thumb32: Implement STMIA/STMEA

src/CMakeLists.txt

@@ -163,6 +163,7 @@ if ("A32" IN_LIST DYNARMIC_FRONTENDS)
         frontend/A32/translate/impl/thumb32_data_processing_shifted_register.cpp
         frontend/A32/translate/impl/thumb32_load_byte.cpp
         frontend/A32/translate/impl/thumb32_load_halfword.cpp
+        frontend/A32/translate/impl/thumb32_load_store_multiple.cpp
         frontend/A32/translate/impl/thumb32_load_word.cpp
         frontend/A32/translate/impl/thumb32_long_multiply.cpp
         frontend/A32/translate/impl/thumb32_misc.cpp

src/frontend/A32/decoder/thumb32.inc

@@ -1,7 +1,7 @@
 // Load/Store Multiple
 //INST(thumb32_SRS_1,          "SRS",                      "1110100000-0--------------------")
 //INST(thumb32_RFE_2,          "RFE",                      "1110100000-1--------------------")
-//INST(thumb32_STMIA,          "STMIA/STMEA",              "1110100010-0--------------------")
+INST(thumb32_STMIA,          "STMIA/STMEA",              "1110100010W0nnnn0iiiiiiiiiiiiiii")
 //INST(thumb32_POP,            "POP",                      "1110100010111101----------------")
 //INST(thumb32_LDMIA,          "LDMIA/LDMFD",              "1110100010-1--------------------")
 //INST(thumb32_PUSH,           "PUSH",                     "1110100100101101----------------")

src/frontend/A32/translate/impl/thumb32_load_store_multiple.cpp

@@ -0,0 +1,40 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2021 MerryMage
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#include "common/bit_util.h"
+#include "frontend/A32/translate/impl/translate_thumb.h"
+
+namespace Dynarmic::A32 {
+
+bool ThumbTranslatorVisitor::thumb32_STMIA(bool W, Reg n, Imm<15> reg_list) {
+    const auto regs_imm = reg_list.ZeroExtend();
+    const auto num_regs = static_cast<u32>(Common::BitCount(regs_imm));
+
+    if (n == Reg::PC || num_regs < 2) {
+        return UnpredictableInstruction();
+    }
+    if (W && Common::Bit(static_cast<size_t>(n), regs_imm)) {
+        return UnpredictableInstruction();
+    }
+    if (reg_list.Bit<13>()) {
+        return UnpredictableInstruction();
+    }
+
+    IR::U32 address = ir.GetRegister(n);
+    for (size_t i = 0; i < 15; i++) {
+        if (Common::Bit(i, regs_imm)) {
+            ir.WriteMemory32(address, ir.GetRegister(static_cast<Reg>(i)));
+        }
+
+        address = ir.Add(address, ir.Imm32(4));
+    }
+
+    if (W) {
+        ir.SetRegister(n, address);
+    }
+    return true;
+}
+
+} // namespace Dynarmic::A32

src/frontend/A32/translate/impl/translate_thumb.h

@@ -171,6 +171,9 @@ struct ThumbTranslatorVisitor final {
     bool thumb16_B_t1(Cond cond, Imm<8> imm8);
     bool thumb16_B_t2(Imm<11> imm11);
 
+    // thumb32 load/store multiple instructions
+    bool thumb32_STMIA(bool W, Reg n, Imm<15> reg_list);
+
     // thumb32 data processing (shifted register) instructions
     bool thumb32_TST_reg(Reg n, Imm<3> imm3, Imm<2> imm2, ShiftType type, Reg m);
     bool thumb32_AND_reg(bool S, Reg n, Imm<3> imm3, Reg d, Imm<2> imm2, ShiftType type, Reg m);