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
16struct exception_table_entry {
17	int insn, fixup, handler;
18};
19struct 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
31extern int fixup_exception(struct pt_regs *regs, int trapnr);
32extern bool ex_has_fault_handler(unsigned long ip);
 
 
33extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
34
35#endif

 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
23struct exception_table_entry {
24	int insn, fixup, data;
25};
26struct 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
38extern int fixup_exception(struct pt_regs *regs, int trapnr,
39			   unsigned long error_code, unsigned long fault_addr);
40extern int fixup_bug(struct pt_regs *regs, int trapnr);
41extern int ex_get_fixup_type(unsigned long ip);
42extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
43
44#ifdef CONFIG_X86_MCE
45extern void __noreturn ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr);
46#else
47static 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)
55bool ex_handler_bpf(const struct exception_table_entry *x, struct pt_regs *regs);
56#else
57static inline bool ex_handler_bpf(const struct exception_table_entry *x,
58				  struct pt_regs *regs) { return false; }
59#endif
60
61#endif