ok
Mini Shell
----------------------------------------------------------------------------
-- LuaJIT MIPS disassembler module.
--
-- Copyright (C) 2005-2022 Mike Pall. All rights reserved.
-- Released under the MIT/X license. See Copyright Notice in luajit.h
----------------------------------------------------------------------------
-- This is a helper module used by the LuaJIT machine code dumper module.
--
-- It disassembles all standard MIPS32R1/R2 instructions.
-- Default mode is big-endian, but see: dis_mipsel.lua
------------------------------------------------------------------------------
local type = type
local byte, format = string.byte, string.format
local match, gmatch = string.match, string.gmatch
local concat = table.concat
local bit = require("bit")
local band, bor, tohex = bit.band, bit.bor, bit.tohex
local lshift, rshift, arshift = bit.lshift, bit.rshift, bit.arshift
------------------------------------------------------------------------------
-- Extended opcode maps common to all MIPS releases
------------------------------------------------------------------------------
local map_srl = { shift = 21, mask = 1, [0] = "srlDTA", "rotrDTA", }
local map_srlv = { shift = 6, mask = 1, [0] = "srlvDTS", "rotrvDTS", }
local map_cop0 = {
shift = 25, mask = 1,
[0] = {
shift = 21, mask = 15,
[0] = "mfc0TDW", [4] = "mtc0TDW",
[10] = "rdpgprDT",
[11] = { shift = 5, mask = 1, [0] = "diT0", "eiT0", },
[14] = "wrpgprDT",
}, {
shift = 0, mask = 63,
[1] = "tlbr", [2] = "tlbwi", [6] = "tlbwr", [8] = "tlbp",
[24] = "eret", [31] = "deret",
[32] = "wait",
},
}
------------------------------------------------------------------------------
-- Primary and extended opcode maps for MIPS R1-R5
------------------------------------------------------------------------------
local map_movci = { shift = 16, mask = 1, [0] = "movfDSC", "movtDSC", }
local map_special = {
shift = 0, mask = 63,
[0] = { shift = 0, mask = -1, [0] = "nop", _ = "sllDTA" },
map_movci, map_srl, "sraDTA",
"sllvDTS", false, map_srlv, "sravDTS",
"jrS", "jalrD1S", "movzDST", "movnDST",
"syscallY", "breakY", false, "sync",
"mfhiD", "mthiS", "mfloD", "mtloS",
"dsllvDST", false, "dsrlvDST", "dsravDST",
"multST", "multuST", "divST", "divuST",
"dmultST", "dmultuST", "ddivST", "ddivuST",
"addDST", "addu|moveDST0", "subDST", "subu|neguDS0T",
"andDST", "or|moveDST0", "xorDST", "nor|notDST0",
false, false, "sltDST", "sltuDST",
"daddDST", "dadduDST", "dsubDST", "dsubuDST",
"tgeSTZ", "tgeuSTZ", "tltSTZ", "tltuSTZ",
"teqSTZ", false, "tneSTZ", false,
"dsllDTA", false, "dsrlDTA", "dsraDTA",
"dsll32DTA", false, "dsrl32DTA", "dsra32DTA",
}
local map_special2 = {
shift = 0, mask = 63,
[0] = "maddST", "madduST", "mulDST", false,
"msubST", "msubuST",
[32] = "clzDS", [33] = "cloDS",
