The SP_EL3 characteristics are:
Holds the stack pointer associated with EL3. When executing at EL3, the value of SPSel.SP determines the current stack pointer:
| SPSel.SP | Current stack pointer |
|---|---|
| 0b0 | SP_EL0 |
| 0b1 | SP_EL3 |
This register is present only when EL3 is implemented. Otherwise, direct accesses to SP_EL3 are UNDEFINED.
SP_EL3 is a 64-bit register.
| 63 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 52 | 51 | 50 | 49 | 48 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 |
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Stack pointer | |||||||||||||||||||||||||||||||
| Stack pointer | |||||||||||||||||||||||||||||||
Stack pointer.
The reset behavior of this field is:
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.
04/07/2023 11:23; 1b994cb0b8c6d1ae5a9a15edbc8bd6ce3b5c7d68
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