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load_store: Add correctness checks for STRD variants (#7)

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STRD doesn't allow the use of the PC in either Rt or Rt2
This commit is contained in:
Mat M 2016-09-02 12:32:02 -04:00 committed by Merry
parent d16badbc04
commit 00d0f4d5ff
2 changed files with 36 additions and 10 deletions
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42
src/frontend/translate/translate_arm/load_store.cpp
View file

@ -589,13 +589,26 @@ bool ArmTranslatorVisitor::arm_STRB_reg(Cond cond, bool P, bool U, bool W, Reg n
return true;
}
bool ArmTranslatorVisitor::arm_STRD_imm(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Imm4 imm8a, Imm4 imm8b) {
bool ArmTranslatorVisitor::arm_STRD_imm(Cond cond, bool P, bool U, bool W, Reg n, Reg t, Imm4 imm8a, Imm4 imm8b) {
if (size_t(t) % 2 != 0)
return UnpredictableInstruction();
if (!P && W)
return UnpredictableInstruction();
const Reg t2 = t + 1;
if (W && (n == Reg::PC || n == t || n == t2))
return UnpredictableInstruction();
if (t2 == Reg::PC)
return UnpredictableInstruction();
if (ConditionPassed(cond)) {
const auto address_a = GetAddressingMode(ir, P, U, W, n, ir.Imm32(imm8a << 4 | imm8b));
const auto address_b = ir.Add(address_a, ir.Imm32(4));
const auto value_a = (d == Reg::PC) ? ir.Imm32(ir.PC() - 8) : ir.GetRegister(d);
const Reg reg_b = static_cast<Reg>(std::min(d + 1, Reg::R15));
const auto value_b = (reg_b == Reg::PC) ? ir.Imm32(ir.PC() - 8) : ir.GetRegister(reg_b);
const auto value_a = ir.GetRegister(t);
const auto value_b = ir.GetRegister(t2);
ir.WriteMemory32(address_a, value_a);
ir.WriteMemory32(address_b, value_b);
}
@ -603,13 +616,26 @@ bool ArmTranslatorVisitor::arm_STRD_imm(Cond cond, bool P, bool U, bool W, Reg n
return true;
}
bool ArmTranslatorVisitor::arm_STRD_reg(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Reg m) {
bool ArmTranslatorVisitor::arm_STRD_reg(Cond cond, bool P, bool U, bool W, Reg n, Reg t, Reg m) {
if (size_t(t) % 2 != 0)
return UnpredictableInstruction();
if (!P && W)
return UnpredictableInstruction();
const Reg t2 = t + 1;
if (t2 == Reg::PC || m == Reg::PC)
return UnpredictableInstruction();
if (W && (n == Reg::PC || n == t || n == t2))
return UnpredictableInstruction();
if (ConditionPassed(cond)) {
const auto address_a = GetAddressingMode(ir, P, U, W, n, ir.GetRegister(m));
const auto address_b = ir.Add(address_a, ir.Imm32(4));
const auto value_a = (d == Reg::PC) ? ir.Imm32(ir.PC() - 8) : ir.GetRegister(d);
const Reg reg_b = static_cast<Reg>(std::min(d + 1, Reg::R15));
const auto value_b = (reg_b == Reg::PC) ? ir.Imm32(ir.PC() - 8) : ir.GetRegister(reg_b);
const auto value_a = ir.GetRegister(t);
const auto value_b = ir.GetRegister(t2);
ir.WriteMemory32(address_a, value_a);
ir.WriteMemory32(address_b, value_b);
}

4
src/frontend/translate/translate_arm/translate_arm.h
View file

@ -188,8 +188,8 @@ struct ArmTranslatorVisitor final {
bool arm_STR_reg(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Imm5 imm5, ShiftType shift, Reg m);
bool arm_STRB_imm(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Imm12 imm12);
bool arm_STRB_reg(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Imm5 imm5, ShiftType shift, Reg m);
bool arm_STRD_imm(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Imm4 imm8a, Imm4 imm8b);
bool arm_STRD_reg(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Reg m);
bool arm_STRD_imm(Cond cond, bool P, bool U, bool W, Reg n, Reg t, Imm4 imm8a, Imm4 imm8b);
bool arm_STRD_reg(Cond cond, bool P, bool U, bool W, Reg n, Reg t, Reg m);
bool arm_STRH_imm(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Imm4 imm8a, Imm4 imm8b);
bool arm_STRH_reg(Cond cond, bool P, bool U, bool W, Reg n, Reg d, Reg m);