[63] = "sdbbpY",
}
local map_bshfl = {
shift = 6, mask = 31,
[2] = "wsbhDT",
[16] = "sebDT",
[24] = "sehDT",
}
local map_dbshfl = {
shift = 6, mask = 31,
[2] = "dsbhDT",
[5] = "dshdDT",
}
local map_special3 = {
shift = 0, mask = 63,
[0] = "extTSAK", [1] = "dextmTSAP", [3] = "dextTSAK",
[4] = "insTSAL", [6] = "dinsuTSEQ", [7] = "dinsTSAL",
[32] = map_bshfl, [36] = map_dbshfl, [59] = "rdhwrTD",
}
local map_regimm = {
shift = 16, mask = 31,
[0] = "bltzSB", "bgezSB", "bltzlSB", "bgezlSB",
false, false, false, false,
"tgeiSI", "tgeiuSI", "tltiSI", "tltiuSI",
"teqiSI", false, "tneiSI", false,
"bltzalSB", "bgezalSB", "bltzallSB", "bgezallSB",
false, false, false, false,
false, false, false, false,
false, false, false, "synciSO",
}
local map_cop1s = {
shift = 0, mask = 63,
[0] = "add.sFGH", "sub.sFGH", "mul.sFGH", "div.sFGH",
"sqrt.sFG", "abs.sFG", "mov.sFG", "neg.sFG",
"round.l.sFG", "trunc.l.sFG", "ceil.l.sFG", "floor.l.sFG",
"round.w.sFG", "trunc.w.sFG", "ceil.w.sFG", "floor.w.sFG",
false,
{ shift = 16, mask = 1, [0] = "movf.sFGC", "movt.sFGC" },
"movz.sFGT", "movn.sFGT",
false, "recip.sFG", "rsqrt.sFG", false,
false, false, false, false,
false, false, false, false,
false, "cvt.d.sFG", false, false,
"cvt.w.sFG", "cvt.l.sFG", "cvt.ps.sFGH", false,
false, false, false, false,
false, false, false, false,
"c.f.sVGH", "c.un.sVGH", "c.eq.sVGH", "c.ueq.sVGH",
"c.olt.sVGH", "c.ult.sVGH", "c.ole.sVGH", "c.ule.sVGH",
"c.sf.sVGH", "c.ngle.sVGH", "c.seq.sVGH", "c.ngl.sVGH",
"c.lt.sVGH", "c.nge.sVGH", "c.le.sVGH", "c.ngt.sVGH",
}
local map_cop1d = {
shift = 0, mask = 63,
[0] = "add.dFGH", "sub.dFGH", "mul.dFGH", "div.dFGH",
"sqrt.dFG", "abs.dFG", "mov.dFG", "neg.dFG",
"round.l.dFG", "trunc.l.dFG", "ceil.l.dFG", "floor.l.dFG",
"round.w.dFG", "trunc.w.dFG", "ceil.w.dFG", "floor.w.dFG",
false,
{ shift = 16, mask = 1, [0] = "movf.dFGC", "movt.dFGC" },
"movz.dFGT", "movn.dFGT",
false, "recip.dFG", "rsqrt.dFG", false,
false, false, false, false,
false, false, false, false,
"cvt.s.dFG", false, false, false,
"cvt.w.dFG", "cvt.l.dFG", false, false,
false, false, false, false,
false, false, false, false,
"c.f.dVGH", "c.un.dVGH", "c.eq.dVGH", "c.ueq.dVGH",
"c.olt.dVGH", "c.ult.dVGH", "c.ole.dVGH", "c.ule.dVGH",
"c.df.dVGH", "c.ngle.dVGH", "c.deq.dVGH", "c.ngl.dVGH",
"c.lt.dVGH", "c.nge.dVGH", "c.le.dVGH", "c.ngt.dVGH",
}
local map_cop1ps = {
shift = 0, mask = 63,
[0] = "add.psFGH", "sub.psFGH", "mul.psFGH", false,
false, "abs.psFG", "mov.psFG", "neg.psFG",
false, false, false, false,
false, false, false, false,
false,
{ shift = 16, mask = 1, [0] = "movf.psFGC", "movt.psFGC" },
"movz.psFGT", "movn.psFGT",
false, false, false, false,
false, false, false, false,
false, false, false, false,
"cvt.s.puFG", false, false, false,
false, false, false, false,
