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/*
* Copyright (c) 2022, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <context.h>
#if WORKAROUND_CVE_2022_23960
/*
* This macro applies the mitigation for CVE-2022-23960.
* The macro saves x2 to the CPU context.
* SP should point to the CPU context.
*/
.macro apply_cve_2022_23960_bhb_wa _bhb_loop_count
str x2, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X2]
/* CVE-BHB-NUM loop count */
mov x2, \_bhb_loop_count
1:
/* b pc+4 part of the workaround */
b 2f
2:
subs x2, x2, #1
bne 1b
speculation_barrier
ldr x2, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X2]
.endm
#endif /* WORKAROUND_CVE_2022_23960 */
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