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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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