"cvt.s.plFG", false, false, false,
"pll.psFGH", "plu.psFGH", "pul.psFGH", "puu.psFGH",
"c.f.psVGH", "c.un.psVGH", "c.eq.psVGH", "c.ueq.psVGH",
"c.olt.psVGH", "c.ult.psVGH", "c.ole.psVGH", "c.ule.psVGH",
"c.psf.psVGH", "c.ngle.psVGH", "c.pseq.psVGH", "c.ngl.psVGH",
"c.lt.psVGH", "c.nge.psVGH", "c.le.psVGH", "c.ngt.psVGH",
}
local map_cop1w = {
shift = 0, mask = 63,
[32] = "cvt.s.wFG", [33] = "cvt.d.wFG",
}
local map_cop1l = {
shift = 0, mask = 63,
[32] = "cvt.s.lFG", [33] = "cvt.d.lFG",
}
local map_cop1bc = {
shift = 16, mask = 3,
[0] = "bc1fCB", "bc1tCB", "bc1flCB", "bc1tlCB",
}
local map_cop1 = {
shift = 21, mask = 31,
[0] = "mfc1TG", "dmfc1TG", "cfc1TG", "mfhc1TG",
"mtc1TG", "dmtc1TG", "ctc1TG", "mthc1TG",
map_cop1bc, false, false, false,
false, false, false, false,
map_cop1s, map_cop1d, false, false,
map_cop1w, map_cop1l, map_cop1ps,
}
local map_cop1x = {
shift = 0, mask = 63,
[0] = "lwxc1FSX", "ldxc1FSX", false, false,
false, "luxc1FSX", false, false,
"swxc1FSX", "sdxc1FSX", false, false,
false, "suxc1FSX", false, "prefxMSX",
false, false, false, false,
false, false, false, false,
false, false, false, false,
false, false, "alnv.psFGHS", false,
"madd.sFRGH", "madd.dFRGH", false, false,
false, false, "madd.psFRGH", false,
"msub.sFRGH", "msub.dFRGH", false, false,
false, false, "msub.psFRGH", false,
"nmadd.sFRGH", "nmadd.dFRGH", false, false,
false, false, "nmadd.psFRGH", false,
"nmsub.sFRGH", "nmsub.dFRGH", false, false,
false, false, "nmsub.psFRGH", false,
}
local map_pri = {
[0] = map_special, map_regimm, "jJ", "jalJ",
"beq|beqz|bST00B", "bne|bnezST0B", "blezSB", "bgtzSB",
"addiTSI", "addiu|liTS0I", "sltiTSI", "sltiuTSI",
"andiTSU", "ori|liTS0U", "xoriTSU", "luiTU",
map_cop0, map_cop1, false, map_cop1x,
"beql|beqzlST0B", "bnel|bnezlST0B", "blezlSB", "bgtzlSB",
"daddiTSI", "daddiuTSI", false, false,
map_special2, "jalxJ", false, map_special3,
"lbTSO", "lhTSO", "lwlTSO", "lwTSO",
"lbuTSO", "lhuTSO", "lwrTSO", false,
"sbTSO", "shTSO", "swlTSO", "swTSO",
false, false, "swrTSO", "cacheNSO",
"llTSO", "lwc1HSO", "lwc2TSO", "prefNSO",
false, "ldc1HSO", "ldc2TSO", "ldTSO",
"scTSO", "swc1HSO", "swc2TSO", false,
false, "sdc1HSO", "sdc2TSO", "sdTSO",
}
------------------------------------------------------------------------------
-- Primary and extended opcode maps for MIPS R6
------------------------------------------------------------------------------
local map_mul_r6 = { shift = 6, mask = 3, [2] = "mulDST", [3] = "muhDST" }
local map_mulu_r6 = { shift = 6, mask = 3, [2] = "muluDST", [3] = "muhuDST" }
local map_div_r6 = { shift = 6, mask = 3, [2] = "divDST", [3] = "modDST" }
local map_divu_r6 = { shift = 6, mask = 3, [2] = "divuDST", [3] = "moduDST" }
local map_dmul_r6 = { shift = 6, mask = 3, [2] = "dmulDST", [3] = "dmuhDST" }
