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Add runtime assembler functions to c64 library

This commit is contained in:
drmortalwombat 2021-11-29 17:43:03 +01:00
parent ea2b59e64d
commit a6fa114a5b
2 changed files with 194 additions and 0 deletions
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173
include/c64/asm6502.h Normal file
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@ -0,0 +1,173 @@
#ifndef C64_ASM_6502_H
#define C64_ASM_6502_H
#include "types.h"
enum AsmIns
{
// Implied
ASM_BRK = 0x00,
ASM_RTI = 0x40,
ASM_RTS = 0x60,
ASM_PHP = 0x08,
ASM_CLC = 0x18,
ASM_PLP = 0x28,
ASM_SEC = 0x38,
ASM_PHA = 0x48,
ASM_CLI = 0x58,
ASM_PLA = 0x68,
ASM_SEI = 0x78,
ASM_DEY = 0x88,
ASM_TYA = 0x98,
ASM_TAY = 0xa8,
ASM_CLV = 0xb8,
ASM_INY = 0xc8,
ASM_CLD = 0xd8,
ASM_INX = 0xe8,
ASM_SED = 0xf8,
ASM_TXA = 0x8a,
ASM_TXS = 0x9a,
ASM_TAX = 0xaa,
ASM_TSX = 0xba,
ASM_DEX = 0xca,
ASM_NOP = 0xea,
// Relative
ASM_BPL = 0x10,
ASM_BMI = 0x30,
ASM_BVC = 0x50,
ASM_BVS = 0x70,
ASM_BCC = 0x90,
ASM_BCS = 0xb0,
ASM_BNE = 0xd0,
ASM_BEQ = 0xf0,
// Generic address
ASM_ORA = 0x01,
ASM_AND = 0x21,
ASM_EOR = 0x41,
ASM_ADC = 0x61,
ASM_STA = 0x81,
ASM_LDA = 0xa1,
ASM_CMP = 0xc1,
ASM_SBC = 0xe1,
ASM_STY = 0x80,
ASM_LDY = 0xa0,
ASM_CPY = 0xc0,
ASM_CPX = 0xe0,
ASM_ASL = 0x02,
ASM_ROL = 0x22,
ASM_LSR = 0x42,
ASM_ROR = 0x62,
ASM_STX = 0x82,
ASM_LDX = 0xa2,
ASM_DEC = 0xc2,
ASM_INC = 0xe2,
// Limited Generic
ASM_BIT = 0x20,
// Jump
ASM_JMP = 0x4c,
ASM_JSR = 0x2c
};
inline void asm_np(byte ** ip, AsmIns ins)
{
(*ip)[0] = ins & 0xff;
(*ip)++;
}
inline void asm_zp(byte ** ip, AsmIns ins, byte addr)
{
(*ip)[0] = (ins & 0xff) | 0x04;
(*ip)[1] = addr;
(*ip) += 2;
}
inline void asm_rl(byte ** ip, AsmIns ins, byte addr)
{
(*ip)[0] = ins & 0xff;
(*ip)[1] = addr;
(*ip) += 2;
}
inline void asm_im(byte ** ip, AsmIns ins, byte value)
{
(*ip)[0] = (ins & 0xff) | ((ins & 0x01) << 3);
(*ip)[1] = value;
(*ip) += 2;
}
inline void asm_zx(byte ** ip, AsmIns ins, byte addr)
{
(*ip)[0] = (ins & 0xff) | 0x05;
(*ip)[1] = addr;
(*ip) += 2;
}
inline void asm_zy(byte ** ip, AsmIns ins, byte addr)
{
(*ip)[0] = (ins & 0xff) | 0x05;
(*ip)[1] = addr;
(*ip) += 2;
}
inline void asm_ab(byte ** ip, AsmIns ins, unsigned addr)
{
(*ip)[0] = (ins & 0xff) ^ 0x0c;
(*ip)[1] = addr & 0xff;
(*ip)[2] = addr >> 8;
(*ip) += 3;
}
inline void asm_in(byte ** ip, AsmIns ins, unsigned addr)
{
(*ip)[0] = (ins & 0xff) ^ 0x2c;
(*ip)[1] = addr & 0xff;
(*ip)[2] = addr >> 8;
(*ip) += 3;
}
inline void asm_ax(byte ** ip, AsmIns ins, unsigned addr)
{
(*ip)[0] = (ins & 0xff) | 0x1c;
(*ip)[1] = addr & 0xff;
(*ip)[2] = addr >> 8;
(*ip) += 3;
}
inline void asm_ay(byte ** ip, AsmIns ins, unsigned addr)
{
(*ip)[0] = (ins & 0xff) | 0x18;
(*ip)[1] = addr & 0xff;
(*ip)[2] = addr >> 8;
(*ip) += 3;
}
inline void asm_ix(byte ** ip, AsmIns ins, byte addr)
{
(*ip)[0] = (ins & 0xff) | 0x00;
(*ip)[1] = addr;
(*ip) += 2;
}
inline void asm_iy(byte ** ip, AsmIns ins, byte addr)
{
(*ip)[0] = (ins & 0xff) | 0x01;
(*ip)[1] = addr;
(*ip) += 2;
}
#endif

21
oscar64/NativeCodeGenerator.cpp
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@ -1560,6 +1560,27 @@ bool NativeCodeInstruction::ValueForwarding(NativeRegisterDataSet& data, AsmInsT
int c = t >= 256;
if (t && !data.mRegs[CPU_REG_C].mValue)
carryop = ASMIT_SEC;
else if (!t && data.mRegs[CPU_REG_C].mValue)
carryop = ASMIT_CLC;
changed = true;
}
else if (mMode == ASMIM_IMMEDIATE_ADDRESS && data.mRegs[CPU_REG_A].mMode == NRDM_IMMEDIATE_ADDRESS && mLinkerObject == data.mRegs[CPU_REG_A].mLinkerObject)
{
int t;
if (mFlags & NCIF_LOWER)
t = (mAddress ^ 0xffff) + data.mRegs[CPU_REG_A].mValue + data.mRegs[CPU_REG_C].mValue;
else
t = ((mAddress ^ 0xffff) >> 8) + data.mRegs[CPU_REG_A].mValue + data.mRegs[CPU_REG_C].mValue;
mType = ASMIT_LDA;
mMode = ASMIM_IMMEDIATE;
mAddress = t & 0xff;
int c = t >= 256;
if (t && !data.mRegs[CPU_REG_C].mValue)
carryop = ASMIT_SEC;
else if (!t && data.mRegs[CPU_REG_C].mValue)