Convert pointer to capability offset from a capability, with null capability from zero semantics derives the Capability Value from the source 64-bit register and Capability register, and writes the result to the destination Capability register. This instruction sets the destination Capability register to zero based on the result.
| 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 |
| 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | Rm | 0 | 1 | 0 | 1 | 1 | 0 | Cn | Cd | ||||||||||||
integer d = UInt(Cd); integer n = UInt(Cn); integer m = UInt(Rm);
| <Cd> |
Is the capability name of the destination register, encoded in the "Cd" field. |
| <Cn|CSP> |
Is the capability name of the source register or stack pointer, encoded in the "Cn" field. |
| <Xm> |
Is the 64-bit name of the source general-purpose register, encoded in the "Rm" field. |
CheckCapabilitiesEnabled(); Capability operand1 = if n == 31 then CSP[] else C[n]; bits(64) operand2 = X[m]; Capability result; if operand2 == 0 then result = CapNull(); else if CCTLR[].DDCBO == '1' then result = CapSetOffset(operand1,operand2); else result = CapSetValue(operand1,operand2); if CapIsSealed(operand1) then C[d] = CapWithTagClear(result); else C[d] = result;
Internal version only: isa v32.13, AdvSIMD v29.04, pseudocode morello-2022-01_rc2, capabilities morello-2022-01_rc2 ; Build timestamp: 2022-01-11T11:23
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