local map_dmulu_r6 = { shift = 6, mask = 3, [2] = "dmuluDST", [3] = "dmuhuDST" }
local map_ddiv_r6 = { shift = 6, mask = 3, [2] = "ddivDST", [3] = "dmodDST" }
local map_ddivu_r6 = { shift = 6, mask = 3, [2] = "ddivuDST", [3] = "dmoduDST" }
local map_special_r6 = {
shift = 0, mask = 63,
[0] = { shift = 0, mask = -1, [0] = "nop", _ = "sllDTA" },
false, map_srl, "sraDTA",
"sllvDTS", false, map_srlv, "sravDTS",
"jrS", "jalrD1S", false, false,
"syscallY", "breakY", false, "sync",
"clzDS", "cloDS", "dclzDS", "dcloDS",
"dsllvDST", "dlsaDSTA", "dsrlvDST", "dsravDST",
map_mul_r6, map_mulu_r6, map_div_r6, map_divu_r6,
map_dmul_r6, map_dmulu_r6, map_ddiv_r6, map_ddivu_r6,
"addDST", "addu|moveDST0", "subDST", "subu|neguDS0T",
"andDST", "or|moveDST0", "xorDST", "nor|notDST0",
false, false, "sltDST", "sltuDST",
"daddDST", "dadduDST", "dsubDST", "dsubuDST",
"tgeSTZ", "tgeuSTZ", "tltSTZ", "tltuSTZ",
"teqSTZ", "seleqzDST", "tneSTZ", "selnezDST",
"dsllDTA", false, "dsrlDTA", "dsraDTA",
"dsll32DTA", false, "dsrl32DTA", "dsra32DTA",
}
local map_bshfl_r6 = {
shift = 9, mask = 3,
[1] = "alignDSTa",
_ = {
shift = 6, mask = 31,
[0] = "bitswapDT",
[2] = "wsbhDT",
[16] = "sebDT",
[24] = "sehDT",
}
}
local map_dbshfl_r6 = {
shift = 9, mask = 3,
[1] = "dalignDSTa",
_ = {
shift = 6, mask = 31,
[0] = "dbitswapDT",
[2] = "dsbhDT",
[5] = "dshdDT",
}
}
local map_special3_r6 = {
shift = 0, mask = 63,
[0] = "extTSAK", [1] = "dextmTSAP", [3] = "dextTSAK",
[4] = "insTSAL", [6] = "dinsuTSEQ", [7] = "dinsTSAL",
[32] = map_bshfl_r6, [36] = map_dbshfl_r6, [59] = "rdhwrTD",
}
local map_regimm_r6 = {
shift = 16, mask = 31,
[0] = "bltzSB", [1] = "bgezSB",
[6] = "dahiSI", [30] = "datiSI",
[23] = "sigrieI", [31] = "synciSO",
}
local map_pcrel_r6 = {
shift = 19, mask = 3,
[0] = "addiupcS2", "lwpcS2", "lwupcS2", {
shift = 18, mask = 1,
[0] = "ldpcS3", { shift = 16, mask = 3, [2] = "auipcSI", [3] = "aluipcSI" }
}
}
local map_cop1s_r6 = {
shift = 0, mask = 63,
[0] = "add.sFGH", "sub.sFGH", "mul.sFGH", "div.sFGH",
"sqrt.sFG", "abs.sFG", "mov.sFG", "neg.sFG",
"round.l.sFG", "trunc.l.sFG", "ceil.l.sFG", "floor.l.sFG",
"round.w.sFG", "trunc.w.sFG", "ceil.w.sFG", "floor.w.sFG",
"sel.sFGH", false, false, false,
"seleqz.sFGH", "recip.sFG", "rsqrt.sFG", "selnez.sFGH",
"maddf.sFGH", "msubf.sFGH", "rint.sFG", "class.sFG",
"min.sFGH", "mina.sFGH", "max.sFGH", "maxa.sFGH",
false, "cvt.d.sFG", false, false,
"cvt.w.sFG", "cvt.l.sFG",
}
local map_cop1d_r6 = {
shift = 0, mask = 63,
[0] = "add.dFGH", "sub.dFGH", "mul.dFGH", "div.dFGH",
"sqrt.dFG", "abs.dFG", "mov.dFG", "neg.dFG",
"round.l.dFG", "trunc.l.dFG", "ceil.l.dFG", "floor.l.dFG",
"round.w.dFG", "trunc.w.dFG", "ceil.w.dFG", "floor.w.dFG",
"sel.dFGH", false, false, false,
"seleqz.dFGH", "recip.dFG", "rsqrt.dFG", "selnez.dFGH",
