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