diff options
Diffstat (limited to 'src/ymh15/mips_cpu.cpp')
| -rw-r--r-- | src/ymh15/mips_cpu.cpp | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/src/ymh15/mips_cpu.cpp b/src/ymh15/mips_cpu.cpp index d3d4399..ea7cce1 100644 --- a/src/ymh15/mips_cpu.cpp +++ b/src/ymh15/mips_cpu.cpp @@ -151,21 +151,23 @@ mips_error exec_instruction(mips_cpu_h state, uint32_t inst) { mips_error exec_R(mips_cpu_h state, uint32_t var[8]) { if((var[FUNC]&0xf0) == 0x20 && (var[FUNC]&0xf) < 4) { return add_sub(state, var, ((int32_t)-(var[FUNC]&0xf)/2)*2+1); + } else if((var[FUNC]&0xf0) == 0x20 && (var[FUNC]&0xf) < 7) { + return bitwise(state, var); } - return mips_Success; + return mips_ExceptionInvalidInstruction; } mips_error exec_J(mips_cpu_h state, uint32_t var[8]) { //TODO - return mips_Success; + return mips_ExceptionInvalidInstruction; } mips_error exec_I(mips_cpu_h state, uint32_t var[8]) { //TODO - return mips_Success; + return mips_ExceptionInvalidInstruction; } mips_error add_sub(mips_cpu_h state, uint32_t var[8], int32_t add_sub) { @@ -179,3 +181,14 @@ mips_error add_sub(mips_cpu_h state, uint32_t var[8], int32_t add_sub) { } return mips_ExceptionArithmeticOverflow; } + +mips_error bitwise(mips_cpu_h state, uint32_t var[8]) { + if((var[FUNC]&0xf) == 4) { + state->regs[var[REG_D]] = state->regs[var[REG_S]] & state->regs[var[REG_T]]; + } else if((var[FUNC]&0xf) == 5) { + state->regs[var[REG_D]] = state->regs[var[REG_S]] | state->regs[var[REG_T]]; + } else { + state->regs[var[REG_D]] = state->regs[var[REG_S]] ^ state->regs[var[REG_T]]; + } + return mips_Success; +} |