From: Martin Perner <martin@perner.cc>
Date: Wed, 3 Nov 2010 13:58:20 +0000 (+0100)
Subject: sim: added ldb, stb
X-Git-Tag: bootrom_v1~186
X-Git-Url: http://wien.tomnetworks.com/gitweb/?p=calu.git;a=commitdiff_plain;h=be5651ec3f56d9a6bb057a206be362b5569db522

sim: added ldb, stb
---

diff --git a/3c_disasm/instr/ldb.cpp b/3c_disasm/instr/ldb.cpp
new file mode 100644
index 0000000..bb35be2
--- /dev/null
+++ b/3c_disasm/instr/ldb.cpp
@@ -0,0 +1,87 @@
+#include "../Iinstr.hpp"
+
+
+class Cldb : public Iinstr {
+	public:
+		Cldb();
+		void evalInstr();
+		void execInstr();
+		std::string toString();
+		Iinstr* getNew();
+};
+
+/**
+ * Name:      create_instruction
+ * Purpose:   if compiled as shared library, this functions creates the 
+              instruction object
+
+ * Returns:   pointer to instruction object
+ */
+extern "C" Iinstr* create_instruction() {
+    return new Cldb();
+}
+
+Iinstr* Cldb::getNew()
+{
+    return new Cldb();
+}
+
+/**
+ * Name:      destroy_instruction
+ * Purpose:   if compiled as shared library, this functions destoys the 
+              instruction object
+
+ * Parameter: IInstruction - the instruction object to delete
+ */
+extern "C" void destroy_instruction(Iinstr* p) {
+    delete p;
+}
+
+Cldb::Cldb()
+{
+	opcode = B5(10010);
+	name = "ldb";
+}
+
+void Cldb::evalInstr()
+{
+	this->m_s = true;
+
+	dynamic_bitset<> immb = argbits;
+	immb.resize(15);
+	this->m_imm = this->generate15ImmSign(immb.to_ulong());
+
+	argbits >>= 15;
+	m_ra = this->getRegister(argbits);
+	argbits >>= 4;
+	m_rd = this->getRegister(argbits);
+
+}
+
+#include <iomanip>
+#define AS_HEX std::hex << setw(8) << setfill('0')
+
+void Cldb::execInstr()
+{
+	//cout << "should exec " << this->toString() << endl;
+	CDat val = this->m_cpu->getRegister(this->m_ra);
+	val += m_imm;
+	MEMORY_ADDRESS temp = (val & (~(BYTE_COUNT-1)));
+	CDat offset = val-temp;
+	val = this->m_cpu->getRAM(temp);
+	val = (val >> (offset*8)) & ( ((1<<8)-1));
+	CDat dest = this->m_cpu->getRegister(this->m_rd);
+	dest = dest & (~((1<<8)-1));
+	dest = dest | val;
+	this->m_cpu->setRegister(this->m_rd,dest);
+}
+
+std::string Cldb::toString()
+{
+	stringstream op;
+	op << this->getName();
+
+	op << this->getConditionFlag() << " r" << m_rd << ", " << m_imm << "(r" <<  m_ra << ")";
+
+	return op.str();
+}
diff --git a/3c_disasm/instr/stb.cpp b/3c_disasm/instr/stb.cpp
new file mode 100644
index 0000000..a047a6a
--- /dev/null
+++ b/3c_disasm/instr/stb.cpp
@@ -0,0 +1,92 @@
+#include "../Iinstr.hpp"
+
+
+class Cstb : public Iinstr {
+	public:
+		Cstb();
+		void evalInstr();
+		void execInstr();
+		std::string toString();
+		Iinstr* getNew();
+};
+
+/**
+ * Name:      create_instruction
+ * Purpose:   if compiled as shared library, this functions creates the 
+              instruction object
+
+ * Returns:   pointer to instruction object
+ */
+extern "C" Iinstr* create_instruction() {
+    return new Cstb();
+}
+
+Iinstr* Cstb::getNew()
+{
+    return new Cstb();
+}
+
+/**
+ * Name:      destroy_instruction
+ * Purpose:   if compiled as shared library, this functions destoys the 
+              instruction object
+
+ * Parameter: IInstruction - the instruction object to delete
+ */
+extern "C" void destroy_instruction(Iinstr* p) {
+    delete p;
+}
+
+Cstb::Cstb()
+{
+	opcode = B5(10011);
+	name = "stb";
+}
+
+void Cstb::evalInstr()
+{
+	this->m_s = true;
+
+	dynamic_bitset<> immb = argbits;
+	immb.resize(15);
+	this->m_imm = this->generate15ImmSign(immb.to_ulong());
+
+	argbits >>= 15;
+	m_ra = this->getRegister(argbits);
+	argbits >>= 4;
+	m_rd = this->getRegister(argbits);
+
+}
+
+#include <iomanip>
+#define AS_HEX std::hex << setw(8) << setfill('0')
+
+void Cstb::execInstr()
+{
+	//cout << "should exec " << this->toString() << endl;
+	CDat addr = this->m_cpu->getRegister(this->m_ra);
+	addr += m_imm;
+	MEMORY_ADDRESS temp = (addr & (~(BYTE_COUNT-1)));
+	CDat offset = addr-temp;
+	CDat val = this->m_cpu->getRAM(temp);
+
+	val = val & ~( ((1<<8)-1) << (offset*8));
+
+	//data to insert
+	CDat source = this->m_cpu->getRegister(this->m_rd);
+	source = (source & (((1<<8)-1))) << (offset*8);
+
+	val += source;
+
+	this->m_cpu->setRAM(temp, val);
+}
+
+std::string Cstb::toString()
+{
+	stringstream op;
+	op << this->getName();
+
+	op << this->getConditionFlag() << " r" << m_rd << ", " << m_imm << "(r" <<  m_ra << ")";
+
+	return op.str();
+}