1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * 64-bit assembly helpers for asm operations that lack support in both gcc and 4 * clang. For example, clang asm does not support segment prefixes. 5 */ 6.global dereference_seg_base 7 8dereference_seg_base: 9 mov %gs:(0), %rax 10 ret 11 12.global test_page 13.global test_syscall_insn 14 15.pushsection ".text", "ax" 16.balign 4096 17test_page: .globl test_page 18 .fill 4094,1,0xcc 19 20test_syscall_insn: 21 syscall 22 23.ifne . - test_page - 4096 24 .error "test page is not one page long" 25.endif 26.popsection 27 28.section .note.GNU-stack,"",%progbits 29