DOS ain't dead - trip report: Tiny C Compiler 0.9.27

trip report: Tiny C Compiler 0.9.27 (Miscellaneous)

posted by tkchia , 04.02.2026, 17:55
(edited by tkchia on 04.02.2026, 18:18)

Hello bencollver,

For the first attempt: the instructions at cs:eip disassemble to

000009E9 F367A4 rep a32 movsb 000009EC F7C700FF test di,0xff00 000009F0 7503 jnz 0x9f5 000009F2 B00D mov al,0xd 000009F4 AA stosb

when interpreted as 16-bit code...

Apparently the rep a32 movsb caused an exception because it was trying to write to es:[0x100], and the upper limit of es was 0xff.

My wild guess is that the command line arguments as seen by tcc were too long, and some part(s) of the runtime (maybe the bootstrapping C library, or maybe HXRT, etc. ...) did not handle over-long command line arguments properly. I suppose it might be useful to see where the above code instructions were coming from...

Thank you!

---
https://codeberg.org/tkchia · https://disroot.org/tkchia · 😴 "MOV AX,0D500H+CMOS_REG_D+NMI"

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Complete thread:

trip report: Tiny C Compiler 0.9.27 - bencollver, 04.02.2026, 17:02 (Miscellaneous)
- trip report: Tiny C Compiler 0.9.27 - tkchia, 04.02.2026, 17:55
  - trip report: Tiny C Compiler 0.9.27 - bencollver, 04.02.2026, 18:48
    - trip report: Tiny C Compiler 0.9.27 - Japheth, 04.02.2026, 21:12
      - trip report: Tiny C Compiler 0.9.27 - bencollver, 04.02.2026, 21:44
      - trip report: Tiny C Compiler 0.9.27 - bretjohn, 05.02.2026, 22:24
        trip report: Tiny C Compiler 0.9.27 - Rugxulo, 05.02.2026, 23:09
        trip report: Tiny C Compiler 0.9.27 - bretjohn, 06.02.2026, 01:59
    - trip report: Tiny C Compiler 0.9.27 - bencollver, 04.02.2026, 21:38
      - trip report: Tiny C Compiler 0.9.27 - tkchia, 05.02.2026, 16:44
        trip report: Tiny C Compiler 0.9.27 - bencollver, 05.02.2026, 18:34
        trip report: Tiny C Compiler 0.9.27 - bencollver, 05.02.2026, 22:22
        trip report: Tiny C Compiler 0.9.27 - tkchia, 05.02.2026, 23:13
        trip report: Tiny C Compiler 0.9.27 - Rugxulo, 05.02.2026, 23:16
        trip report: Tiny C Compiler 0.9.27 - tkchia, 05.02.2026, 23:18
        trip report: Tiny C Compiler 0.9.27 - tkchia, 06.02.2026, 23:45
- trip report: Tiny C Compiler 0.9.27 - bencollver, 11.02.2026, 00:44
  - trip report: Tiny C Compiler 0.9.27 - Rugxulo, 11.02.2026, 01:42
    - trip report: Tiny C Compiler 0.9.27 - bencollver, 11.02.2026, 02:06