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76b04384 DW |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | ||
3 | #include <linux/stringify.h> | |
4 | #include <linux/linkage.h> | |
5 | #include <asm/dwarf2.h> | |
6 | #include <asm/cpufeatures.h> | |
7 | #include <asm/alternative-asm.h> | |
8 | #include <asm/export.h> | |
9 | #include <asm/nospec-branch.h> | |
10 | ||
11 | .macro THUNK reg | |
736e80a4 | 12 | .section .text.__x86.indirect_thunk |
76b04384 DW |
13 | |
14 | ENTRY(__x86_indirect_thunk_\reg) | |
15 | CFI_STARTPROC | |
16 | JMP_NOSPEC %\reg | |
17 | CFI_ENDPROC | |
18 | ENDPROC(__x86_indirect_thunk_\reg) | |
19 | .endm | |
20 | ||
21 | /* | |
22 | * Despite being an assembler file we can't just use .irp here | |
23 | * because __KSYM_DEPS__ only uses the C preprocessor and would | |
24 | * only see one instance of "__x86_indirect_thunk_\reg" rather | |
25 | * than one per register with the correct names. So we do it | |
26 | * the simple and nasty way... | |
27 | */ | |
c1804a23 MH |
28 | #define __EXPORT_THUNK(sym) _ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym) |
29 | #define EXPORT_THUNK(reg) __EXPORT_THUNK(__x86_indirect_thunk_ ## reg) | |
76b04384 DW |
30 | #define GENERATE_THUNK(reg) THUNK reg ; EXPORT_THUNK(reg) |
31 | ||
32 | GENERATE_THUNK(_ASM_AX) | |
33 | GENERATE_THUNK(_ASM_BX) | |
34 | GENERATE_THUNK(_ASM_CX) | |
35 | GENERATE_THUNK(_ASM_DX) | |
36 | GENERATE_THUNK(_ASM_SI) | |
37 | GENERATE_THUNK(_ASM_DI) | |
38 | GENERATE_THUNK(_ASM_BP) | |
76b04384 DW |
39 | #ifdef CONFIG_64BIT |
40 | GENERATE_THUNK(r8) | |
41 | GENERATE_THUNK(r9) | |
42 | GENERATE_THUNK(r10) | |
43 | GENERATE_THUNK(r11) | |
44 | GENERATE_THUNK(r12) | |
45 | GENERATE_THUNK(r13) | |
46 | GENERATE_THUNK(r14) | |
47 | GENERATE_THUNK(r15) | |
48 | #endif |