Atmosphere/mesosphere/kernel/source/arch/arm64/exception_vectors.s

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Some macros taken from https://github.com/ARM-software/arm-trusted-firmware/blob/master/include/common/aarch64/asm_macros.S */
/*
* Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* Declare the exception vector table, enforcing it is aligned on a
* 2KB boundary, as required by the ARMv8 architecture.
* Use zero bytes as the fill value to be stored in the padding bytes
* so that it inserts illegal AArch64 instructions. This increases
* security, robustness and potentially facilitates debugging.
*/
.macro vector_base label, section_name=.vectors
.section \section_name, "ax"
.align 11, 0
\label:
.endm
/*
* Create an entry in the exception vector table, enforcing it is
* aligned on a 128-byte boundary, as required by the ARMv8 architecture.
* Use zero bytes as the fill value to be stored in the padding bytes
* so that it inserts illegal AArch64 instructions. This increases
* security, robustness and potentially facilitates debugging.
*/
.macro vector_entry label, section_name=.vectors
.cfi_sections .debug_frame
.section \section_name, "ax"
.align 7, 0
.type \label, %function
.func \label
.cfi_startproc
\label:
.endm
/*
* This macro verifies that the given vector doesnt exceed the
* architectural limit of 32 instructions. This is meant to be placed
* immediately after the last instruction in the vector. It takes the
* vector entry as the parameter
*/
.macro check_vector_size since
.endfunc
.cfi_endproc
.if (. - \since) > (32 * 4)
.error "Vector exceeds 32 instructions"
.endif
.endm
/* Actual Vectors for Kernel. */
.global _ZN3ams4kern16ExceptionVectorsEv
vector_base _ZN3ams4kern16ExceptionVectorsEv
/* Current EL, SP0 */
.global unknown_exception
unknown_exception:
vector_entry synch_sp0
/* Just infinite loop. */
b unknown_exception
check_vector_size synch_sp0
vector_entry irq_sp0
b unknown_exception
check_vector_size irq_sp0
vector_entry fiq_sp0
b unknown_exception
check_vector_size fiq_sp0
vector_entry serror_sp0
b unknown_exception
check_vector_size serror_sp0
/* Current EL, SPx */
vector_entry synch_spx
b unknown_exception
check_vector_size synch_spx
vector_entry irq_spx
b unknown_exception
check_vector_size irq_spx
vector_entry fiq_spx
b unknown_exception
check_vector_size fiq_spx
vector_entry serror_spx
b unknown_exception
check_vector_size serror_spx
/* Lower EL, A64 */
vector_entry synch_a64
b unknown_exception
check_vector_size synch_a64
vector_entry irq_a64
b unknown_exception
check_vector_size irq_a64
vector_entry fiq_a64
b unknown_exception
check_vector_size fiq_a64
vector_entry serror_a64
b unknown_exception
check_vector_size serror_a64
/* Lower EL, A32 */
vector_entry synch_a32
b unknown_exception
check_vector_size synch_a32
vector_entry irq_a32
b unknown_exception
check_vector_size irq_a32
vector_entry fiq_a32
b unknown_exception
check_vector_size fiq_a32
vector_entry serror_a32
b unknown_exception
check_vector_size serror_a32