Clear capability permissions (immediate) clears the Capability Permissions of the source capability based on an immediate value and writes the result to the destination Capability register.
| 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 | 0 | 0 | 0 | 1 | 1 | 0 | perm | 1 | 0 | 0 | Cn | Cd | ||||||||||
integer n = UInt(Cn); integer d = UInt(Cd); bits(3) imm = perm;
| <Cd|CSP> |
Is the capability name of the destination register or stack pointer, encoded in the "Cd" field. |
| <Cn|CSP> |
Is the capability name of the source register or stack pointer, encoded in the "Cn" field. |
| <perm> |
Is the perm specifier,
encoded in
perm:
|
CheckCapabilitiesEnabled(); Capability data = if n == 31 then CSP[] else C[n]; Capability result; bits(64) clr_perms = Zeros(64); if imm<0> == '1' then clr_perms = clr_perms OR CAP_PERM_EXECUTE; if imm<1> == '1' then clr_perms = clr_perms OR CAP_PERM_STORE; if imm<2> == '1' then clr_perms = clr_perms OR CAP_PERM_LOAD; result = CapClearPerms(data, clr_perms); if CapIsSealed(data) then result = CapWithTagClear(result); if d == 31 then CSP[] = 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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