1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
#include <linux/spinlock.h>
#include <linux/hardirq.h>
#include <linux/ftrace.h>
#include <linux/percpu.h>
#include <linux/init.h>
#include <linux/list.h>
#include <trace/syscall.h>
#include <asm/ftrace.h>
#ifdef CONFIG_DYNAMIC_FTRACE
static const u32 ftrace_nop = 0x01000000;
static u32 ftrace_call_replace(unsigned long ip, unsigned long addr)
{
static u32 call;
s32 off;
off = ((s32)addr - (s32)ip);
call = 0x40000000 | ((u32)off >> 2);
return call;
}
static int ftrace_modify_code(unsigned long ip, u32 old, u32 new)
{
u32 replaced;
int faulted;
__asm__ __volatile__(
"1: cas [%[ip]], %[old], %[new]\n"
" flush %[ip]\n"
" mov 0, %[faulted]\n"
"2:\n"
" .section .fixup,#alloc,#execinstr\n"
" .align 4\n"
"3: sethi %%hi(2b), %[faulted]\n"
" jmpl %[faulted] + %%lo(2b), %%g0\n"
" mov 1, %[faulted]\n"
" .previous\n"
" .section __ex_table,\"a\"\n"
" .align 4\n"
" .word 1b, 3b\n"
" .previous\n"
: "=r" (replaced), [faulted] "=r" (faulted)
: [new] "0" (new), [old] "r" (old), [ip] "r" (ip)
: "memory");
if (replaced != old && replaced != new)
faulted = 2;
return faulted;
}
int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsigned long addr)
{
unsigned long ip = rec->ip;
u32 old, new;
old = ftrace_call_replace(ip, addr);
new = ftrace_nop;
return ftrace_modify_code(ip, old, new);
}
int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
{
unsigned long ip = rec->ip;
u32 old, new;
old = ftrace_nop;
new = ftrace_call_replace(ip, addr);
return ftrace_modify_code(ip, old, new);
}
int ftrace_update_ftrace_func(ftrace_func_t func)
{
unsigned long ip = (unsigned long)(&ftrace_call);
u32 old, new;
old = *(u32 *) &ftrace_call;
new = ftrace_call_replace(ip, (unsigned long)func);
return ftrace_modify_code(ip, old, new);
}
int __init ftrace_dyn_arch_init(void *data)
{
unsigned long *p = data;
*p = 0;
return 0;
}
#endif
#ifdef CONFIG_FTRACE_SYSCALLS
extern unsigned int sys_call_table[];
unsigned long __init arch_syscall_addr(int nr)
{
return (unsigned long)sys_call_table[nr];
}
#endif
|
