1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _ASM_X86_EXTABLE_H |
3 | #define _ASM_X86_EXTABLE_H |
4 | |
5 | #include <asm/extable_fixup_types.h> |
6 | |
7 | /* |
8 | * The exception table consists of two addresses relative to the |
9 | * exception table entry itself and a type selector field. |
10 | * |
11 | * The first address is of an instruction that is allowed to fault, the |
12 | * second is the target at which the program should continue. |
13 | * |
14 | * The type entry is used by fixup_exception() to select the handler to |
15 | * deal with the fault caused by the instruction in the first field. |
16 | * |
17 | * All the routines below use bits of fixup code that are out of line |
18 | * with the main instruction path. This means when everything is well, |
19 | * we don't even have to jump over them. Further, they do not intrude |
20 | * on our cache or tlb entries. |
21 | */ |
22 | |
23 | struct exception_table_entry { |
24 | int insn, fixup, data; |
25 | }; |
26 | struct pt_regs; |
27 | |
28 | #define ARCH_HAS_RELATIVE_EXTABLE |
29 | |
30 | #define swap_ex_entry_fixup(a, b, tmp, delta) \ |
31 | do { \ |
32 | (a)->fixup = (b)->fixup + (delta); \ |
33 | (b)->fixup = (tmp).fixup - (delta); \ |
34 | (a)->data = (b)->data; \ |
35 | (b)->data = (tmp).data; \ |
36 | } while (0) |
37 | |
38 | extern int fixup_exception(struct pt_regs *regs, int trapnr, |
39 | unsigned long error_code, unsigned long fault_addr); |
40 | extern int fixup_bug(struct pt_regs *regs, int trapnr); |
41 | extern int ex_get_fixup_type(unsigned long ip); |
42 | extern void early_fixup_exception(struct pt_regs *regs, int trapnr); |
43 | |
44 | #ifdef CONFIG_X86_MCE |
45 | extern void __noreturn ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr); |
46 | #else |
47 | static inline void __noreturn ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr) |
48 | { |
49 | for (;;) |
50 | cpu_relax(); |
51 | } |
52 | #endif |
53 | |
54 | #if defined(CONFIG_BPF_JIT) && defined(CONFIG_X86_64) |
55 | bool ex_handler_bpf(const struct exception_table_entry *x, struct pt_regs *regs); |
56 | #else |
57 | static inline bool ex_handler_bpf(const struct exception_table_entry *x, |
58 | struct pt_regs *regs) { return false; } |
59 | #endif |
60 | |
61 | #endif |
62 | |