5437344c2b
This file was using module.h for search_exception_table. We've now separated that content out into its own file "extable.h" so now move over to that. Unlike most other instances, we can't delete the module.h include here since the file needs that for the within_module_init definition. Reported-by: kbuild test robot <lkp@intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: sparclinux@vger.kernel.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
/*
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* linux/arch/sparc/mm/extable.c
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*/
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#include <linux/module.h>
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#include <linux/extable.h>
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#include <linux/uaccess.h>
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void sort_extable(struct exception_table_entry *start,
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struct exception_table_entry *finish)
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{
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}
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/* Caller knows they are in a range if ret->fixup == 0 */
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const struct exception_table_entry *
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search_extable(const struct exception_table_entry *start,
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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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const struct exception_table_entry *walk;
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/* Single insn entries are encoded as:
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* word 1: insn address
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* word 2: fixup code address
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*
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* Range entries are encoded as:
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* word 1: first insn address
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* word 2: 0
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* word 3: last insn address + 4 bytes
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* word 4: fixup code address
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*
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* Deleted entries are encoded as:
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* word 1: unused
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* word 2: -1
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*
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* See asm/uaccess.h for more details.
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*/
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/* 1. Try to find an exact match. */
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for (walk = start; walk <= last; walk++) {
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if (walk->fixup == 0) {
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/* A range entry, skip both parts. */
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walk++;
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continue;
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}
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/* A deleted entry; see trim_init_extable */
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if (walk->fixup == -1)
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continue;
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if (walk->insn == value)
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return walk;
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}
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/* 2. Try to find a range match. */
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for (walk = start; walk <= (last - 1); walk++) {
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if (walk->fixup)
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continue;
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if (walk[0].insn <= value && walk[1].insn > value)
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return walk;
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walk++;
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}
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return NULL;
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}
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#ifdef CONFIG_MODULES
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/* We could memmove them around; easier to mark the trimmed ones. */
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void trim_init_extable(struct module *m)
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{
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unsigned int i;
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bool range;
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for (i = 0; i < m->num_exentries; i += range ? 2 : 1) {
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range = m->extable[i].fixup == 0;
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if (within_module_init(m->extable[i].insn, m)) {
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m->extable[i].fixup = -1;
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if (range)
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m->extable[i+1].fixup = -1;
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}
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if (range)
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i++;
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}
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}
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#endif /* CONFIG_MODULES */
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/* Special extable search, which handles ranges. Returns fixup */
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unsigned long search_extables_range(unsigned long addr, unsigned long *g2)
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{
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const struct exception_table_entry *entry;
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entry = search_exception_tables(addr);
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if (!entry)
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return 0;
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/* Inside range? Fix g2 and return correct fixup */
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if (!entry->fixup) {
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*g2 = (addr - entry->insn) / 4;
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return (entry + 1)->fixup;
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}
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return entry->fixup;
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}
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