1 #include <linux/module.h>
2 #include <asm/uaccess.h>
4 typedef bool (*ex_handler_t)(const struct exception_table_entry *,
5 struct pt_regs *, int);
7 static inline unsigned long
8 ex_fixup_addr(const struct exception_table_entry *x)
10 return (unsigned long)&x->fixup + x->fixup;
12 static inline ex_handler_t
13 ex_fixup_handler(const struct exception_table_entry *x)
15 return (ex_handler_t)((unsigned long)&x->handler + x->handler);
18 bool ex_handler_default(const struct exception_table_entry *fixup,
19 struct pt_regs *regs, int trapnr)
21 regs->ip = ex_fixup_addr(fixup);
24 EXPORT_SYMBOL(ex_handler_default);
26 bool ex_handler_fault(const struct exception_table_entry *fixup,
27 struct pt_regs *regs, int trapnr)
29 regs->ip = ex_fixup_addr(fixup);
33 EXPORT_SYMBOL_GPL(ex_handler_fault);
35 bool ex_handler_ext(const struct exception_table_entry *fixup,
36 struct pt_regs *regs, int trapnr)
38 /* Special hack for uaccess_err */
39 current_thread_info()->uaccess_err = 1;
40 regs->ip = ex_fixup_addr(fixup);
43 EXPORT_SYMBOL(ex_handler_ext);
45 bool ex_has_fault_handler(unsigned long ip)
47 const struct exception_table_entry *e;
50 e = search_exception_tables(ip);
53 handler = ex_fixup_handler(e);
55 return handler == ex_handler_fault;
58 int fixup_exception(struct pt_regs *regs, int trapnr)
60 const struct exception_table_entry *e;
64 if (unlikely(SEGMENT_IS_PNP_CODE(regs->cs))) {
65 extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp;
66 extern u32 pnp_bios_is_utter_crap;
67 pnp_bios_is_utter_crap = 1;
68 printk(KERN_CRIT "PNPBIOS fault.. attempting recovery.\n");
72 : : "g" (pnp_bios_fault_esp), "g" (pnp_bios_fault_eip));
73 panic("do_trap: can't hit this");
77 e = search_exception_tables(regs->ip);
81 handler = ex_fixup_handler(e);
82 return handler(e, regs, trapnr);
85 /* Restricted version used during very early boot */
86 int __init early_fixup_exception(unsigned long *ip)
88 const struct exception_table_entry *e;
92 e = search_exception_tables(*ip);
96 new_ip = ex_fixup_addr(e);
97 handler = ex_fixup_handler(e);
99 /* special handling not supported during early boot */
100 if (handler != ex_handler_default)