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arm: Implement LDRH reg/imm instructions.

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This commit is contained in:
bunnei 2016-08-04 23:12:45 -04:00
parent 192a0fba7a
commit ec3a98cf95
2 changed files with 28 additions and 4 deletions
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4
src/frontend/decoder/arm.h
View file

@ -185,8 +185,8 @@ boost::optional<const ArmMatcher<V>&> DecodeArm(u32 instruction) {
//INST(&V::arm_LDRBT, "LDRBT (A2)", "cccc0110u111nnnnttttvvvvvrr0mmmm"),
//INST(&V::arm_LDRD_imm, "LDRD (imm)", "cccc000pu1w0nnnnddddvvvv1101vvvv"), // v5E
//INST(&V::arm_LDRD_reg, "LDRD (reg)", "cccc000pu0w0nnnndddd00001101mmmm"), // v5E
//INST(&V::arm_LDRH_imm, "LDRH (imm)", "cccc000pu1w1nnnnddddvvvv1011vvvv"),
//INST(&V::arm_LDRH_reg, "LDRH (reg)", "cccc000pu0w1nnnndddd00001011mmmm"),
INST(&V::arm_LDRH_imm, "LDRH (imm)", "cccc000pu1w1nnnnddddvvvv1011vvvv"),
INST(&V::arm_LDRH_reg, "LDRH (reg)", "cccc000pu0w1nnnndddd00001011mmmm"),
//INST(&V::arm_LDRHT, "LDRHT (A1)", "----0000-111------------1011----"),
//INST(&V::arm_LDRHT, "LDRHT (A2)", "----0000-011--------00001011----"),
//INST(&V::arm_LDRSB_imm, "LDRSB (imm)", "cccc000pu1w1nnnnddddvvvv1101vvvv"),

28
src/frontend/translate/translate_arm/load_store.cpp
View file

@ -117,11 +117,35 @@ bool ArmTranslatorVisitor::arm_LDRD_reg(Cond cond, bool P, bool U, bool W, Reg n
}
bool ArmTranslatorVisitor::arm_LDRH_imm(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Imm4 imm8a, Imm4 imm8b) {
return InterpretThisInstruction();
if (ConditionPassed(cond)) {
const auto data = ir.ReadMemory16(GetAddressingMode(ir, P, U, W, n, ir.Imm32(imm8a << 4 | imm8b)));
if (d == Reg::PC) {
ir.ALUWritePC(ir.Add(data, ir.Imm32(4)));
ir.SetTerm(IR::Term::ReturnToDispatch{});
return false;
}
ir.SetRegister(d, data);
}
return true;
}
bool ArmTranslatorVisitor::arm_LDRH_reg(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Reg m) {
return InterpretThisInstruction();
if (ConditionPassed(cond)) {
const auto data = ir.ReadMemory16(GetAddressingMode(ir, P, U, W, n, ir.GetRegister(m)));
if (d == Reg::PC) {
ir.ALUWritePC(ir.Add(data, ir.Imm32(4)));
ir.SetTerm(IR::Term::ReturnToDispatch{});
return false;
}
ir.SetRegister(d, data);
}
return true;
}
bool ArmTranslatorVisitor::arm_LDRHT() {