/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_EXTABLE_H
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#define _ASM_X86_EXTABLE_H
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/*
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* The exception table consists of triples of addresses relative to the
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* exception table entry itself. The first address is of an instruction
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* that is allowed to fault, the second is the target at which the program
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* should continue. The third is a handler function to deal with the fault
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* caused by the instruction in the first field.
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*
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* All the routines below use bits of fixup code that are out of line
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* with the main instruction path. This means when everything is well,
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* we don't even have to jump over them. Further, they do not intrude
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* on our cache or tlb entries.
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*/
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struct exception_table_entry {
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int insn, fixup, handler;
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};
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struct pt_regs;
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#define ARCH_HAS_RELATIVE_EXTABLE
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#define swap_ex_entry_fixup(a, b, tmp, delta) \
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do { \
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(a)->fixup = (b)->fixup + (delta); \
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(b)->fixup = (tmp).fixup - (delta); \
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(a)->handler = (b)->handler + (delta); \
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(b)->handler = (tmp).handler - (delta); \
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} while (0)
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enum handler_type {
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EX_HANDLER_NONE,
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EX_HANDLER_FAULT,
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EX_HANDLER_UACCESS,
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EX_HANDLER_OTHER
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};
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extern int fixup_exception(struct pt_regs *regs, int trapnr,
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unsigned long error_code, unsigned long fault_addr);
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extern int fixup_bug(struct pt_regs *regs, int trapnr);
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extern enum handler_type ex_get_fault_handler_type(unsigned long ip);
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extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
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#endif
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