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
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