mirror of
https://github.com/citra-emu/citra.git
synced 2024-12-18 12:10:04 +00:00
arm_disasm: ARMv6 packing and sign-extend media instructions
PKH, SEL SXTAB, SXTAB16, SXTB, SXTB16, SXTH, SXTAH UXTAB, UXTAB16, UXTB, UXTB16, UXTH, UXTAH
This commit is contained in:
aroulin
parent
f48a89af8b
commit
47657a1817
@ -1,6 +1,7 @@
|
||||
// Copyright 2006 The Android Open Source Project
|
||||
|
||||
#include <string>
|
||||
#include <unordered_set>
|
||||
|
||||
#include "common/string_util.h"
|
||||
#include "core/arm/disassembler/arm_disasm.h"
|
||||
@ -66,10 +67,12 @@ static const char *opcode_names[] = {
|
||||
"mvn",
|
||||
"nop",
|
||||
"orr",
|
||||
"pkh",
|
||||
"pld",
|
||||
"rsb",
|
||||
"rsc",
|
||||
"sbc",
|
||||
"sel",
|
||||
"sev",
|
||||
"smlal",
|
||||
"smull",
|
||||
@ -88,10 +91,22 @@ static const char *opcode_names[] = {
|
||||
"swi",
|
||||
"swp",
|
||||
"swpb",
|
||||
"sxtab",
|
||||
"sxtab16",
|
||||
"sxtah",
|
||||
"sxtb",
|
||||
"sxtb16",
|
||||
"sxth",
|
||||
"teq",
|
||||
"tst",
|
||||
"umlal",
|
||||
"umull",
|
||||
"uxtab",
|
||||
"uxtab16",
|
||||
"uxtah",
|
||||
"uxtb",
|
||||
"uxtb16",
|
||||
"uxth",
|
||||
"wfe",
|
||||
"wfi",
|
||||
"yield",
|
||||
@ -236,8 +251,12 @@ std::string ARM_Disasm::Disassemble(uint32_t addr, uint32_t insn)
|
||||
case OP_WFI:
|
||||
case OP_YIELD:
|
||||
return DisassembleNoOperands(opcode, insn);
|
||||
case OP_PKH:
|
||||
return DisassemblePKH(insn);
|
||||
case OP_PLD:
|
||||
return DisassemblePLD(insn);
|
||||
case OP_SEL:
|
||||
return DisassembleSEL(insn);
|
||||
case OP_STC:
|
||||
return "stc";
|
||||
case OP_SWI:
|
||||
@ -245,6 +264,19 @@ std::string ARM_Disasm::Disassemble(uint32_t addr, uint32_t insn)
|
||||
case OP_SWP:
|
||||
case OP_SWPB:
|
||||
return DisassembleSWP(opcode, insn);
|
||||
case OP_SXTAB:
|
||||
case OP_SXTAB16:
|
||||
case OP_SXTAH:
|
||||
case OP_SXTB:
|
||||
case OP_SXTB16:
|
||||
case OP_SXTH:
|
||||
case OP_UXTAB:
|
||||
case OP_UXTAB16:
|
||||
case OP_UXTAH:
|
||||
case OP_UXTB:
|
||||
case OP_UXTB16:
|
||||
case OP_UXTH:
|
||||
return DisassembleXT(opcode, insn);
|
||||
case OP_UMLAL:
|
||||
case OP_UMULL:
|
||||
case OP_SMLAL:
|
||||
@ -684,6 +716,30 @@ std::string ARM_Disasm::DisassembleNoOperands(Opcode opcode, uint32_t insn)
|
||||
return Common::StringFromFormat("%s%s", opcode_names[opcode], cond_to_str(cond));
|
||||
}
|
||||
|
||||
std::string ARM_Disasm::DisassemblePKH(uint32_t insn)
|
||||
{
|
||||
uint32_t cond = BITS(insn, 28, 31);
|
||||
uint32_t rn = BITS(insn, 16, 19);
|
||||
uint32_t rd = BITS(insn, 12, 15);
|
||||
uint32_t imm5 = BITS(insn, 7, 11);
|
||||
uint32_t tb = BIT(insn, 6);
|
||||
uint32_t rm = BITS(insn, 0, 3);
|
||||
|
||||
std::string suffix = tb ? "tb" : "bt";
|
||||
std::string shift = "";
|
||||
|
||||
if (tb && imm5 == 0)
|
||||
imm5 = 32;
|
||||
|
||||
if (imm5 > 0) {
|
||||
shift = tb ? ", ASR" : ", LSL";
|
||||
shift += " #" + std::to_string(imm5);
|
||||
}
|
||||
|
||||
return Common::StringFromFormat("pkh%s%s\tr%u, r%u, r%u%s", suffix.c_str(), cond_to_str(cond),
|
||||
rd, rn, rm, shift.c_str());
|
||||
}
|
||||
|
||||
std::string ARM_Disasm::DisassemblePLD(uint32_t insn)
|
||||
{
|
||||
uint8_t is_reg = (insn >> 25) & 0x1;
|
