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Linux/arch/ia64/mm/extable.c

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  1 /*
  2  * Kernel exception handling table support.  Derived from arch/alpha/mm/extable.c.
  3  *
  4  * Copyright (C) 1998, 1999, 2001-2002, 2004 Hewlett-Packard Co
  5  *      David Mosberger-Tang <davidm@hpl.hp.com>
  6  */
  7 
  8 #include <linux/sort.h>
  9 
 10 #include <asm/uaccess.h>
 11 #include <linux/module.h>
 12 
 13 static int cmp_ex(const void *a, const void *b)
 14 {
 15         const struct exception_table_entry *l = a, *r = b;
 16         u64 lip = (u64) &l->addr + l->addr;
 17         u64 rip = (u64) &r->addr + r->addr;
 18 
 19         /* avoid overflow */
 20         if (lip > rip)
 21                 return 1;
 22         if (lip < rip)
 23                 return -1;
 24         return 0;
 25 }
 26 
 27 static void swap_ex(void *a, void *b, int size)
 28 {
 29         struct exception_table_entry *l = a, *r = b, tmp;
 30         u64 delta = (u64) r - (u64) l;
 31 
 32         tmp = *l;
 33         l->addr = r->addr + delta;
 34         l->cont = r->cont + delta;
 35         r->addr = tmp.addr - delta;
 36         r->cont = tmp.cont - delta;
 37 }
 38 
 39 /*
 40  * Sort the exception table. It's usually already sorted, but there
 41  * may be unordered entries due to multiple text sections (such as the
 42  * .init text section). Note that the exception-table-entries contain
 43  * location-relative addresses, which requires a bit of care during
 44  * sorting to avoid overflows in the offset members (e.g., it would
 45  * not be safe to make a temporary copy of an exception-table entry on
 46  * the stack, because the stack may be more than 2GB away from the
 47  * exception-table).
 48  */
 49 void sort_extable (struct exception_table_entry *start,
 50                    struct exception_table_entry *finish)
 51 {
 52         sort(start, finish - start, sizeof(struct exception_table_entry),
 53              cmp_ex, swap_ex);
 54 }
 55 
 56 static inline unsigned long ex_to_addr(const struct exception_table_entry *x)
 57 {
 58         return (unsigned long)&x->addr + x->addr;
 59 }
 60 
 61 #ifdef CONFIG_MODULES
 62 /*
 63  * Any entry referring to the module init will be at the beginning or
 64  * the end.
 65  */
 66 void trim_init_extable(struct module *m)
 67 {
 68         /*trim the beginning*/
 69         while (m->num_exentries &&
 70                within_module_init(ex_to_addr(&m->extable[0]), m)) {
 71                 m->extable++;
 72                 m->num_exentries--;
 73         }
 74         /*trim the end*/
 75         while (m->num_exentries &&
 76                within_module_init(ex_to_addr(&m->extable[m->num_exentries-1]),
 77                                   m))
 78                 m->num_exentries--;
 79 }
 80 #endif /* CONFIG_MODULES */
 81 
 82 const struct exception_table_entry *
 83 search_extable (const struct exception_table_entry *first,
 84                 const struct exception_table_entry *last,
 85                 unsigned long ip)
 86 {
 87         const struct exception_table_entry *mid;
 88         unsigned long mid_ip;
 89         long diff;
 90 
 91         while (first <= last) {
 92                 mid = &first[(last - first)/2];
 93                 mid_ip = (u64) &mid->addr + mid->addr;
 94                 diff = mid_ip - ip;
 95                 if (diff == 0)
 96                         return mid;
 97                 else if (diff < 0)
 98                         first = mid + 1;
 99                 else
100                         last = mid - 1;
101         }
102         return NULL;
103 }
104 
105 void
106 ia64_handle_exception (struct pt_regs *regs, const struct exception_table_entry *e)
107 {
108         long fix = (u64) &e->cont + e->cont;
109 
110         regs->r8 = -EFAULT;
111         if (fix & 4)
112                 regs->r9 = 0;
113         regs->cr_iip = fix & ~0xf;
114         ia64_psr(regs)->ri = fix & 0x3;         /* set continuation slot number */
115 }
116 

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