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* Set gray background to stalled instructions/idled stages.Pavel Pisa2019-03-31
| | | | | | This allows to easier identify unused pipeline stages. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Change single cycle core with delay slot to use separate fetch stage.Pavel Pisa2019-03-26
| | | | | | | | | | | | When instructions are visualized then it is even more misleading to keep old instruction in decode phase delay buffer. The single cycle core with delay slot is upgraded to the variant with fetch and execute phases. This way the structure is logical and delay slot has purpose. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Highlight instructions passing through the pipeline stages.Pavel Pisa2019-03-25
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct write through spelling. Reported by Richard Susta.Pavel Pisa2019-03-25
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Extend qtmips_cli to recognize break and report final state.Pavel Pisa2019-03-24
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Registers and cop0 state updates and reads are visualized by highlights.Pavel Pisa2019-03-17
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Highlight actual word read or written to the cache.Pavel Pisa2019-03-17
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct word in block visualization in cache view.Pavel Pisa2019-03-17
| | | | | | | The word index (column) has been erroneously used for set index value. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Make use of QVERIFY_EXCEPTION_THROWN conditional, it is not available on ↵Pavel Pisa2019-03-15
| | | | | | Ubuntu Trusty. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Switch to static libraries by default and ensure application rebuild when a ↵Pavel Pisa2019-03-15
| | | | | | | | | | | | | | | | library changes. I have not found a way how to pass additional CONFIG options to Debian package build (dpkg-buildpackage) when qmake is invoked from debian/rules with debian helper based (dh) build. The way how qmake solves dependencies between program and libraries comes from stone age. It is necessary to include complete path to the library in PRE_TARGETDEPS definition including lib prefix and .a suffix. This is non portable and cannot be easily used when static and dynamic libraries build alternatives are considered. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Allow byte and half-word access to the peripherals.Pavel Pisa2019-03-13
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Fix LB and LH sign extension and LH/SH mask calculation.Pavel Pisa2019-03-13
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct use of uninitialized dt_d.num_rd and delete reported by valgrind.Pavel Pisa2019-03-12
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Fix program end by exception if divisor is zero for div instruction.Pavel Pisa2019-03-10
| | | | | | | | | | | | | | | | | | | | Problem reported by Jakub Broz. Correct behaviour according to MIPS Architecture for Programmers Volume II-A: The MIPS32 Instruction Set Manual which describes DIV instruction Format: DIV rs, rt No arithmetic exception occurs under any circumstances. Restrictions: If the divisor in GPR rt is zero, the arithmetic result value is UNPREDICTABLE. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Updated read and write, added open, close, ftruncate syscalls and fs_root ↵Pavel Pisa2019-03-09
| | | | | | | | | | | option. When operating system emulation root directory (fs_root) are selected then open() syscall opens real host system files in this limited subtree. When fs_root is not set then console is mapped to all read, write, open and close calls. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct exception setup - break and HW break should cause stop and step over.Pavel Pisa2019-03-06
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Enable configuration of syscalls emulation and stop on exception.Pavel Pisa2019-03-06
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Suppress warning where case fall-through is intentional.Pavel Pisa2019-03-06
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct parsing of register + offset operands, i.e., LW and SW.Pavel Pisa2019-03-06
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Try the strict check of encoded instructions and relax break and other.Pavel Pisa2019-03-05
| | | | | | | Some instructions can have fields to be used by operating system or for error reporting by user. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Complete revamp of disassembler and assembler arguments processing.Pavel Pisa2019-03-05
| | | | | | | | | | | | | | | | | | | | | Instructions description in instruction.cpp has been pragmatically augmented by tool based on Python MIPS simulator, hazards analyzer https://github.com/ppisa/apo-simarch That code has been originally distilled from from GNU binutils sources. Implementation is now inline with my original proposal Previous solution gets untenable with more complex instructions and its complexity would grow extremely. MIPS instruction set with coprocessor instructions which use sel field, rd used as index, rt as destination and other peculiarities in newer versions cannot be processed based on basic CPU control signals. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Dock to view coprocessor 0 and cop0 counter/comparator support.Pavel Pisa2019-03-05
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Use irq 3 (HW1) for Rx and irq 2 (HW0) for Tx to be compatible with SPIM.Pavel Pisa2019-03-04
