28 lines
572 B
C
28 lines
572 B
C
/*
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* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch_helpers.h>
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#include <common/debug.h>
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#include <lib/utils.h>
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#include <plat/common/plat_trng.h>
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#include <platform_def.h>
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u_register_t plat_get_stack_protector_canary(void)
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{
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uint64_t entropy;
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if (!plat_get_entropy(&entropy)) {
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ERROR("Not enough entropy to initialize canary value\n");
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panic();
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}
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if (sizeof(entropy) == sizeof(u_register_t)) {
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return entropy;
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}
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return (entropy & 0xffffffffULL) ^ (entropy >> 32);
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}
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