mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-05 20:54:31 +00:00
66 lines
1.2 KiB
C
66 lines
1.2 KiB
C
// 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,
|
|
};
|