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