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35de5b0692
alternative.h pulls in ptrace.h, which means that alternatives can't be used in anything referenced from ptrace.h, which is a mess. Break the dependency by pulling text patching helpers into their own header. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/99b93b13f2c9eb671f5c98bba4c2cbdc061293a2.1461698311.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
#ifndef _ASM_X86_TEXT_PATCHING_H
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#define _ASM_X86_TEXT_PATCHING_H
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <asm/ptrace.h>
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struct paravirt_patch_site;
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#ifdef CONFIG_PARAVIRT
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void apply_paravirt(struct paravirt_patch_site *start,
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struct paravirt_patch_site *end);
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#else
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static inline void apply_paravirt(struct paravirt_patch_site *start,
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struct paravirt_patch_site *end)
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{}
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#define __parainstructions NULL
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#define __parainstructions_end NULL
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#endif
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extern void *text_poke_early(void *addr, const void *opcode, size_t len);
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/*
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* Clear and restore the kernel write-protection flag on the local CPU.
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* Allows the kernel to edit read-only pages.
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* Side-effect: any interrupt handler running between save and restore will have
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* the ability to write to read-only pages.
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*
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* Warning:
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* Code patching in the UP case is safe if NMIs and MCE handlers are stopped and
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* no thread can be preempted in the instructions being modified (no iret to an
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* invalid instruction possible) or if the instructions are changed from a
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* consistent state to another consistent state atomically.
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* On the local CPU you need to be protected again NMI or MCE handlers seeing an
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* inconsistent instruction while you patch.
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*/
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extern void *text_poke(void *addr, const void *opcode, size_t len);
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extern int poke_int3_handler(struct pt_regs *regs);
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extern void *text_poke_bp(void *addr, const void *opcode, size_t len, void *handler);
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#endif /* _ASM_X86_TEXT_PATCHING_H */
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