||||
@ -737,6 +793,17 @@ std::string ARM_Disasm::DisassembleREX(Opcode opcode, uint32_t insn) {
|
||||
}
|
||||
}
|
||||
|
||||
std::string ARM_Disasm::DisassembleSEL(uint32_t insn)
|
||||
{
|
||||
uint32_t cond = BITS(insn, 28, 31);
|
||||
uint32_t rn = BITS(insn, 16, 19);
|
||||
uint32_t rd = BITS(insn, 12, 15);
|
||||
uint32_t rm = BITS(insn, 0, 3);
|
||||
|
||||
return Common::StringFromFormat("%s%s\tr%u, r%u, r%u", opcode_names[OP_SEL], cond_to_str(cond),
|
||||
rd, rn, rm);
|
||||
}
|
||||
|
||||
std::string ARM_Disasm::DisassembleSWI(uint32_t insn)
|
||||
{
|
||||
uint8_t cond = (insn >> 28) & 0xf;
|
||||
@ -756,6 +823,30 @@ std::string ARM_Disasm::DisassembleSWP(Opcode opcode, uint32_t insn)
|
||||
return Common::StringFromFormat("%s%s\tr%d, r%d, [r%d]", opname, cond_to_str(cond), rd, rm, rn);
|
||||
}
|
||||
|
||||
std::string ARM_Disasm::DisassembleXT(Opcode opcode, uint32_t insn)
|
||||
{
|
||||
uint32_t cond = BITS(insn, 28, 31);
|
||||
uint32_t rn = BITS(insn, 16, 19);
|
||||
uint32_t rd = BITS(insn, 12, 15);
|
||||
uint32_t rotate = BITS(insn, 10, 11);
|
||||
uint32_t rm = BITS(insn, 0, 3);
|
||||
|
||||
std::string rn_part = "";
|
||||
static std::unordered_set<Opcode, std::hash<int>> extend_with_add = {
|
||||
OP_SXTAB, OP_SXTAB16, OP_SXTAH,
|
||||
OP_UXTAB, OP_UXTAB16, OP_UXTAH
|
||||
};
|
||||
if (extend_with_add.find(opcode) != extend_with_add.end())
|
||||
rn_part = ", r" + std::to_string(rn);
|
||||
|
||||
std::string rotate_part = "";
|
||||
if (rotate != 0)
|
||||
rotate_part = ", ROR #" + std::to_string(rotate << 3);
|
||||
|
||||
return Common::StringFromFormat("%s%s\tr%u%s, r%u%s", opcode_names[opcode], cond_to_str(cond),
|
||||
rd, rn_part.c_str(), rm, rotate_part.c_str());
|
||||
}
|
||||
|
||||
Opcode ARM_Disasm::Decode(uint32_t insn) {
|
||||
uint32_t bits27_26 = (insn >> 26) & 0x3;
|
||||
switch (bits27_26) {
|
||||
@ -818,7 +909,7 @@ Opcode ARM_Disasm::Decode01(uint32_t insn) {
|
||||
uint8_t is_reg = (insn >> 25) & 0x1;
|
||||
uint8_t bit4 = (insn >> 4) & 0x1;
|
||||
if (is_reg == 1 && bit4 == 1)
|
||||
return OP_UNDEFINED;
|
||||
return DecodeMedia(insn);
|
||||
uint8_t is_load = (insn >> 20) & 0x1;
|
||||
uint8_t is_byte = (insn >> 22) & 0x1;
|
||||
if ((insn & 0xfd70f000) == 0xf550f000) {
|
||||
@ -940,6 +1031,59 @@ Opcode ARM_Disasm::DecodeSyncPrimitive(uint32_t insn) {
|
||||
}
|
||||
}
|
||||
|
||||
Opcode ARM_Disasm::DecodePackingSaturationReversal(uint32_t insn) {
|
||||
uint32_t op1 = BITS(insn, 20, 22);
|
||||
uint32_t a = BITS(insn, 16, 19);
|
||||
uint32_t op2 = BITS(insn, 5, 7);
|
||||
|
||||
switch (op1) {
|
||||
case 0x0:
|
||||
if (BIT(op2, 0) == 0)
|
||||
return OP_PKH;
|
||||
if (op2 == 0x3 && a != 0xf)
|
||||
return OP_SXTAB16;
|
||||
if (op2 == 0x3 && a == 0xf)
|
||||
return OP_SXTB16;
|
||||
if (op2 == 0x5)
|
||||
return OP_SEL;
|
||||
break;
|
||||
case 0x2:
|
||||
if (op2 == 0x3 && a != 0xf)
|
||||
return OP_SXTAB;
|
||||
if (op2 == 0x3 && a == 0xf)
|
||||
return OP_SXTB;
|
||||
break;
|
||||
case 0x3:
|
||||
if (op2 == 0x3 && a != 0xf)
|
||||
return OP_SXTAH;
|
||||
if (op2 == 0x3 && a == 0xf)
|
||||
return OP_SXTH;
|
||||
break;
|
||||
case 0x4:
|
||||
if (op2 == 0x3 && a != 0xf)
|
||||
