kvisc/vm/pc/except.h

// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#define IDT_SLOTS 1024

extern ulong **rfs;
extern size_t rfs_current_idx;

extern ulong idt[IDT_SLOTS];
extern bool idt_masked[IDT_SLOTS];   // delibarately masked by software
extern bool idt_handling[IDT_SLOTS]; // a handler is already running

enum
{
    E_SHT,          // Shutdown instruction
    E_UDF,          // Undefined behavior
    E_ILL,          // Ill-formed instruction
    E_ACC,          // Invalid memory access
    E_SYS,          // Supervisor only
    E_DBF,          // Double fault
    E_IMP,          // Not implemented
    E_ALI,          // Alignment error
    E_STA,          // Stack misalignment
    E_STU,          // Stack underflow
    NEXCPTS
};

extern int dying;

void main_loop(void) __attribute__((__noreturn__));
void _except(ctx_t *, int, char *, ...) __attribute__((__noreturn__));