Move source files to src/, add Makefile, fix all build and linkage errors, etc.
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TuxSH
253
exosphere/src/exceptions.s
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253
exosphere/src/exceptions.s
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/* Some macros taken from https://github.com/ARM-software/arm-trusted-firmware/blob/master/include/common/aarch64/asm_macros.S */
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/*
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* Copyright (c) 2013-2017, ARM Limited and Contributors. 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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/*
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* Declare the exception vector table, enforcing it is aligned on a
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* 2KB boundary, as required by the ARMv8 architecture.
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* Use zero bytes as the fill value to be stored in the padding bytes
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* so that it inserts illegal AArch64 instructions. This increases
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* security, robustness and potentially facilitates debugging.
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*/
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.macro vector_base label, section_name=.vectors
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.section \section_name, "ax"
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.align 11, 0
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\label:
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.endm
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/*
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* Create an entry in the exception vector table, enforcing it is
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* aligned on a 128-byte boundary, as required by the ARMv8 architecture.
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* Use zero bytes as the fill value to be stored in the padding bytes
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* so that it inserts illegal AArch64 instructions. This increases
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* security, robustness and potentially facilitates debugging.
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*/
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.macro vector_entry label, section_name=.vectors
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.cfi_sections .debug_frame
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.section \section_name, "ax"
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.align 7, 0
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.type \label, %function
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.func \label
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.cfi_startproc
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\label:
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.endm
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/*
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* This macro verifies that the given vector doesnt exceed the
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* architectural limit of 32 instructions. This is meant to be placed
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* immediately after the last instruction in the vector. It takes the
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* vector entry as the parameter
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*/
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.macro check_vector_size since
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.endfunc
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.cfi_endproc
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.if (. - \since) > (32 * 4)
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.error "Vector exceeds 32 instructions"
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.endif
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.endm
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/* Actual Vectors for Exosphere. */
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.global exosphere_vectors
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vector_base exosphere_vectors
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/* Current EL, SP0 */
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.global unknown_exception
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unknown_exception:
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vector_entry synch_sp0
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/* Panic with color FF7700, code 10. */
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mov x0, #0x10
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movk x0, #0x07F0,lsl#16
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b panic
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check_vector_size synch_sp0
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vector_entry irq_sp0
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b unknown_exception
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check_vector_size irq_sp0
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vector_entry fiq_sp0
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b unknown_exception
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check_vector_size fiq_sp0
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vector_entry serror_sp0
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b unknown_exception
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check_vector_size serror_sp0
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/* Current EL, SPx */
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vector_entry synch_spx
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b unknown_exception
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check_vector_size synch_spx
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vector_entry irq_spx
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b unknown_exception
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check_vector_size irq_spx
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vector_entry fiq_spx
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b unknown_exception
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check_vector_size fiq_spx
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vector_entry serror_spx
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b unknown_exception
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check_vector_size serror_spx
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/* Lower EL, A64 */
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vector_entry synch_a64
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stp x29, x30, [sp, #-0x10]!
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/* Verify SMC. */
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mrs x30, esr_el3
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lsr w29, w30, #0x1A
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cmp w29, #0x17
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ldp x29, x30, [sp],#0x10
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b.ne unknown_exception
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/* Call appropriate handler. */
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stp x29, x30, [sp, #-0x10]!
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mrs x29, mpidr_el1
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and x29, x29, #0x3
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cmp x29, #0x3
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b.ne handle_core012_smc_exception
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bl handle_core3_smc_exception
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ldp x29, x30, [sp],#0x10
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eret
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check_vector_size synch_a64
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vector_entry irq_a64
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b unknown_exception
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check_vector_size irq_a64
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vector_entry fiq_a64
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stp x29, x30, [sp, #-0x10]!
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mrs x29, mpidr_el1
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and x29, x29, #0x3
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cmp x29, #0x3
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b.ne unknown_exception
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stp x28, x29, [sp, #-0x10]!
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stp x26, x27, [sp, #-0x10]!
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bl handle_fiq_exception
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ldp x26, x27, [sp],#0x10
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ldp x28, x29, [sp],#0x10
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ldp x29, x30, [sp],#0x10
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eret
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check_vector_size fiq_a64
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vector_entry serror_a64
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b unknown_exception
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.endfunc
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.cfi_endproc
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/* To save space, insert in an unused vector segment. */
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.global handle_core012_smc_exception
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.type handle_core012_smc_exception, %function
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handle_core012_smc_exception:
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stp x6, x7, [sp, #-0x10]!
