| /* 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 |
