Complete guide to obscure CPU error codes

[Black Phoenix]

I think I've posted this earlier, but I'm reposting it here for easy access. It's a complete guide to obscure CPU errors:

A guide to CPU interrupts & error codes

LADD - register that holds interrupt error code, or address of error

Error code | Meaning
     0     | No error ("int 0" will restart CPU)
           |
     1     | CPU was stopped by program ("int 1" will stop CPU)
           |
     2     | End of program execution. It has two meanings:
           |  1. Your program has ended (it was not looped)
           |  2. CPU tried to run opcode 0 ("stop")
           |
     3     | Division by zero. LADD tells you what opcode it was
           | LADD : Meaning
           |   0  : DIV
           |   1  : FINV
     4     | Unknown opcode. LADD holds opcode number
           |
     5     | Internal processor error. LADD holds error code
           | LADD : Meaning
           |  01  : Opcode returned invalid value
           |  02  : Unknown internal error
           |  12  : Read error while fetching Opcode or RM
           |  22  : Could not peek immediate byte 1
           |  32  : Could not peek immediate byte 2
           |  42  : Invalid RM parameter for operand 1
           |  52  : Invalid RM parameter for operand 2
           |  62  : Target operand not writeable
           |  72  : Source operand not writeable (XCHG only)
           |  82  : Executing unkown opcode without interrupt 4
           |
     6     | Stack error:
           |  Overflow:  ESP = 0;   LADD = 0;
           |  Underflow: ESP = ESZ; LADD = ESZ;
           |  Unable to read value from stack: LADD = ESP;
           |
     7     | Memory read/write fault. LADD = Faulty address
           |
     8     | MemBus or IOBus fault. LADD = Faulty address (ports are negative)
           |
     9     | Write access violation. LADD = Faulty address
           |
    10     | Port read/write fault. LADD = Port number
           |
    11     | Page access violation. LADD = Page number
           | Triggered by SPG, CPG, SPP, CPP, SRL, SMAP
           |
    12     | Read access violation. LADD = Faulty address
           |
    13     | General processor fault
           | LADD : Meaning
           |   1  : Trying to write CS
           |   3  : Interrupt number out of range (0..255)
           |   4  : Trying to call NMI interrupt without NMI flag set
           | <...>: Opcode number of executed privileged opcode, one of:
           |        RD WD STI CLI STP CLP STE CLE NMIINT ERPG WRPG RRPG LIDTR
           |        NMIRET IDLE CPUSET CPP SPP SRL SMAP
           |
    14     | Execute violation. LADD = Page number
           |
    15     | Address space violation. LADD = Faulty address
           |
    16     | [GPU ONLY] Pants integrity violation
           |
    23     | [GPU ONLY] String read error.
           | If character out of 0..255 range, then LADD = character
           | If string longer than 8192 chars, then LADD = 0

LADD is the code you see after decimal fraction point (e.g. 5.12)

[Vbitz]

sweet first resort place, good thing to have running in the text editor at all times.
oh yeah does each program run in a virtul machine

[Black Phoenix]

sweet first resort place, good thing to have running in the text editor at all times.
oh yeah does each program run in a virtul machine

Yes, every program does

[Vbitz]

does it use things like protected mode layers and suport drivers

[Black Phoenix]

does it use things like protected mode layers and suport drivers

What do you mean? It's a virtual machine, just runs the program as processor would

[-HP-]

Oh! That one time I used CPU I was wondering why the error codes had decimals. Thanks
What does ladd stand for?

[Black Phoenix]

Oh! That one time I used CPU I was wondering why the error codes had decimals. Thanks
What does ladd stand for?

Last address, it's a name that carried on from earlier CPU version.

[Schilcote]

What are privileged opcodes?

[Matte]

This could come in handy. Thanks!

[SuperLlama]

For some reason, the (sock) LINT register doesn't work. I was planning on setting all interrupts to a function that interpreted LINT and LADD and generated an error message, but then three was lost... (LINT didn't work)

Any idea why it doesn't recognize this register?