Vol. 3D 41-81
SGX INSTRUCTION REFERENCES
EEXIT—Exits an Enclave
Instruction Operand Encoding
Description
The ENCLU[EEXIT] instruction exits the currently executing enclave and branches to the location specified in RBX.
RCX receives the current AEP. If RBX is not within the CS (32-bit mode) or is not canonical (64-bit mode) a #GP(0)
results.
EEXIT Memory Parameter Semantics
If RBX specifies an address that is inside the enclave, the instruction will complete normally. The fetch of the next
instruction will occur in non-enclave mode, but will attempt to fetch from inside the enclave. This has the effect of
abort page semantics on the next destination.
If secrets are contained in any registers, it is responsibility of enclave software to clear those registers.
If XCR0 was modified on enclave entry, it is restored to the value it had at the time of the most recent EENTER or
ERESUME.
If the enclave is opt-out, RFLAGS.TF is loaded from the value previously saved on EENTER.
Code and data breakpoints are unsuppressed.
Performance monitoring counters are unsuppressed.
Concurrency Restrictions
Opcode/
Instruction
Op/En
64/32
bit Mode
Support
CPUID
Feature
Flag
Description
EAX = 04H
IR
V/V
SGX1
This leaf function is used to exit an enclave.
ENCLU[EEXIT]
Op/En
EAX
RBX
RCX
IR
EEXIT (In)
Target address outside the enclave (In)
Address of the current AEP (In)
Target Address
Non-Enclave read and execute access
Table 41-54. Concurrency Restrictions of EEXIT with Intel® SGX Instructions - 1of 2
Operation
EEXIT
EADD
EBLOCK
ECRE
ATE
EDBGRD/
WR
EENTER/
ERESUME
EEXTEND
EGETKEY
EINIT
ELDB/ELDU
EPA
Param Targ VA
SECS Targ SECS Targ SECS SECS
Targ SECS TCS SSA SECS Targ SECS Param SECS SECS Targ VA
SECS VA
EEXIT
TCS
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
SSA
U
Y
Y
Y
Y
Y
Y
U
Y
Y
U
Y
Y
Y
Y
Y
SECS
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Table 41-55. Concurrency Restrictions of EEXIT with Intel® SGX Instructions - 2 of 2
Operation
EREMOVE
EREPORT
ETRA
CK
EWB
EAUG
EMODPE
EMODPR
EMODT
EACCEPT
EACCEPTCOPY
Para
m
Targ SECS Param SECS SECS
SRC VA
SECS Targ SECS Targ SECI
NFO
Targ SECS Targ SECS Targ SECI
NFO
SECS Targ SRC SECI
NFO
EEXIT
TCS
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
SSA
Y
Y
Y
Y
Y
Y
Y
U
Y
Y
Y
U
Y
U
U
SECS Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y