Function OSExceptionInit

src/dolphin/src/os/OS.c:419–505

* --INFO-- * Address: 800EB654 * Size: 000280 */

 * Size:	000280
 */
static void OSExceptionInit(void)
{
    __OSException exception;
    void* destAddr;

    // These two vars help us change the exception number embedded
    // in the exception handler code.
    u32* opCodeAddr;
    u32 oldOpCode;

    // Address range of the actual code to be copied.
    u8* handlerStart;
    u32 handlerSize;

    // Install the first level exception vector.
    opCodeAddr = (u32*)__OSEVSetNumber;
    oldOpCode = *opCodeAddr;
    handlerStart = (u8*)__OSEVStart;
    handlerSize = (u32)((u8*)__OSEVEnd - (u8*)__OSEVStart);

    // Install the DB integrator, only if we are the first OSInit to be run
    destAddr = (void*)OSPhysicalToCached(OS_DBJUMPPOINT_ADDR);
    if (*(u32*)destAddr == 0) // Lomem should be zero cleared only once by BS2
    {
        DBPrintf("Installing OSDBIntegrator\n");
        memcpy(destAddr, (void*)__OSDBINTSTART, (u32)__OSDBINTEND - (u32)__OSDBINTSTART);
        DCFlushRangeNoSync(destAddr, (u32)__OSDBINTEND - (u32)__OSDBINTSTART);
        __sync();
        ICInvalidateRange(destAddr, (u32)__OSDBINTEND - (u32)__OSDBINTSTART);
    }

    // Copy the right vector into the table
    for (exception = 0; exception < __OS_EXCEPTION_MAX; exception++)
    {
        if (BI2DebugFlag && (*BI2DebugFlag >= 2) && __DBIsExceptionMarked(exception))
        {
            // this DBPrintf is suspicious.
            DBPrintf(">>> OSINIT: exception %d commandeered by TRK\n", exception);
            continue;
        }

        // Modify the copy of code in text before transferring
        // to the exception table.
        *opCodeAddr = oldOpCode | exception;

        // Modify opcodes at __DBVECTOR if necessary
        if (__DBIsExceptionMarked(exception))
        {
            DBPrintf(">>> OSINIT: exception %d vectored to debugger\n", exception);
            memcpy((void*)__DBVECTOR, (void*)__OSDBJUMPSTART,
                   (u32)__OSDBJUMPEND - (u32)__OSDBJUMPSTART);
        }
        else
        {
            // make sure the opcodes are still nop
            u32* ops = (u32*)__DBVECTOR;
            int cb;