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ST20-GP6 数据表(PDF) 29 Page - STMicroelectronics |
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ST20-GP6 数据表(HTML) 29 Page - STMicroelectronics |
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29 / 123 page  ST20-GP6 29/123 4.6.5 Restrictions on trap handlers There are various restrictions that must be placed on trap handlers to ensure that they work cor- rectly. 1 Trap handlers must not deschedule or timeslice. Trap handlers alter the Enables masks, therefore they must not allow other processes to execute until they have completed. 2 Trap handlers must have their Enable masks set to mask all traps in their trap group to avoid the possibility of a trap handler trapping to itself. 3 Trap handlers must terminate via the tret (trap return) instruction. The only exception to this is that a scheduler kernel may use restart to return to a previously shadowed process. |
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