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