1/*
 2 * jump label x86 support
 3 *
 4 * Copyright (C) 2009 Jason Baron <jbaron@redhat.com>
 5 *
 6 */
 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>
16
17#ifdef HAVE_JUMP_LABEL
18
19union jump_code_union {
20	char code[JUMP_LABEL_NOP_SIZE];
21	struct {
22		char jump;
23		int offset;
24	} __attribute__((packed));
25};
26
27static void __jump_label_transform(struct jump_entry *entry,
28				   enum jump_label_type type,
29				   void *(*poker)(void *, const void *, size_t))
30{
31	union jump_code_union code;
32
33	if (type == JUMP_LABEL_ENABLE) {
34		code.jump = 0xe9;
35		code.offset = entry->target -
36				(entry->code + JUMP_LABEL_NOP_SIZE);
37	} else
38		memcpy(&code, ideal_nops[NOP_ATOMIC5], JUMP_LABEL_NOP_SIZE);
39
40	(*poker)((void *)entry->code, &code, JUMP_LABEL_NOP_SIZE);
41}
42
43void arch_jump_label_transform(struct jump_entry *entry,
44			       enum jump_label_type type)
45{
46	get_online_cpus();
47	mutex_lock(&text_mutex);
48	__jump_label_transform(entry, type, text_poke_smp);
49	mutex_unlock(&text_mutex);
50	put_online_cpus();
51}
52
53__init_or_module void arch_jump_label_transform_static(struct jump_entry *entry,
54				      enum jump_label_type type)
55{
56	__jump_label_transform(entry, type, text_poke_early);
 
57}
58
59#endif

 1/*
 2 * jump label x86 support
 3 *
 4 * Copyright (C) 2009 Jason Baron <jbaron@redhat.com>
 5 *
 6 */
 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>
16
17#ifdef HAVE_JUMP_LABEL
18
19union jump_code_union {
20	char code[JUMP_LABEL_NOP_SIZE];
21	struct {
22		char jump;
23		int offset;
24	} __attribute__((packed));
25};
26
27void arch_jump_label_transform(struct jump_entry *entry,
28			       enum jump_label_type type)
 
29{
30	union jump_code_union code;
31
32	if (type == JUMP_LABEL_ENABLE) {
33		code.jump = 0xe9;
34		code.offset = entry->target -
35				(entry->code + JUMP_LABEL_NOP_SIZE);
36	} else
37		memcpy(&code, ideal_nops[NOP_ATOMIC5], JUMP_LABEL_NOP_SIZE);
 
 
 
 
 
 
 
38	get_online_cpus();
39	mutex_lock(&text_mutex);
40	text_poke_smp((void *)entry->code, &code, JUMP_LABEL_NOP_SIZE);
41	mutex_unlock(&text_mutex);
42	put_online_cpus();
43}
44
45void arch_jump_label_text_poke_early(jump_label_t addr)
 
46{
47	text_poke_early((void *)addr, ideal_nops[NOP_ATOMIC5],
48			JUMP_LABEL_NOP_SIZE);
49}
50
51#endif