Memory access instructions with additional protection flag enforcement

A system comprising:

• a memory;
• and
• a processor operatively coupled to the memory, to execute a compiler to:
• receive source code to be compiled;
• generate, in view of the source code, an augmented load instruction comprising a first operand specifying a source memory location, a second operand specifying a destination memory location, and a third operand specifying a validation permission value to be compared to a permission value associated with a page table entry for the source memory location.

A non-transitory computer readable storage medium, having instructions stored therein, which when executed by a processing device of a computer system, cause the processing device to:

• receive, by a central processing unit (CPU), an executable program instruction;
• determine that the executable program instruction is an augmented load instruction, wherein the augmented load instruction specifies a first permission value;
• access a protection key index specified by a page table entry associated with a memory address referenced by the augmented load instruction;
• retrieve, from a protection key register, an access permission value mapped to the protection key index;
• determine whether the first permission value specified by the augmented load instruction matches the access permission value;
• and
• responsive to determining that the first permission value matches the access permission value, load, into a register, contents of a memory location referenced by the memory address.