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
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <asm/efi.h>
#include <asm/string.h>
#include "efistub.h"
#ifdef CONFIG_KASAN
#undef memcpy
#undef memmove
#undef memset
void *__memcpy(void *__dest, const void *__src, size_t __n) __alias(memcpy);
void *__memmove(void *__dest, const void *__src, size_t count) __alias(memmove);
void *__memset(void *s, int c, size_t count) __alias(memset);
#endif
static void *efistub_memmove(u8 *dst, const u8 *src, size_t len)
{
if (src > dst || dst >= (src + len))
for (size_t i = 0; i < len; i++)
dst[i] = src[i];
else
for (ssize_t i = len - 1; i >= 0; i--)
dst[i] = src[i];
return dst;
}
static void *efistub_memset(void *dst, int c, size_t len)
{
for (u8 *d = dst; len--; d++)
*d = c;
return dst;
}
void *memcpy(void *dst, const void *src, size_t len)
{
if (efi_table_attr(efi_system_table, boottime) == NULL)
return efistub_memmove(dst, src, len);
efi_bs_call(copy_mem, dst, src, len);
return dst;
}
extern void *memmove(void *dst, const void *src, size_t len) __alias(memcpy);
void *memset(void *dst, int c, size_t len)
{
if (efi_table_attr(efi_system_table, boottime) == NULL)
return efistub_memset(dst, c, len);
efi_bs_call(set_mem, dst, len, c & U8_MAX);
return dst;
}
/**
* memcmp - Compare two areas of memory
* @cs: One area of memory
* @ct: Another area of memory
* @count: The size of the area.
*/
#undef memcmp
int memcmp(const void *cs, const void *ct, size_t count)
{
const unsigned char *su1, *su2;
int res = 0;
for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
if ((res = *su1 - *su2) != 0)
break;
return res;
}
|
