0] = {
|
|
shift = 15, mask = 63,
|
|
[0] = "fmovDNf", "fabsDNf", "fnegDNf",
|
|
"fsqrtDNf", false, "fcvtDdNs", false, false,
|
|
"frintnDNf", "frintpDNf", "frintmDNf", "frintzDNf",
|
|
"frintaDNf", false, "frintxDNf", "frintiDNf",
|
|
},
|
|
{
|
|
shift = 15, mask = 63,
|
|
[0] = "fmovDNf", "fabsDNf", "fnegDNf",
|
|
"fsqrtDNf", "fcvtDsNd", false, false, false,
|
|
"frintnDNf", "frintpDNf", "frintmDNf", "frintzDNf",
|
|
"frintaDNf", false, "frintxDNf", "frintiDNf",
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{ -- FP compare.
|
|
shift = 31, mask = 1,
|
|
[0] = {
|
|
shift = 14, mask = 3,
|
|
[0] = {
|
|
shift = 23, mask = 1,
|
|
[0] = {
|
|
shift = 0, mask = 31,
|
|
[0] = "fcmpNMf", [8] = "fcmpNZf",
|
|
[16] = "fcmpeNMf", [24] = "fcmpeNZf",
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{ -- FP immediate.
|
|
shift = 31, mask = 1,
|
|
[0] = {
|
|
shift = 5, mask = 31,
|
|
[0] = {
|
|
shift = 23, mask = 1,
|
|
[0] = "fmovDFf"
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{ -- FP conditional compare.
|
|
shift = 31, mask = 1,
|
|
[0] = {
|
|
shift = 23, mask = 1,
|
|
[0] = {
|
|
shift = 4, mask = 1,
|
|
[0] = "fccmpNMVCf", "fccmpeNMVCf"
|
|
}
|
|
}
|
|
},
|
|
{ -- FP data-processing, 2 sources.
|
|
shift = 31, mask = 1,
|
|
[0] = {
|
|
shift = 23, mask = 1,
|
|
[0] = {
|
|
shift = 12, mask = 15,
|
|
[0] = "fmulDNMf", "fdivDNMf", "faddDNMf", "fsubDNMf",
|
|
"fmaxDNMf", "fminDNMf", "fmaxnmDNMf", "fminnmDNMf",
|
|
"fnmulDNMf"
|
|
}
|
|
}
|
|
},
|
|
{ -- FP conditional select.
|
|
shift = 31, mask = 1,
|
|
[0] = {
|
|
shift = 23, mask = 1,
|
|
[0] = "fcselDNMCf"
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{ -- FP data-processing, 3 sources.
|
|
shift = 31, mask = 1,
|
|
[0] = {
|
|
shift = 15, mask = 1,
|
|
[0] = {
|
|
shift = 21, mask = 5,
|
|
[0] = "fmaddDNMAf", "fnmaddDNMAf"
|
|
},
|
|
{
|
|
shift = 21, mask = 5,
|
|
[0] = "fmsubDNMAf", "fnmsubDNMAf"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
local map_br = { -- Branches, exception generating and system instructions.
|
|
shift = 29, mask = 7,
|
|
[0] = "bB",
|
|
{ -- Compare & branch, immediate.
|
|
shift = 24, mask = 3,
|
|
[0] = "cbzDBg", "cbnzDBg", "tbzDTBw", "tbnzDTBw"
|
|
},
|
|
{ -- Conditional branch, immediate.
|
|
shift = 24, mask = 3,
|
|
[0] = {
|
|
shift = 4, mask = 1,
|
|
[0] = {
|
|
shift = 0, mask = 15,
|
|
[0] = "beqB", "bneB", "bhsB", "bloB", "bmiB", "bplB", "bvsB", "bvcB",
|
|
"bhiB", "blsB", "bgeB", "bltB", "bgtB", "bleB", "balB"
|
|
}
|
|
}
|
|
}, false, "blB",
|
|
{ -- Compare & branch, immediate.
|
|
shift = 24, mask = 3,
|
|
[0] = "cbzDBg", "cbnzDBg", "tbzDTBx", "tbnzDTBx"
|
|
},
|
|
{
|
|
shift = 24, mask = 3,
|
|
[0] = { -- Exception generation.
