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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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3126976be6
When we take an exception at EL1, we only want to enable debug exceptions if we're not currently stepping, otherwise we can easily get stuck in a loop stepping into interrupt handlers. Unfortunately, the current code tests the wrong bit in the mdscr, so fix that. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
118 lines
2.1 KiB
C
118 lines
2.1 KiB
C
/*
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* Based on arch/arm/include/asm/assembler.h
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*
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* Copyright (C) 1996-2000 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASSEMBLY__
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#error "Only include this from assembly code"
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#endif
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#include <asm/ptrace.h>
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/*
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* Stack pushing/popping (register pairs only). Equivalent to store decrement
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* before, load increment after.
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*/
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.macro push, xreg1, xreg2
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stp \xreg1, \xreg2, [sp, #-16]!
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.endm
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.macro pop, xreg1, xreg2
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ldp \xreg1, \xreg2, [sp], #16
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.endm
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/*
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* Enable and disable interrupts.
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*/
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.macro disable_irq
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msr daifset, #2
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.endm
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.macro enable_irq
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msr daifclr, #2
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.endm
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/*
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* Save/disable and restore interrupts.
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*/
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.macro save_and_disable_irqs, olddaif
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mrs \olddaif, daif
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disable_irq
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.endm
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.macro restore_irqs, olddaif
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msr daif, \olddaif
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.endm
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/*
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* Enable and disable debug exceptions.
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*/
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.macro disable_dbg
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msr daifset, #8
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.endm
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.macro enable_dbg
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msr daifclr, #8
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.endm
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.macro disable_step, tmp
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mrs \tmp, mdscr_el1
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bic \tmp, \tmp, #1
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msr mdscr_el1, \tmp
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.endm
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.macro enable_step, tmp
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mrs \tmp, mdscr_el1
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orr \tmp, \tmp, #1
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msr mdscr_el1, \tmp
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.endm
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.macro enable_dbg_if_not_stepping, tmp
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mrs \tmp, mdscr_el1
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tbnz \tmp, #0, 9990f
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enable_dbg
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9990:
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.endm
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/*
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* SMP data memory barrier
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*/
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.macro smp_dmb, opt
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#ifdef CONFIG_SMP
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dmb \opt
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#endif
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.endm
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#define USER(l, x...) \
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9999: x; \
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.section __ex_table,"a"; \
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.align 3; \
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.quad 9999b,l; \
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.previous
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/*
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* Register aliases.
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*/
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lr .req x30 // link register
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/*
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* Vector entry
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*/
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.macro ventry label
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.align 7
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b \label
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.endm
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