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https://github.com/brain-hackers/u-boot-brain
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4c2cc7c4e9
Our current arm64 exception handlers all panic and never return to the exception triggering code. But if any handler wanted to continue execution after fixups, it would need help from the exception handling code to restore all registers. This patch implements that help. With this code, exception handlers on aarch64 can successfully return to the place the exception happened (or somewhere else if they modify elr). Signed-off-by: Alexander Graf <agraf@suse.de>
147 lines
2.4 KiB
ArmAsm
147 lines
2.4 KiB
ArmAsm
/*
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* (C) Copyright 2013
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* David Feng <fenghua@phytium.com.cn>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <asm/ptrace.h>
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#include <asm/macro.h>
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#include <linux/linkage.h>
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/*
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* Enter Exception.
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* This will save the processor state that is ELR/X0~X30
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* to the stack frame.
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*/
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.macro exception_entry
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stp x29, x30, [sp, #-16]!
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stp x27, x28, [sp, #-16]!
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stp x25, x26, [sp, #-16]!
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stp x23, x24, [sp, #-16]!
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stp x21, x22, [sp, #-16]!
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stp x19, x20, [sp, #-16]!
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stp x17, x18, [sp, #-16]!
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stp x15, x16, [sp, #-16]!
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stp x13, x14, [sp, #-16]!
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stp x11, x12, [sp, #-16]!
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stp x9, x10, [sp, #-16]!
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stp x7, x8, [sp, #-16]!
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stp x5, x6, [sp, #-16]!
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stp x3, x4, [sp, #-16]!
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stp x1, x2, [sp, #-16]!
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/* Could be running at EL3/EL2/EL1 */
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switch_el x11, 3f, 2f, 1f
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3: mrs x1, esr_el3
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mrs x2, elr_el3
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b 0f
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2: mrs x1, esr_el2
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mrs x2, elr_el2
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b 0f
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1: mrs x1, esr_el1
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mrs x2, elr_el1
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0:
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stp x2, x0, [sp, #-16]!
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mov x0, sp
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.endm
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/*
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* Exception vectors.
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*/
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.align 11
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.globl vectors
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vectors:
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.align 7
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b _do_bad_sync /* Current EL Synchronous Thread */
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.align 7
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b _do_bad_irq /* Current EL IRQ Thread */
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.align 7
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b _do_bad_fiq /* Current EL FIQ Thread */
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.align 7
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b _do_bad_error /* Current EL Error Thread */
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.align 7
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b _do_sync /* Current EL Synchronous Handler */
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.align 7
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b _do_irq /* Current EL IRQ Handler */
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.align 7
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b _do_fiq /* Current EL FIQ Handler */
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.align 7
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b _do_error /* Current EL Error Handler */
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_do_bad_sync:
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exception_entry
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bl do_bad_sync
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b exception_exit
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_do_bad_irq:
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exception_entry
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bl do_bad_irq
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b exception_exit
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_do_bad_fiq:
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exception_entry
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bl do_bad_fiq
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b exception_exit
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_do_bad_error:
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exception_entry
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bl do_bad_error
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b exception_exit
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_do_sync:
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exception_entry
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bl do_sync
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b exception_exit
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_do_irq:
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exception_entry
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bl do_irq
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b exception_exit
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_do_fiq:
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exception_entry
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bl do_fiq
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b exception_exit
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_do_error:
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exception_entry
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bl do_error
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b exception_exit
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exception_exit:
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ldp x2, x0, [sp],#16
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switch_el x11, 3f, 2f, 1f
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3: msr elr_el3, x2
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b 0f
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2: msr elr_el2, x2
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b 0f
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1: msr elr_el1, x2
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0:
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ldp x1, x2, [sp],#16
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ldp x3, x4, [sp],#16
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ldp x5, x6, [sp],#16
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ldp x7, x8, [sp],#16
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ldp x9, x10, [sp],#16
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ldp x11, x12, [sp],#16
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ldp x13, x14, [sp],#16
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ldp x15, x16, [sp],#16
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ldp x17, x18, [sp],#16
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ldp x19, x20, [sp],#16
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ldp x21, x22, [sp],#16
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ldp x23, x24, [sp],#16
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ldp x25, x26, [sp],#16
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ldp x27, x28, [sp],#16
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ldp x29, x30, [sp],#16
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eret
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