| | | | | | | Jump to address 0x8000180 by default and to EBase + 0x180 when EBase is set to be compatible with real MIPS CPU. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implemented interrupt delivery and processing for serial port.Pavel Pisa2019-03-04
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implemented coprocessor 0 registers access and register EPC and Cause set by ↵Pavel Pisa2019-03-04
| | | | | | exception. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Simple serial port receive implementation.Pavel Pisa2019-02-25
| | | | | | | | | Simple polled mode serial port input implemented for serial port peripheral and for read and readv system calls. When end of input character reserve is reached for read/readv, newline is automatically appended. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Exceptions causes align with SPIM and add serial port range alias equivalent ↵Pavel Pisa2019-02-25
| | | | | | to SPIM. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Change serial port peripheral to match SPIM registers definition.Pavel Pisa2019-02-25
| | | | | | | Still Tx only and keep 0xffffc000 base to allows single instruction LW and SW access. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct relative jumps range and adjust it for single core without delay-slot.Pavel Pisa2019-02-24
| | | | | | | | | | | | Setting bits 16 to 31 to 1 is incorrect, offset is shift by two so bit 16 can be zero for jumps in range -64k to -128k. Adjust relative offsets to compute target address same, as if there is delay slot, for CPU variant without delay slot. This allows to use same/standard MIPS assembler for mode without delay slots. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implement ROTR and ROTRV and full decode of WSBH, SEB and SEH.Pavel Pisa2019-02-24
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Add some more labels and clarify rs, rt, rd in execute stage.Pavel Pisa2019-02-24
| | | | | | | This allows simple visual compare of rs and rt in execution stage with register number to be written in memory and write-back stages. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Add support for goto to selected symbol address.Pavel Pisa2019-02-22
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Ensure that cache view and memory status are updated after cache flush.Pavel Pisa2019-02-21
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Added test for LWR, LWL, SWR and SWL instructions.Pavel Pisa2019-02-21
| | | | | | | The reference data has been obtained by running application under userspace MIPS QEMU. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Add burst time and store timing in the config.Pavel Pisa2019-02-21
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Distinguish between write-through cache with allocate and update only if hit.Pavel Pisa2019-02-20
| | | | | | | Add into cache statistic number of backing/main memory accesses. Correction of meaning and computation of the cache statistic. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Update project files to adapt for release and debug libraries location for ↵Pavel Pisa2019-02-19
| | | | | | Windows builds. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Clear LFU statistic for the kicked out cache-line.Pavel Pisa2019-02-18
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Report forward and stall for branches and add forward to execution phase.Pavel Pisa2019-02-18
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Correct ADD operation to map to ALU variant with overflow checking.Pavel Pisa2019-02-18
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Visualize request to stall and stall in execution phase and exception sources.Pavel Pisa2019-02-18
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Stall the pipeline even for branch which requires memory read as argument.Pavel Pisa2019-02-18
| | | | | | | | | | This type of the hazard doe not cause problems in the simulator because processing of memory stage is already finished at time when PC handling is started but it would cause problems in real hardware where PC handling is processed in parallel to memory load. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Do not update instruction in the decode stage when stalled.Pavel Pisa2019-02-17
| | | | | | | Decode dt_d represents next input to execute stage not state of decode stage at this moment. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Ignore LWC1, LWD1, SWC1 and SDC1 instructions.Pavel Pisa2019-02-17
| | | | | | This allows to use MUSL Lib C printf and scanf implementations. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Pass arithmetic exception trough pipeline and implement trap support and ↵Pavel Pisa2019-02-17
| | | | | | instructions. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Change RGB LEDs signals and slots to unsigned value.Pavel Pisa2019-02-16
| | | | | | | Signed value caused in the conversion incorrect behavior for some corner cases. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Multiply and accumulate and CLZ/CLO operations added.Pavel Pisa2019-02-15
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Implement EXT instruction used in GLIBC startup.Pavel Pisa2019-02-15
| | | | | | It requires one more field to pass to ALU. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Core: move complex memory operation to own function and implement LWL, LWR, ↵Pavel Pisa2019-02-15
| | | | | | | | SWL, SWR. The move makes basic memory stage processing more readable. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Fill the rest of ALU opcode table to file all 64 entries.Pavel Pisa2019-02-14
| | | | Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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