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SP_EL3: Stack Pointer (EL3)

Purpose

Holds the stack pointer associated with EL3. The value of SPSel.SP determines the current stack pointer.

Configuration

This register is present only when EL3 is implemented and FEAT_AA64 is implemented. Otherwise, direct accesses to SP_EL3 are UNDEFINED.

Attributes

SP_EL3 is a 64-bit register.

Field descriptions

6362616059585756555453525150494847464544434241403938373635343332
313029282726252423222120191817161514131211109876543210
StackPointer
StackPointer

StackPointer, bits [63:0]

Stack pointer.

The reset behavior of this field is:

Accessing SP_EL3

This register is not accessible using MRS and MSR instructions.

When the value of SPSel.SP is 1, this register is accessible at EL3 as the current stack pointer.

Note

When the value of SPSel.SP is 0, SP_EL0 is used as the current stack pointer at all Exception levels.