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selftests/sgx: Remove incomplete ABI sanitization code in test enclave
As the selftest enclave is *not* intended for production, simplify the code by not initializing CPU configuration registers as expected by the ABI on enclave entry or cleansing caller-save registers on enclave exit. Signed-off-by: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Link: https://lore.kernel.org/all/da0cfb1e-e347-f7f2-ac72-aec0ee0d867d@intel.com/ Link: https://lore.kernel.org/all/20231005153854.25566-14-jo.vanbulck%40cs.kuleuven.be
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@ -59,21 +59,11 @@ encl_entry_core:
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push %rcx # push the address after EENTER
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# NOTE: as the selftest enclave is *not* intended for production,
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# simplify the code by not initializing ABI registers on entry or
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# cleansing caller-save registers on exit.
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call encl_body
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/* Clear volatile GPRs, except RAX (EEXIT function). */
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xor %rcx, %rcx
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xor %rdx, %rdx
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xor %rdi, %rdi
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xor %rsi, %rsi
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xor %r8, %r8
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xor %r9, %r9
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xor %r10, %r10
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xor %r11, %r11
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# Reset status flags.
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add %rdx, %rdx # OF = SF = AF = CF = 0; ZF = PF = 1
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# Prepare EEXIT target by popping the address of the instruction after
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# EENTER to RBX.
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pop %rbx
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