1 // SPDX-License-Identifier: GPL-2.0+
3 * efi_selftest_unaligned
5 * Copyright (c) 2018 Heinrich Schuchardt <xypron.glpk@gmx.de>
7 * Test unaligned memory access on ARMv7.
10 #include <efi_selftest.h>
12 struct aligned_buffer {
13 char a[8] __aligned(8);
17 * Return an u32 at a give address.
18 * If the address is not four byte aligned, an unaligned memory access
21 * @addr: address to read
22 * @return: value at the address
24 static inline u32 deref(u32 *addr)
29 "ldr %[out], [%[in]]\n\t"
38 * An unaligned memory access is executed. The result is checked.
40 * @return: EFI_ST_SUCCESS for success
42 static int execute(void)
44 struct aligned_buffer buf = {
45 {0, 1, 2, 3, 4, 5, 6, 7},
50 /* Read an unaligned address */
53 /* UEFI only supports low endian systems */
54 if (r != 0x04030201) {
55 efi_st_error("Unaligned access failed");
56 return EFI_ST_FAILURE;
59 return EFI_ST_SUCCESS;
62 EFI_UNIT_TEST(unaligned) = {
63 .name = "unaligned memory access",
64 .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,