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[Pal/Linux-SGX] Clear RFLAGS.DF on enclave entry

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SYSV x86-64 ABI requires RFLAGS.DF to be cleared when entering a function (other flags are
undefined) and we can't trust non-SGX side to do this.
This commit is contained in:
Isaku Yamahata
2019-05-01 13:19:31 +02:00
committed by Michał Kowalczyk
parent 917356119c
commit 2de42097fe
1 changed files with 3 additions and 0 deletions
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Pal/src/host/Linux-SGX/enclave_entry.S
+3
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@@ -17,6 +17,9 @@ enclave_entry:
# On EENTER/ERESUME, RAX is the current SSA, RBX is the address of TCS,
# RCX is the address of AEP. Other registers are not trusted.
# x86-64 sysv abi requires %rFLAGS.DF = 0 on entry to function call.
cld
# current SSA is in RAX (Trusted)
cmpq $0, %rax
jne .Lhandle_resume