41-8 Vol. 3D

SGX INSTRUCTION REFERENCES

THEN #GP(0); FI;

IF CR_ENCLAVE_MODE = 1 and (EAX = 2 or EAX = 3) (* EENTER or ERESUME *)

THEN #GP(0); FI;

IF CR_ENCLAVE_MODE = 0 and (EAX = 0 or EAX = 1 or EAX = 4 or EAX = 5 or EAX = 6 or EAX = 7)
(* EREPORT, EGETKEY, EEXIT, EACCEPT, EMODPE, or EACCEPTCOPY *)

THEN #GP(0); FI;

Jump to leaf specific flow

Flags Affected

See individual leaf functions

Protected Mode Exceptions

#UD

If any of the LOCK/OSIZE/REP/VEX prefix is used.
If current privilege level is not 3.
If CPUID.(EAX=12H,ECX=0):EAX.SGX1 [bit 0] = 0.
If logical processor is in SMM.

#GP(0)

If IA32_FEATURE_CONTROL.LOCK = 0.
If IA32_FEATURE_CONTROL.SGX_ENABLE = 0.
If input value in EAX encodes an unsupported leaf.
If input value in EAX encodes EENTER/ERESUME and ENCLAVE_MODE = 1.
If input value in EAX encodes EGETKEY/EREPORT/EEXIT/EACCEPT/EACCEPTCOPY/EMODPE 

and ENCLAVE_MODE = 0.

If operating in 16-bit mode.
If data segment is in 16-bit mode.
If CR0.PG = 0 or CR0.NE= 0.

#NM

If CR0.TS = 1.

Real-Address Mode Exceptions

#UD

ENCLS is not recognized in real mode.

Virtual-8086 Mode Exceptions

#UD

ENCLS is not recognized in virtual-8086 mode.

Compatibility Mode Exceptions

Same exceptions as in protected mode.

64-Bit Mode Exceptions

#UD

If any of the LOCK/OSIZE/REP/VEX prefix is used.
If current privilege level is not 3.
If CPUID.(EAX=12H,ECX=0):EAX.SGX1 [bit 0] = 0.
If logical processor is in SMM.

#GP(0)

If IA32_FEATURE_CONTROL.LOCK = 0.
If IA32_FEATURE_CONTROL.SGX_ENABLE = 0.
If input value in EAX encodes an unsupported leaf.
If input value in EAX encodes EENTER/ERESUME and ENCLAVE_MODE = 1.
If input value in EAX encodes EGETKEY/EREPORT/EEXIT/EACCEPT/EACCEPTCOPY/EMODPE 

and ENCLAVE_MODE = 0.