| /* |
| * 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 */ |