| /* |
| * Copyright (c) 2019, Arm Limited. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <lib/el3_runtime/cpu_data.h> |
| |
| .global pauth_init_enable_el1 |
| .global pauth_disable_el1 |
| .global pauth_init_enable_el3 |
| .global pauth_disable_el3 |
| .globl pauth_load_bl31_apiakey |
| |
| /* ------------------------------------------------------------- |
| * Program APIAKey_EL1 and enable pointer authentication in EL1 |
| * ------------------------------------------------------------- |
| */ |
| func pauth_init_enable_el1 |
| stp x29, x30, [sp, #-16]! |
| |
| /* Initialize platform key */ |
| bl plat_init_apkey |
| |
| /* Program instruction key A used by the Trusted Firmware */ |
| msr APIAKeyLo_EL1, x0 |
| msr APIAKeyHi_EL1, x1 |
| |
| /* Enable pointer authentication */ |
| mrs x0, sctlr_el1 |
| orr x0, x0, #SCTLR_EnIA_BIT |
| |
| #if ENABLE_BTI |
| /* Enable PAC branch type compatibility */ |
| bic x0, x0, #(SCTLR_BT0_BIT | SCTLR_BT1_BIT) |
| #endif |
| msr sctlr_el1, x0 |
| isb |
| |
| ldp x29, x30, [sp], #16 |
| ret |
| endfunc pauth_init_enable_el1 |
| |
| /* ------------------------------------------------------------- |
| * Disable pointer authentication in EL3 |
| * ------------------------------------------------------------- |
| */ |
| func pauth_disable_el1 |
| mrs x0, sctlr_el1 |
| bic x0, x0, #SCTLR_EnIA_BIT |
| msr sctlr_el1, x0 |
| isb |
| ret |
| endfunc pauth_disable_el1 |
| |
| /* ------------------------------------------------------------- |
| * Program APIAKey_EL1 and enable pointer authentication in EL3 |
| * ------------------------------------------------------------- |
| */ |
| func pauth_init_enable_el3 |
| stp x29, x30, [sp, #-16]! |
| |
| /* Initialize platform key */ |
| bl plat_init_apkey |
| |
| /* Program instruction key A used by the Trusted Firmware */ |
| msr APIAKeyLo_EL1, x0 |
| msr APIAKeyHi_EL1, x1 |
| |
| /* Enable pointer authentication */ |
| mrs x0, sctlr_el3 |
| orr x0, x0, #SCTLR_EnIA_BIT |
| |
| #if ENABLE_BTI |
| /* Enable PAC branch type compatibility */ |
| bic x0, x0, #SCTLR_BT_BIT |
| #endif |
| msr sctlr_el3, x0 |
| isb |
| |
| ldp x29, x30, [sp], #16 |
| ret |
| endfunc pauth_init_enable_el3 |
| |
| /* ------------------------------------------------------------- |
| * Disable pointer authentication in EL3 |
| * ------------------------------------------------------------- |
| */ |
| func pauth_disable_el3 |
| mrs x0, sctlr_el3 |
| bic x0, x0, #SCTLR_EnIA_BIT |
| msr sctlr_el3, x0 |
| isb |
| ret |
| endfunc pauth_disable_el3 |
| |
| /* ------------------------------------------------------------- |
| * The following function strictly follows the AArch64 PCS |
| * to use x9-x17 (temporary caller-saved registers) to load |
| * the APIAKey_EL1 used by the firmware. |
| * ------------------------------------------------------------- |
| */ |
| func pauth_load_bl31_apiakey |
| /* tpidr_el3 contains the address of cpu_data structure */ |
| mrs x9, tpidr_el3 |
| |
| /* Load apiakey from cpu_data */ |
| ldp x10, x11, [x9, #CPU_DATA_APIAKEY_OFFSET] |
| |
| /* Program instruction key A */ |
| msr APIAKeyLo_EL1, x10 |
| msr APIAKeyHi_EL1, x11 |
| isb |
| ret |
| endfunc pauth_load_bl31_apiakey |
