Arm: BLX is UNPREDICTABLE when Rm is PC

2026-02-18 22:42:58 +00:00 · 2016-08-07 20:50:33 +01:00
parent 1af5bef32c
commit 4dcd1d1859
2 changed files with 4 additions and 1 deletions
--- a/src/frontend/translate/translate_arm/branch.cpp
+++ b/src/frontend/translate/translate_arm/branch.cpp
@@ -44,6 +44,8 @@ bool ArmTranslatorVisitor::arm_BLX_imm(bool H, Imm24 imm24) {
 }

 bool ArmTranslatorVisitor::arm_BLX_reg(Cond cond, Reg m) {
+    if (m == Reg::PC)
+        return UnpredictableInstruction();
    // BLX <Rm>
    if (ConditionPassed(cond)) {
        ir.SetRegister(Reg::LR, ir.Imm32(ir.current_location.PC() + 4));