ok
Mini Shell
----------------------------------------------------------------------------
-- LuaJIT ARM64 disassembler module.
--
-- Copyright (C) 2005-2022 Mike Pall. All rights reserved.
-- Released under the MIT license. See Copyright Notice in luajit.h
--
-- Contributed by Djordje Kovacevic and Stefan Pejic from RT-RK.com.
-- Sponsored by Cisco Systems, Inc.
----------------------------------------------------------------------------
-- This is a helper module used by the LuaJIT machine code dumper module.
--
-- It disassembles most user-mode AArch64 instructions.
-- NYI: Advanced SIMD and VFP instructions.
------------------------------------------------------------------------------
local type = type
local sub, byte, format = string.sub, string.byte, string.format
local match, gmatch, gsub = string.match, string.gmatch, string.gsub
local concat = table.concat
local bit = require("bit")
local band, bor, bxor, tohex = bit.band, bit.bor, bit.bxor, bit.tohex
local lshift, rshift, arshift = bit.lshift, bit.rshift, bit.arshift
local ror = bit.ror
------------------------------------------------------------------------------
-- Opcode maps
------------------------------------------------------------------------------
local map_adr = { -- PC-relative addressing.
shift = 31, mask = 1,
[0] = "adrDBx", "adrpDBx"
}
local map_addsubi = { -- Add/subtract immediate.
shift = 29, mask = 3,
[0] = "add|movDNIg", "adds|cmnD0NIg", "subDNIg", "subs|cmpD0NIg",
}
local map_logi = { -- Logical immediate.
shift = 31, mask = 1,
[0] = {
shift = 22, mask = 1,
[0] = {
shift = 29, mask = 3,
[0] = "andDNig", "orr|movDN0ig", "eorDNig", "ands|tstD0Nig"
},
false -- unallocated
},
{
shift = 29, mask = 3,
[0] = "andDNig", "orr|movDN0ig", "eorDNig", "ands|tstD0Nig"
}
}
local map_movwi = { -- Move wide immediate.
shift = 31, mask = 1,
[0] = {
shift = 22, mask = 1,
[0] = {
shift = 29, mask = 3,
[0] = "movnDWRg", false, "movz|movDYRg", "movkDWRg"
}, false -- unallocated
},
{
shift = 29, mask = 3,
[0] = "movnDWRg", false, "movz|movDYRg", "movkDWRg"
},
}
local map_bitf = { -- Bitfield.
shift = 31, mask = 1,
[0] = {
shift = 22, mask = 1,
[0] = {
shift = 29, mask = 3,
[0] = "sbfm|sbfiz|sbfx|asr|sxtw|sxth|sxtbDN12w",
"bfm|bfi|bfxilDN13w",
"ubfm|ubfiz|ubfx|lsr|lsl|uxth|uxtbDN12w"
}
},
{
shift = 22, mask = 1,
{
shift = 29, mask = 3,
[0] = "sbfm|sbfiz|sbfx|asr|sxtw|sxth|sxtbDN12x",
"bfm|bfi|bfxilDN13x",
"ubfm|ubfiz|ubfx|lsr|lsl|uxth|uxtbDN12x"
}
}
}
local map_datai = { -- Data processing - immediate.
shift = 23, mask = 7,
[0] = map_adr, map_adr, map_addsubi, false,
map_logi, map_movwi, map_bitf,
{
shift = 15, mask = 0x1c0c1,
[0] = "extr|rorDNM4w", [0x10080] = "extr|rorDNM4x",
[0x10081] = "extr|rorDNM4x"
}
}
local map_logsr = { -- Logical, shifted register.
