58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef _ASM_X86_EXTABLE_H
|
||
|
|
#define _ASM_X86_EXTABLE_H
|
||
|
|
|
||
|
|
#include <asm/extable_fixup_types.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The exception table consists of two addresses relative to the
|
||
|
|
* exception table entry itself and a type selector field.
|
||
|
|
*
|
||
|
|
* The first address is of an instruction that is allowed to fault, the
|
||
|
|
* second is the target at which the program should continue.
|
||
|
|
*
|
||
|
|
* The type entry is used by fixup_exception() to select the handler to
|
||
|
|
* deal with the fault caused by the instruction in the first field.
|
||
|
|
*
|
||
|
|
* All the routines below use bits of fixup code that are out of line
|
||
|
|
* with the main instruction path. This means when everything is well,
|
||
|
|
* we don't even have to jump over them. Further, they do not intrude
|
||
|
|
* on our cache or tlb entries.
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct exception_table_entry {
|
||
|
|
int insn, fixup, data;
|
||
|
|
};
|
||
|
|
struct pt_regs;
|
||
|
|
|
||
|
|
#define ARCH_HAS_RELATIVE_EXTABLE
|
||
|
|
|
||
|
|
#define swap_ex_entry_fixup(a, b, tmp, delta) \
|
||
|
|
do { \
|
||
|
|
(a)->fixup = (b)->fixup + (delta); \
|
||
|
|
(b)->fixup = (tmp).fixup - (delta); \
|
||
|
|
(a)->data = (b)->data; \
|
||
|
|
(b)->data = (tmp).data; \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
extern int fixup_exception(struct pt_regs *regs, int trapnr,
|
||
|
|
unsigned long error_code, unsigned long fault_addr);
|
||
|
|
extern int fixup_bug(struct pt_regs *regs, int trapnr);
|
||
|
|
extern int ex_get_fixup_type(unsigned long ip);
|
||
|
|
extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
|
||
|
|
|
||
|
|
#ifdef CONFIG_X86_MCE
|
||
|
|
extern void ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr);
|
||
|
|
#else
|
||
|
|
static inline void ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr) { }
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(CONFIG_BPF_JIT) && defined(CONFIG_X86_64)
|
||
|
|
bool ex_handler_bpf(const struct exception_table_entry *x, struct pt_regs *regs);
|
||
|
|
#else
|
||
|
|
static inline bool ex_handler_bpf(const struct exception_table_entry *x,
|
||
|
|
struct pt_regs *regs) { return false; }
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|