|
|
shift = 0, mask = 0xe0001f,
|
|
[0x200000] = "brkW"
|
|
},
|
|
{ -- System instructions.
|
|
shift = 0, mask = 0x3fffff,
|
|
[0x03201f] = "nop"
|
|
},
|
|
{ -- Unconditional branch, register.
|
|
shift = 0, mask = 0xfffc1f,
|
|
[0x1f0000] = "brNx", [0x3f0000] = "blrNx",
|
|
[0x5f0000] = "retNx"
|
|
},
|
|
}
|
|
}
|
|
|
|
local map_init = {
|
|
shift = 25, mask = 15,
|
|
[0] = false, false, false, false, map_ls, map_datar, map_ls, map_datafp,
|
|
map_datai, map_datai, map_br, map_br, map_ls, map_datar, map_ls, map_datafp
|
|
}
|
|
|
|
------------------------------------------------------------------------------
|
|
|
|
local map_regs = { x = {}, w = {}, d = {}, s = {} }
|
|
|
|
for i=0,30 do
|
|
map_regs.x[i] = "x"..i
|
|
map_regs.w[i] = "w"..i
|
|
map_regs.d[i] = "d"..i
|
|
map_regs.s[i] = "s"..i
|
|
end
|
|
map_regs.x[31] = "sp"
|
|
map_regs.w[31] = "wsp"
|
|
map_regs.d[31] = "d31"
|
|
map_regs.s[31] = "s31"
|
|
|
|
local map_cond = {
|
|
[0] = "eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc",
|
|
"hi", "ls", "ge", "lt", "gt", "le", "al",
|
|
}
|
|
|
|
local map_shift = { [0] = "lsl", "lsr", "asr", }
|
|
|
|
local map_extend = {
|
|
[0] = "uxtb", "uxth", "uxtw", "uxtx", "sxtb", "sxth", "sxtw", "sxtx",
|
|
}
|
|
|
|
------------------------------------------------------------------------------
|
|
|
|
-- Output a nicely formatted line with an opcode and operands.
|
|
local function putop(ctx, text, operands)
|
|
local pos = ctx.pos
|
|
local extra = ""
|
|
if ctx.rel then
|
|
local sym = ctx.symtab[ctx.rel]
|
|
if sym then
|
|
extra = "\t->"..sym
|
|
end
|
|
end
|
|
if ctx.hexdump > 0 then
|
|
ctx.out(format("%08x %s %-5s %s%s\n",
|
|
ctx.addr+pos, tohex(ctx.op), text, concat(operands, ", "), extra))
|
|
else
|
|
ctx.out(format("%08x %-5s %s%s\n",
|
|
ctx.addr+pos, text, concat(operands, ", "), extra))
|
|
end
|
|
ctx.pos = pos + 4
|
|
end
|
|
|
|
-- Fallback for unknown opcodes.
|
|
local function unknown(ctx)
|
|
return putop(ctx, ".long", { "0x"..tohex(ctx.op) })
|
|
end
|
|
|
|
local function match_reg(p, pat, regnum)
|
|
return map_regs[match(pat, p.."%w-([xwds])")][regnum]
|
|
end
|
|
|
|
local function fmt_hex32(x)
|
|
if x < 0 then
|
|
return tohex(x)
|
|
else
|
|
return format("%x", x)
|
|
end
|
|
end
|
|
|
|
local imm13_rep = { 0x55555555, 0x11111111, 0x01010101, 0x00010001, 0x00000001 }
|
|
|
|
local function decode_imm13(op)
|
|
local imms = band(rshift(op, 10), 63)
|
|
local immr = band(rshift(op, 16), 63)
|
|
if band(op, 0x00400000) == 0 then
|
|
local len = 5
|
|
if imms >= 56 then
|
|
if imms >= 60 then len = 1 else len = 2 end
|
|
elseif imms >= 48 then len = 3 elseif imms >= 32 then len = 4 end
|
|
local l = lshift(1, len)-1
|
|
local s = band(imms, l)
|
|
local r = band(immr, l)
|
|
local imm = ror(rshift(-1, 31-s), r)
|
|
