diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-09-11 04:34:46 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-09-11 04:34:46 -0300 |
commit | 863981e96738983919de841ec669e157e6bdaeb0 (patch) | |
tree | d6d89a12e7eb8017837c057935a2271290907f76 /arch/x86/include/asm/text-patching.h | |
parent | 8dec7c70575785729a6a9e6719a955e9c545bcab (diff) |
Linux-libre 4.7.1-gnupck-4.7.1-gnu
Diffstat (limited to 'arch/x86/include/asm/text-patching.h')
-rw-r--r-- | arch/x86/include/asm/text-patching.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/x86/include/asm/text-patching.h b/arch/x86/include/asm/text-patching.h new file mode 100644 index 000000000..903950633 --- /dev/null +++ b/arch/x86/include/asm/text-patching.h @@ -0,0 +1,40 @@ +#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 */ |