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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
35de5b06 AL |
2 | #ifndef _ASM_X86_TEXT_PATCHING_H |
3 | #define _ASM_X86_TEXT_PATCHING_H | |
4 | ||
5 | #include <linux/types.h> | |
6 | #include <linux/stddef.h> | |
7 | #include <asm/ptrace.h> | |
8 | ||
9 | struct paravirt_patch_site; | |
10 | #ifdef CONFIG_PARAVIRT | |
11 | void apply_paravirt(struct paravirt_patch_site *start, | |
12 | struct paravirt_patch_site *end); | |
13 | #else | |
14 | static inline void apply_paravirt(struct paravirt_patch_site *start, | |
15 | struct paravirt_patch_site *end) | |
16 | {} | |
17 | #define __parainstructions NULL | |
18 | #define __parainstructions_end NULL | |
19 | #endif | |
20 | ||
21 | extern void *text_poke_early(void *addr, const void *opcode, size_t len); | |
22 | ||
23 | /* | |
24 | * Clear and restore the kernel write-protection flag on the local CPU. | |
25 | * Allows the kernel to edit read-only pages. | |
26 | * Side-effect: any interrupt handler running between save and restore will have | |
27 | * the ability to write to read-only pages. | |
28 | * | |
29 | * Warning: | |
30 | * Code patching in the UP case is safe if NMIs and MCE handlers are stopped and | |
31 | * no thread can be preempted in the instructions being modified (no iret to an | |
32 | * invalid instruction possible) or if the instructions are changed from a | |
33 | * consistent state to another consistent state atomically. | |
34 | * On the local CPU you need to be protected again NMI or MCE handlers seeing an | |
35 | * inconsistent instruction while you patch. | |
36 | */ | |
37 | extern void *text_poke(void *addr, const void *opcode, size_t len); | |
38 | extern int poke_int3_handler(struct pt_regs *regs); | |
39 | extern void *text_poke_bp(void *addr, const void *opcode, size_t len, void *handler); | |
40 | ||
41 | #endif /* _ASM_X86_TEXT_PATCHING_H */ |