73 lines
1.9 KiB
C
73 lines
1.9 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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#include <asm/ptrace.h>
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#include <linux/compiler.h>
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/*
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* The exception table consists of three addresses:
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*
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* - Address of an instruction that is allowed to fault.
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* - Address at which the program should continue.
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* - Optional address of handler that takes pt_regs * argument and runs in
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* interrupt context.
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*
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* No registers are modified, so it is entirely up to the continuation code
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* to figure out 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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short type, data;
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};
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extern struct exception_table_entry *__start_amode31_ex_table;
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extern struct exception_table_entry *__stop_amode31_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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static inline void swap_ex_entry_fixup(struct exception_table_entry *a,
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struct exception_table_entry *b,
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struct exception_table_entry tmp,
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int delta)
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{
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a->fixup = b->fixup + delta;
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b->fixup = tmp.fixup - delta;
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a->type = b->type;
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b->type = tmp.type;
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a->data = b->data;
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b->data = tmp.data;
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}
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#define swap_ex_entry_fixup swap_ex_entry_fixup
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#ifdef CONFIG_BPF_JIT
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bool ex_handler_bpf(const struct exception_table_entry *ex, struct pt_regs *regs);
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#else /* !CONFIG_BPF_JIT */
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static inline bool ex_handler_bpf(const struct exception_table_entry *ex, struct pt_regs *regs)
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{
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return false;
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}
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#endif /* CONFIG_BPF_JIT */
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bool fixup_exception(struct pt_regs *regs);
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#endif
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