/*
    * TerminationCodes.hpp
    * MontaukOS process termination codes.
    * Copyright (c) 2026 Daniel Hammer
*/

#pragma once

#include <cstdint>

// Exit code recorded when the kernel ends a process, as opposed to the
// process calling SYS_EXIT (which is masked to 0..255). Encoded as
// 256 + POSIX signal number so libc waitpid can report WTERMSIG.
// Mirrored in userspace at programs/include/montauk/statuscodes.h.
enum TerminationCodes {
    TerminationBase = 256,
    TerminatedIllegalInstruction = TerminationBase + 4,     // SIGILL
    TerminatedBreakpoint = TerminationBase + 5,             // SIGTRAP
    TerminatedAborted = TerminationBase + 6,                // SIGABRT
    TerminatedArithmeticError = TerminationBase + 8,        // SIGFPE
    TerminatedKilled = TerminationBase + 9,                 // SIGKILL
    TerminatedAccessViolation = TerminationBase + 11        // SIGSEGV
};

// Termination code for a user-mode CPU exception. The exact vector is
// kept in the crash report; this is only the category.
inline TerminationCodes TerminationFromVector(uint8_t vector) {
    switch (vector) {
        case 0x06: return TerminatedIllegalInstruction;     // #UD
        case 0x01:                                          // #DB
        case 0x03: return TerminatedBreakpoint;             // #BP
        case 0x00:                                          // #DE
        case 0x10:                                          // #MF
        case 0x13: return TerminatedArithmeticError;        // #XM
        default:   return TerminatedAccessViolation;        // #PF, #GP, #SS, #NP, #AC, #OF, #BR, #CP, ...
    }
}