"maddf.dFGH", "msubf.dFGH", "rint.dFG", "class.dFG",
"min.dFGH", "mina.dFGH", "max.dFGH", "maxa.dFGH",
"cvt.s.dFG", false, false, false,
"cvt.w.dFG", "cvt.l.dFG",
}
local map_cop1w_r6 = {
shift = 0, mask = 63,
[0] = "cmp.af.sFGH", "cmp.un.sFGH", "cmp.eq.sFGH", "cmp.ueq.sFGH",
"cmp.lt.sFGH", "cmp.ult.sFGH", "cmp.le.sFGH", "cmp.ule.sFGH",
"cmp.saf.sFGH", "cmp.sun.sFGH", "cmp.seq.sFGH", "cmp.sueq.sFGH",
"cmp.slt.sFGH", "cmp.sult.sFGH", "cmp.sle.sFGH", "cmp.sule.sFGH",
false, "cmp.or.sFGH", "cmp.une.sFGH", "cmp.ne.sFGH",
false, false, false, false,
false, "cmp.sor.sFGH", "cmp.sune.sFGH", "cmp.sne.sFGH",
false, false, false, false,
"cvt.s.wFG", "cvt.d.wFG",
}
local map_cop1l_r6 = {
shift = 0, mask = 63,
[0] = "cmp.af.dFGH", "cmp.un.dFGH", "cmp.eq.dFGH", "cmp.ueq.dFGH",
"cmp.lt.dFGH", "cmp.ult.dFGH", "cmp.le.dFGH", "cmp.ule.dFGH",
"cmp.saf.dFGH", "cmp.sun.dFGH", "cmp.seq.dFGH", "cmp.sueq.dFGH",
"cmp.slt.dFGH", "cmp.sult.dFGH", "cmp.sle.dFGH", "cmp.sule.dFGH",
false, "cmp.or.dFGH", "cmp.une.dFGH", "cmp.ne.dFGH",
false, false, false, false,
false, "cmp.sor.dFGH", "cmp.sune.dFGH", "cmp.sne.dFGH",
false, false, false, false,
"cvt.s.lFG", "cvt.d.lFG",
}
local map_cop1_r6 = {
shift = 21, mask = 31,
[0] = "mfc1TG", "dmfc1TG", "cfc1TG", "mfhc1TG",
"mtc1TG", "dmtc1TG", "ctc1TG", "mthc1TG",
false, "bc1eqzHB", false, false,
false, "bc1nezHB", false, false,
map_cop1s_r6, map_cop1d_r6, false, false,
map_cop1w_r6, map_cop1l_r6,
}
local function maprs_popTS(rs, rt)
if rt == 0 then return 0 elseif rs == 0 then return 1
elseif rs == rt then return 2 else return 3 end
end
local map_pop06_r6 = {
maprs = maprs_popTS, [0] = "blezSB", "blezalcTB", "bgezalcTB", "bgeucSTB"
}
local map_pop07_r6 = {
maprs = maprs_popTS, [0] = "bgtzSB", "bgtzalcTB", "bltzalcTB", "bltucSTB"
}
local map_pop26_r6 = {
maprs = maprs_popTS, "blezcTB", "bgezcTB", "bgecSTB"
}
local map_pop27_r6 = {
maprs = maprs_popTS, "bgtzcTB", "bltzcTB", "bltcSTB"
}
local function maprs_popS(rs, rt)
if rs == 0 then return 0 else return 1 end
end
local map_pop66_r6 = {
maprs = maprs_popS, [0] = "jicTI", "beqzcSb"
}
local map_pop76_r6 = {
maprs = maprs_popS, [0] = "jialcTI", "bnezcSb"
}
local function maprs_popST(rs, rt)
if rs >= rt then return 0 elseif rs == 0 then return 1 else return 2 end
end
local map_pop10_r6 = {
maprs = maprs_popST, [0] = "bovcSTB", "beqzalcTB", "beqcSTB"
}
local map_pop30_r6 = {
maprs = maprs_popST, [0] = "bnvcSTB", "bnezalcTB", "bnecSTB"
}
local map_pri_r6 = {
[0] = map_special_r6, map_regimm_r6, "jJ", "jalJ",
"beq|beqz|bST00B", "bne|bnezST0B", map_pop06_r6, map_pop07_r6,
map_pop10_r6, "addiu|liTS0I", "sltiTSI", "sltiuTSI",
"andiTSU", "ori|liTS0U", "xoriTSU", "aui|luiTS0U",
map_cop0, map_cop1_r6, false, false,
false, false, map_pop26_r6, map_pop27_r6,
map_pop30_r6, "daddiuTSI", false, false,
