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