36 lines
858 B
C
36 lines
858 B
C
/*
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* linux/arch/x86_64/mm/extable.c
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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/* Simple binary search */
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const struct exception_table_entry *
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search_extable(const struct exception_table_entry *first,
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const struct exception_table_entry *last,
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unsigned long value)
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{
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/* Work around a B stepping K8 bug */
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if ((value >> 32) == 0)
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value |= 0xffffffffUL << 32;
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while (first <= last) {
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const struct exception_table_entry *mid;
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long diff;
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mid = (last - first) / 2 + first;
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diff = mid->insn - value;
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if (diff == 0)
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return mid;
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else if (diff < 0)
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first = mid+1;
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else
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last = mid-1;
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}
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return NULL;
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}
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