if len ~= 5 then imm = band(imm, lshift(1, l)-1) + rshift(imm, 31-l) end
|
|
imm = imm * imm13_rep[len]
|
|
local ix = fmt_hex32(imm)
|
|
if rshift(op, 31) ~= 0 then
|
|
return ix..tohex(imm)
|
|
else
|
|
return ix
|
|
end
|
|
else
|
|
local lo, hi = -1, 0
|
|
if imms < 32 then lo = rshift(-1, 31-imms) else hi = rshift(-1, 63-imms) end
|
|
if immr ~= 0 then
|
|
lo, hi = ror(lo, immr), ror(hi, immr)
|
|
local x = immr == 32 and 0 or band(bxor(lo, hi), lshift(-1, 32-immr))
|
|
lo, hi = bxor(lo, x), bxor(hi, x)
|
|
if immr >= 32 then lo, hi = hi, lo end
|
|
end
|
|
if hi ~= 0 then
|
|
return fmt_hex32(hi)..tohex(lo)
|
|
else
|
|
return fmt_hex32(lo)
|
|
end
|
|
end
|
|
end
|
|
|
|
local function parse_immpc(op, name)
|
|
if name == "b" or name == "bl" then
|
|
return arshift(lshift(op, 6), 4)
|
|
elseif name == "adr" or name == "adrp" then
|
|
local immlo = band(rshift(op, 29), 3)
|
|
local immhi = lshift(arshift(lshift(op, 8), 13), 2)
|
|
return bor(immhi, immlo)
|
|
elseif name == "tbz" or name == "tbnz" then
|
|
return lshift(arshift(lshift(op, 13), 18), 2)
|
|
else
|
|
return lshift(arshift(lshift(op, 8), 13), 2)
|
|
end
|
|
end
|
|
|
|
local function parse_fpimm8(op)
|
|
local sign = band(op, 0x100000) == 0 and 1 or -1
|
|
local exp = bxor(rshift(arshift(lshift(op, 12), 5), 24), 0x80) - 131
|
|
local frac = 16+band(rshift(op, 13), 15)
|
|
return sign * frac * 2^exp
|
|
end
|
|
|
|
local function prefer_bfx(sf, uns, imms, immr)
|
|
if imms < immr or imms == 31 or imms == 63 then
|
|
return false
|
|
end
|
|
if immr == 0 then
|
|
if sf == 0 and (imms == 7 or imms == 15) then
|
|
return false
|
|
end
|
|
if sf ~= 0 and uns == 0 and (imms == 7 or imms == 15 or imms == 31) then
|
|
return false
|
|
end
|
|
end
|
|
return true
|
|
end
|
|
|
|
-- Disassemble a single instruction.
|
|
local function disass_ins(ctx)
|
|
local pos = ctx.pos
|
|
local b0, b1, b2, b3 = byte(ctx.code, pos+1, pos+4)
|
|
local op = bor(lshift(b3, 24), lshift(b2, 16), lshift(b1, 8), b0)
|
|
local operands = {}
|
|
local suffix = ""
|
|
local last, name, pat
|
|
local map_reg
|
|
ctx.op = op
|
|
ctx.rel = nil
|
|
last = nil
|
|
local opat
|
|
opat = map_init[band(rshift(op, 25), 15)]
|
|
while type(opat) ~= "string" do
|
|
if not opat then return unknown(ctx) end
|
|
opat = opat[band(rshift(op, opat.shift), opat.mask)] or opat._
|
|
end
|
|
name, pat = match(opat, "^([a-z0-9]*)(.*)")
|
|
local altname, pat2 = match(pat, "|([a-z0-9_.|]*)(.*)")
|
|
if altname then pat = pat2 end
|
|
if sub(pat, 1, 1) == "." then
|
|
local s2, p2 = match(pat, "^([a-z0-9.]*)(.*)")
|
|
suffix = suffix..s2
|
|
pat = p2
|
|
end
|
|
|
|
local rt = match(pat, "[gf]")
|
|
if rt then
|
|
if rt == "g" then
|
|
map_reg = band(op, 0x80000000) ~= 0 and map_regs.x or map_regs.w
|
|
else
|
|
map_reg = band(op, 0x400000) ~= 0 and map_regs.d or map_regs.s
|
|
end
|
|
end
|
|
|
|
local second0, immr
