SYSCALL 5 not implemented in CLI mode

[Anyone789]

Version: 1.3.0, 2023-10-17T18:28:27.407233900, master@f7753dc JRE version: 21.0.5 OS: Linux

java.lang.NullPointerException: Cannot invoke "org.edumips64.utils.io.Writer.write(String)" because "w" is null
        at org.edumips64.core.IOManager.write(IOManager.java:246)
        at org.edumips64.core.is.SYSCALL.MEM(SYSCALL.java:255)
        at org.edumips64.core.CPU.stepMEM(CPU.java:551)
        at org.edumips64.core.CPU.step(CPU.java:403)
        at org.edumips64.utils.cli.RunCommand.execute(RunCommand.java:29)
        at org.edumips64.utils.cli.RunCommand.run(RunCommand.java:17)
        at picocli.CommandLine.executeUserObject(CommandLine.java:2026)
        at picocli.CommandLine.access$1500(CommandLine.java:148)
        at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2461)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2453)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2415)
        at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2273)
        at picocli.CommandLine$RunLast.execute(CommandLine.java:2417)
        at picocli.CommandLine.execute(CommandLine.java:2170)
        at org.edumips64.CliRunner.handleTokens(CliRunner.java:80)
        at org.edumips64.CliRunner.runReplLoop(CliRunner.java:69)
        at org.edumips64.CliRunner.start(CliRunner.java:56)
        at org.edumips64.Main.startCli(Main.java:244)
        at org.edumips64.Main.main(Main.java:155)

Loaded file:
; Autor reseni: jmeno prijmeni login

; Projekt 2 - INP 2024
; Vigenerova sifra na architekture MIPS64

; DATA SEGMENT
                .data
msg:            .asciiz "Hello world!" ; sem doplnte vase "jmenoprijmeni"
cipher:         .space  31 ; misto pro zapis zasifrovaneho textu
; zde si muzete nadefinovat vlastni promenne ci konstanty,
; napr. hodnoty posuvu pro jednotlive znaky sifrovacho klice

params_sys5:    .space  8 ; misto pro ulozeni adresy pocatku
                          ; retezce pro vypis pomoci syscall 5
                          ; (viz nize "funkce" print_string)

; CODE SEGMENT
                .text

main:           ; ZDE NAHRADTE KOD VASIM RESENIM
                daddi   r4, r0, msg ; vozrovy vypis: adresa msg do r4
                jal     print_string ; vypis pomoci print_string - viz nize

; NASLEDUJICI KOD NEMODIFIKUJTE!

                syscall 0   ; halt

print_string:   ; adresa retezce se ocekava v r4
                sw      r4, params_sys5(r0)
                daddi   r14, r0, params_sys5    ; adr pro syscall 5 musi do r14
                syscall 5   ; systemova procedura - vypis retezce na terminal
                jr      r31 ; return - r31 je urcen na return address

[lupino3]

Thank you for the bug report, @Anyone789! Let me try to reproduce it and fix it.

[lupino3]

I see that you are running the simulator with the --headless option, to use the CLI UI.

Unfortunately, some I/O syscalls are not implemented in the CLI version as of now, so it is known that they don't work.

We should be handling this failure a bit more gracefully, though.

Just for good measure, I tested the GUI version and it works as expected. I'll rename this issue and use it to track this new feature.

[lupino3]

Need to do something similar to https://github.com/EduMIPS64/edumips64/blob/master/src/main/java/org/edumips64/Main.java#L377-L384

[lupino3]

Fixed in master, thanks for the report @Anyone789