arm_dyncom_interpreter: Add specialized GetAddressingOpLoadStoreT func

This allows us to get the addressing operation for STRT, LDRT, STRBT,
and LDRBT. We do this so that translation functions don't need to
see the addressing ops directly.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/core/arm/dyncom/arm_dyncom_interpreter.cpp b/src/core/arm/dyncom/arm_dyncom_interpreter.cpp
index acf66b350a..7f6cf6e29d 100644
--- a/src/core/arm/dyncom/arm_dyncom_interpreter.cpp
+++ b/src/core/arm/dyncom/arm_dyncom_interpreter.cpp
@@ -753,6 +753,21 @@ static get_addr_fp_t GetAddressingOp(unsigned int inst) {
     return nullptr;
 }
 
+// Specialized for LDRT, LDRBT, STRT, and STRBT, which have specific addressing mode requirements
+get_addr_fp_t GetAddressingOpLoadStoreT(unsigned int inst) {
+    if (BITS(inst, 25, 27) == 2) {
+        return LnSWoUB(ImmediatePostIndexed);
+    } else if (BITS(inst, 25, 27) == 3) {
+        return LnSWoUB(ScaledRegisterPostIndexed);
+    }
+    // Reaching this would indicate the thumb version
+    // of this instruction, however the 3DS CPU doesn't
+    // support this variant (the 3DS CPU is only ARMv6K,
+    // while this variant is added in ARMv6T2).
+    // So it's sufficient for citra to not implement this.
+    return nullptr;
+}
+
 typedef ARM_INST_PTR (*transop_fp_t)(unsigned int, int);
 
 #include "arm_dyncom_trans.inc"