diff options
Diffstat (limited to 'tools/testing/selftests/x86/clang_helpers_64.S')
| -rw-r--r-- | tools/testing/selftests/x86/clang_helpers_64.S | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tools/testing/selftests/x86/clang_helpers_64.S b/tools/testing/selftests/x86/clang_helpers_64.S new file mode 100644 index 000000000000..185a69dbf39c --- /dev/null +++ b/tools/testing/selftests/x86/clang_helpers_64.S @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * 64-bit assembly helpers for asm operations that lack support in both gcc and + * clang. For example, clang asm does not support segment prefixes. + */ +.global dereference_seg_base + +dereference_seg_base: + mov %gs:(0), %rax + ret + +.global test_page +.global test_syscall_insn + +.pushsection ".text", "ax" +.balign 4096 +test_page: .globl test_page + .fill 4094,1,0xcc + +test_syscall_insn: + syscall + +.ifne . - test_page - 4096 + .error "test page is not one page long" +.endif +.popsection + +.section .note.GNU-stack,"",%progbits |