false, "dauiTSI", false, map_special3_r6,
"lbTSO", "lhTSO", false, "lwTSO",
"lbuTSO", "lhuTSO", false, false,
"sbTSO", "shTSO", false, "swTSO",
false, false, false, false,
false, "lwc1HSO", "bc#", false,
false, "ldc1HSO", map_pop66_r6, "ldTSO",
false, "swc1HSO", "balc#", map_pcrel_r6,
false, "sdc1HSO", map_pop76_r6, "sdTSO",
}
------------------------------------------------------------------------------
local map_gpr = {
[0] = "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "sp", "r30", "ra",
}
------------------------------------------------------------------------------
-- 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 %-7s %s%s\n",
ctx.addr+pos, tohex(ctx.op), text, concat(operands, ", "), extra))
else
ctx.out(format("%08x %-7s %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 get_be(ctx)
local pos = ctx.pos
local b0, b1, b2, b3 = byte(ctx.code, pos+1, pos+4)
return bor(lshift(b0, 24), lshift(b1, 16), lshift(b2, 8), b3)
end
local function get_le(ctx)
local pos = ctx.pos
local b0, b1, b2, b3 = byte(ctx.code, pos+1, pos+4)
return bor(lshift(b3, 24), lshift(b2, 16), lshift(b1, 8), b0)
end
-- Disassemble a single instruction.
local function disass_ins(ctx)
local op = ctx:get()
local operands = {}
local last = nil
ctx.op = op
ctx.rel = nil
local opat = ctx.map_pri[rshift(op, 26)]
while type(opat) ~= "string" do
if not opat then return unknown(ctx) end
if opat.maprs then
opat = opat[opat.maprs(band(rshift(op,21),31), band(rshift(op,16),31))]
else
opat = opat[band(rshift(op, opat.shift), opat.mask)] or opat._
end
end
local name, pat = match(opat, "^([a-z0-9_.]*)(.*)")
local altname, pat2 = match(pat, "|([a-z0-9_.|]*)(.*)")
if altname then pat = pat2 end
for p in gmatch(pat, ".") do
local x = nil
if p == "S" then
x = map_gpr[band(rshift(op, 21), 31)]
elseif p == "T" then
x = map_gpr[band(rshift(op, 16), 31)]
elseif p == "D" then
x = map_gpr[band(rshift(op, 11), 31)]
elseif p == "F" then
x = "f"..band(rshift(op, 6), 31)
elseif p == "G" then
x = "f"..band(rshift(op, 11), 31)
elseif p == "H" then
x = "f"..band(rshift(op, 16), 31)
elseif p == "R" then
x = "f"..band(rshift(op, 21), 31)
elseif p == "A" then
x = band(rshift(op, 6), 31)
elseif p == "a" then
x = band(rshift(op, 6), 7)
elseif p == "E" then
x = band(rshift(op, 6), 31) + 32
elseif p == "M" then
x = band(rshift(op, 11), 31)
elseif p == "N" then
x = band(rshift(op, 16), 31)
elseif p == "C" then
x = band(rshift(op, 18), 7)
if x == 0 then x = nil end
elseif p == "K" then
x = band(rshift(op, 11), 31) + 1
elseif p == "P" then
x = band(rshift(op, 11), 31) + 33
elseif p == "L" then
x = band(rshift(op, 11), 31) - last + 1
elseif p == "Q" then
x = band(rshift(op, 11), 31) - last + 33
elseif p == "I" then
x = arshift(lshift(op, 16), 16)
elseif p == "2" then