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stp x4, x5, [sp, #-0x10]!
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stp x2, x3, [sp, #-0x10]!
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stp x0, x1, [sp, #-0x10]!
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bl set_priv_smc_in_progress
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bl get_smc_core012_stack_address
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mov x29, x0
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ldp x0, x1, [sp],#0x10
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ldp x2, x3, [sp],#0x10
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ldp x4, x5, [sp],#0x10
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ldp x6, x7, [sp],#0x10
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mov x30, sp
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mov sp, x29
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stp x29, x30, [sp, #-0x10]!
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bl handle_core3_smc_exception
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ldp x29, x30, [sp],#0x10
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mov sp, x30
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stp x6, x7, [sp, #-0x10]!
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stp x4, x5, [sp, #-0x10]!
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stp x2, x3, [sp, #-0x10]!
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stp x0, x1, [sp, #-0x10]!
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bl clear_priv_smc_in_progress
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ldp x0, x1, [sp],#0x10
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ldp x2, x3, [sp],#0x10
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ldp x4, x5, [sp],#0x10
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ldp x6, x7, [sp],#0x10
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ldp x29, x30, [sp],#0x10
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eret
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/* Lower EL, A32 */
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vector_entry synch_a32
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b unknown_exception
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check_vector_size synch_a32
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vector_entry irq_a32
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b unknown_exception
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check_vector_size irq_a32
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vector_entry fiq_a32
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b fiq_a64
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.endfunc
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.cfi_endproc
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/* To save space, insert in an unused vector segment. */
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.global handle_fiq_exception
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.type handle_fiq_exception, %function
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handle_fiq_exception:
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stp x29, x30, [sp, #-0x10]!
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stp x24, x25, [sp, #-0x10]!
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stp x22, x23, [sp, #-0x10]!
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stp x20, x21, [sp, #-0x10]!
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stp x18, x19, [sp, #-0x10]!
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stp x16, x17, [sp, #-0x10]!
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stp x14, x15, [sp, #-0x10]!
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stp x12, x13, [sp, #-0x10]!
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stp x10, x11, [sp, #-0x10]!
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stp x8, x9, [sp, #-0x10]!
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stp x6, x7, [sp, #-0x10]!
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stp x4, x5, [sp, #-0x10]!
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stp x2, x3, [sp, #-0x10]!
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stp x0, x1, [sp, #-0x10]!
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bl handle_registered_interrupt
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ldp x0, x1, [sp],#0x10
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ldp x2, x3, [sp],#0x10
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ldp x4, x5, [sp],#0x10
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ldp x6, x7, [sp],#0x10
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ldp x8, x9, [sp],#0x10
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ldp x10, x11, [sp],#0x10
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ldp x12, x13, [sp],#0x10
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ldp x14, x15, [sp],#0x10
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ldp x16, x17, [sp],#0x10
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ldp x18, x19, [sp],#0x10
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ldp x20, x21, [sp],#0x10
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ldp x22, x23, [sp],#0x10
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ldp x24, x25, [sp],#0x10
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ldp x29, x30, [sp],#0x10
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ret
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vector_entry serror_a32
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b unknown_exception
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.endfunc
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.cfi_endproc
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/* To save space, insert in an unused vector segment. */
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.global handle_core3_smc_exception
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.type handle_core3_smc_exception, %function
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handle_core3_smc_exception:
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stp x29, x30, [sp, #-0x10]!
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stp x18, x19, [sp, #-0x10]!
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stp x16, x17, [sp, #-0x10]!
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stp x14, x15, [sp, #-0x10]!
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stp x12, x13, [sp, #-0x10]!
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stp x10, x11, [sp, #-0x10]!
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stp x8, x9, [sp, #-0x10]!
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stp x6, x7, [sp, #-0x10]!
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stp x4, x5, [sp, #-0x10]!
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stp x2, x3, [sp, #-0x10]!
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stp x0, x1, [sp, #-0x10]!
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mrs x0, esr_el3
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and x0, x0, #0xFFFF
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mov x1, sp
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bl call_smc_handler
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ldp x0, x1, [sp],#0x10
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ldp x2, x3, [sp],#0x10
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ldp x4, x5, [sp],#0x10
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ldp x6, x7, [sp],#0x10
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ldp x8, x9, [sp],#0x10
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ldp x10, x11, [sp],#0x10
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ldp x12, x13, [sp],#0x10
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ldp x14, x15, [sp],#0x10
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ldp x16, x17, [sp],#0x10
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ldp x18, x19, [sp],#0x10
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ret
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