Emulation of asynchronous signals using a branch mechanism

Details Emulation of asynchronous signals using a branch mechanism Emulation of asynchronous signals using a branch mechanism

1996-07-31

1998-06-09

Teska, Kevin J.

395705, 395733, G06F 940

Patent

active

057649626

ABSTRACT:
A method facilitates transfer of control from normal emulation in an emulation system to an asynchronous signal handler in the emulation system. A branch-target register is globally allocated with an address used to transfer control to the asynchronous signal handler. A predicate register is globally allocated to serve as a Boolean flag. Within each of a plurality of blocks of code within the emulation system there is placed a transfer of control operation. The transfer of control operation uses as a predicate the globally allocated predicate register. The transfer of control operation branches to an address stored in the globally allocated branch-target register. Where allowed in the architecture, a prefetch hint for the transfer of control operation can indicate the control operation is not to be prefetched. The control operation is placed in the block of code a point at which state may be recovered, generally at the end of the block of code.

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