|
|
|
|
for p in gmatch(pat, ".") do
|
|
local x = nil
|
|
if p == "D" then
|
|
local regnum = band(op, 31)
|
|
x = rt and map_reg[regnum] or match_reg(p, pat, regnum)
|
|
elseif p == "N" then
|
|
local regnum = band(rshift(op, 5), 31)
|
|
x = rt and map_reg[regnum] or match_reg(p, pat, regnum)
|
|
elseif p == "M" then
|
|
local regnum = band(rshift(op, 16), 31)
|
|
x = rt and map_reg[regnum] or match_reg(p, pat, regnum)
|
|
elseif p == "A" then
|
|
local regnum = band(rshift(op, 10), 31)
|
|
x = rt and map_reg[regnum] or match_reg(p, pat, regnum)
|
|
elseif p == "B" then
|
|
local addr = ctx.addr + pos + parse_immpc(op, name)
|
|
ctx.rel = addr
|
|
x = "0x"..tohex(addr)
|
|
elseif p == "T" then
|
|
x = bor(band(rshift(op, 26), 32), band(rshift(op, 19), 31))
|
|
elseif p == "V" then
|
|
x = band(op, 15)
|
|
elseif p == "C" then
|
|
x = map_cond[band(rshift(op, 12), 15)]
|
|
elseif p == "c" then
|
|
local rn = band(rshift(op, 5), 31)
|
|
local rm = band(rshift(op, 16), 31)
|
|
local cond = band(rshift(op, 12), 15)
|
|
local invc = bxor(cond, 1)
|
|
x = map_cond[cond]
|
|
if altname and cond ~= 14 and cond ~= 15 then
|
|
local a1, a2 = match(altname, "([^|]*)|(.*)")
|
|
if rn == rm then
|
|
local n = #operands
|
|
operands[n] = nil
|
|
x = map_cond[invc]
|
|
if rn ~= 31 then
|
|
if a1 then name = a1 else name = altname end
|
|
else
|
|
operands[n-1] = nil
|
|
name = a2
|
|
end
|
|
end
|
|
end
|
|
elseif p == "W" then
|
|
x = band(rshift(op, 5), 0xffff)
|
|
elseif p == "Y" then
|
|
x = band(rshift(op, 5), 0xffff)
|
|
local hw = band(rshift(op, 21), 3)
|
|
if altname and (hw == 0 or x ~= 0) then
|
|
name = altname
|
|
end
|
|
elseif p == "L" then
|
|
local rn = map_regs.x[band(rshift(op, 5), 31)]
|
|
local imm9 = arshift(lshift(op, 11), 23)
|
|
if band(op, 0x800) ~= 0 then
|
|
x = "["..rn..", #"..imm9.."]!"
|
|
else
|
|
x = "["..rn.."], #"..imm9
|
|
end
|
|
elseif p == "U" then
|
|
local rn = map_regs.x[band(rshift(op, 5), 31)]
|
|
local sz = band(rshift(op, 30), 3)
|
|
local imm12 = lshift(arshift(lshift(op, 10), 20), sz)
|
|
if imm12 ~= 0 then
|
|
x = "["..rn..", #"..imm12.."]"
|
|
else
|
|
x = "["..rn.."]"
|
|
end
|
|
elseif p == "K" then
|
|
local rn = map_regs.x[band(rshift(op, 5), 31)]
|
|
local imm9 = arshift(lshift(op, 11), 23)
|
|
if imm9 ~= 0 then
|
|
x = "["..rn..", #"..imm9.."]"
|
|
else
|
|
x = "["..rn.."]"
|
|
end
|
|
elseif p == "O" then
|
|
local rn, rm = map_regs.x[band(rshift(op, 5), 31)]
|
|
local m = band(rshift(op, 13), 1)
|
|
if m == 0 then
|
|
rm = map_regs.w[band(rshift(op, 16), 31)]
|
|
else
|
|
rm = map_regs.x[band(rshift(op, 16), 31)]
|
|
end
|
|
x = "["..rn..", "..rm
|
|
local opt = band(rshift(op, 13), 7)
|
|
local s = band(rshift(op, 12), 1)
|
|
local sz = band(rshift(op, 30), 3)
|
|
-- extension to be applied
|
|
if opt == 3 then
|
|
if s == 0 then x = x.."]"
