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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
45caf470 AV |
2 | #ifndef _ASM_X86_EXTABLE_H |
3 | #define _ASM_X86_EXTABLE_H | |
4 | /* | |
5 | * The exception table consists of triples of addresses relative to the | |
6 | * exception table entry itself. The first address is of an instruction | |
7 | * that is allowed to fault, the second is the target at which the program | |
8 | * should continue. The third is a handler function to deal with the fault | |
9 | * caused by the instruction in the first field. | |
10 | * | |
11 | * All the routines below use bits of fixup code that are out of line | |
12 | * with the main instruction path. This means when everything is well, | |
13 | * we don't even have to jump over them. Further, they do not intrude | |
14 | * on our cache or tlb entries. | |
15 | */ | |
16 | ||
17 | struct exception_table_entry { | |
18 | int insn, fixup, handler; | |
19 | }; | |
20 | struct pt_regs; | |
21 | ||
22 | #define ARCH_HAS_RELATIVE_EXTABLE | |
23 | ||
24 | #define swap_ex_entry_fixup(a, b, tmp, delta) \ | |
25 | do { \ | |
26 | (a)->fixup = (b)->fixup + (delta); \ | |
27 | (b)->fixup = (tmp).fixup - (delta); \ | |
28 | (a)->handler = (b)->handler + (delta); \ | |
29 | (b)->handler = (tmp).handler - (delta); \ | |
30 | } while (0) | |
31 | ||
32 | extern int fixup_exception(struct pt_regs *regs, int trapnr); | |
8a524f80 | 33 | extern int fixup_bug(struct pt_regs *regs, int trapnr); |
45caf470 AV |
34 | extern bool ex_has_fault_handler(unsigned long ip); |
35 | extern void early_fixup_exception(struct pt_regs *regs, int trapnr); | |
36 | ||
37 | #endif |