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selftests/sgx: Remove incomplete ABI sanitization code in test enclave

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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
This commit is contained in:
Jo Van Bulck 2023-10-05 17:38:54 +02:00 committed by Dave Hansen
parent ec44ca1e34
commit 886c5be0b1
1 changed files with 3 additions and 13 deletions
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16
tools/testing/selftests/sgx/test_encl_bootstrap.S
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@ -59,21 +59,11 @@ encl_entry_core:
push %rcx # push the address after EENTER
# NOTE: as the selftest enclave is *not* intended for production,
# simplify the code by not initializing ABI registers on entry or
# cleansing caller-save registers on exit.
call encl_body
/* Clear volatile GPRs, except RAX (EEXIT function). */
xor %rcx, %rcx
xor %rdx, %rdx
xor %rdi, %rdi
xor %rsi, %rsi
xor %r8, %r8
xor %r9, %r9
xor %r10, %r10
xor %r11, %r11
# Reset status flags.
add %rdx, %rdx # OF = SF = AF = CF = 0; ZF = PF = 1
# Prepare EEXIT target by popping the address of the instruction after
# EENTER to RBX.
pop %rbx