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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef __ASM_EXTABLE_H |
| 3 | #define __ASM_EXTABLE_H |
| 4 | |
| 5 | /* |
| 6 | * The exception table consists of pairs of relative offsets: the first |
| 7 | * is the relative offset to an instruction that is allowed to fault, |
| 8 | * and the second is the relative offset at which the program should |
| 9 | * continue. No registers are modified, so it is entirely up to the |
| 10 | * continuation code to figure out what to do. |
| 11 | * |
| 12 | * All the routines below use bits of fixup code that are out of line |
| 13 | * with the main instruction path. This means when everything is well, |
| 14 | * we don't even have to jump over them. Further, they do not intrude |
| 15 | * on our cache or tlb entries. |
| 16 | */ |
| 17 | |
| 18 | struct exception_table_entry |
| 19 | { |
| 20 | int insn, fixup; |
| 21 | short type, data; |
| 22 | }; |
| 23 | |
| 24 | #define ARCH_HAS_RELATIVE_EXTABLE |
| 25 | |
| 26 | #define swap_ex_entry_fixup(a, b, tmp, delta) \ |
| 27 | do { \ |
| 28 | (a)->fixup = (b)->fixup + (delta); \ |
| 29 | (b)->fixup = (tmp).fixup - (delta); \ |
| 30 | (a)->type = (b)->type; \ |
| 31 | (b)->type = (tmp).type; \ |
| 32 | (a)->data = (b)->data; \ |
| 33 | (b)->data = (tmp).data; \ |
| 34 | } while (0) |
| 35 | |
| 36 | bool insn_may_access_user(unsigned long addr, unsigned long esr); |
| 37 | |
| 38 | #ifdef CONFIG_BPF_JIT |
| 39 | bool ex_handler_bpf(const struct exception_table_entry *ex, |
| 40 | struct pt_regs *regs); |
| 41 | #else /* !CONFIG_BPF_JIT */ |
| 42 | static inline |
| 43 | bool ex_handler_bpf(const struct exception_table_entry *ex, |
| 44 | struct pt_regs *regs) |
| 45 | { |
| 46 | return false; |
| 47 | } |
| 48 | #endif /* !CONFIG_BPF_JIT */ |
| 49 | |
| 50 | bool fixup_exception(struct pt_regs *regs, unsigned long esr); |
| 51 | #endif |
| 52 |
Warning: This file is not a C or C++ file. It does not have highlighting.