return OP_UXTAB16;
|
||||
if (op2 == 0x3 && a == 0xf)
|
||||
return OP_UXTB16;
|
||||
break;
|
||||
case 0x6:
|
||||
if (op2 == 0x3 && a != 0xf)
|
||||
return OP_UXTAB;
|
||||
if (op2 == 0x3 && a == 0xf)
|
||||
return OP_UXTB;
|
||||
break;
|
||||
case 0x7:
|
||||
if (op2 == 0x3 && a != 0xf)
|
||||
return OP_UXTAH;
|
||||
if (op2 == 0x3 && a == 0xf)
|
||||
return OP_UXTH;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return OP_UNDEFINED;
|
||||
}
|
||||
|
||||
Opcode ARM_Disasm::DecodeMUL(uint32_t insn) {
|
||||
uint8_t bit24 = (insn >> 24) & 0x1;
|
||||
if (bit24 != 0) {
|
||||
@ -999,6 +1143,23 @@ Opcode ARM_Disasm::DecodeMSRImmAndHints(uint32_t insn) {
|
||||
return OP_MSR;
|
||||
}
|
||||
|
||||
Opcode ARM_Disasm::DecodeMedia(uint32_t insn) {
|
||||
uint32_t op1 = BITS(insn, 20, 24);
|
||||
uint32_t rd = BITS(insn, 12, 15);
|
||||
uint32_t op2 = BITS(insn, 5, 7);
|
||||
uint32_t rn = BITS(insn, 0, 3);
|
||||
|
||||
switch (BITS(op1, 3, 4)) {
|
||||
case 0x1:
|
||||
// Packing, unpacking, saturation, and reversal
|
||||
return DecodePackingSaturationReversal(insn);
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return OP_UNDEFINED;
|
||||
}
|
||||
|
||||
Opcode ARM_Disasm::DecodeLDRH(uint32_t insn) {
|
||||
uint8_t is_load = (insn >> 20) & 0x1;
|
||||
uint8_t bits_65 = (insn >> 5) & 0x3;
|
||||
|
||||
@ -48,10 +48,12 @@ enum Opcode {
|
||||
OP_MVN,
|
||||
OP_NOP,
|
||||
OP_ORR,
|
||||
OP_PKH,
|
||||
OP_PLD,
|
||||
OP_RSB,
|
||||
OP_RSC,
|
||||
OP_SBC,
|
||||
OP_SEL,
|
||||
OP_SEV,
|
||||
OP_SMLAL,
|
||||
OP_SMULL,
|
||||
@ -70,10 +72,22 @@ enum Opcode {
|
||||
OP_SWI,
|
||||
OP_SWP,
|
||||
OP_SWPB,
|
||||
OP_SXTAB,
|
||||
OP_SXTAB16,
|
||||
OP_SXTAH,
|
||||
OP_SXTB,
|
||||
OP_SXTB16,
|
||||
OP_SXTH,
|
||||
OP_TEQ,
|
||||
OP_TST,
|
||||
OP_UMLAL,
|
||||
OP_UMULL,
|
||||
OP_UXTAB,
|
||||
OP_UXTAB16,
|
||||
OP_UXTAH,
|
||||
OP_UXTB,
|
||||
OP_UXTB16,
|
||||
OP_UXTH,
|
||||
OP_WFE,
|
||||
OP_WFI,
|
||||
OP_YIELD,
|
||||
@ -132,8 +146,10 @@ class ARM_Disasm {
|
||||
static Opcode Decode10(uint32_t insn);
|
||||
static Opcode Decode11(uint32_t insn);
|
||||
static Opcode DecodeSyncPrimitive(uint32_t insn);
|
||||
static Opcode DecodePackingSaturationReversal(uint32_t insn);
|
||||
static Opcode DecodeMUL(uint32_t insn);
|
||||
static Opcode DecodeMSRImmAndHints(uint32_t insn);
|
||||
static Opcode DecodeMedia(uint32_t insn);
|
||||
static Opcode DecodeLDRH(uint32_t insn);
|
||||
static Opcode DecodeALU(uint32_t insn);
|
||||
|
||||
@ -152,8 +168,11 @@ class ARM_Disasm {
|
||||
static std::string DisassembleMRS(uint32_t insn);
|
||||
static std::string DisassembleMSR(uint32_t insn);
|
||||
static std::string DisassembleNoOperands(Opcode opcode, uint32_t insn);
|
||||
static std::string DisassemblePKH(uint32_t insn);
|
||||
static std::string DisassemblePLD(uint32_t insn);
|
||||
static std::string DisassembleREX(Opcode opcode, uint32_t insn);
|
||||
static std::string DisassembleSEL(uint32_t insn);
|
||||
static std::string DisassembleSWI(uint32_t insn);
|
||||
static std::string DisassembleSWP(Opcode opcode, uint32_t insn);
|
||||
static std::string DisassembleXT(Opcode opcode, uint32_t insn);
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user