|
|
else x = x..", lsl #"..sz.."]" end
|
|
elseif opt == 2 or opt == 6 or opt == 7 then
|
|
if s == 0 then x = x..", "..map_extend[opt].."]"
|
|
else x = x..", "..map_extend[opt].." #"..sz.."]" end
|
|
else
|
|
x = x.."]"
|
|
end
|
|
elseif p == "P" then
|
|
local opcv, sh = rshift(op, 26), 2
|
|
if opcv >= 0x2a then sh = 4 elseif opcv >= 0x1b then sh = 3 end
|
|
local imm7 = lshift(arshift(lshift(op, 10), 25), sh)
|
|
local rn = map_regs.x[band(rshift(op, 5), 31)]
|
|
local ind = band(rshift(op, 23), 3)
|
|
if ind == 1 then
|
|
x = "["..rn.."], #"..imm7
|
|
elseif ind == 2 then
|
|
if imm7 == 0 then
|
|
x = "["..rn.."]"
|
|
else
|
|
x = "["..rn..", #"..imm7.."]"
|
|
end
|
|
elseif ind == 3 then
|
|
x = "["..rn..", #"..imm7.."]!"
|
|
end
|
|
elseif p == "I" then
|
|
local shf = band(rshift(op, 22), 3)
|
|
local imm12 = band(rshift(op, 10), 0x0fff)
|
|
local rn, rd = band(rshift(op, 5), 31), band(op, 31)
|
|
if altname == "mov" and shf == 0 and imm12 == 0 and (rn == 31 or rd == 31) then
|
|
name = altname
|
|
x = nil
|
|
elseif shf == 0 then
|
|
x = imm12
|
|
elseif shf == 1 then
|
|
x = imm12..", lsl #12"
|
|
end
|
|
elseif p == "i" then
|
|
x = "#0x"..decode_imm13(op)
|
|
elseif p == "1" then
|
|
immr = band(rshift(op, 16), 63)
|
|
x = immr
|
|
elseif p == "2" then
|
|
x = band(rshift(op, 10), 63)
|
|
if altname then
|
|
local a1, a2, a3, a4, a5, a6 =
|
|
match(altname, "([^|]*)|([^|]*)|([^|]*)|([^|]*)|([^|]*)|(.*)")
|
|
local sf = band(rshift(op, 26), 32)
|
|
local uns = band(rshift(op, 30), 1)
|
|
if prefer_bfx(sf, uns, x, immr) then
|
|
name = a2
|
|
x = x - immr + 1
|
|
elseif immr == 0 and x == 7 then
|
|
local n = #operands
|
|
operands[n] = nil
|
|
if sf ~= 0 then
|
|
operands[n-1] = gsub(operands[n-1], "x", "w")
|
|
end
|
|
last = operands[n-1]
|
|
name = a6
|
|
x = nil
|
|
elseif immr == 0 and x == 15 then
|
|
local n = #operands
|
|
operands[n] = nil
|
|
if sf ~= 0 then
|
|
operands[n-1] = gsub(operands[n-1], "x", "w")
|
|
end
|
|
last = operands[n-1]
|
|
name = a5
|
|
x = nil
|
|
elseif x == 31 or x == 63 then
|
|
if x == 31 and immr == 0 and name == "sbfm" then
|
|
name = a4
|
|
local n = #operands
|
|
operands[n] = nil
|
|
if sf ~= 0 then
|
|
operands[n-1] = gsub(operands[n-1], "x", "w")
|
|
end
|
|
last = operands[n-1]
|
|
else
|
|
name = a3
|
|
end
|
|
x = nil
|
|
elseif band(x, 31) ~= 31 and immr == x+1 and name == "ubfm" then
|
|
name = a4
|
|
last = "#"..(sf+32 - immr)
|
|
operands[#operands] = last
|
|
x = nil
|
|
elseif x < immr then
|
|
name = a1
|
|
last = "#"..(sf+32 - immr)
|
|
operands[#operands] = last
|
|
x = x + 1
|
|
end
|
|
end
|
|
elseif p == "3" then
|
|
x = band(rshift(op, 10), 63)
|
|
if altname then
|
|
local a1, a2 = match(altname, "([^|]*)|(.*)")
|
|
if x < immr then
|
|
name = a1
|
|
local sf = band(rshift(op, 26), 32)
|
|
last = "#"..(sf+32 - immr)
|