shift = 31, mask = 1,
[0] = {
shift = 15, mask = 1,
[0] = {
shift = 29, mask = 3,
[0] = {
shift = 21, mask = 7,
[0] = "andDNMSg", "bicDNMSg", "andDNMSg", "bicDNMSg",
"andDNMSg", "bicDNMSg", "andDNMg", "bicDNMg"
},
{
shift = 21, mask = 7,
[0] ="orr|movDN0MSg", "orn|mvnDN0MSg", "orr|movDN0MSg", "orn|mvnDN0MSg",
"orr|movDN0MSg", "orn|mvnDN0MSg", "orr|movDN0Mg", "orn|mvnDN0Mg"
},
{
shift = 21, mask = 7,
[0] = "eorDNMSg", "eonDNMSg", "eorDNMSg", "eonDNMSg",
"eorDNMSg", "eonDNMSg", "eorDNMg", "eonDNMg"
},
{
shift = 21, mask = 7,
[0] = "ands|tstD0NMSg", "bicsDNMSg", "ands|tstD0NMSg", "bicsDNMSg",
"ands|tstD0NMSg", "bicsDNMSg", "ands|tstD0NMg", "bicsDNMg"
}
},
false -- unallocated
},
{
shift = 29, mask = 3,
[0] = {
shift = 21, mask = 7,
[0] = "andDNMSg", "bicDNMSg", "andDNMSg", "bicDNMSg",
"andDNMSg", "bicDNMSg", "andDNMg", "bicDNMg"
},
{
shift = 21, mask = 7,
[0] = "orr|movDN0MSg", "orn|mvnDN0MSg", "orr|movDN0MSg", "orn|mvnDN0MSg",
"orr|movDN0MSg", "orn|mvnDN0MSg", "orr|movDN0Mg", "orn|mvnDN0Mg"
},
{
shift = 21, mask = 7,
[0] = "eorDNMSg", "eonDNMSg", "eorDNMSg", "eonDNMSg",
"eorDNMSg", "eonDNMSg", "eorDNMg", "eonDNMg"
},
{
shift = 21, mask = 7,
[0] = "ands|tstD0NMSg", "bicsDNMSg", "ands|tstD0NMSg", "bicsDNMSg",
"ands|tstD0NMSg", "bicsDNMSg", "ands|tstD0NMg", "bicsDNMg"
}
}
}
local map_assh = {
shift = 31, mask = 1,
[0] = {
shift = 15, mask = 1,
[0] = {
shift = 29, mask = 3,
[0] = {
shift = 22, mask = 3,
[0] = "addDNMSg", "addDNMSg", "addDNMSg", "addDNMg"
},
{
shift = 22, mask = 3,
[0] = "adds|cmnD0NMSg", "adds|cmnD0NMSg",
"adds|cmnD0NMSg", "adds|cmnD0NMg"
},
{
shift = 22, mask = 3,
[0] = "sub|negDN0MSg", "sub|negDN0MSg", "sub|negDN0MSg", "sub|negDN0Mg"
},
{
shift = 22, mask = 3,
[0] = "subs|cmp|negsD0N0MzSg", "subs|cmp|negsD0N0MzSg",
"subs|cmp|negsD0N0MzSg", "subs|cmp|negsD0N0Mzg"
},
},
false -- unallocated
},
{
shift = 29, mask = 3,
[0] = {
shift = 22, mask = 3,
[0] = "addDNMSg", "addDNMSg", "addDNMSg", "addDNMg"
},
{
shift = 22, mask = 3,
[0] = "adds|cmnD0NMSg", "adds|cmnD0NMSg", "adds|cmnD0NMSg",
"adds|cmnD0NMg"
},
{
shift = 22, mask = 3,
[0] = "sub|negDN0MSg", "sub|negDN0MSg", "sub|negDN0MSg", "sub|negDN0Mg"
},
{
shift = 22, mask = 3,
[0] = "subs|cmp|negsD0N0MzSg", "subs|cmp|negsD0N0MzSg",
"subs|cmp|negsD0N0MzSg", "subs|cmp|negsD0N0Mzg"
}
}
}
local map_addsubsh = { -- Add/subtract, shifted register.
shift = 22, mask = 3,
[0] = map_assh, map_assh, map_assh
}
local map_addsubex = { -- Add/subtract, extended register.
shift = 22, mask = 3,
[0] = {
shift = 29, mask = 3,
[0] = "addDNMXg", "adds|cmnD0NMXg", "subDNMXg", "subs|cmpD0NMzXg",
}
}
local map_addsubc = { -- Add/subtract, with carry.
shift = 10, mask = 63,
[0] = {
shift = 29, mask = 3,
[0] = "adcDNMg", "adcsDNMg", "sbc|ngcDN0Mg", "sbcs|ngcsDN0Mg",
}
}
local map_ccomp = {
shift = 4, mask = 1,
[0] = {
shift = 10, mask = 3,
[0] = { -- Conditional compare register.
shift = 29, mask = 3,
"ccmnNMVCg", false, "ccmpNMVCg",
},
[2] = { -- Conditional compare immediate.
shift = 29, mask = 3,
"ccmnN5VCg", false, "ccmpN5VCg",
}
}
}
local map_csel = { -- Conditional select.
shift = 11, mask = 1,
[0] = {
shift = 10, mask = 1,
[0] = {
shift = 29, mask = 3,
[0] = "cselDNMzCg", false, "csinv|cinv|csetmDNMcg", false,
},
{
shift = 29, mask = 3,
[0] = "csinc|cinc|csetDNMcg", false, "csneg|cnegDNMcg", false,
}
}
}
local map_data1s = { -- Data processing, 1 source.
shift = 29, mask = 1,
[0] = {
shift = 31, mask = 1,
[0] = {
shift = 10, mask = 0x7ff,
[0] = "rbitDNg", "rev16DNg", "revDNw", false, "clzDNg", "clsDNg"
},
{
shift = 10, mask = 0x7ff,
[0] = "rbitDNg", "rev16DNg", "rev32DNx", "revDNx", "clzDNg", "clsDNg"
}
}
}
local map_data2s = { -- Data processing, 2 sources.
shift = 29, mask = 1,
[0] = {
shift = 10, mask = 63,
false, "udivDNMg", "sdivDNMg", false, false, false, false, "lslDNMg",
"lsrDNMg", "asrDNMg", "rorDNMg"
}
}
local map_data3s = { -- Data processing, 3 sources.
