2 * jump label x86 support
4 * Copyright (C) 2009 Jason Baron <jbaron@redhat.com>
7 #include <linux/jump_label.h>
8 #include <linux/memory.h>
9 #include <linux/uaccess.h>
10 #include <linux/module.h>
11 #include <linux/list.h>
12 #include <linux/jhash.h>
13 #include <linux/cpu.h>
14 #include <asm/kprobes.h>
15 #include <asm/alternative.h>
17 #ifdef HAVE_JUMP_LABEL
19 union jump_code_union {
20 char code[JUMP_LABEL_NOP_SIZE];
24 } __attribute__((packed));
27 void arch_jump_label_transform(struct jump_entry *entry,
28 enum jump_label_type type)
30 union jump_code_union code;
32 if (type == JUMP_LABEL_ENABLE) {
34 code.offset = entry->target -
35 (entry->code + JUMP_LABEL_NOP_SIZE);
37 memcpy(&code, ideal_nop5, JUMP_LABEL_NOP_SIZE);
39 mutex_lock(&text_mutex);
40 text_poke_smp((void *)entry->code, &code, JUMP_LABEL_NOP_SIZE);
41 mutex_unlock(&text_mutex);
45 void arch_jump_label_text_poke_early(jump_label_t addr)
47 text_poke_early((void *)addr, ideal_nop5, JUMP_LABEL_NOP_SIZE);