|
operands[#operands] = last
|
|
x = x + 1
|
|
elseif x >= immr then
|
|
name = a2
|
|
x = x - immr + 1
|
|
end
|
|
end
|
|
elseif p == "4" then
|
|
x = band(rshift(op, 10), 63)
|
|
local rn = band(rshift(op, 5), 31)
|
|
local rm = band(rshift(op, 16), 31)
|
|
if altname and rn == rm then
|
|
local n = #operands
|
|
operands[n] = nil
|
|
last = operands[n-1]
|
|
name = altname
|
|
end
|
|
elseif p == "5" then
|
|
x = band(rshift(op, 16), 31)
|
|
elseif p == "S" then
|
|
x = band(rshift(op, 10), 63)
|
|
if x == 0 then x = nil
|
|
else x = map_shift[band(rshift(op, 22), 3)].." #"..x end
|
|
elseif p == "X" then
|
|
local opt = band(rshift(op, 13), 7)
|
|
-- Width specifier <R>.
|
|
if opt ~= 3 and opt ~= 7 then
|
|
last = map_regs.w[band(rshift(op, 16), 31)]
|
|
operands[#operands] = last
|
|
end
|
|
x = band(rshift(op, 10), 7)
|
|
-- Extension.
|
|
if opt == 2 + band(rshift(op, 31), 1) and
|
|
band(rshift(op, second0 and 5 or 0), 31) == 31 then
|
|
if x == 0 then x = nil
|
|
else x = "lsl #"..x end
|
|
else
|
|
if x == 0 then x = map_extend[band(rshift(op, 13), 7)]
|
|
else x = map_extend[band(rshift(op, 13), 7)].." #"..x end
|
|
end
|
|
elseif p == "R" then
|
|
x = band(rshift(op,21), 3)
|
|
if x == 0 then x = nil
|
|
else x = "lsl #"..x*16 end
|
|
elseif p == "z" then
|
|
local n = #operands
|
|
if operands[n] == "sp" then operands[n] = "xzr"
|
|
elseif operands[n] == "wsp" then operands[n] = "wzr"
|
|
end
|
|
elseif p == "Z" then
|
|
x = 0
|
|
elseif p == "F" then
|
|
x = parse_fpimm8(op)
|
|
elseif p == "g" or p == "f" or p == "x" or p == "w" or
|
|
p == "d" or p == "s" then
|
|
-- These are handled in D/N/M/A.
|
|
elseif p == "0" then
|
|
if last == "sp" or last == "wsp" then
|
|
local n = #operands
|
|
operands[n] = nil
|
|
last = operands[n-1]
|
|
if altname then
|
|
local a1, a2 = match(altname, "([^|]*)|(.*)")
|
|
if not a1 then
|
|
name = altname
|
|
elseif second0 then
|
|
name, altname = a2, a1
|
|
else
|
|
name, altname = a1, a2
|
|
end
|
|
end
|
|
end
|
|
second0 = true
|
|
else
|
|
assert(false)
|
|
end
|
|
if x then
|
|
last = x
|
|
if type(x) == "number" then x = "#"..x end
|
|
operands[#operands+1] = x
|
|
end
|
|
end
|
|
|
|
return putop(ctx, name..suffix, operands)
|
|
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
|
|
ctx.pos = ofs
|
|
ctx.rel = nil
|
|
while ctx.pos < stop do disass_ins(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
|
|
ctx.out = out or io.write
|
|
ctx.symtab = {}
|
|
ctx.disass = disass_block
|
|
ctx.hexdump = 8
|
|
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
|
|
|
|
-- Return register name for RID.
|
|
local function regname(r)
|
|
if r < 32 then return map_regs.x[r] end
|
|
return map_regs.d[r-32]
|
|
end
|
|
|
|
-- Public module functions.
|
|
return {
|
|
create = create,
|
|
disass = disass,
|
|
regname = regname
|
|
}
|
|
|