os-k/src/kaleid/kernel/ke/panic.c

//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Authors:    spectral`                                                     //
//              NeoX                                                          //
//                                                                            //
//  Desc:       How NOT to panic 101                                          //
//----------------------------------------------------------------------------//

#include <kalkern/ke/panic.h>
#include <kalkern/ke/state.h>

#define _UNLOCKED_IO
#include <kalkern/io/terminal.h>

//
//  Panic message
//
const char *__panicmsg = NULL;

//
//  Failed assert() handler
//
noreturn void _assert_handler(const char *msg,
                              const char *file,
                              int line,
                              const char *func)
{
    // not getting out of here
    DisableInterrupts();
    
    (void)file; (void)line; (void)func;
    
    // XXX sprintf() to create a proper panicstr
    StartPanic(msg);
}

//
//  Your best boy panic()
//
void StartPanic(const char *str)
{
    DisableInterrupts();

    SetKernState(KSTATE_PANIC);

    ClearTermUnlocked(stdout);
    
    if (str == NULL) {
        str = "(no message given)";
    }
    
    if (GetPanicStr()) {
        PrintOnTermUnlocked(stdout, "double panic!\n");
        HaltCPU();
    }

    SetPanicStr(str);

    // we cannot lock anything when panicking
    PrintOnTermUnlocked(stdout, "panic! - ");
    PrintOnTermUnlocked(stdout, str);

    while (TRUE) {
        HaltCPU();
    }
}