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- #ifndef _ASM_X86_TEXT_PATCHING_H
- #define _ASM_X86_TEXT_PATCHING_H
- #include <linux/types.h>
- #include <linux/stddef.h>
- #include <asm/ptrace.h>
- struct paravirt_patch_site;
- #ifdef CONFIG_PARAVIRT
- void apply_paravirt(struct paravirt_patch_site *start,
- struct paravirt_patch_site *end);
- #else
- static inline void apply_paravirt(struct paravirt_patch_site *start,
- struct paravirt_patch_site *end)
- {}
- #define __parainstructions NULL
- #define __parainstructions_end NULL
- #endif
- extern void *text_poke_early(void *addr, const void *opcode, size_t len);
- /*
- * Clear and restore the kernel write-protection flag on the local CPU.
- * Allows the kernel to edit read-only pages.
- * Side-effect: any interrupt handler running between save and restore will have
- * the ability to write to read-only pages.
- *
- * Warning:
- * Code patching in the UP case is safe if NMIs and MCE handlers are stopped and
- * no thread can be preempted in the instructions being modified (no iret to an
- * invalid instruction possible) or if the instructions are changed from a
- * consistent state to another consistent state atomically.
- * On the local CPU you need to be protected again NMI or MCE handlers seeing an
- * inconsistent instruction while you patch.
- */
- extern void *text_poke(void *addr, const void *opcode, size_t len);
- extern int poke_int3_handler(struct pt_regs *regs);
- extern void *text_poke_bp(void *addr, const void *opcode, size_t len, void *handler);
- #endif /* _ASM_X86_TEXT_PATCHING_H */
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