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2ab9c93d61
When building with clang, via:
make LLVM=1 -C tools/testing/selftests
...the build fails because clang's inline asm doesn't support all of the
features that are used in the asm() snippet in sysret_rip.c.
Fix this by moving the asm code into the clang_helpers_64.S file, where
it can be built with the assembler's full set of features.
Acked-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
28 lines
564 B
ArmAsm
28 lines
564 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* 64-bit assembly helpers for asm operations that lack support in both gcc and
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* clang. For example, clang asm does not support segment prefixes.
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*/
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.global dereference_seg_base
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dereference_seg_base:
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mov %gs:(0), %rax
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ret
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.global test_page
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.global test_syscall_insn
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.pushsection ".text", "ax"
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.balign 4096
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test_page: .globl test_page
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.fill 4094,1,0xcc
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test_syscall_insn:
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syscall
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.ifne . - test_page - 4096
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.error "test page is not one page long"
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.endif
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.popsection
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.section .note.GNU-stack,"",%progbits
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