Restricted instructions in transactional execution
First Claim
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1. A computer-implemented method of performing processing associated with transactional execution in a computing environment, the computer-implemented method comprising:
- obtaining, by a processor, an instruction to be executed as part of a transaction;
computing one or more effective controls from one or more controls set by one or more transaction begin instructions, wherein the one or more effective controls comprises an effective allow access register modification control that indicates whether an access register is permitted to be modified, wherein the access register specifies an indirect specification of an address space control element;
determining by the processor whether the instruction is a selectively restricted instruction that is prohibited from execution within the transaction, the determining being based on the computed one or more effective controls; and
performing processing associated with the instruction based on whether the instruction is selectively restricted.
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Abstract
Restricted instructions are prohibited from execution within a transaction. There are classes of instructions that are restricted regardless of type of transaction: constrained or nonconstrained. There are instructions only restricted in constrained transactions, and there are instructions that are selectively restricted for given transactions based on controls specified on instructions used to initiate the transactions.
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Citations
20 Claims
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1. A computer-implemented method of performing processing associated with transactional execution in a computing environment, the computer-implemented method comprising:
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obtaining, by a processor, an instruction to be executed as part of a transaction; computing one or more effective controls from one or more controls set by one or more transaction begin instructions, wherein the one or more effective controls comprises an effective allow access register modification control that indicates whether an access register is permitted to be modified, wherein the access register specifies an indirect specification of an address space control element; determining by the processor whether the instruction is a selectively restricted instruction that is prohibited from execution within the transaction, the determining being based on the computed one or more effective controls; and performing processing associated with the instruction based on whether the instruction is selectively restricted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer-implemented method of performing processing associated with transactional execution in a computing environment, the computer-implemented method comprising:
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obtaining, by a processor, an instruction to be executed as part of a transaction; computing one or more effective controls from one or more controls set by one or more transaction begin instructions, wherein the one or more effective controls comprises an effective allow floating point operation control that indicates whether specified floating point instructions are permitted to be executed; determining by the processor whether the instruction is a selectively restricted instruction that is prohibited from execution within the transaction, the determining being based on the one or more effective controls computed from one or more controls set by one or more transaction begin instructions; and performing processing associated with the instruction based on whether the instruction is selectively restricted. - View Dependent Claims (12, 13, 14, 15)
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16. A computer program product for performing processing associated with transactional execution in a computing environment, the computer program product comprising:
a non-transitory computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising; obtaining, by a processor, an instruction to be executed as part of a transaction; computing one or more effective controls from one or more controls set by one or more transaction begin instructions, wherein the one or more effective controls comprises an effective allow floating point operation control that indicates whether specified floating point instructions are permitted to be executed; determining by the processor whether the instruction is a selectively restricted instruction that is prohibited from execution within the transaction, the determining being based on the one or more effective controls computed from one or more controls set by one or more transaction begin instructions; and performing processing associated with the instruction based on whether the instruction is selectively restricted. - View Dependent Claims (17, 18, 19, 20)
Specification