x = arshift(lshift(op, 13), 11)
elseif p == "3" then
x = arshift(lshift(op, 14), 11)
elseif p == "U" then
x = band(op, 0xffff)
elseif p == "O" then
local disp = arshift(lshift(op, 16), 16)
operands[#operands] = format("%d(%s)", disp, last)
elseif p == "X" then
local index = map_gpr[band(rshift(op, 16), 31)]
operands[#operands] = format("%s(%s)", index, last)
elseif p == "B" then
x = ctx.addr + ctx.pos + arshift(lshift(op, 16), 14) + 4
ctx.rel = x
x = format("0x%08x", x)
elseif p == "b" then
x = ctx.addr + ctx.pos + arshift(lshift(op, 11), 9) + 4
ctx.rel = x
x = format("0x%08x", x)
elseif p == "#" then
x = ctx.addr + ctx.pos + arshift(lshift(op, 6), 4) + 4
ctx.rel = x
x = format("0x%08x", x)
elseif p == "J" then
local a = ctx.addr + ctx.pos
x = a - band(a, 0x0fffffff) + band(op, 0x03ffffff)*4
ctx.rel = x
x = format("0x%08x", x)
elseif p == "V" then
x = band(rshift(op, 8), 7)
if x == 0 then x = nil end
elseif p == "W" then
x = band(op, 7)
if x == 0 then x = nil end
elseif p == "Y" then
x = band(rshift(op, 6), 0x000fffff)
if x == 0 then x = nil end
elseif p == "Z" then
x = band(rshift(op, 6), 1023)
if x == 0 then x = nil end
elseif p == "0" then
if last == "r0" or last == 0 then
local n = #operands
operands[n] = nil
last = operands[n-1]
if altname then
local a1, a2 = match(altname, "([^|]*)|(.*)")
if a1 then name, altname = a1, a2
else name = altname end
end
end
elseif p == "1" then
if last == "ra" then
operands[#operands] = nil
end
else
assert(false)
end
if x then operands[#operands+1] = x; last = x end
end
return putop(ctx, name, 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
stop = stop - stop % 4
ctx.pos = ofs - ofs % 4
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
ctx.get = get_be
ctx.map_pri = map_pri
return ctx
end
local function create_el(code, addr, out)
local ctx = create(code, addr, out)
ctx.get = get_le
return ctx
end
local function create_r6(code, addr, out)
local ctx = create(code, addr, out)
ctx.map_pri = map_pri_r6
return ctx
end
local function create_r6_el(code, addr, out)
local ctx = create(code, addr, out)
ctx.get = get_le
ctx.map_pri = map_pri_r6
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 disass_el(code, addr, out)
create_el(code, addr, out):disass()
end
local function disass_r6(code, addr, out)
create_r6(code, addr, out):disass()
end
local function disass_r6_el(code, addr, out)
create_r6_el(code, addr, out):disass()
end
-- Return register name for RID.
local function regname(r)
if r < 32 then return map_gpr[r] end
return "f"..(r-32)
end
-- Public module functions.
return {
create = create,
create_el = create_el,
create_r6 = create_r6,
create_r6_el = create_r6_el,
disass = disass,
disass_el = disass_el,
disass_r6 = disass_r6,
disass_r6_el = disass_r6_el,
regname = regname
}
Zerion Mini Shell 1.0