summaryrefslogtreecommitdiffstatshomepage
path: root/trunk/src/emu/cpu/dsp56k/opcode.c
diff options
context:
space:
mode:
Diffstat (limited to 'trunk/src/emu/cpu/dsp56k/opcode.c')
-rw-r--r--trunk/src/emu/cpu/dsp56k/opcode.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/trunk/src/emu/cpu/dsp56k/opcode.c b/trunk/src/emu/cpu/dsp56k/opcode.c
new file mode 100644
index 00000000000..0e9ad3706dc
--- /dev/null
+++ b/trunk/src/emu/cpu/dsp56k/opcode.c
@@ -0,0 +1,81 @@
+#include <stdio.h>
+
+#include "opcode.h"
+
+namespace DSP56K
+{
+
+Opcode::Opcode(UINT16 w0, UINT16 w1) : m_word0(w0), m_word1(w1)
+{
+ m_instruction = Instruction::decodeInstruction(this, w0, w1);
+ m_parallelMove = ParallelMove::decodeParallelMove(this, w0, w1);
+}
+
+
+Opcode::~Opcode()
+{
+ global_free(m_instruction);
+ global_free(m_parallelMove);
+}
+
+
+astring Opcode::disassemble() const
+{
+ // Duck out early if there isn't a valid op
+ if (!m_instruction)
+ return dcString();
+
+ // Duck out if either has had an explicit error.
+ if (m_instruction && !m_instruction->valid())
+ return dcString();
+ if (m_parallelMove && !m_parallelMove->valid())
+ return dcString();
+
+ // Disassemble what you can.
+ astring opString = "";
+ astring pmString = "";
+ if (m_instruction) m_instruction->disassemble(opString);
+ if (m_parallelMove) m_parallelMove->disassemble(pmString);
+
+ return opString + " " + pmString;
+}
+
+
+void Opcode::evaluate(dsp56k_core* cpustate) const
+{
+ if (m_instruction) m_instruction->evaluate(cpustate);
+ if (m_parallelMove) m_parallelMove->evaluate();
+}
+
+
+size_t Opcode::size() const
+{
+ if (m_instruction && m_instruction->valid())
+ return m_instruction->size() + m_instruction->sizeIncrement();
+
+ // Opcode failed to decode, so push it past dc
+ return 1;
+}
+
+size_t Opcode::evalSize() const
+{
+ if (m_instruction && m_instruction->valid())
+ return m_instruction->evalSize(); // Probably doesn't matter : + m_instruction->sizeIncrement();
+
+ // Opcode failed to decode, so push it past dc
+ return 1;
+}
+
+
+const reg_id& Opcode::instSource() const { return m_instruction->source(); }
+const reg_id& Opcode::instDestination() const { return m_instruction->destination(); }
+const size_t Opcode::instAccumulatorBitsModified() const { return m_instruction->accumulatorBitsModified(); }
+
+astring Opcode::dcString() const
+{
+ char tempStr[1024];
+ sprintf(tempStr, "dc $%x", m_word0);
+ return astring(tempStr);
+}
+
+}