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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_EXTABLE_H
#define __ASM_EXTABLE_H
/*
* The exception table consists of pairs of relative offsets: the first
* is the relative offset to an instruction that is allowed to fault,
* and the second is the relative offset at which the program should
* continue. No registers are modified, so it is entirely up to the
* continuation code to figure out what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry
{
int insn, fixup;
short type, data;
};
#define ARCH_HAS_RELATIVE_EXTABLE
#define swap_ex_entry_fixup(a, b, tmp, delta) \
do { \
(a)->fixup = (b)->fixup + (delta); \
(b)->fixup = (tmp).fixup - (delta); \
(a)->type = (b)->type; \
(b)->type = (tmp).type; \
(a)->data = (b)->data; \
(b)->data = (tmp).data; \
} while (0)
#ifdef CONFIG_BPF_JIT
bool ex_handler_bpf(const struct exception_table_entry *ex,
struct pt_regs *regs);
#else /* !CONFIG_BPF_JIT */
static inline
bool ex_handler_bpf(const struct exception_table_entry *ex,
struct pt_regs *regs)
{
return false;
}
#endif /* !CONFIG_BPF_JIT */
bool fixup_exception(struct pt_regs *regs);
#endif
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