release/src-rt-6.x/linux/linux-2.6/arch/i386/mm/extable.c

   1 /*
   2  * linux/arch/i386/mm/extable.c
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/spinlock.h>
   7 #include <asm/uaccess.h>
   8
   9 int fixup_exception(struct pt_regs *regs)
  10 {
  11         const struct exception_table_entry *fixup;
  12
  13 #ifdef CONFIG_PNPBIOS
  14         if (unlikely(SEGMENT_IS_PNP_CODE(regs->xcs)))
  15         {
  16                 extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp;
  17                 extern u32 pnp_bios_is_utter_crap;
  18                 pnp_bios_is_utter_crap = 1;
  19                 printk(KERN_CRIT "PNPBIOS fault.. attempting recovery.\n");
  20                 __asm__ volatile(
  21                         "movl %0, %%esp\n\t"
  22                         "jmp *%1\n\t"
  23                         : : "g" (pnp_bios_fault_esp), "g" (pnp_bios_fault_eip));
  24                 panic("do_trap: can't hit this");
  25         }
  26 #endif
  27
  28         fixup = search_exception_tables(regs->eip);
  29         if (fixup) {
  30                 regs->eip = fixup->fixup;
  31                 return 1;
  32         }
  33
  34         return 0;
  35 }