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Advantage using software interrupt (SWI)

Thomas Johansen

Hallo

Im just wondering what the advantage is of using software interrupt instead og a function call?

Is the SWI faster? Cant it be disturbed by another interrupt?

/Thomas

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  • 0 in reply to Thomas Johansen

    One use for SWI instructions is for compiler implementors. In the Armaide Oberon-07 Development system, runtime errors generate SWI instructions. e.g. array indices are checked against array bounds. If the element being accessed is out of range an SWI instruction is generated to call a trap routine which can then return to a suitable recovery point that you have defined in your program.

    All you need to do is add the following procedure call at the location in your application that you want to return to:

    LPC.SetTrapReturn(SYSTEM.FP, SYSTEM.SP, SYSTEM.PC + 0);

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  • 0 in reply to Thomas Johansen

    One use for SWI instructions is for compiler implementors. In the Armaide Oberon-07 Development system, runtime errors generate SWI instructions. e.g. array indices are checked against array bounds. If the element being accessed is out of range an SWI instruction is generated to call a trap routine which can then return to a suitable recovery point that you have defined in your program.

    All you need to do is add the following procedure call at the location in your application that you want to return to:

    LPC.SetTrapReturn(SYSTEM.FP, SYSTEM.SP, SYSTEM.PC + 0);

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