From: Jarkko Sakkinen <jarkko@kernel.org>
To: Shuah Khan <skhan@linuxfoundation.org>
Cc: Jarkko Sakkinen <jarkko@kernel.org>,
Reinette Chatre <reinette.chatre@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Shuah Khan <shuah@kernel.org>,
linux-sgx@vger.kernel.org (open list:INTEL SGX),
linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST
FRAMEWORK), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v2 1/2] selftests/sgx: Use rip relative addressing for encl_stack
Date: Tue, 22 Mar 2022 09:43:11 +0200 [thread overview]
Message-ID: <20220322074313.7444-1-jarkko@kernel.org> (raw)
Simplify the test_encl_bootstrap.S flow by using rip-relative addressing.
Compiler does the right thing here, and this removes dependency on where
TCS entries need to be located in the binary, i.e. allows the binary layout
changed freely in the future.
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
tools/testing/selftests/sgx/test_encl_bootstrap.S | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/tools/testing/selftests/sgx/test_encl_bootstrap.S b/tools/testing/selftests/sgx/test_encl_bootstrap.S
index 82fb0dfcbd23..1c1b5c6c4ffe 100644
--- a/tools/testing/selftests/sgx/test_encl_bootstrap.S
+++ b/tools/testing/selftests/sgx/test_encl_bootstrap.S
@@ -40,11 +40,7 @@
.text
encl_entry:
- # RBX contains the base address for TCS, which is the first address
- # inside the enclave for TCS #1 and one page into the enclave for
- # TCS #2. By adding the value of encl_stack to it, we get
- # the absolute address for the stack.
- lea (encl_stack)(%rbx), %rax
+ lea (encl_stack)(%rip), %rax
xchg %rsp, %rax
push %rax
--
2.35.1
next reply other threads:[~2022-03-22 7:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-22 7:43 Jarkko Sakkinen [this message]
2022-03-22 7:43 ` [PATCH v2 2/2] selftests/sgx: Make TCS table relocatable Jarkko Sakkinen
2022-03-28 21:49 ` [PATCH v2 1/2] selftests/sgx: Use rip relative addressing for encl_stack Reinette Chatre
2022-03-30 14:54 ` Jarkko Sakkinen
2022-03-30 14:56 ` Jarkko Sakkinen
2022-03-30 17:40 ` Reinette Chatre
[not found] ` <f68d472877b7136c32d8770603a3de38de59c322.camel@kernel.org>
2022-03-30 19:22 ` Jarkko Sakkinen
2022-03-30 20:05 ` Reinette Chatre
2022-03-30 20:40 ` Jarkko Sakkinen
2022-03-30 21:29 ` Reinette Chatre
2022-03-30 22:30 ` Jarkko Sakkinen
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