APPARATUS AND METHOD TO PREVENT SINGLE- AND ZERO-STEPPING OF TRUSTED EXECUTION ENVIRONMENTS
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United States of America
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Issued Date -
Jan 30, 2025
app pub date -
Sep 29, 2023
filing date -
Sep 29, 2023
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Abstract
In one embodiment, an apparatus comprises a cache to store a plurality of instructions and data associated with a trusted execution environment; instruction processing circuitry to execute the plurality of instructions and process the data, the plurality of instructions including one or more instructions with memory operands, wherein responsive to an interrupt or an exception, the instruction processing circuitry is to pause processing the plurality of instructions and execute a handler; and decode circuitry to partially decode a next instruction of the plurality of instructions to be processed following execution of the handler to determine if the next instruction indicates a memory access and, if so, to calculate at least one corresponding memory address, wherein the partial decode is performed in accordance with one or more constant time programming restrictions.
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