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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.
The SP_EL3 bit assignments are:
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 |
Stack pointer | |||||||||||||||||||||||||||||||
Stack pointer | |||||||||||||||||||||||||||||||
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.
On a Warm reset, thisThis field resets to an architecturally UNKNOWN value.
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.
3001/0907/2020 15:0757; ccead0cb9f089f9ceec50268e82aec9e7104721180324f0b9997bede489cc15ad1565345720bcd2a
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