/* * Derived from arch/ppc/mm/extable.c and arch/i386/mm/extable.c. * * Copyright (C) 2004 Paul Mackerras, IBM Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/module.h> #include <linux/init.h> #include <linux/sort.h> #include <asm/uaccess.h> #ifndef ARCH_HAS_SORT_EXTABLE /* * The exception table needs to be sorted so that the binary * search that we use to find entries in it works properly. * This is used both for the kernel exception table and for * the exception tables of modules that get loaded. */ static int cmp_ex(const void *a, const void *b) { const struct exception_table_entry *x = a, *y = b; /* avoid overflow */ if (x->insn > y->insn) return 1; if (x->insn < y->insn) return -1; return 0; } void sort_extable(struct exception_table_entry *start, struct exception_table_entry *finish) { sort(start, finish - start, sizeof(struct exception_table_entry), cmp_ex, NULL); } #ifdef CONFIG_MODULES /* * If the exception table is sorted, any referring to the module init * will be at the beginning or the end. */ void trim_init_extable(struct module *m) { /*trim the beginning*/ while (m->num_exentries && within_module_init(m->extable[0].insn, m)) { m->extable++; m->num_exentries--; } /*trim the end*/ while (m->num_exentries && within_module_init(m->extable[m->num_exentries-1].insn, m)) m->num_exentries--; } #endif /* CONFIG_MODULES */ #endif /* !ARCH_HAS_SORT_EXTABLE */ #ifndef ARCH_HAS_SEARCH_EXTABLE /* * Search one exception table for an entry corresponding to the * given instruction address, and return the address of the entry, * or NULL if none is found. * We use a binary search, and thus we assume that the table is * already sorted. */ const struct exception_table_entry * search_extable(const struct exception_table_entry *first, const struct exception_table_entry *last, unsigned long value) { while (first <= last) { const struct exception_table_entry *mid; mid = ((last - first) >> 1) + first; /* * careful, the distance between value and insn * can be larger than MAX_LONG: */ if (mid->insn < value) first = mid + 1; else if (mid->insn > value) last = mid - 1; else return mid; } return NULL; } #endif