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