dyncom: Implement SRS

src/core/arm/dyncom/arm_dyncom_interpreter.cpp

@@ -2585,7 +2585,23 @@ static ARM_INST_PTR INTERPRETER_TRANSLATE(smulw)(unsigned int inst, int index)
         inst_base->load_r15 = 1;
     return inst_base;
 }
-static ARM_INST_PTR INTERPRETER_TRANSLATE(srs)(unsigned int inst, int index)      { UNIMPLEMENTED_INSTRUCTION("SRS"); }
+
+static ARM_INST_PTR INTERPRETER_TRANSLATE(srs)(unsigned int inst, int index)
+{
+    arm_inst* const inst_base = (arm_inst*)AllocBuffer(sizeof(arm_inst) + sizeof(ldst_inst));
+    ldst_inst* const inst_cream = (ldst_inst*)inst_base->component;
+
+    inst_base->cond     = AL;
+    inst_base->idx      = index;
+    inst_base->br       = NON_BRANCH;
+    inst_base->load_r15 = 0;
+
+    inst_cream->inst     = inst;
+    inst_cream->get_addr = get_calc_addr_op(inst);
+
+    return inst_base;
+}
+
 static ARM_INST_PTR INTERPRETER_TRANSLATE(ssat)(unsigned int inst, int index)
 {
     arm_inst* const inst_base = (arm_inst*)AllocBuffer(sizeof(arm_inst) + sizeof(ssat_inst));
@@ -5963,6 +5979,21 @@ unsigned InterpreterMainLoop(ARMul_State* state) {
     }
 
     SRS_INST:
+    {
+        // SRS is unconditional
+        ldst_inst* const inst_cream = (ldst_inst*)inst_base->component;
+
+        u32 address = 0;
+        inst_cream->get_addr(cpu, inst_cream->inst, address, 1);
+
+        WriteMemory32(cpu, address + 0, cpu->Reg[14]);
+        WriteMemory32(cpu, address + 4, cpu->Spsr_copy);
+
+        cpu->Reg[15] += GET_INST_SIZE(cpu);
+        INC_PC(sizeof(ldst_inst));
+        FETCH_INST;
+        GOTO_NEXT_INST;
+    }
 
     SSAT_INST:
     {