/*
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* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2018 Philippe Gerum <rpm@xenomai.org>.
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*/
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#ifndef _ASM_ARM64_DOVETAIL_H
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#define _ASM_ARM64_DOVETAIL_H
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#include <asm/fpsimd.h>
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/* ARM64 traps */
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#define ARM64_TRAP_ACCESS 0 /* Data or instruction access exception */
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#define ARM64_TRAP_ALIGN 1 /* SP/PC alignment abort */
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#define ARM64_TRAP_SEA 2 /* Synchronous external abort */
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#define ARM64_TRAP_DEBUG 3 /* Debug trap */
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#define ARM64_TRAP_UNDI 4 /* Undefined instruction */
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#define ARM64_TRAP_UNDSE 5 /* Undefined synchronous exception */
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#define ARM64_TRAP_FPE 6 /* FPSIMD exception */
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#define ARM64_TRAP_SVE 7 /* SVE access trap */
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#define ARM64_TRAP_BTI 8 /* Branch target identification */
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#ifdef CONFIG_DOVETAIL
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static inline void arch_dovetail_exec_prepare(void)
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{ }
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static inline void arch_dovetail_switch_prepare(bool leave_inband)
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{ }
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static inline void arch_dovetail_switch_finish(bool enter_inband)
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{
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fpsimd_restore_current_oob();
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}
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/*
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* 172 is __NR_prctl from unistd32 in ARM32 mode, without #inclusion
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* hell. At the end of the day, this number is written in stone to
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* honor the ABI stability promise anyway.
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*/
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#define arch_dovetail_is_syscall(__nr) \
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(is_compat_task() ? (__nr) == 172 : (__nr) == __NR_prctl)
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#endif
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/*
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* Pass the trap event to the companion core. Return true if running
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* in-band afterwards.
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*/
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#define mark_cond_trap_entry(__trapnr, __regs) \
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({ \
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oob_trap_notify(__trapnr, __regs); \
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running_inband(); \
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})
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/*
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* Pass the trap event to the companion core. We expect the current
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* context to be running on the in-band stage upon return so that our
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* caller can tread on common kernel code.
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*/
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#define mark_trap_entry(__trapnr, __regs) \
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do { \
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bool __ret = mark_cond_trap_entry(__trapnr, __regs); \
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BUG_ON(dovetail_debug() && !__ret); \
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} while (0)
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#define mark_trap_exit(__trapnr, __regs) \
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oob_trap_unwind(__trapnr, __regs)
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#endif /* _ASM_ARM64_DOVETAIL_H */
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