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[Pal/Linux-SGX] Fix stack alignment for _DkExceptionHandler() and OCALLs

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This commit is contained in:
Isaku Yamahata
2019-05-21 18:57:37 -07:00
committed by Dmitrii Kuvaiskii
parent e3a04c29a6
commit 16d829cae4
1 changed files with 5 additions and 2 deletions
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Pal/src/host/Linux-SGX/enclave_entry.S
+5 -2
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@@ -226,8 +226,12 @@ enclave_entry:
# Pass pointer to sgx_context_t to _DkExceptionHandler
movq %rsi, SGX_GPR_RSI(%rbx)
# Align the stack for _DkExceptionHandler
# x86-64 sysv abi requires 16B alignment of stack before call instruction
# which implies a (8 mod 16)B alignment on function entry (due to implicit
# push %rip).
# Align the stack for _DkExceptionHandler according to this requirement.
andq $STACK_ALIGN, %rsi
subq $8, %rsi
movq %rsi, SGX_GPR_RSP(%rbx)
# clear rflags to conform the ABI which requires RFLAGS.DF = 0
@@ -396,7 +400,6 @@ sgx_ocall:
# mode in-enclave memory can't be accessed.
movq %gs:SGX_USTACK, %rsp
andq $STACK_ALIGN, %rsp
#ifdef DEBUG
# Push %rip of some code inside __morestack() on untrusted stack.