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 8struct paravirt_patch_site; 9#ifdef CONFIG_PARAVIRT 10void apply_paravirt(struct paravirt_patch_site *start, 11 struct paravirt_patch_site *end); 12#else 13static 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 20extern 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 */ 36extern void *text_poke(void *addr, const void *opcode, size_t len); 37extern int poke_int3_handler(struct pt_regs *regs); 38extern void *text_poke_bp(void *addr, const void *opcode, size_t len, void *handler); 39 40#endif /* _ASM_X86_TEXT_PATCHING_H */ 41