shift = 29, mask = 7,
[0] = {
shift = 21, mask = 7,
[0] = {
shift = 15, mask = 1,
[0] = "madd|mulDNMA0g", "msub|mnegDNMA0g"
}
}, false, false, false,
{
shift = 15, mask = 1,
[0] = {
shift = 21, mask = 7,
[0] = "madd|mulDNMA0g", "smaddl|smullDxNMwA0x", "smulhDNMx", false,
false, "umaddl|umullDxNMwA0x", "umulhDNMx"
},
{
shift = 21, mask = 7,
[0] = "msub|mnegDNMA0g", "smsubl|smneglDxNMwA0x", false, false,
false, "umsubl|umneglDxNMwA0x"
}
}
}
local map_datar = { -- Data processing, register.
shift = 28, mask = 1,
[0] = {
shift = 24, mask = 1,
[0] = map_logsr,
{
shift = 21, mask = 1,
[0] = map_addsubsh, map_addsubex
}
},
{
shift = 21, mask = 15,
[0] = map_addsubc, false, map_ccomp, false, map_csel, false,
{
shift = 30, mask = 1,
[0] = map_data2s, map_data1s
},
false, map_data3s, map_data3s, map_data3s, map_data3s, map_data3s,
map_data3s, map_data3s, map_data3s
}
}
local map_lrl = { -- Load register, literal.
shift = 26, mask = 1,
[0] = {
shift = 30, mask = 3,
[0] = "ldrDwB", "ldrDxB", "ldrswDxB"
},
{
shift = 30, mask = 3,
[0] = "ldrDsB", "ldrDdB"
}
}
local map_lsriind = { -- Load/store register, immediate pre/post-indexed.
shift = 30, mask = 3,
[0] = {
shift = 26, mask = 1,
[0] = {
shift = 22, mask = 3,
[0] = "strbDwzL", "ldrbDwzL", "ldrsbDxzL", "ldrsbDwzL"
}
},
{
shift = 26, mask = 1,
[0] = {
shift = 22, mask = 3,
[0] = "strhDwzL", "ldrhDwzL", "ldrshDxzL", "ldrshDwzL"
}
},
{
shift = 26, mask = 1,
[0] = {
shift = 22, mask = 3,
[0] = "strDwzL", "ldrDwzL", "ldrswDxzL"
},
{
shift = 22, mask = 3,
[0] = "strDszL", "ldrDszL"
}
},
{
shift = 26, mask = 1,
[0] = {
shift = 22, mask = 3,
[0] = "strDxzL", "ldrDxzL"
},
{
shift = 22, mask = 3,
[0] = "strDdzL", "ldrDdzL"
}
}
}
local map_lsriro = {
shift = 21, mask = 1,
[0] = { -- Load/store register immediate.
shift = 10, mask = 3,
[0] = { -- Unscaled immediate.
shift = 26, mask = 1,
[0] = {
shift = 30, mask = 3,
[0] = {
shift = 22, mask = 3,
[0] = "sturbDwK", "ldurbDwK"
},
{
shift = 22, mask = 3,
[0] = "sturhDwK", "ldurhDwK"
},
{
shift = 22, mask = 3,
[0] = "sturDwK", "ldurDwK"
},
{
shift = 22, mask = 3,
[0] = "sturDxK", "ldurDxK"
}
}
}, map_lsriind, false, map_lsriind
},
{ -- Load/store register, register offset.
shift = 10, mask = 3,
[2] = {
shift = 26, mask = 1,
[0] = {
shift = 30, mask = 3,
[0] = {
shift = 22, mask = 3,
[0] = "strbDwO", "ldrbDwO", "ldrsbDxO", "ldrsbDwO"
},
{
shift = 22, mask = 3,
[0] = "strhDwO", "ldrhDwO", "ldrshDxO", "ldrshDwO"
},
{
shift = 22, mask = 3,
[0] = "strDwO", "ldrDwO", "ldrswDxO"
},
{
shift = 22, mask = 3,
[0] = "strDxO", "ldrDxO"
}
},
{
shift = 30, mask = 3,
[2] = {
shift = 22, mask = 3,
[0] = "strDsO", "ldrDsO"
},
[3] = {
shift = 22, mask = 3,
[0] = "strDdO", "ldrDdO"
}
}
}
}
}
local map_lsp = { -- Load/store register pair, offset.
shift = 22, mask = 1,
[0] = {
shift = 30, mask = 3,
[0] = {
shift = 26, mask = 1,
[0] = "stpDzAzwP", "stpDzAzsP",
},
{
shift = 26, mask = 1,
"stpDzAzdP"
},
{
shift = 26, mask = 1,
[0] = "stpDzAzxP"
}
},
{
shift = 30, mask = 3,
[0] = {
shift = 26, mask = 1,
[0] = "ldpDzAzwP", "ldpDzAzsP",
},
{
shift = 26, mask = 1,
[0] = "ldpswDAxP", "ldpDzAzdP"
},
{
shift = 26, mask = 1,
[0] = "ldpDzAzxP"
}
}
}
local map_ls = { -- Loads and stores.
shift = 24, mask = 0x31,
[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
else
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
}
Zerion Mini Shell 1.0