diff options
Diffstat (limited to 'src/libstd/sys')
| -rw-r--r-- | src/libstd/sys/sgx/abi/entry.S | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/libstd/sys/sgx/abi/entry.S b/src/libstd/sys/sgx/abi/entry.S index c35e49b1dc6..cd26c7ca200 100644 --- a/src/libstd/sys/sgx/abi/entry.S +++ b/src/libstd/sys/sgx/abi/entry.S @@ -119,8 +119,14 @@ sgx_entry: mov %rbx,%gs:tcsls_tcs_addr stmxcsr %gs:tcsls_user_mxcsr fnstcw %gs:tcsls_user_fcw + /* reset user state */ - cld /* x86-64 ABI requires DF to be unset at function entry/exit */ +/* - DF flag: x86-64 ABI requires DF to be unset at function entry/exit */ +/* - AC flag: AEX on misaligned memory accesses leaks side channel info */ + pushfq + andq $~0x40400, (%rsp) + popfq + /* check for debug buffer pointer */ testb $0xff,DEBUG(%rip) jz .Lskip_debug_init |