diff options
Diffstat (limited to 'qtmips_machine/alu.cpp')
| -rw-r--r-- | qtmips_machine/alu.cpp | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/qtmips_machine/alu.cpp b/qtmips_machine/alu.cpp index 554874a..07e174e 100644 --- a/qtmips_machine/alu.cpp +++ b/qtmips_machine/alu.cpp @@ -1,7 +1,7 @@ #include "alu.h" #include "qtmipsexception.h" -std::uint32_t alu_operate(enum AluOp operation, std::uint32_t s, std::uint32_t t, std::uint8_t sa) { +std::uint32_t alu_operate(enum AluOp operation, std::uint32_t s, std::uint32_t t, std::uint8_t sa, Registers *regs) { switch(operation) { case ALU_OP_SLL: return t << sa; @@ -17,6 +17,16 @@ std::uint32_t alu_operate(enum AluOp operation, std::uint32_t s, std::uint32_t t case ALU_OP_SRAV: // TODO is this correct implementation? (Should we be masking top most bit?) return ((t & 0x7fffffff) >> s) | (t & 0x80000000); + case ALU_OP_MFHI: + return regs->read_hi_lo(true); + case ALU_OP_MTHI: + regs->write_hi_lo(true, s); + return 0x0; + case ALU_OP_MFLO: + return regs->read_hi_lo(false); + case ALU_OP_MTLO: + regs->write_hi_lo(false, s); + return 0x0; case ALU_OP_ADD: if (s > (0xFFFFFFFF - t)) throw QTMIPS_EXCEPTION(Overflow, "ADD operation overflow/underflow", QString::number(s) + QString(" + ") + QString::number(t)); |