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Rev 3123 Rev 3125
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{
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{
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    istate->r0 = syscall_handler(istate->r0, istate->r1, istate->r2,
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    istate->r0 = syscall_handler(istate->r0, istate->r1, istate->r2,
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        istate->r3, istate->r4, istate->r5, istate->r6);
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        istate->r3, istate->r4, istate->r5, istate->r6);
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}
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}
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/** Data abort exception handler.
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 *
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 * Determines whether the exception was caused by a breakpoint
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 * instruction or a page fault.
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 */
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static void data_abort_exception(int exc_no, istate_t *istate)
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{
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    uint32_t *instr_addr = (uint32_t *) istate->pc;
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    uint32_t opcode = *instr_addr;
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    if ((opcode & 0xfff000f0) == 0xe1200070) {
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        /* Bkpt */
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        if (istate_from_uspace(istate)) {
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            udebug_breakpoint_event(0);
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        } else {
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            panic("Unexpected BKPT instruction at 0x%x",
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                istate->pc);
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        }
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    } else {
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        /* Page fault */
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        data_abort(exc_no, istate);
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    }
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}
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/** Interrupt Exception handler.
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/** Interrupt Exception handler.
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 *
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 *
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 * Determines the sources of interrupt and calls their handlers.
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 * Determines the sources of interrupt and calls their handlers.
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 */
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 */
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static void irq_exception(int exc_no, istate_t *istate)
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static void irq_exception(int exc_no, istate_t *istate)
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    install_exception_handlers();
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    install_exception_handlers();
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    exc_register(EXC_IRQ, "interrupt", (iroutine) irq_exception);
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    exc_register(EXC_IRQ, "interrupt", (iroutine) irq_exception);
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    exc_register(EXC_PREFETCH_ABORT, "prefetch abort",
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    exc_register(EXC_PREFETCH_ABORT, "prefetch abort",
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        (iroutine) prefetch_abort);
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        (iroutine) prefetch_abort);
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    exc_register(EXC_DATA_ABORT, "data abort",
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    exc_register(EXC_DATA_ABORT, "data abort", (iroutine) data_abort);
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        (iroutine) data_abort_exception);
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    exc_register(EXC_SWI, "software interrupt", (iroutine) swi_exception);
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    exc_register(EXC_SWI, "software interrupt", (iroutine) swi_exception);
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}
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}
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/** Prints #istate_t structure content.
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/** Prints #istate_t structure content.
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 *
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 *