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45be2ad007
Recently, ld.lld moved from '--undefined-version' to
'--no-undefined-version' as the default, which breaks building the vDSO
when CONFIG_X86_SGX is not set:
ld.lld: error: version script assignment of 'LINUX_2.6' to symbol '__vdso_sgx_enter_enclave' failed: symbol not defined
__vdso_sgx_enter_enclave is only included in the vDSO when
CONFIG_X86_SGX is set. Only export it if it will be present in the final
object, which clears up the error.
Fixes: 8466436952 ("x86/vdso: Implement a vDSO for Intel SGX enclave call")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1756
Link: https://lore.kernel.org/r/20221109000306.1407357-1-nathan@kernel.org
36 lines
624 B
ArmAsm
36 lines
624 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Linker script for 64-bit vDSO.
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* We #include the file to define the layout details.
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*
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* This file defines the version script giving the user-exported symbols in
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* the DSO.
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*/
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#define BUILD_VDSO64
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#include "vdso-layout.lds.S"
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/*
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* This controls what userland symbols we export from the vDSO.
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*/
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VERSION {
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LINUX_2.6 {
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global:
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clock_gettime;
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__vdso_clock_gettime;
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gettimeofday;
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__vdso_gettimeofday;
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getcpu;
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__vdso_getcpu;
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time;
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__vdso_time;
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clock_getres;
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__vdso_clock_getres;
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#ifdef CONFIG_X86_SGX
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__vdso_sgx_enter_enclave;
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#endif
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local: *;
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};
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}
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