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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* efi_selftest_unaligned
*
* Copyright (c) 2018 Heinrich Schuchardt <xypron.glpk@gmx.de>
*
* Test unaligned memory access on ARMv7.
*/
#include <efi_selftest.h>
struct aligned_buffer {
char a[8] __aligned(8);
};
/*
* Return an u32 at a give address.
* If the address is not four byte aligned, an unaligned memory access
* occurs.
*
* @addr: address to read
* Return: value at the address
*/
static inline u32 deref(u32 *addr)
{
int ret;
asm(
"ldr %[out], [%[in]]\n\t"
: [out] "=r" (ret)
: [in] "r" (addr)
);
return ret;
}
/*
* Execute unit test.
* An unaligned memory access is executed. The result is checked.
*
* Return: EFI_ST_SUCCESS for success
*/
static int execute(void)
{
struct aligned_buffer buf = {
{0, 1, 2, 3, 4, 5, 6, 7},
};
void *v = &buf;
u32 r = 0;
/* Read an unaligned address */
r = deref(v + 1);
/* UEFI only supports low endian systems */
if (r != 0x04030201) {
efi_st_error("Unaligned access failed");
return EFI_ST_FAILURE;
}
return EFI_ST_SUCCESS;
}
EFI_UNIT_TEST(unaligned) = {
.name = "unaligned memory access",
.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
.execute = execute,
};
|
