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arm_disasm: ARMv6 reversal media instructions

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REV, REV16, REVSH
Only their ARM encoding, Thumb encoding is still missing.
This commit is contained in:
aroulin 2015-08-09 13:52:51 +02:00
parent e4ff244288
commit 0be8e1bfb6
2 changed files with 26 additions and 0 deletions
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22
src/core/arm/disassembler/arm_disasm.cpp
View file

@ -69,6 +69,9 @@ static const char *opcode_names[] = {
"orr", "orr",
"pkh", "pkh",
"pld", "pld",
"rev",
"rev16",
"revsh",
"rsb", "rsb",
"rsc", "rsc",
"sbc", "sbc",
@ -259,6 +262,10 @@ std::string ARM_Disasm::Disassemble(uint32_t addr, uint32_t insn)
return DisassemblePKH(insn); return DisassemblePKH(insn);
case OP_PLD: case OP_PLD:
return DisassemblePLD(insn); return DisassemblePLD(insn);
case OP_REV:
case OP_REV16:
case OP_REVSH:
return DisassembleREV(opcode, insn);
case OP_SEL: case OP_SEL:
return DisassembleSEL(insn); return DisassembleSEL(insn);
case OP_SSAT: case OP_SSAT:
@ -772,6 +779,15 @@ std::string ARM_Disasm::DisassemblePLD(uint32_t insn)
} }
} }
std::string ARM_Disasm::DisassembleREV(Opcode opcode, uint32_t insn) {
uint32_t cond = BITS(insn, 28, 31);
uint32_t rd = BITS(insn, 12, 15);
uint32_t rm = BITS(insn, 0, 3);
return Common::StringFromFormat("%s%s\tr%u, r%u", opcode_names[opcode], cond_to_str(cond),
rd, rm);
}
std::string ARM_Disasm::DisassembleREX(Opcode opcode, uint32_t insn) { std::string ARM_Disasm::DisassembleREX(Opcode opcode, uint32_t insn) {
uint32_t rn = BITS(insn, 16, 19); uint32_t rn = BITS(insn, 16, 19);
uint32_t rd = BITS(insn, 12, 15); uint32_t rd = BITS(insn, 12, 15);
@ -1094,12 +1110,16 @@ Opcode ARM_Disasm::DecodePackingSaturationReversal(uint32_t insn) {
return OP_SXTB; return OP_SXTB;
break; break;
case 0x3: case 0x3:
if (op2 == 0x1)
return OP_REV;
if (BIT(op2, 0) == 0) if (BIT(op2, 0) == 0)
return OP_SSAT; return OP_SSAT;
if (op2 == 0x3 && a != 0xf) if (op2 == 0x3 && a != 0xf)
return OP_SXTAH; return OP_SXTAH;
if (op2 == 0x3 && a == 0xf) if (op2 == 0x3 && a == 0xf)
return OP_SXTH; return OP_SXTH;
if (op2 == 0x5)
return OP_REV16;
break; break;
case 0x4: case 0x4:
if (op2 == 0x3 && a != 0xf) if (op2 == 0x3 && a != 0xf)
@ -1124,6 +1144,8 @@ Opcode ARM_Disasm::DecodePackingSaturationReversal(uint32_t insn) {
return OP_UXTAH; return OP_UXTAH;
if (op2 == 0x3 && a == 0xf) if (op2 == 0x3 && a == 0xf)
return OP_UXTH; return OP_UXTH;
if (op2 == 0x5)
return OP_REVSH;
break; break;
default: default:
break; break;

4
src/core/arm/disassembler/arm_disasm.h
View file

@ -50,6 +50,9 @@ enum Opcode {
OP_ORR, OP_ORR,
OP_PKH, OP_PKH,
OP_PLD, OP_PLD,
OP_REV,
OP_REV16,
OP_REVSH,
OP_RSB, OP_RSB,
OP_RSC, OP_RSC,
OP_SBC, OP_SBC,
@ -174,6 +177,7 @@ class ARM_Disasm {
static std::string DisassembleNoOperands(Opcode opcode, uint32_t insn); static std::string DisassembleNoOperands(Opcode opcode, uint32_t insn);
static std::string DisassemblePKH(uint32_t insn); static std::string DisassemblePKH(uint32_t insn);
static std::string DisassemblePLD(uint32_t insn); static std::string DisassemblePLD(uint32_t insn);
static std::string DisassembleREV(Opcode opcode, uint32_t insn);
static std::string DisassembleREX(Opcode opcode, uint32_t insn); static std::string DisassembleREX(Opcode opcode, uint32_t insn);
static std::string DisassembleSAT(Opcode opcode, uint32_t insn); static std::string DisassembleSAT(Opcode opcode, uint32_t insn);
static std::string DisassembleSEL(uint32_t insn); static std::string DisassembleSEL(uint32_t insn);