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142 lines
3.4 KiB
142 lines
3.4 KiB
/*
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* Copyright (c) 2019, Arm Limited. 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.h>
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#include <asm_macros.S>
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#include <lib/el3_runtime/cpu_data.h>
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.global pauth_init_enable_el1
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.global pauth_disable_el1
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.global pauth_init_enable_el3
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.global pauth_disable_el3
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.globl pauth_load_bl31_apiakey
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.globl pauth_load_bl1_apiakey_enable
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/* -------------------------------------------------------------
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* Program APIAKey_EL1 and enable pointer authentication in EL1
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* -------------------------------------------------------------
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*/
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func pauth_init_enable_el1
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stp x29, x30, [sp, #-16]!
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/* Initialize platform key */
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bl plat_init_apkey
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/* Program instruction key A used by the Trusted Firmware */
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msr APIAKeyLo_EL1, x0
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msr APIAKeyHi_EL1, x1
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/* Enable pointer authentication */
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mrs x0, sctlr_el1
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orr x0, x0, #SCTLR_EnIA_BIT
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#if ENABLE_BTI
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/* Enable PAC branch type compatibility */
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bic x0, x0, #(SCTLR_BT0_BIT | SCTLR_BT1_BIT)
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#endif
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msr sctlr_el1, x0
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isb
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ldp x29, x30, [sp], #16
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ret
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endfunc pauth_init_enable_el1
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/* -------------------------------------------------------------
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* Disable pointer authentication in EL3
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* -------------------------------------------------------------
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*/
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func pauth_disable_el1
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mrs x0, sctlr_el1
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bic x0, x0, #SCTLR_EnIA_BIT
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msr sctlr_el1, x0
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isb
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ret
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endfunc pauth_disable_el1
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/* -------------------------------------------------------------
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* Program APIAKey_EL1 and enable pointer authentication in EL3
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* -------------------------------------------------------------
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*/
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func pauth_init_enable_el3
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stp x29, x30, [sp, #-16]!
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/* Initialize platform key */
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bl plat_init_apkey
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/* Program instruction key A used by the Trusted Firmware */
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msr APIAKeyLo_EL1, x0
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msr APIAKeyHi_EL1, x1
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/* Enable pointer authentication */
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mrs x0, sctlr_el3
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orr x0, x0, #SCTLR_EnIA_BIT
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#if ENABLE_BTI
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/* Enable PAC branch type compatibility */
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bic x0, x0, #SCTLR_BT_BIT
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#endif
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msr sctlr_el3, x0
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isb
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ldp x29, x30, [sp], #16
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ret
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endfunc pauth_init_enable_el3
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/* -------------------------------------------------------------
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* Disable pointer authentication in EL3
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* -------------------------------------------------------------
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*/
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func pauth_disable_el3
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mrs x0, sctlr_el3
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bic x0, x0, #SCTLR_EnIA_BIT
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msr sctlr_el3, x0
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isb
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ret
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endfunc pauth_disable_el3
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/* -------------------------------------------------------------
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* The following functions strictly follow the AArch64 PCS
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* to use x9-x17 (temporary caller-saved registers) to load
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* the APIAKey_EL1 and enable pointer authentication.
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* -------------------------------------------------------------
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*/
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func pauth_load_bl31_apiakey
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/* tpidr_el3 contains the address of cpu_data structure */
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mrs x9, tpidr_el3
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/* Load apiakey from cpu_data */
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ldp x10, x11, [x9, #CPU_DATA_APIAKEY_OFFSET]
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/* Program instruction key A */
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msr APIAKeyLo_EL1, x10
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msr APIAKeyHi_EL1, x11
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isb
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ret
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endfunc pauth_load_bl31_apiakey
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func pauth_load_bl1_apiakey_enable
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/* Load instruction key A used by the Trusted Firmware */
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adrp x9, bl1_apiakey
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add x9, x9, :lo12:bl1_apiakey
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ldp x10, x11, [x9]
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/* Program instruction key A */
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msr APIAKeyLo_EL1, x10
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msr APIAKeyHi_EL1, x11
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/* Enable pointer authentication */
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mrs x9, sctlr_el3
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orr x9, x9, #SCTLR_EnIA_BIT
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#if ENABLE_BTI
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/* Enable PAC branch type compatibility */
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bic x9, x9, #SCTLR_BT_BIT
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#endif
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msr sctlr_el3, x9
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isb
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ret
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endfunc pauth_load_bl1_apiakey_enable
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