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* Implement even deprecated BEQL, BNEL, BLEZL, BGTZL, BLTZL, BGEZL, BLTZALL, ↵Pavel Pisa2019-02-08
| | | | | | | | BGEZALL. GCC generates these opcodes for default compilation mode. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Make function to register exception handler accessible from outside.Pavel Pisa2019-02-08
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implement LL and SC as simple load and store word. SC returns 1 unconditionally.Pavel Pisa2019-02-08
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Add write and read notification to the simple peripheral component.Pavel Pisa2019-02-08
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Exception handlers require even PC of the jump or branch instruction before ↵Pavel Pisa2019-02-07
| | | | | | | | | | | delay slot. When exception occurs at instruction in delay slot, the address of branch/delay instruction is stored to EPC instead of address of instruction causing the exception. So that address has to be delivered to exception handling object. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* View register numbers in decimal notation.Pavel Pisa2019-02-07
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct cache LocationStatus when cache is disabled.Pavel Pisa2019-02-07
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implemented simple indication of presence of memory location in the cache.Pavel Pisa2019-02-07
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Added method to retrieve memory location status.Pavel Pisa2019-02-07
| | | | | | | It can inform if given location is cached or if given range is invalid in address space. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct display of jump and branch instructions.Pavel Pisa2019-02-07
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Add address to emitted instruction to allow its use for branch address decoding.Pavel Pisa2019-02-07
| | | | | | | | The new Qt5 syntax is used to create connections because old syntax does not work with multiple arguments for some unresolved reason. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implemented basic infrastructure to handle exceptions.Pavel Pisa2019-02-07
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implement BSHFL instruction and ignore RDHWR instruction.Pavel Pisa2019-02-07
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* Remove dependency of ALU operation encoding on MIPS instruction format.Pavel Pisa2019-02-07
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct BLTZAL and BGEZAL execution to pass unmodified value to R31.Pavel Pisa2019-02-07
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implemented base for exception handling.Pavel Pisa2019-02-06
| | | | | | | | | | | | | | Memory stage is chosen to be exception commit stage. Instructions flow postponed and stages holding following instructions are cleaned. Processing of syscall at decode stage as jump to the handler would be better solution in real hardware but for future emulated syscalls it is better to reach consistent state of registers. Memory access caused exceptions would require cleanup even in real hardware. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Resolve some memory leaks found by Valgrind.Pavel Pisa2019-02-06
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Provide at least partial cleanup after QtMipsMachine.Pavel Pisa2019-02-06
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implement simple address-space ranges registration and example peripheral.Pavel Pisa2019-02-06
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct registers order in conversion to text for branch instructions.Pavel Pisa2019-02-06
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* No reorder has to be specified else addi is moved to j delay slot.Pavel Pisa2019-02-05
| | | | | | All tests are passing now. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Include test for BGEZ, BGTZ, BLEZ, BLTZ, BEQ and BNE.Pavel Pisa2019-02-05
| | | | | | | This complex test check for correct behavior for -1, 0 and 1 values. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Reorganize PC handling and implement full REGIMM decode.Pavel Pisa2019-02-05
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct shift operation and make ALU_OP_MOVZ and ALU_OP_MOVN encoding ↵Pavel Pisa2019-02-05
| | | | | | independent. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Make instruction to text conversion more generic.Pavel Pisa2019-02-05
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Rewrite instruction decoding to be generic and mostly architecture independent.Pavel Pisa2019-02-05
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Setup initial PC according executable entry form ELF file if it is non zero.Pavel Pisa2019-02-04
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Define uncached region in range from 0xf0000000 to 0xffffffff.Pavel Pisa2019-02-04
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Remove almost all direct access to opcode and function from the core.Pavel Pisa2019-02-04
| | | | | | | Remaining are MOVZ and MOVN in the execution phase and all branch and jump operations in handle_pc(). Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Take into account actual requirements for rs, rt and rd write for individual ↵Pavel Pisa2019-02-04
| | | | | | instructions. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Unified instructions table and access type move to machinedefs.h .Pavel Pisa2019-02-04
| | | | | | | This allows to specify requirement for RS and RD on instruction basis even for T_R / ALU instructions. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Include more complex insert-sort test which checks memory and cache.Pavel Pisa2019-02-04
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Primitive implementation of cache instruction.Pavel Pisa2019-02-04
| | | | | | | When any variant of cache instruction is detected flush and invalidate whole data cache. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Simplify core test by use of common function to run test machine.Pavel Pisa2019-02-04
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Add license to the source files.Pavel Pisa2019-02-04
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct write-back cache behavior.Pavel Pisa2019-02-04
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct memory view updates for uncached and write-through case.Pavel Pisa2019-02-03
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implement BREAK instruction to stop continuous execution.Pavel Pisa2019-02-03
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implement instructions MULT, MULTU, DIV, DIVU.Pavel Pisa2019-02-03
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implement realistic hazard resolution for JR, JALR, BEQ, BNE, BLTZ, BGEZ ↵Pavel Pisa2019-02-02
| | | | | | | | | | | instructions. The previous code worked by chance only because decode has been fully processed including forwarding from M and W before PC processing started. But in real hardware the PC processing runs in parallel with ALU and cannot read its results in the same cycle. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Include test for jump and link processing.Pavel Pisa2019-02-02
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Add test for forwarding in ALU operations.Pavel Pisa2019-02-02
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct ALU test for SUB exception.Pavel Pisa2019-02-02
| | | | | | | | | | | | The operation 3 - 4 = 1 is legal integer arithmetic operation. Changed to 0x80000003 - 4 = 0x7fffffff 2147483651 - 4 = 2147483647 which overflows. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Include support for JALR support.Pavel Pisa2019-01-31
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Initial support for JAL.Pavel Pisa2019-01-31
| | | | | | | The JR, BEQ, BNE are most probably incorrect still. There is missing forwarding for pipelined execution. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct signed arithmetic overflow exception.Pavel Pisa2019-01-31
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Display rs, rt, rd and write register number in all stages.Pavel Pisa2019-01-31
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct processing of ORI, ANDI, XORI instructions which require ↵Pavel Pisa2019-01-31
| | | | | | zero-extended immediate. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Do not replace rt by forward if instruction in T_R or store.Pavel Pisa2019-01-30
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Display execution stage forward signals in the view.Pavel Pisa2019-01-30
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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