44 lines
860 B
C
44 lines
860 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Based on arch/arm/mm/extable.c
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*/
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#include <linux/extable.h>
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#include <linux/uaccess.h>
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#include <asm/asm-extable.h>
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typedef bool (*ex_handler_t)(const struct exception_table_entry *,
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struct pt_regs *);
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static inline unsigned long
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get_ex_fixup(const struct exception_table_entry *ex)
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{
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return ((unsigned long)&ex->fixup + ex->fixup);
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}
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static bool ex_handler_fixup(const struct exception_table_entry *ex,
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struct pt_regs *regs)
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{
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regs->pc = get_ex_fixup(ex);
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return true;
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}
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bool fixup_exception(struct pt_regs *regs)
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{
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const struct exception_table_entry *ex;
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ex = search_exception_tables(instruction_pointer(regs));
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if (!ex)
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return false;
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switch (ex->type) {
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case EX_TYPE_FIXUP:
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return ex_handler_fixup(ex, regs);
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case EX_TYPE_BPF:
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return ex_handler_bpf(ex, regs);
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}
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BUG();
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}
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