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Secure Monitor Call causes an exception to EL3.
SMC is available only for software executing at EL1 or higher. It is undefined in EL0.
If the values of HCR_EL2.TSC and SCR_EL3.SMD are both 0, execution of an SMC instruction at EL1 or higher generates a Secure Monitor Call exception, recording it in ESR_ELx, using the EC value 0x17, that is taken to EL3.
If the value of HCR_EL2.TSC is 1 and EL2 is enabled in the current Security state, execution of an SMC instruction at EL1 generates an exception that is taken to EL2, regardless of the value of SCR_EL3.SMD. For more information, see Traps to EL2 of Non-secure EL1 execution of SMC instructions.
If the value of HCR_EL2.TSC is 0 and the value of SCR_EL3.SMD is 1, the SMC instruction is undefined.
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 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | imm16 | 0 | 0 | 0 | 1 | 1 |
SMC #<imm>
// Empty.bits(16) imm = imm16;
AArch64.CheckForSMCUndefOrTrap(imm16);
(imm);
if SCR_EL3.SMD == '1' then
// SMC disabled
UNDEFINED;
else
AArch64.CallSecureMonitor(imm16);(imm);
Internal version only: isa v31.05b, AdvSIMD v29.02, pseudocode v2019-12_rc3_1, sve v2019-12_rc3
; Build timestamp: 2019-12-13T11:3502
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This document is Confidential.Non-Confidential.
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