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48 lines
1.3 KiB
48 lines
1.3 KiB
3 years ago
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_EXTABLE_H
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#define __ASM_EXTABLE_H
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/*
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* The exception table consists of pairs of relative offsets: the first
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* is the relative offset to an instruction that is allowed to fault,
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* and the second is the relative offset at which the program should
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* continue. No registers are modified, so it is entirely up to the
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* continuation code to figure out what to do.
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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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{
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int insn, fixup;
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};
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#define ARCH_HAS_RELATIVE_EXTABLE
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static inline bool in_bpf_jit(struct pt_regs *regs)
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{
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if (!IS_ENABLED(CONFIG_BPF_JIT))
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return false;
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return regs->pc >= BPF_JIT_REGION_START &&
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regs->pc < BPF_JIT_REGION_END;
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}
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#ifdef CONFIG_BPF_JIT
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int arm64_bpf_fixup_exception(const struct exception_table_entry *ex,
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struct pt_regs *regs);
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#else /* !CONFIG_BPF_JIT */
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static inline
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int arm64_bpf_fixup_exception(const struct exception_table_entry *ex,
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struct pt_regs *regs)
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{
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return 0;
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}
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#endif /* !CONFIG_BPF_JIT */
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extern int fixup_exception(struct pt_regs *regs);
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#endif
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