35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __S390_EXTABLE_H
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#define __S390_EXTABLE_H
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/*
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* The exception table consists of pairs of addresses: the first is the
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* address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out
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* what to do.
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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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{
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int insn, fixup;
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};
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extern struct exception_table_entry *__start_dma_ex_table;
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extern struct exception_table_entry *__stop_dma_ex_table;
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const struct exception_table_entry *s390_search_extables(unsigned long addr);
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static inline unsigned long extable_fixup(const struct exception_table_entry *x)
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{
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return (unsigned long)&x->fixup + x->fixup;
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}
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#define ARCH_HAS_RELATIVE_EXTABLE
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#endif
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