| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| #include <linux/stringify.h> |
| #include <linux/linkage.h> |
| #include <asm/dwarf2.h> |
| #include <asm/cpufeatures.h> |
| #include <asm/alternative-asm.h> |
| #include <asm/export.h> |
| #include <asm/nospec-branch.h> |
| |
| .macro THUNK reg |
| .section .text.__x86.indirect_thunk |
| |
| ENTRY(__x86_indirect_thunk_\reg) |
| CFI_STARTPROC |
| JMP_NOSPEC %\reg |
| CFI_ENDPROC |
| ENDPROC(__x86_indirect_thunk_\reg) |
| .endm |
| |
| /* |
| * Despite being an assembler file we can't just use .irp here |
| * because __KSYM_DEPS__ only uses the C preprocessor and would |
| * only see one instance of "__x86_indirect_thunk_\reg" rather |
| * than one per register with the correct names. So we do it |
| * the simple and nasty way... |
| */ |
| #define __EXPORT_THUNK(sym) _ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym) |
| #define EXPORT_THUNK(reg) __EXPORT_THUNK(__x86_indirect_thunk_ ## reg) |
| #define GENERATE_THUNK(reg) THUNK reg ; EXPORT_THUNK(reg) |
| |
| GENERATE_THUNK(_ASM_AX) |
| GENERATE_THUNK(_ASM_BX) |
| GENERATE_THUNK(_ASM_CX) |
| GENERATE_THUNK(_ASM_DX) |
| GENERATE_THUNK(_ASM_SI) |
| GENERATE_THUNK(_ASM_DI) |
| GENERATE_THUNK(_ASM_BP) |
| #ifdef CONFIG_64BIT |
| GENERATE_THUNK(r8) |
| GENERATE_THUNK(r9) |
| GENERATE_THUNK(r10) |
| GENERATE_THUNK(r11) |
| GENERATE_THUNK(r12) |
| GENERATE_THUNK(r13) |
| GENERATE_THUNK(r14) |
| GENERATE_THUNK(r15) |
| #endif |